JP6089598B2 - Lighting heat sink and lighting fixture - Google Patents

Description

  The present invention relates to a lighting heat sink having improved heat dissipation efficiency and a lighting fixture including the lighting heat sink.

  In recent years, the amount of light in LED lighting has been increasing, and in particular, LED downlights have been required to have a smaller diameter in order to increase the amount of light and to increase the degree of freedom of attachment. And if the light quantity is increased, the amount of heat generated by the LED module is increased accordingly, so it is necessary to improve the heat dissipation performance in accordance with the increase in the light quantity.

  As a method for improving the heat dissipation performance, it is conceivable to increase the heat dissipation area by enlarging the heatsink. However, if the heatsink is increased in the width direction, the diameter of the lighting fixture will be increased. Therefore, in order to increase the heat dissipation area without increasing the diameter of the lighting fixture, it is necessary to increase the height of the heat sink. However, as the height of the heat sink increases, the distance between the tip of the heat sink and the heat source increases, so heat conduction deteriorates and efficient heat dissipation cannot be performed in the entire heat sink, and sufficient heat dissipation performance is obtained. There is a risk of not.

  Conventional heat sinks have been proposed to improve the heat dissipation efficiency of heat sinks by connecting the heat dissipating fins with heat pipes and diffusing the heat generated from the LEDs to the entire heat sink using heat pipes (for example, Patent Documents). 1). Further, there has been proposed a structure in which a heat sink is formed by laminating graphite having a high thermal conductivity and a metal plate to improve heat dissipation performance (see, for example, Patent Document 2).

JP 2010-182686 A (Claim 1, FIG. 7) JP 2009-99878 A (Claim 1, FIG. 1)

  In the heat sink of Patent Document 1, the heat radiation efficiency is improved by the heat pipe. However, since it is necessary to connect the heat radiating fin and the heat pipe by welding or the like, the productivity may be reduced. In addition, since the structure of the heat sink is complicated, there is a possibility that the maintainability such as repair may be deteriorated. Furthermore, since the heat pipe is used, there is a problem that the weight and cost of the lighting fixture increase.

  In the heat sink disclosed in Patent Document 2, heat conduction is enhanced by sticking sheet-like graphite to a metal plate. However, since graphite covers the entire heat dissipation surface of the metal plate, heat radiation from the metal plate to the air is performed. There was a risk that the heat dissipation performance would deteriorate. Moreover, since many graphites are required, there existed a problem that cost increased.

  The present invention has been made to solve the above-described problems, and has a simple structure without using a heat pipe, is small in size without increasing the weight of the lighting fixture, and supports a large amount of light of the lighting fixture. An object of the present invention is to provide a lighting heat sink having a high heat dissipation capability and a lighting fixture including the lighting heat sink.

  The heat sink for illumination according to the present invention is provided on a base portion that is in thermal contact with a heat source, a plurality of plate-like heat radiation fins erected on the base portion, and a heat radiation surface of the heat radiation fins, and is more heated than the heat radiation fins. A heat conductive member having high conductivity, and the heat conductive member has a surface in contact with the heat radiating fin formed in an area smaller than the heat radiating surface of the heat radiating fin, and one end is located at a base end portion of the heat radiating fin. And the other end is a shape located in the front-end | tip part of a radiation fin.

  According to the present invention, a heat conductive member having a smaller area than the heat dissipation surface and higher thermal conductivity than the heat dissipation surface is provided on the heat dissipation surface of the heat dissipation fin so as to extend from the base end portion to the tip end portion of the heat dissipation surface. As a result, part of the heat transmitted to the heat radiating fins is diffused to the tip of the heat radiating surface due to heat conduction by the heat conductive member, and heat can be radiated efficiently over the entire heat radiating surface, greatly improving heat dissipation. Can be made. Moreover, since the size of the heat radiation fin can be reduced by increasing the heat radiation efficiency, the weight and cost of the heat sink can be suppressed. A small heat sink having high heat dissipation can be used for a small-sized and high-intensity lighting fixture.

It is a perspective view of the lighting fixture provided with the heat sink for illumination which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the main-body part of the lighting fixture provided with the heat sink for illumination which concerns on Embodiment 1 of this invention. It is the figure which expanded the radiation fin part of the heat sink for illumination which concerns on Embodiment 1 of this invention, Fig.3 (a) is a front view of a radiation fin, FIG.3 (b) is AA of Fig.3 (a). It is the figure which expanded the cross section of the part. It is a figure which shows the modification of the graphite sheet | seat of the heat sink for illumination of FIG. It is a figure which shows the modification of the graphite sheet | seat of the heat sink for illumination of FIG. It is a figure which shows the modification of the graphite sheet | seat of the heat sink for illumination of FIG. It is sectional drawing to which the radiation fin part of the heat sink for illumination which concerns on Embodiment 2 of this invention was expanded.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a lighting fixture including the lighting heat sink according to the first embodiment. FIG. 2 is an exploded perspective view of the main body portion of the lighting fixture including the lighting heat sink according to the first embodiment.

  As shown in FIG. 1, a luminaire 1 includes a main body 2 having a built-in LED (light source), and a lighting device 3 that is electrically connected to the main body 2 by wiring and supplies power to light the LED to the main body 2. With. The main body 2 is inserted into an embedding hole formed in the ceiling or the like and fixed to the ceiling, and the lighting device 3 is installed on the back of the ceiling or the like. The LED is provided in a direction to irradiate light to the lower side of the main body 2, and a heat sink 4 that dissipates heat generated from the LED into the air is provided on the upper portion of the main body 2.

  As shown in FIG. 2, the main body 2 of the luminaire 1 includes a substantially cylindrical frame portion 5 that opens in the vertical direction, a translucent cover 6 that serves as an irradiation surface of the luminaire 1, and a frame portion 5. LED module 7 having an LED that is arranged and emits light in the direction of the irradiation surface, a substrate holder 8 that is arranged between semi-transparent cover 6 and LED module 7 and supports LED module 7, and heat generated by LED module 7 And a heat sink 4 that radiates heat in the air outside the frame portion 5. Three stoppers 9 are provided on the outer peripheral surface of the frame part 5 to fix the main body part 2 to the embedding hole formed in the ceiling or the like, and the three stoppers 9 are arranged in the circumferential direction of the frame part 5. It is arranged at equal intervals.

  The cover 6 is fixed to the frame 5 with screws so as to close the lower opening of the frame 5. The substrate holder 8 is fixed to the base plate 10 of the heat sink 4 (described later) with screws while supporting the LED module 7. The LED module 7 is pressed against the base plate 10 by the substrate press 8 and is in close contact with the heat sink 4. The heat sink 4 is fixed to the frame portion 5 with screws so as to close the upper opening of the frame portion 5 in a state where the LED module 7 is in contact.

  The heat sink 4 includes a disk-shaped base plate 10 (base portion) that contacts the LED module 7, a plurality of plate-shaped heat radiation fins 11 fixed to the upper surface of the base plate 10, and graphite provided on the heat radiation surface of the heat radiation fin 11. A sheet 12 (thermally conductive member). The material of the base plate 10 and the heat radiating fins 11 is aluminum used for a general heat sink. The graphite sheet 12 has a higher thermal conductivity than the base plate 10 and the heat dissipating fins 11 and has a sheet shape.

  The heat radiating fins 11 are formed by bending an aluminum plate into a U shape with a press or the like, and two opposing surfaces formed by bending the aluminum plate into a U shape become heat radiating surfaces for radiating heat into the air. . The lighting fixture 1 shown in FIGS. 1 and 2 is provided with six U-shaped radiating fins 11. Each radiating fin 11 is disposed on the upper surface of the base plate 10 so that the radiating surfaces of the radiating fins are substantially parallel to each other, and is fixed to the base plate 10 with a screw in a state where a surface connecting the opposing radiating surfaces is in contact with the upper surface of the base plate 10. The

  Each radiating fin 11 is formed so that the height of the heat radiating surface (the length from the base end of the heat radiating surface to the tip of the heat radiating surface) is the same when fixed to the base plate 10. In addition, in order to increase the heat radiation area of the heat radiation fin 11 as a whole, a heat radiation fin 11 having a large heat radiation surface is disposed at the center of the circular base plate 10, and a heat radiation fin having a small heat radiation surface outside thereof is disposed. 11 is arranged.

  1 and 2 show the heat radiating fin 11 having a heat radiating surface having a hexagonal shape. However, the present invention is not limited to this, and a polygonal shape other than a hexagonal shape such as a quadrangle or one side having an arc shape. A heat dissipating fin having a bowl shape may be used. A plurality of heat radiation fins 11 having the same heat radiation surface width may be arranged. Furthermore, the number of the radiating fins 11 is not limited to the number shown in FIGS.

  The graphite sheet 12 is provided on the heat radiating surface on the outer side in the U shape of the heat radiating fins 11. Since the heat sink 4 has a structure in which the plurality of heat radiating fins 11 are fixed to the base plate 10, the graphite sheet 12 can be attached to the heat radiating surface of each heat radiating fin 11 before being fixed to the base plate 10. The graphite sheet 12 may also be provided on the inner heat dissipation surface of the U-shaped radiating fin 11, but a separate tool or the like is required for the pasting work because there is an opposite heat dissipation surface. Become.

  3 is an enlarged view of the heat radiation fin portion of the lighting heat sink according to Embodiment 1, FIG. 3 (a) is a front view of the heat radiation fin, and FIG. 3 (b) is an AA view of FIG. 3 (a). It is the figure which expanded the cross section of the part.

  As shown in FIG. 3A, heat radiation fins 11 are provided on the upper surface of the base plate 10, and the LED module 7 serving as a heat source is in contact with the lower surface of the base plate 10. The graphite sheet 12 is provided on the heat radiating surface 11a of the heat radiating fin 11, and is adhered to the heat radiating surface 11a with an adhesive or the like. In addition, about the adhesion method of the graphite sheet 12, you may make it affix the seal-like graphite sheet by which the adhesive agent etc. were apply | coated previously to the heat radiating surface 11a.

  The graphite sheet 12 has a length equal to the height (for example, 50 mm) of the heat radiating surface 11a of the heat radiating fin 11 and a rectangular width (for example, 3 mm) narrower than the width (for example, 40 mm) of the heat radiating surface 11a. It is formed into a shape. And the graphite sheet 12 is affixed on the center part in the width direction of the thermal radiation surface 11a so that it may extend from the base end part 11b of the thermal radiation surface 11a to the front-end | tip part 11c of the thermal radiation surface 11a. Thus, the graphite sheet 12 has a smaller area than the heat radiation surface 11a of the heat radiation fin 11, and the heat radiation surface 11a other than the portion where the graphite sheet 12 is attached is exposed to the air.

  As shown in FIG. 3B, a recess 11d having a width equal to the width of the graphite sheet 12 is formed at the center in the width direction of the heat radiating surface 11a of the radiating fin 11, and the graphite sheet 12 It is affixed to 11d. The concave portion 11d is formed in the heat radiating surface 11a by performing press working with a press machine or the like. Although the recess 11d is not shown in FIG. 3A, a recess 11d similar to the recess 11d shown in FIG. 3B is formed from the base end portion 11b to the tip end portion 11c of the heat radiation surface 11a. ing.

  By forming the concave portion 11d on the heat radiation surface 11a, it becomes easier for the operator to recognize the attachment location of the graphite sheet 12 in the assembly operation, and it is possible to prevent misalignment and attachment error and improve workability. it can. In addition, by attaching the graphite sheet 12 to the recessed portion 11d that is recessed one step, it is difficult to apply a force from the outside to the adhesion surface of the graphite sheet 12 after the attachment, and the peeling of the graphite sheet 12 can be suppressed. Although FIG. 3 shows the radiating fin 11 having the recess 11d, a radiating fin not having the recess 11d may be used.

  Next, a flow until the heat generated in the LED module 7 is radiated into the air by the heat sink 4 will be described. First, heat generated in the LED module 7 is transmitted to the base plate 10 in contact with the LED module 7. The heat transmitted to the base plate 10 is diffused in the surface direction of the base plate 10 and is transmitted to the plurality of heat radiation fins 11 fixed to the upper surface of the base plate 10. The heat transmitted to each radiating fin 11 is conducted from the heat source side (base end portion 11b side) of the radiating fin 11 in a direction away from the heat source (direction toward the distal end portion 11c), and radiated from the radiating surface 11a of the radiating fin 11. Is used to radiate heat into the air.

  Further, since the graphite sheet 12 having a higher thermal conductivity than that of the heat radiation fin 11 is attached to the heat radiation surface 11a of the heat radiation fin 11 linearly from the base end portion 11b to the distal end portion 11c, Apart from the heat conduction, part of the heat transmitted to the radiation fin 11 is transmitted from the base end portion 11b side to the tip end portion 11c side by the heat conduction of the graphite sheet 12. Since the width of the graphite sheet 12 is smaller than the width of the heat radiating surface 11a and most of the heat radiating surface 11a is exposed to the air, the heat conducted to the tip 11c side by the graphite sheet 12 is radiated. The heat is radiated from the heat radiation surface 11a of the fin 11 into the air.

  Here, the graphite sheet 12 has a thermal conductivity of about 1500 W / mK and a thermal conductivity 6 to 10 times that of aluminum, which is the material of the radiation fins 11, but the radiation is not so good. For this reason, as shown in FIG. 3, the radiation surface from the heat radiating surface 11 a is not disturbed by making the attachment surface of the graphite sheet 12 smaller than the heat radiating surface 11 a of the radiating fin 11.

  Thus, by sticking the graphite sheet 12 to the heat radiating surface 11a, heat is transmitted to the vicinity of the tip 11c of the heat radiating surface 11a where heat is not sufficiently transferred only by heat conduction by the heat radiating fins 11 due to heat conduction by the graphite sheet 12. I can tell you. Further, since the graphite sheet 12 extends linearly from the base end portion 11b to the tip end portion 11c of the heat radiating surface 11a, the heat conducting distance is shortened and heat can be efficiently transmitted to the tip end portion 11c. . And since heat is spread | diffused to the whole heat radiating surface 11a, heat can be efficiently radiated in the air from the heat radiating surface 11a. That is, by adhering the graphite sheet 12, the heat radiation efficiency can be increased as compared with the heat radiation fin having the same shape in which the graphite sheet 12 is not provided, and the heat radiation performance can be improved.

  And since heat dissipation improves, it becomes possible to make the radiation fin 11 small, and the weight and cost of the heat sink 4 can be suppressed. Further, even when the diameter of the radiating fin 11 is reduced and the height is increased in order to correspond to a small lighting fixture, heat is conducted by the graphite sheet 12 in the vicinity of the tip portion 11c of the radiating surface 11a. It is possible to prevent a decrease in heat radiation efficiency due to the height of 11 being increased (the distance for conducting heat is increased).

Next, a modified example in which the shape of the graphite sheet 12 is changed will be described.
FIG. 4 is a view showing a modification of the graphite sheet of the lighting heat sink of FIG. The same components as those shown in FIG. As shown in FIG. 4, the graphite sheet 13 has a length (for example, 46 mm) shorter than the height (for example, 50 mm) of the heat radiation surface 11 a of the heat radiation fin 11, and the width (for example, 40 mm) of the heat radiation fin 11. ) In a rectangular shape narrower than (for example, 3 mm). And the graphite sheet 13 is affixed on the center part in the width direction of the thermal radiation surface 11a so that it may extend from the base end part 11b vicinity of the thermal radiation surface 11a to the front-end | tip part 11c vicinity of the thermal radiation surface 11a.

  FIG. 3 shows that the graphite sheet 12 is attached so that one end is located at the base end portion 11b of the heat radiating surface 11a and the other end is located at the front end portion 11c of the heat radiating surface 11a. The graphite sheet 13 is pasted so that the end of the graphite sheet 13 is located at a predetermined distance (for example, 2 mm) from the base end portion 11b and the tip end portion 11c of the heat radiation surface 11a.

  In the case of the radiation fin 11 with the graphite sheet 13 attached, a part of the heat transmitted from the base plate 10 to the radiation fin 11 is transmitted from the radiation surface 11a in the vicinity of the base end portion 11b to the graphite sheet 13, and It is transmitted to the other end side (tip portion 11c side) by heat conduction. Since the other end of the graphite sheet 13 is located in the vicinity of the distal end portion 11c that is separated from the distal end portion 11c of the heat radiating surface 11a by a predetermined distance, the heat transmitted to the other end of the graphite sheet 13 is the distal end portion of the heat radiating surface 11a. 11c is transmitted to the vicinity.

  Thus, if the end of the graphite sheet 13 is located in the vicinity of the base end portion 11b and the tip end portion 11c of the heat radiating surface 11a, the entire heat radiating surface 11a is not required to coincide with the base end portion 11b and the tip end portion 11c. Heat can be diffused. And since length becomes shorter than the graphite sheet 12 of FIG. 3, cost can be suppressed more. In addition, the work of attaching the graphite sheet 13 does not require the work of aligning the end of the graphite sheet 13 with the base end part 11b and the front end part 11c, so that the workability of attaching is improved. Further, as with the heat radiation fin 11 of FIG. 3, the heat radiation performance of the heat radiation fin 11 can be improved, and the heat radiation performance can be improved to reduce the size of the heat radiation fin 11. Can be suppressed. In addition, the recessed part 11d shown in FIG.3 (b) may be similarly provided in the thermal radiation surface 11a of the thermal radiation fin 11 of FIG. 4, and the same effect is acquired.

  FIG. 5 is a view showing a modification of the graphite sheet of the lighting heat sink of FIG. The same components as those shown in FIG. As shown in FIG. 5, the graphite sheet 14 has a length (for example, 46 mm) shorter than the height (for example, 50 mm) of the heat radiation surface 11 a of the heat radiation fin 11 and the width (for example, 40 mm) of the heat radiation fin 11. ) Formed in a shape having a rectangular straight portion 14a that is narrower (for example, 3 mm) and a plurality of rectangular branched portions 14b to 14e extending from the straight portion 14a toward the periphery of the heat radiation surface 11a. Has been.

  Similar to the graphite sheet 13 shown in FIG. 4, the straight portion 14a is affixed to the central portion in the width direction of the heat radiating surface 11a, one end is located near the base end portion 11b of the heat radiating surface 11a, and the other end Is located in the vicinity of the tip 11c of the heat radiating surface 11a. Each of the four branch portions 14b to 14e is attached so that one end is connected to the straight portion 11a and the other end is located in the vicinity of the periphery of the heat radiating surface 11a. Moreover, as for branch part 14b-14e, the edge part located in the periphery vicinity of the thermal radiation surface 11a is a position away from the heat source (LED module 7) rather than the part connected with the linear part 14a.

  In the case of the heat radiating fin 11 with the graphite sheet 14 attached, a part of the heat transferred from the base plate 10 to the heat radiating fin 11 is transferred from the heat radiating surface 11a near the base end portion 11b to the straight portion 14a of the graphite sheet 14. It is transmitted to the other end side (tip portion 11c side) by heat conduction of the graphite sheet 14. A part of the heat transmitted through the straight portion 14a is transmitted to the other end of the straight portion 14a, and a part of the heat is transmitted from the straight portion 14a to each of the branch portions 14b to 14e and is transmitted to the vicinity of the periphery of the heat radiating surface 11a.

  In this way, the graphite sheet 14 has a branched shape, and the graphite sheet 14 is positioned not only in the vicinity of the tip 11a of the heat radiating surface 11a but also in the vicinity of the peripheral edge. Heat is also transmitted to the vicinity of the periphery away from the center of the surface 11a, and the heat can be diffused throughout the heat radiating surface 11a. And since heat radiation to the air is performed on the entire heat radiation surface 11a, the heat radiation efficiency of the heat radiation fins 11 can be further increased, and the heat radiation performance can be further improved. Moreover, it becomes possible to reduce the size of the heat dissipation fin 11 by improving the heat dissipation, and the weight and cost of the heatsink 4 can be suppressed. In addition, the recessed part 11d shown in FIG.3 (b) may be similarly provided in the thermal radiation surface 11a of the thermal radiation fin 11 of FIG. 5, and the same effect is acquired.

  FIG. 6 is a view showing a modification of the graphite sheet of the heat sink for illumination in FIG. The same components as those shown in FIG. As shown in FIG. 6, the graphite sheet 15 has a length (for example, 46 mm) shorter than the height (for example, 50 mm) of the heat dissipation surface 11 a of the heat dissipation fin 11 and the width (for example, 40 mm) of the heat dissipation fin 11. ) And a trapezoidal shape whose width is changed according to the distance from the LED module 7 as a heat source.

  Like the graphite sheet 13 shown in FIG. 4, the graphite sheet 15 is affixed to the central portion in the width direction of the heat radiating surface 11a, one end is located in the vicinity of the base end portion 11b of the heat radiating surface 11a, and the other end Is located in the vicinity of the tip 11c of the heat radiating surface 11a. The graphite sheet 15 has the widest width (for example, 10 mm) at the base end portion 11b side close to the heat source, the width becomes narrower as the distance from the heat source becomes smaller, and the end portion at the front end portion 11c side has the narrowest width ( For example, 2 mm). Although FIG. 6 shows the trapezoidal graphite sheet 15 having a constant change rate of the width dimension, a graphite sheet having a shape in which the change ratio of the width dimension is changed in the middle may be used.

  In heat conduction, the larger the cross-sectional area of the passing object, the larger the heat passing therethrough, so that the heat transmitted through the graphite sheet 15 increases as the width of the graphite sheet 15 increases. Therefore, by increasing the width on the base end portion 11b side near the heat source, a large amount of heat in the vicinity of the base end portion 11b of the heat radiating surface 11a is transmitted to the graphite sheet 15, and a large amount of heat is generated by the heat conduction of the graphite sheet 15. Is conducted to the tip 11c side of the heat radiating surface 11a. Then, as the heat transmitted through the graphite sheet 15 approaches the tip portion 11c side, the heat transmitted through the graphite sheet 15 is gradually reduced by being transmitted to the heat radiating surface 11a. The exposed area of the surface 11a is increased to increase the amount of heat released by radiation of the heat radiating surface 11a.

  As described above, since the efficient heat conduction is performed by changing the width dimension of the graphite sheet 15 according to the distance to the heat source, the heat radiation efficiency of the heat radiation fin 11 can be further increased. The heat dissipation performance can be further improved. And since heat dissipation improves, it becomes possible to make the radiation fin 11 small, and the weight and cost of the heat sink 4 can be suppressed. Moreover, the recessed part 11d shown in FIG.3 (b) may be similarly provided in the thermal radiation surface 11a of the thermal radiation fin 11 of FIG. 6, and the same effect is acquired.

Embodiment 2. FIG.
FIG. 7 is an enlarged cross-sectional view of the radiation fin portion of the lighting heat sink according to the second embodiment. Note that the lighting heat sink of the second embodiment can be employed in a lighting fixture in the same manner as the lighting heat sink of the first embodiment, and a description thereof will be omitted. Also, the same components as those shown in FIG.

  As shown in FIG. 7, the lighting heat sink of Embodiment 2 is fixed to the upper surface of the base plate 10 with the LED module 7 in contact with the lower surface, and has two radiating fins 11 formed in a U-shape, and radiating fins. 11 and a graphite sheet 16 sandwiched between the heat radiating surfaces 11e on the outside. Both surfaces of the graphite sheet 16 are bonded to the heat radiating surface 11e of the heat radiating fins 11 with an adhesive or the like. The shape of the graphite sheet 16 may be any of the graphite sheets 12 to 15 shown in FIGS. 3 to 6, or may be a graphite sheet having the same shape as the shape of the heat dissipation surface 11 e.

  By sandwiching the graphite sheet 16 between the two radiating fins 11, a part of the heat transferred from the base plate 10 to the radiating fin 11 is transferred to the entire radiating surface 11e by the heat conduction of the graphite sheet 16 provided between the radiating surfaces 11e. Distributed. And the heat transmitted to the heat radiating surface 11e can be radiated in the air using the radiation of the heat radiating surface 11f which is the inner side of the U-shaped radiating fin 11. Thus, the heat dissipation efficiency of the heat dissipation fin 11 can be increased, and the heat dissipation can be improved. And since heat dissipation improves, it becomes possible to make the radiation fin 11 small, and the weight and cost of the heat sink 4 can be suppressed.

  Note that the recess 11d shown in FIG. 3B may be provided in the same manner on the heat radiating surface 11e of the heat radiating fin 11 shown in FIG. 7, and the same effect can be obtained. Although FIG. 7 shows a case where there are two radiating fins 11, three or more radiating fins 11 may be provided. In that case, the radiating surface 11 e that is the outer side of the U-shaped adjacent radiating fin 11. The graphite sheet 16 may be sandwiched between them.

  Here, in Embodiments 1 and 2, the graphite sheets 12 to 16 having a higher thermal conductivity than the aluminum base plate 10 and the radiation fins 11 have been described. However, as a thermal conductive member provided on the radiation fins 11, a graphite sheet is used. Instead of 12, a metal material such as copper having a higher thermal conductivity than aluminum can be adopted, and the same effect can be obtained. In this case, a metal plate such as copper may be processed into a predetermined shape in advance, and the processed metal plate may be fixed to the heat radiating surface 11a of the radiating fin 11 by adhesion or the like, but the graphite sheets 12 to 16 are more preferable. Since it is in the form of a sheet, it can be easily processed into a predetermined shape.

  In the first and second embodiments, the heat sink 4 in which a plurality of heat radiating fins 11 formed by bending an aluminum plate into a U-shape by a press or the like is fixed to the base plate 10 has been described. It is also possible to employ a heat sink (one in which the radiating fin and the base plate are integrated), and the same effect can be obtained. In this case, a graphite sheet may be attached to the heat radiating surface of the heat radiating fin as in FIGS. 3 to 7, but since the heat radiating fin and the base plate are integrated, a separate tool or the like is required for the attaching operation. Alternatively, the workability of the pasting work is improved by increasing the thickness of each heat radiation fin to reduce the number of heat radiation fins and widen the space between the heat radiation fins.

DESCRIPTION OF SYMBOLS 1 Lighting fixture, 2 main body, 3 lighting device, 4 heat sink (heat sink for illumination), 5 frame, 6 cover, 7 LED module (light source module), 8 board holder, 9 stopper, 10 base plate (base part), 11 heat dissipation Fin, 11a Heat radiation surface, 11b Base end portion, 11c Tip end portion, 11d Recessed portion, 12 Graphite sheet (thermally conductive member), 13 Graphite sheet, 14 Graphite sheet, 14a Linear portion, 14b-14e Branch portion, 15 Graphite sheet, 16 Graphite sheet.

Claims (10)

A base in thermal contact with a heat source;
It has a plate shape with a heat radiating surface on both sides, with one end serving as the base end of the heat radiating surface being in contact with the base and spaced so that the other end serving as the tip of the heat radiating surface is open. A plurality of radiating fins erected on the base portion;
A heat conductive member attached to at least one of the heat radiating surfaces of the heat radiating fin, and suppressing heat dissipation of the heat radiating fin and having a higher thermal conductivity than the heat radiating fin;
In the state where the heat conductive member is attached to the one heat radiating surface , one end is located at a base end portion of the one heat radiating surface , and the other end is located at a distal end portion of the one heat radiating surface , A heat sink for illumination, wherein the heat sink has a shape in which a part of one heat radiation surface is exposed . A base in thermal contact with a heat source;
It has a plate shape with a heat radiating surface on both sides, with one end serving as the base end of the heat radiating surface being in contact with the base and spaced so that the other end serving as the tip of the heat radiating surface is open. A plurality of radiating fins erected on the base portion;
A heat conductive member attached to at least one of the heat radiating surfaces of the heat radiating fin, and suppressing heat dissipation of the heat radiating fin and having a higher thermal conductivity than the heat radiating fin;
In the state where the heat conductive member is attached to the one heat radiating surface , one end is located in the vicinity of the base end portion spaced apart from the base end portion of the one heat radiating surface , and the other end is the one heat radiating surface. An illumination heat sink, wherein the illumination heat sink has a shape that is located in the vicinity of a tip portion that is separated from the tip portion of the surface by a predetermined distance and that exposes a part of the one heat radiation surface . 3. The heat sink for lighting according to claim 1, wherein the heat conductive member is smaller than an area where the one heat radiating surface is exposed. 4. Wherein the thermally conductive member may be any of claims 1 to 3, characterized in that it comprises a straight portion extending substantially straight from the proximal end side of the heat radiation surface to the tip portion side of the heat radiating surface The heat sink for illumination according to one item . The heat sink for lighting according to claim 4, wherein the heat conductive member has a branch portion extending from the straight portion toward a peripheral edge of the heat radiating surface . 5. The heat sink for illumination according to claim 1, wherein the heat conductive member has a shape that increases in width as it approaches the base end side of the heat radiating surface . 6. The said heat conductive member is pinched | interposed into two said radiation fins, and both surfaces of the said heat conductive member are contacting the said radiation fin, The said any one of Claim 1-6 characterized by the above-mentioned. Heat sink for lighting. It said recess adapted to the shape of the thermally conductive member on the heat radiation surface of the heat radiation fins are formed, one of claims 1 to 7, characterized in that said thermally conductive member is provided in the recess A heat sink for lighting according to claim 1 . The heat sink for illumination according to any one of claims 1 to 8, wherein the heat conductive member is a graphite sheet. A frame,
A light source module disposed within the frame and having a light source serving as a heat source;
The lighting fixture provided with the heat sink for illumination as described in any one of Claims 1-9 which contacted the said light source module thermally.

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