WO2015027407A1

WO2015027407A1 - Light-emitting diode lamp

Info

Publication number: WO2015027407A1
Application number: PCT/CN2013/082444
Authority: WO
Inventors: 陈惠强
Original assignee: Chen Hui Chiang
Priority date: 2013-08-28
Filing date: 2013-08-28
Publication date: 2015-03-05

Abstract

A light-emitting diode lamp (1), comprising a power source supply component (10), a lamp shade housing (20), a fan (30), a heat dissipation component (40) and a light-emitting module (50). One end of the power source supply component (10) is provided with a power source connecting part (11), and the other end thereof is fixed to the lamp shade housing (20). The lamp shade housing (20) is provided with a fan accommodating space (21) and a heat dissipation component accommodating space (22) which are in communication with each other, and is provided with a plurality of air inlet openings (23) which are in communication with the outside and the fan accommodating space (21). The fan (30) is arranged in the fan accommodating space (21) and is electrically connected to the power source supply component (10) in a waterproof manner. The heat dissipation component (40) is arranged in the heat dissipation component accommodating space (22), and is provided with a light-emitting module accommodating space (41), an air receiving part (42) and a plurality of exhaust passages (43); and the air receiving part (42) is located at one end of the heat dissipation component (40) adjacent to the fan (30), the light-emitting module (50) is located at the other end thereof, and the exhaust passages (43) are in communication with the air receiving part (42) and an outer side wall of the heat dissipation component (40). The light-emitting module (50) is arranged in the light-emitting module accommodating space (41), and is electrically connected to the power source supply component (10) in a waterproof manner. The light-emitting diode lamp (1) has a good heat dissipation efficiency and good waterproof performance.

Description

LED light fixture

Technical field

The invention relates to the technical field of lamps, and in particular to an active heat dissipation system for greatly enhancing light emitting diodes (Light Emitting) Diode; LED) Light-emitting diodes that are thermally efficient and waterproof.

Background technique

With the new moonlight of technology, Light Emitting The application level of Diode; LED) has also become wider and wider. Light-emitting diodes are used in such products as LED lamps, LED street lamps, LED desk lamps, and various types of display lamps. Since high-power LEDs emit light sources, they are often accompanied by extremely high heat sources. Although LEDs can achieve high brightness, if LEDs cannot effectively reduce or dissipate the heat generated by LEDs, LEDs may be caused. Under high temperature, it may also affect the normal operation of LED and its service life will be relatively reduced due to the influence of high temperature. Therefore, the heat that LEDs cause when applied to lamps is an urgent problem to be solved.

Therefore, in most lighting devices, a heat dissipation module is often provided, and the heat dissipation effect is improved by the improvement of the structure or material properties of the heat dissipation module. However, such passive heat dissipation is not efficient, and because the flow of the ambient gas depends on the heat dissipation efficiency, the heat dissipation is passive, so that the heat source cannot be forcibly and efficiently discharged. In addition, although a fan is used to force the gas to the surface of the LED or the heat dissipation module, the heat source is forcibly discharged. However, the utilization of the fan has not been optimized, so the heat dissipation efficiency of the fan is superior to that of the heat dissipation module alone, but the heat dissipation efficiency is still slightly insufficient.

As mentioned above, the inventor of the invention thought about and designed a light-emitting diode lamp. After years of painstaking research, it improved the existing technology, thereby improving the heat dissipation performance of the LED lamp and greatly improving the light efficiency of the lamp. The service life of the lamps and the implementation of the industry.

technical problem

Based on the above problems of the prior art, an object of the invention is to provide an LED lamp to solve the problem of poor heat dissipation efficiency of the conventional LED lamp.

Technical solution

According to an object of the invention, an LED lamp is provided, which comprises a power supply member, a lamp housing, a fan, a heat sink and a lighting module. One end of the power supply has a power connection. The lamp housing is located at the other end of the power supply member; the lamp housing has a fan receiving space and a heat dissipating space, and the fan receiving space is adjacent to the power supply, and the lamp housing has a plurality of air inlets Connect the outside and the fan to accommodate the space. The fan is disposed in the fan accommodating space, and is electrically connected to the power supply member in a waterproof manner. The heat dissipating component is disposed in the heat dissipating component accommodating space, and the heat dissipating component has a illuminating module accommodating space, a gas receiving portion corresponding to the fan, and a plurality of exhaust passages; the gas receiving portion is located at one end of the heat dissipating component adjacent to the fan, and the illuminating module accommodating space Located at the other end of the heat sink, the exhaust passage communicates with the gas receiving portion and the outer side wall of the heat sink. The light emitting module is disposed in the accommodating space of the light emitting module, and is electrically connected to the power supply member in a waterproof manner.

Preferably, the lamp housing can be a cap structure, and the lamp housing is recessed inwardly adjacent to one end of the power supply member, and a fan receiving space is formed in the recess.

Preferably, the one end of the heat sink adjacent to the recess portion may have a groove corresponding to the recess portion, and the gas receiving portion is disposed on the bottom surface of the groove.

Preferably, the gas receiving portion may be a vertebral body structure that protrudes outward.

Preferably, the outer side wall of the heat dissipating member may be provided with a heat dissipating portion, and the heat dissipating portion may include a plurality of heat dissipating convex portions protruding outward from the heat dissipating member.

Preferably, the communication hole of the exhaust passage located at the outer side wall of the heat sink may be located between the heat dissipation convex portions.

Preferably, the luminaire further comprises a cover covering the opening of the accommodating space of the illuminating module.

Preferably, a waterproof layer is further disposed between the cover body and the heat sink.

Preferably, the luminaire further comprises a reflector, which is located between the illuminating module and the cover.

Preferably, the outer wall of the lamp housing can be recessed inward to form an annular stepped groove, and the luminaire can further comprise a decorative ring disposed on the annular stepped groove.

Preferably, the annular stepped groove ring may be provided with a plurality of heat dissipating member through holes in an array, and the heat dissipating member corresponding to the heat dissipating member through hole may be provided with a plurality of heat dissipating member fixing holes for respectively dissipating heat through the plurality of fixing members. The through hole is fixed to the heat sink fixing hole to fix the heat sink to the lamp housing.

Preferably, the fan can suck the gas into the fan receiving space via the air inlet opening, and the gas is discharged through the gas receiving portion and the exhaust passage through the gas receiving portion and the exhaust passage, and the exhaust passage is disposed outside the lamp through the communication hole of the outer side wall of the heat sink.

Preferably, the light emitting module is electrically connected to the power supply member through the gas receiving portion and the fan receiving space.

Preferably, a waterproof layer is further disposed between the light emitting module and the heat sink.

Beneficial effect

From the above, the LED lamp of the invention has one or more of the following advantages:

(1) The LED lamp of the present invention utilizes the heat dissipation structure of the heat sink itself, and the fan drives the gas into the LED lamp and discharges the LED lamp through the inside of the heat sink, thereby not only effectively improving the heat dissipation efficiency of the LED lamp. It can greatly improve the system light efficiency of LED lamps and the life of lamps.

(2) The light-emitting diode lamp of the present invention forms a waterproof and sealed space by the shielding space of the light-emitting module and the barrier of the cover body, so as to prevent external moisture or moisture from entering, and the light-emitting module is waterproof and electrically connected through the arrangement of the inner and the waterproof layer. The power supply is connected, thereby effectively improving the waterproof performance of the LED lamp.

(3) The light-emitting diode lamp of the present invention can shield the assembled components of the light-emitting diode lamp disposed on the appearance by the arrangement of the decorative ring, thereby effectively improving the appearance.

DRAWINGS

FIG. 1 is a schematic exploded view of an LED lamp of the present invention.

2 is a schematic view showing the combination of the LED lamps of the present invention.

3 is a cross-sectional view of a lamp housing of the LED lamp of the present invention.

4 is a cross-sectional view of a heat sink of the LED lamp of the present invention.

FIG. 5 is a schematic diagram of gas flow of the LED lamp of the present invention.

FIG. 6 is a schematic diagram of electrical connection of a light emitting module of an LED lamp of the present invention.

Embodiments of the invention

In order to facilitate the understanding of the technical features, the contents and advantages of the invention and the efficacies that can be achieved, the invention will be described in detail with reference to the accompanying drawings. And the supplementary manual is not the true proportion and precise configuration after the implementation of the invention. Therefore, the ratio of the subsequent drawings and the configuration relationship cannot be interpreted and the scope of the invention in practice is limited, and is explained in advance.

Embodiments of a light-emitting diode (LED) lamp according to the invention will be described below with reference to the accompanying drawings, and the same components in the following embodiments are denoted by the same reference numerals for ease of understanding.

Please refer to FIG. 1 and FIG. 2 , which are respectively a schematic diagram and a combination diagram of an explosion of the LED lamp of the present invention. The LED lamp 1 of the present invention comprises a power supply member 10, a lamp housing 20, a fan 30, a heat sink 40, a light emitting module 50, a cover 60 and a reflector 70. The power supply member 10 is configured to supply power to the fan 30 and the light emitting module 50 to provide power required for the fan 30 and the light emitting module 50 to operate. The heat dissipating member 40 is configured to absorb heat generated by the operation of the light-emitting module 50 to dissipate heat by the heat dissipation structure of the heat sink 40 itself and the gas flow driven by the fan 30. The lamp housing 20 is intended to cover the exterior of each component and has a channel pin 27 for preventing hot air from remaining between the channel exit or between the lamp housing 20 and the heat sink 40. The cover 60 is used to cover the light emitting module 50 to block moisture or the like from invading the light emitting module 50. The reflector 70 is used to control the light shape and light distribution of the light source.

One end of the power supply member 10 has a power connection portion 11, and the power connection portion 11 can be a standard power connection connector such as E12, E14, E17 or E27. The other end of the power supply member 10 is provided with a power supply member fixing portion 12 for fixing to the globe housing 20. As described above, the globe housing 20 is provided at the other end of the power supply member 10 to be fixed to the power supply fixing portion 12. The lamp housing 20 can be made of a material such as metal or plastic.

The lamp housing 20 has a fan accommodating space 21, a heat dissipating member accommodating space 22, and a plurality of air intake through holes 23, wherein the fan accommodating space 21 is located at one end of the lamp housing 20 adjacent to the power supply member 10, and the heat dissipating member accommodating space 22 is located at the other end of the lamp housing 20, and the air intake opening 23 is arranged in an annular array on the surface of the lamp housing 20 corresponding to the fan housing space 21 to communicate the external and fan housing space 21.

The fan 30 can be fixed in the fan accommodating space 21 by means of screws or the like, and the fan 30 is electrically connected to the power supply member 10 in a waterproof manner to obtain the required electric power, so that the external gas can be carried and sucked through the intake opening 23 to The fan accommodates the space 21. The manner in which the fan 30 is electrically connected to the power supply member 10 in a waterproof manner can be covered by a waterproof glue or other similar waterproof covering to be electrically connected.

The heat dissipating member 40 may be made of a material having good thermal conductivity such as aluminum or copper, and is disposed in the heat dissipating member accommodating space 22 of the lamp housing 20 . The heat sink 40 has a light emitting module housing space 41, a gas receiving portion 42, and a plurality of exhaust passages 43. The gas receiving portion 42 is located at one end of the heat dissipating member 40 adjacent to the fan 30, that is, the gas receiving portion 42 is located at the air outlet of the fan 30, and the illuminating module accommodating space 41 is disposed at the other end of the heat dissipating member 40 for receiving Light module 50. The exhaust passage 43 communicates between the gas receiving portion 42 and the outer side wall of the heat sink 40.

The light emitting module 50 includes at least one light emitting diode (Light Emitting) Diode; LED), a circuit board, and a driver circuit provided on the circuit board, and the like, which are well known to those skilled in the art. The light emitting module 50 is electrically connected to the power supply member 10 in a waterproof manner, and is fixed to and in contact with the wall surface in the light emitting module receiving space 41 of the heat sink 40 to transfer thermal energy to the heat sink 40, and preferably, to emit light. The position of the module 50 is a position corresponding to the gas receiving portion 42. Incidentally, between the light emitting module 50 and the inner wall surface of the illuminating module accommodating space 41, a heat conducting medium such as one of a graphite heat conducting sheet, a heat conducting tape, a thermal conductive paste or a ceramic heat conducting plate may be disposed (not shown) Show) to increase the efficiency or rate at which thermal energy is transferred from the light emitting module 50 to the heat sink 40. In addition, the light-emitting module 50 can further include a carrier plate to carry components such as a light-emitting diode (LED), a circuit board, and the like, so that the light-emitting module 50 can be integrally fixed to the light-emitting module receiving space 41 by using the carrier plate.

The cover body 60 is a transparent cover structure and can be made of a material such as glass or plastic. The cover 60 covers the opening of the illuminating module accommodating space 41. In practical use, the cover 60 can be fixed to the opening of the illuminating module accommodating space 41 by a water-repellent silicone (Silicone). In other words, there is a waterproof layer 90 between the cover 60 and the heat sink 40 (please refer to FIG. 6 ), and thereby the possibility of preventing moisture from entering the light emitting module accommodating space 41 between the cover 60 and the heat sink 40 is achieved. . It should be noted that the reflector 70 can be disposed between the light emitting module 50 and the cover 60. The reflector 70 can be a cup structure to receive the light emitted by the light module 50 and appropriately reflect the light and pass through the cover 60.

Referring to FIGS. 3 and 4, FIG. 3 and FIG. 4 are respectively a schematic cross-sectional view of a lamp housing of the LED lamp of the present invention and a schematic cross-sectional view of the heat dissipating member. Further to the lamp housing 20 and the heat sink 40. The lamp housing 20 is a cap structure, and the lamp housing 20 is recessed inwardly adjacent to one end of the power supply member 10, and a fan receiving space 21 is formed in the recess 24 (as shown in FIG. 3). ). On the other hand, the end of the heat dissipating member 40 adjacent to the recess portion 24 has a recess 44 corresponding to the recess portion 24 (as shown in FIG. 4), and the gas receiving portion 42 is disposed on the bottom surface of the recess 44, and more preferably, the gas receiving portion 42 The vertebral body structure may be outwardly convex to facilitate dispersing the gas blown by the fan 30 to each of the exhaust passages 43. In addition, the outer side wall of the heat sink 40 may be provided with a heat dissipating portion 45 (shown in FIG. 1) composed of a plurality of heat dissipating convex portions arranged in an annular array along the heat dissipating member 40. It is to be noted that the communication hole 431 of the exhaust passage 43 located on the outer side wall of the heat sink 40 is located between the heat dissipation convex portions of the heat dissipation portion 45 to appropriately discharge the gas by the gap between the heat dissipation convex portions. In other words, the exhaust passages 43 are radially arranged inside the heat sink 40 to communicate the gas receiving portions 42 and the outer side walls of the heat sink 40. In addition, the exhaust passage 43 may be provided with a communication hole 431 between each of the heat dissipation convex portions, that is, the number of the exhaust passages 43 corresponds to the number of intervals of the heat dissipation convex portions. Of course, it is also disposed between the heat dissipating convex portions in a manner of spacing several heat dissipating convex portions (for example, two or three), so it should not be limited by the content disclosed in the embodiment, and it can fully meet the practical application. And change it. Regarding the exhaust of the communication hole 431, the globe housing 20 may be further provided with a plurality of exhaust openings 25 corresponding to the communication hole 431 for the gas to smoothly pass through the exhaust opening 25.

Incidentally, the globe housing 20 and the heat sink 40 can be fixed by means of screw locking. In detail, the outer wall of the globe housing 20 may be recessed inwardly to form an annular stepped groove 26, and a plurality of fin through holes 261 are provided in the annular stepped groove 26 in an annular array. On the other hand, the heat sink 40 can be provided with a plurality of heat sink fixing holes 46 corresponding to the heat sink through holes 261. At this time, a plurality of fixing members such as screws are respectively fixed to the heat sink fixing holes 46 through the heat sink through holes 261 to fix the heat sink 40 to the globe housing 20. In consideration of the appearance, the LED lamp 1 may further include a decorative ring 80 and be disposed in the annular stepped groove 26 to prevent the fixing member such as the screw from being exposed by the decorative ring 80 (see FIG. 1). And 2)). The manner in which the decorative ring 80 is fixed to the annular stepped groove 26 can be utilized by a snap or the like, which is well known to those skilled in the art, and will not be further described herein.

Please refer to FIG. 5 , which is a schematic diagram of gas flow of the LED lamp of the present invention. As shown in the figure, when the power supply 10 supplies power to the fan 30 and the light emitting module 50, the light emitting module 50 is driven by the power to emit light to generate light, and the light is emitted to the light through the cover 60 and the reflector 70. The diode lamp 1 is outside. At this time, the light-emitting module 50 transmits thermal energy to the heat sink 40 by direct contact or indirect contact with the heat sink 40 (indirect contact with a heat-conducting medium) due to thermal energy generated during light-emitting, wherein the gas receiving portion 42 The portion of the heat sink 40 between the light emitting module 50 and the portion of the heat sink 40 that is in direct contact with the light emitting module 50 is a main heat energy region.

Further, at the same time, the fan 30 is driven by electric power to start the flow of the gas to suck the air outside the light-emitting diode lamp 1 into the fan accommodation space 21 through the intake opening 23. Next, the fan 30 propels the air into the gas receiving portion 42, that is, directly blows toward the main heat energy region. The gas blown toward the gas receiving portion 42 is uniformly affected to flow outward by the gas receiving portion 42 of the vertebral body structure, and enters the exhaust passage 43. Then, the gas in the exhaust passage 43 is exhausted from the heat dissipation member 40 through the communication hole 431 of the exhaust passage 43 located on the outer side wall of the heat sink 40, and then between the heat dissipation convex portions and the lamp housing through the heat dissipation portion 45. The gap of 20 flows out or is discharged outside the LED lamp 1 and blocks the flow of hot air into the interior of the LED lamp 1 by the channel pin 27 to effectively prevent hot air from remaining near the channel exit or the lamp housing 20 And between the heat sink 40. Incidentally, in actual use, the fan 30 can also be blown out of the intake opening 23 instead of the aforementioned configuration. In other words, the air flowing through the fan 30 causes the gas to enter the LED lamp 1 through the gap between the heat dissipating convex portions of the heat dissipating portion 45 and the lamp housing 20, and then continuously passes through the communication hole 431 and the exhaust passage. 431. The gas receiving unit 42, the fan housing space 21, and the intake opening 23 flow out or are discharged into the LED lamp 1. Therefore, the flow of gas entering through the inlet opening 23 should not be limited.

As a result, the light-emitting diode lamp 1 of the present invention dissipates heat by using the heat-dissipating convex portions of the heat-dissipating portion 45, and further dissipates heat by means of exhaust gas, thereby greatly increasing the heat-dissipating performance of the light-emitting diode lamp 1.

Please refer to FIG. 6 and FIG. 5 , which is a schematic diagram of electrical connections of the light-emitting module of the LED lamp of the present invention. As shown, the light-emitting module 50 is electrically connected to the power supply member 10 in a waterproof manner. The present invention mainly forms the light-emitting module accommodating space 41 provided by the light-emitting module 50 into a completely closed space to isolate the possibility of foreign matter such as moisture, moisture and the like, so that the light-emitting diode lamp 1 can reach the high waterproof level of IP65. . The light emitting module 50 is electrically connected to the power supply member 10 through the gas receiving portion 42 and the fan receiving space 21 .

For example, at least one through hole may be disposed between the light emitting module accommodating space 41 and the fan accommodating space 21, that is, the through hole is a wall surface and gas receiving between the gas receiving portion 42 and the heat sink 40. The portion 42 communicates with the light emitting module accommodating space 41 and the fan accommodating space 21 . At this time, the connecting line of the light emitting module 50 can enter the fan receiving space 21 through the through hole, so that the power supply member 10 can be electrically connected. Then, the waterproof hole can be filled in the through hole to form the waterproof layer 90. Thereby, the light emitting module 50 and the power supply member 10 can be electrically connected to each other, and the gas receiving portion 42 and the fan receiving space 21 can also be performed. Complete isolation.

In addition, when the cover 60 is combined with the opening of the light-emitting module accommodating space 41 of the heat sink 40, the waterproof layer 90 may be coated or provided on the cover 60 or the heat sink 40. After the cover 60 is disposed, the waterproof layer 90 can effectively block foreign matter such as moisture from entering between the cover 60 and the heat sink 40 into the light-emitting module housing space 41.

In summary, the light-emitting diode (LED) lamp of the present invention utilizes a heat dissipating structure of the heat dissipating component itself (such as each heat dissipating convex portion of the heat dissipating portion) to perform a part of heat dissipating, and further drives the gas into the LED lamp through the fan and transmits the heat through the fan. The inside of the piece absorbs the heat absorbed by the light-emitting module and is discharged to the LED lamp, thereby integrating a strong and effective heat dissipation system to improve the heat dissipation efficiency of the LED lamp. Furthermore, the light-emitting diode lamp of the present invention forms a sealed space for blocking the entry of foreign matter such as moisture by the arrangement of the waterproof layer, so as to prevent external moisture or moisture from entering. Effectively improve the waterproof performance of LED lamps.

The above description is only an example and is not intended to limit the invention. Any changes or modifications that come within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

[Main component symbol description]

1: LED light fixture

10: Power supply parts

11: Power connection

12: Power supply fixing part

20: lamp housing

21: Fan accommodation space

22: heat sink accommodation space

23: intake opening

24: depression

25: exhaust opening

26: annular step groove

261: heat sink through hole

27: channel pin

30: fan

40: heat sink

41: Light-emitting module housing space

42: Gas receiving department

43: exhaust passage

431: Connecting hole

44: groove

45: heat sink

46: heat sink fixing hole

50: Light module

60: cover

70: Reflector

80: decorative ring

90: waterproof layer

Claims

An LED light fixture characterized in that it comprises:

a power supply member having a power connection at one end thereof;

a lamp cover housing is disposed at the other end of the power supply member, the lamp cover housing has a fan receiving space and a heat dissipating member receiving space, and the fan receiving space is adjacent to the power supply member. And the lamp housing has a plurality of air inlet openings to communicate the outside with the fan receiving space;

a fan disposed in the fan receiving space and electrically connected to the power supply member in a waterproof manner;

a heat dissipating member disposed in the heat dissipating member accommodating space, the heat dissipating member having a illuminating module accommodating space, a gas receiving portion corresponding to the fan, and a plurality of exhaust passages, wherein the gas receiving portion is located at the heat dissipating member Adjacent to one end of the fan, the light emitting module receiving space is located at the other end of the heat sink, and the exhaust passage communicates with the gas receiving portion and an outer sidewall of the heat sink;

The light emitting module is disposed in the accommodating space of the light emitting module, and is electrically connected to the power supply member in a waterproof manner.
The LED lamp of claim 1 , wherein the lamp housing is a cap structure, and the lamp housing is recessed inwardly adjacent to one end of the power supply member. The fan accommodation space is formed in the depressed portion.
Claims 2 The LED lamp is characterized in that: one end of the heat dissipating member adjacent to the recess portion has a groove corresponding to the recess portion, and the gas receiving portion is disposed on a bottom surface of the recess portion.
The LED lamp of claim 3, wherein the gas receiving portion is a vertebral body structure that protrudes outward.
Claims 1 The light-emitting diode lamp is characterized in that: the outer side wall of the heat dissipating member is provided with a heat dissipating portion, and the heat dissipating portion comprises a plurality of heat dissipating convex portions protruding outward from the heat dissipating member.
Claim 5 The LED lamp is characterized in that a communication hole of the exhaust passage located at an outer sidewall of the heat sink is located between each of the heat dissipation convex portions.
Claims 1 The LED lamp is characterized in that the lamp further comprises a cover covering the opening of the accommodating space of the illuminating module.
The LED lamp of claim 7, wherein a waterproof layer is further disposed between the cover and the heat sink.
Claim 7 The LED luminaire is characterized in that the luminaire further comprises a reflector, which is located between the illuminating module and the cover.
The LED lamp of claim 1 , wherein the outer wall of the lamp housing is inwardly recessed to form an annular stepped groove, and the lamp further comprises a decorative ring disposed on the annular stepped groove.
Claim 10 The light-emitting diode lamp is characterized in that the annular stepped groove is provided with a plurality of heat dissipation member through holes in an annular array, and the heat dissipation member is provided with a plurality of heat dissipation member fixing holes corresponding to the heat dissipation member through hole. And fixing the heat dissipating member to the lamp housing by a plurality of fixing members respectively passing through the heat sink through holes.
The LED lamp of claim 1, wherein the fan draws gas into the fan housing space via the intake opening, the gas passing through the gas receiving portion and the exhaust passage And the communication hole of the exhaust passage located at the outer side wall of the heat sink is discharged outside the lamp.
The LED lamp of claim 1 , wherein the light emitting module is electrically connected to the power supply via the gas receiving portion and the fan receiving space.
The LED lamp of claim 13, wherein a waterproof layer is further disposed between the light emitting module and the heat sink.