An LED Illuminating Device

Technical Field

The present invention relates to an LED illuminating device. Background Art

As everyone knows, LED illumination has irreplaceable advantages, such as energy saving, low power consumption, and electrical-to-optical conversion efficiency near to 100%. It can save more than 80% energy and has a longer service lifetime compared with the traditional light source with the same illuminating efficiency. In view of the above advantages, the LED is used more and more as a light source such as a lot of LED retrofit lamps in the market. Such LED retrofit lamps have the same appearance and profile as the traditional light source such as incandescent lamp, thus they can be more applicable to the existing illuminating systems as a light source .

An LED retrofit lamp is disclosed in the prior art. The LED retrofit lamp has a driver housing for accommodating an LED driver, a heat sink that has one end fixed on the driver housing and the other end thermally contacting a printed circuit board carrying an LED light-emitting assembly, and a hemispherical bulb provided at the other end of the heat sink to enclose the printed circuit board carrying the LED light- emitting assembly. The heat sink of such LED retrofit lamp is configured to be hollow to arrange the driver housing for accommodating the LED driver therein. However, as the driver housing mostly made from plastic or the printed circuit board carrying the LED light-emitting assembly should be fixed on the heat sink via bolts or surface-mount technology such as welding, this may cause crack of the plastic driver housing or the heat sink when fixed via welding or bolts and also may result in damage to electronic devices sensitive to temperature on the printed circuit board.

Summary of the Invention

Therefore, the present invention provides an LED illuminating device, of which various parts do not need to be assembled together via traditional bolts or surface-mount technology such as welding, so that adverse influences on the parts of the LED illuminating device will be effectively avoided during the assembling and the assembling becomes simpler.

The object of the present invention is accomplished via an LED illuminating device. The LED illuminating device comprises a heat sink, a light engine, an LED driver and a driver housing for accommodating the LED driver, wherein a separation wall is formed in the heat sink, and the light engine and the driver housing accommodating the LED driver are arranged on a first surface and a second surface of the separation wall opposite to each other, wherein the LED illuminating device further comprises a connector that presses the light engine on the first surface of the separation wall and is locked with the driver housing on the second surface of the separation wall. Various parts of the LED illuminating device according to the present invention do not need to be assembled together via traditional bolts or surface-mount technology such as welding, so that adverse influences caused by connection via welding or bolts on the parts of the LED illuminating device will be effectively avoided and the assembling becomes simpler.

According to a preferred solution of the present invention, the connector comprises a plate-like body having at least two hooks extending from the plate- like body, the driver housing has at least two openings for engaged with respective hook. As the connector and the driver housing are arranged on two opposite surfaces of the separation wall of the heat sink, the connector and the driver housing tightly hold the separation wall of the heat sink, and further the heat sink per se, therebetween after respective hook is engaged with respective opening, thereby, a stable fixed connection is established. Such simple engagement completely replaces the traditional assembling manner, and bolts or welding is not used.

Preferably, the hooks are arranged on a circumferential edge of the plate-like body, opposite to each other. Accordingly, the connector and the driver housing can be stably connected after respective hook is engaged with respective opening.

According to the present invention, at least two first through holes are opened in the separation wall, and respective hook is engaged with respective opening through respective first through hole. As the hook passes through the first through hole, the heat sink is assured to revolve in relation to the connector, which further holds the heat sink stably between the connector and the driver housing.

In one solution of the present invention, the light engine comprises a printed circuit board and an LED chip arranged on the printed circuit board. Preferably, a second through hole is opened in the separation wall, wherein a cut is formed on the printed circuit board, and an electrical pin of the LED driver passes through the cut via the second through hole. Further preferably, a light emergent opening for exposing the LED chip and a pin hole through which the electrical pin passes are opened in the plate-like body, an electrical rail is formed on an inner wall of the pin hole, a conductive contact is formed on the printed circuit board, and the electrical rail conductively contacts the conductive contact and the electrical pin, respectively. With this configuration, the connector, on one hand, serves the function of fixing the light engine and the driver housing, and on the other hand, serves the function of an electrical connection bridge between the light engine and the driver, wherein the electrical connection is realized via simple direct contact without welding, which significantly simplifies the manufacturing process and reduces the cost.

Preferably, a projecting portion is formed on the plate-like body at one side of the plate- like body away from the printed circuit board, and the pin hole is opened in the projecting portion. The projecting portion may envelop entirely the electrical pin passing through the cut of the printed circuit board so as to protect the same and prevent foreign matters from contacting the electrical pin, avoiding undesirable short circuit.

Advantageously, has a profile matching the printed circuit board, the circumferential edge of the plate-like body encloses a circumferential edge of the printed circuit board. The connector according to the present invention encloses entirely the printed circuit board, thus the printed circuit board is further protected against external interference.

According to the present invention, the connector is made from an insulating material. Of course, the connector also may be made from other materials including metals such as copper having a high coefficient of thermal conductivity, while the printed circuit board should be subjected to an insulation process for assuring the connector made from metals not to cause short circuit of the parts on the printed circuit board.

Brief Description of the Drawings

The accompanying drawings constitute a part of the present Description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention and are used to describe the principles of the present invention together with the Description. In the accompanying drawings the same components are represented by the same reference numbers. As shown in the drawings :

Fig. 1 is an exploded view of an LED illuminating device of the present invention;

Fig. 2 is a schematic diagram of the assembled LED illuminating device assembled of the present invention;

Fig. 3a is a schematic diagram of one surface of a connector of the LED illuminating device of the present invention; Fig. 3b is another schematic diagram of the other surface of the connector of the LED illuminating device of the present invention;

Fig. 3c is a schematic diagram of a light engine of the LED illuminating device of the present invention;

Fig. 3d is a schematic diagram of a driver of the LED illuminating device of the present invention;

Fig. 3e is a schematic diagram of a heat sink of the LED illuminating device of the present invention; and

Fig. 3f is a schematic diagram of a driver housing of the LED illuminating device of the present invention.

Detailed Description of the Embodiments

Fig. 1 is an exploded view of an LED illuminating device of the present invention. As can be seen from Fig. 1, the LED illuminating device according to the present invention comprises a heat sink 1, a light engine 2, an LED driver 3 and a driver housing 4 for accommodating the LED driver 3. In the present embodiment, the LED illuminating device according to the present invention is configured as an LED retrofit lamp having the appearance and profile of the traditional incandescent lamp. It can be seen from Fig. 1 that a separation wall A is formed in the heat sink 1, and the light engine 2 and the driver housing 4 accommodating the LED driver 3 are arranged on a first surface and a second surface of the separation wall A opposite to the first surface, respectively. Besides, the LED illuminating device according to the present invention further comprises a connector 5 that presses the light engine 2 on the first surface of the separation wall A and is locked with the driver housing 4 on the second surface of the separation wall A. Fig. 2 is a schematic diagram of the assembled LED illuminating device of the present invention .

Fig. 3a - Fig. 3f are schematic diagrams of various parts of the LED illuminating device of the present invention. Fig. 3a is a schematic diagram of one surface of the connector 5, wherein the connector 5 comprises a plate-like body 5a having at least two hooks 6 extending from the plate-like body 5a, and the driver housing 4 shown in Fig. 3f has at least two openings 7 in cooperation with the hooks 6. In addition, it can be seen further from Fig. 3a that the plate- like body 5a has a projecting portion 5e at one side away from a printed circuit board 2a, and a pin hole 5c is formed in the projecting portion 5e. Besides, in the present embodiment, a light emergent opening 5b is formed in a center of the plate- like body 5a for exposing an LED chip 2c of the light engine 2 shown in Fig. 3c.

Fig. 3b is another schematic diagram of the other surface of the connector 5. As can be seen from Fig. 3b, the hooks 6 are arranged on opposite sides of a circumferential edge of the plate-like body 5a that has a profile matching the printed circuit board 2a, and a circumferential edge 5f extending towards a direction of the printed circuit board 2a is formed at one side of the plate- like body 5a facing the printed circuit board 2a and encloses a circumferential edge of the printed circuit board 2a. Besides, it can be seen from Fig. 3a and Fig. 3b that an electrical rail 5d is formed on an inner wall of the pin hole 5c and electrically contacts an electrical pin 3a of the LED driver 3 shown in Fig. 3d. Moreover, as can be seen from Fig. 3b, the electrical rail 5d extends onto a surface of the plate-like body 5a for allowing an electric contact between the electrical rail 5d and a conductive contact 2d on the printed circuit board 2a shown in Fig. 3c during assembling.

It can be seen from Fig. 3c that the light engine 2 comprises the printed circuit board 2a and the LED chip 2c arranged on the printed circuit board 2a, a cut 2b is formed on the printed circuit board 2a, and the conductive contact 2d is formed near the cut 2b.

Fig. 3e is a schematic diagram of the heat sink of the LED illuminating device of the present invention. As can be seen from Fig. 3e, the separation wall A is formed in the heat sink 1, and the light engine 2 and the driver housing 4 accommodating the LED driver 3 are arranged on the first surface and the second surface of the separation wall A opposite to each other, respectively. And further, two first through holes la are opened in the separation wall A, and respective hook 6 passes through the first through hole la to be engaged with respective opening 7. A second through hole lb is further opened in the separation wall A, and the electrical pin 3a of the LED driver 3 passes through the second through hole lb to insert into the cut 2b.

It can be seen from Fig. 3f that the openings 7 are opened in a housing wall of the driver housing 4. In practical assembling, the driver housing 4 is inserted into an accommodation portion of the heat sink 1 against the second surface of the separation wall A of the heat sink 1; and at the same time, the electrical pin 3a of the driver 3 passes through the second through hole lb of the separation wall A. Moreover, the light engine 2 is arranged on the separation wall A to align the cut 2b of the light engine 2 with the second through hole lb of the separation wall A. Thereafter, the connector 5 is coupled with the light engine 2 to expose the LED chip 2c of the light engine 2 from the light emergent opening 5b of the connector 5; respective hook 6 of the connector passes through respective first through hole la of the separation wall A and is engaged with respective opening 7, and the electrical pin 3a passes through the cut 2b to insert into the pin hole 5c. The electrical rail 5d is formed on the inner wall of the pin hole 5c and conductively contacts the conductive contact 2d and the electrical pin 3a, respectively, therefore, a reliable electrical connection is established between the driver 3 and the light engine 2.

The above is merely preferred embodiments of the present invention but not to limit the present invention. For the person skilled in the art, the present invention may have various alterations and changes. Any alterations, equivalent substitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.

List of reference signs

1 heat sink

la first through hole lb second through hole

2 light engine

2a printed circuit board

2b cut

2c LED chip

3 LED driver

3a electrical pin

4 driver housing

5 connector

5a plate-like body

5b light emergent opening

5c pin hole

5d electrical rail

5e projecting portion circumferential edge opening

tion wall