Lighting device

Abstract

To provide a technology capable of improving a cooling effect using an axial flow fan.SOLUTION: A lighting device comprises a housing having a housing suction port, a light-emitting device, an axial flow fan, and a sealing member. The light-emitting device is located inside the housing, and emits illumination light outside the housing. The axial flow fan is located inside the housing, takes in air from outside the housing into the housing through the housing suction port, and has a fan suction port. When the housing suction port and the fan suction port are viewed from an axial direction of the axial flow fan, an edge of the housing suction port is located outside the edge of the fan suction port. The sealing member seals a gap around the fan suction port.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a lighting device. [Background technology]

[0002] Patent Document 1 describes a technique relating to a lighting device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-49010 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is room for improvement in the lighting system. [Means for solving the problem]

[0005] An illumination device is disclosed. In one embodiment, the illumination device includes a housing having a housing inlet, a light emitting device, an axial fan, and a sealing member. The light emitting device is located within the housing and emits illumination light to the outside of the housing. The axial fan is located inside the housing, takes in air from the outside of the housing into the housing through the housing inlet, and has a fan inlet. When the housing inlet and the fan inlet are viewed from the axial direction of the axial fan, the edge of the housing inlet is located outside the edge of the fan inlet. The sealing member seals the gap around the fan inlet. Effect of the Invention

[0006] The cooling effect of the axial fan can be improved. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Diagram 2]FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Diagram 3] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Figure 4] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Diagram 5] FIG. 2 is a schematic diagram showing an example of the state inside a housing. [Figure 6] FIG. 2 is a schematic diagram showing an example of the state inside a housing. [Figure 7] FIG. 2 is a schematic diagram showing an example of the state inside a housing. [Figure 8] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 9] FIG. 1 is a schematic diagram illustrating an example of an axial fan. [Figure 10] FIG. 1 is a schematic diagram illustrating an example of an axial fan. [Figure 11] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Figure 12] 4 is a schematic diagram showing an example of a cross-sectional structure of a housing and a partition portion. FIG. [Figure 13] 4 is a schematic diagram showing an example of a cross-sectional structure of a rib of a partition portion. FIG. [Figure 14] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Figure 15] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 16] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Figure 17] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 18] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 19] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 20] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 21] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 22] FIG. 2 is a schematic diagram showing an example of a vibration-proof sheet. [Diagram 23] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 24] FIG. 1 is a schematic diagram illustrating an example of a lighting device. [Diagram 25] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 26] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. [Figure 27] FIG. 2 is a schematic diagram showing an example of a configuration of a portion of a lighting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] 1 to 3 are schematic perspective views showing an example of the lighting device 1. In FIGS. 1 to 3, the lighting device 1 is shown viewed from different angles. The lighting device 1 is a device that emits illumination light L1 (see FIG. 1) into a lighting space. For example, the lighting space is present indoors, and the lighting device 1 is used indoors. The lighting space may be, for example, an interior space of a building. The lighting device 1 is disposed, for example, on the ceiling of the lighting space. Note that the lighting device 1 may also be used outdoors.

[0009] 1 to 3, the lighting device 1 includes, for example, a housing 2 constituting an exterior of the lighting device 1, and an axial flow fan 3 housed in the housing 2. The lighting device 1 also includes a light-emitting device 4 (see FIG. 5 described later) housed in the housing 2.

[0010] The light emitting device 4 is fixed to the housing 2 on the inside of the housing 2. The light emitting device 4 emits illumination light L1 to the outside of the housing 2. As shown in Fig. 1, the housing 2 is provided with an emission port 25 for extracting the illumination light L1 emitted by the light emitting device 4 to the outside of the housing 2. The illumination light L1 from the light emitting device 4 is emitted from the emission port 25 into an illumination space outside the housing 2.

[0011] The axial fan 3 is fixed to the housing 2 on the inside of the housing 2. As shown in Figures 1 and 2, the housing 2 is provided with an air intake 20 (also referred to as a housing air intake 20) for taking in air from the outside of the housing 2 to the inside of the housing 2. The air intake 20 can also be referred to as a vent through which air passes, or the air intake 20 can also be referred to as an opening through which air passes. Figure 4 is a schematic plan view showing an example of the lighting device 1 as viewed from the housing air intake 20 side.

[0012] 2 and 3, the housing 2 is provided with at least one exhaust section 23 for discharging air taken into the housing 2 to the outside of the housing 2. In this example, two exhaust sections 23 are provided in the housing 2. The exhaust section 23 is composed of, for example, a plurality of exhaust ports 230. The exhaust ports 230 can also be considered as vents through which air passes or openings through which air passes.

[0013] The air taken into the housing 2 by the axial fan 3 hits the light emitting device 4, and then is exhausted to the outside of the housing 2 through the two exhaust parts 23. This allows the light emitting device 4 to be cooled by the air. In other words, the light emitting device 4 is air-cooled. The axial fan 3 can also be called a cooling fan or an air-cooling fan.

[0014] Hereinafter, for convenience of explanation, the front side and the back side of the paper in Fig. 4 will be respectively the front side and the back side of the lighting device 1. Also, for convenience of explanation, the left side and the right side of the paper in Fig. 4 will be respectively the left side and the right side of the lighting device 1. Also, for convenience of explanation, the upper side and the lower side of the paper in Fig. 4 will be respectively the upper side and the lower side of the lighting device 1.

[0015] <Example of case configuration> The housing 2 has, for example, a roughly rectangular parallelepiped shape. It can also be said that the housing 2 is box-shaped. The housing 2 is made of, for example, aluminum or an aluminum alloy. The material of the housing 2 is not limited to this, and the housing 2 may be made of resin, or may be made of resin and metal, or may be made of other materials.

[0016] The housing 2 is composed of, for example, six walls 201, 202, 203, 204, 205, and 206. The wall 201 (also referred to as the front wall 201) located on the front side and the wall 202 (also referred to as the rear wall 202) located on the rear side face each other. The wall 203 (also referred to as the right wall 203) located on the right side and the wall 204 (also referred to as the left wall 204) located on the left side face each other. The wall 205 (also referred to as the upper wall 205) located on the upper side and the wall 206 (also referred to as the lower wall 206) located on the lower side face each other.

[0017] The air intake 20 is provided in, for example, the front wall 201. The outer shape of the air intake 20 seen from the front side is, for example, circular. The axial fan 3 is fixed, for example, to the inner surface of the front wall 201 (in other words, the rear surface). The front wall 201 has a fixed portion 201a to which the axial fan 3 is fixed. The fixed portion 201a is detachable or can be opened and closed to the outside of the housing 2, as described below.

[0018] The two exhaust sections 23 are provided, for example, on the right wall section 203 and the left wall section 204, respectively. Due to the rotation of the axial flow fan 3, air is taken into the housing 2 from the front side thereof and hits the light emitting device 4. Then, due to the rotation of the axial flow fan 3, the air taken into the housing 2 is exhausted to the outside of the housing 2 from the right and left sides of the housing 2.

[0019] 2 and 3, the housing 2 includes a heat dissipation structure 210 that dissipates heat generated by a wavelength conversion unit 42 (see FIG. 5) included in the light emitting device 4. The heat dissipation structure 210 is provided, for example, on the outer surface (in other words, the rear surface) of the rear wall portion 202. The heat dissipation structure 210 includes, for example, a plurality of plate-shaped heat dissipation fins 211. Each heat dissipation fin 211 is formed integrally with the rear wall portion 202, for example.

[0020] Each heat dissipation fin 211 extends, for example, along the up-down direction. The multiple heat dissipation fins 211 are arranged in a row along the left-right direction, for example, so that their thickness direction is along the left-right direction. Note that the configuration of the heat dissipation structure 210 is not limited to this. For example, the multiple heat dissipation fins 211 may be arranged in a row along the up-down right direction, so that their thickness direction is along the up-down direction. Also, the heat dissipation structure 210 may include multiple heat dissipation pins instead of the multiple heat dissipation fins 211. In this case, the multiple heat dissipation pins may be arranged, for example, in a matrix.

[0021] <Example of the configuration of a light-emitting device> Fig. 5 is a schematic diagram showing an example of the inside of the housing 2 as viewed from the right side. As shown in Fig. 5, the light emitting device 4 includes, for example, a housing 40, a laser light source 41, a wavelength conversion unit 42, and an optical system 43. The light emitting device 4 also includes a heat diffusion member 45, a heat diffusion member 46, and a heat dissipation member 48. The heat diffusion members 45 and 46 are also called, for example, heat spreaders. The heat dissipation member 48 is also called, for example, a heat sink. In Fig. 5, the cross-sectional structures of the housing 2 and the housing 40 are indicated by diagonal lines.

[0022] The housing 40 includes, for example, a cylindrical first portion 401 with both ends open, and a cylindrical second portion 402 connected to the first portion 401 and with both ends open. The internal space of the first portion 401 and the internal space of the second portion 402 are connected. The first portion 401 contains a laser light source 41, a wavelength conversion unit 42, a heat diffusion member 45, and a heat diffusion member 46. The optical system 43 exists, for example, straddling the internal space of the first portion 401 and the internal space of the second portion 402.

[0023] The first portion 401 extends, for example, along the front-rear direction. An opening at one end of the first portion 401 faces the front side, and an opening at the other end of the first portion 401 faces the rear side. The second portion 402 extends, for example, downward from the peripheral wall of the first portion 401. An opening at one end of the second portion 402 faces upward and is connected to the internal space of the first portion 401. An opening at the other end of the second portion 402 faces downward. The opening at the other end of the second portion 402 functions as an outlet 403 for taking out the illumination light L1 generated in the housing 40 to the outside of the housing 40. The illumination light L1 generated in the housing 40 is emitted from the outlet 403 to the outside of the housing 40, and then emitted from the outlet 25 of the housing 2 to the outside of the housing 2.

[0024] The laser light source 41 generates laser light L2 and emits it to the optical system 43. The laser light L2 may be light having a peak in the wavelength range of 380 nm to 415 nm, for example. For example, the laser light L2 may be purple light having a peak near 405 nm. The laser light L2 is not necessarily limited to purple light, and may be blue light having a peak near 450 nm, for example.

[0025] For example, a semiconductor laser element such as a laser diode or a vertical cavity surface emitting laser (VCSEL) is used as the laser light source 41. For example, a gallium nitride (GaN)-based semiconductor laser element that emits purple laser light L2 of 405 nm may be used as the laser light source 41.

[0026] The optical system 43 includes, for example, at least one lens and a wavelength separation filter 430. The wavelength separation filter 430 includes, for example, a substrate made of glass or the like and a dielectric multilayer film on the substrate. The wavelength separation filter 430 is housed, for example, in the first portion 401. The optical system 43 may include at least one first lens housed in the first portion 401 and at least one second lens housed in the second portion 402. The at least one first lens is located closer to the laser light source 41 than the wavelength separation filter 430.

[0027] The laser light source 41 and the wavelength conversion unit 42 are arranged in the first part 401, for example, in the front-rear direction. The laser light source 41 is located in front of the first part 401, and the wavelength conversion unit 42 is located in the rear of the first part 401. At least one first lens and wavelength separation filter 430 housed in the first part 401 are located between the laser light source 41 and the wavelength conversion unit 42. The laser light source 41 and the wavelength conversion unit 42 are arranged in the light source direction of the laser light source 41. The axial direction of the axial fan 3 is along, for example, the front-rear direction. The laser light source 41 and the wavelength conversion unit 42 are arranged along the axial direction of the axial fan 3. The axial direction of the axial fan 3 can be said to be the rotation axis direction of the axial fan 3, or the direction in which the rotation axis of the axial fan 3 extends. Hereinafter, simply referring to the axial direction, the axial direction means the axial direction of the axial fan 3.

[0028] The laser light source 41 is located forward of the wavelength conversion unit 42. The laser light source 41 is closer to the front wall portion 201 than the wavelength conversion unit 42, and the wavelength conversion unit 42 is closer to the rear wall portion 202 than the laser light source 41.

[0029] The laser light L2 emitted rearward from the laser light source 41 passes through the optical system 43 and is irradiated onto the wavelength conversion unit 42 behind the laser light source 41. For example, the laser light L2 passes through at least one first lens and a wavelength separation filter 430 included in the optical system 43 and is irradiated onto the wavelength conversion unit 42.

[0030] The wavelength conversion unit 42 includes a phosphor. The laser light L2 serves as excitation light that excites the phosphor included in the wavelength conversion unit 42. In response to irradiation with the laser light L2, the wavelength conversion unit 42 emits fluorescence L3 having a wavelength spectrum different from that of the laser light L2 toward the optical system 43. The peak wavelength of the fluorescence L3 is, for example, longer than the peak wavelength of the laser light L2, and the fluorescence L3 is visible light. The fluorescence L3 is used as the illumination light L1. The wavelength conversion unit 42 may be plate-shaped or may have another shape.

[0031] The fluorescence L3 emitted by the wavelength conversion unit 42 is reflected by the wavelength separation filter 430 of the optical system 43 and directed toward the exit 403 provided in the second portion 402. The wavelength separation filter 430 can also be said to be a reflective member that reflects the fluorescence L3. The fluorescence L3 reflected by the wavelength separation filter 430 passes through at least one second lens of the optical system 43 and is emitted from the exit 403 to the outside of the housing 40. Then, the fluorescence L3 (i.e., the illumination light L1) emitted from the exit 403 is emitted from the exit 25 of the housing 2 of the lighting device 1 to the outside of the housing 2.

[0032] The wavelength conversion unit 42 is made of a wavelength conversion material (i.e., a phosphor material) that converts the laser light L2 into blue light. For example, BaMgAl 10 O 17 :Eu, or (Sr,Ca,Ba) 10 (PO4)6Cl2:Eu,(Sr,Ba) 10 (PO4)6C l2 The wavelength conversion unit 42 may contain, for example, (Sr,Ba,Ca)5(PO4)3Cl:Eu,Sr4Al as a wavelength conversion material that converts the laser light L2 into blue-green light. 14 O 25 The wavelength conversion unit 42 may contain, for example, SrSi2(O,Cl)2N2:Eu, (Sr,Ba,Mg)2SiO4:Eu, etc. as a wavelength conversion material that converts the laser light L2 into green light. 2+ The wavelength conversion unit 42 may contain, for example, Y2O2S:Eu, Y2O3:Eu, SrCaClAlSiN3:Eu as a wavelength conversion material that converts the laser light L2 into red light. 2+ , CaAlSiN3:Eu, CaAlSi(ON)3:Eu, or the like. The wavelength conversion unit 42 may contain 3Ga5O 12 : Cr etc. may be included.

[0033] If the wavelength conversion unit 42 contains multiple types of wavelength conversion materials corresponding to multiple colors of light, the wavelength conversion unit 42 can emit fluorescence L3 with high color rendering. For example, if the laser light L2 is light having a peak at 380 nm to 415 nm and the wavelength conversion unit 42 contains three types of phosphors that emit red, green, and blue light, respectively, when irradiated with the laser light L2, the color rendering of the fluorescence L3 can be improved. The wavelength conversion unit 42 may contain a resin such as a binder for binding fine particles of the phosphors together.

[0034] The heat diffusion member 46 is, for example, a plate-shaped member. For example, the heat diffusion member 46 is fixed to the first part 401 of the housing 40 so as to close the opening on the rear side of the first part 401. The wavelength conversion unit 42 is fixed to the front surface of the heat diffusion member 46. The rear surface of the heat diffusion member 46 is fixed to the inner surface (in other words, the front surface) of the rear wall part 202 of the housing 2.

[0035] The heat diffusion member 46 spreads the heat generated by the wavelength conversion unit 42 irradiated with the laser light L2 in a planar direction perpendicular to the thickness direction of the heat diffusion member 46 and transmits it to the rear wall unit 202. The heat transmitted to the rear wall unit 202 is released into the atmosphere from a plurality of heat dissipation fins 211 of a heat dissipation structure 210 provided on the outer surface of the rear wall unit 202. As a result, the wavelength conversion unit 42 is cooled by the heat dissipation structure 210. The heat diffusion member 46 is made of, for example, a metal with high thermal conductivity. The heat diffusion member 45 may be made of, for example, copper or a copper alloy, or may be made of aluminum or an aluminum alloy.

[0036] The heat diffusion member 45 is, for example, a plate-shaped member. For example, the heat diffusion member 45 is fixed to the first part 401 of the housing 40 so as to close the front opening of the first part 401. The laser light source 41 is fixed to the rear surface of the heat diffusion member 45, and the heat dissipation member 48 is fixed to the front surface of the heat diffusion member 45. The heat diffusion member 45 spreads the heat generated by the laser light source 41 in a plane direction perpendicular to the thickness direction of the heat diffusion member 45 and transfers it to the heat dissipation member 48. The heat dissipation member 48 releases the heat transferred from the heat diffusion member 45 into the atmosphere. The heat diffusion member 45 is, for example, made of a metal with high thermal conductivity. The heat diffusion member 45 may be, for example, made of copper or a copper alloy, or may be, for example, made of aluminum or an aluminum alloy.

[0037] The heat dissipation member 48 is located, for example, outside the housing 40. For example, the heat dissipation member 48 is located forward of the housing 40, and the heat dissipation member 48 is, for example, a fin-type heat dissipation member. The heat dissipation member 48 is made of, for example, a metal with high thermal conductivity. The heat dissipation member 48 may be made of, for example, copper or a copper alloy, or may be made of aluminum or an aluminum alloy.

[0038] The heat dissipation member 48 includes, for example, a plate-shaped fixed portion (also referred to as a base portion) 481 fixed to the heat diffusion member 45, and a plurality of plate-shaped heat dissipation fins 482 standing on the fixed portion 481. The fixed portion 481 and the plurality of heat dissipation fins 482 are, for example, integrally formed. Heat generated by the laser light source 41 is spread by the heat diffusion member 45 and then transferred to the fixed portion 481. Then, the heat generated by the laser light source 41 is transferred from the fixed portion 481 to the plurality of heat dissipation fins 482 and released from the plurality of heat dissipation fins 482 into the atmosphere.

[0039] The heat dissipation fins 482 are aligned in a line in the vertical direction so that their thickness direction is along the vertical direction. Each heat dissipation fin 482 extends in a planar shape in the front-rear and left-right directions. Two adjacent heat dissipation fins 482 face each other in the vertical direction.

[0040] The axial flow fan 3 draws in air outside the housing 2 in the axial direction through the housing air inlet 20, and discharges the drawn-in air in the axial direction. The plate-shaped fixed part 481 has a thickness direction aligned with the axial direction of the axial flow fan 3. The fixed part 481 is disposed so as to face the flow of air discharged from the axial flow fan 3.

[0041] The air discharged from the axial fan 3, that is, the air taken in by the axial fan 3 from the outside to the inside of the housing 2, directly hits the heat dissipation member 48. The air that hits the heat dissipation member 48 passes through gaps between the multiple heat dissipation fins 482 and flows toward the right wall portion 203 and the left wall portion 204 of the housing 2. Then, the air is exhausted to the outside of the housing 2 from the two exhaust parts 23 provided on the right wall portion 203 and the left wall portion 204, respectively. This cools the heat dissipation member 48, improving the cooling effect of the heat dissipation member 48 on the laser light source 41.

[0042] The configuration of the light emitting device 4 is not limited to the above example. For example, the laser light L2 emitted by the laser light source 41 may be reflected by the wavelength separation filter 430 and irradiated onto the wavelength conversion unit 42. Fig. 6 is a schematic diagram showing an example of the state inside the housing 2 in this case.

[0043] In the example of FIG. 6, the light emitting device 4 includes a housing 40A that houses a laser light source 41, a wavelength conversion unit 42, an optical system 43, a heat diffusion member 45, and a heat diffusion member 46, instead of the housing 40 described above. The housing 40A includes, for example, a cylindrical first portion 411 with both ends open, and a cylindrical second portion 412 that is connected to the first portion 411 and has both ends open. The internal space of the first portion 411 and the internal space of the second portion 412 are connected. The first portion 411 houses, for example, the wavelength conversion unit 42, the optical system 43, and the heat diffusion member 46. The second portion 412 houses, for example, the laser light source 41 and the heat diffusion member 45.

[0044] The first portion 411 extends, for example, in the up-down direction. The wavelength conversion unit 42 is located above the first portion 411. An opening at one end of the first portion 411 faces upward, and an opening at the other end of the first portion 411 faces downward. The opening at the other end of the first portion 411 functions as an outlet 413 for extracting the illumination light L1 (in other words, the fluorescence L3) emitted by the wavelength conversion unit 42 to the outside of the housing 40A. The illumination light L1 is emitted from the outlet 413 to the outside of the housing 40A, and then emitted from the outlet 25 of the housing 2 to the outside of the housing 2.

[0045] The second portion 412, for example, extends forward from the peripheral wall of the first portion 411. An opening at one end of the second portion 412 faces rearward and is connected to the internal space of the first portion 411. An opening at the other end of the second portion 412 faces forward.

[0046] The heat diffusion member 46 is fixed to the first portion 411 so as to close the upper opening of the first portion 411. The wavelength conversion unit 42 is fixed to the lower surface of the heat diffusion member 46. The upper surface of the heat diffusion member 46 is fixed to the inner surface of the upper wall portion 205 of the housing 2.

[0047] In this example, the multiple heat dissipation fins 211 of the heat dissipation structure 210 are provided on the outer surface of the upper wall portion 205 of the housing 2. The heat diffusion member 46 spreads the heat generated by the wavelength conversion portion 42 in a planar direction perpendicular to the thickness direction of the heat diffusion member 46 and transmits it to the upper wall portion 205. The heat transmitted to the upper wall portion 205 is released into the atmosphere from the multiple heat dissipation fins 211 of the heat dissipation structure 210 provided on the outer surface of the upper wall portion 205.

[0048] The heat diffusion member 45 is fixed to the second portion 412 so as to close the front opening of the second portion 412. The laser light source 41 is fixed to the rear surface of the heat diffusion member 45, and the heat dissipation member 48 is fixed to the front surface of the heat diffusion member 45.

[0049] The heat dissipation member 48 is disposed, for example, in the same manner as in the example of Fig. 5 described above. The air discharged from the axial flow fan 3 directly hits the heat dissipation member 48. The air that hits the heat dissipation member 48 passes through gaps between the heat dissipation fins 482 and is exhausted to the outside of the housing 2 from two exhaust parts 23 provided on the right wall part 203 and the left wall part 204, respectively.

[0050] The optical system 43 housed in the first portion 411 is located between the wavelength conversion unit 42 and the emission port 413. The optical system 43 includes a wavelength separation filter 430, at least one first lens located closer to the wavelength conversion unit 42 than the wavelength separation filter 430, and at least one second lens located closer to the emission port 413 than the wavelength separation filter 430.

[0051] In the example of FIG. 6, the laser light source 41 and the wavelength conversion unit 42 are not aligned in the optical axis direction of the laser light source 41. The laser light source 41 is located closer to the axial fan 3 than the wavelength conversion unit 42. The laser light L2 emitted from the laser light source 41 to the rear side is reflected upward by the wavelength separation filter 430. Then, the laser light L2 passes through at least one first lens of the optical system 43 and is irradiated to the wavelength conversion unit 42. The illumination light L1 (in other words, the fluorescence L3) emitted downward by the wavelength conversion unit 42 passes through at least one first lens, the wavelength separation filter 430, and at least one second lens of the optical system 43 in this order, and is emitted to the outside of the housing 40A from the exit 413 of the housing 40A. Then, the illumination light L1 is emitted to the outside of the housing 2 from the exit 25 of the housing 2.

[0052] The configuration of the heat dissipation member 48 is not limited to the above example. For example, the heat dissipation fins 482 may be arranged in a row along the left-right direction so that their thickness direction is along the left-right direction. In this case, the two exhaust sections 23 may be provided on the upper wall section 205 and the lower wall section 206, respectively. In this case, the air that hits the heat dissipation member 48 flows toward the upper wall section 205 and the lower wall section 206 of the housing 2 through the gaps between the multiple heat dissipation fins 482. Then, the air is exhausted to the outside of the housing 2 from the two exhaust sections 23 provided on the upper wall section 205 and the lower wall section 206, respectively.

[0053] Moreover, the heat dissipation member 48 may include a plurality of heat dissipation pins instead of the plurality of heat dissipation fins 482. The plurality of heat dissipation pins included in the heat dissipation member 48 may be arranged in a matrix with the left-right direction as the row direction and the up-down direction as the column direction, for example. In this case, the right wall portion 203, the left wall portion 204, the upper wall portion 205, and the lower wall portion 206 may each be provided with an exhaust portion 23. In this case, the air that hits the heat dissipation member 48 passes between the plurality of heat dissipation pins and is exhausted to the outside of the housing 2 from the exhaust portions 23 of the right wall portion 203, the left wall portion 204, the upper wall portion 205, and the lower wall portion 206.

[0054] Furthermore, the air taken into the housing 2 by the axial flow fan 3 and moving toward the rear side may continue to flow rearward even after hitting the heat dissipation member 48, and may be exhausted to the outside of the housing 2 from the rear wall portion 202. Figure 7 is a schematic diagram showing an example of the state inside the housing 2 in this case.

[0055] 7, similarly to the example of FIG. 5, the light emitting device 4 includes a housing 40. A first portion 401 of the housing 40 extends in the up-down direction. A second portion 402 of the housing 40 extends from a peripheral wall of the cylindrical first portion 401 to the right (the front side of the paper in FIG. 7) or the left side (the rear side of the paper in FIG. 7). An exit port 25 from which the illumination light L1 is emitted is provided in a right wall portion 203 or a left wall portion 204 of the housing 2.

[0056] The laser light source 41 in the first portion 401 is located closer to the axial fan 3 than the wavelength conversion unit 42 in the first portion 401. The wavelength conversion unit 42 is located lower than the laser light source 41. The heat diffusion member 46 to which the wavelength conversion unit 42 is fixed is fixed to the bottom wall portion 206 of the housing 2. A heat dissipation structure 210 that dissipates heat generated by the wavelength conversion unit 42 is provided on the outer surface of the bottom wall portion 206.

[0057] The laser light L2 emitted downward by the laser light source 41 passes through the optical system 43 and is irradiated onto the wavelength conversion unit 42 below the optical system 43. The illumination light L1 (in other words, the fluorescence L3) emitted upward by the wavelength conversion unit 42 is reflected toward the right or left by the wavelength separation filter 430 of the optical system 43. The illumination light L1 is then emitted to the outside of the housing 2 from the emission port 25 provided in the right wall portion 203 or the left wall portion 204 of the housing 2.

[0058] In the example of Fig. 7, the exhaust section 23 is provided on the rear wall section 202 of the housing 2. Also, in the example of Fig. 7, the thickness direction of the plate-shaped fixing section 481 of the heat dissipation member 48 is aligned along a direction perpendicular to the axial direction of the axial fan 3. The fixing section 481 of the heat dissipation member 48 is disposed along the air exhaust direction of the axial fan 3 (i.e., the direction from the front side to the rear side). In other words, the plate-shaped fixing section 481 is disposed so as to spread out in a plane along the axial direction of the axial fan 3. The multiple heat dissipation fins 482 are aligned in a row along the left-right direction so that their thickness direction is aligned along the left-right direction.

[0059] 7, the air taken in and discharged by the axial fan 3 into the housing 2 flows rearward toward the heat dissipation member 48. The air taken into the housing 2 hits the plurality of heat dissipation fins 482 and passes between the plurality of heat dissipation fins 482, thereby cooling the heat dissipation member 48. After cooling the heat dissipation member 48, the air taken into the housing 2 continues to flow rearward, and is discharged to the outside of the housing 2 from the exhaust unit 23 provided in the rear wall portion 202.

[0060] Even when the light-emitting device 4 has a housing 40A shown in FIG. 6, the heat dissipation member 48 may be arranged in a manner similar to the example in FIG. 7, and the air taken into the housing 2 may flow toward the rear even after cooling the heat dissipation member 48, and be exhausted to the outside of the housing 2 through the exhaust section 23 of the rear wall portion 202.

[0061] 5, the positions of the laser light source 41 and the heat diffusion member 45 and the positions of the wavelength conversion unit 42 and the heat diffusion member 46 may be interchanged, and the heat diffusion member 46 may be fixed to a fixing portion 481 of the heat diffusion member 48. In this case, the heat diffusion member 45 is fixed to the rear wall portion 202 of the housing 2, and the heat generated by the laser light source 41 is released into the atmosphere from the heat dissipation structure 210 of the housing 2.

[0062] Furthermore, the light emitting device 4 may include a heat dissipation member (also referred to as a second heat dissipation member) that dissipates heat generated in the wavelength conversion unit 42, which serves as a substitute for the heat dissipation structure 210, in addition to the heat dissipation member 48 that dissipates heat generated in the laser light source 41. In this case, the heat diffusion member 46 is not fixed to the housing 2, but is fixed to the second heat dissipation member inside the housing 2. When the light emitting device 4 includes the heat dissipation member 48 and the second heat dissipation member, the light emitting device 4 may be disposed inside the housing 2 such that the air discharged from the axial fan 3 directly hits the second heat dissipation member.

[0063] <Example of axial fan configuration> 8 to 10 are schematic perspective views showing an example of an axial fan 3. Fig. 8 shows an example of an axial fan 3 fixed to a front wall 201 of a housing 2. In Fig. 8, only the front wall 201 of the housing 2 is shown. Fig. 9 shows an example of the axial fan 3 as viewed from the exhaust side. Fig. 10 shows an example of the axial fan 3 as viewed from the intake side.

[0064] As shown in Figs. 8 to 10 etc., the axial fan 3 includes, for example, a casing 30, and an impeller 32 and a motor 34 inside the casing 30. The axial fan 3 is fixed to the housing 2 by fixing the casing 30 to the front wall portion 201. The casing 30 is also called a frame, for example. The casing 30 may be made of at least one of resin and metal, for example. The impeller 32 may be made of at least one of resin and metal, for example. Hereinafter, the casing 30 may be called a fan casing 30.

[0065] The motor 34 can rotate the impeller 32. The motor 34 may be, for example, a brushless DC motor or another type of motor. The impeller 32 includes a plurality of blades 320 and a boss 321 to which the plurality of blades 320 are connected. When the boss 321 is viewed from the intake side, the outer shape of the boss 321 is, for example, circular. The plurality of blades 320 are positioned around the boss 321. The rotating shaft of the motor 34 is fixed to the boss 321. The boss 321 rotates in response to the rotation of the motor 34, and the plurality of blades 320 rotate due to the rotation of the boss 321. The axial direction of the axial flow fan 3 can also be said to be the direction in which the rotating shaft of the motor 34 extends.

[0066] The casing 30 has an intake port 300 (also called a fan intake port 300) for taking in air into the casing 30 by the rotation of the impeller 32. The casing 30 also has an exhaust port 310 (also called a fan exhaust port 310) for discharging the air taken into the casing 30 to the outside of the casing 30 by the rotation of the impeller 32. The intake port 300 and the exhaust port 310 face each other in the axial direction. When the axial fan 3 is viewed from the intake side, the impeller 32 is exposed from the fan intake port 300 and is visible.

[0067] The shape of edge 301 of intake port 300 (see FIG. 10) and edge 311 of exhaust port 310 (see FIG. 9) are, for example, polygonal. The shapes of edges 301 and 311 are, for example, octagonal. The shape and size of edge 301 may be the same as the shape and size of edge 311.

[0068] However, the shapes of edges 301 and 311 are not limited to this. For example, edges 301 and 311 may be circular. Furthermore, the shape of edge 301 and the shape of edge 311 may be different from each other. Furthermore, although the shape of edge 301 and the shape of edge 311 are the same, the size of edge 301 and the size of edge 311 may be different from each other.

[0069] The axial flow fan 3 takes in air from a fan intake port 300 into the casing 30 by the rotation of the impeller 32. Then, the axial flow fan 3 expels the air taken in the casing 30 from an exhaust port 310 by the rotation of the impeller 32.

[0070] The casing 30 is fixed to the front wall portion 201 by using, for example, a plurality of fixing screws 50. For example, four fixing screws 50 are used to fix the casing 30. The fixing screws 50 are, for example, bolts.

[0071] The outer edge of the casing 30 when viewed from the intake side and the exhaust side (in other words, the outer shape of the casing 30 when viewed from the intake side and the exhaust side) forms, for example, a rectangle with rounded corners. Four through holes 315 through which four fixing screws 50 are respectively inserted are provided at the four corners of the casing 30. Each through hole 315 penetrates the casing 30 from the intake side to the exhaust side. Each through hole 315 extends from a corner of the intake side surface of the casing 30 to a corner of the exhaust side surface of the casing 30. The number of fixing screws 50 and the number of through holes 315 may be other than four.

[0072] Fan casing 30 is fixed to front wall 201 so that fan intake port 300 faces housing intake port 20 provided in front wall 201 of housing 2. Each fixing screw 50 is inserted through front wall 201 from the outside of front wall 201 and into through hole 315. Then, a nut 51 is attached to a portion of each fixing screw 50 that protrudes from fan casing 30 to the exhaust side, as shown in FIG. 8. In this way, fan casing 30 is fixed to front wall 201 from the inside of housing 2.

[0073] 8, an anti-vibration washer 52 may be provided between the nut 51 and the casing 30. The fixing screw 50 passes through the anti-vibration washer 52 so as to come into contact with the anti-vibration washer 52. The anti-vibration washer 52 can also be said to be a vibration-isolating material that comes into contact with the casing 30 and the fixing screw 50. The anti-vibration washer 52 may be made of natural rubber, synthetic rubber, elastomer gel, foam material, or the like. As the synthetic rubber for the anti-vibration washer 52, for example, urethane rubber, silicone rubber, chloroprene rubber, or the like may be adopted.

[0074] In this way, when the lighting device 1 is provided with vibration-proof material that contacts the casing 30 and the fixing screw 50, vibrations generated in the casing 30 when the impeller 32 rotates are less likely to be transmitted to the housing 2 via the fixing screw 50.

[0075] When the impeller 32 of the axial fan 3 fixed to the front wall portion 201 from inside the housing 2 rotates, air outside the housing 2 passes through the housing air inlet 20 and the fan air inlet 300 in this order and is taken into the casing 30. The air taken into the casing 30 is exhausted to the outside of the casing 30 from the exhaust port 310 by the rotation of the impeller 32. The air exhausted from the exhaust port 310 hits the heat dissipation member 48 of the light emitting device 4, and is then exhausted to the outside of the housing 2 from the exhaust section 23.

[0076] The fixing screw 50 may be something other than a bolt. For example, the fixing screw 50 may be a screw. In this case, a female thread is provided on the inner surface of the through hole 315, and the lighting device 1 does not need to include the nut 51.

[0077] In this example, as shown in Fig. 4, when the housing inlet 20 and the fan inlet 300 are viewed from the axial direction of the axial fan 3, the edge of the housing inlet 20 is located outside the edge 301 of the fan inlet 300. Specifically, when the housing inlet 20 and the fan inlet 300 are viewed from the axial direction of the axial fan 3, the inner circumferential surface 21 of the housing inlet 20, which constitutes the edge of the housing inlet 20, is located outside the edge 301 of the fan inlet 300. Also, when the housing inlet 20 and the exhaust port 310 of the axial fan 3 are viewed from the axial direction of the axial fan 3, the edge of the housing inlet 20 (i.e., the inner circumferential surface 21) is located outside the edge 311 of the exhaust port 310. Hereinafter, the inner circumferential surface 21 of the housing inlet 20 may be referred to as the edge 21 of the housing inlet 20.

[0078] Thus, in this example, when the housing air inlet 20 and the fan air inlet 300 are viewed from the axial direction of the axial fan 3, the edge 21 (specifically, the entire edge 21) of the housing air inlet 20 is located outside the edge 301 (specifically, the entire edge 301) of the fan air inlet 300. This makes it easier to take in air outside the housing 2 into the fan casing 30 through the housing air inlet 20. This increases the amount of air discharged from the fan casing 30, improving the cooling effect on the light emitting device 4. This improves the cooling effect of the axial fan 3.

[0079] <About the partition> Fig. 11 is a schematic diagram showing an example of a state in which the lighting device 1 is viewed in the axial direction from the front side with the multiple fixing screws 50 removed. As shown in Fig. 11 and the above-mentioned Fig. 4 etc., the lighting device 1 may include a partition section 80 that divides the housing air intake 20 into multiple opening regions 120 when the housing air intake 20 is viewed in the axial direction from the outside of the housing 2, for example.

[0080] The impeller 32 of the axial fan 3 fixed to the inner surface of the front wall 201 faces the housing air inlet 20 in the front-rear direction (in other words, the axial direction of the axial fan 3). The boss 321 of the impeller 32 faces the center of the housing air inlet 20 in the front-rear direction.

[0081] The partition part 80 has, for example, an opposing part 81 that faces the boss 321 of the impeller 32. The partition part 80 also has a plurality of ribs 82 that extend from the opposing part 81 toward the edge 21 of the housing intake port 20 when the partition part 80 is viewed in the axial direction from outside the lighting device 1. The front wall part 201 and the partition part 80 can be said to be a front part 100 that constitutes the front side of the lighting device 1.

[0082] The facing portion 81 is, for example, disk-shaped according to the outer shape of the boss 321 as viewed from the intake side of the axial flow fan 3. The outer shape of the facing portion 81 as viewed from the front-rear direction is circular. The multiple ribs 82 are, for example, arranged at equal intervals around the facing portion 81. Each rib 82 extends, for example, from the facing portion 81 along the radial direction of the housing intake port 20 to the edge 21 of the housing intake port 20 and is connected to the front wall portion 201. Each rib 82 is, for example, elongated and plate-shaped. The partition portion 80 is, for example, located within the housing intake port 20 and is formed integrally with the front wall portion 201 of the housing 2. In this case, the partition portion 80 can be considered to be a part of the housing 2, specifically a part of the front wall portion 201. In other words, it can be said that the front wall portion 201 of the housing 2 has the partition portion 80.

[0083] The partition 80 includes, for example, four ribs 82. The air intake 20 is partitioned by the partition 80 into, for example, four opening regions 120. When the lighting device 1 is viewed from the front side in the axial direction, the four opening regions 120 are located around the opposing portion 81. In this example, a space surrounded by the opposing portion 81, the front wall portion 201, and two ribs 82 adjacent to each other in the circumferential direction of the air intake 20 that extend from the opposing portion 81 to the front wall portion 201 constitutes one opening region 120. Hereinafter, viewing the lighting device 1 from the front side in the axial direction may be referred to as a plan view from the front side.

[0084] 4 and 11, in plan view from the front side, the boss 321 of the axial fan 3 is located behind the opposing part 81 of the partition part 80 and is not visible. In plan view from the front side, the blades 320 connected to the boss 321 are exposed from the opening areas 120 and are visible. Each opening area 120 is sized such that, for example, a person's finger cannot enter the opening area 120 from outside the lighting device 1.

[0085] When the impeller 32 of the axial fan 3 rotates, air outside the housing 2 is drawn into the housing 2 through each opening area 120. The air drawn into the housing 2 passes through the intake port 300 and the exhaust port 310 of the axial fan 3 and hits the light-emitting device 4.

[0086] In this way, lighting device 1 includes partition portion 80 that divides housing air intake 20 into a plurality of opening regions 120 in a plan view from the front side, so that foreign matter is less likely to enter housing 2 through housing air intake 20. This makes it less likely that foreign matter will come into contact with impeller 32 and impede the rotation of impeller 32. Furthermore, if partition portion 80 includes opposing portion 81 that faces boss 321, it becomes less likely that foreign matter will come into contact with boss 321 from outside housing 2 when impeller 32 is rotating.

[0087] In this example, as shown in FIG. 11, a front portion 100 consisting of the front wall portion 201 and the partition portion 80 is provided with a plurality of through holes 85 through which a plurality of fixing screws 50 are respectively passed. The front portion 100 is provided with, for example, four through holes 85. The through holes 85 correspond one-to-one with the through holes 315 provided in the fan casing 30. The corresponding through holes 85 and the through holes 315 overlap in the front-rear direction. Each fixing screw 50 is passed through the through holes 85 and the through holes 315 in order from the outside of the front portion 100 of the lighting device 1. Then, a nut 51 is attached to a portion of each fixing screw 50 that protrudes from the casing 30 to the exhaust side.

[0088] The plurality of ribs 82 of the partition portion 80 are provided, for example, in the same number as the plurality of through holes 85, and correspond one-to-one to the plurality of through holes 85. For example, each through hole 85 is provided straddling the corresponding rib 82 and the front wall portion 201. One through hole 85 is provided straddling an end of one rib 82 on the front wall portion 201 side and a portion of the front wall portion 201 to which the one rib 82 is connected. Parts of the four through holes 85 are provided in each of the four ribs 82.

[0089] Here, in this example, the size of the outer shape of the fan casing 30 (specifically, the outer shape as seen from the axial direction) is not set to be much larger than the outer shapes of the fan intake port 300 and the fan exhaust port 310. Therefore, as in this example, when the edge 21 of the housing intake port 20 is positioned outside the edge 301 of the fan intake port 300 in a plan view from the front side, it may not be possible to provide the through hole 85 facing the through hole 315 provided at the end of the fan casing 30 in the front-rear direction outside the housing intake port 20. In other words, it may not be possible to provide the through hole 85 only in the front wall portion 201.

[0090] Therefore, in this example, the ribs 82 of the partition portion 80 are used to ensure the through holes 85. In other words, the ribs 82 are provided so as to ensure the through holes 85. As a result, in a case where the outer shape of the fan casing 30 is not significantly larger than the outer shapes of the fan intake port 300 and the fan exhaust port 310 as in this example, even if the edge 21 of the housing intake port 20 is positioned outside the edge 301 of the fan intake port 300 in a plan view from the front side, it is possible to provide the through holes 85 that face the through holes 315 provided at the end of the fan casing 30 in the front-rear direction.

[0091] Depending on the relationship between the size and shape of the housing intake port 20 and the size and shape of the outer shape of the fan casing 30, at least one of the multiple through holes 85 may be provided only in the rib 82, or may be provided only in the front wall portion 201. The multiple ribs 82 may include a rib 82 in which at least a portion of the through hole 85 is provided.

[0092] In this example, inner peripheral surface 21 of housing air inlet 20 (in other words, edge 21 of housing air inlet 20) has an inclined surface that inclines toward the outside of housing air inlet 20 from the inside of housing 2 to the outside of housing 2. Fig. 12 is a schematic diagram showing an example of the cross-sectional structure of front portion 100 in the direction of arrow AA shown in Fig. 11.

[0093] As shown in FIG. 12, the inner circumferential surface 21 of the housing air intake 20 is inclined with respect to the front-rear direction (the up-down direction on the paper surface of FIG. 12). The inner circumferential surface 21 is inclined toward the outside of the housing air intake 20 from the inside of the housing 2 to the outside of the housing 2. In other words, the inner circumferential surface 21 is inclined toward the outside of the housing air intake 20 from the rear side to the front side. In further words, the inner circumferential surface 21 is inclined toward the outside of the housing air intake 20 from the back side to the front side when the housing air intake 20 is viewed in the axial direction from the front side. It can also be said that the inner circumferential surface 21 is inclined so as to expand in diameter from the inside of the housing 2 to the outside of the housing 2. The cross-sectional shape of the inner circumferential surface 21 along the front-rear direction is an inclined straight line inclined toward the outside of the housing air intake 20 from the rear side to the front side.

[0094] Since the inner peripheral surface 21 is inclined toward the outside of the housing air inlet 20 from the inside of the housing 2 to the outside of the housing 2, the opening diameter of the front end of the housing air inlet 20 is larger than the opening diameter of the rear end of the housing air inlet 20. The housing air inlet 20 increases in diameter from the rear side to the front side.

[0095] The cross-sectional shape of inner circumferential surface 21 along the front-rear direction may be an inclined curve inclined from the rear side to the front side toward the outside of housing air intake 20. In this example, the entire area of ​​inner circumferential surface 21 forms an inclined surface inclined from the rear side to the front side toward the outside of housing air intake 20, but inner circumferential surface 21 may partially form an inclined surface inclined from the rear side to the front side toward the outside of housing air intake 20.

[0096] 4 and 11, the partition portion 80 has an edge portion 180 that defines each opening region 120 when the partition portion 80 is viewed in the axial direction from outside the lighting device 1. The partition portion 80 has four edge portions 180 that define the four opening regions 120, respectively. In a plan view from the front side, one edge portion 180 defines one opening region 120 together with the inner peripheral surface 21 of the housing intake port 20. Hereinafter, one opening region 120 to be described may be referred to as a target opening region 120.

[0097] As described above, in this example, the space surrounded by the opposing portion 81 of the partition portion 80, the front wall portion 201, and two adjacent ribs 82 extending from the opposing portion 81 to the front wall portion 201 in the circumferential direction of the intake port 20 constitutes one opening area 120.

[0098] Here, two ribs 82 adjacent to each other in the circumferential direction of the intake port 20 that define the target opening region 120 are referred to as the first defining rib 82 and the second defining rib 82. Of both side surfaces 82a (see Figs. 4 and 11) in the width direction of the elongated plate-like first defining rib 82, the side surface 82a on the second defining rib 82 side is referred to as the first opening defining surface 82a. Of both side surfaces 82a in the width direction of the elongated plate-like second defining rib 82, the side surface 82a on the first defining rib 82 side is referred to as the second opening defining surface 82a. The width direction of the rib 82 is perpendicular to the longitudinal direction and thickness direction of the rib 82. Of the peripheral side surfaces (also referred to as peripheral end surfaces) 81a of the disk-like opposing portion 81, the portion between the first opening defining surface 82a and the second opening defining surface 82a is referred to as the third opening defining surface.

[0099] In this example, one edge 180 (also referred to as target edge 180) that defines the target opening area 120 when viewed in a plan view from the front side is composed of three surfaces: a first opening definition surface 82a of the first defining rib 82, a second opening definition surface 82a of the second defining rib 82, and a third opening definition surface of the opposing portion 81.

[0100] In this example, each edge 180 has an inclined surface that inclines toward the outside of the opening region 120 from the rear side to the front side when the partition portion 80 is viewed in the axial direction from the outside of the lighting device 1. Fig. 13 is a schematic diagram showing an example of the cross-sectional structure of the rib 82 in the view of the arrow BB shown in Fig. 11.

[0101] 12, in this example, the peripheral side surface 81a of the facing portion 81 is inclined with respect to the thickness direction of the facing portion 81 (the up-down direction on the paper surface of FIG. 12). The peripheral side surface 81a is inclined toward the inside of the facing portion 81 from the rear side to the front side. The cross-sectional shape of the facing portion 81 along the thickness direction is, for example, a trapezoid. The cross-sectional shape of the peripheral side surface 81a along the front-rear direction is an inclined straight line that inclines toward the inside of the facing portion 81 from the rear side to the front side.

[0102] The cross-sectional shape of the peripheral side surface 81a along the front-rear direction may be an inclined curve inclined from the rear side to the front side toward the inside of the facing portion 81. In this example, the entire area of ​​the peripheral side surface 81a is inclined from the rear side to the front side toward the inside of the facing portion 81, but the peripheral side surface 81a may partially configure an inclined surface inclined from the rear side to the front side toward the inside of the facing portion 81.

[0103] As shown in Fig. 13, in this example, both side surfaces 82a of the rib 82 in the width direction are inclined with respect to the thickness direction of the rib 82 (the up-down direction on the paper surface of Fig. 13). Each side surface 82a of the rib 82 is inclined toward the inside of the rib 82 from the rear side to the front side. The cross-sectional shape of the rib 82 in the width direction is, for example, a trapezoid. Each side surface 82a of the rib 82 is an inclined plane that is inclined toward the inside of the rib 82 from the rear side to the front side.

[0104] Each side surface 82a of the rib 82 may be an inclined curved surface that inclines toward the inside of the opposing portion 81 from the rear side to the front side. In this example, each of the two side surfaces 82a of the rib 82 is inclined toward the inside of the rib 82 from the rear side to the front side, but only one of the two side surfaces 82a may be inclined toward the inside of the rib 82 from the rear side to the front side. Instead of forming an inclined surface that inclines toward the inside of the rib 82 from the rear side to the front side of the entire region of one side surface 82a, one side surface 82a may partially form an inclined surface that inclines toward the inside of the rib 82 from the rear side to the front side.

[0105] As described above, the target edge portion 180 is composed of the first opening definition surface 82a of the first definition rib 82, the second opening definition surface 82a of the second definition rib 82, and the third opening definition surface which is a part of the peripheral side surface 81a of the facing portion 81. The side surface 82a of the rib 82 is inclined toward the inside of the rib 82 from the rear side to the front side, and the peripheral side surface 81a of the facing portion 81 is inclined toward the inside of the facing portion 81 from the rear side to the front side. Therefore, the target edge portion 180 that defines the target opening region 120 forms an inclined surface that is inclined toward the outside of the target opening region 120 from the rear side to the front side. In other words, the target edge portion 180 forms an inclined surface that is inclined toward the outside of the target opening region 120 from the back side to the front side when the partition portion 80 is viewed in the axial direction from the outside of the lighting device 1.

[0106] In this example, the entire area of ​​the target edge portion 180 forms an inclined surface that slopes outward from the opening region 120 from the rear side to the front side, but the target edge portion 180 may partially form an inclined surface that slopes outward from the opening region 120 from the rear side to the front side. In this case, for example, the first opening defining surface 82a may not be inclined with respect to the front-rear direction, the second opening defining surface 82a may not be inclined with respect to the front-rear direction, and the third opening defining surface may not be inclined with respect to the front-rear direction. In addition, the multiple edges 180 may include an edge portion 180 that does not have an inclined surface that slopes outward from the opening region 120 from the rear side to the front side.

[0107] In this example, since the partition portion 80 is located in the housing intake port 20 and is formed integrally with the front wall portion 201, it can be said that the inner peripheral surface of the target opening area 120 has an inclined surface that inclines from the rear side to the front side toward the outside of the target opening area 120. Here, the part of the inner peripheral surface 21 of the housing intake port 20 between the first opening definition surface 82a of the first definition rib 82 and the second opening definition surface 82a of the second definition rib 82 is called the fourth opening definition surface. The target opening area 120 is an area surrounded by the first opening definition surface 82a, the second opening definition surface 82a, the third opening definition surface, and the fourth opening definition surface. The inner peripheral surface of the target opening area 120 is composed of four surfaces: the first opening definition surface 82a, the second opening definition surface 82a, the third opening definition surface, and the fourth opening definition surface.

[0108] Thus, in this example, the inner circumferential surface 21 of the housing air inlet 20 has an inclined surface that slopes outward from the housing air inlet 20 from the inside of the housing 2 to the outside of the housing 2. This makes it easier to take air into the housing 2 from the housing air inlet 20. As a result, the cooling effect of the axial fan 3 is improved. Note that the inner circumferential surface 21 does not have to have an inclined surface that slopes outward from the housing air inlet 20 from the rear side to the front side.

[0109] In this example, the edge 180 that defines the opening region 120 when the partition 80 is viewed from outside the lighting device 1 in the axial direction has an inclined surface that inclines outward from the opening region 120 from the rear side to the front side when the partition 80 is viewed from outside the lighting device 1 in the axial direction. This makes it easier to take air into the housing 2 from the opening region 120. As a result, the cooling effect of the axial fan 3 is improved. Note that each of the four edge portions 130 does not have to have an inclined surface that inclines outward from the opening region 120 from the rear side to the front side when the partition 80 is viewed from outside the lighting device 1 in the axial direction.

[0110] The shape of the partition portion 80 is not limited to the above example. For example, at least one opening penetrating the facing portion 81 in the thickness direction of the facing portion 81 may be provided in the facing portion 81. Also, a circular rib connecting the multiple ribs 82 may be provided around the facing portion 81. Also, the multiple open areas 120 may be formed in a mesh pattern.

[0111] In this example, the partition 80 is formed integrally with the housing 2, but may be fixed to the outer surface of the front wall 201 with screws or the like as a separate member from the housing 2. In this case, the partition 80 may be made of the same material as the housing 2, or may be made of a material different from that of the housing 2.

[0112] <About sealing materials> As shown in Figs. 4, 8 and 11, the lighting device 1 may include a sealing member 6 that closes a gap around the fan inlet 300 of the fan casing 30. The sealing member 6 closes a gap between the fan casing 30 and a member located on the intake side (in other words, the front side) of the fan casing 30 relative to the fan casing 30. The sealing member 6 is made of at least one member that does not allow air to pass through. In this example, the sealing member 6 has, for example, a plurality of adhesive tapes 60. The adhesive tapes 60 are made of a material that does not allow air to pass through. In Figs. 4 and 11, the adhesive tapes 60 are indicated with diagonal lines.

[0113] Fig. 14 is a schematic diagram showing an example of a state in which a plurality of adhesive tapes 60 have been removed from the structure shown in Fig. 4. Fig. 15 is a schematic diagram showing an example of a state in which a plurality of adhesive tapes 60 have been removed from the structure shown in Fig. 8, viewed from the rear in the axial direction.

[0114] As shown in Figs. 14 and 15 and Figs. 4 and 11 described above, when the housing air intake 20 is viewed from the axial direction, the housing air intake 20 has an opening area 125 located outside the outer edge 30a of the casing 30. For example, the housing air intake 20 has a plurality of opening areas 125. The outer edge 30a of the casing 30 viewed from the axial direction forms, for example, a rounded rectangle. The plurality of opening areas 125 are, for example, configured with an opening area 125 located on the upper side, an opening area 125 located on the lower side, an opening area 125 located on the right side, and an opening area 125 located on the left side. The plurality of opening areas 125 are included in each of the plurality of opening areas 120.

[0115] The multiple opening regions 125 are located around the fan intake port 300 in a plan view from the front side. The multiple opening regions 125 are located around the fan casing 30 in a plan view from the front side. The multiple opening regions 125 can be said to be gaps located around the fan intake port 300 and through which air passes.

[0116] The seal member 6 closes a plurality of opening regions 125 as gaps around the fan intake port 300. The plurality of opening regions 125 can be said to be gaps around the fan intake port 300 located within the housing intake port 20 when the housing 2 is viewed in the axial direction from the housing intake port 20 side. The plurality of opening regions 125 can also be said to be gaps between the fan casing 30 and the housing 2 located on the intake side of the fan casing 30 relative to the fan casing 30.

[0117] The adhesive tapes 60 of the sealing member 6 each close the opening regions 125. For example, the adhesive tapes 60 close the opening regions 125 from the inside of the housing 2. The adhesive tapes 60 may be single-sided or double-sided adhesive tapes. As shown in FIG. 8, the adhesive tapes 60 are attached across the inner surface (in other words, the rear surface) of the front wall 201 and the peripheral side surface of the fan casing 30 so as to close the entire opening region 125.

[0118] At least a part of the adhesive surface 60a of the adhesive tape 60 may be visible from the outside of the housing 2. That is, the adhesive surface 60a may have an exposed region exposed to the outside of the lighting device 1. In this example, as shown in FIGS. 4 and 11, in a plan view from the front side, a part of the adhesive surface 60a is located inside the opening region 125 and exposed to the outside of the lighting device 1. In this case, the region of the adhesive tape 60 located inside the opening region 125 becomes the exposed region exposed to the outside of the lighting device 1.

[0119] The base material of the adhesive tape 60 is made of an air-impermeable material. For example, the base material of the adhesive tape 60 may be polypropylene, expanded graphite, fluororesin, vinyl, or the like. In the adhesive tape 60, an adhesive surface 60a is formed on one or both sides of the sheet-like base material. The adhesive tape 60 may be replaceable.

[0120] Thus, in this example, the lighting device 1 includes the seal member 6 that seals the gap around the fan inlet 300. This makes it possible to prevent air from passing through the gap around the fan inlet 300 when the axial fan 3 takes in air from the fan inlet 300. This makes it easier for the axial fan 3 to take in air from the fan inlet 300 into the fan casing 30. As a result, the amount of air discharged from the fan exhaust port 310 increases, improving the cooling effect on the light emitting device 4. This improves the cooling effect of the axial fan 3.

[0121] In this example, the size of the outer shape of the fan casing 30 is not set to be much larger than the outer shape of the fan intake port 300. Therefore, when the edge 21 of the housing intake port 20 is positioned outside the edge 301 of the fan intake port 300 in a plan view from the front side, gaps around the fan intake port 300 located within the housing intake port 20 in a plan view from the front side, that is, multiple opening areas 125, may occur. In such a case, the opening areas 125 as gaps are blocked with the seal member 6 (specifically, the adhesive tape 60), so that air is prevented from passing through the opening areas 125 when the axial fan 3 takes air into the housing 2. Therefore, air is easily taken into the casing 30 from the fan intake port 300, and the cooling effect of the axial fan 3 is improved.

[0122] Unlike this example, when the external size of the casing 30 is set to be somewhat larger than the external size of the fan intake port 300, even if the edge 21 of the housing intake port 20 is positioned outside the edge 301 of the fan intake port 300 in a plan view from the front side, the housing intake port 20 may not have an opening region 125 positioned outside the outer edge 30a of the casing 30. In this case, the adhesive tape 60 that covers the opening region 125 is not necessary.

[0123] In this example, the adhesive surface 60a of the adhesive tape 60 has an exposed area that is exposed to the outside of the lighting device 1, and therefore dust on the outside of the lighting device 1 can be collected in the exposed area. This makes it difficult for dust to enter through gaps (e.g., opening area 125) around the fan intake port 300.

[0124] As shown in FIG. 16, the adhesive tape 60 may be attached across the front wall 201 and the intake side surface of the fan casing 30 from the outside of the housing 2 so as to block the opening region 125. In the example of FIG. 16, the upper adhesive tape 60 blocks the opening region 125 from the outside of the housing 2. When the upper adhesive tape 60 is a double-sided adhesive tape, the entire area of ​​the adhesive surface 60a on the opposite side to the opening region 125 side of the upper adhesive tape 60 (i.e., the front adhesive surface 60a) is exposed to the outside of the lighting device 1 and is visible from the outside of the housing 2. In the example of FIG. 16, only one of the four opening regions 125 is blocked from the outside of the housing 2, but two or more opening regions 125 may be blocked from the outside of the housing 2.

[0125] <About the fixed part where the axial fan is fixed to the housing> The front wall 201 of the housing 2 has a fixed portion 201a to which the axial fan 3 is fixed. The fixed portion 201a is, for example, detachable. The fixed portion 201a is attached to the housing 2 so as to close an opening 201b provided in the front wall 201. Each fixing screw 50 is attached to the fixed portion 201a. The housing intake vent 20 is provided in the fixed portion 201a. Each adhesive tape 60 is attached to the fixed portion 201a.

[0126] A user can remove the fixed part 201a from the housing 2 to the outside of the housing 2. Also, a user can attach and fix the removed fixed part 201a to the housing 2. When the fixed part 201a is removed from the housing 2 to the outside of the housing 2, the axial fan 3 fixed to the fixed part 201a, various members for fixing the axial fan 3 to the fixed part 201a (for example, the fixing screws 50, the nuts 51, and the vibration-proof washers 52), and the adhesive tapes 60 are detached from the housing 2. This makes it easy for a user to replace the adhesive tapes 60 or the axial fan 3, for example.

[0127] The lighting device 1 includes a latch mechanism 70 that holds the fixed part 201a in a state where it covers the opening 201b. The latch mechanism 70 can also be said to be a mechanism for fixing the fixed part 201a to the housing 2. The latch mechanism 70 has an operation unit that is operated by a user's hand. The user can attach or detach the fixed part 201a by operating the operation unit of the latch mechanism 70.

[0128] The operating portion of the latch mechanism 70 may be a doorknob type, a push button type, a rotation type, a removable type, a lever type, or a wing nut or a knurled screw.

[0129] The latch mechanism 70 may be a magnet type that fixes the fixed portion 201a to the housing 2. The latch mechanism 70 may also include a clamp or a link mechanism. The latch mechanism 70 may also be a door fastener or a door catcher.

[0130] A tool may be used when the fixed part 201a is removed from the housing 2. In this case, for example, the fixed part 201a may be screwed to the housing 2. When the fixed part 201a is screwed to the housing 2, the user removes the fixed part 201a from the housing 2 after removing the screw from the housing 2 using, for example, a screwdriver tool as a tool. The fixed part 201a may also be fixed to the housing 2 using, for example, a lock. In this case, the user removes the fixed part 201a from the housing 2 after opening the lock using a key as a tool.

[0131] The fixed part 201a may be openable and closable to the outside of the housing 2. In this case, after the fixed part 201a is opened to the outside of the housing 2, a user can, for example, replace the adhesive tape 60 or replace the axial fan 3. For example, a hinge may be used to open and close the fixed part 201a.

[0132] Even if the fixed part 201a can be opened and closed to the outside of the housing 2, the lighting device 1 may include a latch mechanism 70 that holds the fixed part 201a in a state in which it covers the opening 201b. In this case, the latch mechanism 70 can be said to be a mechanism that holds the fixed part 201a in a closed state.

[0133] Also, a tool may be used when the fixed part 201a is opened to the outside of the housing 2. For example, if the fixed part 201a is screwed to the housing 2 after being closed, the user may use a driver tool to remove the screw from the housing 2 and then open the fixed part 201a. Also, if the closed state of the fixed part 201a is maintained by using a lock, the user may use a key to open the lock and then open the fixed part 201a.

[0134] <Other examples> The lighting device 1 may include a vibration-proof material 90 sandwiched between the housing 2 and the fan casing 30. The vibration-proof material 90 may include, for example, a plurality of vibration-proof washers 91 sandwiched between the housing 2 and the fan casing 30, as shown in Fig. 17. A plurality of fixing screws 50 are passed through the plurality of vibration-proof washers 91, respectively. Only a front wall portion 201 of the housing 2 is shown in Fig. 17.

[0135] Each anti-vibration washer 91 is sandwiched between the front wall portion 201 and the fan casing 30 so as to be in contact with the front wall portion 201 and the fan casing 30. The anti-vibration washer 91 may be made of, for example, the same material as the anti-vibration washer 52 described above.

[0136] In this way, when the lighting device 1 includes the vibration-proof material 90 sandwiched between the housing 2 and the fan casing 30, vibrations generated in the fan casing 30 when the impeller 32 rotates are less likely to be transmitted to the housing 2.

[0137] 17, gaps 110 are generated between the housing 2 and the fan casing 30 in the axial direction. Specifically, gaps 110 are generated between the front wall portion 201 and the four corners of the fan casing 30 in the axial direction. The axial gaps between the front wall portion 201 and the fan casing 30 can be said to be gaps around the fan intake port 300.

[0138] In this way, when a gap 110 exists between the housing 2 and the fan casing 30 in the axial direction, the seal member 6 may close the gap 110. Figure 18 is a schematic diagram showing an example of how the seal member 6 closes the gap 110.

[0139] 18, one adhesive tape 60 is attached across the inner surface of the front wall portion 201 and the peripheral side surface of the fan casing 30 so as to surround the peripheral side surface of the fan casing 30. This closes the axial gap 110 between the front wall portion 201 and the fan casing 30. In the example of Fig. 18, one adhesive tape 60 is attached across the inner surface of the front wall portion 201 and the peripheral side surface of the fan casing 30 so as to close a plurality of opening regions 125.

[0140] Note that a plurality of adhesive tapes 60 may be attached across the inner surface of front wall portion 201 and the peripheral side surface of fan casing 30 so as to surround the peripheral side surface of fan casing 30 .

[0141] In this way, when the seal member 6 closes the axial gap 110 between the housing 2 and the fan casing 30, it is possible to prevent the air taken into the housing 2 by the axial fan 3 from flowing to the outside of the fan casing 30 through the gap 110 without passing through the fan intake port 300. This makes it easier for the air outside the housing 2 to be taken into the casing 30 from the fan intake port 300. As a result, the amount of air discharged from the fan exhaust port 310 increases, improving the cooling effect on the light emitting device 4.

[0142] In addition, even if there is no axial gap 110 between the housing 2 and the fan casing 30, as in the example of Figure 5, at least one adhesive tape 60 may be attached across the inner surface of the front wall portion 201 and the peripheral side surface of the fan casing 30 from the inside of the housing 2 so as to surround the peripheral side surface of the fan casing 30 while blocking the multiple opening areas 125.

[0143] The vibration-proof material 90 may include a vibration-proof sheet 95 sandwiched between the housing 2 and the fan casing 30, instead of the vibration-proof washer 91. This makes it difficult for vibrations generated in the fan casing 30 when the impeller 32 rotates to be transmitted to the housing 2, similar to the case where the vibration-proof material 90 includes the vibration-proof washer 91.

[0144] Fig. 19 is a schematic diagram showing an example of a state in which an anti-vibration sheet 95 is added to the structure shown in Fig. 8 described above. Fig. 20 is a schematic diagram showing an example of an axial fan 3 and anti-vibration sheet 95 of a lighting device 1 having the structure shown in Fig. 19, viewed in the axial direction from the front side. Fig. 21 is a schematic diagram showing an example of a front wall portion 201 and anti-vibration sheet 95 of a lighting device 1 having the structure shown in Fig. 19, viewed in the axial direction from the rear side. Fig. 22 is a schematic diagram showing an example of the anti-vibration sheet 95.

[0145] The vibration-proof sheet 95 is sandwiched between the front wall portion 201 of the housing 2 and the fan casing 30. Specifically, the vibration-proof sheet 95 is sandwiched between the fixed portion 201a of the front wall portion 201 and the intake side surface of the fan casing 30. The vibration-proof sheet 95 is, for example, sandwiched between the fixed portion 201a and the fan casing 30. The vibration-proof sheet 95 may be made of, for example, the same material as the vibration-proof washer 52. The outer shape of the vibration-proof sheet 95 when viewed from the thickness direction of the vibration-proof sheet 95 is, for example, rectangular.

[0146] The vibration-proof sheet 95 has, for example, an air vent 96 through which air taken into the housing 2 passes. The air vent 96 faces the housing air inlet 20 on the front side and faces the fan air inlet 300 on the rear side. The housing air inlet 20, the air vent 96, the fan air inlet 300, and the fan exhaust port 310 are lined up in this order along the axial direction from the front side to the rear side. The air that has passed through the housing air inlet 20 passes through the air vent 96 and the fan air inlet 300 in this order, and is then discharged from the fan exhaust port 310 to the outside of the fan casing 30.

[0147] 21 , the size and shape of the vent 96 match, for example, the size and shape of the opening at the rear end of the housing air inlet 20. When the housing air inlet 20 and the vent 96 are viewed in the axial direction from the rear side, the vent 96 overlaps with the opening at the rear end of the housing air inlet 20.

[0148] 20 , when the ventilation hole 96 and the fan intake port 300 are viewed from the axial direction, an edge 960 of the ventilation hole 96 is located outside an edge 301 of the fan intake port 300. Also, when the ventilation hole 96 and the fan exhaust port 310 are viewed from the axial direction, an edge 960 of the ventilation hole 96 is located outside an edge 311 of the fan exhaust port 310.

[0149] 20, when the ventilation hole 96 is viewed in the axial direction, the ventilation hole 96 has an opening region 965 located outside the outer edge 30a of the casing 30. For example, the ventilation hole 96 has a plurality of opening regions 965. For example, the plurality of opening regions 965 overlap with the plurality of opening regions 125 of the housing intake port 20 in the axial direction. In other words, the plurality of opening regions 965 are connected to the plurality of opening regions 125, respectively.

[0150] The adhesive tapes 60 of the sealing member 6 respectively close the opening regions 965. The adhesive tapes 60 are attached across the rear surface of the vibration-proof sheet 98 and the peripheral side surface of the fan casing 30 so as to close the entire opening region 965 from the inside of the housing 2.

[0151] Here, one opening region 125 and one opening region 965 that are connected to each other are collectively referred to as a connected opening region. The multiple connected opening regions (four connected opening regions in this example) are located around the fan intake port 300 in a plan view from the front side. The multiple connected opening regions can be said to be gaps around the fan intake port 300. The multiple connected opening regions can be said to be gaps around the fan intake port 300 that are located within the housing intake port 20 when the housing 2 is viewed in the axial direction from the housing intake port 20 side. The multiple connected opening regions can also be said to be gaps between the fan casing 30 and a member consisting of the housing 2 and the vibration-proof sheet 95 that is located on the intake side of the fan casing 30 relative to the fan casing 30.

[0152] The seal member 6 closes a plurality of connected opening areas as gaps around the fan intake port 300. The plurality of adhesive tapes 60 close the plurality of opening areas 965 from inside the housing 2, thereby closing the plurality of connected opening areas from inside the housing 2. By closing the plurality of connected opening areas, it is possible to prevent air from the outside of the housing 2 from passing through the connected opening area around the fan intake port 300. This makes it easier for air outside the housing 2 to be taken into the casing 30 from the fan intake port 300. As a result, the amount of air discharged from the fan exhaust port 310 increases.

[0153] As in the example of FIG. 16 described above, adhesive tape 60 may close opening area 125 from the outside of housing 2, thereby closing the connecting opening area around fan intake port 300.

[0154] Also, similar to the example of Figure 18, at least one adhesive tape 60 may be attached across the rear surface of the vibration-proof sheet 95 and the peripheral side surface of the fan casing 30 so as to surround the peripheral side surface of the fan casing 30, thereby blocking multiple connecting opening areas.

[0155] 20 to 22, the vibration-proof sheet 95 has a plurality of through holes 97 through which a plurality of fixing screws 50 are respectively passed. The vibration-proof sheet 95 has, for example, four through holes 97 according to the number of the fixing screws 50. The through hole 85 of the front portion 100, the through hole 97 of the vibration-proof sheet 95, and the through hole 315 of the fan casing 30 through which one fixing screw 50 is passed are aligned in this order from the front side to the rear side along the axial direction. The fixing screw 50 is passed from the outside of the housing 2 through the through hole 85, the through hole 97, and the through hole 315 in this order.

[0156] Here, when the anti-vibration sheet 95 and the axial fan 3 are viewed from the front, a portion of each through hole 315 provided in the fan casing 30 is located inside the ventilation opening 96, as shown in Fig. 20. Therefore, the outer shape of each through hole 97 of the anti-vibration sheet 95 (specifically, the outer shape viewed from the axial direction) is not circular but is an arc. The central angle of the arc formed by the outer shape of the through hole 97 may be greater than 180 degrees. In this case, the fixing screw 50 passed through the through hole 97 is less likely to come out of the through hole 97.

[0157] It should be noted that since the vibration-proof sheet 95 is sandwiched between the housing 2 and the fan casing 30, the vibration-proof sheet 95 does not need to be provided with through holes 97. If the vibration-proof sheet 95 has through holes 97, the position of the vibration-proof sheet 95 is less likely to shift.

[0158] An edge 960 of the ventilation hole 96 of the vibration-proof sheet 95 may have a portion located inside the edge 21 of the housing air inlet 20. In this case, the outer shape of the through hole 97 may be a circle instead of an arc. Also, in this case, the vibration-proof sheet 95 may cover a plurality of opening regions 125. FIG. 23 is a schematic diagram showing an example of a vibration-proof sheet 95 that covers a plurality of opening regions 125. FIG. 23 shows an example of the axial fan 3 and the vibration-proof sheet 95 viewed from the front in the axial direction, similar to FIG. 20.

[0159] In the example of FIG. 23, when the ventilation hole 96 and the fan intake port 300 of the vibration-proof sheet 95 are viewed from the front side in the axial direction, the entire area of ​​the edge 960 of the ventilation hole 96 is located inside the entire area of ​​the outer edge 30a of the fan casing 30. Therefore, the ventilation hole 96 does not have an opening area 965 located outside the outer edge 30a of the casing 30. When the structure shown in FIG. 23 is attached to the front wall portion 201 of the housing 2, as shown in FIG. 24, the vibration-proof sheet 95 blocks the multiple opening areas 125 of the housing intake port 20 from the inside of the housing 2 in a plan view from the front side. In this case, the vibration-proof sheet 95 can be considered to be included in the seal member 6 that blocks the gap around the fan casing 30. The vibration-proof sheet 95 may block only a part of the multiple opening areas 125.

[0160] In the example of FIG. 18, the adhesive tape 60 included in the sealing member 6 closes the gap 110 in the axial direction, but the method by which the sealing member 6 closes the gap 110 in the axial direction is not limited to this. For example, as shown in FIG. 25, the sealing member 6 may include a sheet 65 sandwiched between the housing 2 and the fan casing 30 so as to fill the gap 110. The sheet 65 is made of an air-impermeable material. For example, the thickness of the sheet 65 is set to be larger than the axial size of the gap 110. As a result, the sheet 65 is sandwiched between the front wall portion 201 and the fan casing 30.

[0161] The sheet 65 may have, for example, the same shape as the vibration-proof sheet 95. In this case, the vibration-proof washer 91 may be disposed inside a hole provided in the sheet 65 and corresponding to the through hole 97. The sheet 65 may also be made of the same material as the vibration-proof sheet 95. In this case, since the sheet 65 functions as a vibration-proof sheet, the sheet 65 may be considered to be included in the vibration-proof material 90 sandwiched between the housing 2 and the fan casing 30.

[0162] The lighting device 1 may include an air filter 150 having a portion facing the housing air inlet 20. In this case, dust is less likely to enter the axial fan 3 and the light emitting device 4 side than the air filter 150. FIG. 26 is a schematic diagram showing an example of the air filter 150.

[0163] Air filter 150 is sandwiched between front wall portion 201 of housing 2 and fan casing 30. Figure 26 shows an example of the air filter 150 and front wall portion 201 as viewed from the rear side.

[0164] Air filter 150 has a facing portion 151 that faces housing air intake port 20 in the axial direction. Air filter 150 also has through holes 152 through which the multiple fixing screws 50 are respectively passed. Air filter 150 has, for example, four through holes 152 according to the number of fixing screws 50.

[0165] The air filter 150 may be, for example, a nonwoven fabric filter or an electrostatic filter. The air filter 150 may be attached to the inner surface of the front wall portion 201, or may be sandwiched between the front wall portion 201 and the fan casing 30. The air filter 150 may also be fixed to the front wall portion 201 with screws or the like.

[0166] The air filter 150 may be attached to the outer surface (in other words, the front surface) of the front wall portion 201. In addition, in a case where the lighting device 1 includes the vibration-proof sheet 95, the air filter 150 may be disposed between the front wall portion 201 and the vibration-proof sheet 95, or may be disposed between the vibration-proof sheet 95 and the fan casing 30.

[0167] In the above example, the vibration-isolating washer 52 is used as the vibration-isolating material that contacts the casing 30 and the fixing screw 50, but the vibration-isolating material is not limited to this. For example, as shown in Fig. 27, the lighting device 1 may include a vibration-isolating material 160 that contacts not only the casing 30 and the fixing screw 50 but also the heat dissipation member 48 of the light-emitting device 4.

[0168] In the example of FIG. 27, the lighting device 1 includes a plurality of vibration-proof materials 160 through which a plurality of fixing screws 50 are respectively passed. The vibration-proof materials 160 are, for example, cylindrical members. The vibration-proof materials 160 can also be said to be hollow columnar members. The vibration-proof materials 160 may be made of, for example, the same material as the vibration-proof washers 52. The vibration-proof materials 160 have through holes through which the fixing screws 50 are passed. The through holes of the vibration-proof materials 160 may be screw holes into which the fixing screws 50 are screwed. The plurality of vibration-proof materials 160 are sandwiched between the fan casing 30 and the fixing parts 481 of the heat dissipation member 48.

[0169] 27, a plurality of through holes through which a plurality of fixing screws are passed are provided in fixing portion 481 of heat dissipation member 48. The through holes of fixing portion 481 may be threaded holes into which fixing screws 50 are screwed.

[0170] 27, the fixing screw 50 is passed through the through hole 85 of the front portion 100, the through hole 315 of the fan casing 30, the through hole of the vibration-proof material 160, and the through hole of the fixing portion 481 of the heat dissipation member 48, in that order, from the outside of the housing 2. Then, the nut 50 is attached to the portion of the fixing screw 50 that protrudes from the rear surface of the fixing portion 481. As a result, the vibration-proof material 160 comes into contact with the fan casing 30, the fixing screw 50, and the heat dissipation member 48. In the example of FIG. 27 as well, it becomes difficult for vibration of the fan casing 30 to be transmitted to the housing 2 through the fixing screw 50.

[0171] Although the lighting device has been described in detail as above, the above description is merely illustrative in all respects, and this disclosure is not limited thereto. In addition, the above-described various examples can be combined and applied as long as they are not mutually inconsistent. It is understood that countless examples not illustrated can be envisioned without departing from the scope of this disclosure.

[0172] This disclosure includes the following:

[0173] In one embodiment, (1) an illumination device includes a housing having a housing inlet, a light-emitting device located within the housing and emitting illumination light to the outside of the housing, an axial fan located inside the housing and taking in air from the outside of the housing into the housing through the housing inlet and including a casing having a fan inlet, and a sealing member, wherein when the housing inlet and the fan inlet are viewed from the axial direction of the axial fan, an edge of the housing inlet is located outside the edge of the fan inlet, and the sealing member seals the gap around the fan inlet.

[0174] (2) In the lighting device described above in (1), the sealing member seals a gap around the fan intake port that is located within the housing intake port when the housing is viewed in the axial direction from the housing intake port side.

[0175] (3) In the lighting device according to (1) or (2) above, the seal member closes the axial gap between the housing and the casing.

[0176] (4) The lighting device according to (1) or (2) above further comprises a first vibration-isolating material sandwiched between the housing and the casing.

[0177] (5) In the lighting device described above in (4), the first vibration-proof material is a vibration-proof sheet.

[0178] (6) In the lighting device according to any one of (1) to (3) above, the sealing member has a sheet sandwiched between the housing and the casing.

[0179] (7) In the lighting device described above in (6), the sheet is an anti-vibration sheet.

[0180] (8) In the lighting device according to any one of (1) to (7) above, the sealing member has an adhesive tape.

[0181] (9) In the lighting device of (2) above, the sealing member has an adhesive tape that seals a gap around the casing that is located inside the housing air inlet when the housing is viewed in the axial direction from the housing air inlet side, and the adhesive surface of the adhesive tape has an exposed area that is exposed to the outside of the lighting device.

[0182] (10) The lighting device according to any one of (1) to (9) above, further comprising an air filter having a portion facing the housing air intake port.

[0183] (11) In the lighting device according to any one of (1) to (10) above, an inner circumferential surface of the housing air intake has an inclined surface that inclines from the inside of the housing to the outside of the housing toward the outside of the housing.

[0184] (12) Any one of the lighting devices described above in (1) to (11) includes a partition portion that divides the housing air intake into a plurality of opening areas when the housing air intake is viewed in the axial direction from outside the housing.

[0185] (13) In the lighting device of (12) above, the partition portion has an opposing portion that faces a boss of an impeller of the axial fan, and a plurality of ribs that extend from the opposing portion toward the edge of the housing air intake when the partition portion is viewed in the axial direction from outside the lighting device.

[0186] (14) In the lighting device according to (13) above, the plurality of ribs include a rib provided with at least a part of a through hole through which a fixing screw for fixing the axial fan to the housing passes.

[0187] (15) Any one of the lighting devices described above in (12) to (14), wherein the plurality of opening areas includes a first opening area, the partition portion has an edge portion that defines the first opening area when the partition portion is viewed in the axial direction from outside the lighting device, and the edge portion has an inclined surface that slopes outwardly from the rear side to the front side when the partition portion is viewed in the axial direction from outside the lighting device.

[0188] (16) In any one of the lighting devices described above in (1) to (15), the housing has a fixed portion to which the axial fan is fixed, and the fixed portion is detachable or can be opened and closed to the outside of the housing.

[0189] (17) In any one of the lighting devices (1) to (16) above, the light emitting device has a laser light source and a wavelength converting unit that emits fluorescence having a wavelength spectrum different from that of the laser light in response to irradiation with laser light emitted by the laser light source.

[0190] (18) In the illumination device according to (17) above, the laser light source and the wavelength conversion section are aligned in a direction of an optical axis of the laser light source.

[0191] (19) In the lighting device according to (17) above, the laser light is reflected by a reflecting member and irradiated onto the wavelength conversion section.

[0192] (20) In any one of the lighting devices described above in (17) to (19), the light-emitting device has a heat dissipation member that dissipates heat generated by the laser light source, and the air exhausted from the axial fan directly hits the heat dissipation member.

[0193] (21) In the lighting device according to any one of (17) to (20) above, the housing has a heat dissipation structure that dissipates heat generated by the wavelength conversion section.

[0194] (22) The lighting device according to any one of (1) to (21) above, further comprising a fixing screw for fixing the axial fan to the housing, and a second vibration-isolating material in contact with the fixing screw and the casing.

[0195] (23) In the lighting device of (22) above, the light emitting device has a heat dissipation member, and the second vibration isolating material is in contact with the heat dissipation member. [Explanation of symbols]

[0196] 1 Lighting equipment 2. Chassis 3 Axial Fan 6 Sealing material 20 Chassis air intake 21 Inner surface (edge) 30 Casing 4. Light-emitting device 41 Laser light source 42 Wavelength conversion section 48 Heat dissipation material 50 Fixing screw 52 Anti-vibration washer 60 Adhesive Tape 60a adhesive surface 65 seats 80 Partition 81 Opposite part 82 Ribs 90,160 Vibration isolating material 91 Anti-vibration washer 95 Anti-vibration sheet 110 Gap 125 Opening area 180 Edge 201a Fixed part 210 Heat dissipation structure 300 Fan Intake 301 Relationship L1 illumination light L2 Laser light L3 fluorescence

Claims

1. a housing having a housing intake port; a light emitting device located within the housing and configured to emit illumination light to the outside of the housing; an axial flow fan located inside the housing, taking in air from outside the housing into the housing through the housing air inlet, the axial flow fan including a casing having a fan air inlet; Seal material Equipped with when the housing air inlet and the fan air inlet are viewed from an axial direction of the axial flow fan, an edge of the housing air inlet is located outside an edge of the fan air inlet, The sealing member seals a gap around the fan intake port.

2. 2. The lighting device according to claim 1, The sealing member closes a gap around the fan intake port located within the housing intake port when the housing is viewed in the axial direction from the housing intake port side.

3. 3. The lighting device according to claim 1, The sealing member closes the axial gap between the housing and the casing.

4. 3. The lighting device according to claim 1, A lighting device comprising a first vibration-isolating material sandwiched between the housing and the casing.

5. 5. The lighting device according to claim 4, A lighting device, wherein the first vibration-isolating material is a vibration-isolating sheet.

6. 3. The lighting device according to claim 1, The sealing member has a sheet sandwiched between the housing and the casing.

7. 7. The lighting device according to claim 6, A lighting device, wherein the sheet is an anti-vibration sheet.

8. 3. The lighting device according to claim 1, The sealing member includes an adhesive tape.

9. 3. The lighting device according to claim 2, the sealing member has an adhesive tape that closes a gap around the casing, the gap being located inside the housing air intake port when the housing is viewed in the axial direction from the housing air intake port side, An illumination device, wherein the adhesive surface of the adhesive tape has an exposed area that is exposed to an outside of the illumination device.

10. 3. The lighting device according to claim 1, A lighting device comprising an air filter having a portion facing the housing air inlet.

11. 3. The lighting device according to claim 1, An illumination device, wherein an inner circumferential surface of the housing air intake has an inclined surface that inclines outward from the housing air intake from the inside of the housing to the outside of the housing.

12. 3. The lighting device according to claim 1, A lighting device comprising: a partition portion that divides the housing air intake into a plurality of opening regions when the housing air intake is viewed in the axial direction from outside the housing.

13. 13. The lighting device according to claim 12, The partition portion is an opposing portion that faces a boss of an impeller of the axial flow fan; a plurality of ribs extending from the opposing portion toward an edge side of the housing air intake port when the partition portion is viewed in the axial direction from outside the lighting device; A lighting device comprising:

14. 14. The lighting device according to claim 13, A lighting device, wherein the plurality of ribs include a rib having at least a portion of a through hole through which a fixing screw for fixing the axial fan to the housing passes.

15. 13. The lighting device according to claim 12, the plurality of opening regions includes a first opening region; the partition portion has an edge portion that defines the first opening region when the partition portion is viewed in the axial direction from outside the lighting device, The edge portion has an inclined surface that inclines toward the outside of the first opening region from the rear side to the front side when the partition portion is viewed in the axial direction from outside the lighting device.

16. 3. The lighting device according to claim 1, the housing has a fixed portion to which the axial flow fan is fixed, A lighting device, wherein the fixed portion is detachable or openable to the outside of the housing.

17. 3. The lighting device according to claim 1, The light emitting device comprises: A laser light source; a wavelength conversion unit that emits fluorescence having a wavelength spectrum different from that of the laser light in response to irradiation of the laser light emitted by the laser light source; A lighting device comprising:

18. 18. The lighting device according to claim 17, The laser light source and the wavelength conversion unit are aligned in an optical axis direction of the laser light source.

19. 18. The lighting device according to claim 17, The laser light is reflected by a reflecting member and irradiated onto the wavelength converting unit.

20. 18. The lighting device according to claim 17, the light emitting device has a heat dissipation member that dissipates heat generated by the laser light source, The air exhausted from the axial fan directly hits the heat dissipation member.

21. 18. The lighting device according to claim 17, The housing has a heat dissipation structure that dissipates heat generated by the wavelength conversion unit.

22. 3. The lighting device according to claim 1, a fixing screw for fixing the axial flow fan to the housing; a second vibration isolating material in contact with the fixing screw and the casing; A lighting device comprising:

23. 23. The lighting device according to claim 22, the light emitting device has a heat dissipation member, The second vibration-isolating material is in contact with the heat dissipation member.

Images