JP3317608B2 - heatsink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink.
That is, the present invention relates to a heat sink used for heat radiation and cooling of cooling objects such as electronic circuits such as ICs, substrates, components, devices, and various types of heating elements.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory front view of a conventional heat sink of this type. FIG. 1A shows one example, and FIG. 2B shows another example. First, in the conventional heat sink 1 shown in FIG. 5A, between the flat plates 2 on the front and back sides,
A continuous high-wave corrugated foil 3 is interposed as a heat radiating portion. In the heat sink 4 of the second conventional example shown in FIG. An assembly laminated and joined using the end interposition materials 6 at both ends while leaving an interval therebetween has been used as a heat radiating part. In the figure, H is a cooling object such as a heating element.
In the heat sink 1 shown in FIG. 5 (1), it is attached and fixed on both front and back sides, and in the heat sink 4 shown in FIG. 5 (2), it is attached and fixed only on one side.

[0003]

The following problems have been pointed out in such a conventional example. That is, in the conventional heat sinks 1 and 4 of this type, as described above, the heat radiating portion is formed of the corrugated foil 3 or the aggregate of the flat plates 5 stacked with an interval therebetween. It has been pointed out that the heat radiating portion has a small surface area per unit volume, a small heat radiating area which comes into contact with the wind during forced air cooling, and has low heat radiating characteristics and poor heat radiating effect / cooling performance.

The present invention has been made in view of the above circumstances, and has been made to solve the above-mentioned problems of the prior art, and is formed by sequentially laminating and joining corrugated plates and flat plates between front and back flat plates. As a result, the heat radiation area becomes large, and the corrugated sheets are laminated in a positional relationship where the top and the valley of the waveform face each other, so that the heat conduction path is the shortest and the heat conductivity is excellent, and It is an object of the present invention to propose a heat sink in which the thickness of a corrugated sheet closer to an object is increased so that a heat conduction path is wider toward an object to be cooled and has excellent thermal conductivity.

[0005]

The technical means of the present invention for achieving this object is as follows. In this heat sink, a plurality of corrugated plates in which corrugations are continuously bent in the same direction between flat plates on the front and back, and a plurality of flat plates are sequentially and alternately laminated. The flat plate and the corrugated plate are joined to each other, and an object to be cooled such as a heating element is arranged and fixed to at least one of the front and back flat plates. And between each said corrugated sheet,
The corrugations having a substantially triangular cross-section are sequentially shifted by a half pitch, and the tops and valleys of the concavities and convexities are stacked via the flat plate so as to be opposed to each other so as to abut each other. Is formed at the shortest distance, and heat is smoothly transmitted internally. At the same time, the corrugated sheet closer to the flat plate on the front and back sides of the object to be cooled is thicker than the other corrugated sheets, so that a heat conduction path from the object to be cooled is reduced. On the side, it is formed widely, and heat is smoothly transmitted internally.

[0006]

The present invention comprises the above-mentioned means, and operates as follows. In this heat sink, heat from the object to be cooled is transmitted between the laminated and bonded corrugated plate and the flat plate via the front and back flat plates. Then, as the wind passes through the hollow spaces formed by these, such heat is deprived, and the heat radiation and cooling of the object to be cooled are performed.

[0007] First, a corrugated plate and a flat plate are alternately laminated and joined between the front and back flat plates to form a heat radiating portion having a large number of hollow spaces. However, the heat radiation area is large, and the heat radiation characteristics are improved. At the same time, each corrugated plate is laminated via a flat plate in a positional relationship in which the peaks and valleys of the corrugations having a substantially triangular cross section are opposed to each other so as to abut each other. Therefore, in such a heat radiating portion, although a large number of hollow spaces exist as described above, since the heat conduction path from the object to be cooled is formed at the shortest distance, heat is smoothly transmitted to the entire heat radiating portion, and the internal Excellent thermal conductivity, and the heat dissipation characteristics are improved from this aspect. Further, in combination with this, the thickness of the corrugated sheet near the object to be cooled is increased. Thus, in such a heat radiating portion, although a large number of hollow spaces exist as described above, the heat conduction path is formed wider near the object to be cooled, and the heat conductivity is further increased, so that heat is more smoothly transmitted, It has excellent internal thermal conductivity and further improves heat dissipation characteristics.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1, 2 and 3 show an embodiment of the present invention. FIG. 1 (1) is a perspective view, FIG. 1 (2) is an enlarged view of a main part thereof, and FIG. The drawings are perspective views, FIG. 2 (2) is a perspective view, FIG. 3 (1) is a perspective view, and FIG. 3 (2) is an enlarged view of a main part thereof. FIG.
It is a perspective view of the reference example which does not belong to this invention.

The heat sink 7 comprises a plurality of corrugated plates 9 having corrugated irregularities continuously bent in the same direction and a plurality of flat plates 10 between flat plates 8 on the front and back sides. It has a panel structure that is sequentially and alternately stacked. The flat plates 8 and 10 and the corrugated plate 9 are joined to each other, and a cooling object H such as a heating element is arranged on at least one of the front and back flat plates 8.

These will be described in more detail. First, as the cooling object H, an electronic circuit such as an IC, a substrate, a component, a device, other heating elements, and other various objects requiring heat radiation and cooling can be considered. Next, the flat plate 8 of the heat sink 7,
Aluminum, copper, iron, and other metal plates and metal foils having excellent thermal conductivity are used as the material of the corrugated sheet 10 and corrugated sheet 9. If high corrosion resistance is required, the material has excellent thermal conductivity. Plastics, glass, carbon, composites thereof, fiber reinforced plastics (FRP) and the like are also used.
The corrugated plate 9 is formed by continuously bending corrugations having a substantially triangular cross section at a predetermined pitch. As shown in FIG. 1 (2), the bonding between the flat plates 8, 10 and the corrugated plate 9 is performed using a metal brazing material, a metal solder, a resin adhesive excellent in heat conductivity, or the like. A bonding material 11 is used.

In the example shown in FIG. 1, the object to be cooled H is mounted and fixed on the flat plate 8 on both the front and back sides, and FIG.
(2) In the example of FIG. 3 and FIG.
, The cooling object H is mounted and fixed. Of course, the present invention is not limited to this, and in each example, the object to be cooled H may be appropriately attached and fixed to both front and back sides or one side. In each of FIGS. 1 and 2 (1) and FIG. 3, the flat plates 8, 10 and the corrugated plate 9 are used in the horizontal direction.
(2), the flat plates 8, 10 and the corrugated plate 9 are used in a vertical orientation. Furthermore, FIG. 1 and FIG.
(2) In each of the examples of FIGS. 3A and 3B, the corrugations between the corrugated sheets 9 are sequentially shifted by half a pitch by a half pitch.
2 and the valley 13 are opposed to each other via the flat plate 10,
Laminated and joined. That is, each corrugated sheet 9 vertically adjacent
Are located so as to face each other such that the tops 12 and the valleys 13 abut each other via the flat plate 10.

As shown in FIG. 3, the corrugated sheet 9 near the flat plate 8 on the front and back sides of the object to be cooled H is thicker than the other corrugated sheets 9. That is, as described above, the cooling object H is attached and fixed only to the lower flat plate 8 in the drawing, and the corrugated plate 9 is set to be thicker as the cooling object H is closer to the cooling object H. That is, as shown in FIG. 3B, the thickness of each corrugated sheet 9 is increased from top to bottom by T1, T2,
Assuming that T3, the relationship is T1 <T2 <T3.
Of course, as described above, instead of setting the thickness of the corrugated sheet 9 so as to gradually change, each corrugated sheet 9 is roughly divided into two parts, one closer to the object H to be cooled and the other one, and The thickness of the thing close to the thing H may be set to be thicker.
For example, as for the illustrated corrugated sheet 9, the lower two sheets may be thicker than the upper two sheets.

In the reference example shown in FIG. 4, the corrugated plate 9 near the flat plate 8 on the front and back sides of the object to be cooled H has a smaller pitch and a lower height than the other corrugated plates 9. Used. That is, in this reference example, the cooling object H is attached and fixed only to the lower flat plate 8 in the drawing as described above, and the corrugated plate 9 has two lower sheets near the cooling object H. However, those having a smaller pitch and lower height of the corrugations than the upper two sheets, that is, those having a high density are used.

In the example shown in FIG. 3, the object to be cooled H is attached and fixed only to the flat plate 8 on one side.
Instead, the present invention is also applicable to a case where the object to be cooled H is attached and fixed to the flat plates 8 on both sides. In this case, the thickness of the corrugated sheet 9 on the center side is set to be thin, and the thickness of the corrugated sheet 9 on both the front and back sides is set to be thick.

The present invention is configured as described above. Then, it becomes as follows. In this heat sink 7, heat from a cooling object H such as a heating element disposed on at least one of the front and back sides is transferred between the laminated and joined corrugated plate 9 and the flat plate 10 via the front and back flat plates 8. Is transmitted. Then, the inside of each hollow space S formed by the corrugated plate 9 and the flat plate 10 and further between the corrugated plate 9 and the flat plate 8 is moved from one opening end face to the other opening end face, such as a forced air cooling fan or the like. As a result, the heat is deprived, and the heat radiating and cooling of the object to be cooled H are performed.

The heat sink 7 is formed by laminating and joining a plurality of corrugated plates 9 and flat plates 10 alternately between front and back flat plates 8. Then, a heat radiating portion is formed by the corrugated plate 9 and the flat plates 10 and 8 thus laminated and joined,
A large number of hollow spaces S are formed, each of which is defined as an independent space. As described above, since the heat radiating portion of the heat sink 7 is formed by the corrugated plate 9, the flat plate 10, and the flat plate 8, the heat radiating portion has a large surface area per unit volume and a large heat radiating area in contact with the wind during forced air cooling. And the heat radiation characteristics are improved.

The heat sink 7 is formed by laminating the corrugated plates 9 via the flat plate 10 in a positional relationship in which the tops 12 and the valleys 13 of the corrugated unevenness are opposed to each other. Therefore, in the heat sink 7, although a large number of hollow spaces S exist as described above, the top portions 1 opposed to each other as described above.
The heat conduction path from the object to be cooled H is formed at the shortest distance in the heat radiating portion by the valley portion 2 and the valley portion 13, and the heat is smoothly transmitted to the entire heat radiating portion. From this aspect, the heat radiation characteristics are also improved.

Further, in addition to the above, the thickness of the corrugated sheet 9 near the flat plate 8 on the front and back sides of the object to be cooled H is increased. Therefore, in the heat sink 7, although a large number of hollow spaces S exist as described above,
Thereby, the heat conduction path from the cooling object H in the heat radiating portion is formed widely near the cooling object H where the heat is high, the heat conductivity is enhanced, the heat is smoothly transmitted, and the internal heat is also transmitted from this surface. Excellent thermal conductivity and improved heat dissipation characteristics.

[0019]

As described above, the heat sink of the present invention exhibits the following effects by laminating and joining the corrugated plate and the flat plate between the front and back flat plates sequentially and alternately. That is, this heat sink has a larger heat radiation area than the above-described conventional heat sink, and accordingly, the heat radiation characteristics are improved, and the heat radiation effect and the cooling performance are excellent.

In addition, the heat sink has the following effects by laminating the corrugated plates in a positional relationship in which the tops and the valleys of the corrugations are opposed to each other.
In other words, this heat sink has a heat conduction path formed at the shortest distance in addition to the above, and is excellent in internal heat conductivity. Are better.

Further, the heat sink has the following effects by increasing the thickness of the corrugated sheet closer to the object to be cooled. In other words, in addition to the above, this heat sink has a wide heat conduction path near the object to be cooled, and therefore has much better internal heat conductivity, and from this aspect, the heat radiation characteristics are improved, and the heat radiation effect and cooling performance Is excellent.
As described above, the effects exhibited by the present invention are remarkably large, for example, the problems existing in this type of conventional example are eliminated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a heat sink according to the invention,
FIG. 1A is a perspective view, and FIG. 2B is an enlarged view of a main part thereof.

FIG. 2 shows an embodiment of the present invention, wherein FIG.
(2) The figure is a perspective view.

FIG. 3 shows an embodiment of the present invention, wherein FIG.
FIG. 2 is an enlarged view of the main part.

FIG. 4 is a perspective view of a reference example not belonging to the present invention.

FIG. 5 is an explanatory front view of a conventional heat sink;
FIG. 1A shows one example, and FIG. 2B shows another example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat sink (conventional example) 2 flat plate (conventional example) 3 corrugated foil 4 heat sink 5 flat plate (conventional example) 6 end interposer 7 heat sink 8 flat plate (front and back) 9 corrugated plate 10 flat plate 11 Joining material 12 top 13 valley H object to be cooled S hollow space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01L 23/34-23/473

Claims (1)

(57) [Claims] 1. A plurality of flat corrugated plates and a plurality of flat corrugated plates in which corrugations are continuously bent in the same direction between flat front and back flat plates. A heat sink in which the flat plate and the corrugated plate are joined together, and a cooling object such as a heating element is disposed and fixed on at least one of the front and back flat plates; Between the plates, the corrugations of a substantially triangular cross-section are sequentially shifted by half a pitch, and the tops and valleys of the concavities and convexities are stacked in a positional relationship facing each other so as to abut each other, Thus, the heat conduction path from the object to be cooled is formed at the shortest distance, heat is smoothly transmitted internally, and further, the corrugated sheet closer to the flat plate on the front and back sides of the object to be cooled. A thicker than the other corrugated sheet is used, Retirement and heat conduction path from the object is formed widely in the cooled object closer, the heat sink, characterized in that, the internally heat is transferred smoothly.