KR20180064633A - Lighting device and radiator frame - Google Patents

Abstract

The present invention relates to a lighting device and a radiator frame which can improve the productivity and strength of a product while enhancing the heat generating performance by facilitating fastening between components. The lighting device includes: a module substrate on which at least one light emitting device can be mounted; a power supply module connected to the module substrate to drive the light emitting device; a radiator frame provided with a module substrate rail portion on one side thereof, to which the module substrate is slidably coupled, having a shape corresponding to a lateral side of the module substrate to support a rear surface of the module substrate, and provided with a power supply module rail portion on the other side thereof, to which the power supply module is slidably coupled, having a shape corresponding to a lateral shape of the power supply module to support a rear surface of the power supply module, in which the radiator frame is formed of a heat dissipation material for transferring heat generated from the light emitting device to the outside; and a cover slidably coupled to the radiator frame to protect an upper surface of the module substrate and an upper surface of the power supply module, formed of a transparent material to transmit the light generated from the light emitting device, and having a pipe shape with a substantially circular section.

Description

Lighting device and radiator frame

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus and a heat dissipating frame that can improve the productivity and strength of a product by facilitating fastening between parts, and improve the heat generating performance.

A light emitting diode (LED) is a kind of semiconductor device that can emit light of various colors by forming a light emitting source through the formation of a PN diode of a compound semiconductor. Such a light emitting device has a long lifetime, can be reduced in size and weight, and can be driven at a low voltage. In addition, these LEDs are resistant to impact and vibration, do not require preheating time and complicated driving, can be packaged after being mounted on various types of boards or lead frames, and can be modularized for various purposes, unit or the like.

Conventional LED lighting apparatuses have a problem in that a high temperature heat is intensively generated in a light emitting element module substrate on which a plurality of LEDs are mounted, that is, a PCB is subjected to thermal stress, , Deterioration of the lifespan of the parts, breakage of the wiring layer due to breakage, and substrate warpage have inevitably occurred.

In order to solve the high-temperature heat and heat accumulation phenomenon of such LED lighting apparatus, conventionally, various heat dissipating members fastened by using various fixtures such as a screw, a fixing pin and the like have been provided.

However, the conventional module substrate and the heat dissipating member are manufactured by a method in which they are fixed by fixing members, and the fastening time and process for fastening and disassembling the fixing member are cumbersome, and a separate tool such as a screwdriver or a wrench is required. And the module substrate is brought into thermal contact with the heat radiating member only in the vicinity of the fixing member in a close contact manner and the remaining portions are not widened in contact with each other,

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a sliding type sliding door, a heat sink frame, a cover and a power supply module, This makes it possible to reduce product production time and cost, and it is possible to make surface contact between the module board and the heat radiating frame so that the heat transfer area can be increased to greatly improve the heat radiation performance. And to provide a lighting apparatus and a heat radiation frame that can reduce the working time and cost further and can greatly reduce the unit cost of a product by using a reflective ink layer formed on the surface by a printing method. However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the present invention, a lighting apparatus is provided. The illumination device includes: a module substrate on which at least one light emitting element can be mounted; A power supply module connected to the module substrate to drive the light emitting device; A module substrate rail portion having a shape corresponding to a side surface of the module substrate is formed on one surface of the module substrate in a sliding manner so as to support the rear surface of the module substrate and the power supply module is fastened to the other surface in a sliding manner A power supply module rail portion having a shape corresponding to a side surface of the power supply module so as to support the rear surface of the power supply module is formed and a heat dissipation frame formed of a heat dissipation material for transferring heat generated from the light emitting device to the outside ; And a light-transmissive material which is fastened to the heat-dissipating frame in a sliding manner to protect an upper surface of the module substrate and an upper surface of the power supply module, and transmits light generated from the light- And a cover formed thereon.

In the lighting apparatus, the heat radiating frame may include a frame body having a surface corresponding to the module substrate so as to be in thermal contact with the rear surface of the module substrate, the overall length of which is long; A first module substrate rail part formed at one side of the frame body so that one side of the module substrate can be slidably inserted; And a second module substrate rail portion facing the first module substrate rail portion on the other side of the frame body so that the other side of the module substrate can be slidably inserted.

In the lighting apparatus, the power supply module includes: a power supply module main body connected to the module substrate to supply power to the light emitting device to drive the light emitting device; And a power supply module bracket accommodating the power supply module main body on the inner side and having wings on both sides thereof so as to be slidably coupled to the heat dissipation frame, A first power supply module rail formed on one side of the frame body so that a wing portion of the frame body can be slidably inserted; And a second power supply module part formed on the other side of the frame body so as to face the first power supply module part so that the wings of the other side of the power supply module bracket can be slidably inserted therein .

In the lighting apparatus, the power supply module bracket may be formed so that one side of the bracket corresponding to the inside of the cover is the same as the inside shape of the cover.

In the lighting apparatus, the cover may include: a first protrusion protruding from the inside of the cover so as to be slidably coupled with the radiating frame; And a second protrusion formed on the inner side of the cover so as to protrude in a direction perpendicular to the first protrusion so as to be slidably engaged with the heat radiating frame, A first cover rail formed on both sides of the frame body so as to be inserted; And a second cover rail formed on both sides of the frame body in a direction perpendicular to the first cover rail so that the second protrusions can be slidably inserted.

The lighting device may further include an end bracket on which the screw hole is formed so that the cover and the heat radiating frame can be fastened to the heat radiating frame by screws.

In the illuminating device, the heat radiating frame may be formed with a screw fastening portion between the first cover rail and the second cover rail so that the end bracket can be screwed.

In the illumination device, the first module substrate part and the second module substrate part are formed to protrude outwardly of the frame body, respectively, and are positioned inside the cover to reflect light emitted from the light emitting device And a reflection blade having a reflection surface formed on an upper surface thereof.

In the lighting device, the heat radiating frame may be formed with a ventilation window or a radiating fin on a rear surface thereof so as to radiate heat generated from the light emitting element to the outside.

In the lighting apparatus, the module substrate may have a reflective ink layer printed on a top surface thereof in a printing manner, and a plurality of the light emitting devices may be arranged long in the longitudinal direction.

According to one aspect of the present invention, there is provided a heat radiation frame for a lighting apparatus. The heat radiating frame for an illumination device includes: a frame body formed as a whole in a longitudinal direction; A module substrate formed on one surface of the frame body in a shape corresponding to a side surface of the module substrate so that a module substrate on which at least one light emitting device can be mounted is coupled in a sliding manner to support a rear surface of the module substrate, part; A power supply module connected to the module substrate for driving the light emitting device is coupled to the other side of the frame body in a shape corresponding to a side surface of the power supply module so as to support a rear surface of the power supply module, A power supply module rail formed; And a cover which is formed of a light-transmitting material and is formed in a pipe shape having a circular cross section as a whole to transmit the light generated from the light emitting device is slidably coupled to protect the upper surface of the module substrate and the upper surface of the power supply module And a cover rail formed on both sides of the frame body in a shape corresponding to a protrusion formed to protrude from the inside of the cover.

In the heat radiating frame for a lighting device, the frame body may be formed of a heat-dissipating material so as to transmit heat generated from the light emitting device to the outside, wherein a surface corresponding to the module substrate is formed so as to be in thermal contact with the rear surface of the module substrate .

In the heat radiating frame for a lighting apparatus, a ventilating window or a radiating fin may be formed on a rear surface of the frame body on which the module substrate rail is formed so that heat generated from the light emitting element can be discharged to the outside.

According to an embodiment of the present invention as described above, both the module substrate, the heat radiation frame, the cover, and the power supply module can be easily fastened, so that the fastening time and cost can be reduced, Can be reduced and the heat radiation performance can be greatly improved by increasing the heat transfer area and the operation time and cost can be further shortened and the cost of the product can be greatly reduced by using the reflection ink layer And a heat radiating frame. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view showing a lighting apparatus according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing the illumination device of Fig. 1;
Fig. 3 is an exploded perspective view of the illuminating device of Fig. 1; Fig.
Fig. 4 is an enlarged perspective view showing a part of the illumination device of Fig. 3 in an enlarged manner. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term " and / or " includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures, when the element is turned over, the elements depicted as being on the upper surface of the other elements are oriented on the lower surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise " and / or " comprising " when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

FIG. 1 is a perspective view showing a lighting apparatus 100 according to an embodiment of the present invention. FIG. 2 is a sectional view showing the lighting apparatus 100 of FIG. 1, Fig.

1 to 3, a lighting apparatus 100 according to an embodiment of the present invention includes a module substrate 10, a power supply module 20, a heat radiating frame 30, And may include a cover 40.

For example, as shown in FIGS. 1 to 3, the module substrate 10 includes at least one light emitting device, that is, a printed circuit board (PCB) ). More specifically, the module substrate 10 can be made of a mixed material having suitable mechanical strength for supporting the light emitting device and other components, and electrically connected thereto.

More specifically, the module substrate 10 may be formed of a resin, a glass, a silicone resin composition, a modified epoxy resin composition, a modified silicone resin composition, a polyimide resin composition, a modified polyimide resin composition, a polyphthalamide (PSA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenol resin, acrylic resin, PBT resin, Epoxy Mold Compound, white silicone, PSR (photoimageable solder resist) A substrate of various organic or inorganic materials can be applied.

In addition, the module substrate 10 may be an insulating substrate of a printed circuit board (PCB) or a flexible printed circuit board (FPCB) of a thin flexible material.

In addition, the module substrate 10 may be formed of an insulated metal such as aluminum, copper, zinc, tin, lead, gold, silver, or the like, and may be a perforated or bent lead frame or plate.

Further, as shown in Fig. 2, the module substrate 10 may be formed with a reflective ink layer 11 that is printed on the upper surface by a printing method. Here, the reflective ink layer 11 is formed of a reflective paint component such as white or silver series titanium oxide, silicon dioxide, titanium dioxide, zirconium dioxide, potassium titanate, alumina, aluminum nitride, boron nitride, mullite, Light-reflecting materials such as a series or a metal-based component can be contained. However, the present invention is not limited to this, and a reflective paint or pigment having high reflectance may be included. Therefore, the unit cost of the product can be greatly reduced by using the reflective ink layer 11 formed on the surface of the printing method in comparison with the conventional injection method or the like.

1 to 3, the power supply module 20 may be connected to the module substrate 10 to drive the light emitting device. For example, the power supply module 20 may be a ballast in which a coil is wound around an iron core in which a thin silicon steel plate is stacked. Therefore, it is possible to generate electricity of a constant voltage in the ballast, to light the light emitting element, and to prevent excessive current from flowing after the light is turned on, thereby securing the stability of light emission of the light emitting element.

Fig. 4 is an enlarged perspective view showing a part of the illumination device 100 of Fig. 3 in an enlarged manner.

1 to 4, the heat dissipating frame 30 includes a heat dissipating frame 30 having a module substrate 10 mounted on one side thereof to be coupled to the module substrate 10 in a sliding manner to support the rear surface of the module substrate 10, The power supply module 20 is mounted on the other surface of the module substrate in a sliding manner so as to support the rear surface of the power supply module 20, A power supply module rail part 32 having a shape corresponding to a side surface of the light emitting device and a heat dissipation structure formed of a heat dissipation material to transmit heat generated from the light emitting device to the outside.

For example, the heat dissipating frame 30 may be formed of a metal material such as aluminum, copper, zinc, tin, lead, gold, silver, Cover 40 and other components, and may be made of a material having suitable mechanical strength for thermal connection therewith.

1 to 4, the heat dissipating frame 30 has a surface corresponding to the module substrate so as to be in thermal contact with the rear surface of the module substrate 10, and is formed long in the longitudinal direction as a whole A first module substrate rail part 31-1 and a module substrate 10 formed on one side of the frame body 33 so that one side of the module substrate 10 can be slidably inserted, And a second module substrate rail part 31-2 formed on the other side of the frame body 33 so as to face the first module substrate rail part 31-1 so that the other side of the frame body 33 can be slidably inserted .

Therefore, since the heat radiating frame 30 can be fastened to the module substrate 10 in a sliding manner by using the first module substrate rail part 31-1 and the second module substrate rail part 31-2 It is possible to easily fasten the module substrate 10 and the heat radiation frame 30 in a sliding manner without a separate fixture, thereby reducing the time and cost of the fastening, thereby reducing the production time and cost of the product, Surface contact can be made between the front surface of the heat sink frame 10 and the heat radiating frame 30, and the heat transfer area can be increased to greatly improve the heat radiation performance.

For example, the heat radiating frame 30 is formed to protrude outwardly of the frame body 33 to the first module substrate rail part 31-1 and the second module substrate rail part 31-2, respectively, And a reflection wing 60 positioned inside the cover 40 and having a reflecting surface formed on the upper surface thereof to reflect light generated from the light emitting device.

Therefore, the light generated from the light emitting device can be reflected upward through the reflection wing 60, thereby improving the luminous efficiency and widening the irradiation area.

1 to 4, the power supply module 20 includes a power supply module main body 21 connected to the module substrate 10 to supply power to the light emitting device to drive the light emitting device, And a power supply module bracket 22 accommodating the power supply module main body 21 inside and having wings 22a formed on both sides thereof so as to be slidably coupled to the heat dissipation frame 30, The frame 30 includes a first power supply module rail 32-1 formed on one side of the frame body 33 so that the wing portion 22a on one side of the power supply module bracket 22 is slidably inserted, And the second power supply module rail portion 32-1 formed on the other side of the frame body 33 so that the wing portion 22a of the other side of the power supply module bracket 22 can be slidably inserted. And a power supply module rail portion 32-2.

At this time, the first module substrate rail part 31-1 and the first power supply module rail part 32-1 are formed facing each other with respect to the frame body 33, and the second module substrate rail part 31-2 And the second power supply module rail 32-2 may be formed to face each other with respect to the frame body 33. One side of the power supply module bracket 22 corresponding to the inside of the cover 40 is formed to be the same as the inside shape of the cover 40 to support the cover 40.

Accordingly, the power supply module 20 has the wing portions 22a formed on both sides of the power supply module bracket 22, the first power supply module rail portion 32-1, and the second power supply module rail portion 32 -2), the power supply module 20 and the heat dissipation frame 30 can be easily fastened in a sliding manner without a separate fixture, so that the fastening time and cost It is possible to reduce the production time and cost of the product and to make surface contact between the power supply module 20 and the heat radiating frame 30 so that the heat generated by the power supply module 20 It can be easily released.

As shown in Figs. 1 to 4, the cover 40 is coupled to the heat radiating frame 30 in a sliding manner to protect the module substrate 10 and the power supply module 20, And may be formed in a pipe shape having a circular cross section as a whole.

More specifically, the cover 40 includes a first protruding portion 41 and a heat dissipating frame 30, which are formed so as to protrude from the inside of the cover 40 so as to be able to be engaged with the heat dissipating frame 30 in a sliding manner, And a second protrusion 42 protruding in a direction perpendicular to the first protrusion 41 on the inner side of the cover 40 so as to be fastened with the first protrusion 41. [ The first cover rail portion 34 and the second projection portion 42 formed on both side surfaces of the frame body 33 are slidably inserted into the heat sink frame 30 so that the first protruding portion 41 can be slidably inserted. The second cover rail part 35 may be formed on both sides of the frame body 33 so as to be perpendicular to the first cover rail part 34. [

Therefore, the cover 40 can be mounted on the heat radiating frame 30 in a sliding manner by using the first protruding portion 41, the second protruding portion 42, the first cover rail portion 34 and the second cover rail portion 35, The cover 40 and the heat dissipating frame 30 can be easily fastened by a sliding method without a separate fixing device, so that the fastening time and cost can be reduced, thereby reducing the production time and cost of the product can do.

1 to 4, the cross-sectional shape of the heat dissipating frame 30 is formed in a very complicated shape, and can be produced at a very low cost through an extrusion process using aluminum, magnesium, zinc or the like. Such complex shapes can greatly improve strength, durability and heat dissipation.

1 to 4, a lighting apparatus 100 according to one embodiment of the present invention includes a cover 40 and a heat radiating frame 30, And an end bracket 50 on which the threaded hole 51 is formed. At this time, the heat dissipating frame 30 may be formed with a screw coupling part 36 between the first cover rail part 34 and the second cover rail part 35 so that the end bracket 50 can be screwed .

More specifically, the threaded portion 36 can be threaded on the inner side so that the screw B can be fastened. On the other hand, when the screw B is a tapping screw, a thread may not be formed on the inner surface.

Therefore, the illumination device 100 according to one embodiment of the present invention can be cut and used in a predetermined length in the longitudinal direction according to a required specification, a use environment, etc., and the end bracket 50 described above is attached to the cut surface It can be tightened by screwing to improve aesthetics and protect internal parts from external foreign matter.

1 to 4, the lighting apparatus 100 according to one embodiment of the present invention includes a heat sink 30 formed on the rear surface of the heat radiating frame 30, a heat sink fin, and various claw- Various types of parts can be additionally installed.

While the present invention has been described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Module substrate
20: Power supply module
30: heat radiating frame
40: cover
100: Lighting device

Claims (13)

A module substrate on which at least one light emitting element can be mounted;
A power supply module connected to the module substrate to drive the light emitting device;
A module substrate rail portion having a shape corresponding to a side surface of the module substrate is formed on one surface of the module substrate in a sliding manner so as to support the rear surface of the module substrate and the power supply module is fastened to the other surface in a sliding manner A power supply module rail portion having a shape corresponding to a side surface of the power supply module so as to support the rear surface of the power supply module is formed and a heat dissipation frame formed of a heat dissipation material for transferring heat generated from the light emitting device to the outside ; And
The light emitting module is formed of a light transmitting material, which is fastened to the heat dissipating frame in a sliding manner to protect the upper surface of the module substrate and the upper surface of the power supply module, and transmits light generated from the light emitting device. Cover;
. The method according to claim 1,
The heat-
A frame body having a surface corresponding to the module substrate so as to be in thermal contact with the rear surface of the module substrate, the frame body being formed as a whole long in the longitudinal direction;
A first module substrate rail part formed at one side of the frame body so that one side of the module substrate can be slidably inserted; And
A second module substrate rail portion formed on the other side of the frame body so as to face the first module substrate rail portion so that the other side of the module substrate can be slidably inserted;
. 3. The method of claim 2,
The power supply module includes:
A power supply module main body connected to the module substrate to supply power to the light emitting device to drive the light emitting device; And
And a power supply module bracket accommodating the power supply module main body and having wings on both sides so as to be slidably coupled to the heat dissipation frame,
The heat-
A first power supply module rail part formed at one side of the frame body so that a wing part on one side of the power supply module bracket can be slidably inserted; And
A second power supply module part formed on the other side of the frame body so as to face the first power supply module part so that the wings of the other side of the power supply module bracket can be slidably inserted;
Further comprising: The method of claim 3,
Wherein the power supply module bracket is formed so that one side surface of the power supply module bracket corresponding to the inside of the cover is the same as the inside shape of the cover. 3. The method of claim 2,
The cover
A first protrusion protruding from the inside of the cover so as to be fastened to the heat radiating frame in a sliding manner; And
And a second protrusion formed on the inner side of the cover so as to protrude in a direction perpendicular to the first protrusion so as to be fastened to the heat dissipation frame in a sliding manner,
The heat-
A first cover rail formed on both side surfaces of the frame body so that the first protrusions can be slidably inserted; And
A second cover rail formed on both sides of the frame body in a direction perpendicular to the first cover rail so that the second protrusions can be slidably inserted;
Further comprising: 6. The method of claim 5,
An end bracket on which the screw holes are formed so that the cover and the heat radiation frame can be fastened to the heat radiation frame by screws;
Further comprising: The method according to claim 6,
The heat-
Wherein a screw fastening portion is formed between the first cover rail portion and the second cover rail portion so that the end bracket can be screwed. 3. The method of claim 2,
The heat-
The first module substrate part and the second module substrate part, the first module substrate part and the second module substrate part being formed to protrude in the outer direction of the frame body and to be positioned on the top surface so as to reflect light generated in the light emitting device, A reflective blade having a reflective surface;
Further comprising: The method according to claim 1,
The heat-
Wherein a ventilation window or a radiating fin is formed on the rear surface so as to discharge heat generated from the light emitting element to the outside. The method according to claim 1,
Wherein the module substrate comprises:
Wherein a reflective ink layer to be printed on the upper surface is printed, and a plurality of the light emitting elements are arranged and arranged in the longitudinal direction. A frame body formed to be elongated in the longitudinal direction as a whole;
A module substrate formed on one surface of the frame body in a shape corresponding to a side surface of the module substrate so that a module substrate on which at least one light emitting device can be mounted is coupled in a sliding manner to support a rear surface of the module substrate, part;
A power supply module connected to the module substrate for driving the light emitting device is coupled to the other side of the frame body in a shape corresponding to a side surface of the power supply module so as to support a rear surface of the power supply module, A power supply module rail formed; And
A cover which is formed of a light-transmitting material and is formed in a pipe shape having a circular cross-section as a whole to transmit light generated from the light-emitting device is slidably coupled to protect an upper surface of the module substrate and an upper surface of the power supply module, A cover rail formed on both sides of the frame body to correspond to protrusions formed to protrude from the inside of the cover;
And a heat radiating frame for a lighting device. 12. The method of claim 11,
The frame body includes:
Wherein the module substrate has a surface corresponding to the module substrate so as to be in thermal contact with the rear surface of the module substrate and is formed of a heat dissipation material so as to transmit heat generated from the light emitting device to the outside. 12. The method of claim 11,
The frame body includes:
And a ventilation window or a radiating fin is formed on a rear surface of the module substrate rail portion so as to radiate heat generated from the light emitting device to the outside.

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