JP3663607B2 - Heating element fixing structure - Google Patents

Heating element fixing structure Download PDF

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Publication number
JP3663607B2
JP3663607B2 JP11310596A JP11310596A JP3663607B2 JP 3663607 B2 JP3663607 B2 JP 3663607B2 JP 11310596 A JP11310596 A JP 11310596A JP 11310596 A JP11310596 A JP 11310596A JP 3663607 B2 JP3663607 B2 JP 3663607B2
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Prior art keywords
heating element
fixing
fixing member
heat
heat generating
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Expired - Fee Related
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JP11310596A
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Japanese (ja)
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JPH09283674A (en
Inventor
正文 牛島
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Yaskawa Electric Corp
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Yaskawa Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation

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Description

【０００１】
【発明の属する技術分野】
本発明は、複数の発熱素子を同一放熱板に固定するための固定構造に関する。
【０００２】
【従来の技術】
従来、パワートランジスタやパワーＩＣなどの発熱素子を熱から保護するために、アルミニウム板などを用いて形成した放熱板に密着するように取り付け、発熱素子から発生する熱を放熱板で拡散して、発熱素子を冷却するようにしている。
その場合、例えば図３に示すように、放熱板１に発熱素子２をネジ５により直接固定する方法や、図５に示すように、放熱板１に板バネ６をネジ５で固定し、板バネ６の弾性で発熱素子２の一部を固定する方法などが開示されている（例えば、実開平１−１２３３５５号公報）。
【０００３】
【発明が解決しようとする課題】
ところが、上記従来技術では、いずれの場合も、ネジや止め具や板バネが発熱素子１個に対し１個以上必要である。そのため、発熱素子の数量が増えれば増えるほど部品点数や作業工数が増大するという問題があった。
また、いずれの場合も、発熱素子への押圧支持点が１点であるため、それぞれ図４（ａ）の状態から（ｂ）に示す状態に、また図６（ａ）の状態から（ｂ）に示す状態に、放熱板に対する発熱素子の浮き上がりが発生することがあり、発熱素子から放熱板への熱の移動の妨げとなるという問題があった。
本発明は、上記問題を解決し、部品点数、および組立て工数の少ない、伝熱効率のよい発熱素子の固定構造を提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記課題を解決するため、本発明は、弾性を有する固定部材と、前記固定部材を放熱板に固定するための固定手段とを備え、前記固定部材と前記放熱板との間に複数の発熱素子を固定するようにした発熱素子の固定構造において、前記固定部材は、前記複数の発熱素子を配列した配列方向の長さをもつ基部と、前記基部の長手方向に対して前記基部から直角方向に伸びる複数の板バネ部とからなり、かつ前記板バネ部は前記基部からの長さがそれぞれ異なり、かつ互いに間隔をあけて設けられた短冊状の板バネからなるとともに、それぞれの発熱素子に対して、長さの異なる複数の板バネで押圧したことを特徴とするものである。
【０００５】
【発明の実施の形態】
以下、本発明を図に示す実施例について説明する。
図１は本発明の実施例を示す平面図、図２はその側面図である。
図において、１は放熱板、２（２ａ，２ｂ，２ｃ，２ｄ，２ｅ，２ｆ）は複数の形状の異なる発熱素子で、各発熱素子２の端子２１はそれぞれ基板３に半田付けされている。
４は発熱素子２を放熱板１に固定するための弾性を有する板材からなる固定部材で、複数の発熱素子２を配列した配列方向の長さをもち、かつ断面がＬ字状の基部４１と、基部４１の長手方向に対して基部４１から直角方向に伸び、かつ、長さの異なる短冊状の板バネ部４２とからなっている。基部４１には取り付け穴が複数個、長手方向に沿って等間隔に設けられ、ネジ５によって基部４１を放熱板１に固定するようにしてある。
板バネ部４２は長さが異なる板バネ４２ａ，４２ｂ，４２ｃを互いに所定の間隔をあけて設けて一組として複数組設け、各組の板バネは所定のピッチで、連続的に基部４１の長手方向に配列してある。
【０００６】
発熱素子２を放熱板１に固定する場合、複数の発熱素子２は各端子２１を予め基板３に半田付けするとによって基板３に固定しておく。
この状態の発熱素子２を、放熱板１の上に重ね合わせる。次に、固定部材４を発熱素子２の配列方向に沿って配置すると共に、板バネ部４２を各発熱素子２の上に重ね合わせ、ネジ５によって放熱板１に固定する。
このとき、板バネ部４２は長さが異なる板バネ４２ａ，４２ｂ，４２ｃを設けてあるので、一つの発熱素子２に対して板バネ４２ａ，４２ｂ，４２ｃのうちの少なくとも２個は、発熱素子２の配列方向および配列方向に直角方向に異なる位置を押えることになる。例えば発熱素子２ｂでは、一つの固定部材４によって同時にＡ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，Ｇ，Ｈの８点で押えることになる。
したがって、１個の固定部材４を放熱板１に固定することにより、複数の発熱素子２を同時に放熱板１に固定することができる。
また、各発熱素子２を放熱板１に押し付ける支持点は１か所に集中することがなく、異なる位置の複数箇所で押えるので、放熱板１に対する発熱素子２の浮き上がりを防ぐことができ、各発熱素子２から放熱板１への熱伝達が妨げられることはなくなる。
また、板バネ部４２の各板バネ４２ａ，４２ｂ，４２ｃは、隣接する板バネとの間に間隔を設けてあるので、相互に他方の板バネのバネ作用の影響を受けることがなく、ぞれぞれ独立した板バネとして機能する。
なお、上記実施例では、板バネ部４２の板バネを３種類の長さのものについて説明したが、長さの種類は３個以上でもよく、長さの種類が多いほど多種類の発熱素子を固定することができる。
また、発熱素子の数量が変わっても、固定部材の長さを変えることにより簡単に対応できる。
【０００７】
【発明の効果】
以上述べたように、本発明によれば、複数個の発熱素子を同一の放熱板に１個の固定部材で同時に複数個の発熱素子を固定することができるので、固定部材の数および種類を削減でき、かつ作業工数を低減することができる。
また、１個の発熱素子に対して最低２か所を押えることができるので、押し付ける支持点の集中がなく、放熱板に対する発熱素子の浮き上がりを防ぎ、部品点数、および組立て工数の少ない、伝熱効率のよい発熱素子の固定構造を提供できる効果がある。
【図面の簡単な説明】
【図１】 本発明の実施例を示す平断面図である。
【図２】 本発明の実施例を示す側面図である。
【図３】 従来例を示す平断面図である。
【図４】 従来例を示す側面図である。
【図５】 他の従来例を示す平断面図である。
【図６】 他の従来例を示す側面図である。
【符号の説明】
１：放熱板、２、２ａ，２ｂ，２ｃ，２ｄ，２ｅ，２ｆ：発熱素子、２１：端子、３：基板、４：固定部材、４１：基部、４２：板バネ部、４２ａ，４２ｂ，４２ｃ：板バネ、５：ネジ 、６：板バネ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing structure for fixing a plurality of heating elements to the same heat radiating plate.
[0002]
[Prior art]
Conventionally, in order to protect heat generating elements such as power transistors and power ICs from heat, it is attached so as to be in close contact with a heat sink formed using an aluminum plate or the like, and heat generated from the heat generating element is diffused by the heat sink. The heating element is cooled.
In that case, for example, as shown in FIG. 3, the heat generating element 2 is directly fixed to the heat radiating plate 1 with screws 5, or the plate spring 6 is fixed to the heat radiating plate 1 with screws 5 as shown in FIG. A method of fixing a part of the heat generating element 2 by the elasticity of the spring 6 is disclosed (for example, Japanese Utility Model Laid-Open No. 1-123355).
[0003]
[Problems to be solved by the invention]
However, in any of the above prior arts, one or more screws, stoppers, and leaf springs are required for each heating element. For this reason, there is a problem that the number of parts and the number of work steps increase as the number of heating elements increases.
In any case, since the pressing support point to the heating element is one point, the state shown in FIG. 4A is changed to the state shown in FIG. 4B, and the state shown in FIG. In the state shown in FIG. 1, there is a problem that the heat generating element is lifted with respect to the heat radiating plate, which hinders heat transfer from the heat generating element to the heat radiating plate.
An object of the present invention is to solve the above problems and to provide a fixing structure of a heat generating element having a small number of parts and a small number of assembly steps and high heat transfer efficiency.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes an elastic fixing member and fixing means for fixing the fixing member to a heat sink, and a plurality of heating elements between the fixing member and the heat sink. In the fixing structure of the heating element, the fixing member includes a base portion having a length in an arrangement direction in which the plurality of heating elements are arranged, and a direction perpendicular to the longitudinal direction of the base portion from the base portion. Ri Do and a plurality of leaf spring portions extending, and together with the plate spring portion has a length from the base different to each other and made of strip-shaped plate spring provided at a distance from one another, each of the heating elements On the other hand, it is characterized by being pressed by a plurality of leaf springs having different lengths.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a side view thereof.
In the figure, 1 is a heat dissipation plate, 2 (2a, 2b, 2c, 2d, 2e, 2f) is a plurality of heat generating elements having different shapes, and the terminals 21 of each heat generating element 2 are soldered to the substrate 3, respectively.
Reference numeral 4 denotes a fixing member made of an elastic plate for fixing the heat generating element 2 to the heat radiating plate 1. The fixing member 4 has a base 41 having a length in the arrangement direction in which the plurality of heat generating elements 2 are arranged and having an L-shaped cross section. The leaf spring portion 42 has a strip shape extending in a direction perpendicular to the longitudinal direction of the base portion 41 from the base portion 41 and having a different length. A plurality of mounting holes are provided in the base portion 41 at equal intervals along the longitudinal direction, and the base portion 41 is fixed to the heat radiating plate 1 with screws 5.
The leaf spring part 42 is provided with a plurality of pairs of leaf springs 42a, 42b, 42c having different lengths at predetermined intervals, and each set of leaf springs is continuously provided at a predetermined pitch on the base 41. They are arranged in the longitudinal direction.
[0006]
When fixing the heat generating element 2 to the heat radiating plate 1, the plurality of heat generating elements 2 are fixed to the substrate 3 by soldering the terminals 21 to the substrate 3 in advance.
The heating element 2 in this state is overlaid on the heat sink 1. Next, the fixing member 4 is arranged along the arrangement direction of the heat generating elements 2, and the leaf spring portion 42 is overlaid on each heat generating element 2 and fixed to the heat radiating plate 1 with screws 5.
At this time, since the leaf spring portion 42 is provided with leaf springs 42a, 42b, and 42c having different lengths, at least two of the leaf springs 42a, 42b, and 42c with respect to one heating element 2 are heated elements. Two different arrangement directions and different positions perpendicular to the arrangement direction can be pressed. For example, in the heat generating element 2b, it is simultaneously pressed by eight points A, B, C, D, E, F, G, and H by one fixing member 4.
Therefore, by fixing one fixing member 4 to the heat radiating plate 1, a plurality of heating elements 2 can be fixed to the heat radiating plate 1 at the same time.
Further, since the supporting points for pressing each heat generating element 2 against the heat radiating plate 1 are not concentrated at one place and are pressed at a plurality of positions at different positions, it is possible to prevent the heat generating element 2 from being lifted with respect to the heat radiating plate 1. Heat transfer from the heating element 2 to the heat radiating plate 1 is not hindered.
Further, since the leaf springs 42a, 42b, 42c of the leaf spring portion 42 are spaced from the adjacent leaf springs, they are not affected by the spring action of the other leaf springs. Each functions as an independent leaf spring.
In the above-described embodiment, the leaf springs of the leaf spring portion 42 have been described with three types of lengths. However, the number of lengths may be three or more, and the more types of length, the more types of heating elements. Can be fixed.
Further, even if the number of heating elements changes, it can be easily dealt with by changing the length of the fixing member.
[0007]
【The invention's effect】
As described above, according to the present invention, since a plurality of heat generating elements can be simultaneously fixed to the same heat radiating plate with a single fixing member, the number and types of fixing members can be reduced. It can be reduced and the number of work steps can be reduced.
In addition, since at least two places can be pressed against one heating element, there is no concentration of supporting points to be pressed, and the heating element is prevented from lifting up against the heat sink, reducing the number of parts and assembly man-hours. It is possible to provide a heat generating element fixing structure that is excellent in quality.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing an embodiment of the present invention.
FIG. 2 is a side view showing an embodiment of the present invention.
FIG. 3 is a plan sectional view showing a conventional example.
FIG. 4 is a side view showing a conventional example.
FIG. 5 is a plan sectional view showing another conventional example.
FIG. 6 is a side view showing another conventional example.
[Explanation of symbols]
1: heat sink, 2, 2a, 2b, 2c, 2d, 2e, 2f: heating element, 21: terminal, 3: substrate, 4: fixing member, 41: base, 42: leaf spring, 42a, 42b, 42c : Leaf spring, 5: screw, 6: leaf spring

Claims (1)

弾性を有する固定部材と、前記固定部材を放熱板に固定するための固定手段とを備え、前記固定部材と前記放熱板との間に複数の発熱素子を固定するようにした発熱素子の固定構造において、
前記固定部材は、前記複数の発熱素子を配列した配列方向の長さをもつ基部と、前記基部の長手方向に対して前記基部から直角方向に伸びる複数の板バネ部とからなり、かつ前記板バネ部は前記基部からの長さがそれぞれ異なり、かつ互いに間隔をあけて設けられた短冊状の板バネからなるとともに、それぞれの発熱素子に対して、長さの異なる複数の板バネで押圧したことを特徴とする発熱素子の固定構造。A heating element fixing structure comprising a fixing member having elasticity and a fixing means for fixing the fixing member to a heat sink, wherein a plurality of heat generating elements are fixed between the fixing member and the heat sink. In
The fixing member includes a base portion having a length in the array direction in which an array of a plurality of heating elements, Ri Do and a plurality of leaf spring portion extending perpendicularly from said base portion with respect to the longitudinal direction of said base, and wherein The leaf springs are formed of strip-like leaf springs having different lengths from the base and spaced apart from each other, and are pressed against each heating element by a plurality of leaf springs having different lengths. A heating element fixing structure characterized by that.
JP11310596A 1996-04-09 1996-04-09 Heating element fixing structure Expired - Fee Related JP3663607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11310596A JP3663607B2 (en) 1996-04-09 1996-04-09 Heating element fixing structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11310596A JP3663607B2 (en) 1996-04-09 1996-04-09 Heating element fixing structure

Publications (2)

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JPH09283674A JPH09283674A (en) 1997-10-31
JP3663607B2 true JP3663607B2 (en) 2005-06-22

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6043981A (en) * 1997-11-13 2000-03-28 Chrysler Corporation Heat sink assembly for electrical components
WO2010119546A1 (en) * 2009-04-16 2010-10-21 三菱電機株式会社 Fitting for fixing heat producing parts
JP2013214770A (en) * 2013-07-10 2013-10-17 Mitsubishi Electric Corp Metal fitting and method for fixing heating component
JP2016025161A (en) * 2014-07-17 2016-02-08 三菱電機株式会社 Heat radiator
JP2021028923A (en) * 2019-08-09 2021-02-25 Ｋｙｂ株式会社 Fixing metal fitting and electronic component unit

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