JPH09229026A - Fixing construction for heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detachably fit a heat sink to a base member and stably hold it. SOLUTION: A metal fitting 14 is made of wire 14a having spring property, and provided with a first end part 41 and a second end part 42. The first end part 41 and the second end part 42 are formed so as to be hooked with the underside of the lock projecting parts 21, 22 of a base member 11. This metal fitting 14 is provided with side parts 45, 46 to be formed along the sides of a heat sink 13 and a presser part 50 capable of being engaged with a receiving part 23 provided on the outer circumferential part of the heat sink 13 from the upper side. An arm part 51 is provided between the side parts 45, 46. This arm part 51 is provided a hook 52 formed so as to be hooked with the underside of a lock projecting part 23 getting over it, when it is pushed from the upper side to the third lock projecting part 23 of the base member 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink fixing structure for detachably fixing a heat sink used for cooling a heating element incorporated in a personal computer or other electronic equipment to a base member.

[0002]

2. Description of the Related Art A heat sink is used to lower the temperature of a heating element such as a CPU incorporated in electronic equipment. It is desirable that the heat sink be separable from the base member such as an IC socket and the heating element so that the heating element can be attached and detached. Therefore, some publicly known examples have been proposed as means (fixtures) for detachably fixing the heat sink to the base member.

For example, in a conventional fixture using a metal wire, both ends of the wire are bent to form a locking arm portion, and the wire is attached to the heat sink in such a position that the wire traverses the heat sink. The arm part is hooked on the receiving part of the base member. Then, when the heat sink is removed, the locking arm portion is removed from the receiving portion of the base member. It has also been proposed to fix the heat sink to the base member with a fixing band or a fixing frame made of synthetic resin.

[0004]

In the conventional fixture using the wire as in the above-mentioned prior art, only a part of the heat sink in the circumferential direction is supported by the fixture with respect to the base member. It is difficult to bring the heat sink into contact with the heating element with a uniform load, and the mounting state of the heat sink tends to become unstable. If a plurality of fixtures are used to evenly fix the heat sink, the number of the fixtures increases, which causes problems such as increasing the labor required for assembly. Further, in the conventional fixing with an adhesive, or a fixing structure with a fixing frame made of synthetic resin or a band made of resin, the heat resistance is large and the heat dissipation of the heat sink may be deteriorated. Further, a heat sink fixture using a metal thin plate spring is also provided, but the thin plate spring is expensive in terms of a die for processing and has a low material yield, resulting in high cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a heat sink fixing structure which can be easily and surely attached to and detached from a base member and a heating element, and whose heat dissipation does not deteriorate, and which can be provided at low cost. .

[0006]

In the heat sink fixing structure of the present invention developed to achieve the above object, the mounting metal fitting for fixing the heat sink is made of a wire having a spring property and formed in a predetermined shape. A first end portion having a shape that is located at one end side of the wire and can be hooked on the lower surface side of the first locking protrusion of the base member,
A second end portion having a shape that is located on the other end side of the wire and that can be hooked on the lower surface side of the second locking convex portion of the base member, and a first side portion that has a shape along one side surface of the heat sink. A second side portion having a shape along the other side surface of the heat sink, a holding portion capable of coming into contact with a receiving portion provided on the outer peripheral portion of the heat sink from the upper surface side, the first side portion and the second side portion. The third engaging protrusion of the base member when pressed from above against the third engaging protrusion of the base member, the third engaging protrusion bends outward while contacting the third engaging protrusion. And an arm portion having a hook that crosses over the stop convex portion and is hooked on the lower surface side of the third locking convex portion.

A heat sink is mounted on the IC using the above-mentioned mounting bracket.
To fix to the base member such as a socket, the first side portion and the second side portion of the mounting bracket are fitted along the both sides of the heat sink, respectively, and the first end of the mounting bracket is attached. And the second end are hooked on the first locking projection and the second locking projection of the base member, respectively. Then, by pushing the arm portion into the third locking protrusion of the base member from above, the hook at the tip of the arm is engaged with the third locking protrusion. By doing so, almost the entire circumference of the heat sink is held by the mounting member, and a stable fixed state of the heat sink can be realized.

To remove the heat sink from the base member, the first end of the mounting member is removed from the locking projection, and then the heat sink is twisted with respect to the base member to apply an external force in the width direction. The heat sink can be easily separated from the base member by disengaging the second end portion from the engaging protrusion and further disengaging the hook of the arm portion from the third engaging protrusion. it can.

[0009] As described in claim 2,
When the operation part is provided at the end of the base, the first end can be easily removed from the locking projection by pressing the operation part with a finger when the heat sink is removed from the base member. You can Further, as described in claim 3, when the arm portion and the side portion are formed to have a bent shape, the elastic force of the wire of the mounting bracket itself causes the pressing portion of the mounting bracket to elastically move the heat sink to the base member side. Can be pressed,
It is possible to hold more stable against vibration and the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The electronic component assembly 10 shown in FIG. 1 is built in an electronic device such as a personal computer, and a base member 11 such as an IC socket mounted on a circuit board of the electronic device.
A multi-pin semiconductor package as an example of a heating element 12 such as a microprocessor mounted on the base member 11, and a heat sink 13 for cooling the heating element 12.
And a mounting bracket 14 for fixing the heat sink 13 to the base member 11.

The base member 11 is a base material 11 made of synthetic resin.
A large number of pin holes (not shown) into which the conductive pins of the heating element 12 are inserted are provided inside the base member 1.
By tilting the clamp lever 15 attached to No. 1 in the direction along the base material 11a (the position shown in FIG. 1), the heating pin 12 is inserted in the pin hole of the base member 11 while the conductive pin of the heating member 12 is inserted. It is supposed to be fixed.

A first locking projection 21 is formed on one end of the base member 11, and a second locking projection 22 is formed adjacent to the first locking projection 21. A third member is provided on the other end side of the base member 11.
Locking projections 23 are provided. Each locking projection 21,2
An inclined surface 2 on the upper surface side of 2, 23 such that the tip side is lowered
5 are formed. On the lower surface side of the locking projections 21, 22, 23, a recess 26 having a shape capable of locking the wire 14a of the mounting bracket 14 described later is formed.

The heat sink 13 comprises a body 30 made of a metal having a good thermal conductivity such as an aluminum alloy, and a fan 32 mounted in an opening 31 of the body 30. A large number of heat radiation fins 33 are provided around the entire circumference of the body 30. The back surface (bottom surface side in FIG. 1) of the body 30 is a heat transfer surface in contact with the heating element 12. The fan 32 is rotated by a motor (not shown). Reference numeral 34 in the figure is a power supply lead wire of the motor. When the fan 32 is rotated in a predetermined direction by the motor, the air sucked from the opening 31 is discharged in the radial direction of the fan 32, and the air passes through the heat radiation fins 33, whereby the body 3
0 is cooled and the heating element 12 is cooled. Near the four corners of the outer peripheral portion of the heat sink 13, hook-shaped receiving portions 35 with their tips facing upward are provided.

The mounting member 14 for fixing the heat sink 13 to the base member 11 is composed of one metal wire (formed wire) 14a having a spring property and formed in the following shape. This mounting bracket 14 is a wire 14a
A first end 41 located at one end of the wire 14a and a second end 42 located at the other end of the wire 14a. The first end portion 41 has a shape extending in the direction (almost horizontal direction) along the base member 11 so that the first end portion 41 can be hooked from the lower surface side. The second end portion 42 has a shape extending in a direction along the base member 11 (a direction opposite to the first end portion 41) so that the second end 42 can be hooked to the second locking projection 22. I am trying. By providing the both end portions 41, 42 having such a shape, the heat sink 13 does not drop out or shift in position due to horizontal vibration, vertical vibration, or shock, and stable mounting can be realized.

The mounting bracket 14 is bent and formed into a generally symmetrical shape, and has a first side portion 45 having a shape along one side surface of the heat sink 13 and a second side portion having a shape along the other side surface of the heat sink 13. A pressing portion 50 having a shape that can be engaged with the portion 46 and the four receiving portions 35 provided on the heat sink 13 from the upper surface side of the heat sink 13 is provided. The pressing portion 50 extends in a substantially horizontal direction along the body 30 of the heat sink 13.

Further, as shown in FIG. 4, an arm portion 51 connected between the first side portion 45 and the second side portion 46.
Is provided. This arm portion 51 has a mounting bracket 14
Is attached to the heat sink 13 and protrudes in a direction away from the heat sink 13.
A downwardly facing hook 52 is formed at the tip of the. As shown in FIG. 7, when the arm portion 51 is pushed into the third locking protrusion 23 from above, the hook 52 contacts the inclined surface 25 of the locking protrusion 23 while the hook 52 is in contact with the outside. The hook 52 has a shape in which the hook 52 rides over the locking projection 23 and is then hooked in the recess 26 on the lower surface side of the locking projection 23.

In the case of the mounting bracket 14 of this embodiment, the first
An operation portion 55 is provided at the end portion 41 of the. The operation portion 55 has a shape that allows fingers to be hooked when the end portion 41 is removed from the locking projection 21. On the other hand, the second end 4
2 shows the position of the heat sink 13 in the width direction (arrow B in FIG. 9 after removing the first end 41 from the locking projection 21).
The shape is such that it can be disengaged from the second locking projection 22 when it is displaced in the direction).

As shown in FIG. 5, the arm portion 51 is inclined slightly upward by an angle .theta.1 with respect to the line segment H in the horizontal direction (extending direction of the side portion 45) so that the tip end side thereof is slightly raised. The bent shape is such that the hook 52 overhangs inwardly at an angle .theta.2 with respect to the vertical line. Further, as shown in FIG. 6, the side portions 45 and 46 on both the left and right sides are bent downward with respect to the horizontal line segment by angles θ3 and θ4. With such an angled shape, when the hook 52 is hooked on the third locking projection 23 (the state shown in FIG. 8), the mounting metal fitting 14 is moved by the elastic force generated by the bending of the wire 14a. The heat sink 13 to the base member 11
I try to push it to the side.

In order to fix the heat sink 13 to the base member 11 by using the mounting bracket 14, the first side portion 45 and the second side portion 46 of the mounting bracket 14 are arranged along both sides of the heat sink 13, respectively. The fitting is performed and the first end portion 41 and the second end portion 42 of the mounting member 14 are hooked on the first locking convex portion 21 and the second locking convex portion 22, respectively. In this state, as shown in FIG. 7, the lower end of the hook 52 of the arm portion 51 faces the inclined surface 25 of the third locking projection 23. In this state, the arm 52 is pushed in from above the locking projection 23 with the finger f to engage the hook 52 with the locking projection 23 as shown in FIG.

As a result, the first end portion 41, the second end portion 42, and the arm portion 51 are fixed to the base member 11, and the side portions 45, 4 having a shape that is substantially symmetrical to the left and right.
Both sides of the heat sink 13 are sandwiched by the six. For this reason, almost the entire circumference of the heat sink 13 is held in a well-balanced manner by the mounting member 14, and a load is exerted that can stably fix the heat sink 13 against lateral vibration or vertical vibration. Since the mounting bracket 14 is mainly composed of the metal wire 14a, it does not interfere with the cooling function of the heat sink 13.

As in this embodiment, if the arm portion 51 is inclined at the angles θ1 and θ2 and the side portions 45 and 46 are inclined at the angles θ3 and θ4, the hook 5 is formed.
2 is hooked on the locking projection 23, the wire 1
By the elastic force of 4a, the pressing portion 50 of the mounting member 14 can elastically press the heat sink 13 toward the base member 11 side, and more stable holding is possible.

When the heat sink 13 is to be removed from the base member 11, the operating portion 55 of the mounting member 14 is spread outward with fingers and pushed down a little, and then the fingers are released. The end portion 41 of the can be removed from the locking convex portion 21. After that, by applying a force to move the heat sink 13 in the direction of arrow B to the base member 11, the second end portion 42 is disengaged from the second locking convex portion 22. At this time, since the heat sink 13 can move in the direction of arrow C with respect to the base member 11, the hook 52
Is easily disengaged from the third locking projection 23. Therefore, the heat sink 13 can be separated from the base member 11 without using a tool.

As with the mounting bracket 60 of the embodiment shown in FIG. 10 (a), the second end portion 42 of the wire 14a may be provided with an operating portion 61 having a shape such that a finger can be hooked. With this configuration, when the heat sink 13 is detached from the base member 11, the operating portions 55 and 61 are used to detach the first end portion 41 and the second end portion 42 from the locking projections 21 and 22. be able to.

Mounting bracket 7 of the embodiment shown in FIG. 10 (b)
0 is applied when the outer shape of the heat sink is substantially circular, and the first side portion 45 and the second side portion 4 are
6 are formed in an arc shape (a shape that is almost symmetrical) along the side of the heat sink. These Figure 10
In the embodiment shown in (a) and (b), the portions common to the mounting bracket 14 shown in the above-described embodiment (FIG. 1 and the like) are designated by the same reference numerals as those in the above-mentioned embodiment and the description thereof will be omitted.

[0025]

According to the present invention, the heat sink can be easily attached to and detached from the base member, the heat sink can be securely and stably held on the base member, and the thermal resistance is small. The mounting bracket of the present invention can be easily formed by a wire forming machine and the material yield is 100%.
It can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of an electronic component assembly including a heat sink fixing structure according to an embodiment of the present invention.

FIG. 2 is a plan view of the electronic component assembly shown in FIG.

FIG. 3 is an exploded perspective view of the electronic component assembly shown in FIG.

4 is a plan view of the heat sink mounting bracket shown in FIG. 1. FIG.

5 is a side view of the heat sink mounting bracket shown in FIG. 1. FIG.

6 is a front view of the heat sink mounting bracket shown in FIG. 1. FIG.

FIG. 7 is a side view showing a state in which the heat sink mounting bracket is being attached to the electronic component assembly shown in FIG. 1.

8 is a side view of the electronic component assembly shown in FIG.

9 is a perspective view showing a state in which the heat sink mounting bracket of the electronic component assembly shown in FIG. 1 is being removed.

FIG. 10 is a perspective view showing a modified example of the heat sink mounting bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electronic component assembly 11 ... Base member 12 ... Heating element 13 ... Heat sink 14 ... Mounting metal fitting 14a ... Wires 21, 22, 23 ... Locking convex part 35 ... Receiving part 41 ... First end 42 ... Second end Part 45 ... First side part 46 ... Second side part 50 ... Holding part 51 ... Arm part 52 ... Hook 55 ... Operating part 60, 70 ... Mounting bracket

Claims (3)

[Claims] 1. A heat sink fixing structure in which a heat sink is fixed to a base member on which a heating element is mounted by means of a mounting metal fitting, wherein a first locking projection and a first locking projection are provided on one end side of the base member. A second locking projection is provided adjacent to the second locking projection, and a third locking projection is provided on the other end side of the base member. The fitting is made of a wire having a spring property and formed into a predetermined shape. The mounting bracket is located at one end side of the wire and has a first shape that can be hooked on the lower surface side of the first locking projection of the base member.
Of the second end of the wire and a second shape of a shape that is located on the other end side of the wire and can be hooked on the lower surface side of the second locking projection of the base member.
End portion, a first side portion having a shape along one side surface of the heat sink, a second side portion having a shape along the other side surface of the heat sink, and a receiving portion provided on an outer peripheral portion of the heat sink. The pressing portion, which can come into contact with the heat sink from the upper surface side, is located between the first side portion and the second side portion and is pushed into the third locking projection of the base member from above. An arm portion having a hook shaped so as to bend outward while being in contact with the third locking projection when riding over the third locking projection, and to be hooked on the lower surface side of the third locking projection. And a heat sink fixing structure comprising: 2. An operating portion having a shape such that a finger can be hung when the first end portion is disengaged from the first locking projection portion at the first end portion of the fitting. Also, the second end of the mounting member has a second end when the position of the heat sink is displaced in the width direction with respect to the base member in a state where the first end is removed from the first locking projection. 2. The heat sink fixing structure according to claim 1, wherein an end portion of the heat sink is formed to be disengaged from the second locking convex portion. 3. The arm portion and the side portion of the mounting member hook the first end portion and the second end portion on the locking projection and respectively hook the hook on the third locking projection. The heat sink fixing structure according to claim 1, wherein the heat sink has a bent shape that is inclined so that the heat sink is pushed toward the base member side by the elastic force of the wire of the mounting member itself when hooked on the heat sink.