JP5463102B2 - Bonded heat sink - Google Patents

Description

The present invention uses et is to dissipate heat generated from the light emitter such as a light emitting diode, to a junction heat sink formed by joining a pair of heat sink mirror symmetry.

  A light emitting device or the like that generates heat is provided with a heat sink made of a metal material having excellent thermal conductivity and a structure having a large surface area. The heat sink can dissipate heat to lower the ambient temperature, and is used to prevent performance deterioration due to temperature rise in a light emitting device or the like.

  In recent years, light-emitting diodes have been widely used as light-emitting devices such as lighting fixtures in place of incandescent bulbs. Light emitting diodes are expected to have a long life because they generate little heat and do not use filaments. However, although the light emitting diode generates little heat, it has a characteristic that it is vulnerable to heat. If the temperature is high, the element itself may be deteriorated and the life may be shortened. Therefore, in a light emitting device using a light emitting diode, it is required to install a heat sink that is particularly excellent in heat dissipation.

A heat sink having a substrate portion and a plurality of protruding portions protruding from the substrate portion is used in order to increase the surface area and improve heat dissipation (see Patent Document 1).
As such a heat sink, a casting made by pouring a metal material such as aluminum or copper having excellent thermal conductivity into a mold is widely used.

JP 2008-226708 A

  However, the heat sink formed by casting has a problem that the weight increases and the cost of the material itself increases. Moreover, in the use of lighting fixtures, such as a downlight used by attaching to a ceiling, the weight reduction of a product is requested | required in order to prevent the fall by dead weight. In recent years, light-emitting diodes are also used in lighting fixtures such as downlights, and development of heat sinks that combine excellent heat dissipation and light weight is required for such applications.

The present invention was made in view of the above problems, in which excellent heat dissipation can be shown, and seeks to provide a junction-type heat sink that can be made lighter.

The present invention, we used to dissipate heat generated from the light emitter is, a bonding heat sink formed by joining the heat sinks to each other,
The heat sink includes a substrate surface portion disposed on the light emitter side, and a heat dissipation portion having an uneven structure formed on the substrate surface portion,
The substrate surface portion and the heat dissipation portion are formed by bending a single aluminum alloy plate ,
The heat dissipating part has an upright surface that stands up in a substantially vertical direction from the substrate surface portion, and a top plate surface that extends in a direction substantially parallel to the substrate surface portion from the upstanding surface and in a direction in which an orthogonal projection onto the substrate surface portion overlaps the substrate surface portion. A descending surface that descends in a substantially vertical direction from the top plate surface to the substrate surface portion, and a bottom plate surface that extends from the descending surface in a direction that is substantially parallel to the substrate surface portion and does not overlap the orthogonal projection of the top plate surface. Has a convex body,
The heat radiating portion has one or two or more convex bodies composed of the standing surface, the top plate surface, the descending surface, and the bottom plate surface. Are connected to each other on one of the bottom plate surface and the other standing surface,
At least a part of the convex body is formed with a through-hole penetrating the aluminum alloy plate constituting the convex body,
A joining type heat sink is characterized in that the two heat sinks, which are a pair of mirror bodies in a mirror-symmetrical relationship, are joined at the upright surfaces .

In the bonded heat sink of the present invention, the substrate surface portion and the heat radiating portion are formed by bending one aluminum alloy plate. That is, the substrate surface portion and the heat radiating portion are formed from a single plate.
Therefore, the heat sink can be easily reduced in weight by appropriately selecting the thickness of the aluminum alloy plate. Therefore, the junction heat sink is suitable for applications that require a lighter product such as a downlight. Further, the heat sink can be easily formed by bending as described above.

Further, the heat sink has the heat radiating portion having the concavo-convex structure. Therefore, the surface area of the heat sink can be increased, and the heat sink can exhibit excellent heat dissipation.
Further, since the heat sink is formed by bending the aluminum alloy plate as described above, it is easier to form the uneven structure having a larger surface area than a conventional heat sink made of a casting of substantially the same size. The contact area with the surrounding outside air can be increased. Therefore, the heat sink can exhibit excellent heat dissipation even with a relatively small size.

Thus, according to the present invention, it is possible to provide a bonded heat sink that can exhibit excellent heat dissipation and can be reduced in weight.

The perspective view of the joining type heat sink concerning an Example. The front view of the joining type heat sink concerning an Example. The left view of the joining type heat sink concerning an Example. The top view of the joining type heat sink concerning an Example. The bottom view of the joining type heat sink concerning an Example. The perspective view which shows a mode that the 1st heat sink (2nd heat sink) concerning an Example was observed from the descending surface side diagonally upward. The perspective view which shows a mode that the 1st heat sink (2nd heat sink) concerning an Example was observed from the standing surface side diagonally upward. The front view of the 1st heat sink (2nd heat sink) concerning an Example. The right view (side view observed from the standing surface side) of the 1st heat sink (2nd heat sink) concerning an Example. The top view of the 1st heat sink (2nd heat sink) concerning an Example. The bottom view of the 1st heat sink (2nd heat sink) concerning an example. The top view of the aluminum alloy plate concerning an Example.

Next, a preferred embodiment of the present invention will be described.
In the present invention, the heat sink is formed by bending the aluminum alloy plate, and the aluminum alloy plate having a thickness of 0.8 to 3 mm, for example, can be used.
If the thickness of the aluminum alloy plate is less than 0.8 mm, the heat sink may not have sufficient strength. On the other hand, if it exceeds 3 mm, the weight of the heat sink increases, and the above-described superiority in forming from the aluminum alloy plate may be reduced. In this case, bending may be difficult. More preferably, it is 1.0-2.5 mm, More preferably, 1.0 mm-2.0 mm is good.

Further, as the aluminum alloy, it is preferable to use a 1000 series or 6000 series aluminum alloy.
In this case, the heat dissipation of the heat sink can be further improved by taking advantage of the excellent thermal conductivity of the 1000 series aluminum alloy or the 6000 series aluminum alloy.
From the viewpoint of bending workability, it is preferable to use a 1000 series aluminum alloy or a 6000 series aluminum alloy. Therefore, it becomes possible to bend and process a thick aluminum alloy plate easily and accurately, and the heat sink can be easily formed. .
In this specification, the 1000 series aluminum alloy is a concept including pure aluminum.

In the heat sink, the heat radiating portion is a standing surface that stands substantially vertically from the substrate surface portion, and a direction in which an orthogonal projection from the standing surface to the substrate surface portion is substantially parallel to the substrate surface portion and overlaps the substrate surface portion. A top surface extending from the top surface to the substrate surface portion in a direction substantially perpendicular to the substrate surface portion, and a direction substantially parallel to the substrate surface portion from the descending surface and not overlapping the orthogonal projection of the top surface. It is preferable to have a convex body composed of an extending bottom plate surface .
In this case, the convex body having a space surrounded by the substrate surface portion, the standing surface, the top plate surface, and the descending surface can be formed. For this reason, the contact area between the heat sink and the ambient air is increased, and the heat dissipation of the heat sink can be further improved.

Further, the surface area can be further increased by forming at least the standing surface, the top plate surface, or the descending surface with a structure that is not flat but uneven. In this case, the heat dissipation of the heat sink can be further improved.
The standing surface, the top plate surface, and the descending surface are, for example, a region for forming the standing surface, a region for forming the top plate surface, and a region for forming the descending surface in an aluminum alloy plate before bending. It can be formed by processing it into a concavo-convex shape in advance. In addition, an uneven structure can be formed after the bending process.

The heat radiating portion has one or two or more convex bodies composed of the standing surface, the top plate surface, the descending surface, and the bottom plate surface. It is preferable that one bottom plate surface and the other standing surface are connected to each other .
When two or more convex bodies are provided, the surface area of the heat sink can be increased. Therefore, the heat dissipation of the heat sink can be improved.
Moreover, when it has two or more said convex bodies, in two adjacent said convex bodies, it shall be the structure which one convex body, the said baseplate surface, and the said other standing surface mutually connect. Can do. In this case, the plurality of convex bodies can be formed from one aluminum alloy plate by bending the aluminum alloy plate.

That is, in the case of having a plurality of convex bodies, the first convex body includes an upright surface (first upright surface) that stands up in a substantially vertical direction from the substrate surface portion, and the substrate from the first upright surface. A top plate surface (first top plate surface) extending in a direction substantially parallel to the surface portion and orthogonal to the substrate surface portion, and descending in a substantially vertical direction from the first top plate surface to the substrate surface portion. A descending surface (first descending surface) that extends from the first descending surface in a direction that is substantially parallel to the substrate surface portion and does not overlap the orthogonal projection of the top plate surface (first top plate surface). Bottom plate surface). The second convex body includes an upright surface (second upright surface) that stands up in a substantially vertical direction from the first bottom plate surface, and a positive direction from the second upright surface in a direction substantially parallel to the substrate surface portion and toward the substrate surface portion. A top plate surface (second top plate surface) extending in a direction in which the projection overlaps the substrate surface portion, a descending surface (second descending surface) descending in a substantially vertical direction from the second top plate surface to the substrate surface portion, It consists of a bottom plate surface (second bottom plate surface) extending from the second descending surface in a direction substantially parallel to the substrate surface portion and not overlapping with the orthogonal projection of the top plate surface (second top plate surface). Further, the same applies to the third convex body, the fourth, the fifth, and so on.
The plurality of convex bodies having such a configuration can be formed from a single aluminum alloy plate by bending.

It is preferable that a through-hole penetrating the aluminum alloy plate constituting the convex body is formed in at least a part of the convex body .
In this case, in the heat sink, the fluidity of the outside air into the space surrounded by the substrate surface portion, the standing surface, the top plate surface, and the descending surface can be improved. Therefore, the heat dissipation of the heat sink can be further improved.
In addition, in the case where two heat sinks that are a pair of mirror bodies having a mirror-symmetrical relationship as described later are joined with the upright surfaces by screws or the like, by adjusting the formation positions of the through holes and screw holes, The through hole can also be used as an insertion port for inserting a tool or the like.

It is preferably bonded to the above bottom plate surface and the substrate surface (claim 2).
In this case, the structure of the convex body composed of the upright surface, the top plate surface, the descending surface, and the bottom plate surface can be maintained. The bottom plate surface and the substrate surface portion can be joined together with, for example, screws.

In the heat sink, orthogonal projection to the substrate surface of the top plate surface is preferably within the substrate surface (claim 3). That is, it is preferable that the orthogonal projection of the top plate surface onto the substrate surface portion does not protrude from the substrate surface portion.
In this case, when assuming a columnar body having the substrate surface portion as the bottom surface and extending in the top plate surface direction, the outer shape of the top plate surface does not protrude from the columnar body. Therefore, it is possible to deal with applications in which the shape of the heat sink is limited, such as a heat sink for a lighting fixture.

The aluminum alloy plate has a substrate surface region that forms the substrate surface portion, and a convex body forming region that extends from the substrate surface region, and the convex body forming region is in order from the substrate surface region side in order. A rising surface region that forms a rising surface, a top plate surface region that is connected to the rising surface region and forms the top plate surface, a descending surface region that is connected to the top plate surface region and forms the falling surface, and the falling surface consists of a bottom plate surface area for forming the bottom plate surface contiguous to the area, the heat sink, the aluminum alloy plate, it is preferably formed by mountain-folding or valley fold at the boundary of each region (claim 4 ).
In this case, the convex body can be easily formed on the substrate surface portion from one aluminum alloy plate, and the heat sink can be easily formed.

In the case where the aluminum alloy plate has one or two or more convex body forming regions composed of the standing surface region, the top plate surface region, the descending surface region, and the bottom plate surface region. in is preferably continuous with each other in the convex formation region and one of said bottom plate surface area and the other the rising surface region (claim 5).
When the aluminum alloy plate having two or more convex body forming regions is used, two or more convex bodies can be formed from one aluminum alloy plate.

A plurality of heat sinks can be bonded to form a bonded heat sink.
In this case, by joining the heat sink having the convex shape, it is possible to obtain a plurality of the joint heat sinks having the convex shape.
Therefore, it is possible to configure the above joint type heat sink having a large specific surface area and excellent heat dissipation.

Moreover, it is preferable that the said joining type heat sink joins the said 2 heat sink used as a pair of mirror surface body in a mirror-symmetrical relationship by the said standing surfaces .
In this case, since it has joined the two heat sinks in a mirror symmetrical relationship in the symmetry plane, as a whole heating tosylate link after bonding, becomes symmetrical with respect to the plane of symmetry. Therefore, it becomes easy to deal with products whose installation shape of the heat sink is predetermined. The heat sink can be joined between the standing surfaces that stand from the substrate surface portion.

Further, the bonding heat sink is preferably applied to a light emitting diode (claim 6).
In this case, it is possible to remarkably make use of the function and effect exhibited by the joint heat sink that can reduce the weight while exhibiting excellent heat dissipation.

Example 1
Next, an embodiment of the present invention will be described with reference to FIGS.
In this example, a pair of heat sinks having a mirror surface object relationship are manufactured, and a bonded heat sink formed by bonding them is manufactured.
1 to 5 show the junction type heat sink of this example. 1 to 5 are a perspective view, a front view, a side view (left side view), a plan view, and a bottom view, respectively, of the bonded heat sink of this example. The rear view is omitted because it has the same shape as the front view, and the right side view is omitted because it is mirror-symmetrical with the left side view.

As shown in FIGS. 1 to 5, the bonded heat sink 1 of this example includes a disk-shaped substrate surface portion 10 and a heat dissipation portion 15 having a concavo-convex structure formed thereon.
In this example, the junction type heat sink 1 is formed by joining two heat sinks 2 and 3 serving as a pair of mirror bodies having a mirror-symmetrical relationship between standing surfaces 261 and 361. Each of the pair of heat sinks 2 and 3 in the mirror body relation has substrate surface portions 20 and 30 and heat radiation portions 25 and 35, and each can be used alone as a heat sink.
In this example, in order to avoid confusion, a pair of heat sinks having a mirror-symmetrical relationship is appropriately referred to as a first heat sink 2 and a second heat sink 3, respectively.

  6 to 11 show the heat sinks 2 and 3 (first heat sink 2 and second heat sink 3). FIGS. 6 to 11 are perspective views of the first heat sink 2 (second heat sink 3) as viewed from the front and obliquely upward from the left, a perspective view from the rear and obliquely upward from the left, a front view, and a side view (right side). Plane view), a plan view, and a bottom view. The back view is omitted because it is the same shape as the front view, and the left side view is omitted because it is the same shape as FIG.

  As shown in FIGS. 6 to 11, the first heat sink 2 and the second heat sink 3 are formed by bending a single aluminum alloy plate made of 1100-H24 (JIS H 4000, JIS H 0001). In each heat sink 2, 3, the heat radiating portions 25, 35 are upright surfaces 261, 361 erected in a substantially vertical direction from the semi-disc-shaped substrate surface portions 20, 30, and from the upright surfaces 261, 361 And the top plate surfaces 262 and 362 extending in a direction X (see FIG. 8) in which the orthogonal projection onto the substrate surface portions 20 and 30 overlaps the substrate surface portions 20 and 30, and the top plate surfaces 262 and 362 The descending surfaces 263 and 363 descend in a substantially vertical direction to the substrate surface portions 20 and 30, and the descending surfaces 263 and 363 are substantially parallel to the substrate surface portions 20 and 30 and do not overlap the orthogonal projection of the top plate surfaces 262 and 362. Convex bodies 26 and 36 having bottom plate surfaces 264 and 364 extending in the direction X are provided.

Hereinafter, the first heat sink 2 will be described in detail as an example.
The first heat sink 2 has two convex bodies 26 and 27. The convex bodies 26 and 27 are connected to each other on the bottom plate surface 264 of one convex body 26 and the standing surface 271 of the other convex body 27. That is, the standing surface 271 of the convex body 27 is formed so as to stand in a substantially vertical direction from the bottom plate surface 264 of the convex body 26. Further, in the convex body 27 as well as the convex body 26, a top plate surface 272 extending from the upright surface 271 in the direction X, a descending surface 273 descending from the top plate surface 272 to the substrate surface portion 20 in a substantially vertical direction, A bottom plate surface 274 extending in the direction X from the descending surface 273 is formed. In this example, the descending surfaces 263 and 273 reach the substrate surface portion 20, and the bottom plate surfaces 264 and 274 are in contact with the substrate surface portion 20.
In the first heat sink 2, screw holes are provided in contact portions between the bottom plate surfaces 264 and 274 and the substrate surface portion 20, and the bottom plate surfaces 264 and 274 and the substrate surface portion 20 are joined by screws 19 (FIG. 6 and FIG. 8).

The second heat sink 3 is mirror-symmetrical with the first heat sink and has the same configuration as the first heat sink 1.
The first heat sink and the second heat sink are symmetrical with respect to the rising surfaces 261 and 361 rising from the substrate surface portions 20 and 30, and the first heat sink 2 and the second heat sink 3 are raised as shown in FIGS. The surfaces 261 and 361 are bonded to each other to form a bonded heat sink bonded heat sink 1.

Moreover, two through holes 265 and 266 are formed in the convex body 26 of the first heat sink 2 so as to penetrate the aluminum alloy plate constituting the first heat sink 2 (see FIGS. 6, 7, and 10). The through holes 265 and 266 are formed at a boundary portion between the top plate surface 262 and the descending surface 263, and are formed from the boundary portion to a region extending from the top plate surface 262 and the descending surface 263.
Further, the other convex body 27 of the first heat sink 2 is formed with two through holes 275 and 276 that penetrate through the aluminum alloy plate constituting the same. The through holes 275 and 276 are formed at the upper end of the standing surface 271.

These through holes 265, 266, 275, and 276 are formed in the standing surfaces 261 and 361 when the first heat sink 2 and the second heat sink 3 are joined to each other by using screws with the standing surfaces 261 and 361. It corresponds to the position of the screw holes 135, 436. Therefore, when joining the 1st heat sink 2 and the 2nd heat sink 3 with a screw, it can join by inserting a tool in penetration holes 265, 266, 275, and 276.
Similarly to the first heat sink 2, through holes 365, 366, 375, and 376 are formed in the second heat sink 3.

  The first heat sink 2 and the second heat sink 3 that are in a mirror-symmetrical relationship are formed with screw holes 435 and 436 in standing surfaces 261 and 361 that stand from the substrate surface portions 20 and 30 (see FIGS. 7 and 9). The surfaces 261 and 361 are joined by screws 19 to form a joining heat sink 1 (see FIGS. 1 to 5).

  In this example, both the first heat sink 2 and the second heat sink 3 are formed by bending a single aluminum alloy plate. In this example, a 1.5 mm-thick aluminum alloy plate 4 having the shape shown in FIG. 12 is produced by punching, and the heat sinks 2 and 3 are formed using this aluminum alloy plate 4.

  That is, the aluminum alloy plate 4 includes a substrate surface portion forming region 40 for forming the substrate surface portion 20, a first convex body forming region 41 and a second convex body forming region 42 extending from the substrate surface portion forming region 40. Have The convex body forming region 41 includes, in order from the substrate surface portion forming region 40 side, an upright surface forming region 411 that forms the upstanding surface 261 (361) and a top plate surface forming region that forms the top plate surface 262 (362). 412, a descending surface forming region 413 that forms the descending surface 263 (363), and a bottom plate surface forming region 414 that forms the bottom plate surface 264 (364) (see FIGS. 12 and 6 to 11). The convex body forming region 42 forms the upstanding surface 271 (371), and the upstanding surface forming region 421 that continues to the bottom plate surface forming region 414, and the top plate surface forming region 422 that forms the top plate surface 272 (372). And a descending surface forming region 423 for forming the descending surface 273 (373) and a bottom plate surface forming region 424 for forming the bottom plate surface 274 (374).

  As shown in FIG. 12, in this example, the substrate surface forming area 40 has a semi-disc shape, and the convex body forming areas 41 and 42 extend from the diameter portion of the semi-disc shape with a width smaller than the diameter. Specifically, the upright surface forming region 411 extends from the semi-disc-shaped substrate surface forming region 40 with a width smaller than the diameter portion, and further, the upright surface forming region 411 and the top plate surface forming region 412 with the same width as this. The descending surface forming region 413 extends. Further, the bottom plate surface forming region 414 extends from the descending surface forming region 413. In the bottom plate surface forming region 414, one end in the width direction is inclined to form a tapered portion, and the width of the bottom plate surface forming region 414 decreases as the distance from the descending surface forming region 413 increases.

Further, the standing surface forming region 421 extends from the bottom plate surface forming region 414 with the same width as the end portion in the longitudinal direction. A top plate surface forming region 422 extends from the standing surface forming region 421. In the top plate surface forming region 422, both end portions in the width direction are inclined to form tapered portions, and the width of the top plate surface forming region 422 becomes smaller as the distance from the upright surface forming region 421 increases. Further, the descending surface forming region 423 extends from the top plate surface forming region 422 with the same width as the end portion in the longitudinal direction. At both ends in the longitudinal direction of the descending surface forming region 423, both end portions in the width direction are inclined to form a tapered portion, and the width of the descending surface forming region 423 in the tapered portion becomes closer to the bottom plate surface forming region 424. It is getting smaller. A bottom plate surface forming region 424 extends from the descending surface forming region 423 with the same width as the end portion in the longitudinal direction.
The longitudinal direction described above is a direction in which the convex body forming regions 41 and 42 extend from the substrate surface portion forming region 20, and the width direction is a direction perpendicular to the longitudinal direction.

In addition, screw holes 431, 432, 433, 434, 435, 436, 437, 438, 439, and 440 are formed in the substrate surface portion forming region 40, the standing surface forming region 411, and the bottom plate surface forming regions 414 and 424. .
The screw holes 433 and 434 formed in the substrate surface portion forming region 40 are formed at positions corresponding to the screw holes 437 and 438 formed in the bottom plate surface forming region 414 after the bending process. Further, the screw holes 431 and 432 formed in the substrate surface forming region 40 are formed at positions corresponding to the screw holes 439 and 440 formed in the bottom plate surface forming region 424 after the bending process.
Further, the screw holes 435 and 436 formed in the upright surface forming region 411 are used when the first heat sink and the second heat sink formed after the bending process are joined between the upright surfaces.

The aluminum alloy plate 4 having such a shape has a boundary portion 451 between the substrate surface portion formation region 40 and the upright surface formation region 411, a boundary portion 452 between the upright surface formation region 411 and the top plate surface formation region 412, and a top plate surface formation region. 412 and the falling surface forming region 413, the rising surface forming region 421 and the top surface forming region 422, and the top surface forming region 422 and the falling surface forming region 423. Fold approximately 90 degrees. On the other hand, the boundary portion 454 between the descending surface forming region 413 and the bottom plate surface forming region 414, the boundary portion 455 between the bottom plate surface forming region 414 and the standing surface forming region 421, and the descending surface forming region 423 and the bottom plate surface forming region 424 The boundary portion 458 is folded at approximately 90 ° valley.
In this way, the first heat sink 2 can be manufactured as shown in FIGS. In the first heat sink 2, the bottom plate surfaces 264 and 274 and the substrate surface portion 20 are joined and fixed with screws.

The second heat sink 2 having a mirror-symmetrical relationship with the first heat sink is prepared with an aluminum alloy plate having the same shape as that of the aluminum alloy plate used for the production of the first heat sink 1. It can be produced by replacing the valley folds and performing the bending process. That is, approximately 90 ° valley folding is performed at the boundary portions 451, 452, 453, 456, and 457, and approximately 90 ° mountain folding is performed at the boundary portions 454, 455, and 458 (see FIG. 12).
In this way, a pair of heat sinks (first heat sink and second heat sink) 2 and 3 having a mirror symmetry relationship can be produced.

Next, the heat sinks 2 and 3 were brought into contact with each other at the standing surfaces 261 and 361 standing from the substrate surface portion 20 and joined by screws 19 (see FIGS. 1, 2, and 4).
As shown in FIG. 1 to FIG. 5, semi-disc-like substrate surface portions 20 and 30 are joined at their diameter portions to form a disc-shaped substrate surface portion 10, and unevenness is formed on the substrate surface portion 10. A heat radiating portion 15 having a plurality of structures is formed. In this way, the bonded heat sink 1 can be manufactured.

As shown in FIGS. 6 to 11, the heat sinks 2, 3 of this example have substrate surface portions 20, 30, and heat dissipation portions 25, 35 having a concavo-convex structure formed on the substrate surface portions 20, 30. The substrate surface portions 20 and 30 and the heat radiation portions 25 and 35 are formed by bending a single aluminum alloy plate.
Therefore, it is possible to easily reduce the weight of the heat sinks 2 and 3 by appropriately selecting the thickness of the aluminum alloy plate. Therefore, the heat sinks 2 and 3 are suitable for applications that require a lighter product, such as downlights. The heat sinks 2 and 3 can be easily produced by bending the aluminum alloy plate as described above.

Moreover, the heat sinks 2 and 3 have heat radiating portions 25 and 35 having an uneven structure. Further, the heat sinks 2 and 3 employ aluminum alloy plates made of 1000 series aluminum alloy having excellent thermal conductivity.
Therefore, the heat sinks 2 and 3 can exhibit excellent heat dissipation.

  The heat sinks 2 and 3 are formed by bending the aluminum alloy plate 4 as described above. Therefore, compared with a conventional heat sink made of a casting of substantially the same size, the uneven structure having a larger surface area can be easily formed, and the contact area with the surrounding outside air can be increased. Therefore, the heat sink 1 can exhibit excellent heat dissipation even with a relatively small size.

  In this example, the two heat sinks 2 and 3 (the first heat sink 2 and the second heat sink 3), which are a pair of mirror bodies having a mirror-symmetrical relationship, are joined to each other by the standing surfaces 261 and 361. 1 is formed. Such a junction heat sink 1 can exhibit the same effects as the heat sinks 2 and 3.

Further, by using the bonded heat sink 1, a heat sink having a large surface area and having a plurality of convex bodies 26, 27, 36, and 37 can be easily formed.
Moreover, in the junction type heat sink 1, since the two heat sinks 2 and 3 which are mirror-symmetrical are joined by the symmetry plane, the junction type heat sink 1 as a whole is symmetrical with the symmetry plane in between. Therefore, it becomes easy to deal with products in which the installation shape of the heat sink is predetermined.

Further, in each heat sink 2, 3, the heat radiating portions 25, 35 are substantially the same as the substrate surface portions 20, 30 from the standing surfaces 261, 361 standing upright from the substrate surface portions 20, 30 and the standing surfaces 261, 361. The top plate surfaces 262 and 362 extend in a direction parallel to and orthogonal to the substrate surface portions 20 and 30, and descend from the top plate surfaces 262 and 362 to the substrate surface portions 20 and 30 in a substantially vertical direction. Convex shape composed of descending surfaces 263 and 363 that extend, and bottom plate surfaces 264 and 364 that extend from the descending surfaces 263 and 363 in a direction that is substantially parallel to the substrate surface portions 20 and 30 and does not overlap with the orthogonal projection of the top plate surfaces 262 and 362. It has the bodies 26 and 36 (refer FIGS. 6-11). That is, the convex bodies 26 and 36 having a space surrounded by the substrate surface portions 20 and 30, the standing surfaces 261 and 361, the top plate surfaces 262 and 362, and the descending surfaces 263 and 363 can be formed. Therefore, the contact area between the heat sink 1 and the surrounding air is increased, and the heat dissipation of the heat sinks 2 and 3 can be further improved.
Moreover, in this example, since the heat sinks 2 and 3 have the some convex-shaped bodies 26, 27, 36, and 37, the surface area of a heat sink can be enlarged more. Therefore, the heat dissipation of the heat sink can be further improved.

In addition, through holes 265, 266, 275, 276, 365, 366, 375, and 376 are formed in at least a part of the convex bodies 26, 27, 36, and 37 so as to penetrate the aluminum alloy plate constituting the convex bodies. Yes.
Therefore, in each heat sink 2, 3, the fluidity of air into the space of the convex bodies 26, 27, 36, 37 can be improved. Therefore, the heat dissipation of the heat sinks 2 and 3 can be further improved. In addition, when the two heat sinks 2 and 3 that are a pair of mirror bodies having a mirror-symmetrical relationship are joined to each other by the screws 19 between the standing surfaces 261 and 361, as insertion holes for inserting tools or the like, through holes 265, 266, 275, 276, 365, 366, 375, 376 can also be used.
Further, since the bottom plate surfaces 264, 274, 364, 374 and the substrate surface portions 20, 30 are joined by screws, the structure of the convex bodies 26, 27, 36, 37 can be maintained.

  In each heat sink 2, 3, the orthogonal projection of the top plate surfaces 262, 272, 362, 372 onto the substrate surface portions 20, 30 is in the substrate surface portions 20, 30, and the top plate surfaces 262, 272, 362, 372 are present. Can be prevented from projecting out of the substrate surface portions 20 and 30. That is, when the top plate surfaces 262, 272, 362, and 372 are assumed to be columnar bodies whose bottom surfaces are the substrate surface portions 20 and 30, they do not protrude from the columnar bodies. Therefore, it is possible to deal with applications in which the shape of the heat sink is limited, such as a heat sink for a lighting fixture.

  The heat sinks 2 and 3 are formed by folding or truncating the aluminum alloy plate 4 at the boundaries between the above-described regions. Therefore, the convex-shaped bodies 26, 27, 36, and 37 continuously connected from the substrate surface portions 20 and 30 can be easily formed from a single aluminum alloy plate, and the bonded heat sink 1 can be easily formed.

The junction type heat sink 1 of this example is used to dissipate heat generated from the light emitter. The junction heat sink 1 can be used with the substrate surface portion 10 disposed on the light emitter side (see FIGS. 1 to 5).
The junction heat sink 1 can be applied to a light emitting diode. Thereby, the effect which the heat sink of this example which can achieve weight reduction can be utilized remarkably can be achieved, exhibiting the outstanding heat dissipation.

DESCRIPTION OF SYMBOLS 1 Joining type heat sink 10 Board | substrate surface part 15 Heat radiation part 2 Heat sink (1st heat sink)
3 Heat sink (second heat sink)

Claims (6)

Et used to dissipate heat generated from the light emitter is, a bonding heat sink formed by joining the heat sinks to each other,
The heat sink includes a substrate surface portion disposed on the light emitter side, and a heat dissipation portion having an uneven structure formed on the substrate surface portion,
The substrate surface portion and the heat dissipation portion are formed by bending a single aluminum alloy plate ,
The heat dissipating part has an upright surface that stands up in a substantially vertical direction from the substrate surface portion, and a top plate surface that extends in a direction substantially parallel to the substrate surface portion from the upstanding surface and in a direction in which an orthogonal projection onto the substrate surface portion overlaps the substrate surface portion. A descending surface that descends in a substantially vertical direction from the top plate surface to the substrate surface portion, and a bottom plate surface that extends from the descending surface in a direction that is substantially parallel to the substrate surface portion and does not overlap the orthogonal projection of the top plate surface. Has a convex body,
The heat radiating portion has one or two or more convex bodies composed of the standing surface, the top plate surface, the descending surface, and the bottom plate surface. Are connected to each other on one of the bottom plate surface and the other standing surface,
At least a part of the convex body is formed with a through-hole penetrating the aluminum alloy plate constituting the convex body,
A joining type heat sink characterized by joining two above-mentioned heat sinks used as a pair of specular bodies which are in a mirror symmetry relation at the above-mentioned standing surfaces . 2. The bonded heat sink according to claim 1, wherein the bottom plate surface and the substrate surface portion are bonded to each other. According to claim 1 or 2, in the heat sink, orthogonal projection to the substrate surface of the top plate surface, the bonding heat sink, characterized in that within the substrate surface. 4. The aluminum alloy plate according to claim 1, wherein the aluminum alloy plate includes a substrate surface region that forms the substrate surface portion, and a convex body forming region that extends from the substrate surface region. The regions are, in order from the substrate surface region side, a rising surface region that forms the rising surface, a top plate surface region that is connected to the rising surface region and forms the top plate surface, and a descending that is connected to the top plate surface region. And a bottom plate surface region that forms a bottom plate surface that is connected to the down surface region, and the heat sink is configured to fold or valley fold the aluminum alloy plate at the boundary of each region. It is formed by the joining type heat sink characterized by the above-mentioned. In Claim 4, the aluminum alloy plate has one or two or more of the convex body forming regions composed of the standing surface region, the top plate surface region, the descending surface region, and the bottom plate surface region, if you have two or more, the bonding heat sink, characterized in that are continuous with each other in the convex formation region and one of said bottom plate surface area and the other the rising surface area. 6. The bonded heat sink according to claim 1, wherein the bonded heat sink is applied to a light emitting diode.

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