JP3325705B2 - Radiator for electronic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device in which a heat radiating member formed of a metal material having a high thermal conductivity is provided in contact with or adjacent to a heating element such as an electronic element having a large heat generation such as an IC. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiating device for an electronic device, and more particularly to a heat radiating device for an electronic device which can facilitate a process of forming various holes in a heat radiating member and can enhance a heat radiating effect.

[0002]

2. Description of the Related Art FIG. 5 is a partially exploded perspective view showing a structure of a conventional heat radiating device used for an on-vehicle acoustic device as an example of an electronic device. Reference numeral 1 denotes a heat radiating member. The heat radiating member 1 is made of a metal material having a high thermal conductivity (for example, an aluminum alloy), and is disposed on a side surface or a rear surface of a housing B of an in-vehicle acoustic device in which a cassette tape, a compact disk, or the like is loaded. The heat radiating member 1 is provided to radiate heat of an electronic component (power IC) 7 constituting the audio amplifier. The electronic component 7 is provided in contact with the inner surface 1a of the heat radiating member 1, and its lead terminal 7a
Are inserted into through holes of a printed wiring board 6 provided at the bottom of the housing B, and the lead terminals 7a are connected to conductive patterns of the wiring board 6 by soldering. In order to enhance the heat radiation effect of the electronic component 7, the electronic component 7 is pressed by the support plate 8 and is brought into close contact with the inner surface 1 a of the heat radiation member 1. A mounting screw 9 is inserted into a mounting hole 8 a of the support plate 8, and the mounting screw 9 is screwed into a screw hole 2 formed in the heat radiation member 1.

[0003] The housing B is formed by bending a portion other than the heat radiation member 1 with a thin metal plate. Since the heat dissipating member 1 has a larger thickness than the metal plate forming the housing B,
The outer surface 1b of the heat dissipating member 1 is often used as a screw fastening portion such as a bracket for attachment to a vehicle body. Therefore, the heat dissipation member 1 is provided with a screw hole 3 for attaching the bracket. Since the shape of this type of bracket and the screw tightening location differ depending on the type of vehicle and the like, the heat radiating member 1 is provided with a plurality of screw holes 3 at a plurality of locations so as to correspond to various brackets. In addition, various components are attached to the outside of the housing B, for example, in relation to the bracket. Since the mounting screws of these components extend to near the wall surface of the housing B, escape holes 4 and 5 for escaping the mounting screws are formed in a plurality of locations of the heat radiation member 1. Since the positions of the mounting screws also vary depending on the type of vehicle, etc., the heat radiating member 1 is provided with a plurality of escape holes 4 and 5 at a plurality of locations so as to be compatible with various types of vehicles.

[0004]

The heat dissipating member 1 has a complicated cross-sectional shape in which ribs (fins) 1c and 1d for heat dissipating are formed on an outer surface 1b. Therefore, the heat radiating member 1 is formed from a material obtained by extruding an aluminum alloy using a mold conforming to this shape. In the heat-dissipating member 1 formed by the extrusion molding, the thickness T is as thick as about 9 mm. When a hole is to be formed in an aluminum alloy or the like by pressing, the thickness is limited to about 6 mm. Further, when a small-diameter hole is formed by a press, it is necessary that the wall thickness be smaller. Therefore, in the conventional heat dissipating member 1 shown in FIG. 5, the pilot holes and the relief holes 4, 5 of the screw holes 2 and 3 cannot be formed in the pressing step, but are formed by cutting. The threaded hole will be tapped. In this cutting process, a large number of holes are processed simultaneously or separately, and the drilling length of the holes is 9 m.
Since the length is as long as about m, the processing time is long and the manufacturing cost is very high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a heat radiating device for electronic equipment which facilitates processing of each hole in a heat radiating member and further enhances a heat radiating effect. I have.

[0006]

Means for Solving the Problems The present invention provides a heat dissipation device of an electronic device heat dissipation member is provided to or adjacent contacts to the heating element, the heat radiating member is orthogonal to the thickness direction
A space that has a long hole shape that spreads in the width direction and is surrounded by the periphery
The upper and lower sides are opened at the upper and lower ends of this heat radiating member.
A hole or a screw hole is formed in at least one of the walls sandwiching the space, and the heating element is provided on an outer surface of the wall sandwiching the space.
It is characterized by having been done.

For example, it is formed by extruding a metal material.
And the pilot hole of the hole or the screw hole is
The other wall is formed by punching.

The heating element is an electronic component (heat-generating electronic component) that generates a large amount of heat, such as a power IC constituting an audio amplifier or a large transistor. The heat radiating member is formed of a metal material having a high thermal conductivity such as an aluminum alloy. The heating element is preferably provided in contact with or in close contact with the heat radiating member in order to enhance the heat radiating effect. However, the heat radiating member and the heat generating element sandwich a small gap or a material having high thermal conductivity such as silicon oil. They may be provided adjacent to each other in a state where they are open.

The space portion is formed in a long hole shape or a cut-out shape entering from an end when the heat radiation member is viewed in a cross section in the plate thickness direction. It has a shape in which a portion and a wall sandwiching this space exist.

The screw hole is for fixing a supporting member for pressing the heating element so as to be in close contact with the heat radiating member, or for screwing other components. The holes are used, for example, as escape holes for escaping mounting screws provided in other parts.

[0011]

The heat dissipating member is extruded from, for example, an aluminum alloy. When the heat dissipating member is viewed in cross section, since the space portion and the wall portion sandwiching the space portion are present, the thickness of the wall portion at the position sandwiching the space portion is the thickness dimension of the entire heat dissipating member. Thinner than Therefore, for example, a pilot hole for a screw hole, a hole for a relief hole, or the like can be formed in a wall in a pressing step. Alternatively, even if a hole is formed by cutting, the wall thickness is small, so that the cutting time can be sufficiently reduced as compared with the conventional case. The hole may be formed by penetrating both wall portions sandwiching the space portion in common, or the hole may be formed only on one wall portion. After drilling this hole, a necessary portion is tapped to form a screw hole.

As described above, the hole can be formed by pressing, and the hole can be formed in a shorter time by cutting than in the past, so that the processing cost of the heat radiation member is sufficiently reduced. In the case of a structure in which the space is open to the end face of the heat radiating member, the area where the heat radiating member comes into contact with the outside air is widened, and the heat radiation efficiency is improved due to the chimney effect of the space.

When a heating element such as a heat-generating electronic component is provided in contact with or adjacent to the outer surface of one of the walls sandwiching the space, a screw hole provided in the other wall is provided with the one wall. If the screw is tightened into the screw hole, the screw does not hit the heat-generating electronic component or the like when formed, so that damage to the electronic component due to screw tightening can be prevented.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a heat dissipating device provided in a housing portion of an in-vehicle acoustic device as one embodiment of the present invention.
3 is a perspective view of the heat radiating member viewed from the inside of the housing, FIG. 3 is a cross-sectional view of the heat radiating member, and FIGS. 4A and 4B are cross-sectional views illustrating an example of a process of forming a hole in the heat radiating member. FIG. 1 shows a part of a housing 10 of an in-vehicle audio device in which a cassette tape, a compact disk, or the like is loaded. The housing 10 is formed by bending a metal plate. A cutout 12 is formed in one side plate 11, and a heat dissipation member 20 is attached to the cutout 12. Outer surface 20 of heat dissipation member 20
a is installed so as to be substantially flush with one side plate 11 of the housing 10. The heat dissipating member 20 includes the mounting screws 13a and 13
It is attached to the side plate 11 and the ceiling plate 15 of the housing 10 by b and the mounting screws 14.

As shown in FIG. 2, the inner surface 2
In 0b, electronic components (heat-generating electronic components) 17, 17 having a large amount of heat dissipation are provided in close contact with, in contact with, or adjacent to the heat generating element. The electronic components 17, 17 are power ICs constituting an audio amplifier. Electronic components 17
In order to dissipate the heat efficiently, it is preferable that the electronic components 17 and 17 are in close contact with the inner surface 20 b of the heat radiating member 20.
May be adjacent to each other via a minute gap. Electronic component 1
When the inner and outer surfaces 7 and 17 are adjacent to the inner surface 20b via a minute gap, it is preferable to apply a material having good thermal conductivity such as silicone oil to the gap between the two. The above electronic component 1
The lead terminals 17a, 17a,.
The lead terminals 17a, 17a are inserted into through holes of a printed wiring board provided on the inner surface of the bottom plate 16 and are soldered to conductive patterns of the printed wiring board.

The heat radiating member 20 has a plurality of ribs (fins) 20c, 20c,... Formed on the outer surface thereof, and thin portions 20d and 20e formed on both sides. Inside the heat radiating member 20, elongated holes 20g, 20g extending in a direction orthogonal to the plate thickness direction are formed so as to penetrate therethrough.
The internal space of 20 g is the space A inside the heat radiation member 20.
It has become. In the portions where the elongated holes 20g and 20g are formed, the thin wall portions B1 and B2 sandwiching the space A are formed.
Is formed. The heat radiating member 20 is formed of a metal material having a high thermal conductivity such as an aluminum alloy. The outer surface 20a and the inner surface 20b, ribs (fins)
The material formed by extruding the metal material by using a molding die having a shape corresponding to 20c and the elongated holes 20g, 20g becomes a material (mold material), and the heat dissipation member 20 is formed by processing this material.

The mounting piece 20f into which the mounting screw 13a is inserted is formed by cutting from the extruded material. A plurality of holes are formed in the extruded product. First, a hole 21 through which the mounting screw 13a is inserted is formed in the mounting piece 20f, and a hole 22 through which the mounting screw 13b is inserted is formed in the thin portion 20d at the left end in the figure. As shown in FIG. 2, a support member (support plate) 31 is provided on the inner surface side of the heat radiation member 20. Fixing pieces 31a and 31b are formed on both sides of the support member 31,
The fixing piece 31a has a screw hole 31c, and the fixing piece 31b has a similar screw hole. The support member 31 is installed on the back side of the electronic components 17. The mounting screw 13
a is a hole 21 of the heat radiation member 20 and a mounting hole 11a of the side plate 11.
And screwed into the screw hole 31c of the support member 31. The mounting screw 13b is inserted into the hole 22 of the heat radiation member 20 and the mounting hole formed in the side plate 11, and is screwed into a screw hole formed in the fixing piece 31b of the support member 31.

The heat radiating member 20 and the supporting member 31 are both fastened to the side plate 11 by the mounting screws 13a and 13b, and the electronic components 17, 17 are fixed by the supporting member 31.
Is pressed against the inner surface 20 b of the heat radiating member 20. A hole 23 is formed in the upper part of the heat radiating member 20 so as to penetrate the walls B1 and B2 sandwiching the space A.
3 and screwed into a screw hole 15 a formed in the ceiling plate 15 of the housing 10. Thin portion 20e of heat radiation member 20
Is provided with a screw hole 24 and a relief hole 25. A plurality of screw holes 26 and relief holes 27 are formed in the portion where the long holes 20g of the heat radiation member 20 are formed from the outer surface 20a side.

Each of the screw holes 24 and 26 is for screwing a bracket when the housing 10 is mounted in a console panel of an automobile or the like. In this type of bracket, the screwing points differ depending on the vehicle type.
4 and 26 are formed at a plurality of locations. Also, the housing 10
Various parts are screwed to a part of the vehicle body or the like outside of the vehicle for mounting the housing 10 or for other purposes. The mounting screw for this screw is housing 1
The relief holes 25 and 27 are used to escape this mounting screw because they extend to near zero. Since the positions of the mounting screws also differ depending on the type of vehicle and the like, a plurality of relief holes 25 and 27 are formed to cope with this.

As shown in FIG. 3, since the screw hole 26 and the relief hole 27 are arranged in the region where the elongated hole 20g is formed, the processing of each hole is performed by the thin wall portion B1 or the wall portion B1. And B2. For example, when the overall thickness T of the heat radiating member 20 is 9 mm, by providing the space A, the thickness t of each of the wall portions B1 and B2 can be reduced to about 3 mm. Therefore, it becomes possible to machine the pilot hole of the screw hole 26 or the relief hole 27 by pressing. 3A, a screw hole 26 is formed through both wall portions B1 and B2.
Is also formed through the wall portions B1 and B2. In the part shown in (b) in FIG.
Is formed only in the wall portion B1, and the screw hole does not reach the other wall portion B2. Also, in the case of the escape hole 27, it can be formed only in the wall portion B1 so as not to reach the other wall portion B2.

FIG. 4 shows a pilot hole and a relief hole 27 of the screw hole 26.
Is processed by a press. As shown in FIG. 4A, when the prepared hole or the relief hole 27 of the screw hole 26 is formed only on one wall B1, the extruded material is placed on the work table T1 and the die D1 is formed. Is installed in the space A, and a hole is punched only in the wall B1 with the punch P1. As shown in FIG. 4 (B), when the pilot hole or the relief hole 27 (and the mounting hole 23) of the screw hole 26 is formed to penetrate, the extruded material is formed into a die D2.
It is installed on the upper side and punches the walls B1 and B2 at the same time with the punch P2. Since the wall portions B1 and B2 have a thickness t of about 3 mm, they can be easily punched and formed with a punch. The screw hole 26 is tapped after punching a pilot hole.

The thin portions 20d and 20e also have thinner plate thicknesses, so that the lower holes and the relief holes 2 of the screw holes 24 are formed.
5 and the mounting hole 22 can also be stamped and formed by pressing. Similarly, the hole 21 formed in the mounting piece 20f can be punched out by press working. Alternatively, even when each hole is formed by cutting, since the space A is formed, the advance distance of the drill becomes short, and the processing time can be shortened.

As described above, the pilot holes and relief holes of each screw hole are
It is also possible to pierce only one of the wall portions B1.
And B2. However, as shown in FIG. 3B, when the electronic component 17 as a heating element is provided in close contact with or adjacent to the outer surface of one wall B2, the other wall B1 is provided. It is preferable that the screw hole 26 formed at a length smaller than the length of the wall portion B2. That is, a bracket to be attached to the vehicle body is screwed and fixed to the screw hole 26. At this time, an unnecessarily long mounting screw is used.
Even if it is screwed to 6, the tip end stays at the wall portion B2 and does not reach the electronic component 17. Therefore, even if a long mounting screw is used carelessly, the tip of the mounting screw does not hit the electronic component 17 and damage to the electronic component can be prevented. This is also one of the effects of forming the space portion A inside the heat radiation member 20. Further, the heat dissipating member 20 has a space A formed therein, and as shown in FIG.
Are open at the upper and lower end surfaces of FIG. Therefore, the area where the heat dissipating member 20 comes into contact with air (heat dissipating area) is widened, and the heat dissipating effect of the heat dissipating member 20 can be enhanced by the chimney effect of the space A (the elongated hole 20g).

In the embodiment shown in FIG. 1, since the elongated hole 20g forming the space A is divided into two places, each wall B1 is formed.
And B2 have high rigidity, but both long holes 20g, 20
The space portion A may be formed by making g continuous and long. A notch that opens at the position of one end (c) shown in FIG. 1 instead of the elongated hole 20g extends into the heat radiation member 20, and the notch whose one end is open forms the space A. You may. The electronic component serving as the heating element is not limited to the power IC, but may be a large transistor or the like. Further, the place where the heat radiating member is provided is not limited to the housing 10 of the vehicle-mounted acoustic device, but may be provided in another electronic device, for example, a power supply circuit unit of a machine tool or the like.

[0025]

According to the present invention , since the space is formed in the heat radiating member, the thickness of the wall sandwiching the space can be reduced, and the processing of the hole in the wall becomes easy. Further, since the space is formed in the heat radiating member, the heat radiating effect is enhanced.

Further , in the present invention , since a space is formed in the heat radiating member and it is possible to form a screw hole only in one of the walls, when the heating element is arranged on the outer surface of the other wall, The screw screwed into the screw hole does not reach the heating element, and the screw does not damage the heating element.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing a heat dissipation device provided in a housing of an on-vehicle audio device as one embodiment of the present invention;

FIG. 2 is a perspective view of the heat radiation member viewed from the inside of the housing;

FIG. 3 is a cross-sectional view of a heat dissipation member.

FIGS. 4A and 4B are cross-sectional views illustrating an example of a step of forming a hole in a heat dissipation member.

FIG. 5 is a perspective view showing a heat dissipation device of a conventional on-vehicle acoustic device;

[Explanation of symbols]

 10 Housing 13a, 13b, 14 Mounting Screw 17 Heating Element (Electronic Component) 20 Heat Dissipating Member 20g Long Hole 26 Screw Hole 27 Escape Hole A Space B1, B2 Wall

Claims (3)

(57) [Claims] 1. A heat radiating device for an electronic device provided with a heat radiating member in contact with or adjacent to a heating element, wherein the heat radiating member has an elongated hole shape extending in a width direction orthogonal to a plate thickness direction.
A space surrounded by the upper and lower ends of the heat dissipating member
Formed through the entire length in the vertical direction to open at the end
A hole or a screw hole is formed in at least one of the wall portions sandwiching the space portion, and a hole or a screw hole is formed outside the wall portion sandwiching the space portion.
A heat radiating device for an electronic device , wherein the heat generating element is provided on a surface. 2. A method formed by extruding a metal material.
The heat radiating device for an electronic device according to claim 1 . 3. The pilot hole of the hole or the screw hole,
The other wall is formed by punching.
3. A heat dissipation device for an electronic device according to claim 2.