KR101833223B1 - Lighting device - Google Patents

Abstract

An embodiment of the present invention relates to a lighting apparatus, comprising: a light emitting module unit; A heat dissipation member disposed on the light emitting module section; A heat radiating fan disposed on the heat radiator; And a housing for housing the light emitting module part, the heat discharging body and the heat radiating fan, wherein the housing includes an air inlet and an air outlet, the sectional area of the air inlet is larger than the sectional area of the air outlet, And the air passage connected to the air inlet and the air passage connected to the air outlet are separated from each other by the partition wall in the housing and the heat radiation fan.

Description

LIGHTING DEVICE

An embodiment of the invention relates to a lighting device.

Light emitting diodes (LEDs) are a type of semiconductor devices that convert electrical energy into light. The light emitting diode has advantages of low power consumption, semi-permanent lifetime, fast response speed, safety, and environmental friendliness compared with conventional light sources such as fluorescent lamps and incandescent lamps. Accordingly, much research has been carried out to replace an existing light source with a light emitting diode, and a light emitting diode has been increasingly used as a light source for lighting devices such as various liquid crystal displays, electric sign boards, and street lights used in indoor and outdoor.

However, when the LED is turned on, much heat is generated, and when the heat can not be smoothly discharged, the lifetime of the LED is shortened, the illuminance is decreased, and the quality characteristic is significantly deteriorated. Therefore, an advantage of the LED lighting device is that the heat dissipation of the LED is smooth.

An embodiment of the present invention is to solve the conventional problems as described above, and provides an illumination device having excellent heat radiation efficiency.

In addition, the embodiment provides an illumination device in which the illuminance and lifetime of the light source used in the illumination device are maximized and the quality characteristic is remarkably improved.

In an embodiment, the illuminating device comprises a light emitting module part; A heat dissipation member disposed on the light emitting module section; A heat radiating fan disposed on the heat radiator; And a housing for housing the light emitting module part, the heat discharging body, and the heat radiating fan, wherein the housing includes an air inlet and an air outlet, and the area of the air inlet may be larger than the area of the air outlet.

In another embodiment, the illumination device includes a light emitting module portion; A heat dissipation member disposed on the light emitting module section; A heat radiating fan disposed on the heat radiator; An upper case covering the heat dissipating fan; And a lower case coupled to the upper case and fixing the light emitting module part, wherein the lower case has an air inlet and an air outlet, and the area of the air inlet may be larger than the area of the air outlet.

In addition, the air inlet and the air outlet may be disposed on a surface of the lower case in a direction in which light of the light emitting module is emitted.

In addition, the air inlet and the air outlet may be disposed at the rim of the lower case.

In addition, the air inlet may be disposed at the center of the lower case, and the air outlet may be disposed at an edge of the lower case.

In addition, the air inlet may be disposed closer to the center of the lower case than the air outlet.

In addition, the air inlet of the lower case may be oriented toward the light emitting direction of the light emitting module, and the air outlet may be directed to the outer periphery of the lower case.

In addition, the air inlet and the air outlet may be arranged alternately.

Also, the air inlet of the lower case may lead to a space between the upper case and the upper part of the heat radiating fan, and the air outlet may lead to a space between the lower part of the radiating fan and the radiator.

The air passage leading to the air inlet and the air passage leading to the air outlet may be separated from each other by the partition wall of the upper case and the heat radiating fan.

According to the embodiment of the present invention, the heat radiation efficiency of the lighting apparatus is remarkably increased.

Further, according to the embodiment of the present invention, the illuminance and lifetime of the light source are maximized, and the quality characteristic is remarkably improved.

In addition, according to the embodiment of the present invention, in a recessed type lighting apparatus embedded in a ceiling or a wall, effective heat exchange with outside air can be achieved.

1 shows a cross-sectional perspective view of a lighting device according to an embodiment of the present invention.
2 shows a heat-dissipating fan of a lighting device according to an embodiment of the present invention.
3 shows a bottom plan view of a lighting device according to another embodiment of the present invention.
Fig. 4 shows a cross-sectional view taken along line AA in Fig.
5 shows a cross-sectional view of the BB line of Fig.
6 shows a cross-sectional view of the CC line of Fig.
7 shows a plan view of the DD line of Fig.
8 shows a cross-sectional view of a lighting device according to another embodiment of the present invention.
Figure 9 shows various embodiments of the air outlet and air inlet arrangement of the lighting device of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In the drawings, the thickness and size of each layer are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

In the description of embodiments according to the present invention, it is to be understood that where an element is described as being formed "on or under" another element, On or under includes both the two elements being in direct contact with each other or one or more other elements being indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

1 is a cross-sectional perspective view of a lighting apparatus according to an embodiment of the present invention.

The lighting apparatus 100 according to an embodiment of the present invention includes a light emitting module unit 110, a heat emitting body 120 that is bonded to the light emitting module unit 110 and has a heat radiating plate around the outer surface thereof, An upper case 150 that covers the heat dissipating fan 130 and a heat dissipating fan 130 that is disposed inside the upper case 150 and is electrically connected to the heat dissipating fan 130 and the LED mounting board 112 A driving unit 140 for supplying power and a lower case 160 for fixing the light emitting module unit 110 to the upper case 150.

Each component will be described in detail as follows.

≪ Light emitting module part &

The light emitting module unit 110 may include one or more LEDs 111 and an LED mounting substrate 112 on which one or more LEDs 111 are mounted. A plurality of LEDs 111 may be arranged on the LED mounting substrate 112, and the number and arrangement of the LEDs 111 arranged may be arbitrarily adjusted according to the required illuminance. The light emitting module unit 110 may employ a configuration in which a large number of LEDs are focused to facilitate handling and mass production.

The LED mounting substrate 112 may be a printed circuit pattern on an insulator and may be a printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB And a COB (Chips On Board) type that can directly bond an unpackaged LED chip on a printed circuit board can be used. In addition, the substrate may be formed of a material that efficiently reflects light, or may be formed of a color whose surface is efficiently reflected, for example, white, silver, or the like.

The LED 111 mounted on the substrate may be a red, green, blue, or white light emitting diode that emits red, green, blue, or white light, respectively, but is not limited thereto.

<Heat radiator>

The heat discharging body 120 may be disposed on the light emitting module unit 110 to conduct heat generated by the light emitting module unit 110 and discharge the heat.

The heat discharging body 120 may have a plurality of heat radiating fins on its surface. The plurality of radiating fins may be arranged radially along the surface of the heat discharging body 120. The shape of the heat discharging body 120 increases the surface area to improve the heat radiation efficiency of the heat discharging body 120.

The heat discharging body 120 is configured such that the air injected to the heat discharging body 120 through the heat radiating fan 130 passes through the surface of the heat discharging body 120 in relation to the heat radiating fan 130 and the lower case 160 And a radiating fin arranged in a predetermined direction so as to be discharged to an air outlet of the lower case 160. For example, the radiating fin of the heat discharging body 120 may be arranged in a direction perpendicular to the direction of the air blown by the heat radiating fan 130 and in a direction toward the air outlet of the lower case 160.

The heat discharging body 120 may be formed of a metal material or a resin material having excellent heat dissipation efficiency, but the present invention is not limited thereto. For example, the material of the heat sink 120 may include at least one of aluminum (Al), nickel (Ni), copper (Cu), silver (Ag), and tin (Sn).

Although not shown in the drawing, a heat sink may be disposed between the light emitting module 110 and the heat sink 120. The heat sink may be formed of a thermally conductive silicone pad or a thermally conductive tape having an excellent thermal conductivity, and the heat generated by the light emitting module unit 110 may be effectively transmitted to the heat sink 120.

<Heat dissipation fan>

2 shows a heat-dissipating fan 130 of a lighting device 100 according to an embodiment of the present invention.

The heat radiating fan 130 is disposed on the heat discharging body 120 and can perform forced convection of external air in the lighting apparatus 100 to cool the heat in the lighting apparatus 100.

A power source is applied to the lighting apparatus 100 to illuminate the light in the light emitting module unit 110, and a high temperature is generated when light is emitted. Accordingly, at the same time when the power is supplied, power is also applied to the heat-dissipating fan 130, so that the heat-dissipating fan 130 can operate. Alternatively, the heat-radiating fan 130 may be operated only when the temperature of the heat-sensing sensor in the lighting apparatus 100 becomes equal to or higher than a predetermined temperature.

When the heat-dissipating fan 130 operates, external air is sucked through an air inlet of the lower case 160 to be described later, and the sucked air passes through the heat-dissipating fan 130 and passes through the heat- And the hot air can be discharged to the outside through the air outlet of the lower case 160.

In a specific embodiment, the illumination device 100 may be MR16, the outer diameter of the MR16 may be 50 mm, and the diameter of the heat-dissipating fan 130 may be 30 mm. The heat dissipator 120 may be configured to have a maximum size for heat dissipation and the heat dissipator 120 may have a larger diameter than the heat dissipating fan 130, Lt; / RTI &gt;

Accordingly, although direct air injection of the heat dissipating fan 130 can be performed only on a part of the surface area of the heat dissipating member 120, the air injected on all the surfaces of the heat dissipating member 120 The arrangement of the radiating fins can be specified so as to pass therethrough.

The heat radiating fan 130 may have a bolt insertion hole 131 as shown in FIG. 2 on the outside of the heat radiating fan 130 so as to be combined with the upper case 150 to be described later.

<Upper Case and Lower Case>

The upper case 150 may cover the outer side of the heat dissipating fan 130 and may be coupled to the lower case 160 to create an air passage for allowing the air introduced into the lighting apparatus 100 to be discharged along a predetermined path have.

A terminal 141 for power supply may be disposed on the outer side of the upper case 150 and electrically connected to the heat radiating fan 130 and the light emitting module 110 in the upper case 150, And a driving unit 140 for supplying power to the heat-dissipating fan 130 and the light-emitting module unit 110 may be disposed.

The driving unit 140 may include various electronic devices for driving the LEDs mounted on the PCB. At this time, a terminal 141 is formed on the upper surface of the PCB, and is partially exposed through the rear cover to be partially exposed. The exposed portion can be coupled to the terminal coupling groove and electrically connected.

The terminal 141 of the exposed portion may be a pin-shaped (shown as two terminals in the figure) mounted on the rear end of the upper case 150, but the present invention is not limited thereto and may be an external power source And a rectifier or a condenser may be installed in the interior of the lamp) as an illumination device of the present invention.

The upper case 150, the heat radiating fan 130 and the lower case 160 include a lower case 160, a heat radiating fan 130, a radiator 120, a light emitting module part 110 Are assembled without fastening, the upper case 150 is covered, and the positions of the components can be fixed and coupled using two bolts.

When the components are coupled, the lower case 160 can catch the outer portion of the light emitting module 110 and fix it together with other components. In addition, the lower case 160 may be provided with a space in which the light emitting module unit 110 can be housed, and the light emitting module unit 110 may be disposed in the receiving space of the lower case 160.

The lower case 160 may have an air inlet and an air outlet in the direction of the illumination area illuminated by the illumination device 100. [ The air inlet and the air outlet are configured and arranged independently of each other. The air inlet is used for introducing outside air into the lighting apparatus 100, and the air outlet is used for discharging air that has undergone heat exchange in the lighting apparatus 100 Can be used.

The air outside the lighting apparatus 100 is guided to the upper case 150 and the heat dissipating fan 130 through the air inlet of the lower case 160. In the lighting apparatus 100 according to an embodiment of the present invention, And is sucked into the heat-dissipating fan 130 by the operation of the heat-dissipating fan 130 and is injected into a space between the lower part of the heat-dissipating fan 130 and the heat-dissipating body 120. The injected air passes through the surface of the heat discharging body 120 and is heat exchanged to cool the heat discharging body 120 and then be discharged through the air outlet of the lower case 160.

The cross-sectional area of the air inlet in the lighting device 100 may be designed to be larger than the cross-sectional area of the air outlet. According to Equation (1), when the volume flow rate of the air introduced into the lighting apparatus by the heat radiating fan is constant, the flow rate becomes slower as the cross-sectional area of the passage through which air passes is larger.

Equation 1: Volumetric flow rate = cross sectional area X Flow rate of fluid

Therefore, the flow rate of the air introduced into the air inlet is slowed down and the flow rate of the air discharged to the air outlet is increased.

Dust entering the interior of a lighting device is a major factor in quality deterioration, and it is up to the size of the flow rate to move a certain amount of dust. Accordingly, if the cross-sectional area of the air inlet is designed to be larger than the cross-sectional area of the air outlet so as to slow the flow rate of the incoming air and increase the flow rate of the outflow air, It can be exported quickly.

The upper case 150 or the lower case 160 may have a partition wall for separating the air inflow path through the air inflow port and the air outflow path through the air inflow port.

When the lighting apparatus 100 according to an embodiment of the present invention is used embedded in a wall or a ceiling, since the air inlet and the air outlet are present in the external exposed portion rather than the embedded portion of the lighting apparatus 100, Can be effectively introduced and discharged.

A lens 170 may be disposed on the lower case 160 and the lens 170 may be formed on the upper portion of each LED to collect light or scatter / focus the light emitted from the LED at a predetermined angle. The lens 170 distributes / converges the light so as to obtain light of a desired shape and protects the LED from impact.

3 shows a bottom plan view of a lighting device 300 according to another embodiment of the present invention. A bottom plan view of the illumination device 300 of FIG. 3 may also be a bottom plan view of the illumination device 100 according to an embodiment of the invention of FIG.

The lighting apparatus 300 according to another embodiment of the present invention includes a light emitting module unit 310, a heat dissipation unit 320 disposed on the light emitting module unit 310, a heat dissipation unit 350 disposed on the heat dissipation unit 320, And a housing 350 that houses the fan 330, the light emitting module unit 310, the heat discharging body 320, and the heat radiating fan 330.

The light emitting module unit 310, the heat emitting body 320 and the heat dissipating fan 330 may be the same as those of the embodiment of the present invention. However, in another embodiment of the present invention, And a housing 350 for housing the heat-dissipating fan 330. The housing 350 may be divided into an upper case 150 and a lower case 160 as an embodiment of the present invention, or may be integrally formed.

A driving unit 340 is disposed inside the housing 350 to supply external power to the heat dissipating fan 330 and the light emitting module unit 310.

An air inlet 361 and an air outlet 362 may be disposed at a lower portion of the housing 350, that is, a portion facing the direction in which light is emitted from the light emitting module. An air passage may be disposed in the housing 350 so that air introduced from the air inlet 361 passes through the heat dissipating fan 330 and flows out through the air outlet 362 through the heat discharging body 320 have. Air passages connected to the air inlet 361 and the air outlet 362 can be separated from each other by the partition 351 in the housing 350 and the heat dissipation fan 330.

The cross-sectional area of the air inlet 361 at the bottom of the housing 350 may be designed to be larger than the cross-sectional area of the air outlet 362. As described above, this design can reduce dust entering the air inlet and increase dust leaving the air outlet. Thereby, the inflow of dust inside the illumination device can be prevented and the inflowing dust can be continuously removed, so that the good quality of the illumination device can be maintained.

Fig. 4 shows a cross-sectional view taken along line A-A in Fig.

4, an air inflow path of the illumination device 300 according to another embodiment of the present invention can be seen. The air outside the lighting apparatus 300 is moved to the space between the housing 350 and the upper portion of the heat radiating fan 330 through the air inlet 361 according to the operation of the heat radiating fan 330.

According to an embodiment of the present invention shown in FIG. 1, when the heat radiating fan 130 operates, external air may be moved to a space between the upper case 150 and the upper portion of the heat radiating fan 130.

The heat discharging body 320 may be configured to be separated from the air inflow path when the sectional view in the direction of the air inlet 361 is viewed. According to such a configuration, the air introduced from the air inlet 361 does not contact the heat discharging body 320, but keeps the room temperature and flows into the lighting apparatus. When the incoming air first comes into contact with the heat discharging body, heated air may flow into the space between the upper part of the heat radiating fan and the housing, so that the cooling of the driving unit 340 may not be effectively performed.

The introduced air is moved to a space between the housing 350 and the upper part of the heat radiating fan 330 while maintaining the room temperature and can be cooled by the heat exchange with the driving part 340 of the lighting device 300 have.

Fig. 5 shows a cross-sectional view taken along the line B-B in Fig.

5, the air discharge path of the illumination device 300 according to another embodiment of the present invention can be seen. 4, the air introduced into the upper part of the heat-dissipating fan 330 is injected into the space between the lower part of the heat-dissipating fan 330 and the heat-dissipating body 320 according to the operation of the heat-dissipating fan 330. The injected air passes through the surface of the heat discharging body 320 and exchanges heat with the heat discharging body 320 to cool the heat emitting body 320 that has been transferred from the light emitting module unit 310.

The inside of the housing 350 of the air outlet 362 is blocked by the partition wall 351 as shown in Figure 5 so that the air heated by absorbing the heat from the heat discharging body 320 is heated by the operation of the heat radiating fan 330, And is discharged outside the lighting apparatus 300 without entering the inside of the lighting apparatus 300 again.

Fig. 6 shows a cross-sectional view taken along the line C-C in Fig.

Fig. 7 shows a plan view of the line D-D in Fig.

6 and 7 are a sectional view and a plan view showing a part of the partition wall 351 of the illumination device 300 according to another embodiment of the present invention and show an air inlet 361 and an air outlet 362, The partition 351 can be seen.

8 shows a cross-sectional view of a lighting device according to another embodiment of the present invention.

The shape of the air inlet 361 is similar to that of the other embodiments of the present invention, but the shape of the air outlet 362 is such that the heated air is discharged horizontally Lt; / RTI &gt;

The air inlet 361 is arranged in the lower direction of the lighting device 300 and in the direction in which the lighting device 300 illuminates or in the direction in which light is emitted while the air outlet 362 is arranged in the outer peripheral direction of the lighting device 300 As shown in FIG. That is, it is needless to say that the air outlet 362 may be disposed outside the side surface of the illumination device 300, and the air outlet 362 may be disposed downward.

The discharged air has a higher temperature than the normal-temperature air in the warmed state, and thus has a tendency to rise. Therefore, it is possible to prevent the inflow of the heated air more effectively when the air is discharged in the vertical direction, in the horizontal direction, and in the outer peripheral direction of the lighting apparatus 300, than in the case of being discharged in the direction toward the illumination area.

Figure 9 shows various embodiments of the air inlet and air outlet arrangement of the lighting device of the present invention.

The air inlet 361 and the air outlet 362 may be arranged in various forms at various positions on the lower surface of the housing or the lower case as shown in FIG.

9 (a) and 9 (b), the air inlet 361 and the air outlet 362 may be arranged in an arc shape at the rim of the lower case. 9 (a) shows a case where the air inlet 361 and the air outlet 262 arranged in the rim portion are alternately arranged. The rim portion refers to an edge portion away from the center of the lower case, and how far the air inlet 361 and the air outlet 362 are disposed from the center of the lower case can be arbitrarily determined according to the embodiment of the present invention. 9 (a) and 9 (b), the air inlet 361 and the air outlet 262 may be arranged in an arc shape concentric with the lower case of the circular shape.

9 (c), the air inlet 361 of the lower case may be disposed inside the air outlet 362, and the air inlet 361 may be located at the center of the lower case 361 as shown in FIG. 9 (d) And the air outlet 362 may be configured to be disposed at a rim portion of the lower case. The shapes of the air inlet 361 and the air outlet 362 may take various forms such as a circular shape, a polygonal shape, and the like.

When the air inlet 361 is disposed inside the air outlet 362 as shown in FIGS. 9 (c) and 9 (d), the probability that the heated air discharged through the air outlet 362 is re-introduced through the air inlet is lowered .

Further, in each embodiment, the cross-sectional area of the air inlet 361 may be designed to be larger than the cross-sectional area of the air outlet 362. Thus, the inflow of dust in the illuminator is prevented, and the inflow dust can be quickly released, so that good quality of the illuminator can be maintained.

Table 1 shows the simulation results of the LED temperature and the case temperature in the MR16 illuminator with the ambient temperature of 25 ° C and the applied electric power of 10W. (A) to (d) in which only the heat radiator is used and the heat radiator is used and the air inlet and the air outlet are compared.

 Compared with the case where only the heat radiator is used, the case temperature can be increased from 0.1 ° C to 28 ° C when the heat radiating fan is used together, but the LED temperature is lowered by 16 ° C to 32 ° C.

Considering that the quality characteristics and life span of the LED are affected by the temperature of the LED, the illumination device according to the embodiments of the present invention exhibits remarkably improved performance in terms of quality characteristics and lifetime compared to the conventional case using only a heat radiator.

As described in the above embodiments, the present invention can provide an illumination device having an air inlet and an air outlet, which include a heat discharger and a heat dissipating fan, and are independently arranged from each other, thereby increasing the cooling efficiency.

Further, the lighting apparatus according to the present invention may be a recessed type lighting apparatus, in which even when the lighting apparatus is embedded, heat exchange with the outside air which is disposed at a portion where the air inlet and the air outlet are both exposed, Effectively.

 The embodiment of the present invention can be used in an illumination lamp for collecting light by collecting a plurality of LEDs. In particular, the LED is embedded in a ceiling or a wall to be mounted on a structure facing the illumination area, Type illumination device.

While the present invention has been particularly shown and 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, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100, 300: illumination device 110, 310: light emitting module part
120, 320: heat radiator 130, 330: heat radiator
140, 340: driving part 150: upper case
160: lower case 350: housing
361: Air inlet 362: Air outlet

Claims (17)

A light emitting module section;
A heat dissipation member disposed on the light emitting module section;
A heat radiating fan disposed on the heat radiator; And
And a housing for housing the light emitting module section, the heat discharging body, and the heat radiating fan,
Wherein the housing includes an air inlet and an air outlet which are blocked from each other,
Sectional area of the air inlet is larger than a cross-sectional area of the air outlet,
Wherein the housing has an air inlet and an air passage connected to the air outlet and has a partition disposed at the air outlet to block the space between the heat dissipation fan and the housing,
Wherein the heat discharging body has a blocking wall extending from a side surface of the heat discharging body to the side surface of the heat radiating fan at the air inlet so as not to contact the air flowing through the air inlet,
Lighting device. The method according to claim 1,
Wherein the air inlet and the air outlet are disposed on a surface of the housing,
Lighting device. 3. The method of claim 2,
Wherein the air inlet and the air outlet are disposed at a rim portion of the surface of the housing,
Lighting device. 3. The method of claim 2,
Wherein the air inlet is located at the center of the face of the housing and the air outlet is located at a rim of the face of the housing,
Lighting device. 3. The method of claim 2,
The air inlet being located closer to the center of the face of the housing than the air outlet,
Lighting device. The method according to claim 1,
Wherein the air inlet is disposed on the surface of the housing and the air outlet is disposed on a surface facing the outer circumference of the housing,
Lighting device. delete delete A light emitting module section;
A heat dissipation member disposed on the light emitting module section;
A heat radiating fan disposed on the heat radiator;
An upper case covering the heat dissipating fan; And
And a lower case coupled to the upper case and fixing the light emitting module part,
Wherein the lower case has an air inlet and an air outlet which are blocked from each other,
Sectional area of the air inlet is larger than a cross-sectional area of the air outlet,
Wherein the lower case has an air inlet and an air passage connected to the air outlet and has a partition disposed at the air outlet to block the space between the heat radiation fan and the lower case,
Wherein the heat discharging body has a blocking wall extending from a side surface of the heat discharging body to the side surface of the heat radiating fan at the air inlet so as not to contact the air flowing through the air inlet,
Lighting device. 10. The method of claim 9,
Wherein the air inlet and the air outlet are disposed on a surface of the lower case,
Lighting device. 11. The method of claim 10,
Wherein the air inlet and the air outlet are disposed at a rim portion of the lower case,
Lighting device. 11. The method of claim 10,
Wherein the air inlet is disposed at a center of the lower case, and the air outlet is disposed at a rim of the lower case.
Lighting device. 11. The method of claim 10,
Wherein the air inlet is disposed closer to the center of the lower case than the air outlet,
Lighting device. 10. The method of claim 9,
Wherein the air inlet is disposed on the surface of the lower case, and the air outlet is located on the outer circumferential side of the lower case,
Lighting device. The method according to claim 3 or 11,
Wherein the air inlet and the air outlet are alternately arranged,
Lighting device. delete delete

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