JP2015097187A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device suppressing a temperature rise of a light emission part.SOLUTION: The lighting device includes: a cylindrical housing 10 having an opening part 11a; a plate-like base table 20 arranged so as to cover the opening part 11a with a lid; a light emission part 32 placed on one surface of the base table 20; and a cooling fan 40. Ventilation holes 12a and 20a through which the inside and the outside of the housing 10 are communicated with each other are formed on the housing 10 and the base table 20, respectively. The cooling fan 40 is disposed so as to flow the air inside the housing 10 in a direction toward one of the ventilation hole 12a of the housing 10 and the ventilation hole 20a of the base table 20 to the other direction, and to the same direction as that of the natural convection current.

Description

  The present invention relates to a lighting device.

  Solid light-emitting elements such as light emitting diodes (LEDs) are expected to serve as light sources for various products because of their small size, high efficiency, and long life. Among them, in recent years, research and development of LED lighting devices using LEDs have been promoted.

  For example, Patent Document 1 discloses an HID type LED lighting apparatus that replaces an existing HID (High Intensity Discharge) lamp. The HID type lighting device is used by being attached to a ceiling surface of a gymnasium, a factory, a warehouse, or the like, for example.

JP2012-14900A

  The HID type lighting device includes, for example, a cylindrical casing, a base attached to the casing, and an LED module disposed on the base, and is configured to irradiate the floor surface. Yes. An LED is used for the light emitting part of the LED module. The light emitting part has a problem that the temperature rises due to heat generated when the LED is turned on. For example, the temperature of the LED rises due to the heat generated by the LED itself, the light output decreases, and the lifetime is shortened.

  Therefore, in the HID type lighting device, by providing air holes in the upper and lower parts of the housing, the air in the housing is naturally convected through the air holes, and the heat generated in the light emitting part is outside the housing. Conducting. Thereby, the temperature rise of the light emission part is suppressed.

  However, the HID type lighting device has a high wattage and is required to further improve the light emission efficiency. However, it is not possible to sufficiently suppress the temperature rise of the light emitting unit only by heat radiation by natural convection.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an illuminating device capable of suppressing a temperature rise of a light emitting unit.

  In order to achieve the above object, one aspect of a lighting device according to the present invention includes a cylindrical housing having an opening, a plate-like base arranged to cover the opening, A light emitting unit disposed on one surface of the base and a cooling fan, each of the casing and the base is provided with a vent hole that communicates the inside and outside of the casing; The cooling fan is a direction in which the air in the casing is directed from one of the vent hole of the casing and the vent hole of the base to the other, and the same direction as the direction of natural convection in the casing It is arrange | positioned so that it may flow through.

  Moreover, the aspect of the lighting device according to the present invention may be configured such that the cooling fan is disposed in the vicinity of the base.

  Further, in one aspect of the lighting device according to the present invention, when the lighting device is attached to a ceiling surface, the opening is positioned at a lower portion of the housing, and the vent hole provided in the housing is formed of the housing. It may be provided on the upper part of the body.

  Moreover, the aspect of the lighting device according to the present invention may be configured such that the vent hole provided in the housing is provided in a top surface portion of the housing.

  Further, in one embodiment of the lighting device according to the present invention, a plurality of air holes provided in the housing may be provided in a radial manner.

  In the lighting device according to the aspect of the invention, the cooling fan may be provided in a lower portion of the casing, and air in the casing may be transferred from the vent hole of the base to the vent hole of the casing. It is good also as blowing in the direction which goes to.

  In the lighting device according to the aspect of the present invention, the lighting device may further include a cover that is disposed above the housing at a distance from the housing and covers the vent hole of the housing. .

  In the aspect of the lighting device according to the present invention, the cooling fan may be provided in the housing.

  Moreover, one aspect | mode of the illuminating device which concerns on this invention WHEREIN: The ventilation hole provided in the said base is good also as being provided with two or more cyclically | annularly in the peripheral part of the said base.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: Furthermore, it is good also as providing the heat sink connected to the other surface of the said base, and arrange | positioned in the said housing | casing.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: The said heat sink is good also as having several radiation fin extended in the cylinder axis direction of the said housing | casing.

  Moreover, in one aspect of the lighting device according to the present invention, the lighting device further includes a support pipe extending from the inside of the housing toward the outside, and the base is connected to one end of the support pipe. It is good.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: Furthermore, it is good also as providing the attachment member connected to the other end of the said support pipe.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: The driving sound level of the said cooling fan is good also as 20 dB or less.

  According to the present invention, since the heat generated in the light emitting part can be efficiently radiated, the temperature rise of the light emitting part can be effectively suppressed as compared with the case where heat is radiated only by natural air cooling.

It is an external appearance perspective view when the illuminating device which concerns on embodiment of this invention is seen from diagonally downward. It is an external appearance perspective view when the illuminating device which concerns on embodiment of this invention is seen from diagonally upward. It is a disassembled perspective view which shows the internal structure of the illuminating device which concerns on embodiment of this invention. It is sectional drawing when the illuminating device which concerns on embodiment of this invention is seen from diagonally upward. It is a partial cross-sectional view of the illumination device according to the embodiment of the present invention. It is a top view when the illuminating device which concerns on embodiment of this invention is seen from the front side of a Z-axis direction. FIG. 6A is a plan view when seen through the reflector and the front cover in FIG. 6A. It is a figure which shows a some installation pattern when a cooling fan is installed in an illuminating device. It is a figure which shows a some installation pattern when a cooling fan is installed in an illuminating device. It is a figure which shows the measurement result of chip | tip temperature Tj, a front cover temperature, and a reflector temperature in the case of natural air cooling and the case of the some installation pattern of FIG.7 and FIG.8.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, each of the embodiments described below shows a preferred specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps (steps) and order of steps, and the like shown in the following embodiments are examples and limit the present invention. It is not the purpose to do. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
First, the whole structure of the illuminating device 1 which concerns on embodiment of this invention is demonstrated using FIGS.

  FIG. 1 is an external perspective view of an illuminating device 1 according to an embodiment of the present invention as viewed obliquely from below. FIG. 2 is an external perspective view of the illumination device 1 as viewed obliquely from above. FIG. 3 is an exploded perspective view showing the internal configuration of the illumination device 1. 4 is a cross-sectional view of the illuminating device 1 when viewed obliquely from above, and FIG. 5 is a partial cross-sectional view of the illuminating device 1. As shown in FIG.

  1 to 5, the Z-axis direction is the vertical direction, the direction indicated by the Z-axis arrow is downward (front), and the opposite direction is upward (rear). In FIG. 3, screws are omitted.

  Illuminating device 1 according to the present embodiment is an illuminating device that replaces an HID lamp, and is used by being attached to an attachment surface (high ceiling surface or the like) of a construction material such as a gymnasium, a factory, or a warehouse. In this case, the illuminating device 1 emits light mainly downward so as to irradiate the front surface (floor surface or the like).

  As illustrated in FIGS. 1 to 5, the lighting device 1 includes a housing 10, a base 20, an LED module 30, and a cooling fan 40. Furthermore, the lighting device 1 includes a heat sink 50, a support pipe 60, a cover 70, a mounting member 80, a reflector 91, and a front cover 92.

  In the present embodiment, each of the housing 10 and the base 20 is provided with vent holes 12a and 20a communicating with the inside and outside of the housing 10. Further, the cooling fan 40 causes the air in the housing 10 to flow in one direction from one of the ventilation holes 12 a of the housing 10 and the ventilation holes 20 a of the base 20 to the other, and natural convection in the housing 10. It is arranged to flow in the same direction as

  Hereinafter, the detailed structure of each member of the illuminating device 1 which concerns on embodiment of this invention is demonstrated, referring FIGS.

[Case]
As shown in FIGS. 1-5, the housing | casing 10 is a cylindrical case which has the opening part 11a. In the present embodiment, the casing 10 has a bottomed cylindrical shape, and closes the cylindrical tubular portion 11 extending rearward from the outer edge of the base 20 and the opening on the rear end side of the tubular portion 11. And a top plate portion 12 which is a bottom portion.

  As shown in FIGS. 4 and 5, the cylindrical portion 11 is configured to surround the heat sink 50. In this Embodiment, the cylindrical part 11 is formed so that an internal diameter and an outer diameter may expand gradually toward the downward direction. In addition, the front end of the opening part 11a of the cylindrical part 11 is opening. That is, the base 20 is disposed at a position retracted from the opening at the front end of the cylindrical portion 11. The opening diameter of the front end of the cylindrical portion 11 is equal to the diameter of the base 20.

  Further, when the lighting device 1 is attached to a ceiling surface or the like, the opening 11a is positioned in a lower part (lower part) of the housing 10. That is, the base 20 is disposed at the lower part of the housing 10.

  The top plate portion 12 that is the top surface portion of the housing 10 is provided with a vent hole 12a (first vent hole). The ventilation hole 12 a is a through hole that communicates the inside and outside of the housing 10. That is, the space area (inner area) in the housing 10 (cylindrical part 11) and the space area (outer area) outside the housing 10 (cylindrical part 11) are connected via the vent hole 12a.

  In the present embodiment, a plurality of vent holes 12a are provided radially from the center of the top plate 12 (the cylinder axis of the housing 10) toward the outside.

  Further, a through hole 12 b for inserting the support pipe 60 is provided in the center of the top plate portion 12.

  The housing 10 is preferably formed of a material having high thermal conductivity. For example, as the material of the housing 10, a metal such as aluminum or magnesium, or a heat conductive resin obtained by mixing carbon or the like with a resin is used. As an example, the housing 10 has a height in the Y-axis direction of 270 mm and a plate thickness of 1 mm.

  The shape of the cylindrical portion 11 is not limited to a cylindrical shape, and may be a polygonal cylindrical shape such as a square, pentagon, or hexagon.

[Base]
The base 20 is a plate-like member disposed so as to cover the opening 11 a of the housing 10. The base 20 is a module plate (MP) for mounting the LED module 30. In the present embodiment, six module mounting areas are secured on the front surface of the base 20, and six LED modules 30 are fixed to the base 20. A heat sink 50 is attached to the rear side surface of the base 20.

  As shown in FIGS. 4 and 5, the base 20 is provided with a vent hole 20 a (second vent hole). The ventilation hole 20 a is a through hole that communicates the inside and outside of the housing 10. That is, the space area (inner area) in the cylindrical portion 11 of the casing 10 and the space area (outer area) outside the cylindrical section 11 of the casing 10 are connected via the vent hole 20a.

  FIG. 6A is a plan view of the illumination device 1 when viewed from the front side in the Z-axis direction. As shown in FIG. 6A, in the present embodiment, a plurality of vent holes 20a are provided in the peripheral portion of the base 20 and are provided in a ring shape along the circumferential direction of the base 20. Specifically, the plurality of vent holes 20a are provided so as to be arranged in an annular shape. Each air hole 20a is formed, for example, by cutting out the plate material of the base 20, and a bridge is formed between the air holes 20a as the remainder of the plate material.

  Further, as shown in FIGS. 4 and 5, the base 20 is connected to the front end 61 of the support pipe 60. Specifically, a fitting hole 20 b for fitting the front end portion 61 of the support pipe 60 is provided in the center portion of the base 20. A module mounting area for mounting the LED module 30 is provided around the fitting hole 20b.

  The base 20 is a disk-shaped member made of a material having high thermal conductivity. Examples of the material of the base 20 include metals such as aluminum and magnesium. As an example, the thickness of the base 20 is 1.0 to 5.0 mm.

  The planar view shape of the base 20 is not limited to a circular shape, and may be a polygonal shape such as a square, a pentagon, or a hexagon according to the shape of the housing 10.

  The base 20 configured in this way is attached to the lower part (lower part) of the cylindrical part 11 of the housing 10 so that the LED module 30 faces downward. The base 20 and the cylindrical portion 11 are fixed by, for example, caulking a part of the cylindrical portion 11 to the outer edge portion of the base 20.

[LED module]
The LED module 30 will be described with reference to FIG. 6B. FIG. 6B is a plan view when seen through the reflector 91 and the front cover 92 in FIG. 6A.

  As shown in FIG. 6B, the LED module 30 is fixed to the base 20. In the present embodiment, six LED modules 30 are arranged in the module mounting region of the base 20 at an angle of 60 ° around the fitting hole 20 b of the base 20.

  Each LED module 30 is a light emitting module that emits light of a predetermined color (wavelength), and includes a substrate 31 and a light emitting unit 32 formed on the substrate 31. The LED module 30 (light emitting unit 32) emits light by DC power supplied from a power supply unit (not shown), and the light emitted from the LED module 30 passes through the reflector 91 and the front cover 92 to the front side of the lighting device 1. Emitted.

  The light emitting unit 32 includes an LED 32a and a sealing member 32b. The LED module 30 in the present embodiment has a COB structure in which a bare chip LED 32 a is directly mounted on a substrate 31. That is, the light emitting unit 32 (LED 32 a and sealing member 32 b) is disposed on the front surface of the base 20 through the substrate 31.

  The substrate 31 is, for example, a ceramic substrate made of ceramics such as alumina, a metal base substrate (metal substrate) in which a metal plate such as aluminum is coated with an insulating film, a resin substrate made of resin, or an insulating substrate such as a glass substrate. is there. On the surface of the substrate 31, metal wiring (not shown) patterned in a predetermined shape is formed to supply power to the light emitting unit 32. Moreover, although the shape of the board | substrate 31 is made into the rectangular shape, it is not restricted to this.

  A plurality (for example, 132) of LEDs 32a are mounted on the front surface of the substrate 31. The plurality of LEDs 32 a mounted on the substrate 31 are electrically connected by metal wiring or wires formed on the substrate 31. The LED 32a is an example of a light emitting element, and is a semiconductor light emitting element that emits light with a predetermined power. Each of the LEDs 32a is a bare chip that emits monochromatic visible light. In the present embodiment, the LED 32a is a blue LED chip that emits blue light when energized.

  The sealing member 32b is a member that seals the LED 32a. In the present embodiment, the sealing member 32b collectively seals the plurality of LEDs 32a. The sealing member 32b is made of, for example, a translucent resin material.

  The sealing member 32b in the present embodiment includes a phosphor as a wavelength conversion material, and converts the wavelength (color) of light emitted from the LED 32a. For example, when the LED 32a obtains white light with a blue LED chip, a phosphor-containing resin in which a yellow phosphor such as YAG is dispersed in a silicone resin can be used as the sealing member 32b. As a result, part of the blue light emitted from the LED 32a is converted into yellow light by the yellow phosphor, and the yellow light and the other part of the blue light are mixed, thereby causing white light from the sealing member 32b. Is emitted.

  Each LED module 30 is attached in a state where it is thermally coupled to the module attachment region of the base 20, and is fixed to the base 20 with, for example, a fastener, a screw, an adhesive, or the like.

[cooling fan]
One or a plurality of cooling fans 40 are provided inside the housing 10. In the present embodiment, as shown in FIGS. 3 to 5, four cooling fans 40 are provided in the lower part of the housing 10 so as to be arranged in the vicinity of the base 20. Specifically, the four cooling fans 40 are attached to the inner peripheral surface of the housing 10 at intervals of 90 ° around the support pipe 60 in the vicinity of the rear surface of the base 20.

  The cooling fan 40 includes, for example, a housing, an intake port (intake opening) provided in the housing, an impeller, a motor, and an exhaust port (exhaust opening). Air around the cooling fan 40 is provided. Is blown in a predetermined direction. Specifically, when the impeller is rotated by a motor, the air outside the cooling fan 40 is introduced into the housing via the intake port and discharged from the exhaust port to the outside.

  The motor is rotated by electric power supplied from the outside of the lighting device 1. In this case, the motor may be configured to always rotate when the lighting device 1 is turned on, or the motor may be configured to rotate only when necessary by a control signal. In other words, the cooling fan 40 may always be sucking / exhausting, or may be sucking / exhausting only when necessary.

  The cooling fan 40 has an intake port and an exhaust port in the direction in which the air in the housing 10 is directed from one of the ventilation hole 12a of the housing 10 and the ventilation hole 20a of the base 20 to the other. It is provided to blow in the same direction as the direction of the natural convection. That is, the cooling fan 40 is installed so that the air blowing direction matches the direction of natural convection in the housing 10.

  For example, as in the present embodiment, when the lighting device 1 is attached to the ceiling surface and the opening 11a is located at the lower part of the casing 10, the natural convection in the casing 10 is from the lower part of the casing 10 to the upper part. Occurs towards. Therefore, in this case, for example, the cooling fan 40 may be installed such that the intake port faces the rear surface of the base 20 or the heat radiation fin 52b and the exhaust port faces the vent hole 12a. That is, it is preferable to arrange the exhaust port of the cooling fan 40 toward the rear (ceiling surface).

  The cooling fan 40 may be provided outside the housing 10 instead of inside the housing 10 as long as the cooling fan 40 is configured to blow in the same direction as the natural convection direction. For example, the cooling fan 40 may be provided on the front surface of the base 20. Further, the cooling fan 40 may be provided not on the lower portion of the housing 10 (that is, in the vicinity of the base 20) but on the upper portion of the housing 10.

  Moreover, since the cooling fan 40 should just promote natural convection, the air volume of the cooling fan 40 may be very small. In the present embodiment, a cooling fan 40 having a driving sound level (noise level) of 20 dB or less is used. In this way, by using the cooling fan 40 having an operation sound level of 20 dB or less, a quiet illumination device can be realized even if the cooling fan 40 is incorporated.

[heatsink]
The heat sink 50 is a heat radiating member for radiating heat generated in the LED module 30. The heat sink 50 is disposed in the housing 10 and connected to the base 20. Therefore, the heat sink 50 radiates the heat of the LED module 30 conducted to the base 20.

  As shown in FIGS. 3 to 5, in the present embodiment, the heat sink 50 includes two heat sinks, a first heat sink 51 and a second heat sink 52. The first heat sink 51 and the second heat sink 52 may be made of a material having a high thermal conductivity, for example, a metal material such as aluminum. In addition, you may form the 1st heat sink 51 and the 2nd heat sink 52 using heat conductive resin etc. with high heat conductivity instead of metal.

  The first heat sink 51 is an inner heat sink disposed inside the second heat sink 52. The first heat sink 51 has an annular support portion 51a joined to the rear surface of the base 20 around the support pipe 60, and a plurality of strip-shaped heat radiation fins extending rearward from the outer periphery of the support portion 51a. 51b. That is, the radiation fins 51 b are provided so as to extend from the lower part to the upper part along the cylinder axis direction of the housing 10.

  On the other hand, the second heat sink 52 is an outer heat sink disposed outside the first heat sink 51. The second heat sink 52 includes a ring-shaped support portion 52a joined to the rear surface of the base 20 around the support portion 51a of the first heat sink 51, and a plurality of rearward extending portions from the outer peripheral portion of the support portion 52a. It consists of strip-shaped radiating fins 52b. That is, the radiating fins 52 b are provided so as to extend from the lower part of the housing 10 to the upper part.

  In the present embodiment, the plurality of radiating fins 51b surround the support pipe 60 and extend in parallel with the support pipe 60, and the plurality of radiating fins 52b surround the outside and extend in parallel with the support pipe 60. Yes. Moreover, each radiation fin 51b and 52b is arrange | positioned so that it may incline at a fixed angle (for example, 45 degrees) with respect to the radial direction from the central axis of the support pipe 60, when it planarly views from a Z-axis direction. . In addition, although the inner side radiation fin 51b is made longer than the outer side radiation fin 52b, it is not restricted to this.

  The first heat sink 51 and the second heat sink 52 configured as described above are fixed to the base 20 by fastening the support portion 51a and the support portion 52a to the base 20 with, for example, rivets or screws.

[Support pipe]
The support pipe 60 has a cylindrical shape made of a material having good heat conductivity, and extends from the inside of the housing 10 to the outside. As shown in FIGS. 4 and 5, the support pipe 60 is configured to extend from the central portion of the base 20 to the attachment member 80 toward the rear. The length of the support pipe 60 is about the same as or higher than the height of the housing 10 and is, for example, about 300 mm to 400 mm. The support pipe 60 is a straight pipe having an outer diameter of 27 mm and a wall thickness of about 1 mm to 3 mm as an example. Note that the support pipe 60 is not limited to a cylindrical shape, and other cylindrical bodies such as a rectangular tube shape may be used.

  A front end portion 61 that is one end portion of the support pipe 60 is fitted into the fitting hole 20 b of the base 20 and connected to the base 20. Specifically, by inserting the front end portion 61 of the support pipe 60 into the fitting hole 20b of the base 20 and caulking the front end portion 61 to the edge of the fitting hole 20b, Are joined.

  On the other hand, the rear end portion 62, which is the other end portion of the support pipe 60, is connected to the attachment member 80 while being inserted into the insertion port 82 of the attachment member 80.

  As described above, the support pipe 60 has a function of supporting the base 20 and functions as a heat conduction path that conducts heat from the base 20 to the mounting member 80 satisfactorily.

  In the present embodiment, the support pipe 60 is inserted through the through hole 71 a of the first cover 71, the through hole 72 a of the second cover 72, the through hole 12 b of the housing 10, the first heat sink 51 and the second heat sink 52. Yes.

  Examples of the material of the support pipe 60 include a metal such as stainless steel or a resin having good heat conductivity (a heat conductive resin obtained by mixing carbon with a resin).

  A wiring for supplying power to the LED module 30 is inserted into a hollow portion inside the support pipe 60. This wiring extends from the power supply unit (not shown) installed outside the lighting device 1 to the LED module 30 through the attachment member 80 and the support pipe 60.

[cover]
As shown in FIGS. 3 to 5, the cover 70 is disposed on the rear side of the housing 10. In the present embodiment, the cover 70 includes a first cover 71 and a second cover 72.

  The first cover 71 is a dust cover for preventing dust and the like from entering the housing 10 from the air holes 12 a of the housing 10. The first cover 71 is, for example, arranged in a cap shape so as to be disposed behind (upward) the housing 10 with a space from the housing 10 and to cover the vent hole 12a of the housing 10. The first cover 71 is provided with a through hole 71 a for inserting the support pipe 60.

  The second cover 72 supports the first cover 71 while preventing entry of dust and the like into the housing 10 from the gap between the through hole 12 b of the housing 10 and the support pipe 60. The second cover 72 is disposed between the top plate portion 12 of the housing 10 and the first cover 71. The second cover 72 is provided with a through hole 72a for inserting the support pipe 60.

[Mounting member]
The attachment member 80 is a fixing part for attaching and fixing the lighting device 1 to a construction material such as a ceiling. The attachment member 80 is also formed of a heat conductive material, like the support pipe 60.

  As shown in FIG. 4, the attachment member 80 includes a truncated cone-shaped pedestal portion 81 whose diameter increases rearward, and an insertion port 82 provided on the front end side of the pedestal portion 81 and into which the rear end portion 62 of the support pipe 60 is inserted. And a flange portion 83 provided on the rear end side of the pedestal portion 81.

  The rear end portion 62 of the support pipe 60 is inserted into the insertion port 82 and connected and fixed to the attachment member 80. The flange portion 83 is provided with a plurality of insertion holes. When the mounting member 80 is screwed and fixed to the construction material, the flange portion 83 is installed in the construction material by inserting a screw through the insertion hole and screwing it into the construction material. Secure to.

[Reflector]
As shown in FIGS. 3 to 5, the reflector 91 is a reflecting member that reflects the light emitted from the LED module 30 and guides it to the front cover 92. The reflector 91 can be made of, for example, white resin or metal.

  In the reflector 91 according to the present embodiment, an opening is formed for each LED module 30, and the inner surface of the opening is an inclined reflecting surface. Further, the reflector 91 is fixed to the front surface of the base 20 by screws. This fixing is not limited to screwing but may be other fixing methods such as adhesion.

[Front cover]
As shown in FIGS. 3 to 5, the front cover 92 is a light-transmitting cover that transmits light emitted from the LED module 30, and is formed of a transparent resin material such as acrylic resin, polyethylene terephthalate, or polycarbonate. Can do.

  Further, the front cover 92 may have a light distribution control function for condensing or diverging light from the LED module 30. For example, the front cover 92 may have a Fresnel lens structure, and may be configured to collect the light emitted from the LED module 30 and emit the light forward.

  The front cover 92 is fixed to the front surface of the base 20 by screws so as to cover the plurality of LED modules 30 as a whole. This fixing is not limited to screwing but may be other fixing methods such as adhesion.

[Effect of lighting device]
Next, the effect of the illuminating device 1 in this Embodiment is demonstrated including the background which came to this invention.

  An LED lamp that can be used as an alternative to an HID lamp has a high output and a large amount of heat generation. Therefore, it is desired to dissipate the heat generated in the LED module more efficiently.

  Therefore, the present inventors considered that heat generated in the LED module can be efficiently radiated by providing a cooling fan, and conducted the following experiment.

  7 and 8 are diagrams showing an installation pattern of the cooling fan in the lighting device when the experiment is performed. 7 and 8, an illumination device having the same structure as that of the illumination device 1 in the above embodiment is used except for the place where the cooling fan 40 is installed. Further, in each installation pattern, the lighting device is configured such that the attachment member 80 is located on the ceiling side and the housing 10 is located on the floor surface side (that is, the opening 11a is located on the lower portion of the housing 10). )installed.

  7A and 7B show a case where two cooling fans 40 are disposed opposite to the front side of the base 20. Among these, in FIG. 7A, the cooling fan 40 is disposed so as to exhaust the air in the housing 10 from the vent hole 20 a of the base 20. On the other hand, in FIG. 7B, the cooling fan 40 is arranged so as to blow air into the housing 10 from the vent hole 20 a of the base 20.

  FIGS. 7C and 7D show the case where the cooling fan 40 is disposed on the upper portion (rear side) of the flange portion 83 of the mounting member 80. Among these, the cooling fan 40 is arrange | positioned so that it may exhaust to back side in (c) of FIG. On the other hand, in (d) of Drawing 7, cooling fan 40 is arranged so that it may blow on the front side.

  (E), (f), and (g) of FIG. 8 are cases where the two cooling fans 40 are disposed to face each other between the housing 10 and the first cover 71. Among these, in FIG. 8A, the cooling fan 40 is disposed so as to exhaust air from the gap between the housing 10 and the first cover (dust cover) 61. On the other hand, in FIG. 8E, the cooling fan 40 is disposed so as to blow air toward the gap between the housing 10 and the first cover 71. Further, in FIG. 8G, a cover tape is applied so as to close a portion of the gap between the housing 10 and the first cover 71 other than the installation of the cooling fan 40 in FIG. 8E. Attached.

  In FIG. 8H, one cooling fan 40 is arranged on the front side of the base 20 so as to blow air into the housing 10 from the vent hole 20a of the base 20, and the housing 10 and the first One cooling fan 40 is disposed so as to exhaust air from the gap between the cover 71 and the cover 71.

  FIG. 9 shows the chip temperature Tj of the LED 32a in the case of natural air cooling (no cooling fan 40 is installed) and in the case of each installation pattern of the cooling fan 40 shown in FIGS. 7 and 8A to 8H. (° C), the temperature of the front cover 92 (° C), and the temperature of the reflector 91 are measured.

  In FIG. 9, the installation pattern in which the chip temperature Tj, the front cover temperature, and the reflector temperature are lowered as compared with the case of natural air cooling is hatched. It should be noted that when the temperature is slightly decreased, a dotted hatch is attached, and when the temperature is significantly reduced, hatched hatching is applied.

  In the illumination device 1, it is desired to lower the temperature of the chip temperature Tj of the LED 32a. As shown in FIG. 9, the chip temperature Tj is lower than the case of natural air cooling in the installation patterns of (a), (b), (e), (g), and (h). Among them, the chip temperature Tj is remarkably lowered in the installation patterns (b) and (h).

  On the other hand, in the installation pattern of (c), the chip temperature Tj does not change compared to the case of natural air cooling. In the installation patterns (d) and (f), the chip temperature Tj is higher than that in the case of natural air cooling.

  As described above, when installing the cooling fan 40 in the lighting device 1, the inventors of the present application not only have the cooling effect of the chip temperature but also the chip temperature rises simply by installing the cooling fan 40. I found out that it might give the opposite effect.

  Then, as a result of intensive studies by the inventors of the present invention based on the experimental results shown in FIG. 9, cooling is performed so that the air blowing direction (exhaust direction) of the cooling fan 40 matches the direction in which the air in the housing 10 naturally convects. The idea that the temperature of the LED 32a can be lowered by installing the fan 40 and exhausting the air in the housing 10 out of the housing 10 by the cooling fan 40 was obtained. That is, it is considered that the temperature rise of the LED 32a that cannot be covered by natural air cooling can be suppressed by using the installation patterns of (a), (b), (e), (g), and (h).

  Moreover, as shown in the installation patterns of (b) and (h), the cooling fan 40 is installed in the vicinity of the base 20 and is installed so as to blow air to the vent hole 20a of the base 20, whereby the temperature of the LED 32a is set. We found that it can be significantly reduced.

  Furthermore, in the installation patterns of (b) and (h), the temperature of the front cover 92 can also be reduced as compared with the case of natural air cooling. Further, in the installation pattern of (h), not only the temperature of the LED 32a and the front cover 92 but also the temperature of the reflector 91 can be reduced as compared with the case of natural air cooling.

  In the installation patterns (d) and (f), it is considered that the air blowing direction of the cooling fan 40 is opposite to the natural convection in the housing 10, which hinders the heat dissipation effect.

  As described above, according to the lighting device 1 according to the present embodiment, the air in the housing 10 is caused to flow through the ventilation holes 12a and the base 20 of the housing 10 as shown in FIG. It will flow in the same direction as the direction of natural convection from one side of the pore 20a toward the other.

  For example, when the lighting device 1 is installed such that the opening 11a is positioned at the lower part of the housing 10, natural convection occurs from the bottom (floor surface) to the top (ceiling surface). In this case, in the present embodiment, the cooling fan 40 is arranged so that air in the housing 10 blows in a direction from the bottom (floor surface) to the top (ceiling surface). That is, in the cooling fan 40, the air in the housing 10 is directed from the vent hole 20 a of the base 20 provided at the lower portion of the housing 10 to the vent hole 12 a of the housing 10 provided at the upper portion of the housing 10. It arrange | positions so that it may blow in a direction.

  As a result, the cooling fan 40 can cause the air in the housing 10 to flow in the same direction as the natural convection in the housing 10, so that the air in the housing 10 passes through the ventilation holes 12 a of the housing 10. Can be exhausted outside. That is, the natural convection in the housing 10 can be promoted by the cooling fan 40. As a result, the heat generated in the light emitting unit 32 (LED 32a) can be radiated more efficiently than in the case where the cooling fan 40 is not installed (in the case of heat dissipation only by natural air cooling), so that the temperature rise of the light emitting unit 32 is increased. Can be suppressed. Therefore, it is possible to improve the light emission efficiency of the LED 32a and suppress a decrease in light output, and to extend the life of the LED 32a. Further, deterioration of the sealing member 32b due to heat can be suppressed.

  Furthermore, not only a cooling effect can be obtained by blowing air from the cooling fan 40, but also accumulation of dust in the housing 10 can be suppressed. Thus, by installing the cooling fan 40, a structure that does not accumulate dust can be realized.

  In the present embodiment, the cooling fan 40 is disposed in the vicinity of the base 20. As a result, as shown in FIG. 4, the cooling fan 40 can actively draw air into the housing 10 in the same direction as natural convection through the vent hole 20 a of the base 20. As a result, since natural convection in the housing 10 can be further promoted, it is possible to remarkably suppress an increase in chip temperature in the LED 32a. Therefore, the temperature rise of the light emission part 32 can be suppressed more effectively.

  In the present embodiment, the vent hole 12 a of the housing 10 is provided in the top plate portion 12. Thereby, since the ventilation hole 20a of the base 20 and the ventilation hole 12a of the housing | casing 10 can be faced, the exhaust path of the air in the housing | casing 10 can be made straight. Therefore, since the air in the housing 10 can be exhausted more efficiently, the temperature rise of the light emitting unit 32 can be more effectively suppressed.

  Further, in the present embodiment, a plurality of vent holes 12a of the housing 10 are provided radially. Thereby, since the air in the housing | casing 10 can be exhausted more efficiently, the temperature rise of the light emission part 32 can be suppressed more effectively.

  Further, in the present embodiment, a plurality of vent holes 20 a of the base 20 are provided in an annular shape at the peripheral edge of the base 20. Thereby, since the air in the housing | casing 10 can be exhausted efficiently, the temperature rise of the light emission part 32 can be suppressed effectively.

  In the present embodiment, the heat sink 50 connected to the other surface of the base 20 is disposed in the housing 10. In addition, the heat sink 50 includes a plurality of heat radiation fins 51 b and 52 b extending in the cylinder axis direction of the housing 10. Thereby, the radiation fins 51b and 52b of the heat sink 50 can be cooled by the ventilation by the cooling fan 40. Therefore, since heat dissipation by the heat sink 50 can be promoted, the temperature rise of the light emitting unit 32 can be further effectively suppressed.

(Modifications, etc.)
As mentioned above, although the illuminating device which concerns on this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the above-described embodiment, the LED module 30 has a COB type configuration in which the LED chip is directly mounted on the substrate 31. However, the present invention is not limited to this. For example, a package type LED element (SMD type LED element) in which an LED chip (light emitting element) is mounted in a concave portion of a resin container and a sealing member (phosphor-containing resin) is enclosed in the concave portion is used. In addition, an SMD type LED module configured by mounting a plurality of the LED elements on the substrate 31 may be used.

  Moreover, in the said embodiment, although the ventilation hole 12a of the housing | casing 10 was provided in the top-plate part 12, it is not restricted to this. For example, the vent hole 12 a of the housing 10 may be provided in the cylindrical portion 11 of the housing 10. In this case, the vent hole 12a is preferably provided in a rear side portion (upper part) of the cylindrical portion 11. Further, the air holes 12 a may be provided in both the top plate portion 12 and the cylindrical portion 11.

  Moreover, in the said embodiment, although the heat sink 50 was made into the two heat sinks of the 1st heat sink 51 and the 2nd heat sink 52, any one may be sufficient. Moreover, although the 1st heat sink 51 and the 2nd heat sink 52 were the structures which have a some strip-shaped heat radiation fin, it is not restricted to this.

  In the above embodiment, the LED module 30 is a BY type light emitting module configured to emit white light by a blue LED chip and a yellow phosphor, but is not limited thereto. For example, in order to improve color rendering properties, a red phosphor or a green phosphor may be further mixed in addition to the yellow phosphor. Moreover, it is also possible to use a phosphor-containing resin containing a red phosphor and a green phosphor without using a yellow phosphor, and to emit white light by combining this with a blue LED chip. it can.

  Moreover, in the said embodiment, you may use the LED chip which light-emits colors other than blue as an LED chip. For example, in the case of using an ultraviolet light emitting LED chip, a combination of phosphors that emit light in three primary colors (red, green, and blue) can be used as the phosphor. Furthermore, a wavelength conversion material other than a phosphor may be used. For example, as a wavelength conversion material, light of a certain wavelength, such as a semiconductor, a metal complex, an organic dye, or a pigment, is absorbed, and light having a wavelength different from the absorbed light. A material containing a substance that emits may be used.

  Further, in the above embodiment, the LED is exemplified as the light emitting element. However, other solid light emitting elements such as a semiconductor light emitting element such as a semiconductor laser or an EL element such as an organic EL (Electro Luminescence) or an inorganic EL are used. Also good.

  Moreover, in the said embodiment, although the illuminating device 1 was used as the illuminating device replaced with the HID lamp attached to ceilings, etc. of a gymnasium, a factory, or a warehouse, it is applied also to other illuminating devices, such as a spotlight and a downlight. be able to.

  In addition, the present invention can be realized by various combinations conceived by those skilled in the art for each embodiment, or by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present invention. This form is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Case 11 Cylindrical part 11a Opening part 12 Top plate part 12a, 20a Vent hole 12b, 71a, 72a Through-hole 20 Base 20b Fitting hole 30 LED module 31 Substrate 32 Light-emitting part 32a LED
32b Sealing member 40 Cooling fan 50 Heat sink 51 First heat sink 51a, 52a Support portion 51b, 52b Radiation fin 52 Second heat sink 60 Support pipe 61 Front end portion 62 Rear end portion 70 Cover 71 First cover 72 Second cover 80 Mounting member 81 Pedestal part 82 Insertion slot 83 Flange part 91 Reflector 92 Front cover

Claims (14)

A cylindrical housing having an opening;
A plate-like base arranged so as to cover the opening;
A light emitting unit disposed on one surface of the base;
With a cooling fan,
Each of the casing and the base is provided with a vent hole that communicates the inside and outside of the casing.
The cooling fan is a direction in which the air in the casing is directed from one of the vent hole of the casing and the vent hole of the base to the other, and is the same as the direction of natural convection in the casing. Lighting device arranged to flow in the direction. The lighting device according to claim 1, wherein the cooling fan is disposed in the vicinity of the base. When the lighting device is attached to the ceiling surface, the opening is located at the lower part of the housing,
The lighting device according to claim 2, wherein the ventilation hole provided in the housing is provided in an upper portion of the housing. The lighting device according to claim 2, wherein the ventilation hole provided in the housing is provided in a top surface portion of the housing. The lighting device according to claim 4, wherein a plurality of vent holes provided in the housing are provided radially. The said cooling fan is provided in the lower part of the said housing | casing, and ventilates the air in the said housing | casing in the direction which goes to the said air vent of the said housing | casing from the said vent hole of the said base. The lighting device according to claim 1. The lighting device according to any one of claims 3 to 6, further comprising a cover that is disposed above the housing with a space from the housing and covers the vent hole of the housing. The lighting device according to claim 1, wherein the cooling fan is provided in the housing. The lighting device according to any one of claims 1 to 8, wherein a plurality of air holes provided in the base are annularly provided at a peripheral edge of the base. Furthermore, the illuminating device of any one of Claims 1-9 provided with the heat sink connected to the other surface of the said base, and arrange | positioned in the said housing | casing. The lighting device according to claim 10, wherein the heat sink has a plurality of heat radiation fins extending in a cylinder axis direction of the casing. And a support pipe extending from the inside of the housing to the outside,
The lighting device according to claim 1, wherein the base is connected to one end of the support pipe. The lighting device according to claim 12, further comprising an attachment member connected to the other end of the support pipe. The lighting device according to claim 1, wherein an operating sound level of the cooling fan is 20 dB or less.

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