Lighting apparatus

Abstract

To provide a lighting fixture with improved reliability.SOLUTION: A lighting fixture 10 includes a light-emitting device 100 having a light source part 120 for emitting light forward, a lens barrel 200, a first radiator 70, an air blower 170, and a housing 20. Lens barrel 200 is disposed in front of light-emitting apparatus 100, and holds one or more lenses 260. The first heat radiator 70 forms a flow path of gas flowing in the front-rear direction. The air blower 170 is disposed behind the light emitting device 100 and generates a flow of gas. Housing 20 houses light-emitting device 100, lens barrel 200, and first heat dissipator 70. When viewed from the front, first heat dissipator 70 is disposed between (I) lens barrel 200 and light-emitting device 100 and (ii) inner peripheral surface 23 of case 20.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] Patent Document 1 discloses an LED lamp. This LED lamp includes an LED module with an LED and a substrate, a heat sink having a plate-shaped heat sink main body with the LED module attached to its upper surface, and a cooling fan disposed on the underside of the heat sink main body. The upper surface of the heat sink main body is covered with a translucent cover, and at least the fins of the heat sink and the fan are housed in a case. The heat sink is provided with a plurality of plate-shaped fins that are spaced apart from each other and extend radially from the center of the heat sink main body toward the outer periphery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-26865 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional LED lamp described above, at least a portion of the gas flow generated by the rotation of the fan is guided by the fins. The gas guided by the fins collides with the underside of the heat sink body and the fins, travels from the center of the heat sink body toward its outer edge, and is then discharged toward the outer surface of the cover through the gap between the peripheral wall of the heat sink and the case. As the discharged gas passes through the heat sink, it changes its direction and speed while exchanging heat through collisions with the heat sink body and the fins. This makes it prone to uneven flow speeds as it exits the LED lamp. If uneven flow speeds of heated gas occur in the area where the LED lamp emits light, fluctuations in the light emitted from the LED lamp may occur.

[0005] The present invention was made by the inventors of the present application with a new focus on the above-mentioned problem, and has an object to provide a lighting device that can suppress fluctuations in illumination light. [Means for solving the problem]

[0006] A lighting fixture according to one aspect of the present invention comprises a light-emitting device having a light source unit that emits light forward, a lens barrel that holds one or more lenses and is arranged in front of the light-emitting device, a first heat dissipation body that forms a flow path for gas flowing in the front-to-back direction, a blower that is arranged behind the light-emitting device and generates the gas flow, and a housing that houses the light-emitting device, the lens barrel, and the first heat dissipation body, and when viewed from the front, the first heat dissipation body is arranged between the lens barrel and the light source unit and the inner surface of the housing. [Effects of the Invention]

[0007] According to the lighting fixture of the present invention, fluctuation of illumination light can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the outline of the configuration of a lighting fixture according to an embodiment. [Figure 2] FIG. 2 is a first exploded perspective view of the lighting fixture according to the embodiment. [Figure 3] FIG. 3 is a second exploded perspective view of the lighting fixture according to the embodiment. [Figure 4] FIG. 4 is a schematic plan view of a light source unit according to the embodiment. [Figure 5] FIG. 5 is a front view showing the configuration of the first heat dissipator and its surroundings according to the embodiment. [Figure 6] FIG. 6 is a partially enlarged view showing a specific example of the configuration of the first heat dissipating body according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing the outline of the configuration of a lighting fixture according to an embodiment. [Figure 8]FIG. 8 is a cross-sectional view showing a state in which the blower according to the embodiment blows out gas from the front to the rear. [Figure 9] FIG. 9 is a schematic diagram showing a state in which a lighting fixture according to an embodiment is placed on a ceiling. [Figure 10] FIG. 10 is a cross-sectional view showing the outline of the configuration of a lighting fixture according to a modified example of the embodiment. [Figure 11] FIG. 11 is an exploded perspective view showing an outline of the configuration of a partition member and a sound absorbing material according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Below, lighting fixtures according to embodiments of the present invention (including variations thereof) will be described in detail with reference to the drawings. Each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements, and connection forms shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not recited in the independent claims will be described as optional components.

[0010] Each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially identical components are assigned the same reference numerals, and redundant explanations are omitted or simplified. The position of the lighting device when in use is not limited to the position shown in each figure, and can be determined appropriately depending on the purpose or use, etc.

[0011] In this specification, terms indicating the relationship between elements, terms indicating the shape of elements such as circle, and numerical ranges are not expressions that express only the strict meaning, but are expressions that mean that a substantially equivalent range, for example, a difference of about a few percent, is also included.

[0012] [1. General description of lighting fixture 10] First, the overall configuration of lighting fixture 10 according to the present embodiment will be described with reference to Figures 1 to 4. Figure 1 is a perspective view showing an outline of the configuration of lighting fixture 10 according to the embodiment. Figure 2 is a first exploded perspective view of lighting fixture 10 according to the embodiment. Figure 2 shows an exploded perspective view of lighting fixture 10 as seen obliquely from the front. Figure 3 is a second exploded perspective view of lighting fixture 10 according to the embodiment. Figure 3 shows an exploded perspective view of lighting fixture 10 as seen obliquely from the rear. Figure 4 is a schematic plan view of light source unit 120 according to the embodiment.

[0013] 1, the lighting fixture 10 is, for example, a spotlight, and is attached to a ceiling or wall by a predetermined means. The lighting fixture 10 may also be a downlight or a ceiling light.

[0014] As shown in FIGS. 1 to 3, lighting fixture 10 includes light-emitting device 100, first heat sink 70, lens barrel 200, blower 170, and housing 20. Housing 20 includes cylindrical housing main body 21, front cover 90 disposed forward of lens barrel 200, and rear cover 40 disposed at the rear end of housing main body 21. Light-emitting device 100 includes light source unit 120 that emits light forward and light source substrate 110 on which light source unit 120 is disposed. In this embodiment, the positive direction of the Y-axis is regarded as the main direction of light emission from light source unit 120 (i.e., forward). That is, in this embodiment, optical axis L1 (see FIG. 2) of light source unit 120 is parallel to the Y-axis direction. Electric wires (not shown) that supply power for light emission by light source unit 120 and / or control signals for controlling light source unit 120 are connected to light source substrate 110.

[0015] In this embodiment, the light source unit 120 is a light source that emits white light. As shown in FIG. 4, the light source unit 120 includes, for example, a plurality of light-emitting elements 121 arranged in a two-dimensional matrix. The plurality of light-emitting elements 121 are regularly arranged in a matrix of M rows and N columns. M and N are natural numbers of 2 or more. M and N may be the same value or different values. The arrangement intervals of the light-emitting elements 121 in the row direction and the column direction may be the same or different. The outer shape of the area in which the plurality of light-emitting elements 121 are arranged is rectangular, but may also be circular.

[0016] The plurality of light-emitting elements 121 include, for example, blue light-emitting elements and yellow phosphors. The yellow phosphors are disposed on the light-emitting side (front) of the blue light-emitting elements. The blue light-emitting elements are, for example, LEDs (Light Emitting Diodes). The blue light-emitting elements are, for example, minute LEDs measuring 100 μm×100 μm or less. The yellow phosphors are phosphors that are excited by blue light to emit yellow light. The white light emitted from the light-emitting elements 121 is a mixture of the yellow light and the blue light that has passed through the yellow phosphors. The yellow phosphors are, for example, YAG (yttrium aluminum garnet) phosphors, but are not limited to this.

[0017] The yellow phosphor may be provided so as to cover the plurality of blue light-emitting elements. For example, a yellow fluorescent plate may be disposed so as to entirely cover the plurality of blue light-emitting elements arranged in a two-dimensional matrix.

[0018] Although not shown in the figure, for example, the light source substrate 110 is provided with a control unit that controls the light emission of the multiple light-emitting elements 121. The control unit independently controls each of the multiple light-emitting elements 121. That is, the control unit can individually control the on / off, light-emitting intensity, light-emitting time, etc. of each of the multiple light-emitting elements 121. For example, by individually controlling the on / off of the multiple light-emitting elements 121, the lighting fixture 10 can emit illumination light with varying brightness in each region. That is, by irradiating the illumination light onto, for example, a wall surface, an image corresponding to the brightness can be formed on the wall surface.

[0019] It is not essential that the light source unit 120 includes multiple light-emitting elements 121. The light source unit 120 may include one or more light-emitting elements 121 depending on the specifications required of the lighting fixture 10, etc. The multiple light-emitting elements 121 may include two or more light-emitting elements 121 that emit light of different colors. In this case, the two or more light-emitting elements 121 may be individually controlled to change the color of light emitted by the light source unit 120. When the light source unit 120 includes multiple light-emitting elements 121, it is not necessary to individually control each of the multiple light-emitting elements 121. The multiple light-emitting elements 121 may be synchronously controlled to be turned on and off collectively, etc.

[0020] In this embodiment, light emitting device 100 is housed in a cylindrical holding member 300 together with lens barrel 200 arranged in front of light emitting device 100. The internal structure of holding member 300 will be described later with reference to FIG.

[0021] The first heat dissipation body 70 is disposed along the outer periphery of the holding member 300 that holds the light emitting device 100 and the lens barrel 200. In other words, the first heat dissipation body 70 is disposed between the holding member 300 and the inner circumferential surface 23 of the housing 20. The first heat dissipation body 70 is a member for dissipating heat from the light source substrate 110 to the outside. The first heat dissipation body 70 includes an annular inner circumferential portion 71 and a plurality of first fins 72 extending radially from the inner circumferential portion 71. The plurality of first fins 72 form a gas flow path in the front-rear direction. In other words, at least a portion of the heat generated by the light emitting device 100 is conducted to the first heat dissipation body 70 via the holding member 300. The first heat dissipation body 70 that receives heat from the holding member 300 is cooled by heat exchange with the gas flowing in the front-rear direction along the plurality of first fins 72. That is, gas flowing in the front-rear direction along the multiple first fins 72 is heated by the first heat dissipator 70 (i.e., absorbs heat from the first heat dissipator 70) and is discharged to the outside of the housing 20. The gas that has received heat from the first heat dissipator 70 is discharged forward through one or more first ventilation holes 91. Specifically, the front cover 90 disposed in front of the first heat dissipator 70 includes an illumination opening 95 provided in the center and one or more first ventilation holes 91 disposed around the illumination opening 95, as shown in FIGS. 1 to 3 . More specifically, in the front cover 90 according to the present embodiment, the multiple first ventilation holes 91 are arranged in a ring shape surrounding the illumination opening 95 so as to face the ring-shaped first heat dissipator 70. Details of the first heat dissipator 70 and the surrounding configuration will be described later with reference to FIGS. 5 to 7 .

[0022] Lens barrel 200 is an optical component including one or more lenses 260. In the present embodiment, lens barrel 200 applies a predetermined optical effect to light emitted from light-emitting device 100 and emits the light forward so that an image based on the illumination light is formed on a wall surface located in front of the lens barrel 200. Specifically, the illumination light emitted from lens barrel 200 passes through an illumination opening 95 in front cover 90 and is emitted forward. In the present embodiment, illumination opening 95 is provided in front cover 90 as an open through-hole, but illumination opening 95 may also be covered with a translucent cover (such as a resin plate or glass plate). This prevents external foreign objects or a person's fingertip from coming into contact with the frontmost lens 260 (fourth lens 264 in the present embodiment) of lens barrel 200.

[0023] 2 and 3, the lens barrel 200 includes a barrel body 210 and one or more lenses 260 fixed to the barrel body 210. In FIGS. 2 and 3, a fourth lens 264, which is the frontmost lens 260, and a first lens 261, which is the lens 260 closest to the light emitting device 100, are shown.

[0024] Lens barrel 200 may be movable in the front-rear direction relative to light emitting device 100 (its position in the front-rear direction may be adjustable). For example, holding member 300 may include a support portion (not shown) that movably supports lens barrel 200. This allows the position of lens barrel 200 to be adjusted according to the distance between lighting device 10 and a wall surface onto which the illumination light is irradiated, so that an image based on the illumination light is formed on the wall surface. In other words, lens barrel 200 may be capable of adjusting the focus of an image based on the illumination light.

[0025] The second heat dissipation body 80 is a member for dissipating heat from the light source substrate 110 to the outside. The second heat dissipation body 80 is arranged behind the light emitting device 100 so as to be thermally connected to the light source substrate 110. Specifically, the light source substrate 110 is fixed to the front surface of a substrate fixing portion 320 (see FIG. 3 ) of the holding member 300, and the second heat dissipation body 80 is fixed to the rear surface of the substrate fixing portion 320. As a result, at least a portion of the heat generated by the light emitting device 100 is conducted to the second heat dissipation body 80 via the substrate fixing portion 320.

[0026] More specifically, the second heat dissipation body 80 includes a heat dissipation main body portion 81 fixed to the rear surface of the substrate fixing portion 320, and a plurality of second fins 82 extending rearward from the heat dissipation main body portion 81. As shown in FIG. 3 , the plurality of second fins 82 are arranged at intervals in both the up-down and left-right directions. This allows gas moving from the rear of the second heat dissipation body 80 toward the second heat dissipation body 80 to travel in the front-back direction through a fin group consisting of the plurality of second fins 82, and also in the up-down and left-right directions. In this way, the gas moving through the fin group consisting of the plurality of second fins 82 exchanges heat with the second heat dissipation body 80 and moves toward the first heat dissipation body 70.

[0027] The blower 170 is a device that includes a motor 171, a fan 172 that rotates by the driving force of the motor 171, and the like, and generates a flow of gas in the front-to-rear direction. In this embodiment, the blower 170 is fixed to the rear cover 40 that is disposed at the rear end of the housing 20. As shown in FIGS. 2 and 3, the rear cover 40 has a plurality of second ventilation holes 41 in an area facing the blower 170. In this embodiment, the blower 170 operates to draw in gas (atmosphere) outside the housing 20 through the plurality of second ventilation holes 41 and send the drawn-in gas forward. That is, in this embodiment, the blower 170 functions as a device that forcibly creates a flow of gas for efficiently dissipating heat generated by the light-emitting device 100.

[0028] The materials of the above-mentioned components of the lighting device 10 are not particularly limited. The housing 20, front cover 90, rear cover 40, and holding member 300 of the lighting device 10 may be formed, for example, from the same or different types of metal or resin. The first heat sink 70 and the second heat sink 80 of the lighting device 10 may be formed, for example, from the same or different types of metal. The holding member 300 to which the first heat sink 70 and the second heat sink 80 are attached is preferably formed from a metal such as aluminum in order to efficiently conduct heat generated by the light-emitting device 100 to the first heat sink 70 and the second heat sink 80. When the holding member 300 is formed from resin, the resin preferably has high thermal conductivity. The resin forming the holding member 300 may contain a thermally conductive filler to increase thermal conductivity. The housing main body 21 may be formed from metal to improve heat dissipation efficiency, or from resin to suppress temperature rise during use of the lighting device 10. Because lighting device 10 according to this embodiment has a forced cooling structure using fan 170, housing body 21 does not need to function as a heat sink. Therefore, from the standpoint of weight reduction or ease of manufacture, housing body 21 may be formed from resin. Furthermore, if housing body 21 is made of resin, for example, the heat felt by a user when touching outer circumferential surface 22 of housing body 21 while lighting device 10 is turned on can be reduced.

[0029] As described above, in lighting device 10 according to the present embodiment, the gas that has received heat inside housing 20 is discharged into the space in front of lens barrel 200. In the present embodiment, when the gas is discharged into the space in front of lens barrel 200, the gas is discharged with reduced turbulence in the flow of gas. This reduces fluctuations in the illumination light emitted by lighting device 10. Hereinafter, the configuration of first heat sink 70 and its surroundings in lighting device 10 will be described with further reference to FIGS. 5 to 8.

[0030] [2. Configuration of the first heat sink 70 and its surroundings] FIG. 5 is a front view (viewed from the front) showing the configuration of the first heat sink 70 and its surroundings according to the embodiment. The front cover 90 is not shown in FIG. 5. FIG. 6 is a partially enlarged view showing a specific example of the configuration of the first heat sink 70 according to the embodiment. FIG. 7 is a cross-sectional view showing the general configuration of the lighting fixture 10 according to the embodiment. FIG. 8 is a cross-sectional view showing a state in which the blower 170 according to the embodiment sends gas from the front to the rear. FIGS. 7 and 8 simply illustrate a cross-section of the lighting fixture 10, taken along the YZ plane passing through the optical axis L1 (see FIG. 2) of the light source unit 120. In FIGS. 7 and 8, the direction of gas movement is indicated by an outline arrow, and electrical wires connected to the light-emitting device 100 are not shown. Supplementary notes regarding FIGS. 7 and 8 also apply to FIG. 10, which will be described later. FIG. 9 is a schematic diagram showing a lighting fixture 10 according to the embodiment placed on a ceiling 500.

[0031] As shown in FIG. 5 , the first heat dissipation body 70 according to this embodiment is disposed between the lens barrel 200 and the light emitting device 100 and the inner circumferential surface 23 of the housing 20, when viewed from the front. More specifically, the first heat dissipation body 70 is formed in an annular shape surrounding the lens barrel 200 and the light source unit 120. That is, the first heat dissipation body 70 is a cylindrical member having a plurality of first fins 72 on its outer periphery, and the lens barrel 200 and the light emitting device 100 are disposed in the internal space. As shown in FIG. 7 , the lens barrel 200 has a plurality of lenses 260 held in the lens barrel main body 210, including a first lens 261, a second lens 262, a third lens 263, and a fourth lens 264. The number of lenses 260 included in the lens barrel 200 is not limited to four. The number, shape, outer diameter, and the like of the lenses 260 included in the lens barrel 200 may be determined appropriately depending on, for example, the functions required of the lens barrel 200.

[0032] More specifically, in this embodiment, lens barrel 200 and light emitting device 100 are held by holding member 300 and are arranged inside cylindrical first heat dissipation body 70. An annular inner peripheral portion 71 of first heat dissipation body 70 is in contact with holding member 300, and this allows at least a portion of the heat generated by light emitting device 100 to be efficiently conducted to first heat dissipation body 70.

[0033] 2, 3, and 5 to 7, holding member 300 includes a cylindrical holding wall portion 310 and a substrate fixing portion 320 arranged at the rear end of holding wall portion 310. An outer peripheral surface 312 of holding wall portion 310 contacts an inner peripheral portion 71 of first heat dissipation body 70, and an inner peripheral surface 313 of holding wall portion 310 contacts outer peripheral surface 211 of barrel main body 210. In this way, holding member 300 is held by first heat dissipation body 70, and lens barrel 200 is held by holding member 300. As described above, holding member 300 may be configured to enable movement of lens barrel 200 in the front-to-rear direction.

[0034] The holding member 300 may be fixed to the first heat sink 70 by friction between the inner circumferential portion 71 and the outer circumferential surface 312, or by an adhesive or the like disposed between the inner circumferential portion 71 and the outer circumferential surface 312. The holding member 300 may be fixed to the first heat sink 70 with thermal grease or a thermal sheet interposed between the inner circumferential portion 71 and the outer circumferential surface 312. The lens barrel 200 may be fixed to the holding member 300 by friction between the inner circumferential surface 313 and the outer circumferential surface 211, or by an adhesive or the like disposed between the inner circumferential surface 313 and the outer circumferential surface 211. When an adhesive or the like is used for these fixations, it is preferable that the adhesive or the like have high thermal conductivity. The lens barrel 200 may be fixed to the holding member 300 with thermal grease or a thermal sheet interposed between the inner circumferential surface 313 and the outer circumferential surface 211.

[0035] The substrate fixing portion 320 of the holding member 300 is a plate-shaped portion with its thickness oriented in the front-to-rear direction. The light emitting device 100 is fixed to the front surface of the substrate fixing portion 320, and the second heat sink 80 is fixed to the rear surface of the substrate fixing portion 320. The light emitting device 100 may be fixed to the substrate fixing portion 320 using, for example, a fastening member such as a screw, an adhesive, or solder. The light emitting device 100 may be fixed to the substrate fixing portion 320 with thermal grease or a thermal sheet interposed between the substrate fixing portion 320 and the light emitting device 100. The second heat sink 80 may be fixed to the substrate fixing portion 320 using, for example, a fastening member such as a screw, an adhesive, or solder. When an adhesive is used for these fixations, it is preferable that the adhesive have high thermal conductivity. The second heat sink 80 may be fixed to the substrate fixing portion 320 with thermal grease or a thermal sheet interposed between the substrate fixing portion 320 and the second heat sink 80.

[0036] As described above, in the present embodiment, the holding member 300, the lens barrel 200, the light emitting device 100, the first heat dissipator 70, and the second heat dissipator 80 are integrated into a single structure by friction between adjacent members and / or adhesives, etc. Furthermore, the structure is fixed at a predetermined position inside the housing 20. More specifically, in the present embodiment, the tips of the multiple first fins 72 arranged in an annular shape on the first heat dissipator 70 contact the inner circumferential surface 23 of the housing main body 21. A stopper (not shown) that limits movement of the first heat dissipator 70 is provided on the inner circumferential surface 23 at a position along the axial direction of the housing main body 21 (the Y-axis direction in the present embodiment). For example, the first heat dissipator 70 inserted into the housing main body 21 through the opening at the front end thereof is fixed at the position where it abuts against the stopper by friction between the multiple first fins 72 and the inner circumferential surface 23. As a result, the structure including the first heat dissipator 70 is fixed to the housing 20.

[0037] An adhesive or the like may be interposed between the tips of the multiple first fins 72 and the inner circumferential surface 23 of the housing body 21 to improve fixing strength. In this case, the adhesive or the like preferably has high thermal conductivity. Fixing of the structure including the first heat dissipator 70 to the housing 20 does not have to rely on friction between the tips of the multiple first fins 72 and the inner circumferential surface 23 of the housing body 21. For example, a fixing member for fixing the structure may be disposed inside the housing 20. In this case, the multiple first fins 72 included in the first heat dissipator 70 may be disposed spaced apart from the inner circumferential surface 23 of the housing body 21. By disposing the first heat dissipator 70 so that the multiple first fins 72 are spaced apart from the inner circumferential surface 23, for example, when both the first heat dissipator 70 and the housing body 21 are made of metal, electrical insulation between the first heat dissipator 70 and the housing body 21 can be more reliably achieved.

[0038] The method for manufacturing the first heat dissipator 70 according to this embodiment is not particularly limited. For example, as shown in FIG. 6 , each of the multiple first fins 72 may be a plate-like portion bent into a U-shape. Specifically, the multiple first fins 72 may be formed by bending a single strip-shaped metal plate at multiple locations. That is, a single first fin 72 can be formed by folding the metal plate and overlapping it in the thickness direction. Furthermore, by further bending the metal plate, an inner peripheral portion 71 that contacts the outer peripheral surface 312 of the holding wall portion 310 can be formed between adjacent first fins 72. Note that the structure shown in FIG. 6 may be described as multiple inner peripheral portions 71 arranged in the circumferential direction, or as one inner peripheral portion 71 consisting of multiple portions separated in the circumferential direction. By forming multiple first fins 72 in the longitudinal direction of the metal plate, and then rolling the metal plate and connecting both ends by welding or the like, a first heat dissipator 70 (see FIG. 5 ) that is annular when viewed from the front can be formed. In this case, for example, the first fins 72 can be arranged at equal intervals in the circumferential direction at a relatively short pitch. That is, the density of the first fins 72 can be improved. As a result, the surface area of ​​the first heat dissipation body 70 can be relatively increased. This is advantageous for improving the efficiency of heat dissipation via the first heat dissipation body 70. The portions between the metal plates stacked in the circumferential direction in the first fin 72 may be used as spaces through which gas can pass. This, for example, can further increase the effective surface area of ​​the first heat dissipation body 70.

[0039] As described above, lighting fixture 10 configured as described above is provided with blower 170 that forcibly creates a gas flow. As a result, a gas flow from rear to front is formed inside housing 20, as shown in Fig. 7. Specifically, gas at the rear of housing 20 is sucked into blower 170 through multiple second ventilation holes 41 in rear cover 40 and is sent out to the front of blower 170. The gas sent out from blower 170 exchanges heat with second heat dissipation body 80 by coming into contact with multiple second fins 82 and heat dissipation main body 81 of second heat dissipation body 80, and is then sent out further to the front.

[0040] At this time, as shown in FIG. 7 , the flow path of the gas flowing forward from the second heat dissipation body 80 exists only outside the holding member 300. That is, the gas flowing forward from the second heat dissipation body 80 efficiently contacts the first heat dissipation body 70. Specifically, the gas moves forward along the plurality of first fins 72 arranged outside the holding member 300 and inside the inner circumferential surface 23 of the housing main body 21. Each of the plurality of first fins 72 is a thin plate-shaped portion parallel to the Y-axis direction (i.e., the front-rear direction). Therefore, the gas passing through the fin group consisting of the plurality of first fins 72 is rectified and then passes through the plurality of first ventilation holes 91 in the front cover 90 and is discharged forward. More specifically, the plurality of first fins 72 are arranged in a circular pattern at equal intervals. Therefore, the ease of gas passage is unlikely to differ depending on the circumferential position of the plurality of first fins 72 arranged in a circular pattern. As a result, the speed of gas passing between two circumferentially adjacent first fins 72 among the plurality of first fins 72 is substantially constant in the circumferential direction, and the direction of gas flow is parallel to the Y-axis direction, thereby enabling the gas flow to be rectified with greater precision.

[0041] The gas that passes through the first heat sink 70 and is discharged through the multiple first ventilation holes 91 of the front cover 90 travels further forward in the space ahead of the lens barrel 200. At this time, the gas is warmed by receiving heat from the first heat sink 70 and the like. Therefore, if stagnation of the gas (i.e., unevenness in the gas flow rate) occurs in the space ahead of the lens barrel 200, the illumination light passing through the space may fluctuate due to temperature differences within the space. More specifically, light may be refraction at the boundary between gases of different temperatures within the space, which may cause fluctuations in the illumination light. The fluctuations in illumination light may be observed, for example, as uneven brightness of the illumination light or uneven brightness on the wall surface onto which the illumination light is irradiated. In this regard, in the lighting device 10 according to the present embodiment, the gas discharged into the space ahead of the lens barrel 200 is rectified by the first heat sink 70, thereby suppressing unevenness in the gas flow rate. As a result, fluctuations in the illumination light are suppressed, and good illumination light can be provided to the space in which the lighting device 10 is installed.

[0042] As described above, lighting fixture 10 according to this embodiment has the function of forming an image on a wall surface that emits illumination light by individually controlling multiple light-emitting elements 121 (multiple fine LEDs) of light source unit 120. Therefore, if fluctuations occur in the illumination light emitted by light source unit 120, the quality of the image may deteriorate. In this regard, lighting fixture 10 according to this embodiment reduces fluctuations in the flow rate of the heated gas discharged forward from front cover 90, thereby reducing fluctuations in the illumination light emitted by lighting fixture 10. Therefore, deterioration in the quality of the image based on the illumination light is suppressed.

[0043] In this embodiment, as shown in FIG. 7 , the fan 170 operates to send gas behind the fan 170 forward. As a result, the gas that has passed through the interior of the housing 20 is discharged forward from the housing 20. However, as shown in FIG. 8 , the fan 170 may also operate to send gas in front of the fan 170 backward. In this case, the gas that has passed through the flow path formed by the first fins 72 of the first heat sink 70 can be forcibly discharged toward the rear of the housing 20. This allows the heat of the light-emitting device 100 to be efficiently released to the outside without discharging heated gas forward, which would cause fluctuations in the illumination light. In the lighting device 10, the fan 170 may be controlled to switch the direction in which it sends out the gas. That is, the fan 170 may be switchable between a first operation in which the rearward gas is discharged forward and a second operation in which the frontward gas is discharged backward.

[0044] The lighting fixture 10 configured in this manner may include, for example, as shown in FIG. 9, a power supply unit 195 that supplies power to the lighting fixture 10 for lighting the light source unit 120, and a connecting member 190 that connects the power supply unit 195 to the housing 20.

[0045] The power supply device 195 includes a fixing portion for fixing the power supply device 195 to the ceiling 500, and a power supply circuit that converts fixed AC to DC. Specifically, the power supply circuit included in the power supply device 195 rectifies AC voltage input via an electric wire arranged behind (above) the ceiling 500, and smooths the rectified voltage to generate DC voltage. The generated DC voltage is supplied to the light emitting device 100 provided in the housing 20 via an electric wire (not shown). The fixing portion has, for example, an engaging portion that engages with an opening provided in the ceiling 500. The fixing portion may include a mechanism that allows it to be attached to and detached from the ceiling 500.

[0046] One end of the connecting member 190 is fixed to the power supply device 195, and the other end is pivotally supported by the housing 20. This allows the housing 20 to swing so as to tilt up and down. The connecting member 190 may function as an electric wire holding member that holds therein an electric wire (not shown) that connects the power supply device 195 and the light emitting device 100.

[0047] As shown in FIG. 9 , for example, lighting fixture 10 is placed on ceiling 500 with optical axis L1 directed diagonally downward. In this case, illumination light is irradiated onto a sidewall surface of a room including ceiling 500. As a result, an image based on the illumination light, for example, can be formed on the sidewall surface. As described above, the heated gas discharged from the multiple first ventilation openings 91 is rectified by the multiple first fins 72, thereby suppressing unevenness in the flow rate. In other words, the gas has a high tendency to travel in a straight line, or the gas is less likely to stagnate. As a result, fluctuations in the illumination light caused by the heated gas are suppressed.

[0048] Although lighting fixture 10 according to the present embodiment has been described above, the configuration of lighting fixture 10 is not limited to the configuration described in the above embodiment. Therefore, modifications of the configuration of lighting fixture 10 will be described, focusing on the differences from the above embodiment.

[0049] [3. Modifications] Fig. 10 is a cross-sectional view showing the general configuration of lighting device 10a according to a modified embodiment. Fig. 11 is an exploded perspective view showing the general configuration of partition member 180 and sound-absorbing material 185 according to a modified embodiment. Fig. 11 shows second heat dissipation body 80 and components behind second heat dissipation body 80 in lighting device 10a, exploded in the Y-axis direction.

[0050] In addition to the components of lighting fixture 10 according to the embodiment, lighting fixture 10a according to this modification includes partition member 180 disposed between blower 170 and light-emitting device 100. When viewed from the front, partition member 180 is disposed to surround blower section 172a, which is the portion of blower 170 that blows out gas. In this modification, blower section 172a is the front portion of the area in which fan 172 is disposed. Partition member 180 divides the space around and in front of blower 170 inside housing 20 into a first space Sa and a second space Sb.

[0051] That is, a partition member 180 having a trumpet-like or cone-like shape whose diameter increases toward the front is disposed in front of the blower 170. This prevents the gas sent out from the blower section 172a of the blower 170 from moving rearward of the blower section 172a, and allows the gas to move forward more efficiently. As a result, the flow rate per unit time of the gas passing through the first heat radiator 70 and the second heat radiator 80 can be increased. That is, the heat dissipation effect of the first heat radiator 70 and the second heat radiator 80 can be further improved.

[0052] In this modification, blower 170 is supported by support plate 175, which is disposed forward of rear cover 40. Support plate 175 is an annular member having a central airflow opening 177, and is fixed to inner circumferential surface 23 of housing body 21 by a predetermined means such as an adhesive. As such, in lighting device 10a according to this modification, blower 170 is disposed closer to second heat dissipation body 80 than in lighting device 10 according to the embodiment. This allows the gas blown forward from blower 170 to be more efficiently directed at second heat dissipation body 80 and first heat dissipation body 70.

[0053] Furthermore, in this modification, sound-absorbing material 185 is disposed in second space Sb, which is the space behind partition member 180. More specifically, sound-absorbing material 185 is disposed between sound-absorbing material 185 and support plate 175 and in the space around blower 170. This allows sound-absorbing material 185 to absorb at least a portion of the operating noise of blower 170 caused by the rotation of motor 171 and fan 172. As a result, the sound emitted by blower 170 is less likely to be recognized as noise. In other words, lighting fixture 10a equipped with blower 170 is made quieter. Furthermore, second space Sb in which sound-absorbing material 185 is disposed is a space separated from first space Sa, through which gas flows for heat dissipation. Therefore, disposing sound-absorbing material 185 in second space Sb does not substantially affect the heat dissipation.

[0054] Furthermore, in this modification, sound-absorbing material 185 is disposed in a closed space surrounded by partition member 180, support plate 175, blower 170, and housing main body 21. Therefore, unlike when sound-absorbing material is attached to a wall surface near a sound source using an adhesive or pressure-sensitive adhesive, for example, sound-absorbing material 185 is less likely to peel off or become displaced. In other words, the sound-absorbing effect of sound-absorbing material 185 is more likely to be maintained.

[0055] The material for forming sound-absorbing material 185 may be glass wool, rock wool, urethane resin, olefin resin, phenol resin, or a composite material of these. Sound-absorbing material 185 may be produced by previously molding any of these materials into the shapes shown in Figures 10 and 11. In this case, sound-absorbing material 185 can be mass-produced efficiently, for example.

[0056] Furthermore, for example, sound-absorbing material 185 may be formed after partition member 180, blower 170, and support plate 175 are arranged at predetermined positions inside housing main body 21 without sound-absorbing material 185 being present. Specifically, sound-absorbing material 185 having the shape shown in Figs. 10 and 11 may be formed by pouring a predetermined material (such as urethane resin mixed with a foaming agent) through small holes provided in support plate 175 or housing main body 21. In this case, sound-absorbing material 185 can be arranged between sound-absorbing material 185 and support plate 175, and in a state in which the space around the periphery of blower 170 is almost completely filled.

[0057] In this modification, as shown in FIG. 10 , fan 170 operates to blow gas behind fan 170 forward. However, fan 170 according to this modification may also operate to blow gas in front of fan 170 backward, similar to fan 170 according to the embodiment (see FIG. 8 ). In this case, lighting device 10a according to this modification can efficiently release heat from light-emitting device 100 to the outside without discharging heated gas forward, which causes fluctuations in illumination light. In lighting device 10a, fan 170 may be controlled to switch the direction in which it blows gas. That is, fan 170 may be switchable between a first operation in which rearward gas is blown forward and a second operation in which forward gas is blown backward.

[0058] [4. Summary] The lighting fixture according to the first aspect of the present invention is, for example, lighting fixture 10 according to the embodiment, and includes a light emitting device 100 having a light source unit 120 that emits light forward, a lens barrel 200, a first heat sink 70, a blower 170, and a housing 20. The lens barrel 200 is disposed in front of the light emitting device 100 and holds one or more lenses 260. The first heat sink 70 forms a flow path for gas flowing in the front-to-rear direction. The blower 170 is disposed behind the light emitting device 100 and generates the gas flow. The housing 20 accommodates the light emitting device 100, the lens barrel 200, and the first heat sink 70. When viewed from the front, the first heat sink 70 is disposed between the lens barrel 200 and the light emitting device 100 and an inner circumferential surface 23 of the housing 20.

[0059] According to this configuration, a gas flow path is formed by the first heat sink 70 between the lens barrel 200 and the light emitting device 100, which are aligned in the front-to-rear direction, and the inner circumferential surface 23 of the housing 20. Therefore, as shown in FIG. 7 , when the blower 170 blows gas forward, the first heat sink 70 acts to straighten and discharge the gas being discharged forward from the interior of the housing 20. This allows the gas that has absorbed at least a portion of the heat from the light emitting device 100 to be discharged to the outside, and also reduces unevenness in the flow rate of the heated gas in the space in front of the lighting device 10. As a result, fluctuations in the illumination light emitted from the lighting device 10 are reduced. In this way, the lighting device 10 according to this embodiment can reduce fluctuations in the illumination light. These effects can also be achieved by a lighting device 10a according to a modified example (see FIGS. 10 and 11 ), which has a configuration common to the lighting device 10. The same applies to the effects described below.

[0060] The lighting device according to the second aspect of the present invention is the lighting device according to the first aspect, in which the first heat sink 70 is formed in a ring shape surrounding the lens barrel 200 and the light emitting device 100 when viewed from the front.

[0061] According to this configuration, the gas flow path (flow path extending in the front-to-rear direction) formed by first heat dissipation body 70 is disposed over the entire outer periphery of lens barrel 200 and light emitting device 100 when viewed from the front. Therefore, heat from light emitting device 100 can be more efficiently released to the outside, and unevenness in the flow rate of gas discharged in front of lighting fixture 10 can be more reliably suppressed. As a result, fluctuations in illumination light are more reliably suppressed.

[0062] The lighting fixture according to the third aspect of the present invention is the lighting fixture according to the first or second aspect, and further comprises a second heat sink 80 that is disposed between the light emitting device 100 and the blower 170 and is thermally connected to the light emitting device 100.

[0063] With this configuration, at least a portion of the heat emitted from the light emitting device 100 is conducted to the second heat dissipation body 80, and the second heat dissipation body 80 is exposed to the flow of gas generated by the fan 170. That is, heat is efficiently exchanged between the second heat dissipation body 80 and the gas. As a result, the heat of the light emitting device 100 can be more efficiently dissipated to the outside. Even if the gas that has exchanged heat with the second heat dissipation body 80 is discharged to the front of the lighting fixture 10, the first heat dissipation body 70 acts to rectify the flow of the gas and discharge it, thereby suppressing fluctuations in the illumination light emitted from the lighting fixture 10.

[0064] A lighting fixture according to a fourth aspect of the present invention is the lighting fixture according to any one of the first to third aspects, in which the blower 170 operates to blow gas behind the blower 170 forward.

[0065] This configuration forcibly creates a rear-to-front gas flow inside housing 20. As a result, components arranged in front of blower 170 can be efficiently cooled by gas drawn in from the rear and outside housing 20. In other words, heat generated by light-emitting device 100 is more efficiently released to the outside, and first heat sink 70 acts to straighten the gas and exhaust it forward, thereby suppressing fluctuations in the illumination light emitted from lighting device 10.

[0066] A lighting fixture according to a fifth aspect of the present invention may be the lighting fixture according to any one of the first to third aspects, wherein the blower 170 operates to blow gas in front of the blower 170 rearward.

[0067] In this way, when the blower 170 operates to send the gas in the front rearward, the gas that has passed through the flow path formed by the first heat dissipation body 70 can be forcibly discharged toward the rear of the housing 20. This allows the heat of the light emitting device 100 to be efficiently released to the outside without discharging the heated gas forward, which causes fluctuations in the illumination light.

[0068] An illumination device according to a sixth aspect of the present invention is the illumination device according to any one of the first to fifth aspects, and further includes a cylindrical holding member 300 that holds therein the lens barrel 200 and the light emitting device 100. The first heat sink 70 is disposed on the outer peripheral surface of the holding member 300.

[0069] According to this configuration, the lens barrel 200 and the light emitting device 100 can be housed in the housing 20 while being held by the holding member 300. This makes it easy to position the lens barrel 200 relative to the light emitting device 100, for example.

[0070] A lighting fixture according to a seventh aspect of the present invention is the lighting fixture according to any one of the first to sixth aspects, in which the light emitting device 100 has a light source substrate 110 and a light source section 120 that is arranged in front of the light source substrate 110 and emits light forward. The light source section 120 includes a plurality of light emitting elements 121 arranged in a two-dimensional matrix.

[0071] According to this configuration, for example, it is possible to emit illumination light with brightness and darkness for each region by individually controlling the on and off of the plurality of light-emitting elements 121. In other words, by irradiating the wall surface with illumination light, an image according to the brightness and darkness can be formed on the wall surface.

[0072] An illumination device according to an eighth aspect of the present invention is the illumination device according to any one of the first to seventh aspects, and is realized, for example, as illumination device 10a according to the above-described modified example. Lighting device 10a includes partition member 180 arranged between blower 170 and light emitting device 100. Partition member 180 surrounds blower section 172a of blower 170 and divides the space around and in front of blower 170 inside housing 20 into a first space Sa close to light emitting device 100 and a second space Sb behind first space Sa.

[0073] According to this configuration, the gas sent out from blower 170 can be efficiently moved forward, and as a result, the flow rate (amount per unit time) of the gas passing through at least first heat dissipation body 70 can be increased. In other words, the amount of gas exchanging heat with first heat dissipation body 70 can be increased, and as a result, heat from light emitting device 100 can be more efficiently dissipated to the outside. In this way, even if the amount of gas discharged from first heat dissipation body 70 increases, first heat dissipation body 70 acts to rectify and discharge the gas, thereby suppressing fluctuations in the illumination light emitted from lighting device 10a.

[0074] A lighting fixture according to a ninth aspect of the present invention is the lighting fixture according to the eighth aspect, further comprising a sound absorbing material 185 arranged in the second space Sb.

[0075] According to this configuration, sound absorbing material 185 is placed in second space Sb formed by partition member 180. In other words, sound absorbing material 185 is placed around blower 170, thereby suppressing the emission of operating noise of blower 170 to the outside. Since second space Sb is a space that does not need to be involved in the flow of gas for heat dissipation from light emitting device 100, placing sound absorbing material 185 does not substantially affect the heat dissipation.

[0076] (Other embodiments) Although the lighting fixture according to the present invention has been described above based on the above-mentioned embodiment and its modifications, the present invention is not limited to the above-mentioned embodiment and its modifications.

[0077] In the above embodiment, the fan 170 is attached to the rear end surface (rear cover 40) of the housing body 21 in a position facing the front-rear direction. However, the fan 170 may be attached to an opening provided in the housing body 21 that faces in the radial direction of the housing body 21 (for example, the Z-axis direction in FIG. 7). In other words, the fan 170 may be attached to the housing body 21 in a position facing in the radial direction of the cylindrical housing body 21, rather than in the front-rear direction. For example, in FIG. 7, it is assumed that the fan 170 is attached to the rear end of the housing body 21 (a position rearward of the front end of the second heat dissipator 80 in the front-rear direction (Y-axis direction)) in a position facing in the up-down direction (Z-axis direction). In this case, the fan 170 can, for example, suck in gas below the fan 170 and send it upward. In other words, the fan 170 can take gas outside the housing 20 into the housing 20. As a result, the second heat dissipation body 80 and the first heat dissipation body 70 can be cooled by the gas, and the gas that has absorbed heat from the second heat dissipation body 80 and the first heat dissipation body 70 can be discharged forward in a state where the flow of the gas has been rectified by the first heat dissipation body 70. In this case, by blocking the multiple second ventilation holes 41 of the rear cover 40, most of the gas taken into the housing 20 by the blower 170 can be used to cool the second heat dissipation body 80 and the first heat dissipation body 70.

[0078] When the fan 170 is disposed in an opening facing the radial direction of the housing body 21, the fan 170 may operate to exhaust gas inside the housing 20 to the outside of the housing 20. In this case, gas outside the housing 20 can be forced to flow into the inside of the housing 20 through the multiple first ventilation holes 91 of the front cover 90, and the gas can cool the first heat sink 70 and the second heat sink 80. Furthermore, the gas that absorbs heat from the second heat sink 80 and the first heat sink 70 is exhausted radially outward from the housing body 21. Therefore, the heat of the light emitting device 100 can be efficiently released to the outside without exhausting the heated gas forward, which would cause fluctuations in illumination light.

[0079] It is not essential that the first heat dissipation body 70, which is separate from the holding member 300, be attached to the outer peripheral surface 312 of the holding member 300. In other words, the holding member 300 and the first heat dissipation body 70 may be integrated. For example, a holding member (or a first heat dissipation body) having the functions of the holding member 300 and the first heat dissipation body 70 according to the embodiment may be formed by including a cylindrical heat dissipation wall portion and a plurality of first fins extending radially from the outer peripheral surface of the heat dissipation wall portion. For example, the entire holding member may be made of metal, and an insulating treatment such as a resin coating may be applied to the substrate fixing portion on which the light emitting device 100 is disposed.

[0080] In this way, by integrating the first heat dissipation body with the holding member, the heat conducted from the light emitting device 100 to the holding member is conducted more efficiently to the first heat dissipation body, so that the heat of the light emitting device 100 can be dissipated to the outside more efficiently.

[0081] When viewed from the front, the first heat dissipator 70 does not necessarily have to be formed in a ring shape surrounding the lens barrel 200 and the light emitting device 100. In other words, when viewed from the front, the first heat dissipator 70 does not have to be arranged over the entire circumferential area of ​​the holding member 300. For example, when viewed from the front, if the light source unit 120 of the light emitting device 100 is arranged toward the lower part of the housing 20, the first heat dissipator 70 may be arranged only in an area corresponding to the lower half of the housing 20. Even in this case, at least the gas that passes through the first heat dissipator 70 and is discharged forward is rectified by the multiple first fins 72, thereby suppressing unevenness in the speed. As a result, fluctuations in the illumination light are suppressed.

[0082] It is not essential that lighting fixture 10 includes second heat dissipation body 80. By including at least first heat dissipation body 70 out of first heat dissipation body 70 and second heat dissipation body 80, lighting fixture 10 can suppress fluctuations in illumination light when heated gas is discharged forward. If lighting fixture 10 does not include second heat dissipation body 80, it is possible to reduce the weight, size, and / or number of parts of lighting fixture 10.

[0083] In the above embodiment, an example has been shown in which the light emitting element 121 is a minute LED, but this is not limiting. The light emitting element 121 may be an LED of a general size, an organic EL element, or a laser element.

[0084] It is not essential that light source substrate 110 be provided with a control unit that controls the light emission of multiple light-emitting elements 121. The control unit may be provided on a substrate separate from light source substrate 110. The control unit may be disposed inside or outside housing 20. For example, if lighting device 10 is provided with power supply device 195 (see FIG. 9 ), the control unit may be provided in power supply device 195.

[0085] Lighting fixture 10 does not necessarily have to be attached to ceiling 500 of a building. Lighting fixture 10 may also be attached to a wall or a support installed inside or outside a building. The orientation of lighting fixture 10 (housing 20) when lighting fixture 10 is in use is not limited to the orientation shown in FIG. 9. For example, lighting fixture 10 may be attached to a support or a wall with optical axis L1 (see FIG. 2) of light source unit 120 facing upward.

[0086] The shape of housing 20 when viewed from the front is not limited to a circle (see FIG. 5), and may be an oval, polygon, or the like. In this case, first heat dissipator 70 may be formed in a rectangular ring shape when viewed from the front. Housing 20 does not need to be elongated in a direction parallel to optical axis L1 (see FIG. 2) of light source unit 120 (Y-axis direction in the embodiment). Lighting device 10 may have a housing whose width in a direction perpendicular to the Y-axis direction is greater than its width in the Y-axis direction, for example.

[0087] The entire lens barrel 200 does not need to be housed in the housing 20. For example, the front end (end in the positive Y-axis direction) of the lens barrel 200 may protrude further forward than the front end (end in the positive Y-axis direction) of the housing 20. It is not essential that the position of the lens barrel 200 can be adjusted in the front-to-rear direction. For example, one or more lenses 260 held by the lens barrel 200 may be movable in the front-to-rear direction relative to the barrel body 210, thereby enabling focus adjustment of an image based on illumination light.

[0088] In this embodiment, an insect screen (not shown) may be provided on the rear cover 40, which includes multiple second vent holes 41 serving as gas intake ports. This prevents insects from straying into the housing 20 from the outside. As a result, insects that have strayed into the housing 20 are prevented from adversely affecting the optical performance of the lighting device 10. Furthermore, during maintenance (repair, inspection, cleaning, etc.) of the lighting device 10, insects emerging from the housing 20 may startle the worker, reducing the likelihood of the worker dropping and damaging components such as lenses. An insect screen that achieves this effect may be realized using a heat-resistant resin net or a metal net. A decorative panel with ventilation holes and a design that looks good from the outside may also be used as the insect screen. The insect screen may also have the function of making it difficult for the inside of the housing 20 to be seen from the outside. When the gas intake ports are a plurality of first ventilation ports 91 provided on the front cover 90 (see FIG. 8), an insect screen (not shown) may be provided on the front cover 90.

[0089] The above supplementary information regarding lighting fixture 10 according to the embodiment may also be applied to lighting fixture 10a according to the modified example, as appropriate. The present invention also includes various modifications that would occur to those skilled in the art to the embodiments and modifications, as well as modifications realized by arbitrarily combining the components and functions of the embodiments and modifications without departing from the spirit of the present invention. The present invention also includes any combination of two or more claims from the claims set forth in the scope of the patent application at the time of filing, provided that they are not technically inconsistent. [Explanation of symbols]

[0090] 10, 10a Lighting fixtures 20 Case 23 Inner surface 70 First heat sink 71 Inner circumference 72 First Fin 80 Second heat sink 100 Light-emitting device 110 Light source board 120 Light source section 121 Light-emitting element 170 Blower 180 Partition member 185 Sound-absorbing material 200 lens barrel 260 Lens 300 Retaining member 312 Outer surface Sa first space Sb second space

Claims

1. a light-emitting device having a light source unit that emits light forward; a lens barrel for holding one or more lenses, the lens barrel being disposed in front of the light emitting device; a first heat dissipating body that forms a flow path for gas flowing in the front-rear direction; a blower disposed behind the light-emitting device and configured to generate the gas flow; a housing that houses the light emitting device, the lens barrel, and the first heat dissipation body, the first heat dissipation body is disposed between the lens barrel and the light emitting device and an inner peripheral surface of the housing when viewed from the front. Lighting fixtures.

2. the first heat dissipation body is formed in an annular shape surrounding the lens barrel and the light emitting device when viewed from the front.

10. The lighting fixture of claim 1.

3. The light emitting device further includes a second heat sink disposed between the light emitting device and the air blower and thermally connected to the light emitting device.

3. A lighting fixture according to claim 1 or 2.

4. The blower operates to blow the gas behind the blower toward the front.

3. A lighting fixture according to claim 1 or 2.

5. The blower operates to blow the gas in front of the blower toward the rear.

3. A lighting fixture according to claim 1 or 2.

6. further comprising a cylindrical holding member that holds the lens barrel and the light emitting device therein; The first heat dissipation body is disposed on the outer peripheral surface of the holding member.

3. A lighting fixture according to claim 1 or 2.

7. the light emitting device includes a light source substrate and a light source unit that is disposed on a front surface of the light source substrate and emits the light forward; the light source unit includes a plurality of light-emitting elements arranged in a two-dimensional matrix.

3. A lighting fixture according to claim 1 or 2.

8. The air conditioner further includes a partition member disposed between the air blower and the light-emitting device, the partition member surrounds the blower unit of the blower and divides the space around the periphery of the blower and in front of the blower inside the housing into a first space close to the light-emitting device and a second space behind the first space.

3. A lighting fixture according to claim 1 or 2.

9. Further, a sound absorbing material is disposed in the second space.

9. A lighting fixture according to claim 8.

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