JP7291884B2 - lighting equipment - Google Patents

Description

The present invention relates to lighting devices.

2. Description of the Related Art Conventionally, there is a lighting system that uses a projector, which is a light projection device, instead of a lighting device (light) to create a space. In such a lighting system, the light projection device is installed, for example, suspended from the ceiling.

JP 2016-161882 A

2. Description of the Related Art In recent years, in order to enhance the aesthetic appearance of an illumination space, it has been considered to embed and install an illumination device (light projection device) in a partition (for example, a ceiling, a floor, a wall, etc.) that partitions the illumination space. Inside the building, the space on the opposite side of the lighting space partitioned by the partition (e.g., the ceiling space, the floor space, and the wall space) is a closed closed space, so there is more dust than the lighting space. ing.

Here, the lighting device is provided with a cooling mechanism that takes in and exhausts the outside air, but if the lighting device is embedded in the partition, the dust will be taken in by the suction from the closed space, resulting in a deterioration in quality. more likely to do so.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting device capable of maintaining quality for a long period of time by suppressing dust suction from a closed space even when embedded in a partition.

A lighting device according to an aspect of the present invention is a lighting device embedded in a partition that partitions a first space and a second space different from the first space, comprising: a light source unit; housing a cooling mechanism that generates an airflow for cooling the light source unit and the cooling mechanism, and is arranged in the second space so that the light from the light source unit is emitted to the first space a housing attached to the body, the housing having an intake port for taking in outside air with an airflow generated by a cooling mechanism, and an exhaust port for exhausting the airflow, wherein the intake port is a first It is arranged in a position facing the space.

According to the lighting device according to the present invention, even if the lighting device is embedded in the partition, the quality can be maintained for a long time by suppressing the suction of dust from the closed space.

FIG. 1 is a cross-sectional view showing a schematic configuration of a lighting device according to an embodiment. FIG. 2 is a block diagram showing the control configuration of the lighting device according to the embodiment. FIG. 3 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 1. As shown in FIG. FIG. 4 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 2. As shown in FIG. FIG. 5 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 3. As shown in FIG. FIG. 6 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 4. As shown in FIG.

A lighting device according to an embodiment of the present invention will be described below with reference to the drawings. It should be noted that each of the embodiments described below is a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement of components, connection forms, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in independent claims representing the highest level concept of the present invention will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Moreover, in each figure, the same code|symbol is attached|subjected about the same component.

[Embodiment]
Embodiments will be described below. First, the mode of use of the lighting device according to the embodiment will be described. FIG. 1 is a cross-sectional view showing a schematic configuration of a lighting device according to an embodiment. As shown in FIG. 1, a lighting device 100 is attached to a ceiling panel 10 in a building. The ceiling plate 10 is an example of a division body that divides a first space 11, which is a living space of a building, and a second space 12, which is a ceiling space. The second space 12 is a closed space that is normally closed. Therefore, the second space 12 is a space that is difficult to clean and tends to collect dust.

Lighting device 100 is fitted into and fixed to opening 13 provided in ceiling plate 10 . A light irradiation surface 101 of the illumination device 100 is exposed from the surface of the ceiling plate 10 (main surface on the first space 11 side). Also, most of the lighting device 100 is arranged in the second space 12 .

Next, the configuration of lighting device 100 will be described. The illumination device 100 includes a housing 110 , a light source section 120 , an image element 130 , a cooling mechanism 140 , an intake duct 150 and an exhaust duct 160 .

The housing 110 houses the light source section 120 , the cooling mechanism 140 , the image element 130 , the intake duct 150 and the exhaust duct 160 . The housing 110 is, for example, a substantially rectangular parallelepiped resin or metal case. One surface of the housing 110 is a light irradiation surface 101 and light is emitted from the light irradiation surface 101 . Specifically, a projection lens 111 is embedded in a portion of the light irradiation surface 101, and light (see the two-dot chain line in FIG. 1) is projected downward from the projection lens 111. FIG. The irradiation direction of the light from the projection lens 111 may be any direction that intersects the light irradiation surface 101 .

Also, an intake port 102 and an exhaust port 103 are formed in a part of the light irradiation surface 101 . Specifically, the intake port 102 and the exhaust port 103 are arranged so as to sandwich the projection lens 111 in cross-sectional view. The intake port 102 and the exhaust port 103 are arranged at positions facing the first space 11 .

The air intake 102 is entirely covered by a replaceable first filter 104 . The exhaust port 103 is entirely covered with a replaceable second filter 105 . The housing 110 is sealed except for the intake port 102 and the exhaust port 103, so that the inside and outside of the housing 110 cannot be ventilated from the portions other than the intake port 102 and the exhaust port 103. .

The first filter 104 is a dust collection filter, and removes dust and oil that try to enter the housing 110 through the intake port 102 . The second filter 105 is a dust collection filter and removes dust and oil trying to enter the housing 110 through the exhaust port 103 .

The light source unit 120 is a device that irradiates the image element 130 with light. Examples of light sources provided in the light source unit 120 include mercury lamps, LEDs (Light Emitting Diodes), and LDs (Laser Diodes). Any of the light sources becomes a heat source during light irradiation, resulting in a high temperature. The light source unit 120 may have a plurality of light sources that respectively emit red light, blue light, and green light. Further, the light source unit 120 may have only one color light source, and may have a phosphor wheel for wavelength-converting the color light emitted from the light source into a different color light.

The image element 130 is an element that forms a projected image with light from the light source section 120 . Examples of the image element 130 include a transmissive liquid crystal element, a reflective liquid crystal element, and a DMD (Digital Micromirror Device). In FIG. 1, the image element 130 is illustrated assuming a reflective liquid crystal element or DMD. The image element 130 also becomes a heat source during driving and reaches a high temperature.

In the present embodiment, although not shown, the housing 110 includes an optical system for guiding light emitted from the light source unit 120 to the image element 130, and a projection lens 111 for transmitting light reflected by the image element 130. An optical system is provided to guide the

The cooling mechanism 140 is a mechanism for cooling the heat sources (the light source unit 120, the image element 130, etc.) inside the housing 110. FIG. Specifically, the cooling mechanism 140 includes a first fan 141 and a second fan 142 . The first fan 141 is arranged near the intake port 102 inside the housing 110 . The first fan 141 draws the air in the first space 11 into the housing 110 through the air inlet 102 by being rotationally driven. The second fan 142 is arranged near the exhaust port 103 inside the housing 110 . The second fan 142 discharges the air inside the housing 110 toward the first space 11 through the exhaust port 103 by being rotationally driven. In FIG. 1 , the airflow generated inside the housing 110 by driving the first fan 141 and the second fan 142 is indicated by dashed arrows. Since the light source unit 120 and the image element 130 are arranged along this airflow, the light source unit 120 and the image element 130 can be efficiently cooled only by one airflow generated by the cooling mechanism 140 . In particular, since the light source unit 120 that generates a large amount of heat is arranged upstream of the image element 130 , the light source unit 120 can be efficiently cooled by the air that has just been taken in from the first space 11 .

Air intake duct 150 is a duct made of metal or resin, for example, arranged inside housing 110 . The intake duct 150 guides the airflow generated by the cooling mechanism 140 from the intake port 102 to the light source section 120 . Specifically, one end of air intake duct 150 is arranged near air intake 102 so as to surround air intake 102 , and the other end is arranged near light source 120 . A first fan 141 is accommodated in the intake duct 150 . As a result, the airflow generated by driving the first fan 141 can reliably pass through the intake duct 150 .

The exhaust duct 160 is, for example, a metal or resin duct arranged inside the housing 110 . The exhaust duct 160 guides the airflow generated by the cooling mechanism 140 to the exhaust port 103 . Specifically, one end of the exhaust duct 160 is arranged near the image element 130 which is a heat source, and the other end is arranged near the exhaust port 103 so as to surround the exhaust port 103 . . A second fan 142 is accommodated in the exhaust duct 160 . As a result, the airflow generated by driving the second fan 142 can reliably pass through the exhaust duct 160 .

FIG. 2 is a block diagram showing the control configuration of the lighting device according to the embodiment. As shown in FIG. 2 , the illumination device 100 includes a control section 170 that controls the light source section 120 , the image element 130 and the cooling mechanism 140 . The control unit 170 includes a CPU, a ROM, a RAM, etc. The CPU reads programs stored in the ROM and develops them in the RAM, thereby executing various processes. Image data of an image formed by the image element 130 is stored in advance in the ROM. Note that the control unit 170 may acquire image data from an external device such as a smartphone, a PC, or a remote control via the communication unit 190 .

The control unit 170 drives the light source unit 120 , the image element 130 , the first fan 141 and the second fan 142 when the power is turned on. As a result, directly below the illumination device 100 , light is emitted from the projection lens 111 toward the first space 11 . Also, in the housing 110 , an airflow is generated from the intake port 102 to the exhaust port 103 to cool the light source section 120 and the image element 130 . If other heat sources, such as the circuit board and the power supply board on which the control unit 170 is mounted, are also arranged in the air flow path caused by the cooling mechanism 140, the other heat sources can be efficiently cooled. It is possible.

[Effects, etc.]
As described above, according to the present embodiment, the lighting device embedded in the ceiling plate 10 (partition body) that partitions the first space 11 and the second space 12 different from the first space 11 100, containing the light source unit 120, the cooling mechanism 140 that generates an airflow for cooling the light source unit 120, the light source unit 120 and the cooling mechanism 140, and arranged in the second space 12, a housing 110 attached to the ceiling plate 10 so as to emit light from the light source unit 120 to the first space 11, and the housing 110 draws outside air with an airflow generated by the cooling mechanism 140. and an exhaust port 103 for discharging the airflow. The intake port 102 is arranged at a position facing the first space 11 .

According to this, since the intake port 102 is arranged at a position facing the first space 11 , outside air can be taken into the housing 110 from the first space 11 via the intake port 102 . Since the first space 11 is a cleaner space than the second space 12 , dust is less likely to enter the housing 110 . In this way, even if the lighting device 100 is embedded in the ceiling plate 10, it is possible to suppress the suction of dust from the second space 12, which is a closed space. Therefore, it is possible to maintain the quality of the lighting device 100 for a long period of time.

Moreover, the temperature of the second space 12, which is a closed space, may be high depending on the season. For example, if the second space 12 is in the ceiling space, the building environment may reach 60° C. to 70° C. in summer. However, if the intake port 102 is arranged at a position facing the first space 11 as in the present embodiment, the air from the first space 11 whose temperature is not higher than that of the second space 12 is introduced into the housing 110. It is possible to take in and cool efficiently.

Also, the exhaust port 103 is arranged at a position facing the first space 11 and at a position different from the intake port 102 .

According to this, since the exhaust port 103 is arranged at a position facing the first space 11 , the air warmed by the heat source inside the housing 110 can be exhausted to the first space 11 . As a result, it is possible to suppress the accumulation of heat in the second space 12 due to the exhaust air. In addition, since the exhaust port 103 is arranged at a position facing the first space 11, dust in the second space 12 does not enter the exhaust port 103 even when no air current is generated, such as when the machine is stopped. can be prevented.

The lighting device 100 also has a first filter 104 that covers the intake port 102 .

According to this, since the intake port 102 is covered with the first filter 104 , even if dust or oil is sucked from the intake port 102 , the dust can be removed by the first filter 104 . Therefore, dust entering the housing 110 can be further suppressed, and the quality of the lighting device 100 can be maintained for a longer period of time.

The lighting device 100 also has a second filter 105 that covers the exhaust port 103 .

According to this, since the exhaust port 103 is covered with the second filter 105 , even if dust or oil tries to enter from the exhaust port 103 , the dust can be removed by the second filter 105 . Therefore, dust entering the housing 110 can be further suppressed, and the quality of the lighting device 100 can be maintained for a longer period of time.

The illumination device 100 also has an image element 130 that is arranged in the housing 110 and that forms an image using the light from the light source section 120 as a source.

According to this, since the image element 130 forms an image based on the light from the light source unit 120, various forms of illumination light can be realized. Further, the image element 130 also becomes a heat source during driving, but since an airflow is generated by the cooling mechanism 140 in the housing 110, the image element 130 can also be cooled. As described above, since the housing 110 has a structure in which dust does not easily enter, it is difficult for dust to adhere to the image element 130 as well. Therefore, the quality of the image element 130 can also be maintained for a long period of time.

The illumination device 100 also has an air intake duct 150 that is arranged inside the housing 110 and guides the airflow generated by the cooling mechanism 140 from the air intake 102 to the light source section 120 .

According to this, the intake duct 150 guides the airflow from the cooling mechanism 140 from the intake port 102 to the light source section 120, so that the light source section 120 can be cooled smoothly. Therefore, the cooling efficiency can be further improved, and the quality of the lighting device 100 can be maintained for a longer period of time.

The lighting device 100 also has an exhaust duct 160 that is arranged inside the housing 110 and guides the airflow generated by the cooling mechanism 140 to the exhaust port 103 .

According to this, the exhaust duct 160 guides the airflow from the cooling mechanism 140 to the exhaust port 103 , so that the warmed air can be smoothly discharged to the outside of the housing 110 . As a result, heat is less likely to stay inside the housing 110, and as a result, the cooling efficiency can be further enhanced. Therefore, the quality of lighting device 100 can be maintained for a longer period of time.

[Modification 1]
Next, modification 1 will be described. Modification 1 differs from the above-described embodiment in that the housing is provided with a second exhaust port for discharging the airflow generated by the cooling mechanism toward the second space. In the following description, parts that are the same as those of the lighting apparatus 100 according to the above-described embodiment are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 3 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 1. As shown in FIG. As shown in FIG. 3, a housing 110a of the lighting device 100A is provided with a second exhaust port 107 at a position facing the second space 12. As shown in FIG. Specifically, the second exhaust port 107 is arranged at a position facing the exhaust port 103 on the surface of the housing 110 a opposite to the light irradiation surface 101 . It should be noted that the second exhaust port 107 may be arranged in any part of the housing 110 a as long as it is positioned to face the second space 12 . The second exhaust port 107 is entirely covered with a replaceable third filter 108 .

The lighting device 100A also has a second exhaust duct 180 . The second exhaust duct 180 is, for example, a metal or resin duct arranged inside the housing 110 . The second exhaust duct 180 guides the airflow generated by the cooling mechanism 140 to the second exhaust port 107 . Specifically, one end of the second exhaust duct 180 is arranged near the image element 130 which is a heat source, and the other end is located near the second exhaust port 107 and surrounds the second exhaust port 107. are arranged as One end of the second exhaust duct 180 is arranged near one end of the exhaust duct 160 . A second fan 142 is arranged upstream of one end of the second exhaust duct 180 and one end of the exhaust duct 160 . As a result, the airflow generated by the second fan 142 is divided into the exhaust duct 160 and the second exhaust duct 180, and exhausted to the outside of the housing 110a through the exhaust port 103 and the second exhaust port 107, respectively.

Thus, the housing 110 a has the second exhaust port 107 that exhausts the airflow generated by the cooling mechanism 140 toward the second space 12 .

According to this, since the air is exhausted from the second exhaust port 107 toward the second space 12, it is possible to ventilate the inside of the second space 12 with the warmed air. Therefore, the humidity in the second space 12 can be lowered. In other words, it is possible to lower the humidity in the second space 12, which is a closed space, while cooling the heat source of the lighting device 100, and to suppress dew condensation in the building. If the dew condensation on the building is reduced, failure of the lighting device 100A caused by the dew condensation can be suppressed. Therefore, the quality of the lighting device 100A can be maintained for a long period of time.

In addition, the lighting device 100A has a third filter 108 covering the second exhaust port 107. According to this, the second exhaust port 107 is covered with the third filter 108, so that dust can be removed from the second exhaust port 107. Even if it tries to enter, the dust can be removed by the third filter 108 . Therefore, dust entering the housing 110a can be further suppressed, and the quality of the lighting device 100 can be maintained for a longer period of time.

[Modification 2]
Next, modification 2 will be described. Modification 2 differs from Modification 1 in that the exhaust port 103 and the exhaust duct 160 are removed from the illumination device 100A according to Modification 1. FIG. In the following description, parts that are the same as those of the lighting device 100A according to Modification 1 are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 4 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 2. As shown in FIG. As shown in FIG. 4, the housing 110b of the lighting device 100B is provided with a second exhaust port 107 at a position facing the second space 12, and an exhaust port at a position facing the first space 11. is not provided. Also, the second fan 142 is housed in the second exhaust duct 180 . Therefore, the airflow generated by driving the second fan 142 can reliably pass through the second exhaust duct 180 .

Here, since the second exhaust port 107 is provided above the heat source, even if the second fan 142 is not driven due to a problem or the like, air can be smoothly exhausted by convection. Further, in the case of Modification 2, all the airflow inside the housing 110b is discharged from the second exhaust port 107, so that the ventilation effect for the second space 12, which is the closed space, can be further enhanced.

[Modification 3]
Next, modification 3 will be described. Modification 3 differs from the embodiment in that the lighting device is attached to the wall plate. In the following description, parts that are the same as those of the lighting apparatus 100 according to the above-described embodiment are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 5 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 3. As shown in FIG. As shown in FIG. 5, a lighting device 100C according to Modification 3 is attached to a wall plate 10c inside a building. The wall plate 10c is an example of a dividing body that separates the first space 11, which is the living space of the building, from the second space 12c, which is the internal space of the wall. The second space 12c is a closed space that is normally closed. Therefore, the second space 12c is a space that is difficult to clean and tends to collect dust.

The lighting device 100C is fitted and fixed to an opening 13c provided in the wall plate 10c. The light irradiation surface 101 of the lighting device 100C is exposed from the surface of the wall plate 10c (main surface on the side of the first space 11). Also, most of the lighting device 100C is arranged in the second space 12c.

In the illumination device 100C attached to the wall plate 10c, when the light source unit 120, the image element 130, the first fan 141 and the second fan 142 are driven under the control of the control unit 170, the side of the illumination device 100 , light is emitted from the projection lens 111 toward the first space 11 . Also, in the housing 110 , an airflow is generated from the intake port 102 to the exhaust port 103 to cool the light source section 120 and the image element 130 . Here, since the intake port 102 is arranged at a position facing the first space 11 , external air can be taken into the housing 110 from the first space 11 via the intake port 102 . Since the first space 11 is a cleaner space than the second space 12 , dust is less likely to enter the housing 110 . In this way, even if the lighting device 100C is embedded in the wall plate 10c, it is possible to suppress the suction of dust from the second space 12c, which is the closed space. Therefore, it is possible to maintain the quality of the lighting device 100C over the long term.

In addition, with respect to other points, the illumination device 100C according to Modification 3 can achieve the same effects as those of the illumination device 100 of the above-described embodiment.

[Modification 4]
Next, modification 4 will be described. Modification 4 differs from the embodiment in that the lighting device is attached to the floorboard. In the following description, parts that are the same as those of the lighting apparatus 100 according to the above-described embodiment are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 6 is a cross-sectional view showing a schematic configuration of a lighting device according to Modification 4. As shown in FIG. As shown in FIG. 6, a lighting device 100D according to Modification 4 is attached to a floorboard 10d in a building. 10 d of floorboards are an example of the division body which divides the 1st space 11 which is a residential space of a building, and 12d of 2nd spaces which are underfloors. The second space 12d is a closed space that is normally closed. Therefore, the second space 12d is a space that is difficult to clean and tends to collect dust.

The lighting device 100D is fitted and fixed to the opening 13d provided in the floor plate 10d. The light irradiation surface 101 of the lighting device 100D is exposed from the surface of the floorboard 10d (main surface on the side of the first space 11). Also, most of the lighting device 100D is arranged in the second space 12d.

In the lighting device 100D attached to the floor plate 10d, when the light source unit 120, the image element 130, the first fan 141, and the second fan 142 are driven under the control of the control unit 170, the projection light is projected above the lighting device 100. Light is emitted from the lens 111 toward the first space 11 . Also, in the housing 110 , an airflow is generated from the intake port 102 to the exhaust port 103 to cool the light source section 120 and the image element 130 . Here, since the intake port 102 is arranged at a position facing the first space 11 , external air can be taken into the housing 110 from the first space 11 via the intake port 102 . Since the first space 11 is a cleaner space than the second space 12 , dust is less likely to enter the housing 110 . In this way, even if the lighting device 100D is embedded in the floor plate 10d, it is possible to suppress dust from being sucked from the second space 12d, which is a closed space. Therefore, it is possible to maintain the quality of the lighting device 100D over the long term.

In addition, with respect to other points, the lighting device 100D according to the fourth modification can achieve the same effects as the lighting device 100 of the above-described embodiment.

When the lighting device 100D is attached to the floorboard 10d, the entire intake port 102 and the exhaust port 103 are covered with a waterproof ventilation sheet so that the liquid spilled on the floorboard 10d does not enter the intake port 102 and the exhaust port 103. You can cover it. Moreover, in order to protect the floor board 10d from people and pets walking on it, the entire intake port 102 and the exhaust port 103 may be covered with a rigid mesh body having a plurality of through holes.

[others]
As described above, the illumination device according to the present invention has been described based on the above-described embodiment and each modified example, but the present invention is not limited to the above-described embodiment and each modified example. For example, the present invention may have a configuration obtained by combining the above embodiments and modifications.

Although the lighting device 100 including the image element 130 is illustrated in the above embodiment, the lighting device may not include the image element.

Further, although the lighting device 100 including the first filter 104 and the second filter 105 is illustrated in the above embodiment, the lighting device may not include at least one of the first filter and the second filter.

Further, although the lighting device 100 including the intake duct 150 and the exhaust duct 160 is illustrated in the above embodiment, the lighting device may not include at least one of the intake duct 150 and the exhaust duct 160 .

Further, in the above embodiment, the cooling mechanism 140 includes the first fan 141 and the second fan 142, but the cooling mechanism may include at least one fan. When only one fan is provided, it is preferable to arrange the fan on the exhaust port side.

Further, in the above-described embodiment, the lighting device 100 is fitted into the opening 13 provided in the ceiling plate 10 as an example. The lighting device may be mounted on the ceiling plate. In this case, openings for exposing the projection lens, the air inlet, and the air outlet may be formed in the ceiling panel.

In addition, a form obtained by applying various modifications to the embodiment that a person skilled in the art can think of, and a form realized by arbitrarily combining the constituent elements and functions of each embodiment within the scope of the present invention. is also included in the present invention.

10 Ceiling board (partition body)
10c Wall plate (partition body)
10d Floor board (partition body)
11 First spaces 12, 12c, 12d Second spaces 100, 100A, 100B, 100C, 100D Lighting device 102 Intake port 103 Exhaust port 104 First filter 105 Second filter 107 Second exhaust port 108 Third filters 110, 110a, 110b housing 120 light source unit 130 image element 140 cooling mechanism 141 first fan 142 second fan 150 intake duct 160 exhaust duct 180 second exhaust duct

Claims (8)

A lighting device embedded in a partition that partitions a first space and a second space separate from the first space,
a light source;
a cooling mechanism for generating an airflow for cooling the light source;
A housing that houses the light source unit and the cooling mechanism and is attached to the partition so as to emit light from the light source unit to the first space while being arranged in the second space. and,
an image element arranged in the housing for forming an image caused by light from the light source unit;
The housing has an intake port for sucking outside air with an airflow generated by the cooling mechanism, and an exhaust port for discharging the airflow,
The lighting device, wherein the intake port is arranged at a position facing the first space. The lighting device according to claim 1, wherein the exhaust port is arranged at a position facing the first space and different from the intake port. 3. The lighting device according to claim 1, further comprising a first filter covering said air inlet. The lighting device according to any one of claims 1 to 3, further comprising a second filter that covers the exhaust port. 5. The lighting device according to any one of claims 1 to 4 , further comprising an intake duct disposed within the housing and guiding an airflow generated by the cooling mechanism from the intake port to the light source. 6. The lighting device according to any one of claims 1 to 5 , further comprising an exhaust duct disposed within the housing and guiding airflow generated by the cooling mechanism to the exhaust port. The lighting device according to any one of claims 1 to 6 , wherein the housing has a second exhaust port for exhausting the airflow generated by the cooling mechanism toward the second space. The lighting device according to claim 7 , further comprising a third filter covering said second exhaust port.

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