JP2006229003A - Heat sink retaining clip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink retaining clip excellent in operativity which can flexibly correspond to the variation of a heat sink size, LSI load resistance, a substrate thickness or the like, stably retain the heat sink without causing come-off from a substrate and reduce a manufacturing cost by a relatively simple structure. <P>SOLUTION: The clip has elastic locking parts 4a, 4b with spring properties at both ends. Locking is carried out by inserting the elastic locking parts into holes formed in a substrate by using a spring property. An extendable part 6 is formed between the elastic locking parts at both ends, and the length can be adjusted by the extendable part. Each elastic locking part is constituted of a pair of clicks 7c, 7d with spring properties. Since the length can be adjusted by the extendable part, it is possible to flexibly correspond to various heat sink sizes and to meet the variation of an LSI withstand load and a substrate thickness or the like, as the elastic locking parts at both ends can be locked to the receiving part of the substrate using its spring property, thus stably retaining the heat sink without causing come-off from the substrate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat sink holding clip that holds a heat sink and fixes it on a substrate.

  Conventionally, in the case of using a clip as one of the means to fix the heat sink on the board, a dedicated clip corresponding to the heat sink size, LSI load resistance, board thickness, etc. was designed and supported each time. It was uneconomical.

  Further, in the case where the clip is locked on the substrate using the anchor pin, as shown in FIG. 4, the tip end portion of the U-shaped anchor pin 51 is passed through the through hole 53 with the land 53 a of the substrate 52, so The anchor pins 51 are fixed to the substrate 52 by soldering 54 therein. Then, as shown in FIG. 5, the hook portions 55 a at both ends of the clip 55 are hooked on the U-shaped anchor pins 51 on both sides, and the heat sink 56 is pressed by the clip 55 to be held on the substrate 52.

  However, in this case, the anchor pin 51 cannot withstand the force of the clip 56 and may come out of the through hole 53.

  Furthermore, in the thing of patent document 1 (international patent publication WO96 / 29850 gazette), in addition to the arch-shaped clip main body which has a leg part with a nail | claw at both ends, the fall prevention pin which consists of a stainless steel wire is used, and a clip main body is used. The claw portions at both ends are hung on the hole of the substrate, and the state is held by utilizing the elasticity of the drop-off prevention pin.

  However, according to this, in addition to the clip body manufactured with a press die, a drop-off prevention pin made of stainless steel wire is required. In addition, a hole and a steady-state guide for holding the drop-off prevention pin on the clip body and combining them Has to be provided on the clip body, which increases the manufacturing cost. In addition, since the length of the clip body is constant and the holding load of the clip is also constant, it is impossible to respond to changes in the heat sink size, LSI load resistance, substrate thickness, and the like.

Recently, as the calorific value of LSI increases from 10W class to several tens of W class, the heat sink size tends to increase in size and weight, and the thickness of the substrate is not uniform. There is a demand for a clip that can flexibly respond to such changes.
International Patent Publication WO 96/29850

  The problem of the present invention is that it can flexibly cope with changes in the heat sink size, LSI load resistance, substrate thickness, etc., can stably hold the heat sink without detaching from the substrate, and is manufactured with a relatively simple structure. It is an object of the present invention to provide a heatsink retaining clip that can reduce cost and has good workability.

  The present invention is a clip for holding a heat sink that holds a heat sink and fixes it on a substrate, and has elastic locking portions having spring properties at both ends, and these elastic locking portions are attached to a receiving portion provided on the substrate. It is designed to be inserted and locked using a spring property, and has an expansion / contraction portion between elastic locking portions at both ends, and the length can be adjusted by the expansion / contraction portion. .

The preferable form is as follows.
The part between the elastic part and the elastic locking part on both sides also has a spring property.
The receiving portion provided on the substrate is a hole, and each elastic locking portion is constituted by a pair of claw portions having a spring property, and the pair of claw portions are inserted into the holes of the substrate to be locked.
The stretchable part is composed of a sheath part and a latch part, and the latch part is inserted into the sheath part so as to be slid stepwise in both the inside and outside directions.
The clip is composed of a pair of parts that can be separated by a sheath-like part and a latch part in the stretchable part.

  According to the clip of the present invention, the length can be adjusted by the expansion / contraction part, so that it can flexibly cope with various heat sink sizes, and the elastic locking parts at both ends are locked to the receiving part of the substrate by utilizing its spring property. Therefore, it is possible to respond to changes in LSI load resistance, substrate thickness, and the like and to stably hold the heat sink without being detached from the substrate.

  As in the invention according to claim 2, if the portion between the expansion and contraction portion and the elastic locking portions on both sides is also provided with a spring property, the heat sink can be held more stably and the change in the shape can be dealt with.

  As in the invention according to claim 3, when each elastic locking portion is formed as a pair of claw portions having a spring property and inserted into the hole of the substrate to be locked, the holding to the substrate is ensured. In addition, workability is also good.

  As in the invention according to claim 4, when the latch part is structured to expand and contract by step sliding in both the inside and outside directions with respect to the sheath-like part, the length adjustment is easy.

  As in the invention according to claim 5, when the two-part structure is separated by the sheath-like part and the latch part, it is easy to manufacture and can be inexpensively provided as a clip that expands and contracts.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the clip 1 of this embodiment is composed of two (a pair) parts 1a and 1b formed of plastic or the like, and can be expanded and contracted as a whole by combining them in a symmetrical direction ( The length can be adjusted).

  That is, the two parts 1a and 1b are respectively composed of a flat sheath-like portion 2a and 2b, an arm portion 3a and 3b having a spring property that is integrally and continuously bent from now on, and an arm portion 3a and 3b. Elastic locking portions 4a and 4b fixed to the bent tip portion. Then, by inserting a serrated latch portion 5 on both sides into the sheath portions 2a and 2b of the two parts 1a and 1b, the latch portion 5 and the sheath portions 2a and 2b are expanded and contracted at the center. 6, the length of the latch portion 5 can be adjusted stepwise by sliding the step portion in both the inner and outer directions with respect to the sheath-like portions 2a and 2b.

  Each of the elastic locking portions 4a and 4b is formed by projecting a pair of claw portions 7c and 7d outwardly from each other in the width direction so as to protrude substantially in parallel. The pair of claw portions 7c and 7d are spaced apart from each other. It has springiness in both the shrinking direction and the thickness direction.

  As shown in FIGS. 2 and 3, the clip 1 having such a structure has a length corresponding to the size of the heat sink 8, so that it is between the latch portion 5 and the sheath portions 2 a and 2 b on both sides thereof. The length of the elastic locking portions 4a and 4b at both ends is adjusted by lengthening and contracting stepwise by the expansion and contraction portion 6 by the step sliding. Is inserted into the hole 10 and locked to the substrate 9, and the heat sink 8 is pressed by the clip 1 to be fixed on the substrate 9.

  In such a use state, the clip 1 is flexibly molded with the arm portions 3a and 3b on both sides and has a spring property in the vertical direction, so that it can flexibly cope with changes in LSI load resistance. In addition, the claw portions 7c and 7d inserted into the hole 10 of the substrate 9 with a small interval are outwardly locked with each other and below the hole 10 by the restoring force due to the spring characteristics in both directions as described above. Therefore, the hole 10 does not come out and can flexibly cope with changes in the length (substrate thickness) of the hole 10 and the size of the hole 10, and the heat sink 8 can be stably held on the substrate 9.

  The clamp according to the present invention is mainly used for holding a heat sink, but can be applied when holding something other than the heat sink on the substrate.

It is a perspective view of an example of the clip for heat sink holding by this invention. It is a side view which shows the use condition. It is a perspective view similarly. The prior art example which latches a clip on a board | substrate using an anchor pin is shown, (A) is a side view of the state which fixed the anchor pin to the board | substrate, (B) is the sectional drawing. It is a perspective view of the heat sink holding state by the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clip 1a * 1b Parts 2a * 2b Sheath-like part 3a * 3b Arm part 4a * 4b Elastic locking part 5 Latch part 6 Expansion / contraction part 7c * 7d Claw part 8 Heat sink 9 Substrate 10 Hole

Claims (5)

  A heat sink holding clip that holds the heat sink and fixes it on the substrate, and has elastic locking portions having spring properties at both ends, and these elastic locking portions are provided with spring properties on the receiving portion provided on the substrate. For heat sink retention, characterized in that it is inserted and locked using, and has a stretchable portion between the elastic locking portions at both ends, and the length can be adjusted by the stretchable portion. clip.   2. The heatsink holding clip according to claim 1, wherein a portion between the expandable portion and the elastic locking portions on both sides also has a spring property.   The receiving portion provided on the substrate is a hole, and each elastic locking portion is constituted by a pair of claw portions having spring properties, and the pair of claw portions are inserted into the holes of the substrate to be locked. The heatsink retaining clip according to claim 1 or 2, characterized in that   The heat sink according to claim 1, 2 or 3, wherein the expansion / contraction part comprises a sheath part and a latch part, and the latch part is inserted into the sheath part so as to slide in both the inside and outside directions. Retention clip.   5. The heatsink retaining clip according to claim 4, wherein the clip is configured by a pair of parts separable between a sheath-like part and a latch part in the stretchable part.

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