Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HOUSING FOR AN AUTOMOTIVE LIGHTING DEVICE, METHOD FOR MANUFACTURING SUCH A HOUSING AND AUTOMOTIVE LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/105464
Kind Code:
A9
Abstract:
The invention provides a housing (1) for an automotive lighting device, the housing (1) having a demoulding direction (d1), defined as the direction along which the housing is configured to be introduced and extracted from a mould, wherein the housing comprises a wall (2) which forms an angle between 1º and 25º with respect 5 to the demoulding direction (d1) and an angle between 1º and 25º with respect to a second direction (d2), the second direction (d2) being perpendicular to the demoulding direction (d1).

Inventors:
GOMEZ RUIZ CARLOS (ES)
OCHOA IBAÑEZ ANA MARIA (ES)
TRIGO UREÑA JUAN MIGUEL (ES)
GARCIA MELCHOR PEDRO MANUEL (ES)
BRASSIER MARC (FR)
Application Number:
PCT/EP2020/083785
Publication Date:
March 31, 2022
Filing Date:
November 27, 2020
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
VALEO VISION (FR)
International Classes:
B29C59/00; B29C45/00; B29C59/14; B29C71/00
Attorney, Agent or Firm:
VALEO VISIBILITY (FR)
Download PDF:
Claims:
9

Claims

[Claim 1 ] Housing (1 ) for an automotive lighting device, the housing (1 ) having a demoulding direction (d1 ), defined as the direction along which the housing is configured to be introduced and extracted from a mould, wherein the housing comprises a wall (2) which forms an angle between 1 s and 25Q with respect to the demoulding direction (d1 ) and an angle between 1s and 25s with respect to a second direction (d2), the second direction (d2) being perpendicular to the demoulding direction (d1 ).

[Claim 2] Housing according to claim 1 , wherein the wall (2) forms an angle between 8s and 20s with respect to the demoulding direction (d1 ) and an angle between 8s and 20s with respect to the second direction (d2).

[Claim 3] Housing according to any of the preceding claims, wherein the wall (2) comprises a hydrophobic substance, with a Young contact angle higher than 80s.

[Claim 4] Housing according to any of the preceding claims, wherein the hydrophobic substance comprises a fluorinated based polymer.

[Claim 5] Housing according to claim 4, wherein the hydrophobic substance comprises at least one of PTFE, fluorosiloxanes or organic siloxanes.

[Claim 6] Housing according to any of the preceding claims, wherein the wall comprises at least one sink hole (3) suitable to allow water to exit the housing.

[Claim 7] Housing according to claim 6, wherein the sink hole (3) is covered by a ventilation cap.

[Claim 8] Housing according to any of the preceding claims, wherein the wall (1 ) comprises a groove (4).

[Claim 9] Housing according to any of the preceding claims, wherein the wall (1 ) is located in a position intended to be the lowest part of the housing when installed in an automotive vehicle.

[Claim 10] Method for manufacturing a housing according to any of the preceding claims, comprising the steps of:

RECTIFIED SHEET (RULE 91) ISA/EP - demoulding a housing structure (1 ’) comprising a wall (2) which forms an angle between 1 s and 25Q with respect to the demoulding direction (d1 ) and an angle between 13 and 25s with respect to a second direction (d2), the second direction (d2) being perpendicular to the demoulding direction (d1 );

- depositing a fluorinated based polymer, such as PTFE, fluorosiloxanes or organic siloxanes, on the wall (2).

[Claim 11] Method according to claim 10, further comprising the step of masking a glue channel of the housing structure to prevent the deposition of the fluorinated based polymer.

[Claim 12] Method according to any of claims 10 or 1 1 , wherein the deposition of the fluorinated based polymer is done by one of these methods

- directly by physical vapour deposition of the fluorinated based polymer, such as by radiofrequency magnetron sputtering; or

- by plasma-enhanced chemical vapour deposition of the fluorinated based polymer; or

- by sol-gel coating of the fluorinated based polymer.

[Claim 13] Method according to claim 12, wherein the step of depositing the fluorinated based polymer further comprises the use of a highly organics layer, such as organosiloxane or hydrocarbide precursors.

[Claim 14] Method according to any of claims 12 or 13, further comprising the step of performing a plasma treatment on the surface of the wall before depositing the fluorinated based polymer.

[Claim 15] Automotive lighting device (10) comprising a housing according to any of claims 1 to 9 and a plurality of solid-state light sources (5). |

RECTIFIED SHEET (RULE 91) ISA/EP

Description:
Description

Title: Housing for an automotive lighting device, method for manufacturing such a housing and automotive lighting device

[0001 ] The present invention belongs to the field of lamps for automotive vehicles, and more specifically, to the design of headlamps to avoid fogging in the outer glass.

[0002] Current headlamps have to fulfil different requirements which sometimes involve contradictory design paths. One example of this is related to demisting problems.

[0003] Misting is caused when water vapour condenses on the internal surface of a glass. Micro-drops are unaesthetic and affect the light behaviour, so great efforts are put to solve this problem.

[0004] Many different designs are used to solve this problem, and all of them have pros and cons. Hence, an alternative solution is sought for avoiding vapour condensation.

[0005] The invention provides a solution for improving demisting behaviour by the provision of a housing for an automotive lighting device according to claim 1 , a method for manufacturing such a housing according to claim 10 and an automotive lighting device according to claim 15. Preferred embodiments of the invention are defined in dependent claims.

[0006] Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be interpreted as is customary in the art. It will be further understood that terms in common usage should also be interpreted as is customary in the relevant art and not in an idealised or overly formal sense unless expressly so defined herein.

[0007] In this text, the term “comprises” and its derivations (such as “comprising”, etc.) should not be understood in an excluding sense, that is, these terms should not be interpreted as excluding the possibility that what is described and defined may include further elements, steps, etc.

RECTIFIED SHEET (RULE 91) ISA/EP [0008] In a first inventive aspect, the invention provides a housing for an automotive lighting device, the housing having a demoulding direction, defined as the direction along which the housing is configured to be introduced and extracted from a mould, wherein the housing comprises a wall which forms an angle between 1 and 25° with respect to the demoulding direction and an angle between 1 and 25° with respect to a second direction, the second direction being perpendicular to the demoulding direction.

[0009] This housing advantageously provides a wall which is arranged to ease the dripping down of drops. The wall has a slope not only in the demoulding direction, but also in a second direction which is perpendicular to the demoulding direction. This double slopping makes it easier for water drops to drip down.

[0010] This wall is a direct result of the housing manufacturing product, there is no need to incorporate an additional part to provide this effect.

[0011 ] In some particular embodiments, the wall forms an angle between 8° and 20° with respect to the demoulding direction and an angle between 8° and 20° with respect to the second direction.

[0012] These angle ranges are optimal to ensure water drips down and not to excessively enlarge the size of the housing.

[0013] In some particular embodiments, the wall comprises a hydrophobic substance, with a Young contact angle higher than 80°.

[0014] The hydrophobic substance improves the dripping down of water drops along the wall, avoiding the vapour condensing in the lens.

[0015] In some particular embodiments, the hydrophobic substance comprises a fluorinated based polymer. In more particular embodiments, the hydrophobic substance comprises at least one of PTFE, fluorosiloxanes or organic siloxanes.

[0016] These are examples of hydrophobic substances which are particularly suitable for this invention.

[0017] In some particular embodiments, the wall comprises at least one sink hole suitable to allow water to exit the housing. [0018] Water dripping down the wall finds a sink hole to exit the interior of the housing, to decrease the water content inside the housing.

[0019] In some particular embodiment, the sink hole is covered by a ventilation cap.

[0020] This ventilation cap is useful to allow water to exit the housing, but to prevent the entrance of water or dust inside the housing.

[0021 ] In some particular embodiments, the wall comprises a groove.

[0022] This groove is useful to guide the drops running down the wall, and ease the dripping process.

[0023] In some particular embodiments, the wall is located in a position intended to be the lowest part of the housing when installed in an automotive vehicle.

[0024] In a second inventive aspect, the invention provides a method for manufacturing a housing according to any of the preceding claims, comprising the steps of:

- demoulding a housing structure comprising a wall which forms an angle between 1° and 25° with respect to the demoulding direction and an angle between 1° and 25° with respect to a second direction, the second direction being perpendicular to the demoulding direction;

- depositing a fluorinated based polymer, such as PTFE, fluorosiloxanes or organic siloxanes, on the wall.

[0025] This method provides a housing to be used in an automotive lighting device, with a wall adapted to provide a dripping path for water drops that may accumulate in the interior of the housing.

[0026] In some particular embodiments, the method further comprises the step of masking a glue channel of the housing structure to prevent the deposition of the fluorinated based polymer.

[0027] The glue channel is an edge of the housing which is glued to be attached to the outer lens. This channel cannot receive the fluorinated based polymer, since it would affect to the gluing of this surface, so the previous masking is a good option to prevent the polymer from being deposited in this channel. [0028] In some particular embodiment, the deposition of the fluorinated based polymer is done by one of these methods

- directly by physical vapour deposition of the fluorinated based polymer, such as by radiofrequency magnetron sputtering; or

- by plasma-enhanced chemical vapour deposition of the fluorinated based polymer; or

- by sol-gel coating of the fluorinated based polymer.

[0029] These methods are specially indicated to deposit the fluorinated based polymer in the wall of the housing.

[0030] In some particular embodiments, the step of depositing the fluorinated based polymer further comprises the use of a highly organics layer, such as organosiloxane or hydrocarbide precursors.

[0031 ] The use of these precursors affects to the adherence of the polymer layer on the housing wall surface.

[0032] In some particular embodiments, the invention further comprises the step of performing a plasma treatment on the surface of the wall before depositing the fluorinated based polymer.

[0033] If needed by the manufacturer’s requirements, it is possible to obtain a superhydrophobic oleophobic surface by a plasma treatment. This treatment is made with oxygen or air to the previously texturized surface at nanoscale (100/500 nm) before the coating deposition.

[0034] In a third inventive aspect, the invention provides an automotive lighting device comprising a housing according to the first inventive aspect and a plurality of solid-state light sources.

[0035] The term "solid state" refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation. The typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the life span of the illumination device. Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.

[0036] To complete the description and in order to provide for a better understanding of the invention, a set of drawings is provided. Said drawings form an integral part of the description and illustrate an embodiment of the invention, which should not be interpreted as restricting the scope of the invention, but just as an example of how the invention can be carried out. The drawings comprise the following figures:

[0037] [Fig. 1 ] shows a perspective view of a housing according to the invention, suitable for being installed in an automotive lighting device.

[0038] [Fig. 2] is a section of the aforementioned housing according to the plane perpendicular to the demoulding direction.

[0039] [Fig. 3] is a section of the aforementioned housing according to the plane perpendicular to the second direction.

[0040] [Fig. 4a] and [Fig. 4b] show different steps of a manufacturing method according to the invention.

[0041 ] [Fig. 5] shows a lighting device according to the invention, comprising a housing as described in the aforementioned figures.

[0042] Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate:

[0043] 1 Housing

[0044] T Housing structure

[0045] 2 Wall of the housing

[0046] 3 Sink hole

[0047] 4 Channel [0048] 5 LED

[0049] 10 Automotive lighting device

[0050] 100 Automotive vehicle

[0051 ] d1 Demoulding direction

[0052] d2 Second direction

[0053] The example embodiments are described in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to understand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.

[0054] Accordingly, while embodiment can be modified in various ways and take on various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. There is no intent to limit to the particular forms disclosed. On the contrary, all modifications, equivalents, and alternatives falling within the scope of the appended claims should be included. Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate.

[0055] Figure 1 shows a perspective view of a housing 1 according to the invention, suitable for being installed in an automotive lighting device.

[0056] This housing 1 has been manufactured by plastic injection, and has a demoulding direction d1 . This demoulding direction d1 is the direction along which the housing is configured to be introduced and extracted from the mould during the manufacturing process.

[0057] Further, a second direction d2 is defined for the purpose of the invention. This second direction is perpendicular to the demoulding direction d1. In an axis system referred to the position of the housing in the automotive lighting device, the demoulding direction d1 would be substantially parallel to the light projection direction and the second direction d2 would be substantially parallel to a line joining the two lighting devices of the vehicle. Both directions d1 , d2 would therefore define a plane which is substantially parallel to the road surface.

[0058] This wall 2 comprises a hydrophobic substance, such as PTFE, which confers the wall surface with a Young contact angle of about 95°.

[0059] The wall 2 also comprises a sink hole 3 suitable to allow water to exit the housing 1 when water drops drip down the surface of the wall 2. In fact, there is a groove 4 which directs the running of water drops and guides them towards the sink hole 3.

[0060] Figure 2 is a section of the aforementioned housing 1 according to the plane perpendicular to the demoulding direction d1 , indicated in figure 1 as section A-A. In this figure, the wall is observed to form 15° with respect to the second direction d2.

[0061 ] In this figure, it may be observed how the wall 2 is supposed to be located in a position intended to be the lowest part of the housing when installed in an automotive vehicle.

[0062] Figure 3 is a section of the aforementioned housing 1 according to the plane perpendicular to the second direction d2, indicated in figure 1 as section B-B. In this figure, the wall 2 is observed to form 15° with respect to the demoulding direction d1 .

[0063] Figures 4a and 4b show different steps of a manufacturing method according to the invention.

[0064] Figure 4a shows the deposition of a fluorosiloxane compound in a housing structure T which has been demoulded according to a demoulding direction. This housing structure T comprises a wall 2 which forms an angle of 15° with respect to the demoulding direction and an angle of 15° with respect to a second direction perpendicular to the demoulding direction, as shown in the previous figures.

[0065] This housing structure comprises a mask which is located on a glue channel of the housing structure T.

[0066] This figure 4a shows a first previous treatment which includes performing a plasma treatment over the wall 2. [0067] Figure 4b shows a second step, which includes the deposition of the fluorosiloxane compound by plasma-enhanced chemical vapour deposition. In this step, organosiloxane precursors are being used to improve the adherence of the fluorosiloxane layer. [0068] Figure 5 shows a lighting device 10 comprising a housing 1 as described in the aforementioned figures, once being installed in an automotive vehicle 100. This automotive lighting device 10 comprises a plurality of LEDs 5.

[0069] This automotive vehicle 100 will have their headlamps easily demisted without using active elements, thus being able to keep its compact size..