Lighting device

Abstract

To provide an illuminating device that can restrain a temperature rise in a case.SOLUTION: An illuminating device 10 comprises a case 15, a light source 51, a power supply part 19, and a first vent 36. The light source 51 can move in a front direction that is a light irradiation direction a, and a rear direction opposite to the light irradiation direction a, in the case 15. The power supply part 19 is arranged at a position separated in the rear direction from a front end side of a lower surface part 25, on the lower surface part 25 of the case 15. The first vent 36 is provided between the front end side of the lower surface part 25 and the power supply part 19, in the lower surface part 25 of the case 15.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] Embodiments of the present invention relate to lighting devices.

Background Art

[0002] Conventionally, there is a lighting device in which a light source is attached to the rear side in the light irradiation direction inside a housing, a lens is attached to the front side in the light irradiation direction of the housing, and the light source or the lens can be moved in the front-rear direction. In this lighting device, ventilation holes are provided on the lower surface and the upper surface on the rear side of the housing where the light source is disposed. External air flows into the housing through the ventilation hole on the lower surface side, flows to the light source, passes through the light source, and is exhausted from the ventilation hole on the upper surface side to the outside of the housing, thereby suppressing a temperature rise inside the housing.

[0003] In such a lighting device, it is preferable that the temperature rise inside the housing is suppressed even when the light irradiation direction is directed downward.

Prior Art Documents

Patent Documents

[0007] According to the lighting device of this embodiment, it is expected that the temperature rise inside the housing can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a lighting device showing one embodiment, where (a) is a side view of the mounting member of the arm device in a first mounting state, and (b) is a side view of the mounting member of the arm device in a second mounting state. [Figure 2] This is a plan view of the same lighting device. [Figure 3] This is a rear view of the same lighting device. [Figure 4] This is a side view cross-sectional view of the same lighting device. [Figure 5] This is a plan view of the same lighting device with the top section removed. [Figure 6] This is a cross-sectional view of the same lighting device, with the light irradiation direction pointed downwards. [Modes for carrying out the invention]

[0009] One embodiment will be described below with reference to the drawings.

[0010] Figures 1 to 6 show the lighting device 10. The lighting device 10 is a spotlight that directs light onto a surface to be illuminated, for example, in a stage or studio. This lighting device 10 can also be used in locations where light is directed, for example, vertically or in directions of ±45° or less relative to the vertical.

[0011] The lighting device 10 comprises a lighting device body 11 that directs light in the light irradiation direction a, and an arm device 12 for suspending and supporting the lighting device body 11 from a support member, including a batten, installed on the ceiling side of a stage or studio.

[0012] The lighting device body 11 comprises a housing 15, a light source unit 16 that emits light in the light irradiation direction a, a moving mechanism 17 that moves the light source unit 16 in the forward direction, which is the light irradiation direction a, and in the backward direction, which is opposite to the light irradiation direction a, a projection lens 18 that projects light from the light source unit 16, and a power supply unit 19 that supplies lighting power to the light source unit 16. Hereafter, the direction toward the light irradiation direction a will be referred to as the forward direction or front, and the direction toward the opposite of the light irradiation direction a will be referred to as the backward direction or rear.

[0013] The housing 15 is formed in a rectangular parallelepiped shape that is elongated in the front-to-back direction along the light irradiation direction a. The housing 15 includes a front portion 21 facing the light irradiation direction a from which light is emitted, a rear portion 22 on the opposite side from the light irradiation direction a, an upper portion 23 surrounding the area between the front portion 21 and the rear portion 22, side portions 24 on both sides in the width direction which is the left-to-right direction, and a lower portion 25.

[0014] A circular illumination aperture 26 through which light passes is formed on the front portion 21 of the housing 15, and a cylindrical tube portion 27 protrudes forward surrounding this illumination aperture 26. A filter mounting portion 28 is attached to the front end of this tube portion 27, to which a filter such as a color filter can be detachably attached.

[0015] A handle 29 is attached to the rear surface 22 of the housing 15, corresponding to an intermediate vertical position between the top surface 23 and the bottom surface 25. The handle 29 is formed in a roughly U-shape and is attached along the width direction of the rear surface 22. The rear surface 22 also has a power cord 30 for receiving power from an external power source such as a commercial AC power supply, a power outlet 31 for sending external power to other lighting devices 10, connectors 32 and 33 for input and output of dimming signals, an operation panel 34 for setting, and an operation part (handle 75) for the moving mechanism 17.

[0016] The arm device 12 is attached to positions near the front ends of the side portions 24 on both sides of the housing 15.

[0017] A power supply unit 19 is disposed on the lower surface portion 25 of the housing 15 at positions spaced rearward from the front end side of the lower surface portion 25 and spaced forward from the rear end side of the lower surface portion 25. The power supply unit 19 is disposed, for example, at an intermediate position in the front - rear direction of the lower surface portion 25.

[0018] In the housing 15 configured as described above, in order to suppress a temperature rise inside the housing 15 in which the light source unit 16 that generates heat is accommodated, a plurality of ventilation openings are provided at multiple locations so that air circulates inside and outside the housing 15. By the flow of air circulating inside and outside the housing 15, the heat generated inside the housing 15 is discharged to the outside of the housing 15, thereby suppressing the temperature rise inside the housing 15.

[0019] A first ventilation opening 36 is provided on the lower surface portion 25 of the housing 15 between the front end side of the lower surface portion 25 and the front end side of the power supply unit 19. The first ventilation opening 36 is formed in a region having a length L1 in the front - rear direction in the side view shown in FIG.4 and is formed in a region at the center in the width direction of the housing 15 in the plan view shown in FIG.5. The length L1 is a length not exceeding the shortest distance from the front end of the power supply unit 19 to the front surface portion 21 (the length of the perpendicular line extended from the power supply unit 19 to the front surface portion 21).

[0020] A second ventilation opening 37 is provided on the upper surface portion 23 of the housing 15 at a position rearward of the first ventilation opening 36. Therefore, when the housing 15 is arranged such that the light irradiation direction a as shown in FIG.4 is in the horizontal direction, the first ventilation opening 36 and the second ventilation opening 37 do not overlap in the top view. The second ventilation opening 37 is formed in a region having a length L2 in the front - rear direction in the side view shown in FIG.4 and is formed in a region at the center in the width direction in the plan view shown in FIG.2.

[0021] On the lower surface portion 25 of the housing 15, a third vent 38 is provided between the rear end side of the lower surface portion 25 and the rear end side of the power supply unit 19. The third vent 38 is formed within a region facing the second vent 37. That is, at least a part of the second vent 37 and the third vent 38 overlap in a top view.

[0022] In the region of the lower surface portion 25 of the housing 15 where the power supply unit 19 is disposed, a fourth vent 39 is provided in the region from the rear end side of the power supply unit 19 to the middle position in the front-rear direction of the power supply unit 19. The fourth vent 39 communicates the inside of the housing 15 and the inside of the power supply unit 19. The fourth vent 39 may be provided (integrally) so as to connect to the third vent 38.

[0023] On the rear surface portion 22 of the housing 15, a fifth vent 40 is provided. The fifth vent 40 may be provided so as not to overlap with the handle 29 when the housing 15 is viewed from the rear (the direction in which the lighting device 10 is visible as in FIG. 3), or may be provided so as to overlap with the handle 29.

[0024] The first, second, third, and fifth vents 36, 37, 38, 40 are provided in a mesh structure on the plate material forming the housing 15 so that air can flow and fingers or objects cannot enter, or the vent area is entirely open and covered with another vent member having a mesh structure. The fourth vent 39 that communicates the housing 15 and the power supply unit 19 has its entire area open.

[0025] Inside the housing 15, a light shielding plate 42 is disposed opposite to the first vent 36 in order to prevent light leakage from the first vent 36 to the outside of the housing 15. The light shielding plate 42 is attached to the upper surface side of the lower surface portion 25 via a plurality of spacers 43, is disposed opposite to the first vent 36 so as to cover the upper part of the first vent 36, and is disposed with a gap between it and the lower surface portion 25 so that air can flow through the first vent 36.

[0026] Inside the housing 15, a light-shielding plate 44 is positioned opposite the second ventilation opening 37 to prevent light leakage from the second ventilation opening 37 to the outside of the housing 15. The light-shielding plate 44 is configured such that multiple light-shielding pieces are cut and bent at an angle, and air flows through the multiple openings formed by these cut pieces. It is attached to the lower side of the upper surface portion 23 via multiple spacers 45, and is positioned opposite the second ventilation opening 37 so as to cover the area below the second ventilation opening 37, while leaving a gap between it and the upper surface portion 23 to allow air to flow through the second ventilation opening 37. The light-shielding plate 44 may also be attached directly to the second ventilation opening 37 without the spacers 45.

[0027] Inside the housing 15, a light-shielding plate 46 is positioned opposite the third vent 38 and the fourth vent 39 to prevent light leakage to the outside of the housing 15 from the third vent 38 and the fourth vent 39. Although the fourth vent 39 does not directly open to the outside of the housing 15, it is preferable to provide a light-shielding plate 46 because there is a possibility of light leakage to the outside of the housing 15 through the side vent 84, which will be described later. The light-shielding plate 46 is configured such that multiple light-shielding pieces are cut and bent at an angle, and air flows through the multiple openings formed by these cut and bent pieces. It is attached to the upper side of the lower surface portion 25 via multiple spacers 47, and is positioned opposite the third vent 38 and the fourth vent 39 so as to cover the top of the third vent 38 and the fourth vent 39, while leaving a gap between it and the lower surface portion 25 so that air can flow through the third vent 38 and the fourth vent 39. The light-shielding plate 46 may also be directly attached to the third vent 38 and the fourth vent 39 without using the spacer 47.

[0028] The fifth vent 40 is located on the rear surface 22 opposite to the light irradiation direction a and is shielded by the light source unit 16, so no light-shielding member is provided. However, a light-shielding member may be provided if necessary.

[0029] Furthermore, the light source unit 16 includes a light source 51, a heat sink 52 on which the light source 51 is placed, a first light-shielding member 53, and a second light-shielding member 54.

[0030] The light source 51 may be a COB (Chip On Board) type light source module. In this light source module, multiple semiconductor light-emitting elements, or LEDs, are mounted on one side of a substrate and electrically connected by, for example, two wiring paths. A sealing resin containing phosphor is filled inside a ring-shaped enclosure frame that surrounds the multiple LEDs on one side of the substrate, and a circular light-emitting surface is formed on the surface of this sealing resin. For example, blue light from the LEDs excites the yellow phosphor, causing it to emit yellow light, and these lights are mixed to emit white light from the light-emitting surface.

[0031] The light source 51 may also be a light source module mounted on a substrate using multiple semiconductor light-emitting elements of, for example, SMD (Surface Mount Device) package type or CSP (Chip Scale Package) type.

[0032] The heat sink 52 comprises a metal base portion 56, a plurality of metal heat sinks 57 arranged in parallel and in contact with the rear surface of the base portion 56, and a plurality of heat pipes (not shown) for transferring heat from the base portion 56 to the plurality of heat sinks 57. The heat sink 52 may also be configured without heat pipes.

[0033] The substrate of the light source 51 is mounted on the front side of the base 56 so as to be in direct or indirect surface contact and thermally connected. Indirect contact here means that a heat dissipation sheet or thermal grease is interposed between the substrate of the light source 51 and the base 56.

[0034] Multiple heat sinks 57 are arranged side by side in the width direction of the housing 15, and gaps are formed between the multiple heat sinks 57 through which air can circulate.

[0035] The first light-shielding member 53 comprises a disc-shaped light-shielding plate portion 59 and a cylindrical light guide portion 60 provided in the center of the light-shielding plate portion 59. The light-shielding plate portion 59 is attached to the front side of the base portion 56 via a plurality of spacers 61. The light guide portion 60 protrudes cylindrically from the rear side of the light-shielding plate portion 59 toward the light source 51, with the opening at the rear end corresponding to the diameter of the light-emitting surface of the light source 51, and is provided to widen from the rear end toward the opening at the front end. The entire surface of the first light-shielding member 53 is formed in a matte black color to suppress light reflection.

[0036] The second light-shielding member 54 includes an annular mounting portion 62 attached to the front side of the base portion 56, a cylindrical light source cover portion 63 that covers the area around the light source 51 and the first light-shielding member 53 from the periphery of the mounting portion 62, an annular cover portion 64 extending outward from the front end of the light source cover portion 63, and a cylindrical cover portion 65 that protrudes forward from the periphery of the annular cover portion 64. The entire surface of the second light-shielding member 54 is formed in a matte black color to suppress light reflection.

[0037] Furthermore, the moving mechanism 17 includes a pair of shafts 71 and 72 positioned on both sides in the width direction at the bottom of the housing 15, such that their axial directions are parallel to the light irradiation direction a. One shaft 71 is a sliding feed shaft with a helical feed groove on its circumferential surface, and the other shaft 72 is a sliding shaft. The shafts 71 and 72 are supported by the housing 15 by a bearing member 73 at the front end and a bearing member 74 at the rear end. One shaft 71 is rotatably supported by the bearing members 73 and 74, with its rear end protruding from the rear surface portion 22, and a handle 75 for rotating the shaft 71 is attached to this rear end.

[0038] The front bearing member 73 is mounted on the upper side of the lower surface portion 25 of the housing 15, at a position behind the first vent 36. This bearing member 73 is attached to the lower surface portion 25 via side light-shielding plates 76 that are positioned on both sides in the width direction of the first vent 36. The side light-shielding plates 76 on both sides are spaced apart on both ends in the width direction of the light-shielding plate 42, which is positioned above the first vent 36.

[0039] A sliding member 77 is engaged with shafts 71 and 72 so as to be slidable in the axial direction. The sliding member 77 supports the heat sink 52 of the light source unit 16 and supports the light source unit 16 so as to be movable in the front-rear direction.

[0040] A sliding member 77 that engages with one of the shafts 71 has a feed member 78 attached to it that engages with the feed groove of the shaft 71. The feed member 78 has, for example, a pin protruding from the tip of a screw that is screwed into the sliding member 77, which engages with the feed groove of the shaft 71. When the shaft 71 is rotated by operating the handle 75, the feed member 78 is pushed axially at the edge of the feed groove of the shaft, and together with the sliding member 77, the light source unit 16 moves forward or backward.

[0041] The range of light irradiated onto the surface to be illuminated via the projection lens 18 can be adjusted by moving the light source unit 16 forward or backward using the movement mechanism 17.

[0042] For example, length L2 is longer than the distance from the rear surface 22 of the housing 15 to the frontmost side of the light source unit 16 (the front end of the cylindrical cover 65) when the light source unit 16 is moved to its furthest rearward position (the position of the light source unit 16 shown by the solid line in Figure 4). Conversely, length L2 is shorter than the distance from the rear surface 22 of the housing 15 to the frontmost side of the light source unit 16 (the front end of the cylindrical cover 65) when the light source unit 16 is moved to its furthest forward position (the position of the light source unit 16 shown by the dotted line in Figure 4, although some parts are omitted). Also, length L2 may be configured to be shorter than the distance from the rear surface 22 of the housing 15 to the front end of the heat sink 52 when the light source unit 16 is moved to its furthest forward position.

[0043] Furthermore, for example, when the light source unit 16 is moved to its furthest forward position, the light source unit 16 and the first vent 36 may be configured so that they do not overlap in a top view. This configuration makes it possible to prevent the light source unit 16 (especially the cylindrical cover portion 65) from obstructing the airflow from the first vent 36 to the other vents. In other words, it is possible to suppress the temperature rise inside the housing 15 regardless of the position of the light source unit 16.

[0044] Furthermore, the projection lens 18 is disposed within the cylindrical portion 27 of the housing 15 and projects the light-emitting surface of the light source 51 onto the surface to be illuminated. The projection lens 18 is an example of an optical component that optically controls the light emitted from the light source 51. For example, a convex lens, Fresnel lens, liquid crystal lens, diffuser, etc. may be used instead of the projection lens 18.

[0045] Furthermore, the power supply unit 19 is positioned at an intermediate location on the lower surface 25 of the housing 15, spaced rearward from the front end of the lower surface 25 and forward from the rear end of the lower surface 25.

[0046] The power supply unit 19 includes a power supply box 81 attached to the lower surface 25 of the housing 15, and a power supply board 82 located inside the power supply box 81.

[0047] The power supply box 81 has an open top, and at least a portion of the top is connected to a fourth ventilation opening 39 on the bottom 25 of the housing 15. Inside the power supply box 81, the upper rear area of ​​the power supply box 81 that is connected to the fourth ventilation opening 39 is partitioned by a partition plate 83. Side ventilation openings 84 are formed on both sides in the width direction of the area partitioned by the partition plate 83, and a rear ventilation opening 85 is formed on the rear side, and these side ventilation openings 84 and rear ventilation openings 85 are connected to the fourth ventilation opening 39 of the housing 15. The side ventilation openings 84 and rear ventilation openings 85 are provided in a mesh structure on the plate material forming the power supply box 81 to allow air to circulate and prevent fingers or objects from entering, or the ventilation area is open overall and covered with another ventilation member with a mesh structure.

[0048] Two power supply boards 82 are used, corresponding to the two wiring paths of the light source 51, and are arranged side by side in the front-to-back direction inside the power supply box 81. The power supply boards 82 convert the external power input through the power cord 30 into a predetermined lighting power and supply it to the light source 51, thereby lighting up the light source 51.

[0049] Furthermore, as shown in Figures 1 to 3, the arm device 12 includes an arm 90 that supports the lighting device body 11, which is the object to be supported; mounting members 91 that are attached to the side surfaces 24 on both sides of the housing 15 of the lighting device body 11; a connecting part 92 that rotatably connects the arm 90 to the mounting member 91; and a fixing mechanism 93.

[0050] The arm 90 is formed from a metal pipe and comprises a support section 95 and arm sections 96 bent from both ends of the support section 95. A suspension fitting 97 for suspending the arm from a structural member at the installation site is attached to the support section 95. A flat connecting plate section 98 is provided at the tip of the arm section 96, which is connected to a connecting section 92.

[0051] The mounting member 91 is made up of a rectangular plate and is mounted so that at least two sides are parallel to the light irradiation direction a. In other words, at least two sides of the mounting member 91 are mounted along a direction b that is perpendicular to the light irradiation direction a. The longitudinal direction is defined as direction b, and the mounting member 91 is mounted near the front end of the side portions 24 on both sides of the housing 15, with direction b facing in a direction that intersects the light irradiation direction a. The mounting member 91 is provided with multiple mounting holes, which are the mounting parts, and is attached to the side portions 24 of the housing 15 with screws 99 that pass through these mounting holes.

[0052] The mounting member 91 can be attached to the lighting device body 11 by changing its orientation around the center line c of the housing 15 (the line extending from the handle 29 towards the light irradiation direction a). The center line c is the center line of the light irradiation direction a of the lighting device body 11.

[0053] Specifically, as shown in Figure 1(a), the mounting member 91 is mounted with two sides parallel to the light irradiation direction a, such that one side, the first edge 91a, faces the upper surface 23 of the housing 15 and the other side, the second edge 91b, faces the lower surface 25. This is considered the first mounting state. As shown in Figure 1(b), the mounting member is mounted with the first edge 91a facing the lower surface 25 of the housing 15 and the second edge 91b facing the upper surface 23. This is considered the second mounting state.

[0054] The connecting portion 92 is positioned offset from the center of the mounting member 91 to one side in direction b. In Figures 1(a) and 1(b), the connecting portion 92 is positioned offset from the center of the mounting member 91 towards the second edge portion 91b. The connecting portion 92 is rotatably connected to the connecting plate portion 98 of the arm 90.

[0055] The fixing mechanism 93 rotatably supports the connecting plate portion 98 on one side of the arm 90 to the connecting portion 92 on one side of the housing 15, and can be fixed at any rotational position. The fixing mechanism 93 has a fixing handle 100, and when this fixing handle 100 is loosened, the angle of the light irradiation direction A of the lighting device body 11 relative to the arm 90 can be adjusted, and by rotating the fixing handle 100 in the tightening direction, the lighting device body 11 is fixed to the arm 90 at the angle adjusted position.

[0056] The connecting plate portion 98 on the other side of the arm 90 is rotatably connected to the connecting portion 92 on the other side of the housing 15 by a connecting mechanism using bolts.

[0057] Furthermore, when installing the lighting device 10, the installation conditions vary depending on the installation location, such as whether there are constraints on the distance between the suspension member from which the lighting device 10 is suspended and any obstacles below the suspension member, and the angle at which the light is projected. Such installation conditions can be easily addressed by switching between the first and second mounting states of the mounting member 91 of the arm device 12.

[0058] As shown in Figure 1(a), in the first mounting state of the mounting member 91, where the first edge 91a of the mounting member 91 is oriented toward the upper surface 23 side of the housing 15 and the second edge 91b is oriented toward the lower surface 25 side, and the connecting portion 92 is positioned toward the lower surface 25 side of the center line c, the distance between the pivot point of the lighting device body 11 relative to the arm 90 and the lower front end side of the lighting device body 11 (such as the lower front end side of the filter mounting portion 28) becomes shorter than in the second mounting state. Therefore, even if the angle of the lighting device body 11 is adjusted so that the light irradiation direction a is tilted downward, for example, to a vertical angle of 45 degrees or less, the lower front end side of the lighting device body 11 can be installed without interfering with obstacles below the installation site.

[0059] On the other hand, in the first mounting state, the distance between the support portion 95 of the arm 90 and the upper surface portion 23 of the lighting device body 11 becomes shorter, thus narrowing the range of rotation in which the angle of the lighting device body 11 relative to the arm 90 can be adjusted.

[0060] Furthermore, as shown in Figure 1(b), in the second mounting state of the mounting member 91, where the first edge 91a of the mounting member 91 is oriented toward the lower surface 25 side of the housing 15 and the second edge 91b is oriented toward the upper surface 23 side, and the connecting portion 92 is positioned toward the upper surface 23 side of the center line c, the distance between the support portion 95 side of the arm 90 and the upper surface 23 of the lighting device body 11 becomes longer, thus widening the range of rotation in which the angle of the lighting device body 11 relative to the arm 90 can be adjusted.

[0061] On the other hand, in the second mounting state, the distance between the pivot point of the lighting device body 11 relative to the arm 90 and the lower front end of the lighting device body 11 (the lower front end of the filter mounting section 28) becomes longer than in the first mounting state. Therefore, if the angle of the light irradiation direction a is adjusted to tilt downwards, for example, to a vertical angle of 45 degrees or less, the amount of downward protrusion will be greater compared to the first mounting state.

[0062] Thus, in the arm device 12, a connecting portion 92 is provided on one side of the center of the mounting member 91 in one direction b to connect the arm 90. Since the mounting member 91 is attached to the lighting device body 11 by changing the orientation of one direction b to the other, the first mounting state and the second mounting state can be arbitrarily selected by changing the orientation of the mounting member 91 in one direction b to the other, depending on the installation situation at the installation site. This allows for flexible adaptation to installation situations without having to prepare different lighting devices or arms 90 of different lengths.

[0063] Furthermore, the mounting member 91 can be attached to the lighting device body 11 by changing its orientation between one direction b and the other, with respect to the center line c that extends from the handle 29 of the housing 15 toward the light irradiation direction a. Therefore, in both the first and second mounting states, it is easy to install and adjust the angle by holding the handle 29, resulting in good workability.

[0064] Furthermore, as shown in Figure 6, when the lighting device body 11 is used with its angle adjusted so that the light irradiation direction a is tilted downwards, for example, at a vertical angle of 45 degrees or less, the ignition of the light source 51 causes the light source 51 to generate heat, and this heat is transferred to the light source unit 16, which includes the heat sink 52 and light shielding members 53, 54, etc., warming the air around the light source unit 16 and causing convection of air from bottom to top within the housing 15.

[0065] Due to the convection of air within the housing 15, air from outside the housing 15 is drawn into the housing 15 through a first vent 36 located on the lower side of the housing 15. This drawn-in air passes around the light source unit 16 inside the housing 15 and is exhausted outside the housing 15 through a second vent 37 located on the upper side of the housing 15. As a result, as shown by the dotted line in Figure 6, an air passage is formed inside the housing 15 from the first vent 36 to the second vent 37, and heat inside the housing 15 is dissipated. Therefore, when the housing 15 is tilted at an angle of 45 degrees with respect to the vertical, it is desirable that at least a portion of the first vent 36 and the second vent 37 overlap when viewed from above.

[0066] Furthermore, air is drawn into the housing 15 through the first vent 36 and exhausted to the outside of the housing 15 through the fifth vent 40 on the rear section 22. In addition, air is drawn into the housing 15 through the third vent 38 on the housing 15 and the fourth vent 39 through the side vents 84 on both sides of the power supply unit 19, and exhausted through the second vent 37 and the fifth vent 40.

[0067] If the housing 15 were not provided with the first ventilation opening 36, air would only be drawn into the housing 15 through the third ventilation opening 38 and the fourth ventilation opening 39, and therefore the heat inside the housing 15 would not be efficiently dissipated.

[0068] Furthermore, even when the light irradiation direction a of the lighting device body 11 is tilted to a near-horizontal position, for example, at a vertical angle of 45 degrees or more, a ventilation path is formed in which air is drawn in from the first ventilation opening 36 on the lower side and exhausted from the second ventilation opening 37 on the upper side, thereby dissipating heat from inside the housing 15.

[0069] Thus, in the lighting device 10, the power supply unit 19 is positioned at a location spaced rearward from the front end of the lower surface portion 25 of the housing 15, and a first vent 36 is provided between the front end of the lower surface portion 25 of the housing 15 and the front end of the power supply unit 19. Therefore, when the light irradiation direction a is directed downward, air can be drawn into the housing 15 through the first vent 36, which is located on the lower side of the housing 15. This airflow can then expel heat from inside the housing 15 to the outside, thereby suppressing the temperature rise inside the housing 15.

[0070] Since a second vent 37 is provided on the upper surface 23 of the housing 15 at a position behind the first vent 36, an air passage can be formed inside the housing 15 that allows air taken in from the first vent 36 to be exhausted from the second vent 37, which is located diagonally inside the housing 15. This allows heat from the light source unit 16 inside the housing 15 to be efficiently dissipated, and the temperature rise inside the housing 15 can be suppressed. Moreover, when the light source unit 16 is moved to its furthest rearward position, the light source 51 and the second vent 37 are positioned so that they overlap in a direction intersecting the light irradiation direction a. As a result, the heat source, the light source 51, is located in the aforementioned air passage, allowing heat from the light source 51 to be efficiently dissipated, and the temperature rise inside the housing 15 can be suppressed.

[0071] The device includes a moving mechanism 17 that moves the light source unit 16 in the front-rear direction along axes 71 and 72. However, since the bearing member 73 that supports the front end of axes 71 and 72 is positioned behind the first vent 36, it is possible to prevent the bearing member 73 from blocking the first vent 36 or obstructing the airflow.

[0072] In the arm device 12, in the first mounting state of the mounting member 91, the lighting device body 11 does not rotate by more than 90 degrees from the position where the light irradiation direction a intersects with the arm 90, so that the side of the lighting device body 11 opposite to the light irradiation direction a overlaps with the arm 90, and the lighting device body 11 abuts against the arm 90. However, in the second mounting state of the mounting member 91, the lighting device body 11 may be configured to rotate by more than 90 degrees from the position where the light irradiation direction a intersects with the arm 90, so that the side of the lighting device body 11 opposite to the light irradiation direction a overlaps with the arm. In this case, it is also possible to direct the light irradiation direction a of the lighting device body 11 straight down.

[0073] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0074] 10 Lighting devices 15 cabinets 17 Moving mechanism 19 Power supply section 25 Bottom part 36. First vent 37. Second vent 51 Light source 71, 72 axes 73 Bearing component a Light irradiation direction

Claims

1. The enclosure and; A light source that can move within the housing in the forward direction, which is the direction of light irradiation, and in the backward direction, which is opposite to the direction of light irradiation; A power supply unit is disposed on the lower surface of the aforementioned housing at a position spaced rearward from the front end of the lower surface; A first ventilation opening is provided on the lower surface of the housing between the front end of the lower surface and the power supply unit; Equipped with, When the light source is moved to its furthest forward position, the light source and the first vent are positioned so that they do not overlap when viewed from above. A lighting device characterized by the following features.

2. Housing and; A light source that can move within the housing in the forward direction, which is the direction of light irradiation, and in the backward direction, which is opposite to the direction of light irradiation; A power supply unit is disposed on the lower surface of the aforementioned housing at a position spaced rearward from the front end of the lower surface; A first ventilation opening is provided on the lower surface of the housing between the front end of the lower surface and the power supply unit; A moving mechanism comprising: a shaft that guides the forward and backward movement of the light source; and a bearing member disposed on the lower surface of the housing at a position rearward of the first vent, and bearing the front end of the shaft; A lighting device characterized by having the following features.

3. The housing is provided with a second vent located on the upper surface of the housing, positioned behind the first vent, and forming an air passage from the first vent within the housing. When the light source is moved to its furthest rearward position, the light source and the second vent are positioned to overlap when viewed from above. The lighting device according to claim 1 or 2, characterized by the features described above.

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