Lighting fixture

Abstract

To provide a lighting fixture which can provide longer life and can improve reliability.SOLUTION: A lighting fixture 10 according to the present invention has a housing body 12, a light source unit 13, a pump 16, a radiator 15, and a pipe 14. The light source unit 13 has a fitting member 30 having a plate-shaped part 34, a light source 31 disposed on one main surface of the plate-shaped part 34, and a lighting device 32 which is disposed on the other main surface 34b of the plate-shaped part 34 at a position not overlapping the light source 31 in the direction of thickness of the plate-shaped part 34 and which turns on the light source 31. The light source unit 13 is disposed inside the housing body 12 such that the one main surface side of the plate-shaped part 34 faces an opening 21. The pump 16 is disposed inside the housing body 12 and brought in contact with the other main surface 34b of the plate-shaped part 34. The radiator 15 is disposed outside of the housing body 12. The pipe 14 circulates cooling liquid, by an operation of the pump 16, between the pump 16 and the radiator 15.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE The present invention relates to a lighting fixture. [Background technology]

[0002] Conventionally, lighting fixtures that illuminate objects such as outdoor signs, or electric sterilizers that sterilize objects, are generally constructed to make the exterior of the fixture waterproof (instrument waterproof). In this structure, it is not easy to use a fan to exhaust the heat generated by components such as the light source and lighting device built into the fixture, so the heat generated inside the fixture is released to the outside via the fixture exterior using a heat dissipation member such as a heat sink or heat pipe.

[0003] In high-output devices such as floodlights, if the device does not dissipate heat sufficiently, the entire device will be heated uniformly, causing the light source, power supply, and other components to heat up and affecting their lifespan. Furthermore, if the device is used continuously with insufficient heat dissipation, the waterproofing materials such as packings may deteriorate, resulting in a decrease in waterproofing.

[0004] In addition, if a temperature difference occurs between the outside air and inside the appliance during use, there is a concern that condensation may occur inside the appliance, or that water may enter the appliance due to respiration when the appliance is repeatedly turned on and off. In addition, if a Peltier element is placed inside the appliance to directly cool the heat-generating part, condensation may occur in the cooling part.

[0005] Furthermore, apart from the structure for waterproofing the appliance, it is possible to make the internal parts waterproof (parts waterproof), but if the individual waterproof parts do not dissipate heat properly, there is a risk that the appliance will have a short lifespan. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-45619 A Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a lighting fixture that can achieve a longer life and improved reliability. [Means for solving the problem]

[0008] The lighting fixture of the embodiment includes a housing, a light source unit, a pump, a radiator, and piping. The housing has an opening and a light-transmitting cover covering the opening, and the inside is sealed liquid-tight. The light source unit includes an attachment member having a plate-shaped portion, a light source arranged on one main surface of the plate-shaped portion, and a lighting device arranged on the other main surface of the plate-shaped portion at a position not overlapping with the light source in the thickness direction of the plate-shaped portion and for turning on the light source, and is arranged inside the housing with the one main surface side of the plate-shaped portion as the opening side. The pump is arranged inside the housing in contact with the other main surface of the plate-shaped portion. The radiator is arranged outside the housing. The piping circulates the coolant between the pump and the radiator by the operation of the pump. Effect of the Invention

[0009] According to the lighting fixture of the embodiment, it is expected that the life span will be extended and the reliability will be improved. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are perspective views of a lighting fixture according to a first embodiment, in which (a) shows the lighting fixture from the front side and (b) shows the lighting fixture from the rear side with some parts omitted. [Diagram 2] FIG. 2A is a side view of the lighting fixture, and FIG. 2B is a rear view of the lighting fixture. [Diagram 3] FIG. 2 is a rear view of the light source unit of the lighting fixture. [Figure 4] FIG. 11 is a rear view of a light source unit of a lighting fixture according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the first embodiment will be described with reference to the drawings.

[0012] 1(a), 1(b), 2(a) and 2(b) show a lighting fixture 10. Examples of the lighting fixture 10 include a floodlight for illuminating an object such as an outdoor signboard, a canopy light for indoor / outdoor lighting, and an electric disinfectant for sterilizing and disinfecting an object.

[0013] Lighting fixture 10 includes housing 12, light source unit 13, piping 14, radiator 15, and pump 16. Lighting fixture 10 is a liquid-cooled (water-cooled) lighting fixture that configures a cooling device having piping 14, radiator 15, and pump 16, and performs cooling by circulating a coolant, such as cooling water, which is a refrigerant (coolant) for mainly cooling light source unit 13, between pump 16 and radiator 15 via piping 14.

[0014] The housing 12 is formed in a box shape with an internal space 20 defined therein. The housing 12 has an opening 21 which is a light exit opening on one side, and the other side opposite thereto is closed. The opening 21 is covered by a light-transmitting cover 22 such as a glass cover. In the following description, the opening 21 side will be referred to as the front side, and the opposite side will be referred to as the back side.

[0015] The housing 12 is made of any housing member and is capable of opening and closing the internal space 20. For example, the housing 12 has a housing main body 25 which is one housing member and a cover 26 which is another housing member. The housing main body 25 is cylindrical with an opening on the front side and a closed rear side by a rear part 27. The cover 26 is plate-like with an opening 21, and is attached to the housing main body 25 while covering the front side of the housing main body 25. Preferably, the housing 12 is a heat dissipation part in which the housing main body 25 and the cover 26 are formed of a material having excellent heat conductivity, such as a metal.

[0016] Housing 12 is a waterproof housing in which waterproof members (sealing members) such as packing are provided in each portion, such as the gap between housing main body 25 and cover 26 and the gap between opening 21 and translucent cover 22, and which can liquid-tightly seal internal space 20 to prevent water from entering. That is, lighting device 10 is a waterproof lighting device, and preferably a dustproof lighting device.

[0017] In this embodiment, the housing 12 is, for example, in the shape of a rectangular box. The opening 21 and the light-transmitting cover 22 are formed in a quadrilateral shape, such as a square shape, when viewed from the front.

[0018] In this embodiment, arms 28 are attached to both sides in the width direction of the housing 12. The arms 28 are attached to the housing main body 25, for example, by an adjustment screw. The arm 28 is installed in a predetermined installation location, and with the adjustment screw loosened, the angle of the housing 12, i.e., the direction of light irradiation from the light source unit 13, can be adjusted.

[0019] The light source unit 13 is housed in the internal space 20 of the housing 12. The light source unit 13 includes an attachment member 30, one or more light sources 31, and one or more lighting devices 32.

[0020] The mounting member 30 holds the light source 31 and the lighting device 32. Preferably, the mounting member 30 is made of a heat dissipation material that transmits and releases heat generated from the light source 31 and the lighting device 32. The mounting member 30 is formed of a material with excellent heat conductivity, such as metal. The mounting member 30 has a plate-shaped plate-shaped portion 34. The light source 31 is arranged in contact with one planar main surface 34a of the plate-shaped portion 34, and the lighting device 32 is arranged in contact with the other planar main surface 34b. The light source 31 and the lighting device 32 are thermally connected to the plate-shaped portion 34 of the mounting member 30. In the following, the term "thermally connected" means that they are in a positional relationship in close proximity or contact to the extent that heat conduction occurs, and does not mean that physical contact or connection is essential.

[0021] In this embodiment, the mounting member 30 further has a restricting portion 35 for restricting the position of the light source unit 13 in the internal space 20. The restricting portion 35 is formed in one or more on the plate-shaped portion 34. The restricting portion 35 extends from the other main surface 34b of the plate-shaped portion 34 in the thickness direction of the plate-shaped portion 34, i.e., in the plate thickness direction, and the tip portion of the restricting portion 35 abuts against the back portion 27 of the housing main body portion 25 of the housing 12, thereby supporting the light source unit 13 against the back portion 27 of the housing 12 and restricting the light source unit 13 to a position at a predetermined distance in the front direction from the back portion 27. In other words, the light source unit 13 is disposed in the internal space 20 with the one main surface 34a side of the plate-shaped portion 34 being the opening 21 side, i.e., the front side.

[0022] In the illustrated example, the plate-shaped portion 34 of the mounting member 30 is formed in a quadrangular shape such as a square shape, and the restricting portions 35 are formed at the four corners of the plate-shaped portion 34, respectively.

[0023] The light source 31 is a module equipped with a discharge lamp or an LED. As the light source 31, for example, an LED lamp or LED module with a dominant wavelength of 380 to 700 nm used for normal lighting, a germicidal lamp with a dominant wavelength of 254 nm, an ultraviolet LED module with a dominant wavelength of 100 to 384 nm, or an ultraviolet lamp (excimer lamp) with a dominant wavelength of 222 nm is suitably used. The light source 31 is positioned facing the opening 21 of the housing 12 and faces the light-transmitting cover 22.

[0024] The lighting device 32 is a circuit section that lights the light source 31. The lighting device 32 is an inverter section that rectifies and smoothes an input external power source, for example, a commercial AC power source, converts it into a predetermined DC power source, and supplies it to the light source 31. The external power source input to the lighting device 32 passes through, for example, a terminal block 37. The terminal block 37 is disposed, for example, in the internal space 20 of the housing 12. In this embodiment, the terminal block 37 is attached to the rear portion 27 of the housing main body 25, and is electrically connected to the lighting device 32 by a wiring 38. The terminal block 37 is connected to the external power source through a wiring hole portion 39 formed in the housing 12. The wiring hole portion 39 is formed, for example, in the rear portion 27 of the housing main body 25. The gap between the wiring 38 inserted into the wiring hole portion 39 and the wiring hole portion 39 is liquid-tightly sealed by a waterproof member such as a packing.

[0025] The lighting device 32 and the light source 31 are electrically connected by a wiring 40. The wiring 40 is inserted into a hole 41 formed in the plate-shaped portion 34 of the mounting member 30 near the light source 31, thereby electrically connecting the lighting device 32 located on the other main surface 34b of the mounting member 30 and the light source 31 located on the one main surface 34a of the mounting member 30.

[0026] In the light source unit 13, the light source 31 and the lighting device 32 are located at positions where they do not overlap each other in the thickness direction of the plate-shaped portion 34, that is, in the front and back directions. For example, in this embodiment, a plurality of light sources 31 are arranged, and a lighting device 32 is arranged for each of the light sources 31. For example, four light sources 31 and four lighting devices 32 are arranged. The positions where the light sources 31 and the lighting devices 32 do not overlap each other in the thickness direction of the plate-shaped portion 34 may be set arbitrarily, but in the example shown in FIG. 3, the light sources 31 are arranged at positions between the center and each side of the plate-shaped portion 34, evenly or approximately evenly from the center, and surround the pump 16 at the center of the plate-shaped portion 34 when viewed from the back side, and the lighting devices 32 are arranged at positions sandwiching each light source 31, that is, at positions opposite each other with respect to each light source 31 as a reference.

[0027] As shown in FIG. 2(a), the piping 14 connects the pump 16 and the radiator 15. A part of the piping 14 is disposed in the internal space 20 of the housing 12, and the remaining part is led out from the housing 12 and connected to the radiator 15. The piping 14 is located in the internal space 20 of the housing 12 on the other main surface 34b side of the plate-shaped part 34 of the mounting member 30 of the light source unit 13, that is, on the back side of the light source unit 13, and is adapted to recover heat from the lighting device 32 directly and indirectly from the mounting member 30, and heat from the light source 31 indirectly from the mounting member 30, to the cooling water. The piping 14 is made of a material having excellent heat conductivity, and for example, a rubber hose or a metal pipe is preferably used.

[0028] Of the piping 14, the arrangement of the piping 43 inside the housing located in the internal space 20 of the housing 12 may be set arbitrarily as long as it can efficiently absorb heat from the light source unit 13. As shown in FIG. 3, of the piping 43 inside the housing of the piping 14, the first portion 43a through which the cooling water passes from the radiator 15 (shown in FIG. 2(a) and the like) to the pump 16 mainly constitutes a heat absorption portion, is in close proximity to or in contact with the heat source of the light source unit 13, and is preferably located in a position overlapping the light source 31 and / or the lighting device 32 in the front-rear direction. That is, the first portion 43a is thermally connected to the light source unit 13 (the mounting member 30, the light source 31, and / or the lighting device 32). Also, of the piping 43 inside the housing of the piping 14, the second portion 43b through which the cooling water passes from the pump 16 to the radiator 15 (shown in FIG. 2(a) and the like) mainly constitutes a heat exhaust portion, and is located in close proximity to or in contact with the housing 12, which is a heat dissipation portion. That is, the second portion 43b is thermally connected to the housing 12.

[0029] In the example shown in FIG. 3, at least a part of the piping 43 in the housing of the piping 14 faces the lighting device 32 and is positioned so as to overlap in the front-rear direction. Preferably, the first portion 43a faces the lighting device 32 and is positioned so as to overlap in the front-rear direction. The first portion 43a is at least close to the lighting device 32, and may be in contact with the lighting device 32. In the example shown in the figure, the first portion 43a goes around the lighting devices 32 from the lighting device 32 at the lower right in the figure to the lighting devices 32 at the lower left, upper left, and upper right, facing the vicinity of the center of each lighting device 32, then turns back at the position of the lighting device 32 at the upper right, passes through the lighting device 32 at the upper left, and is connected to the pump 16 from between the lighting devices 32 at the upper left and lower left. The second portion 43b passes in a straight line from the pump 16 between the lighting devices 32 at the upper right and lower right, and is positioned so as to be close to or in contact with the side portion of the housing 12. Therefore, in the case of this arrangement, the piping 43 in the housing passes through a position overlapping all the lighting devices 32 and all the light sources 31 positioned between the lighting devices 32 in the front-rear direction.

[0030] As shown in Figs. 2(a) and 2(b), the housing external pipe 45 of the pipe 14 communicates with the first part 43a and the second part 43b (shown in Fig. 3) of the housing internal pipe 43 through the pipe hole 46 formed in the housing 12. The pipe hole 46 is formed, for example, in the rear part 27 of the housing 12. The gap between the pipe hole 46 and the pipe 14 is liquid-tightly sealed by a waterproof member such as a packing. The housing external pipe 45 has a first part 45a communicating with the first part 43a (shown in Fig. 3) of the housing internal pipe 43 and a second part 45b communicating with the second part 43b (shown in Fig. 3) of the housing internal pipe 43. The first part 45a and the second part 45b are connected to one side and the other side of the radiator 15. The first portion 45a is a side where the coolant is discharged from the radiator 15, and the second portion 45b is a side where the coolant is collected into the radiator 15.

[0031] Radiator 15, which is a heat exchanger, is integrally formed with a plurality of thin tubes through which cooling water passes and fins that assist heat dissipation from the thin tubes, and has tank parts formed connected to one end and the other end of the thin tubes. A first part 45a of external piping 45 of piping 14 is connected to one tank part, and a second part 45b of external piping 45 of piping 14 is connected to the other tank part. Radiator 15 is formed of a material with excellent heat conductivity, such as metal.

[0032] The radiator 15 is located at a position spaced apart from the housing 12. In this embodiment, the radiator 15 is supported at a position spaced apart from the housing 12 by a support portion 47. Preferably, the support portion 47 mechanically connects the radiator 15 and the housing 12 in a thermally insulated state. The radiator 15 may be located at any position with respect to the housing 12, but in this embodiment, for example, the radiator 15 is connected to the rear portion 27 of the housing 12 and is located on the rear side of the housing 12. In this embodiment, the radiator 15 is formed in a rectangular shape when viewed from the front, and the four corners of the radiator 15 are connected to the rear portion 27 of the housing 12 by the support portions 47. A space portion 48 is formed between the rear portion 27 of the housing 12 and the radiator 15. In this embodiment, the space portion 48 is larger than the thickness of the radiator 15 in the front-to-rear direction.

[0033] Radiator 15 may include a cooling fan for improving heat dissipation. The cooling fan is, for example, a waterproof fan. For example, the cooling fan may be at least partially disposed in space 48 and may blow cooling air to radiator 15 from the housing 12 side in a direction away from housing 12 (direction indicated by arrow X1), or may blow cooling air from the opposite side to housing 12, that is, from the opposite side to space 48 with radiator 15 as a reference, toward housing 12 (direction indicated by arrow X2).

[0034] The pump 16, which circulates the cooling water through the radiator 15 via the piping 14, is disposed in the internal space 20 of the housing 12. The pump 16 is located in contact with the other main surface 34b of the plate-shaped portion 34 of the mounting member 30 of the light source unit 13, and is thermally connected to the plate-shaped portion 34 of the mounting member 30. The pump 16 may be disposed at any position that does not interfere with the lighting devices 32, but in this embodiment, as shown in FIG. 1(b), the pump 16 is disposed at the center of the plate-shaped portion 34, evenly or approximately evenly spaced apart from the multiple lighting devices 32. Also, in this embodiment, as shown in FIG. 3, the pump 16 is located close to the light source 31 and does not overlap in the front-rear direction. Therefore, in the illustrated example, the pump 16 is thermally connected to the light source unit 13 (the mounting member 30, the light source 31, and / or the lighting device 32).

[0035] The operation of the pump 16 is controlled by a control unit 50 shown in FIG. 1(b). The control unit 50 may be located inside or outside the housing 12, but in this embodiment, it is located in the internal space 20 of the housing 12 between the terminal block 37 and the pump 16. The control unit 50 may include a temperature detection unit 51. The temperature detection unit 51 is, for example, a temperature sensor, a thermistor, or the like, and detects at least one of the temperatures of the mounting member 30, the light source 31 (shown in FIG. 1(a)), the lighting device 32, or the like, that is, the temperature of the light source unit 13, and / or the temperature of the internal space 20. The control unit 50 variably controls the rotation speed of the pump 16 according to the temperature detected by the temperature detection unit 51. That is, the control unit 50 controls the rotation speed of the pump 16 to be increased according to an increase in the temperature detected by the temperature detection unit 51.

[0036] In the lighting fixture 10, power from an external power source is supplied to the lighting device 32 via the terminal block 37, and the lighting device 32 turns on the light source 31. The light emitted from the light source 31 is emitted from the opening 21 through the light-transmitting cover 22.

[0037] Heat generated by the light emission of light source 31 and the operation of lighting device 32 is radiated into internal space 20 of housing 12 and is also transferred to mounting member 30 and housing 12. Control unit 50 operates pump 16 to circulate cooling water between radiator 15 and lighting fixture 10 via piping 14, thereby cooling lighting fixture 10.

[0038] Specifically, in the piping 14, the heat generated from the light source unit 13 and / or the heat of the internal space 20 is recovered in the internal piping 43 into the cooling water passing through the inside, and the pump 16 recovers the heat generated from the light source 31 and the heat generated from the lighting device 32 into the cooling water. Then, the cooling water that has absorbed heat flows to the radiator 15 outside the housing 12 through the external piping 45 by the operation of the pump 16, whereby heat exchange occurs in the radiator 15, and the heat is released to the outside of the housing 12 by this heat exchange, and the cooling water is cooled. The cooling water that has been cooled again circulates from the external piping 45 to the inside of the housing 12 through the internal piping 43 to the pump 16.

[0039] In this way, in the light source unit 13, the light source 31 is disposed on one main surface 34a of the plate-shaped portion 34 of the mounting member 30, the lighting device 32 is disposed on the other main surface 34b of the plate-shaped portion 34, and these are disposed in positions that do not overlap in the front-to-back direction, which is the thickness direction of the plate-shaped portion 34, so that heat generated from the light source 31 and the lighting device 32 can be evenly dispersed in the plate-shaped portion 34. Therefore, the pump 16, which is located inside the housing 12 and in contact with the other main surface 34b of the plate-shaped portion 34 of the light source unit 13, is connected to the radiator 15, which is located outside the housing 12, by the piping 14, and cooling water is circulated between the pump 16 and the radiator 15, so that the heat generated inside the housing 12 by the light source unit 13 can be efficiently discharged to the outside of the housing 12.

[0040] Since the temperature inside the housing 12 of the lighting fixture 10 during use can be kept low, the thermal deterioration of the light source 31 and the lighting device 32 can be suppressed to extend their lifespan, and thus the lifespan of the lighting fixture 10 can be extended. In addition, the thermal deterioration of waterproofing members such as the packing that seals the inside of the housing 12 liquid-tightly can also be suppressed to extend their lifespan, so that the waterproof performance can be maintained for a long time. Furthermore, since the temperature difference between the inside of the housing 12 of the lighting fixture 10 and the outside air can be reduced, condensation during use can be suppressed, and there is no sudden drop in temperature even after use, so that the intrusion of water into the housing 12 from the outside due to respiration caused by repeated on-off can also be suppressed. In other words, the waterproofing of the lighting fixture 10 can be ensured, and even in the case of a high-output lighting fixture 10, the lifespan can be extended and the reliability can be improved without increasing the size of the fixture.

[0041] A part of the piping 14, in this embodiment the piping 43 inside the housing, is positioned so that it overlaps with at least one of the light source 31 and the lighting device 32 in the front-to-back direction, which is the thickness direction of the plate-shaped portion 34, inside the housing 12, and is thermally connected to at least one of the light source 31 and the lighting device 32. This allows the heat generated from the light source 31 and / or the lighting device 32 to be efficiently recovered into the cooling water via the piping 43 inside the housing, and the temperature of the light source 31 and / or the lighting device 32 to be efficiently lowered.

[0042] In particular, by placing the piping inside the housing 43 close to or in contact with the lighting device 32, the heat generated by the lighting device 32 can be more efficiently collected into the cooling water via the piping inside the housing 43.

[0043] Furthermore, the first portion 43a of the piping 43 inside the housing, which sends cooling water from the radiator 15 to the pump 16, is positioned inside the housing 12 so as to overlap at least one of the light source 31 and the lighting device 32 in the front-to-rear direction, so that the temperature of the light source 31 and / or the lighting device 32 can be efficiently lowered using the cooling water that has just been cooled by the radiator 15.

[0044] In addition, the second portion 43b of the piping 43 inside the housing, which sends cooling water from the pump 16 to the radiator 15, is positioned close to or in contact with the housing 12, so that the housing 12 can also be used for heat dissipation, and the lighting fixture 10 can be cooled more efficiently.

[0045] Furthermore, by arranging the pump 16 in a position close to each lighting device 32, the heat generated from the lighting device 32 can be recovered into the cooling water even at the position of the pump 16, and the temperature of the light source 31 can be efficiently lowered.

[0046] Similarly, by positioning the pump 16 in a position close to the light source 31 in the front-to-back direction, which is the thickness direction of the plate-shaped portion 34, i.e., in a position close to the back side of the light source 31, the heat generated from the light source 31 can be recovered into the cooling water even at the position of the pump 16, and the temperature of the light source 31 can be efficiently lowered.

[0047] In this embodiment, the pump 16 is positioned evenly or approximately evenly relative to the multiple light sources 31 and the multiple lighting devices 32, so that the heat generated from each light source 31 and each lighting device 32 can be collected evenly at the position of the pump 16.

[0048] Since the radiator 15 is located at a position separated from the housing 12, it is possible to prevent the cooling effect of the radiator 15 from being impaired by the heat dissipation from the housing 12 to which the heat generated by the light source unit 13 is transferred.

[0049] In addition, when a cooling fan is used for radiator 15, the cooling effect of radiator 15 can be further improved. When the cooling fan blows cooling air toward the back of radiator 15, that is, in the direction from space 48 between radiator 15 and housing 12 toward radiator 15 (the direction of arrow X1 in FIG. 2(a)), the space of space 48 can be effectively used for arranging the cooling fan, making it possible to configure lighting device 10 compact, and when the cooling air is blown toward the front of radiator 15, that is, in the direction from the back side of radiator 15 toward housing 12 (the direction of arrow X2 in FIG. 2(a)), the cooling air can also act on the surface of housing 12, thereby cooling the surface of housing 12, thereby further improving the heat dissipation effect.

[0050] In addition, by controlling the rotation speed of pump 16 by control unit 50 in response to the temperature detected by temperature detection unit 51, each part of lighting fixture 10 can be cooled more effectively and kept at an appropriate temperature.

[0051] Next, a second embodiment is shown in Fig. 4. Note that the same components as those in the first embodiment are given the same reference numerals, and the description of the components and their functions and effects will be omitted.

[0052] In the present embodiment, in the light source unit 13, the light sources 31 are located within a predetermined region A close to the center of the plate-shaped portion 34 of the mounting member 30, and are evenly or approximately evenly arranged around the pump 16 in the center of the plate-shaped portion 34 when viewed from the rear side. Also, in the light source unit 13, the lighting device 32 is arranged outside the region A of the plate-shaped portion 34 of the mounting member 30. In the illustrated example, the lighting device 32 is arranged near the outer edge of the plate-shaped portion 34, for example, close to the four corners of the plate-shaped portion 34.

[0053] Also, the piping 43 in the housing of the piping 14 is at a position where at least a part overlaps with the light source 31 in the front-rear direction. Preferably, the first part 43a is at a position where it overlaps with the light source 31 in the front-rear direction. The first part 43a is at least close to the other main surface 34a of the plate-shaped part 34 of the mounting member 30, and may be in contact with it. In the illustrated example, the first part 43a is arranged in a spiral or helical shape so as to go around the rear side positions of the multiple light sources 31 in the region A from the outside of the region A, and is connected to the pump 16. Also, the second part 43b is arranged along the side part of the housing 12, passing between the lighting devices 32 at the upper right and lower right in the figure from the pump 16 to the outside of the region A. Therefore, in this arrangement, the piping 43 in the housing passes through a position where it overlaps with all the light sources 31 in the front-rear direction, and does not face the lighting devices 32, that is, does not overlap with the front-rear direction. The piping inside the housing 43 is thermally connected to the light source unit 13 (the mounting member 30 and / or the light source 31).

[0054] Therefore, the heat generated from the light source 31 can be efficiently collected into the cooling water via the piping 43 inside the housing, and the temperature of the light source 31 can be efficiently lowered.

[0055] Furthermore, the first portion 43a of the piping 43 inside the housing, which sends cooling water from the radiator 15 to the pump 16, is positioned inside the housing 12 so as to overlap the light source 31 in the front-to-rear direction, so that the temperature of the light source 31 can be efficiently lowered using the cooling water that has just been cooled by the radiator 15.

[0056] Furthermore, the pump 16 is positioned so as to at least partially overlap the light source 31 in the front-rear direction. Therefore, heat generated from the light source 31 can be efficiently collected into the cooling water at the position of the pump 16. In particular, since the light sources 31 are arranged close together in the area A, heat is efficiently drawn into the cooling water at the position of the pump 16.

[0057] Furthermore, since the lighting device 32 is positioned near the outer edge of the plate-shaped portion 34 of the mounting member 30, heat can be dissipated directly or via the mounting member 30 to the housing 12 which is in close proximity to or in contact with the outer edge of the plate-shaped portion 34.

[0058] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0059] 10 Lighting equipment 12. Cabinet 13 Light source unit 14 Piping 15 Radiator 16 Pump 21 Opening 22 Translucent cover 30 Mounting material 31 Light source 32 Lighting device 34 Plate-shaped part 34a One principal surface 34b Other main surface

Claims

1. a housing having an opening and a light-transmitting cover that covers the opening, the inside of which is sealed liquid-tight; a light source unit including a mounting member having a plate-shaped portion, a light source arranged on one main surface of the plate-shaped portion, and a lighting device arranged on the other main surface of the plate-shaped portion at a position not overlapping with the light source in a thickness direction of the plate-shaped portion and configured to light the light source, the light source unit being arranged inside the housing with the one main surface side of the plate-shaped portion being the opening side; a pump disposed inside the housing in contact with the other main surface of the plate-shaped portion; A radiator disposed outside the housing; a pipe for circulating a coolant between the pump and the radiator by operation of the pump; A lighting fixture comprising:

2. A portion of the pipe is located inside the housing and thermally connected to at least one of the light source and the lighting device.

2. The lighting device according to claim 1.

3. The radiator is located at a position spaced apart from the housing.

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

Images