Description The present invention relates to a luminaire, preferably emergency luminaire, with an indicator and an antenna as well as to a lighting system comprising at least such a luminaire.

A luminaire, such as an emergency luminaire, with one or more lighting means for light emission may comprise an indicator comprising one or more indicator lighting means for indicating by light emission information, such as the status of the luminaire, to the outside of the luminaire. Therefore, the indicator of the luminaire is arranged such that its light emission is visible to the outside of the housing of the luminaire and, thus, to the outside of the luminaire. An emergency luminaire is a luminaire configured to emit light in an emergency case, such as mains failure, from an electrical energy storage, such as a battery. The energy storage, e.g. battery, may be rechargeable.

In case the luminaire is an emergency luminaire, such an indicator may be mandatory in order to inform a user about the functionality of the emergency luminaire via the indicator, in particular via the light emission by the indicator.

Often, it is preferred that the luminaire is configured for a wireless communication using an antenna for transmitting and receiving electromagnetic waves. In case, the luminaire comprises such an antenna within its housing, which is usually made of material preventing or damping electromagnetic waves, such as metals, the antenna may be shielded by the housing and, thus, the wireless communication by the antenna may be disturbed or even not be possible. Providing an opening in the housing at the place (location) of the antenna for overcoming the problem of the antenna shielded by the housing has the disadvantage of reducing the protection offered by the housing against ingress of solid objects, such as dust, ingress of liquids, such as water, and accidental contact. This protection is classified by the IP code (also referred to as “International Protection Rating’’ or “Ingress Protection Rating’’) and may be referred to as IP protection. In particular, the IP protection is classified respectively defined by the international industry standard IEC 60529.

Therefore, it is an object of the present invention to provide a luminaire comprising an indicator and an antenna, wherein the above problems regarding the IP protection offered by the housing of the luminaire and the wireless communication by the antenna with the outside of the housing of the luminaire are overcome.

These and other objects, which become apparent upon reading the following description, are solved by the subject-matter of the independent claims. The dependent claims refer to preferred embodiments of the invention.

The present invention provides a luminaire, preferably an emergency luminaire, for emitting light. The luminaire comprises a housing, preferably metal housing, at least one lighting means, in particular light emitting diode, for providing the light emission of the luminaire, an indicator comprising at least one indicator lighting means, in particular indicator light emitting diode, configured to indicate by light emission information, in particular a status of the luminaire, to the outside of the housing, and an antenna for wireless communication between the luminaire and the outside.

The indicator and the antenna are arranged together on the outside surface of the housing or at least partly in a first opening of the housing.

In other words, the indicator and the antenna are arranged at the same place respectively position on the outside surface of the housing or at least partly in the first opening of the housing.

Therefore, the present invention proposes to arrange the antenna of the luminaire at the place of the indicator of the luminaire respectively to use the infrastructure, which is already present at the luminaire because of the indicator, for the arrangement of the antenna of the luminaire. Since the indicator has to be visible to the outside of the luminaire and, thus, to the outside of the housing of the luminaire, the antenna arranged together with the indicator of the luminaire is not shielded by the housing of the luminaire. Therefore, the housing of the luminaire does not disturb the wireless communication by the antenna with the outside of the luminaire.

In case the indicator is already arranged at least partly in an opening (first opening) of the housing, the invention proposes to arrange the antenna at the place of the indicator, i.e. to arrange the antenna together with the indicator at least partly in the opening of the housing for the indicator. In case the indicator is arranged on the outside surface of the housing, the invention proposes to arrange the antenna at the place of the indicator, i.e. to arrange the antenna together with the indicator on the outside surface of the housing. Therefore, according to the invention no additional opening in the housing has to be provided for the antenna and, thus, the above- described problems regarding the IP protection of the housing, when providing an additional opening in the housing, do not occur.

The luminaire is preferably an emergency luminaire. That is, the luminaire is preferably configured to emit light in an emergency case, such as mains failure, from an electrical energy storage, such as a battery. The energy storage, e.g. battery, may be rechargeable. The electrical energy storage may be a part of the luminaire. In particular, the electrical energy storage is arranged inside the housing of the luminaire.

The housing is made of a material that prevents electromagnetic waves to pass through or that damps electromagnetic waves, thus, preventing or disturbing wireless communication via electromagnetic waves between the inside of the housing and the outside. The housing is preferably at least partly made of metal. In particular, the housing is a metal housing, i.e. a housing made of metal.

Preferably, the at least one lighting means corresponds to one or more light emitting diodes (LEDs), such as organic light emitting diodes, inorganic light emitting diodes etc., which may be electrically connected in parallel and/ or in series. The at least one lighting means is not limited to one or more LEDs, but can alternatively or additionally correspond to other lighting means, such as one or more fluorescence lamps, compact fluorescent lamps etc. The at least one indicator lighting means of the indicator preferably corresponds to one or more light emitting diodes (LEDs), such as organic light emitting diodes, inorganic light emitting diodes etc., which may be electrically connected in parallel and/ or in series. The at least one indicator lighting means of the indicator is not limited to one or more LEDs, but can alternatively or additionally correspond to other lighting means, such as one or more fluorescence lamps, compact fluorescent lamps etc.

The indicator, in particular the at least one indicator lighting means, is configured to indicate by light emission information to the outside of the housing and, thus, to the outside of the luminaire. In particular, the information comprises or corresponds to the status of the luminaire. That is, the indicator, in particular the at least one indicator lighting means, is configured to emit light to the outside of the housing such that the light emitted is indicative of information, in particular of the status of the luminaire.

Preferably, the housing comprises the electronics, such as one or more control units and/ or one or more lighting means drivers, for operating the luminaire. That is, the housing preferably comprises the electronics configured to electrically supply and/ or control the at least one lighting means, the indicator and/ or the antenna. In particular, the housing of the luminaire comprises a control unit configured to control the light emission by the at least one lighting means, the light emission by the indicator and/ or the wireless communication by the antenna.

Preferably, the indicator and the antenna are arranged together in the first opening of the housing of the luminaire.

The antenna comprises or corresponds to one or more antenna elements configured to wirelessly communicate via electromagnetic waves. That is the antenna, in particular the one or more antenna elements, are configured to transmit/ send and receive electromagnetic waves and, thus, to wirelessly communication.

The antenna of the luminaire is not limited to a specific antenna type and/ or antenna structure. Preferably, the antenna is a printed antenna. In the present invention under the term “opening of the housing ”in particular a passage through the housing between the inside and the outside of the housing is understood. The term “hole” may be used as a synonym for the term “opening”.

Preferably, the first opening of the housing corresponds to a slot of the housing. In particular, the first opening of the housing comprises or corresponds to a slot in the outside surface of the housing, wherein the indicator and the antenna are arranged together in the slot.

The at least one lighting means is in particular arranged on the outside surface of the housing of the luminaire. In this case, the at least one lighting means is still electrically supplied and controlled from the inside of the housing, wherein the inside of the housing comprises at least one corresponding element, such as one or more control units and/ or one or more lighting means drivers. The at least one lighting means is in particular arranged on the outside surface of the housing such that the IP protection offered by the housing to elements arranged inside the housing is not negatively affected, i.e. reduced. In case the at least one lighting means is arranged on the outside surface of the housing, the luminaire preferably comprises an optical element, such as a lens arrangement or diffusor arrangement, arranged on the outside surface of the housing. The optical element is translucent, in particular transparent, and, thus, allows light to pass through it. The optical element preferably allows electromagnetic waves for the wireless communication by the antenna to pass through it. The optical element is arranged on the outside surface of the housing such that the at least one lighting means is enclosed by the outside surface of the housing and the optical element and light emitted by the at least one lighting means is emitted through the optical element to the outside of the luminaire. That is, the optical element constitutes a cover for the at least one lighting means, which allows light to pass through it.

The optical element is arranged on the outside surface of the housing such that protection against ingress of solid objects, such as dust, ingress of liquids, such as water, and accidental contact is provided for the at least one lighting means. That is, the optical element has the advantage of providing IP protection to the at least one lighting means. Preferably, the indicator and the antenna are at least partly arranged at a part of the housing for the light emission by the at least one lighting means.

The part of the housing for the light emission by the at least one lighting means corresponds to the part of the housing at which the at least one lighting means is arranged, in particular to the part of the outside surface of the housing on which the at least one lighting means is arranged. The outside surface of the housing on which the at least one lighting means is arranged may also be referred to as a light emission surface of the housing. The light emission surface of the housing is in particular covered by the optical element.

In particular, the indicator and the antenna are at least partly arranged at the at least one lighting means, which may be arranged on the outside surface of the housing.

The indicator and the antenna are preferably at least partly arranged at the light emission surface of the housing. In particular, the indicator and the antenna may be at least partly arranged on the light emission surface of the housing. Alternatively, the light emission surface of the housing may at least partly comprise the first opening of the housing and the indicator and the antenna are arranged together at least partly in the first opening of the housing.

Preferably, the indicator and the antenna are arranged on the outside surface of the housing such that the at least one lighting means is at least partly arranged between the outside surface of the housing and the indicator and the antenna. Further, the indicator and the antenna are preferably arranged on the outside surface of the housing such that the indicator and the antenna are at least partly arranged on the at least one lighting means.

The optical element has the advantage of providing IP protection to the at least one lighting means. In case the indicator and the antenna are arranged at the light emission surface of the housing, the optical element also provides IP protection to the indicator and the antenna.

The antenna and/ or the indicator are preferably made at least partly of a translucent, in particular transparent, material, in case the antenna and the indicator are arranged at least partly at the part of the housing for the light emission by the at least one lighting means.

Preferably, the luminaire may comprise more than one indicator and/ or more than one antenna arranged on the outside surface of the housing or at least partly in the first opening of the housing. In case of a plurality of indicators, the housing may comprise for two or more indicators of the plurality of indicators a separate first opening. That is, in such a case the housing may comprise a plurality of first openings for the plurality of indicators, wherein the number of first openings may be less than the number of indicators. The antenna may then be arranged at least partly in one of the plurality of first openings. In case of more than one antenna, the antennas may be arranged in any of the first openings. In this case, the invention is still advantageous as no additional openings are provided for the antenna(s) besides the first opening(s) of the housing already present for the indicator(s).

According to an embodiment of the present invention, the indicator and the antenna are preferably arranged on an adhesive first membrane, wherein the adhesive first membrane is adhered to the outside surface of the housing. Alternatively, the adhesive first membrane is at least partly arranged in the first opening of the housing. According to the alternative, preferably, the adhesive first membrane is at least partly arranged in the first opening of the housing and adhered to the inside surface of the housing.

In particular, the first membrane comprises a first and second surface, wherein the first surface faces in the direction of the outside of the housing and the second surface faces in the direction of the outside surface of the housing or in the direction of the inside of the housing. Preferably, the second surface of the adhesive first membrane is in contact with the outside surface of the housing in case the first membrane is adhered to the outside surface of the housing. Preferably, the second surface of the adhesive first membrane is adhesive and adhered to the outside surface of the housing. The indicator and the antenna are arranged respectively mounted on the first surface of the adhesive first membrane.

The adhesive first membrane is preferably a flexible circuit board. According to the alternative, the adhesive first membrane preferably protrudes through the first opening of the housing. Additionally, the adhesive first membrane is preferably adhered to the inside surface of the housing.

Preferably, the adhesive first membrane is adhered on the outside surface of the housing such that the at least one lighting means is at least partly arranged between the outside surface of the housing and the adhesive first membrane. In particular, the adhesive first membrane may be at least partly adhered to the at least one lighting means, in case the at least one lighting means is arranged on the outside surface of the housing. The adhesive first membrane may be translucent, in particular transparent.

Further, in case the first opening of the housing comprises or corresponds to a slot of the housing, in particular to a slot in the outside surface of the housing, the adhesive membrane is preferably at least partly arranged in the slot of the housing.

Preferably, the antenna is printed on a second membrane that is arranged on the adhesive first membrane. The second membrane is preferably a flexible membrane.

In particular, the second membrane comprises a first and second surface, wherein the first surface faces in the direction of the outside of the housing and the second surface faces in the direction of the first surface of the first membrane. Preferably, the second surface of the second membrane is arranged on the first surface of the first membrane, in particular is in contact with the first surface of the first membrane. Preferably, the second surface of the second membrane is adhesive and adhered to the adhesive first membrane, in particular to the first surface of the adhesive first membrane. The antenna is preferably printed on the first surface of the second membrane.

In case the adhesive first membrane is at least partly arranged in the first opening of the housing, the second membrane is preferably arranged on the adhesive first membrane such that the second membrane seals the first opening. That is, the second membrane may be used for sealing the first opening in order to provide an IP protection. The second membrane is in particular a flexible membrane for sealing the first opening. Preferably, the second membrane is translucent, in particular transparent, and is arranged on the adhesive first membrane such that the indicator is arranged between the adhesive first membrane and the second membrane.

That is, the second membrane is preferably arranged on the adhesive first membrane such that a cavity is formed between the adhesive first membrane and the second membrane, wherein the cavity comprises the indicator. In particular, the cavity is formed by a part of the second surface of the second membrane and a part of the first surface of the first membrane. The term “space” may be used as a synonym for the term “cavity”.

Further, the luminaire preferably comprises a lead, wherein the lead electrically connects the indicator and the antenna on the adhesive first membrane arranged on the outside surface of the housing through a sealed second opening of the housing to the inside of the housing, or the lead electrically connects the indicator and the antenna on the adhesive first membrane at least partly arranged in the first opening to the inside of the housing.

The lead is preferably a flying lead. The terms “cable” and “wire” may be used as synonyms for the term “lead”.

Preferably, the lead for electrically connecting the indicator and antenna to the inside of the housing is a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead allows a wired communication with the inside of the housing, preferably according to the DALI- or DALI-2 industry standard.

In case the adhesive first membrane is arranged on the outside surface of the housing, the second membrane is preferably arranged on the adhesive first membrane such that the second membrane seals the second opening. That is, the second membrane may be used for sealing the second opening in order to provide an IP protection. The second membrane is in particular a flexible membrane for sealing the second opening. In case the luminaire comprises more than one indicator and/ or antenna, the plurality of indicators and/ or antennas may be electrically connected by one or more leads to the inside of the housing.

According to a further embodiment of the present invention, the indicator and the antenna are preferably arranged on a first circuit board, and the first circuit board is arranged on the outside surface of the housing.

In particular, the first circuit board comprises a first and second surface respectively side, wherein the first surface faces in the direction of the outside of the housing and the second surface faces in the direction of the outside surface of the housing. Preferably, the second surface of the first circuit board is in contact with the outside surface of the housing. The indicator and the antenna are arranged respectively mounted on the first surface of the first circuit board.

Preferably, the at least one lighting means is arranged on the first circuit board. That is, the indicator and the antenna are at least partly arranged at the part of the housing for the light emission by the at least one lighting means (light emission part of the housing).

The first circuit board is preferably a printed circuit board (PCB).

A graphic and/ or branding sticker may be applied to the first side of the circuit board, which is visible to the outside of the housing.

The luminaire preferably comprises a lead, wherein the lead electrically connects the indicator and the antenna through a sealed second opening of the housing to the inside of the housing. The lead is preferably a flying lead.

Preferably, the lead for electrically connecting the indicator and antenna to the inside of the housing is a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead allows a wired communication with the inside of the housing, preferably according to the DALI- or DALI-2 industry standard. Preferably, the first circuit board comprises a gasket, in particular on the second surface respectively rear of the first circuit board, for sealing the electrical connection of the first circuit board to the lead, in particular for sealing the second opening of the housing. The gasket is preferably an adhesive gasket.

According to another embodiment of the present invention, the indicator and the antenna are preferably arranged on a first circuit board, and the first circuit board is at least partly arranged in the first opening of the housing.

In particular, the first circuit board comprises a first and second surface respectively side, wherein the first surface faces in the direction of the outside of the housing and the second surface faces in the direction of the inside of the housing. The indicator and the antenna are arranged respectively mounted on the first surface of the first circuit board.

Preferably, the at least one lighting means is arranged on the first circuit board. That is, the indicator and the antenna are at least partly arranged at the part of the housing for the light emission by the at least one lighting means (light emission part of the housing).

Further, in case the first opening of the housing comprises or corresponds to a slot of the housing, in particular to a slot in the outside surface of the housing, the first circuit board is preferably at least partly arranged in the slot of the housing.

Furthermore, the first circuit board preferably protrudes through the first opening of the housing. The first circuit board is preferably a printed circuit board (PCB),

Preferably, the first circuit board is arranged in a moulding, in particular a plastic moulding, that constitutes a gasket of the first opening. In other words, the moulding is arranged in the first opening of the housing such that the moulding seals the first opening of the housing. Therefore, the moulding provides IP protection for the first circuit board and, thus, for the indicator and antenna, as well as for the housing by sealing the first opening of the housing. Preferably, the moulding allows electromagnetic waves for the wireless communication by the antenna to pass through it. In particular, the first circuit board and, thus, the indicator and antenna are integrated in the moulding. The first circuit board is partly or fully arranged in the moulding.

That is, the moulding partly or fully encloses the first circuit board.

Preferably, the moulding protrudes through the first opening of the housing. In particular, the moulding preferably protrudes through the first opening of the housing such that the moulding seals the first opening of the housing.

Moreover, the moulding preferably snaps through the first opening of the housing compressing a gasket. In particular, the moulding snaps at the outside surface and/ or inside surface of the housing. That is, the moulding arranged in the first opening of the housing is attached to the outside surface and/ or inside surface of the housing.

This seals the first opening and, thus provides an IP protection for the housing.

Further, the luminaire preferably comprises a lead, wherein the lead electrically connects the indicator and the antenna on the first circuit board arranged at least partly in the first opening to the inside of the housing. The lead is preferably a flying lead.

Preferably, the lead for electrically connecting the indicator and antenna to the inside of the housing is a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead allows a wired communication with the inside of the housing, preferably according to the DALI- or DALI-2 industry standard.

Furthermore, the first circuit board preferably comprises at least one electronic element, such as at least one control unit and/ or at least one lighting means driver, configured to electrically supply and/ or control the light emission by the at least one lighting means of the luminaire, the light emission by the indicator, and/ or the wireless communication by the antenna.

That is, the first circuit board preferably comprises at least one or more electronic elements that are configured to electrically supply and/ or control at least one of the light emission by the at least one lighting means, the light emission by the indicator, and the wireless communication by the antenna.

Preferably, the first circuit board comprises at least one electronic element, such as one or more control units and/ or one or more lighting means drivers, configured to electrically supply and control the at least one lighting means and the at least one indicator lighting means of the indicator. Additionally the first circuit board preferably comprises at least one electronic element configured to electrically supply and control the wireless communication via the antenna. That is, at least one electronic element is preferably integrated besides the antenna and the indicator on the first circuit board. The one or more electronic elements may be configured to electrically supply the indicator, the antenna and/ or the lighting means. In addition or alternatively, the one or more electronic elements may be configured to control the light emission by the indicator, the light emission by the at least one lighting means and/ or the wireless communication by the antenna. In particular, the first circuit board is partly arranged inside the housing.

The indicator preferably comprises the at least one indicator lighting means and a light pipe, wherein light emitted by the at least one indicator lighting means is visible at the light pipe. The at least one indicator lighting means and the light pipe are preferably arranged on the first circuit board, which is at least partly arranged in the first opening, such that the at least one lighting means is arranged inside the housing and the light pipe is visible to the outside of the housing.

Preferably, the lead for electrically connecting the first circuit board to the inside of the housing is a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead allows a wired communication with the inside of the housing, preferably according to the DALI- or DALI-2 industry standard.

Moreover, the antenna is preferably printed on the first circuit board. In particular, the antenna is printed on the first surface of the first circuit board.

Preferably, the luminaire comprises a second circuit board inside the housing, wherein the second circuit board comprises at least one electronic element, such as at least one control unit and/ or at least one lighting means driver, configured to electrically supply and/ or control the light emission by the at least one lighting means of the luminaire, the light emission by the indicator, and/ or the wireless communication by the antenna. Additionally, the lead electrically connects the indicator and antenna to the second circuit board.

That is, the second circuit board comprises at least one or more electronic elements that are configured to electrically supply and/ or control at least one of the light emission by the at least one lighting means, the light emission by the indicator, and the wireless communication by the antenna.

In particular, the second circuit board is the main circuit board of the luminaire and the first circuit board is a further circuit board for arranging the indicator and the antenna thereon. Preferably, the at least one lighting means is arranged on the first circuit board.

Preferably, the second circuit board comprises the electronics configured to electrically supply the indicator, the antenna and/ or the at least one lighting means, control the light emission by the at least one indicator lighting means of the indicator, control the light emission by the at least one lighting means, and/ or control the wireless communication by the antenna.

In the light of the above, the luminaire according to the present invention comprises the indicator and the antenna that are arranged together on the outside surface of the housing or that are arranged together at least partly in the first opening of the housing. In particular, the luminaire comprises the adhesive first membrane, on which the indicator and antenna are arranged together, or the first circuit board, on which the indicator and antenna are arranged together. In other words, the indicator and the antenna are preferably integrated together on the adhesive first membrane or the first circuit board.

The adhesive first membrane is adhered to the outside surface of the housing or arranged at least partly in the first opening of the housing. The first circuit is arranged on the outside surface of the housing or arranged at least partly in the first opening of the housing.

That is, according to the invention the indicator and the antenna are arranged at the same place respectively position on the outside surface of the housing or at least partly in the opening of the housing.

In order to achieve the luminaire according to the present invention, some or all of the above described optional features may be combined with each other.

The present invention further provides a lighting system comprising at least one luminaire according to the present invention as described above.

The above description with regard to the luminaire according to the present invention is also valid for the one or more luminaires of the lighting system.

In the following, the invention is described exemplarily with reference to the enclosed figures, in which Figure 1 is a schematic cross-sectional view and a schematic side-view of a part of a luminaire according to an embodiment of the invention;

Figure 2 is a schematic cross-sectional view and a schematic side-view of a part of a luminaire according to a further embodiment of the invention;

Figure 3 is a schematic cross-sectional view and a schematic side-view of a part of a luminaire according to a further embodiment of the invention;

Figure 4 is a schematic cross-sectional view and a schematic side-view of a part of a luminaire according to a further embodiment of the invention;

Figure 5 is a schematic cross-sectional view and schematic side-views of a part of a luminaire according to a further embodiment of the invention.

Figure 6 is a schematic cross-sectional view of a luminaire according to a further embodiment of the invention showing different possible positions at the housing of the luminaire for arranging the indicator and antenna of the luminaire. In addition, an example of a possible form of the housing of a luminaire according to a further embodiment is shown.

In the Figures, corresponding elements are denoted by same reference signs. The dimensions indicated in the Figures are merely by way of example and do not limit the present invention, in particular, the respective embodiment, by any means. The Figures are merely schematic and not necessarily drawn to scale. In particular, some dimensions are exaggerated for describing parts of a luminaire according to the invention.

Figure 1 shows on the left side a schematic cross-sectional view of a part of a luminaire according to an embodiment of the invention and on the right side a side- view of a part of the luminaire.

According to Figure 1, a luminaire 1 comprises a housing 2, an indicator 3 and an antenna 4. The luminaire 1 further comprises at least one lighting means for providing the light emission of the luminaire 1 (not shown in Figure 1). The housing 2 comprises an outside surface 2a facing the outside A of the housing 2 and an inside surface 2b facing the inside B of the housing 2. The luminaire 1 also comprises a circuit board 14 (second circuit board, main circuit board) arranged inside the housing 2. The indicator 3 comprises one or more indicator lighting means 3a (not shown in Figure 1). The antenna comprises or corresponds to one or more antenna elements configured to wirelessly communication via electromagnetic waves (not shown in Figure 1).

The above description with regard to the housing, at least one lighting means, indicator, antenna and second circuit board of the luminaire according to the present invention is valid for the housing 2, at least one lighting means, indicator 3, antenna 4 and circuit board 14 (second circuit board) of the luminaire 1 of Figure 1.

According to the embodiment of Figure 1, the indicator 3 and the antenna 4 are arranged on an adhesive first membrane 6, wherein the adhesive first membrane 6 is adhered to the outside surface 2a of the housing 2. The adhesive first membrane 6 comprises a first and second surface, wherein the first surface faces in the direction of the outside A and the second surface faces in the direction of the outside surface 2a of the housing 2. The second surface of the adhesive first membrane 6 is adhesive and is adhered to the outside surface 2a of the housing 2. As shown in Figure 1, the adhesive first membrane 6, in particular the second surface of the adhesive first membrane 6, is in contact with the outside surface 2a of the housing 2. The indicator 3 and antenna 4 are arranged respectively mounted on the first surface of the first membrane 6.

The luminaire further comprises a second membrane 7, which is arranged on the adhesive first membrane 6. According to the embodiment of Figure 1, the second membrane 7 is a flexible membrane respectively layer, in particular a flexible circuit board. The second membrane 7 comprises a first and second surface, wherein the first surface faces in the direction of the outside A of the housing and the second surface faces in the direction of the first surface of the first membrane 6. As shown in Figure 1, the second surface of the second membrane 7 is arranged on the first surface of the first membrane 6 respectively is in contact with the first surface of the first membrane 6 such that the indicator 3 is arranged between the adhesive first membrane 6 and the second membrane 7. That is, the second membrane 7 is arranged on the adhesive first membrane 6 such that that the indicator 3 is arranged between the adhesive first membrane 6 and second membrane 7. The second membrane 7 is translucent, in particular transparent, such that the light emission by the indicator 3 is visible to the outside.

Thus, as shown in Figure 1, a cavity is 8 is formed by the adhesive first membrane 6 and the second membrane 7, in particular by the first surface of the adhesive first membrane 6 and the second surface of the second membrane 7. The indicator 3 is arranged inside the cavity 8 on the adhesive first membrane 1. That is, the indicator 3 is covered by the second membrane 7.

The second surface of the second membrane 7 may be adhesive and adhered to the adhesive first membrane 6, in particular to the first surface of the adhesive first membrane 6. According to the embodiment of Figure 1, the antenna 4 is printed on the second membrane 7, in particular on the first surface of the second membrane 7.

The luminaire 1 further comprises a lead 9, which may be a flying lead as shown in Figure 1. The indicator 3 and the antenna 4, both arranged on the adhesive first membrane 6 on the outside surface 2a of the housing 2, are electrically connected by the lead 9 through a sealed opening 10 (sealed second opening) of the housing 2 to the inside B of the housing 2. As shown in Figure 1, the lead 9 electrically connects the indicator 3 and the antenna 4 through the sealed opening 10 to the circuit board 14.

The lead 9 may be a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead 9 allows a wired communication with the inside B of the housing 2, preferably according to the DALI- or DALI-2 industry standard.

The second membrane 7 is preferably arranged on the adhesive first membrane 6 such that the second membrane 7 seals the opening 10 of the housing 2. That is, the second membrane 7 may be used for sealing the opening 10 in order to provide an IP protection. The second membrane 7 is in particular a flexible membrane for sealing the opening 10 of the housing 2.

The circuit board 14 comprises a plurality of electronic elements 13, such as one or more control units and/ or one or more lighting means drivers, configured to electrically supply and/ or control the light emission by the at least one lighting means of the luminaire 1, the light emission by the indicator 3, and/ or the wireless communication by the antenna 4.

In other words, the circuit board 14 comprises the electronics configured to electrically supply the indicator 3, the antenna 4 and/ or the at least one lighting means, control the light emission by the at least one indicator lighting means 3a of the indicator 3, control the light emission by the at least one lighting means, and/ or control the wireless communication by the antenna 4.

The above description of a lead and a second circuit board of the luminaire according to the present invention is correspondingly valid to the lead 9 and circuit board 14 of the luminaire 1 of Figure 1. In the light of the above, according to the embodiment of Figure 1, the antenna 4 and the indicator 3 are arranged together on the outside surface 2a of the housing 2 of the luminaire 1. For this arrangement, the antenna 4 and the indicator 3 are arranged on the adhesive first membrane 6 that is adhered to the outside surface 2a of the housing 2. Since the antenna 4 is arranged on the outside of the housing, there are no problems with regard to the housing disturbing a wireless communication by the antenna 4. Moreover, no additional opening in the housing 2 has to be provided for the antenna 4 and, thus, the above-described problems regarding the IP protection of the housing 2, when providing an additional opening in the housing 2, do not occur.

On the right side of Figure 1 a side-view of a part of the luminaire 1 is shown. This side-view of the luminaire 1 differs from the cross-sectional view of the luminaire 1 in that the second membrane 7, on which the antenna 4 is printed on, is arranged on the adhesive first membrane 6 such that the indicator 3 arranged on the adhesive first membrane 6 is not covered by the second membrane 7. Therefore, the side-view of a part of the luminaire 1 on the right side of Figure 1 represents a further embodiment of the present invention. The above description of the cross-sectional view of the luminaire 1 on the left side of Figure 1 is correspondingly valid for the side-view of the luminaire 1 on the right side of Figure 1.

Figure 2 shows on the left side a schematic cross-sectional view of a part of a luminaire according to a further embodiment of the invention and on the right side a side-view of a part of the luminaire.

The luminaire 1 of Figure 2 basically corresponds to the luminaire 1 according to Figure 1. Thus, the above description of the luminaire 1 of Figure 1 is correspondingly valid for the luminaire 1 of Figure 2. Therefore, mainly the differences between the luminaire 1 of Figure 2 and luminaire 1 of Figure 1 are described below.

According to the embodiment of Figure 2, the indicator 3 and the antenna 4 of the luminaire 1 are also arranged on an adhesive first membrane 6. The arrangement of the second membrane 7 (on which the antenna 4 is printed on) on the adhesive first membrane 6 is as outlined above with regard to the luminaire 1 of Figure 1.

The luminaire of Figure 2 differs from the luminaire 1 of Figure 1 in that the housing 2 comprises an opening 5 (first opening) for arranging the adhesive first membrane 6 and the adhesive first membrane 6 is arranged in the opening 5. In other words, according to the embodiment of Figure 2, the indicator 3 and the antenna 4 are not arranged on the outside surface 2a of the housing 2, as it is the case according to the embodiment of Figure 1. Namely, according to the embodiment of Figure 2, the indicator 3 and the antenna 4 are at least partly arranged in the opening 5 of the housing 2.

In particular, the adhesive first membrane 6, on which the indicator 3 and the antenna

4 are arranged, is arranged in the opening 5 of the housing 2. The adhesive first membrane 6 does not has to be fully arranged in the opening 5, but also may only be partly arranged in the opening 5 of the housing 2. That is, the adhesive first membrane 6 may at least partly be arranged in the opening 5.

As shown in Figure 2, the adhesive first membrane 6 is arranged in the opening 5 of the housing 2 and adhered to the inside surface 2b of the housing 2. The adhesive first membrane 6 may protrude through the opening 5 of the housing 2. The opening 5 of the housing 2 shown in Figure 2 corresponds to a passage through the housing 2 between the inside B and the outside A of the housing 2. Alternatively, the opening 5 may comprise or correspond to a slot of the housing 2, in particular to a slot in the outside surface 2a of the housing 2, wherein the adhesive first membrane 6 is at least partly arranged in the slot of the housing 2 (not shown in Figure 2).

The second membrane 7 is preferably arranged on the adhesive first membrane 6 such that the second membrane 7 seals the opening 5 of the housing. That is, the second membrane 7 may be used for sealing the opening 5 in order to provide an IP protection. The second membrane 7 is preferably a flexible membrane for sealing the opening 5, as shown in Figure 2.

As shown in Figure 2, the lead 9 of the luminaire 1 electrically connects the indicator 3 and the antenna 4 on the adhesive first membrane 6, which is arranged in the opening

5 of the housing 2, to the circuit board 14 (second circuit board, main circuit board) arranged inside the housing 2 of the luminaire 1. That is, the lead 9 electrically connects the indicator 3 and the antenna 4 to the inside B of the housing 2.

In the light of the above, according to the embodiment of Figure 2 the antenna 4 and the indicator 3 are together arranged in the opening 5 of the housing 2 of the luminaire 1. For this arrangement, the antenna 4 and the indicator 3 are arranged on the adhesive first membrane 6, which is arranged in the opening 5 of the housing 2. Since the antenna 4 is arranged on the adhesive membrane 6, which is arranged in the opening 5 of the housing 2, there are no problems with regard to the housing 2 disturbing a wireless communication by the antenna 4. Moreover, no additional opening in the housing 2 besides the opening 5, already used for allowing the indicator 3 to emit light to the outside, has to be provided for the antenna 4 and, thus, the above-described problems regarding the IP protection of the housing 2, when providing an additional opening in the housing 2, do not occur.

On the right side of Figure 2, a side-view of a part of the luminaire 1 is shown. This side-view of the luminaire 1 differs from the cross-sectional view of the luminaire 1 in that the second membrane 7, on which the antenna 4 is printed on, is arranged on the adhesive first membrane 6 such that the indicator 3 arranged on the adhesive first membrane 6 is not covered by the second membrane 7. Therefore, the side-view of a part of the luminaire 1 on the right side of Figure 2 represents a further embodiment of the present invention. The above description of the cross-sectional view of the luminaire 1 on the left side of Figure 2 is correspondingly valid for the side-view of the luminaire 1 on the right side of Figure 2.

Figure 3 shows on the left side a schematic cross-sectional view of a part of a luminaire according to a further embodiment of the invention and on the right side a side-view of a part of the luminaire.

The luminaire 1 of Figure 3 basically corresponds to the luminaire according to Figure 1. Thus, the above description of the luminaire 1 of Figure 1 is correspondingly valid for the luminaire 1 of Figure 3. Therefore, mainly the differences between the luminaire 1 of Figure 3 and luminaire 1 of Figure 1 are described below.

According to the embodiment of Figure 3, the indicator 3 and the antenna 4 of the luminaire 1 are also arranged on the outside surface 2a of the housing 2.

The luminaire of Figure 3 differs from the luminaire 1 of Figure 1 in that the indicator 3 and the antenna 4 are arranged on a first circuit board 11 of the luminaire 1, which is arranged on the outside surface 2a of the housing 2. In other words, according to the embodiment of Figure 3, the indicator 3 and the antenna 4 are not arranged on an adhesive first membrane, as it is the case according to the embodiment of Figure 1. Namely, according to the embodiment of Figure 3, the indicator 3 and the antenna 4 are arranged on the first circuit board 11.

The first circuit board 11 comprises a first and second surface, wherein the first surface faces in the direction of the outside A of the housing 2 and the second surface faces in the direction of the outside surface 2a of the housing 2. Between the second surface of the first circuit board 11 and the outside surface 2a of the housing 2 a gasket 11a, in particular an adhesive gasket, is arranged for sealing the opening 10 (second opening) of the housing 2. Alternatively, the second surface of the first circuit board 11 is in contact with the outside surface 2a of the housing 2 (not shown in Figure 3). The indicator 3 and the antenna 4 are arranged respectively mounted on the first surface of the first circuit board 11. The first circuit board 11 may be a printed circuit board (PCB).

According to the embodiment of Figure 3, the antenna 4 is printed on the first circuit board 11. In particular, the antenna 4 is printed on the first surface of the first circuit board 11.

The above description of a first circuit board of the luminaire according to the present invention is correspondingly valid for the first circuit board 11 of the luminaire 1 of Figure 3.

As shown in Figure 3, the lead 9 of the luminaire 1 electrically connects the indicator 3 and the antenna 4 through the sealed opening 10 (sealed second opening) of the housing 2 to the circuit board 14 (main circuit board) arranged inside the housing 2 of the luminaire 1. The circuit board 14 inside the housing 2 may be referred to as the second circuit board. That is, the lead 9 electrically connects the indicator 3 and the antenna 4 through the sealed opening 10 to the inside B of the housing 2.

As described already above, the first circuit board 11 comprises the gasket 11a, in particular on the second surface respectively rear of the first circuit board 11, for sealing the electrical connection of the first circuit board 11 to the lead 9, in particular for sealing the opening 10 of the housing 2. The gasket 11a may be an adhesive gasket. In the light of the above, according to the embodiment of Figure 3 the antenna 4 and the indicator 3 are together arranged on the outside surface 2a of the housing 2 of the luminaire 1. For this arrangement, the antenna 4 and the indicator 3 are arranged on the first circuit board 11, which is arranged on the outside surface 2a of the housing 2. Since the antenna 4 is arranged on the outside of the housing 2, there are no problems with regard to the housing 2 disturbing a wireless communication by the antenna 4. Moreover, no additional opening in the housing 2 has to be provided for the antenna 4 and, thus, the above-described problems regarding the IP protection of the housing 2, when providing an additional opening in the housing 2, do not occur.

On the right side of Figure 3 a side-view of a part of the luminaire 1 is shown. The above description of the cross-sectional view of the luminaire 1 on the left side of Figure 3 is correspondingly valid for the side-view of the luminaire 1 on the right side of Figure 3.

Figure 4 shows on the left side a schematic cross-sectional view of a part of a luminaire according to a further embodiment of the invention and on the right side a side-view of a part of the luminaire.

The luminaire 1 of Figure 4 basically corresponds to the luminaire according to Figure 3. Thus, the above description of the luminaire 1 of Figure 3 is correspondingly valid for the luminaire 1 of Figure 4. Therefore, mainly the differences between the luminaire 1 of Figure 4 and luminaire of Figure 3 are described below.

According to the embodiment of Figure 4, the indicator 3 and the antenna 4 of the luminaire 1 are also arranged on a first circuit board 11.

The luminaire 1 of Figure 4 differs from the luminaire 1 of Figure 3 in that the housing 2 comprises an opening 5 (first opening) for arranging the first circuit board 11 and the first circuit board 11 is arranged in the opening 5. In other words, according to the embodiment of Figure 4, the indicator 3 and the antenna 4 are not arranged on the outside surface 2a of the housing 2, as it is the case according to the embodiment of Figure 3. Namely, according to the embodiment of Figure 4, the indicator 3 and the antenna 4 are at least partly arranged in the opening 5 of the housing 2. The first circuit board 11 comprises a first and second surface, wherein the first surface faces in the direction of the outside A of the housing 2 and the second surface faces in the direction of the inside B of the housing 2. The indicator 3 and the antenna 4 are arranged respectively mounted on the first surface of the first circuit board.

In particular, the first circuit board 11, on which the indicator 3 and the antenna 4 are arranged, is arranged in the opening 5 of the housing 2. The first circuit board 11 does not has to be fully arranged in the opening 5, but also may only be partly arranged in the opening 5 of the housing 2 (see Figure 5). That is, the first circuit board 11 may at least partly be arranged in the opening 5.

As shown in Figure 4, the first circuit board 11 is arranged in the opening 5 of the housing 2. The first circuit board 11 may protrude through the opening 5 of the housing 2. The opening 5 of the housing 2 shown in Figure 4 corresponds to a passage through the housing 2 between the inside B and the outside Aof the housing 2. Alternatively, the opening 5 may comprise or correspond to a slot of the housing 2, in particular to a slot in the outside surface 2a of the housing 2, wherein the first circuit board 11 is at least partly arranged in the slot of the housing 2 (not shown in Figure 4). The first circuit board 11 may be a printed circuit board (PCB).

As shown in Figure 4, the first circuit board 11 is arranged in a moulding 12 that constitutes a gasket of the first opening 5. In other words, the moulding 12 is arranged in the opening 5 of the housing 2 such that the moulding 12 seals the opening 5 of the housing 2. Therefore, the moulding 12 provides IP protection for the first circuit board 11 and, thus, for the indicator 3 and antenna 4, as well as for the housing 2 by sealing the opening 5 of the housing 2. The moulding 12 may be a plastic moulding. In particular, the moulding 12 allows electromagnetic waves for the wireless communication by the antenna to pass through it.

In particular, the first circuit board 11 and, thus, the indicator 3 and antenna 4 are integrated in the moulding 12. As shown in Figure 4, the first circuit board 11 is partly arranged in the moulding 12. That is, the moulding 12 partly encloses the first circuit board 11. The first circuit board 11 may be fully arranged in the moulding 12 (as shown in Figure 5). That is, the moulding 12 may fully enclose the first circuit board 11. As shown in Figure 4, the moulding 12 protrudes through the opening 5 of the housing 2. In particular, the moulding 12 protrudes through the opening 5 of the housing 2 such that the moulding 12 seals the opening 5 of the housing 2.

Furthermore, as shown in Figure 4, the moulding 12 snaps through the opening 5 of the housing 2 compressing the gasket. In particular, the moulding 12 snaps at the outside surface 2a and inside surface 2b of the housing 2. That is, the moulding 12, which is arranged in the opening 5 of the housing 2, is attached to the outside surface 2a and inside surface 2b of the housing 2. This seals the opening 5 and, thus , provides an IP protection for the housing 2.

According to the embodiment of Figure 4, the antenna 4 is printed on the first circuit board 11. In particular, the antenna 4 is printed on the first surface of the first circuit board 11.

The above description of a first circuit board of the luminaire according to the present invention is correspondingly valid to the first circuit board 11 of the luminaire 1 of Figure 4.

As shown in Figure 4, the lead 9 of the luminaire 1 electrically connects the indicator 3 and the antenna 4 to the second circuit board 14 (main circuit board) arranged inside the housing 2 of the luminaire 1. That is, the lead 9 electrically connects the indicator 3 and the antenna 4 to the inside B of the housing 2.

In the light of the above, according to the embodiment of Figure 4 the antenna 4 and the indicator 3 are together arranged in the opening 5 of the housing 2 of the luminaire 1. For this arrangement, the antenna 4 and the indicator 3 are arranged on the first circuit board 11, which is arranged in the opening 5 of the housing 2. Since the antenna is arranged on the first circuit board 11, which is arranged in the opening 5 of the housing 2, there are no problems with regard to the housing 2 disturbing a wireless communication by the antenna. Moreover, no additional opening in the housing 2 besides the opening 5, already used for allowing the indicator 4 to emit light to the outside, has to be provided for the antenna 4 and, thus, the above-described problems regarding the IP protection of the housing, when providing an additional opening in the housing, do not occur. On the right side of Figure 4 a side-view of a part of the luminaire 1 is shown. The above description of the cross-sectional view of the luminaire 1 on the left side of Figure 4 is correspondingly valid for the side-view of the luminaire 1 on the right side of Figure 4.

Figure 5 shows on the left side a schematic cross-sectional view of a part of a luminaire according to a further embodiment of the invention and on the right side side-views of a part of the luminaire.

The luminaire 1 of Figure 5 basically corresponds to the luminaire according to Figure 4. Thus, the above description of the luminaire 1 of Figure 4 is correspondingly valid for the luminaire 1 of Figure 5. Therefore, mainly the differences between the luminaire 1 of Figure 5 and luminaire of Figure 4 are described below.

According to the embodiment of Figure 5, the indicator 3 and the antenna 4 of the luminaire 1 are also arranged on a circuit board 11 (first circuit board) that is arranged in the opening 5 (first opening) of the housing 2. The circuit board 11 of Figure 5 corresponds to the first circuit board 11 of Figure 4. Therefore, the above description of the first circuit board 11 of Figure 4 is correspondingly valid for the circuit board 11 of Figure 5.

The luminaire 1 of Figure 5 differs from the luminaire 1 of Figure 4 in that the circuit board 11 is only partly arranged in the opening 5. In other words, according to the embodiment of Figure 5, the circuit board 11 (first circuit board) is not fully arranged in the opening 5 of the housing 2, as it is the case according to the embodiment of Figure 4. Namely, according to the embodiment of Figure 5, the circuit board 11 is arranged in the opening 5 of the housing 2 and the inside B of the housing 2. That is, the circuit board 11 is partly arranged in the opening 5.

Further, the luminaire 1 of Figure 5 differs from the luminaire 1 of Figure 4 in that besides the circuit board 11 no second circuit board is present inside the housing 2. Thus, the circuit board 11 of the luminaire 1 according to Figure 5 comprises besides the indicator 3 and the antenna 4 the plurality of electronic elements 13, which are comprised by the second circuit board 14 in the embodiments of Figures 1, 2, 3 and 4 Furthermore, the luminaire 1 of Figure 5 differs from the luminaire 1 of Figure 4 in that the circuit board 11 (first circuit board) comprising the indicator 3 and antenna 4 is fully arranged in the moulding 12, i.e. the moulding 12 fully encloses the first circuit board 11. In contrast thereto, in the luminaire 1 of Figure 4, the first circuit board 11 comprising the indicator 3 and antenna 4 is only partly arranged in the moulding 12, i.e. according to Figure 4 the moulding 12 only partly encloses the first circuit board 11

Moreover, the luminaire 1 of Figure 5 differs from the luminaire 1 of Figure 4 in that the lead 9 electrically connects the indicator 3, antenna 4 and the electronic elements 13 arranged on the circuit board 11 to the inside B of the housing. The lead 9 is a flying lead and may be a lead according to the DALI (Digital Addressable Lighting Interface) industry standard or DALI-2 industry standard. In particular, the lead 9 allows a wired communication with the inside B of the housing 2, preferably according to the DALI- or DALI-2 industry standard.

As shown in Figure 5, since the circuit board 11 is partly arranged at the inside B of the housing 2, the indicator 3 comprises the at least one indicator lighting means 3a and a light pipe 3b. Light emitted by the at least one indicator lighting means 3a is visible at the light pipe 3b. The at least one indicator lighting means 3a and the light pipe 3b are arranged on the circuit board 11 such that the at least one lighting means 3a is arranged inside the housing 2 and the light pipe 3b is visible to the outside A of the housing 2.

The circuit board 11 comprises a plurality of electronic elements 13, such as one or more control units and/ or one or more lighting means drivers, configured to electrically supply and/ or control the light emission by the at least one lighting means of the luminaire 1, the light emission by the indicator 3, and/ or the wireless communication by the antenna 4.

In other words, the circuit board 11 comprises the electronics configured to electrically supply the indicator 3, the antenna 4 and/ or the at least one lighting means, to control the light emission by the at least one indicator lighting means 3a of the indicator 3, to control the light emission by the at least one lighting means, and/ or to control the wireless communication by the antenna 4.

According to the embodiment of Figure 5, the antenna 4 is printed on the circuit board 11

The above description of a first circuit board of the luminaire according to the present invention is correspondingly valid to the circuit board 11 of the luminaire 1 of Figure 5.

In the light of the above, according to the embodiment of Figure 5 the antenna 4 and the indicator 3 are together arranged at least partly in the opening 5 of the housing 2 of the luminaire 1. For this arrangement, the antenna 4 and the indicator 3 are arranged on the circuit board 11 that is at least partly arranged in the opening 5 of the housing 2. Since the antenna is arranged on the circuit board 11, which is at least partly arranged in the opening 5 of the housing 2, there are no problems with regard to the housing 2 disturbing a wireless communication by the antenna. Moreover, no additional opening in the housing 2 besides the opening 5, already used for allowing the indicator 4 to emit light to the outside, has to be provided for the antenna 4 and, thus, the above-described problems regarding the IP protection of the housing, when providing an additional opening in the housing, do not occur.

On the right side of Figure 5 side-views of a part of the luminaire 1, namely the moulding 12 of the luminaire 1, are shown. The above description of the cross- sectional view of the luminaire 1 on the left side of Figure 5 is correspondingly valid for the side-views of the luminaire 1 on the right side of Figure 5.

Figure 6 shows on the left side a schematic cross-sectional view of a luminaire according to a further embodiment of the invention showing different possible positions at the housing of the luminaire for arranging the indicator and antenna of the luminaire. On the right side of Figure 6 an example of a possible form of the housing of a luminaire according to a further embodiment is shown.

As shown in Figure 6, the luminaire 1 comprises the housing 2, the at least one lighting means 15 for providing the light emission by the luminaire 1, the indicator 3, the antenna 4 and an optical element 16. Different possible positions cl, c2, c3, c4 and c5 at the housing 2 for arranging the indicator 3 and antenna 4 are shown in Figure 6. That is, the reference signs cl, c2, c3, c4 and c5 denote potential mounting locations for arranging/ mounting the indicator 3 and antenna 4 at the housing 2 of the luminaire 1.

The inside B of the housing 2 is not shown in Figure 6 and may be implemented as outlined above with regard to the Figures 1, 2, 3, 4 and 5 depending on the arrangement of the indicator 3 and antenna 4 at the housing 2. That is, the inside B of the housing 2 is implemented depending on whether the indicator 3 and antenna 4 are arranged on an adhesive first membrane or a circuit board and depending on whether they are arranged on the outside surface 2a of the housing (positions c3, c4 and c5) or at least partly in an opening 5 (first opening) of the housing 2 (positions cl and c2).

Therefore, the description of the luminaires 1 according to Figures 1, 2, 3, 4 and 5 is correspondingly valid for the luminaire 1 of Figure 6, depending on the position cl, c2, c3, c4 and c5 of the indicator 3 and antenna 4 at the housing 2 of the luminaire 1.

As shown in Figure 6, the at least one lighting means 15 is arranged on the outside surface 2a of the housing 2 of the luminaire 1. In this case, the at least one lighting means 15 are electrically supplied and controlled from the inside B of the housing 2, comprising at least one corresponding element, such as one or more control units and/ or one or more lighting means drivers (not shown in Figure 6). The at least one lighting means 15 is in particular arranged on the outside surface 2a of the housing 2 such that the IP protection offered by the housing 2 to elements arranged inside the housing 2 is not negatively affected, i.e. reduced.

The optical element 16 may comprise or correspond to a lens arrangement or diffusor arrangement and is arranged on the outside surface 2a of the housing 2. The optical element 16 is translucent, in particular transparent, and, thus, allows light to pass through it. The optical element 16 may allow electromagnetic waves for the wireless communication by the antenna 4 to pass through it.

As shown in Figure 6, the optical element 16 is arranged on the outside surface 2a of the housing 2 such that the at least one lighting means 15 is enclosed by the outside surface 2a of the housing 2 and the optical element 16 and light emitted by the at least one lighting means 15 is emitted through the optical element 16 to the outside of the luminaire 1. That is, the optical element 16 constitutes a cover for the at least one lighting means 15, which allows light to pass through it.

The optical element 16 is arranged on the outside surface 2a of the housing, such that protection against ingress of solid objects, such as dust, ingress of liquids, such as water, and accidental contact is provided for the at least one lighting means 15. That is, the optical element 16 has the advantage of providing IP protection to the at least one lighting means 15.

In case the indicator 3 and the antenna 4 are arranged inside the optical element 16, in particular at the light emission surface of the housing 2, the optical element 16 also provides IP protection for the indicator 3 and the antenna 4.

In Figure 6, the part of the housing 2 for the light emission by the at least one lighting means 16 corresponds to the part of the outside surface 2a of the housing 2 on which the at least one lighting means 15 is arranged. The outside surface 2a of the housing 2 on which the at least one lighting means 15 is arranged may also be referred to as a light emission surface of the housing 2. Thus, as shown in Figure 6, the light emission surface of the housing 2 is covered by the optical element 16.

In the following, the different possible positions cl, c2, c3, c4 and c5 for arranging the indicator 3 and antenna 4 together at the housing 2 are described:

The indicator 3 and antenna 4 may be arranged together in an opening 5 of the housing 2 outside the optical element 16. This is shown in Figure 6 at the position cl of the housing 2.

Alternatively, the indicator 3 and the antenna 4 may be arranged together in an opening 5 of the housing 2 inside the optical element 16. This is shown in Figure 6 at the position c2 of the housing 2.

Alternatively, the indicator 3 and the antenna 4 may be arranged on the outside surface 2a of the housing 2 such that the at least one lighting means 15 is at least partly arranged between the outside surface 2a of the housing 2 and the indicator 3 and the antenna 4. That is, the indicator 3 and the antenna 4 may be arranged on the outside surface 2a of the housing 2 such that the indicator 3 and the antenna 4a are arranged on the at least one lighting means 15. This is shown in Figure 6 at the position c3 of the housing. In this case, the antenna and the indicator may be made at least partly of a translucent, in particular transparent, material.

Alternatively, the indicator 3 and the antenna 4 may be only partly arranged at the at least one lighting means 15 (not shown in Figure 6). Therefore, the indicator 3 and the antenna 4 may be partly or fully arranged at the light emission surface of the housing

2

In case the indicator 3 and the antenna 4 are arranged on the adhesive first membrane adhered to the outside surface 2a of the housing 2 (as shown in Figure 1), the adhesive first membrane may be adhered on the outside surface 2a of the housing 2 such that the at least one lighting means 15 is at least partly arranged between the outside surface 2a of the housing 2 and the adhesive first membrane (not shown in Figure 6). The adhesive first membrane may be a flexible membrane. In particular, the adhesive first membrane may be partly or fully adhered to the at least one lighting means 15. In this case, the adhesive first membrane may be translucent, in particular transparent.

In case the indicator and the antenna are arranged on the circuit board (first circuit board), as shown in Figures 3, 4 and 5, the at least one lighting means 15 may be arranged on the circuit board (not shown in Figure 6).

Alternatively, the indicator 3 and the antenna 4 may be arranged together on the outside surface 2a of the housing 2 inside the optical element 16, but not at the position of the at least one lighting means 15. This is shown in Figure 6 at the position c4 of the housing.

Alternatively, the indicator 3 and the antenna 4 may be arranged together on the outside surface 2a of the housing 2 outside the optical element 16. This is shown in Figure 6 at the position c5 of the housing.

On the right side of Figure 6 an example of a possible form (shape) of the housing 2 of a luminaire 1 according to a further embodiment is shown. The housing 2 of the luminaire 1 shown on the right side of Figure 2 has such a form (shape) that the at least one lighting means 15 is arranged in a cavity formed on three sides by the outside surface 2a of the housing 2. The optical element 16 is arranged such that it closes the cavity. Nevertheless, the at least one lighting means 15 is arranged on the outside surface 2a of the housing 2. In other words, on one side of the housing 2, at least a part of the outside surface 2a of the housing 2 is recessed with respect to the rest of the outside surface 2a, wherein the at least one lighting means 15 is arranged on the recessed part of the outside surface 2a of the housing 2.

The indicator and antenna of the luminaire 1 may be arranged in the housing 2 of the luminaire shown on the right side of Figure 6 as described above with respect to the luminaire 1 shown on the left side Figure 6. Therefore, the above description of the cross-sectional view of the luminaire 1 on the left side of Figure 6 is correspondingly valid for the luminaire 1 shown on the right side of Figure 6.