Lighting fixture

Abstract

To provide a lighting fixture improved in reliability.SOLUTION: A lighting fixture 10 includes a light-emitting device 100, a radiator 80, a lens barrel 200 and a housing 20. The light-emitting device 100 includes a light source part 120 emitting light forward. The radiator 80 is connected to the light-emitting device 100. The lens barrel 200 is disposed in front of the light-emitting device 100 and also holds at least one lens 260. The housing 20 includes a cooling flow passage 60, and a space forming part 150. In the cooling flow passage 60, gas coming in contact with the radiator 80 flows and longitudinally passes through a side of the light-emitting device 100 in a cross direction orthogonal to the longitudinal direction. A space forming part 150 forms a light source space 160 facing the light source part 120 and the lens barrel 200. The space forming part 150 has an opening part 151 connecting the inside of the light source space 160 and the cooling flow passage 60, and forms the light source space 160 closed at parts other than the opening part 151.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Patent Document 1 discloses an illumination device. This illumination device is provided with a housing, a partition plate, a light shielding portion, a light source, and a heat dissipation fin. The housing has a first surface having a first hole, and a second surface having a second hole and facing the first surface. The partition plate has a third hole penetrating in the thickness direction, and divides the inside of the housing into a space on the first surface side and a space on the second surface side. The light shielding portion extends between the first surface and the partition plate, and divides the space on the first surface side into a space on the center side and a space on the housing side. The light source is provided in the space on the center side and has a light emitting element. The heat dissipation fin is provided in the space on the second surface side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-22580 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above conventional lighting device, the light source is provided in a space inside a cylindrical light-shielding part that is open at both ends, and one opening of the light-shielding part is blocked by an optical element part, and the other opening is blocked by a heat dissipation part. As a result, the heat generated by the light source tends to be trapped inside the space, which is a cause of problems such as deterioration of the light source. In order to solve this problem, for example, it is possible to apply gas flowing inside the housing to the light source (to flow the gas along the light source). However, in this case, foreign matter such as dust or dirt contained in the gas tends to adhere to the light source, which may result in problems such as a decrease in the quality of the illumination light.

[0005] The present invention was made by the inventors of the present application with a new focus on the above-mentioned problems, and has an object to provide a lighting fixture with improved reliability. [Means for solving the problem]

[0006] A lighting fixture according to one embodiment of the present invention comprises a light-emitting device having a light source unit that emits light forward, a heat sink connected to the light-emitting device, a lens barrel that holds one or more lenses and is arranged in front of the light-emitting device, and a housing that houses the light-emitting device, the heat sink, and the lens barrel, wherein the housing has a cooling flow path through which gas in contact with the heat sink flows, the cooling flow path passing in the front-to-back direction on the side of the light-emitting device in a lateral direction perpendicular to the front-to-back direction, and a space forming portion that forms a light source space facing the light source unit and the lens barrel, and the space forming portion has an opening that connects the interior of the light source space to the cooling flow path, and forms the light source space that is closed in parts other than the opening. Effect of the Invention

[0007] According to the present invention, it is possible to provide a lighting fixture with improved reliability. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a lighting fixture according to an embodiment. [Diagram 2] FIG. 2 is a first exploded perspective view of the lighting device according to the embodiment. [Diagram 3] FIG. 3 is a second exploded perspective view of the lighting device according to the embodiment. [Figure 4] FIG. 4 is a schematic plan view of a light source unit according to the embodiment. [Diagram 5] FIG. 5 is a front view showing the outline of the configuration of a lighting fixture according to an embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing a schematic configuration of a lighting fixture according to an embodiment. [Figure 7]FIG. 7 is a schematic diagram showing a state in which a lighting fixture according to an embodiment is placed on a ceiling. [Figure 8] FIG. 8 is a cross-sectional view showing a schematic configuration of a lighting fixture according to the first modification of the embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a schematic configuration of a lighting fixture according to the second modification of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the following, a lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangements and connection forms of the components 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 described in the independent claims will be described as optional components.

[0010] In addition, each figure is a schematic diagram and is not necessarily illustrated precisely. Therefore, for example, the scales in each figure do not necessarily match. In addition, in each figure, substantially the same configuration is given the same reference numerals, and duplicated 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 appropriately determined depending on the purpose or use, etc.

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

[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 Figs. 1 to 4. Fig. 1 is a perspective view showing an outline of the configuration of lighting fixture 10 according to the embodiment. Fig. 2 is a first exploded perspective view of lighting fixture 10 according to the embodiment. Fig. 2 shows an exploded perspective view of lighting fixture 10 as viewed obliquely from the front. Fig. 3 is a second exploded perspective view of lighting fixture 10 according to the embodiment. Fig. 3 shows an exploded perspective view of lighting fixture 10 as viewed obliquely from the rear. Fig. 4 is a schematic plan view of a light source unit 120 according to the embodiment.

[0013] 1, the lighting fixture 10 is, for example, a spotlight, and is attached to a wiring fixture (for example, a wiring duct or a ceiling hook) provided on a ceiling or a wall. The lighting fixture 10 may also be a downlight or a ceiling light.

[0014] As shown in FIGS. 1 to 3, the lighting fixture 10 includes a light emitting device 100, a heat sink 80, a lens barrel 200, and a housing 20. The light emitting device 100 includes a light source unit 120 that emits light forward, and a light source substrate 110 on which the light source unit 120 is disposed. In this embodiment, the positive direction of the Y axis is treated as the main emission direction of light from the light source unit 120 (i.e., forward). That is, in this embodiment, the optical axis L1 (see FIG. 2) of the light source unit 120 is parallel to the Y axis direction. An electric wire 130 (not shown in FIGS. 2 to 4) that supplies power for the light source unit 120 to emit light and / or a control signal for controlling the light source unit 120 is connected to the light source substrate 110. The electric wire 130 will be described later with reference to FIG. 6.

[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 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, a blue light-emitting element and a yellow phosphor. The yellow phosphor is disposed on the light emission side (front) of the blue light-emitting element. The blue light-emitting element is, for example, an LED (Light Emitting Diode). The blue light-emitting element is, for example, a minute LED with a size of 100 μm×100 μm or less. The yellow phosphor is a phosphor that is excited by blue light and emits yellow light. A mixture of the yellow light and the blue light that has passed through the yellow phosphor is the white light emitted from the light-emitting element 121. The yellow phosphor is, for example, a YAG (yttrium aluminum garnet) phosphor, but is not limited thereto.

[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 controls each of the multiple light-emitting elements 121 independently. That is, the control unit can individually control the on / off, light emission intensity, light emission time, etc. of each of the multiple light-emitting elements 121. For example, the lighting fixture 10 can emit illumination light with brightness and darkness for each region by individually controlling the on / off of the multiple light-emitting elements 121. That is, by irradiating the illumination light onto, for example, a wall surface, an image according to the brightness and darkness can be formed on the wall surface.

[0019] It is not essential that the light source unit 120 includes a plurality of light-emitting elements 121. The light source unit 120 may include one or more light-emitting elements 121 according to the specifications required for the lighting fixture 10. The plurality of 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 a plurality of light-emitting elements 121, each of the plurality of light-emitting elements 121 does not need to be individually controlled. The plurality of light-emitting elements 121 may be synchronously controlled to be turned on and off collectively.

[0020] The light emitting device 100 is connected to the heat sink 80. Specifically, the light emitting device 100 is fixed to the heat sink 80 in a state where the rear surface (surface facing rearward (negative Y-axis direction)) of the light source substrate 110 is connected to the heat sink 80 directly or indirectly via an insulating member or the like. The light emitting device 100 is fixed to the heat sink 80 using a fixing member such as an adhesive and / or a screw.

[0021] In this embodiment, the heat sink 80 is provided in the lighting device 10 as a structure integral with the housing 20. For example, the metal heat sink 80 is provided integrally with the metal housing 20. As shown in FIG. 3, the heat sink 80 includes a plurality of heat sink fins 81. The plurality of heat sink fins 81 include a first heat sink fin 81a and a second heat sink fin 81b extending in directions intersecting each other. When the housing 20 integrally including the heat sink 80 is manufactured, the housing 20 may be manufactured by, for example, connecting a member having the heat sink 80 and a member having a portion in front of the heat sink 80 by a predetermined method (such as welding or bolt fastening). This allows the housing 20 to be manufactured integrally including the heat sink 80 having a complex shape.

[0022] It is not essential that the heat sink 80 is integrally provided in the housing 20. The heat sink 80, which is separate from the housing 20, may be connected to the housing 20 by a predetermined method (welding, bonding, fastening with bolts, etc.), thereby disposing the heat sink 80 inside the housing 20. In this case, for example, the housing 20 may be made of resin and the heat sink 80 may be made of metal.

[0023] Lens barrel 200 is an optical member equipped with one or more lenses 260. In this embodiment, lens barrel 200 adds a predetermined optical effect to the 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.

[0024] As shown in Figs. 2 and 3, the lens barrel 200 has a barrel body 210 and, for example, two lenses 260 (a first lens 261 and a second lens 262) fixed to the barrel body 210. The number, shape, and outer diameter of the lenses 260 included in the lens barrel 200 are appropriately determined, for example, according to the functions required of the lens barrel 200. In this embodiment, the lens barrel 200 is movable in the front-rear direction relative to the light emitting device 100 (position adjustment in the front-rear direction is possible). This allows the position of the lens barrel 200 to be adjusted according to the distance between the 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. That is, the lighting device 10 according to this embodiment allows the focus adjustment of an image based on the illumination light.

[0025] In lighting device 10 configured in this manner, a cooling flow path 60 is formed inside housing 20, through which gas in contact with heat sink 80 flows. Furthermore, cooling flow path 60 is connected to the space between light emitting device 100 and lens barrel 200, and is configured so that gas flowing through cooling flow path 60 is unlikely to flow into that space. Hereinafter, the configuration of cooling flow path 60 and its surroundings in lighting device 10 will be described with further reference to Figs. 5 to 7.

[0026] [2. Configuration of the cooling channel 60 and its surroundings] FIG. 5 is a front view (viewed from the front) showing the outline of the configuration of lighting fixture 10 according to the embodiment. FIG. 6 is a cross-sectional view showing the outline of the configuration of lighting fixture 10 according to the embodiment. FIG. 6 shows a cross-section of lighting fixture 10 in a simplified manner, which is a cross-section in a YZ plane passing through optical axis L1 (see FIG. 2) of light source unit 120. In FIG. 6, the movement direction of gas in cooling flow passage 60 is indicated by a hollow arrow, and electric wire 130 connected to light emitting device 100 is indicated typically by a thick dotted line. FIG. 7 is a schematic diagram showing lighting fixture 10 according to the embodiment arranged on ceiling 500.

[0027] 5 and 6, the housing 20 includes a cooling flow path 60 through which gas in contact with the heat sink 80 flows. In this embodiment, the cooling flow path 60 is provided as a gas flow path connecting the first ventilation part 40 and the second ventilation part 50 provided in the housing 20. In FIG. 6, the gas (air) that flows into the housing 20 from the second ventilation part 50 is shown flowing out of the housing 20 from the first ventilation part 40, but the direction of gas movement may be reversed.

[0028] The gas outside the housing 20 flows into the inside of the housing 20 (cooling flow path 60) from one of the first ventilation part 40 and the second ventilation part 50 and removes heat from the heat dissipation body 80. The gas that has removed the heat from the heat dissipation body 80 flows out to the outside of the housing 20 from the other of the first ventilation part 40 and the second ventilation part 50.

[0029] 5 and 6, the cooling flow path 60 is provided between the heat sink 80 and the inner surface 23 of the side wall portion 21 of the housing 20 (hereinafter also referred to as "the inner surface 23 of the housing 20"), and between the lens barrel 200 and the inner surface 23 of the housing 20 in the front-rear direction. One end of the cooling flow path 60 provided inside the housing 20 in this manner is connected to the outside of the housing 20 via the first ventilation portion 40. The other end of the cooling flow path 60 is connected to the outside of the housing 20 via the second ventilation portion 50.

[0030] In this embodiment, the housing 20 has a side wall portion 21 forming a side surface 22 in a lateral direction perpendicular to the front-rear direction, and a rear wall portion 25 forming a rear end surface of the housing 20. The "lateral direction" in this embodiment is a radial direction of the housing 20, which has a circular outer shape in a front view. The "lateral direction" can also be described as a direction perpendicular to the optical axis L1 (see FIG. 2) and extending from the optical axis L1 or toward the optical axis L1. The first ventilation portion 40 has one or more through holes 41 formed in the rear wall portion 25. More specifically, the rear wall portion 25 has a plurality of through holes 41, each of which is elongated in the Z-axis direction.

[0031] In this embodiment, the housing 20 has a barrel support 29 (see FIGS. 2 and 5) that protrudes inward from the inner surface 23. The lens barrel 200 is supported by the barrel support 29 so as to be movable in the front-rear direction. As shown in FIG. 5, the barrel support 29 extends along the circumferential direction on the inner surface 23 of the housing 20. When viewed from the front, the barrel support 29 is provided in a range that is a part of the circumferential direction of the inner surface 23 of the housing 20, and is more than half the circumference. In other words, there is a range in the circumferential direction on the inner surface 23 of the housing 20 where the barrel support 29 is not provided. In this embodiment, the front end of the gap between the lens barrel 200 and the inner surface 23 of the housing 20 in this range functions as the second ventilation section 50.

[0032] The housing 20 having the cooling flow path 60 of this embodiment is further provided with a space forming section 150. The space forming section 150 forms a light source space 160 facing the light source section 120 and the lens barrel 200. In this embodiment, the space forming section 150 includes the rear end section 201 of the lens barrel 200, the front end surface 26 of the heat sink 80, and the inner surface 23 of the housing 20, as shown in FIG. 6. The space forming section 150 has one opening section 151 that connects the inside of the light source space 160 to the cooling flow path 60, and the light source space 160 is closed except for the opening section 151.

[0033] That is, the gas inside the light source space 160 can come into contact with the gas flowing through the cooling flow path 60 at the opening 151, and the inflow of the gas flowing through the cooling flow path 60 into the light source space 160 is suppressed. Specifically, the gas inside the light source space 160 expands by being heated by the heat generated by the light emitting device 100. Since the light source space 160 is closed except for the opening 151, a part of the expanded air is pushed out from the opening 151 to the cooling flow path 60. As a result, the gas flowing through the cooling flow path 60 is less likely to flow into the light source space 160 from the opening 151. Furthermore, the gas flowing through the cooling flow path 60 can take at least a part of the heat of the gas inside the light source space 160 by coming into contact with the gas inside the light source space 160 at the opening 151. As a result, the temperature rise of the light source unit 120 facing the light source space 160 can be suppressed.

[0034] Here, the gas flowing through the cooling flow passage 60 is the gas that has flowed into the housing 20 via the first ventilation part 40 or the second ventilation part 50. Therefore, the gas flowing through the cooling flow passage 60 may contain foreign matter such as dust or dirt from outside the housing 20. Therefore, when the gas is directed at the light source unit 120, the foreign matter contained in the gas may adhere to the surface of the light source unit 120, which may result in a deterioration in the quality of the illumination light emitted from the lighting device 10.

[0035] More specifically, lighting fixture 10 according to the present embodiment has a function of forming an image on a wall surface that emits illumination light by individually controlling a plurality of light emitting elements 121 (a plurality of fine LEDs) of light source unit 120. Therefore, if a foreign object adheres to light source unit 120, the quality of the image may be reduced even if the foreign object is fine. In this regard, in lighting fixture 10 according to the present embodiment, light source space 160 facing light source unit 120 is closed except for opening 151, so that the inflow of gas containing foreign objects into light source space 160 is suppressed as described above. In other words, lighting fixture 10 according to the present embodiment employs a structure that brings gas (first gas) flowing through cooling flow passage 60 into contact with gas (second gas) inside light source space 160 and suppresses the inflow of the first gas into light source space 160.

[0036] As shown in FIG. 6, the opening 151 of the space forming part 150 can also be used to pull out the electric wire 130 connected to the light emitting device 100 from the light source space 160. In other words, the opening 151 for pulling out the electric wire 130 connected to the light emitting device 100 from the light source space 160 can be used as an opening for suppressing a temperature rise of the gas inside the light source space 160. In other words, by providing the opening 151 for pulling out the electric wire 130 in the space forming part 150 that forms the light source space 160, even if the light source space 160 is connected to the outside space, it is sufficient that the light source space 160 is a space closed except for the opening 151. Thereby, as described above, the inflow of gas containing foreign matter into the light source space 160 is suppressed, and the temperature rise of the light source part 120 is suppressed.

[0037] In this embodiment, the electric wire 130 connected to the light emitting device 100 passes through the opening 151 and the cooling flow path 60, and is drawn out from the rear end of the housing 20 to the outside of the housing 20. The electric wire 130 drawn out to the outside of the housing 20 is connected to, for example, a power supply device or the like (not shown) that generates power for turning on the light emitting device 100 and / or a control signal for controlling the light source unit 120.

[0038] During normal use of the lighting fixture 10, the lighting fixture 10 is disposed in a position in which the opening 151 of the space forming portion 150 is located lower than the light source portion 120 in the vertical direction. For example, as shown in Fig. 7, the lighting fixture 10 may include a connection member 190 that connects the housing 20 to a ceiling 500 of a building. The connection member 190 is an adapter, an arm, or the like that connects the housing 20 to the ceiling 500 or the like. The connection member 190 is attached to a wiring device (for example, a wiring duct or a hook-on ceiling) provided on the ceiling 500.

[0039] 7, the lighting fixture 10 is placed on the ceiling 500 with the optical axis L1 of the light-emitting device 100 (light source section 120) facing diagonally downward. In this state, the opening 151 of the space forming section 150 is located lower than the light source section 120 in the up-down direction. Therefore, for example, foreign matter contained in the gas flowing through the cooling flow passage 60 is prevented from flowing into the light source space 160 through the opening 151 due to gravity.

[0040] Although lighting device 10 according to the present embodiment has been described above, the configuration of lighting device 10 is not limited to that described in the above embodiment. Therefore, modifications of the configuration of lighting device 10 will be described below, focusing on the differences from the above embodiment.

[0041] [3-1. Variation 1] Fig. 8 is a cross-sectional view showing the general configuration of lighting fixture 10a according to the first variation of the embodiment. In Fig. 8, the direction of gas movement in cooling flow passage 60 is indicated by a hollow arrow, and electric wire 130 (see Fig. 6) connected to light emitting device 100 is omitted. These supplementary notes regarding Fig. 8 also apply to Fig. 9 described later.

[0042] Lighting device 10a according to the first modification includes, in addition to the components of lighting device 10 according to the embodiment, blower 170 that forcibly creates a flow of gas. Specifically, blower 170 has a fan, a motor for rotating the fan, and the like, and is disposed, for example, on the inside (front) of rear wall portion 25a that has first ventilation section 40. This enables blower 170 to increase the amount of gas passing through first ventilation section 40 (airflow rate per unit time). In this modification, blower 170 operates to suck gas outside housing 20 into housing 20 via first ventilation section 40.

[0043] This increases the amount of gas flowing through the cooling flow passage 60 (the amount of gas flowing in and out per unit time), and more efficiently cools the gas inside the heat sink 80 and the light source space 160. As a result, the effect of suppressing the temperature rise of the light source unit 120 by the gas flowing through the cooling flow passage 60 is improved.

[0044] The blower 170 may operate to exhaust the gas inside the housing 20 to the outside through the first ventilation section 40. In this case, the gas inside the cooling flow passage 60 moves from the second ventilation section 50 toward the first ventilation section 40. That is, by operating the blower 170, the amount of gas flowing from the second ventilation section 50 into the cooling flow passage 60 (airflow rate per unit time) increases, and as a result, the gas inside the heat sink 80 and the light source space 160 is cooled more efficiently.

[0045] In this modification, the blower 170 is disposed adjacent to the first ventilation section 40. However, the position of the blower that forcibly creates the gas flow is not limited to this. The blower may be disposed in a position close to the second ventilation section 50, or may be disposed anywhere between the first ventilation section 40 and the second ventilation section 50.

[0046] Illumination fixture 10a according to this modification may include a connection member 190 (see FIG. 7) that connects housing 20 to ceiling 500 of a building. This allows illumination fixture 10a to be placed on ceiling 500 with optical axis L1 of light-emitting device 100 (light source unit 120) facing diagonally downward, for example.

[0047] [3-2. Variation 2] Fig. 9 is a cross-sectional view showing an outline of the configuration of lighting fixture 10b according to Modification 2 of the embodiment. Lighting fixture 10b shown in Fig. 9 differs from lighting fixture 10 according to the embodiment in that first ventilation section 40b has one or more through holes 41b penetrating side wall section 21 of housing 20. Specifically, first ventilation section 40b according to this modification has one or more through holes 41b formed on one lateral side (positive Z-axis direction in Fig. 9) of side wall section 21. Rear wall section 25b according to this modification does not have a through hole connected to cooling flow path 60, and closes the rear end opening of cylindrical side wall section 21.

[0048] 9, the gas that has flowed into the inside of the housing 20 (cooling flow passage 60) from the second ventilation section 50 moves in the negative Y-axis direction (i.e., rearward) and passes by the side of the light emitting device 100 in the negative Z-axis direction. Thereafter, the gas moves in the positive Z-axis direction along the heat sink 80 and flows out of the housing 20 from the first ventilation section 40b. Alternatively, the gas that has flowed into the inside of the housing 20 (cooling flow passage 60) from the first ventilation section 40b moves in the negative Z-axis direction along the heat sink 80. Thereafter, the gas moves in the positive Y-axis direction (i.e., forward), passes by the side of the light emitting device 100 in the negative Z-axis direction, and flows out of the housing 20 from the second ventilation section 50.

[0049] Even when the cooling flow passage 60 is formed as described above, the gas flowing through the cooling flow passage 60 can contact the heat dissipation body 80 and the gas inside the light source space 160. That is, the heat of the heat dissipation body 80 and the heat of the gas inside the light source space 160 can be taken away by the gas flowing through the cooling flow passage 60. As a result, the temperature rise of the light source unit 120 is suppressed.

[0050] Illumination fixture 10b according to this modification may include a connection member 190 (see FIG. 7) that connects housing 20 to ceiling 500 of a building. This allows illumination fixture 10b to be placed on ceiling 500 with optical axis L1 of light-emitting device 100 (light source unit 120) facing diagonally downward, for example.

[0051] [4. Summary] As described above, the lighting device according to the first aspect of the present invention is, for example, the lighting device 10 according to the embodiment, and includes the light emitting device 100, the heat sink 80, the lens barrel 200, and the housing 20 that houses the light emitting device 100, the heat sink 80, and the lens barrel 200. The light emitting device 100 has a light source unit 120 that emits light forward. The heat sink 80 is connected to the light emitting device 100. The lens barrel 200 is disposed in front of the light emitting device 100 and holds one or more lenses 260. The housing 20 has a cooling flow path 60 and a space forming unit 150. The cooling flow path 60 allows gas that has come into contact with the heat sink 80 to flow, and passes in the front-rear direction along the side of the light emitting device 100 in the lateral direction perpendicular to the front-rear direction. The space forming unit 150 forms a light source space 160 that faces the light source unit 120 and the lens barrel 200. The space forming portion 150 has an opening 151 that connects the inside of the light source space 160 with the cooling flow path 60, and forms the light source space 160 that is closed in the portion other than the opening 151.

[0052] In this way, the light source space 160 facing the light source unit 120 of the light emitting device 100 is connected to the cooling flow path 60 via the opening 151. Therefore, heat exchange is performed between the gas flowing through the cooling flow path 60 and the gas inside the light source space 160. That is, at least a part of the heat of the gas warmed by the light emitting device 100 inside the light source space 160 is taken by the gas flowing through the cooling flow path 60. That is, the gas inside the light source space 160 is cooled. As a result, the temperature rise of the light source unit 120 is suppressed. This contributes to suppressing deterioration of the light source unit 120, for example. Since the light source space 160 is closed except for the opening 151, the gas flowing through the cooling flow path 60 is unlikely to flow into the light source space 160. This suppresses adhesion of foreign matter such as dust or dirt contained in the gas for cooling to the light source unit 120. As a result, deterioration of the quality of the illumination light emitted to the outside through the lens barrel 200 is suppressed. In this way, the lighting device 10 according to this embodiment is a lighting device 10 with improved reliability.

[0053] A lighting device according to a second embodiment of the present invention is the lighting device according to the first embodiment, in which the housing 20 has a side wall portion 21 that forms a side surface 22 in the lateral direction (Z-axis direction). The cooling flow path 60 is formed along an inner surface 23 of the side wall portion 21, which is the surface opposite to the side surface 22 (see FIGS. 5 and 6).

[0054] According to this configuration, the gas flowing through the cooling flow path 60 flows along the inner surface 23 of the side wall portion 21 of the housing 20. Therefore, the side wall portion 21 can efficiently remove heat from the gas flowing through the cooling flow path 60. In other words, heat exchange between the gas flowing through the cooling flow path 60 and the housing 20 is efficiently performed. As a result, the heat sink 80 in contact with the gas flowing through the cooling flow path 60 and the gas inside the light source space 160 are efficiently cooled.

[0055] An illumination device according to a third aspect of the present invention is the illumination device according to the second aspect, in which lens barrel 200 has an outer peripheral surface 211 facing inner surface 23 of side wall portion 21. At least a portion of cooling flow path 60 is formed between inner surface 23 and outer peripheral surface 211 (see FIGS. 5 and 6).

[0056] According to this configuration, the cooling flow path 60 is formed by utilizing the gap between the inner surface 23 of the side wall portion 21 of the housing 20 and the outer peripheral surface 211 of the lens barrel 200. Therefore, for example, an increase in the size of the housing 20 due to the provision of the cooling flow path 60 is suppressed.

[0057] In this embodiment and its modified example, the outer shape of the lens barrel 200 is circular when viewed from the front, and the side wall 21 of the housing 20 is formed into a cylindrical shape. Furthermore, when viewed from the front, the center P2 of the lens barrel 200 is located away from the center P1 of the housing 20 (side wall 21) (see FIG. 5). Specifically, the center P2 of the lens barrel 200 is located away from the center P1 of the side wall 21 in the positive direction of the Z axis. As a result, a relatively large gap is formed between the lens barrel 200 and the inner surface 23 of the side wall 21 in the negative direction of the Z axis of the lens barrel 200. In this embodiment, the gap is used as a part of the cooling flow path 60.

[0058] The lighting device according to a fourth aspect of the present invention is the lighting device according to any one of the first to third aspects, and the housing 20 has a first ventilation part 40 that connects one end of the cooling flow path 60 to the outside of the housing 20, and a second ventilation part 50 that connects the other end of the cooling flow path 60 to the outside of the housing 20. The first ventilation part 40 is located behind the front end of the heat sink 80 (front end surface 26 in this embodiment). The second ventilation part 50 is located forward of the light source space 160 in the front-rear direction.

[0059] According to this configuration, the cooling flow passage 60 is formed to pass through at least the front end of the heat sink 80 and the light source space 160 in the front-rear direction. This allows the gas flowing in from the first ventilation section 40 or the second ventilation section 50 to be more reliably brought into contact with the gas inside the heat sink 80 and the light source space 160. Note that, in the above configuration, the position of the second ventilation section 50 in the front-rear direction may be located forward of the light source space 160. Therefore, for example, the second ventilation section 50 may be configured by one or more through holes provided in a portion of the side wall section 21 in the negative Z-axis direction (see FIG. 6), and the position in the front-rear direction may be located forward of the light source space 160.

[0060] A lighting fixture according to a fifth aspect of the present invention is the lighting fixture according to the fourth aspect, in which the first ventilation section 40 has one or more through holes 41 formed in the rear wall section 25 that forms the rear end face of the housing 20.

[0061] In other words, in this embodiment, the cooling flow path 60 extends to the rear end of the housing 20, and therefore the gas flowing through the cooling flow path 60 can more efficiently remove heat from the heat sink 80 located behind the light emitting device 100.

[0062] A lighting device according to a sixth aspect of the present invention is the lighting device according to the fourth aspect, and is realized, for example, as lighting device 10b according to the above-mentioned modified example 2. In lighting device 10b, first ventilation section 40b has one or more through holes 41b formed on one lateral side (positive Z-axis direction) in side wall section 21 forming side surface 22 in the lateral direction (Z-axis direction) of housing 20. Cooling flow path 60 extends from first ventilation section 40 toward the other lateral side (negative Z-axis direction) along heat sink 80, and passes beside light emitting device 100 on the other lateral side (negative Z-axis direction).

[0063] According to this configuration, the gas can flow from one side to the other side in the lateral direction of the heat sink 80. Therefore, the gas flowing through the cooling flow passage 60 can efficiently come into contact with a wide range of the heat sink 80 in the lateral direction while removing heat from the gas inside the light source space 160.

[0064] 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, further comprising an electric wire 130 connected to the light emitting device 100. The electric wire 130 passes through the opening 151 and is drawn from the inside of the light source space 160 to the outside.

[0065] In this manner, the electric wire 130 for supplying power to the light emitting device 100 and / or transmitting a control signal can be arranged by utilizing the opening 151. Therefore, it is not necessary to provide a hole or the like dedicated to the electric wire 130 in the space forming part 150. Even if the opening 151 for drawing out the electric wire 130 is provided in the space forming part 150, the light source space 160 is closed except for the opening 151. Therefore, the inflow of gas containing foreign matter into the light source space 160 is suppressed.

[0066] 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, further comprising a connection member 190 that connects the housing 20 to a ceiling 500 of a building. When the housing 20 is connected to the ceiling 500 by the connection member 190, the opening 151 is located lower than the light source unit 120 in the up-down direction.

[0067] According to this configuration, the opening 151 is located lower than the light source unit 120 in the up-down direction. Therefore, for example, foreign matter contained in the gas flowing through the cooling flow passage 60 is prevented from flowing into the light source space 160 through the opening 151 due to gravity.

[0068] (Other embodiments) Although the lighting fixture according to the present invention has been described based on the above-mentioned embodiment and its modified examples, the present invention is not limited to the above-mentioned embodiment and modified examples.

[0069] In the above embodiment, the entire light emitting device 100 is included in the light source space 160 (see FIG. 6). However, it is sufficient that at least the light source unit 120 of the entire light emitting device 100 faces the light source space 160. For example, the non-light source area of ​​the light source substrate 110 other than the light source unit 120 may not face the light source space 160 by covering the area (non-light source area) of the light source substrate 110 with an insulating member or the like. That is, the light source unit 120 is exposed to the gas (second gas) inside the light source space 160, and thus can exchange heat with the gas (first gas) flowing through the cooling flow passage 60 via the second gas. In addition, since the first gas is unlikely to flow into the light source space 160, the possibility that foreign matter contained in the first gas will adhere to the light source unit 120 is reduced.

[0070] In the above embodiment, the light emitting element 121 is a minute LED, but is not limited to this. The light emitting element 121 may be an LED of a general size, an organic EL element, or a laser element.

[0071] It is not essential that 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 may be provided on a substrate separate from the light source substrate 110. The control unit may be disposed inside the housing 20 or outside the housing 20.

[0072] It is not essential that lighting fixture 10 be attached to ceiling 500 of a building. Lighting fixture 10 may be attached to a wall or a pillar installed inside or outside a building. The position of lighting fixture 10 (housing 20) when lighting fixture 10 is in use is not limited to the position shown in Fig. 7. For example, lighting fixture 10 may be attached to a pillar, a wall, or the like in a position in which optical axis L1 (see Fig. 2) of light source unit 120 faces upward.

[0073] 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. 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). Illumination 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.

[0074] The lens barrel 200 does not need to be entirely housed in the housing 20. For example, the front end (the end in the positive direction of the Y axis) of the lens barrel 200 may protrude further forward than the front end (the end in the positive direction of the Y axis) of the housing 20. It is not essential that the position of the lens barrel 200 in the front-rear direction can be adjusted. For example, the position of one or more lenses 260 held by the lens barrel 200 in the front-rear direction can be adjusted, thereby enabling focus adjustment of an image based on illumination light.

[0075] In the above embodiment, the second ventilation section 50 is described as an opening (see FIG. 2). However, it is possible to provide an insect screen (not shown) at the second ventilation section 50, even if the ventilation performance of the second ventilation section 50 is somewhat reduced. This prevents insects from straying into the housing 20 from the outside. As a result, the insects that have strayed into the housing 20 are prevented from adversely affecting the optical performance of the lighting device 10. In addition, during maintenance (repair, inspection, cleaning, etc.) of the lighting device 10, insects coming out from the inside of the housing 20 may surprise the worker, which may cause the worker to drop and damage parts such as lenses, and other such troubles are less likely to occur. The insect screen that has such an effect may be realized by a heat-resistant resin net or a metal net. As the insect screen, a decorative panel with ventilation holes and a design that looks good from the outside may be adopted. The insect screen may have a function of making it difficult to see the inside of the housing 20 from the outside of the housing 20.

[0076] In the present invention, by providing the cooling flow passage 60 inside the housing 20, an effect of improving the cooling effect on the gas inside the light source space 160 can be obtained. However, by providing the cooling flow passage 60 inside the housing 20, other effects may be obtained. For example, providing the cooling flow passage 60 inside the housing 20 also contributes to facilitating the disassembly work of the lighting device 10 when performing maintenance on the lighting device 10. This is because an empty space is created inside the housing 20 by the amount of the cooling flow passage 60, and therefore the lens barrel 200 and other members are no longer structured to be in close contact with the side wall portion 21, and as a result, the disassembly work becomes easier.

[0077] The above supplementary notes regarding lighting fixture 10 according to the embodiment may be appropriately applied to lighting fixtures 10a and 10b according to Modifications 1 and 2, respectively. In addition, the present invention also includes forms obtained by applying various modifications conceivable by a person skilled in the art to each of the embodiments and modifications, and forms realized by arbitrarily combining the components and functions of each of the embodiments and modifications without departing from the spirit of the present invention. In addition, the present invention also includes any combination of two or more claims among the multiple claims described in the claims at the time of filing of this application, within a range that does not cause technical contradiction. [Explanation of symbols]

[0078] 10, 10a, 10b Lighting fixtures 20. Cabinet 21 Side wall 22 Side 23 Inside 25, 25a, 25b rear wall 40, 40b First ventilation section 41, 41b through hole 50 Second ventilation section 60 Cooling Channel 80 Heat sink 100 Light emitting device 120 Light source section 130 Electric wire 150 Space formation part 151 Opening 160 Light source space 190 Connection parts 200 Lens barrel 211 Outer surface 260 Lens

Claims

1. A light emitting device having a light source unit that emits light forward; a heat sink connected to the light emitting device; a lens barrel for holding one or more lenses, the lens barrel being disposed in front of the light emitting device; a housing that houses the light emitting device, the heat sink, and the lens barrel, The housing includes: a cooling flow path through which gas in contact with the heat sink flows, the cooling flow path passing through a side of the light emitting device in a lateral direction perpendicular to the front-rear direction in the front-rear direction; a space forming portion that forms a light source space facing the light source portion and the lens barrel, the space forming portion has an opening portion that connects the inside of the light source space with the cooling flow path, and forms the light source space that is closed in a portion other than the opening portion; Lighting fixtures.

2. The housing has a side wall portion that forms a side surface in the lateral direction, The cooling flow path is formed along an inner surface of the side wall portion, the inner surface being a surface opposite to the side surface.

2. A lighting device according to claim 1.

3. the lens barrel has an outer circumferential surface facing the inner surface of the side wall portion, At least a portion of the cooling passage is formed between the inner surface and the outer circumferential surface.

3. A lighting device according to claim 2.

4. The housing includes: a first ventilation portion that connects one end of the cooling flow path to the outside of the housing; a second ventilation portion connecting the other end of the cooling flow path to the outside of the housing, A position of the first ventilation portion in the front-rear direction is rearward of a front end of the heat dissipation body, A position of the second ventilation portion in the front-rear direction is forward of the light source space. A lighting fixture according to any one of claims 1 to 3.

5. The first ventilation portion has one or more through holes formed in a rear wall portion that forms a rear end surface of the housing.

5. A lighting device according to claim 4.

6. the first ventilation portion has one or more through holes formed on one side in the lateral direction in a side wall portion that forms a side surface of the housing in the lateral direction, the cooling flow path extends along the heat sink from the first ventilation portion toward the other side in the lateral direction and passes through the side of the light emitting device on the other side in the lateral direction.

5. A lighting device according to claim 4.

7. Further, an electric wire connected to the light emitting device is provided, The electric wire passes through the opening and is drawn from the inside to the outside of the light source space. A lighting fixture according to any one of claims 1 to 3.

8. Further, a connection member for connecting the housing to a ceiling of a building is provided, When the housing is connected to the ceiling by the connection member, the opening is located lower than the light source in the up-down direction. A lighting fixture according to any one of claims 1 to 3.

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