JP2015022991A - Illuminating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminating device in which versatility can be enhanced while heat dissipation performance is improved.SOLUTION: An illuminating device 1 comprises: a main body 21 that comprises a hollow part 21a and in which openings 21b and 21c are formed at both ends; a first heat dissipating member 31 that is attached to the one opening 21b of the main body 21; a second heat dissipating member 32 that is attached to the other opening 21c of the main body 21; a light emitting unit 22 that is fixed to the first heat dissipating member 31 and comprises light emitting elements; and a plurality of heat conducting pillars 33 that are fixed to the second heat dissipating member 32 and in which end surfaces 33a are in contact with the first heat dissipating member 31.

Description

  The present invention relates to a lighting device using a light emitting element such as an LED.

  A light emitting element such as an LED generates heat simultaneously with light emission, and the temperature of the entire lighting device rises. Further, by increasing the amount of light, the amount of heat generation increases, and the temperature rise of the lighting device further increases. Therefore, it is necessary to improve the heat dissipation of the lighting device in order to suppress the temperature rise of the lighting device. Therefore, conventionally, in order to prevent the life of the lighting fixture from being shortened due to the temperature of the light emitting element, a lighting fixture including a radiation fin that radiates heat generated from the light emitting element has been proposed (for example, see Patent Document 1). Patent Document 1 discloses a lighting fixture that includes a plurality of heat dissipating fins on an inclined surface that is inclined with respect to a mounting surface of a light emitting element, and improves heat dissipation using convection.

JP 2012-160417 A

  By the way, the light emitting units used as the illumination device have a large amount of emitted light and a small one, and it is desirable that the heat dissipating fins have heat dissipating characteristics in accordance with the heat generation amount of the light emitting unit. However, when it is molded into a predetermined shape as in Patent Document 1, the heat dissipation performance of the heat dissipating fins is constant and the setting corresponding to the predetermined heat generation amount, so that the light emitting unit has a large amount of light If the light emitting unit has a small amount of light, excessive heat dissipation performance is obtained. On the other hand, it is required that any light emitting unit used as the lighting device can be easily set to an optimum heat dissipation characteristic.

  Accordingly, an object of the present invention is to provide a lighting device that can improve versatility and can be mounted with various light emitting units while improving heat dissipation.

  The lighting device of the present invention has a hollow portion, a main body having openings at both ends, a first heat radiating member attached to one opening of the main body, and a second heat radiating member attached to the other opening of the main body. A member, a light emitting unit fixed to the first heat radiating member and having a light emitting element, and a plurality of heat conduction columns fixed to the second heat radiating member and having end faces in contact with the first heat radiating member.

  According to the illumination device of the present invention, the heat conduction column is inserted into the second heat radiating member and has a structure for radiating heat from the light emitting unit through the first heat radiating member, thereby increasing the contact area with the outside air. The number of heat conduction columns can be changed to the optimal heat dissipation characteristics according to the heat generation characteristics of the unit, so light emitting units with different heat generation characteristics can be attached to the main body, improving heat dissipation The versatility of the lighting device can be improved.

It is an external view which shows embodiment of the illuminating device which concerns on this invention. It is a bottom view which shows embodiment of the illuminating device which concerns on this invention. It is sectional drawing which shows the III-III cross section in the illuminating device of FIG. It is a top view which shows an example of the 2nd heat radiating member 32 to which the several heat conductive support | pillar of FIG. 3 was fixed. It is a schematic diagram which shows a mode that a heat conductive support | pillar is inserted in the 2nd heat radiating member of FIG. It is a schematic diagram which shows a mode that the light source part of FIG. 3 is assembled. It is sectional drawing which shows the mode of the heat radiation in the light source part of FIG.

  Hereinafter, an embodiment of a lighting device will be described with reference to the drawings. FIG. 1 is an external view showing an embodiment of a lighting device according to the present invention, and FIG. 2 is a bottom view showing the embodiment of the lighting device according to the present invention. The lighting device 1 of FIGS. 1 and 2 includes a power supply unit 10 that supplies power for emitting light, and a light source unit 20 that is supplied with power from the power supply unit 10 and emits light. The power supply unit 10 and the light source unit 20 are connected using a connection member 40, the power supply unit 10 side is fixed to a wall surface such as a ceiling, for example, and light is emitted from the lower surface of the light source unit 20 to an indoor space or the like. Here, the connecting member 40 connects the power supply unit 10 and the light source unit 20 with a gap D formed therebetween. The heat generated from the light emitting unit 22 is radiated from the main body 21, and the heat generated from the power supply unit 12 is radiated from the housing 11. For this reason, the interference of the heat between the power supply part 10 and the light source part 20 is relieved, and the influence on heat dissipation can be reduced.

  3 is a cross-sectional view showing a III-III cross section in the illumination device 1 of FIG. The power supply unit 10 has a structure in which a power supply unit 12 is built in a housing 11 having an opening in the upper part, and is detachably attached to a mounting plate 2 installed on a wall surface such as a ceiling surface. Specifically, the mounting plate 2 is provided with mounting screws 2 a, and the mounting screws 2 a are inserted so as to penetrate the housing 11. And by attaching the knob 3 to the front-end | tip of the attachment screw 2a which penetrated, the power supply part 10 is attached to the attachment plate 2, and the illuminating device 1 whole is fixed to a wall surface. The power supply unit 12 includes an inverter circuit that converts electric power supplied from a commercial power source into driving power for driving the light emitting unit 22, and is electrically connected to the light source unit 20 via the wiring 14. The power supply unit 12 has a connector 13 that is electrically connected to an external terminal, and is connected to a commercial power supply via the connector 13.

  The light source unit 20 emits light, and includes a main body 21, a light emitting unit 22, a first heat radiating member 31, a second heat radiating member 32, and a plurality of heat conducting columns 33. The main body 21 is made of a metal having good thermal conductivity, and has, for example, a cylindrical shape having a hollow portion 21a therein. Screw holes 21d are respectively formed in the openings 21b and 21c of the hollow portion 21a of the main body 21, and the first heat radiating member 31 is fixed to one opening 21b of the main body 21 by screws or the like inserted into the screw holes 21d. In addition, the second heat radiating member 32 is fixed to the other opening 21c by a screw or the like inserted into the screw hole 21d.

  The light emitting unit 22 has a plurality of light emitting elements composed of LEDs or the like, and is fixed on the first heat radiating member 31. The light emitting unit 22 is electrically connected to the power supply unit 12 via the wiring 14 and is supplied with electric power from the power supply unit 12 to emit light. The front surface of the light emitting unit 22 is covered with a protective cover 23, and a light transmissive light transmissive cover 24 is attached on the protective cover 23. The light transmission cover 24 is held by a reflection plate 25 that reflects light at the periphery, and the reflection plate 25 is fixed to the first heat radiating member 31 with screws or the like. Here, when the reflecting plate 25 is fixed to the first heat radiating member 31, the light transmitting cover 24 presses the light emitting unit 22 and the protective cover 23 against the first heat radiating member 31. Thereby, the light emitting unit 22 is in close contact with the first heat radiating member 31, and heat generated from the light emitting unit 22 is easily conducted to the first heat radiating member 31.

  The first heat radiating member 31 is made of a material having good thermal conductivity such as aluminum, and has a disk shape in accordance with the shape of the opening 21b. The first heat radiating member 31 is fixed to one opening 21b of the main body 21 with a screw or the like, and is in close contact with the main body 21 on the outer edge 31a side. Therefore, the heat of the first heat radiating member 31 is conducted to the main body 21 side. Further, as described above, the light emitting unit 22 is fixed on the first heat radiating member 31, and the heat of the light emitting unit 22 is conducted to the first heat radiating member 31.

  The second heat radiating member 32 is made of a material having good thermal conductivity such as aluminum, and has a disk shape in accordance with the shape of the opening 21b. The second heat radiation member 32 is fixed to the other opening 21c of the main body 21 with a screw or the like, and is in close contact with the main body 21 on the outer edge 32a side. Therefore, the heat of the second heat radiating member 32 is conducted to the main body 21 side.

  Each of the plurality of heat conduction columns 33 is made of a material having good heat conductivity such as aluminum, and is formed in a columnar shape, for example. The plurality of heat conduction columns 33 are respectively fixed to the second heat radiating member 32, and the one end surface 33 a is in contact with the first heat radiating member 31. Therefore, the heat of the first heat radiation member 31 is conducted to the plurality of heat conduction columns 33, and the heat of the plurality of heat conduction columns 33 is conducted to the second heat radiation member 32. In addition, the other end surface 33b side of the heat conduction column 33 protrudes from the surface of the second heat radiating member 32 to the power supply unit 10 side, and the heat conduction column 33 itself is also in contact with the outside air.

  Here, FIG. 4 is a top view showing an example of the second heat radiating member 32 to which the plurality of heat conducting columns 33 of FIG. 3 are fixed. The second heat radiating member 32 includes a plurality of mounting holes 32x into which the heat conducting columns 33 are inserted, and screw holes 32b for fixing the second heat radiating member 32 to the main body 21 on the outer peripheral surface side of the second heat radiating member 32. And a screw hole 32c for attaching the connecting member 40. In FIG. 4, nine attachment holes 32x are formed, and the heat conduction column 33 is press-fitted and fixed in each attachment hole 32x. The plurality of mounting holes 32x are formed so that the heat conducting columns 33 are arranged at intervals, and do not prevent air convection in the hollow portion 21a of the main body 21.

  In particular, the second heat radiating member 32 has a structure that can increase or decrease the number of mounting holes 32x and heat conducting columns 33. A two-dot chain line in FIG. 4 is an example of an assumed line when the number of the heat conduction columns 33 is increased. When increasing the number of the heat conduction columns 33 attached to the main body 21, the attachment holes 32x are formed in the region of the two-dot chain line in the second heat radiation member 32 of FIG. 4, and the heat conduction columns 33 are fixed to the attachment holes 32x. Become. The numbers of the mounting holes 32x and the heat conduction columns 33 are set according to the heat generation amount (light emission amount) of the light emitting unit 22.

  That is, when the amount of heat generated by the light emitting unit 22 is large, a large number of mounting holes 32x and heat conduction columns 33 are provided accordingly. Then, the contact area between the first heat radiation member 31 and the plurality of heat conduction columns 33 is increased, and the volume of the plurality of heat conduction columns 33 is increased. For this reason, the heat radiation performance of the whole heat radiating unit composed of the main body 21, the first heat radiating member 31, the second heat radiating member 32, and the plurality of heat conducting columns 33 can be set high. On the other hand, when the calorific value of the light emitting unit 22 is small, a small number of mounting holes 32x and the number of heat conduction columns 33 are provided accordingly. Then, the cost for that becomes unnecessary, without providing the heat conduction support | pillar 33 more than necessary. Thus, the number of the mounting holes 32x and the heat conduction columns 33 can be set so that necessary and sufficient heat dissipation characteristics can be obtained with respect to the heat generation amount (light emission amount) of the light emitting unit 22.

  FIG. 5 is a schematic view showing a state in which the heat conduction column 33 is inserted into the second heat radiating member 32 in FIG. 4, and FIG. 6 is a schematic view showing a state in which the light source part in FIG. 3 is assembled. An assembly example of the lighting device 1 will be described with reference to FIG. First, as shown in FIG. 5, the heat conduction columns 33 are fixed to the attachment holes 32 x of the second heat radiation member 32 formed in advance according to the heat generation amount of the light emitting unit 22. At this time, the mounting hole 32x of the second heat radiating member 32 is formed with a diameter A, and the heat conducting column 33 is formed with a diameter B larger than the diameter A (diameter A <diameter B). In addition, about the dimension management value of the diameter A and the diameter B, the dimension management by JIS B 0401-2 can be used, for example. And the heat conduction support | pillar 33 is dimension-controlled with respect to the attachment hole 32x, and is press-fitted, and the 2nd heat radiating member 32 and the heat conduction support | pillar 33 contact | adhere completely. Thus, by eliminating the gap between the second heat radiation member 32 and the heat conduction column 33, heat conduction from the heat conduction column 33 to the second heat radiation member 32 can be efficiently performed, and the inside of the main body 21 It is possible to prevent dust and the like from entering. Further, the connection member 40 is attached to the second heat radiating member 32. On the other hand, the light emitting unit 22 is attached to the first heat radiating member 31 in advance.

  Thereafter, the first heat radiating member 31 and the second heat radiating member 32 are fixed to the main body 21 with mounting screws or the like. Accordingly, the first heat radiating member 31 and the second heat radiating member 32 are in contact with the main body 21 at the outer edges 31 a and 31 b, respectively, and the one end surface 33 a of the heat conducting column 33 is in contact with the first heat radiating member 31. Here, the length H1 from the second heat radiating member 32 to the one end surface 33a of the plurality of heat conducting columns 33 is the length from the mounting position of the first heat radiating member 31 to the mounting position of the second heat radiating member 32 in the main body 21. H2 or more (H1 ≧ H2). Then, since the heat conduction column 33 is fixed to the main body 21 in a state where the first heat radiation member 31 is pressed, the one end surface 33 a of the heat conduction column 33 is in close contact with the first heat radiation member 31. Thereby, heat can be efficiently conducted from the first heat radiation member 31 to the heat conduction column 33. Thereafter, the light transmitting cover 24 and the reflecting plate 25 are attached on the light emitting unit 22, and the power supply unit 10 is attached to the connecting member 40 (see FIG. 3).

  FIG. 7 is a cross-sectional view showing a state of heat dissipation in the light source unit 20 of FIG. In FIG. 7, heat generated by driving the light emitting unit 22 is conducted to the first heat radiating member 31, and is conducted from the first heat radiating member 31 to the main body 21. Further, the heat of the first heat radiating member 31 is conducted to the second heat radiating member 32 through the heat conducting column 33. And the heat | fever of the main body 21, the 1st heat radiating member 31, the 2nd heat radiating member 32, and the several heat conductive support | pillar 33 is radiated | emitted to external air.

  According to the above embodiment, the first heat radiating member 31 and the second heat radiating member 32 attached to both ends of the main body 21 are connected by the heat conducting column 33, so that the heat conducting column 33 is connected from the light emitting unit 22. Since the heat conducted via the heat radiation member 32 is also radiated from the second heat radiating member 32 side, it is possible to increase the outside air contact area in the lighting device 1 to improve the heat dissipation and to ensure the life of the lighting device 1. Further, when the heat conduction column 33 protrudes from the second heat radiation member 32 to the outside, heat radiation is also performed from the heat conduction column 33 to the outside air, so that the heat dissipation can be further improved.

  In particular, the light emitting unit 22 having any characteristics can be mounted on the light source unit 20 because it has a structure in which the number of the heat conducting columns 33 can be set as appropriate in accordance with the heat generation amount of the light emitting unit 22. The versatility of the light source unit 20 can be improved. That is, when the shape of the heat radiating fin is fixed and the heat radiating characteristic is constant as in the conventional case, it is suitable for a light emitting unit having a specific heat generation amount. However, if a light emitting unit 22 that generates more heat than a specific light emitting unit is mounted, heat dissipation will be insufficient, and if a light emitting unit that generates less heat than a specific light emitting unit is mounted, excessive heat dissipation will result. Cost becomes high. On the other hand, in the light source unit 20 described above, in the case where the light emitting unit 22 having a large calorific value is used, insufficient heat radiation can be prevented by increasing the number of the heat conducting columns 33 and improving the heat radiation characteristics. . Moreover, when the light emitting unit 22 with a small calorific value is used, the number of parts can be reduced and the cost can be reduced by reducing the number of the heat conduction columns 33. Thus, since the number of the heat conducting columns 33 can be adjusted according to the light flux value of the light emitting unit 22, the versatility of the light source unit 20 can be enhanced and the cost can be suppressed to a necessary minimum. .

  Further, since the gap D is formed between the power supply unit 10 and the light source unit 20, the heat generated from the light emitting unit 22 is radiated from the main body 21, and the heat generated from the power supply unit 12 is Heat is radiated from the body 11. For this reason, the interference of the heat between the power supply part 10 and the light source part 20 is relieved, and the influence on heat dissipation can be reduced.

  The embodiment of the present invention is not limited to the above embodiment. For example, although the case where the main body 21 is formed in a cylindrical shape is illustrated, the outer shape may be formed in a square shape or the like. Moreover, although the case where the attachment hole 32x is formed in the circular shape is illustrated, it is not limited thereto, and may be formed in a polygonal shape. In addition, in FIG. 4, the case where a plurality of mounting holes 32 x and a plurality of heat conduction columns 33 are arranged in a cross shape is illustrated, but any arrangement may be used, for example, a lattice shape. It may be a thing.

  Furthermore, although the heat conductive support 33 is illustrated as being press-fitted into the mounting hole 32x and fixed, a heat conductive adhesive may be used, or the mounting hole 32x may be flanged to the edge of the hole by burring or the like. And may be fixed by press-fitting or caulking, etc., so as to improve the adhesion with the heat conduction column 33. Further, the case where the light emitting element is an LED in the light emitting unit 22 is illustrated, but other light emitting diodes and EL elements may be used.

  DESCRIPTION OF SYMBOLS 1 Illuminating device, 2 mounting plate, 2a mounting screw, 3 knob, 10 power supply part, 11 housing | casing, 12 power supply unit, 13 connector, 14 wiring, 20 light source part, 21 main body, 21a hollow part, 21b one opening, 21c Other opening, 21d screw hole, 22 light emitting unit, 23 protective cover, 24 light transmission cover, 25 reflector, 31 first heat radiating member, 31a outer edge, 32 second heat radiating member, 32a outer edge, 32b screw hole, 32c screw hole , 32x mounting hole, 33 heat conduction column, 33a one end face, 33b other end face, 40 connecting member, A, B diameter, H1, H2 length, D gap.

Claims (7)

A main body having a hollow portion and having openings at both ends;
A first heat dissipating member attached to one opening of the main body;
A second heat dissipating member attached to the other opening of the main body;
A light emitting unit fixed to the first heat dissipation member and having a light emitting element;
A lighting device, comprising: a plurality of heat conduction columns fixed to the second heat radiating member and having end faces in contact with the first heat radiating member.   The lighting device according to claim 1, wherein the number of the plurality of heat conduction columns is set according to a heat generation amount of the light emitting unit.   The lighting device according to claim 1, wherein the plurality of heat conduction columns are press-fitted and fixed to the second heat radiating member.   The length from the second heat radiating member to the end surface of the plurality of heat conducting columns is equal to or longer than the length from the mounting position of the first heat radiating member to the mounting position of the second heat radiating member in the main body. The illumination device according to any one of claims 1 to 3.   The lighting device according to any one of claims 1 to 4, wherein the plurality of heat conduction columns are fixed to protrude from a surface of the second heat radiating member. The main body has thermal conductivity,
The lighting device according to claim 1, wherein the first heat radiating member and the second heat radiating member are in contact with the main body on an outer edge side. A power supply unit for driving the light emitting unit;
The lighting device according to claim 1, further comprising: a connection member that connects the power supply unit and the main body via a gap.

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