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JP2018174218A - Fixing structure of heating component and fixing method of heating component - Google Patents

Fixing structure of heating component and fixing method of heating component Download PDF

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JP2018174218A
JP2018174218A JP2017071195A JP2017071195A JP2018174218A JP 2018174218 A JP2018174218 A JP 2018174218A JP 2017071195 A JP2017071195 A JP 2017071195A JP 2017071195 A JP2017071195 A JP 2017071195A JP 2018174218 A JP2018174218 A JP 2018174218A
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heat
generating component
heat generating
fixing
insulating
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JP6872953B2 (en
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木村　友昭
Tomoaki Kimura
友昭 木村
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Mitsubishi Electric Corp
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Abstract

【課題】組み立てが容易であり、発熱部品と放熱板とを密着させるとともに固定金具と発熱部品との絶縁距離を確保することが可能な発熱部品の固定構造を得ること。【解決手段】放熱板１と、放熱板１の一面上に配置された絶縁放熱シート２と、放熱面３ｃが絶縁放熱シート２と対向した状態で絶縁放熱シート２上に配置された発熱部品３と、放熱板１に発熱部品３を固定する固定金具５と、を有する。固定金具５は、一端側に設けられ、一面に固定される固定部５ａと、固定部５ａから延在して他端側に設けられ、発熱部品３における放熱板１側と反対方向を向く背面３ｄ側から発熱部品３をバネ性によって放熱板１側に押圧して固定する押圧部５ｂと、を有し、絶縁放熱シート２は、一面の面内方向において固定金具５の固定部５ａ側の端部に、一面から離れる方向に立ち上がった立ち上がり部２２を有する。【選択図】図２An object of the present invention is to provide a fixing structure for a heat generating component that is easy to assemble and that allows the heat generating component and the heat dissipation plate to be in close contact with each other and can secure an insulation distance between the fixing bracket and the heat generating component. A heat dissipation plate, an insulating heat dissipating sheet disposed on one surface of the heat dissipating plate, and a heat generating component disposed on the insulating heat dissipating sheet with the heat dissipating surface facing the insulating heat dissipating sheet. And a fixture 5 for fixing the heat generating component 3 to the heat sink 1. The fixing bracket 5 is provided on one end side, a fixing portion 5a that is fixed to one surface, a rear surface that extends from the fixing portion 5a and is provided on the other end side, and faces the opposite direction to the heat radiating plate 1 side in the heat generating component 3. A pressing portion 5b that presses and fixes the heat generating component 3 from the 3d side to the heat radiating plate 1 side by a spring property, and the insulating heat radiating sheet 2 is disposed on the fixing portion 5a side of the fixing bracket 5 in the in-plane direction. The end portion has a rising portion 22 that rises in a direction away from one surface. [Selection] Figure 2

Description

本発明は、発熱部材を放熱板に固定する発熱部品の固定構造および発熱部品の固定方法に関する。   The present invention relates to a fixing structure for a heat generating component for fixing a heat generating member to a heat radiating plate, and a fixing method for the heat generating component.

発熱部品の中でも発熱量の多い電力半導体素子は、発熱された熱を放熱させるために放熱板が取り付けられて用いられる。放熱板は、放熱効率を高めるために直接筐体と接続され、筐体は感電防止のためアース電位となっていることから、電力半導体素子と、電力半導体素子と異電位となっている放熱板との間に絶縁放熱シートが挿入されている。さらに、電力半導体素子と絶縁放熱シートと放熱板との密着性を高めるために、取付金具によって電力半導体素子が放熱板に押さえつけられている。このとき、電力半導体素子と、放熱板および取付金具とは異電位となるため、平坦な絶縁放熱シートを曲げて異電位である電力半導体素子を包みこむことで、絶縁を確保する。   A power semiconductor element that generates a large amount of heat among heat generating components is used with a heat sink attached to dissipate the heat generated. The heat sink is directly connected to the case to increase heat dissipation efficiency, and the case is at ground potential to prevent electric shock. Therefore, the power semiconductor element and the heat sink that has a different potential from the power semiconductor element Insulating heat dissipation sheet is inserted between the two. Furthermore, in order to improve the adhesion between the power semiconductor element, the insulating heat radiation sheet, and the heat sink, the power semiconductor element is pressed against the heat sink by the mounting bracket. At this time, since the power semiconductor element and the heat radiating plate and the mounting bracket have different potentials, insulation is ensured by bending a flat insulating heat radiating sheet and enclosing the power semiconductor elements having different potentials.

特許文献１には、半導体素子を取付金具により半導体素子の放熱板とは反対側の面から押さえ込むようにして放熱板へ取り付けた半導体素子の放熱板への固定構造であり、半導体素子と放熱板との間および取付金具と半導体素子との間に絶縁シートを介在させた半導体素子の放熱板への固定構造が開示されている。   Patent Document 1 discloses a structure for fixing a semiconductor element to a heat radiating plate attached to the heat radiating plate by pressing the semiconductor element from a surface opposite to the heat radiating plate of the semiconductor element with a mounting bracket. And a fixing structure of a semiconductor element to a heat sink with an insulating sheet interposed between the mounting bracket and the semiconductor element.

実開昭６２−１６８６５１号公報Japanese Utility Model Publication No. 62-168651

しかしながら、上記従来の技術によれば、組み立て作業において絶縁放熱シートと取付金具とを用いて半導体素子を放熱板に取り付けるとき、まず放熱板の上に絶縁放熱シートを敷き、その上に半導体素子を乗せる。つぎに、絶縁放熱シートの端を掴んで半導体素子の上まで折り返す形で絶縁放熱シートを折り曲げる。そして、絶縁放熱シートを掴んで折り曲げた状態を維持しながら取付金具を持ち、さらにドライバーとネジとを持って取付金具を取り付ける必要があった。このため、同時に複数のものを保持する作業が必要となり、組み立て作業が困難である、という問題があった。   However, according to the above conventional technique, when the semiconductor element is attached to the heat radiating plate using the insulating heat radiating sheet and the mounting bracket in the assembly work, first, the insulating heat radiating sheet is laid on the heat radiating plate, and the semiconductor element is placed thereon. Put it on. Next, the insulating heat radiating sheet is folded in such a manner that the end of the insulating heat radiating sheet is grasped and folded over the semiconductor element. Then, it is necessary to hold the mounting bracket while holding the insulating heat-dissipating sheet and maintaining the folded state, and to mount the mounting bracket with a screwdriver and screws. For this reason, there is a problem that an operation for holding a plurality of objects at the same time is required, and an assembling operation is difficult.

また、放熱特性を低下させないためには半導体素子と絶縁放熱シートと放熱板とを十分に密着させるための押さえつけ力が必要である。これは、半導体素子の絶縁放熱シートとの接触面および絶縁放熱シートの半導体素子との接触面には凹凸があるため、押さえつけ力が不足すれば放熱経路に空気が介在して接触熱抵抗が上がり、放熱を妨げるためである。特に大電力用途の半導体素子においては大量の熱を筐体外へ放熱しなればならないことから、接触熱抵抗を下げるために強力な押さえつけ力が必要となるため、取付金具の支点をできるだけ半導体素子の押さえ位置に近づけることが重要となる。しかし、異電位である電力半導体素子と取付金具を接近させると絶縁距離不足となり、絶縁距離と押さえつけ力の両立が困難という問題点があった。   Further, in order not to deteriorate the heat dissipation characteristics, a pressing force is required to sufficiently adhere the semiconductor element, the insulating heat dissipation sheet, and the heat dissipation plate. This is because the contact surface of the semiconductor element with the insulating heat dissipation sheet and the contact surface of the insulating heat dissipation sheet with the semiconductor element have irregularities, so if the pressing force is insufficient, air is interposed in the heat dissipation path and the contact thermal resistance increases. This is to prevent heat dissipation. In particular, in semiconductor elements for high power applications, a large amount of heat must be dissipated outside the housing, so a strong pressing force is required to reduce the contact thermal resistance. It is important to bring it closer to the holding position. However, when the power semiconductor element having a different potential is brought close to the mounting bracket, the insulation distance becomes insufficient, and it is difficult to achieve both the insulation distance and the pressing force.

本発明は、上記に鑑みてなされたものであって、固定金具によって発熱部品が放熱板に固定された発熱部品の固定構造において、組み立てが容易であり、発熱部品と放熱板とを密着させるとともに固定金具と発熱部品との絶縁距離を確保することが可能な発熱部品の固定構造を得ることを目的とする。   The present invention has been made in view of the above, and in the fixing structure of the heat generating component in which the heat generating component is fixed to the heat radiating plate by the fixing bracket, the assembly is easy, and the heat generating component and the heat radiating plate are brought into close contact with each other. It is an object of the present invention to obtain a heat generating component fixing structure capable of securing an insulation distance between the fixing bracket and the heat generating component.

上述した課題を解決し、目的を達成するために、本発明にかかる発熱部品の固定構造は、放熱板と、放熱板の一面上に配置された絶縁放熱シートと、放熱面が絶縁放熱シートと対向した状態で絶縁放熱シート上に配置された発熱部品と、放熱板に発熱部品を固定する固定金具と、を有する。固定金具は、一端側に設けられ、一面に固定される固定部と、固定部から延在して他端側に設けられ、発熱部品における放熱板側と反対方向を向く背面側から発熱部品をバネ性によって放熱板側に押圧して固定する押圧部と、を有し、絶縁放熱シートは、一面の面内方向において固定金具の固定部側の端部に、一面から離れる方向に立ち上がった立ち上がり部を有する。   In order to solve the above-described problems and achieve the object, the fixing structure of the heat generating component according to the present invention includes a heat radiating plate, an insulating heat radiating sheet disposed on one surface of the heat radiating plate, and a heat radiating surface of the insulating heat radiating sheet. A heat generating component disposed on the insulating heat dissipating sheet in an opposed state, and a fixing bracket for fixing the heat generating component to the heat radiating plate. The fixing bracket is provided on one end side, fixed to one surface, and extends from the fixing portion and provided on the other end side.The heating component is attached to the heat generating component from the back side facing away from the heat sink side. The insulating heat radiating sheet rises up in the direction away from the one surface at the end of the fixing bracket in the in-plane direction of the one surface. Part.

本発明によれば、固定金具によって発熱部品が放熱板に固定された発熱部品の固定構造において、組み立てが容易であり、発熱部品と放熱板とを密着させるとともに固定金具と発熱部品との絶縁距離を確保することが可能な発熱部品の固定構造が得られる、という効果を奏する。   According to the present invention, in the fixing structure of the heat generating component in which the heat generating component is fixed to the heat radiating plate by the fixing bracket, the assembly is easy, the heat generating component and the heat radiating plate are in close contact, and the insulation distance between the fixing metal fitting and the heat generating component is There is an effect that a fixing structure of the heat generating component capable of ensuring the above is obtained.

本発明の実施の形態１にかかる発熱部品の固定構造を示す模式斜視図1 is a schematic perspective view showing a fixing structure of a heat generating component according to a first embodiment of the present invention. 本発明の実施の形態１にかかる発熱部品の固定構造を示す断面図であり、図１における線分ＩＩ−ＩＩ線における断面図It is sectional drawing which shows the fixation structure of the heat-emitting component concerning Embodiment 1 of this invention, and sectional drawing in the line segment II-II in FIG. 本発明の実施の形態１にかかる発熱部品の固定構造に用いられる絶縁放熱シートを示す上面図The top view which shows the insulation thermal radiation sheet used for the fixing structure of the heat-emitting component concerning Embodiment 1 of this invention. 本発明の実施の形態１にかかる発熱部品の固定構造に用いられる絶縁放熱シートを示す断面図であり、図３における線分ＩＶ−ＩＶ線における断面図FIG. 4 is a cross-sectional view showing an insulating heat-radiating sheet used for the heat-generating component fixing structure according to the first embodiment of the present invention, and is a cross-sectional view taken along line IV-IV in FIG. 本発明の実施の形態１にかかる発熱部品の固定構造の形成方法を示す斜視図The perspective view which shows the formation method of the fixing structure of the heat-emitting component concerning Embodiment 1 of this invention. 本発明の実施の形態１にかかる発熱部品の固定構造の形成方法を示す斜視図The perspective view which shows the formation method of the fixing structure of the heat-emitting component concerning Embodiment 1 of this invention. 本発明の実施の形態１にかかる発熱部品の固定構造の形成方法を示す斜視図The perspective view which shows the formation method of the fixing structure of the heat-emitting component concerning Embodiment 1 of this invention. 発熱部品を一方向に連続的に配置することを想定した発熱部品の固定構造の斜視図A perspective view of the fixing structure of the heat generating component assuming that the heat generating component is continuously arranged in one direction. 本発明の実施の形態２にかかる発熱部品の固定構造を示す断面図Sectional drawing which shows the fixation structure of the heat-emitting component concerning Embodiment 2 of this invention.

以下に、本発明の実施の形態にかかる発熱部品の固定構造および発熱部品の固定方法を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Hereinafter, a fixing structure of a heat generating component and a fixing method of the heat generating component according to the embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態１．
図１は、本発明の実施の形態１にかかる発熱部品の固定構造を示す模式斜視図である。図２は、本発明の実施の形態１にかかる発熱部品の固定構造を示す断面図であり、図１における線分ＩＩ−ＩＩ線における断面図である。図３は、本発明の実施の形態１にかかる発熱部品の固定構造に用いられる絶縁放熱シートを示す上面図である。図４は、本発明の実施の形態１にかかる発熱部品の固定構造に用いられる絶縁放熱シートを示す断面図であり、図３における線分ＩＶ−ＩＶ線における断面図である。本実施の形態１にかかる発熱部品の固定構造は、放熱板１と、放熱板１の一面１ａ上に配置された絶縁放熱シート２と、放熱面３ｃが絶縁放熱シート２と対向した状態で絶縁放熱シート２上に配置された発熱部品３と、放熱板１に発熱部品３を固定する固定金具５と、により構成される。 Embodiment 1 FIG.
FIG. 1 is a schematic perspective view showing a heat generating component fixing structure according to a first embodiment of the present invention. 2 is a cross-sectional view showing the fixing structure of the heat generating component according to the first embodiment of the present invention, and is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a top view showing an insulating heat radiating sheet used in the heat generating component fixing structure according to the first embodiment of the present invention. 4 is a cross-sectional view showing an insulating heat-radiating sheet used in the structure for fixing a heat-generating component according to Embodiment 1 of the present invention, and is a cross-sectional view taken along line IV-IV in FIG. The fixing structure of the heat generating component according to the first embodiment is insulated with the heat radiating plate 1, the insulating heat radiating sheet 2 disposed on one surface 1 a of the heat radiating plate 1, and the heat radiating surface 3 c facing the insulating heat radiating sheet 2. The heat generating component 3 is disposed on the heat radiating sheet 2, and the fixing metal 5 that fixes the heat generating component 3 to the heat radiating plate 1.

放熱板１は、一面１ａの外形形状が長方形状とされた平板状を有し、アルミニウムに代表される熱伝導性の高い金属材料により構成されたヒートシンクである。放熱板１は、載置面である一面１ａ上に絶縁放熱シート２、発熱部品３および固定金具５が載置される。放熱板１の一面１ａには、固定金具５をネジ６でネジ固定するためのネジ孔１ｂが設けられている。   The heat radiating plate 1 is a heat sink made of a metal material having high thermal conductivity typified by aluminum and having a flat plate shape whose outer surface 1a has a rectangular outer shape. The heat radiating plate 1 has an insulating heat radiating sheet 2, a heat generating component 3, and a fixture 5 mounted on one surface 1 a that is a mounting surface. On one surface 1 a of the heat radiating plate 1, screw holes 1 b for fixing the fixing bracket 5 with screws 6 are provided.

また、放熱板１における一面１ａには、第１の方向において既定の距離だけ離間した位置に、一面１ａと垂直な方向に突出した２つの突起部である円柱１ｃが設けられている。第１の方向は、図１におけるＹ方向に対応する。第１の方向において２つの円柱１ｃが離間している既定の距離は、２つの円柱１ｃの間に発熱部材を配置可能な距離とされており、第１の方向における発熱部品３の幅寸法よりも長い距離とされている。また、第１の方向において、１つの円柱１ｃと発熱部品３との距離は、円柱１ｃと発熱部品３の放熱面３ｃとの絶縁を確保できる距離とされる。円柱１ｃは、放熱板１における一面１ａにおいて少なくとも２つ設けられる。また、放熱板１の面方向において第１の方向と直交する第２の方向において、２つの円柱１ｃの位置は同じ位置であってもよく、異なる位置であってもよい。第２の方向は、図１におけるＸ方向に対応する。なお、２つの円柱１ｃの端面にはネジ孔が設けられている。   In addition, the one surface 1a of the heat radiating plate 1 is provided with a column 1c that is two protrusions protruding in a direction perpendicular to the one surface 1a at a position separated by a predetermined distance in the first direction. The first direction corresponds to the Y direction in FIG. The predetermined distance in which the two cylinders 1c are separated in the first direction is a distance at which the heat generating member can be disposed between the two cylinders 1c, and is based on the width dimension of the heat generating component 3 in the first direction. Even long distances. In the first direction, the distance between one column 1c and the heat generating component 3 is a distance that can ensure insulation between the column 1c and the heat radiating surface 3c of the heat generating component 3. At least two cylinders 1 c are provided on one surface 1 a of the heat radiating plate 1. Moreover, in the 2nd direction orthogonal to a 1st direction in the surface direction of the heat sink 1, the position of the two cylinders 1c may be the same position, and may be a different position. The second direction corresponds to the X direction in FIG. In addition, the screw hole is provided in the end surface of the two cylinders 1c.

絶縁放熱シート２は、面方向における外形形状が長方形状とされ、絶縁性を有する樹脂材料によって形成されて、放熱板１の一面１ａと発熱部品３との間に配置されている。放熱板１の一面１ａの面方向において、絶縁放熱シート２の外形寸法は、放熱板１の一面１ａよりも小さく、発熱部品３よりも大きい。すなわち、絶縁放熱シート２は、放熱板１上において、放熱板１の一面１ａの面内に包含され、且つ放熱板１の一面１ａの面内において発熱部品３を包含する領域に配置されている。   The insulating heat radiating sheet 2 has a rectangular outer shape in the surface direction, is formed of an insulating resin material, and is disposed between the one surface 1 a of the heat radiating plate 1 and the heat generating component 3. In the surface direction of the one surface 1 a of the heat radiating plate 1, the external dimensions of the insulating heat radiating sheet 2 are smaller than the one surface 1 a of the heat radiating plate 1 and larger than the heat generating component 3. That is, the insulating heat radiating sheet 2 is included on the heat radiating plate 1 in a region of the one surface 1 a of the heat radiating plate 1 and in a region including the heat generating component 3 in the surface of the one surface 1 a of the heat radiating plate 1. .

絶縁放熱シート２は、放熱板１の一面１ａに接触して放熱板１の一面１ａと平行に配置されて平坦形状を有する平坦部２１と、平坦部２１の第１辺部２１ａから延びて一面１ａから離れる方向に立ち上がった立ち上がり部２２と、を有する。立ち上がり部２２が延びる平坦部２１の第１辺部２１ａは、第２の方向の一端部である。したがって、絶縁放熱シート２は、平坦部２１の第１辺部２１ａを基点として折り曲げられて、第１の方向に沿ってみた場合にＬ型に成形されたＬ型形状を有している。Ｌ型形状における立ち上がり部２２は、放熱板１の一面１ａ上に配置された状態において、放熱板１の一面１ａから垂直方向に立ち上がった直立形状となっている。   The insulating heat radiating sheet 2 is in contact with the one surface 1a of the heat radiating plate 1 and is arranged in parallel with the one surface 1a of the heat radiating plate 1, and has a flat portion 21 having a flat shape, and extends from the first side portion 21a of the flat portion 21. And a rising portion 22 rising in a direction away from 1a. The first side portion 21a of the flat portion 21 from which the rising portion 22 extends is one end portion in the second direction. Therefore, the insulating heat radiating sheet 2 has an L shape that is bent with the first side 21a of the flat portion 21 as a base point and is formed into an L shape when viewed along the first direction. The rising portion 22 in the L shape has an upright shape that rises in a vertical direction from the one surface 1a of the heat sink 1 when it is disposed on the one surface 1a of the heat sink 1.

なお、立ち上がり部２２の折り曲げ形状は、必ずしも放熱板１の一面１ａから垂直方向に立ち上がった直立形状に限定されない。立ち上がり部２２の折り曲げ形状は、一面１ａに対する垂直方向から第２の方向における一方の方向に多少傾いた折り曲げ形状とされてもよい。   The bent shape of the rising portion 22 is not necessarily limited to the upright shape rising in the vertical direction from the one surface 1a of the heat radiating plate 1. The bent shape of the rising portion 22 may be a bent shape that is slightly inclined from the direction perpendicular to the surface 1a to one direction in the second direction.

また、立ち上がり部２２は、本実施の形態１にかかる発熱部品の固定構造を組み立てる前に、あらかじめ平坦部２１の第１辺部２１ａから平坦部２１に対して垂直方向に折り曲げられてＬ型形状に形成されている。   Further, before assembling the heat generating component fixing structure according to the first embodiment, the rising portion 22 is bent in the vertical direction from the first side portion 21a of the flat portion 21 to the flat portion 21 in advance. Is formed.

また、絶縁放熱シート２は、放熱板１の一面１ａ上の既定の位置に配置された際に放熱板１の円柱１ｃと重なる位置に、円柱１ｃと同じ直径を有する２つの円形の貫通孔２ａが設けられている。２つの貫通孔２ａは、第１の方向において、２つの円柱１ｃ間と同じ間隔で離間した位置に設けられている。絶縁放熱シート２の貫通孔２ａに放熱板１の円柱１ｃを通すことによって、絶縁放熱シート２の放熱板１上における位置決めがなされる。すなわち、絶縁放熱シート２の貫通孔２ａに円柱１ｃを挿通させることで、放熱板１上における既定の位置に、簡単に絶縁放熱シート２を配置することが可能とされている。なお、貫通孔２ａに円柱１ｃを通し易くするために、貫通孔２ａの直径を円柱の直径に対して余裕を持たせて大きめにしてもよい。   Further, the insulating heat radiating sheet 2 has two circular through holes 2a having the same diameter as the column 1c at a position overlapping the column 1c of the heat radiating plate 1 when arranged at a predetermined position on the one surface 1a of the heat radiating plate 1. Is provided. The two through holes 2a are provided at positions spaced apart at the same interval as the distance between the two cylinders 1c in the first direction. By passing the column 1c of the heat radiating plate 1 through the through hole 2a of the insulating heat radiating sheet 2, the insulating heat radiating sheet 2 is positioned on the heat radiating plate 1. That is, the insulating heat radiating sheet 2 can be easily disposed at a predetermined position on the heat radiating plate 1 by inserting the column 1 c through the through hole 2 a of the insulating heat radiating sheet 2. In addition, in order to make it easy to pass the cylinder 1c through the through hole 2a, the diameter of the through hole 2a may be increased with a margin with respect to the diameter of the cylinder.

発熱部品３は、例えば電源装置に適用されるパワー半導体素子である。ただし、発熱部品３は、パワー半導体素子に限定されず、放熱板１による放熱が必要とされる発熱を伴う半導体素子を適用できる。   The heat generating component 3 is a power semiconductor element applied to, for example, a power supply device. However, the heat generating component 3 is not limited to a power semiconductor element, and a semiconductor element with heat generation that requires heat dissipation by the heat sink 1 can be applied.

発熱部品３は、素子が樹脂封止されてなり直方体形状を有する本体部である樹脂封止部と、樹脂封止部の第１側面３ａから樹脂封止部の外部に延びて設けられて発熱部品３の外部と電気的に接続するための端子４と、を有している。放熱板１の一面１ａの面内方向において第１側面３ａと反対側を向く発熱部品３の第２側面３ｂは、絶縁放熱シート２の立ち上がり部２２に接触している。また、発熱部品３は、放熱面３ｃが絶縁放熱シート２と密着した状態で、放熱板１側と反対方向を向く背面３ｄ側から固定金具５によって放熱板１側に押圧されて固定されている。   The heat generating component 3 is provided with a resin sealing portion which is a main body portion having a rectangular parallelepiped shape with an element sealed with a resin, and extends from the first side surface 3a of the resin sealing portion to the outside of the resin sealing portion to generate heat. And a terminal 4 for electrically connecting to the outside of the component 3. The second side surface 3b of the heat generating component 3 facing the opposite side to the first side surface 3a in the in-plane direction of the one surface 1a of the heat radiating plate 1 is in contact with the rising portion 22 of the insulating heat radiating sheet 2. Further, the heat generating component 3 is fixed by being pressed to the heat radiating plate 1 side by the fixing bracket 5 from the back surface 3d side facing the heat radiating plate 1 side in a state where the heat radiating surface 3c is in close contact with the insulating heat radiating sheet 2. .

固定金具５は、放熱板１に固定された状態で発熱部品３を絶縁放熱シート２とともに放熱板１上に固定するための固定部品であり、いわゆる板ばねの機能を有している。固定金具５は、固定金具５の一端側に設けられて一面１ａと平行に設けられた固定部５ａと、第２の方向において固定部５ａから発熱部品３側に延在して固定金具５の他端側に設けられて発熱部品３における背面３ｄ側から発熱部品３を放熱板１側に押圧して固定する押圧部５ｂと、を有する。   The fixing bracket 5 is a fixing component for fixing the heat generating component 3 on the heat radiating plate 1 together with the insulating heat radiating sheet 2 while being fixed to the heat radiating plate 1, and has a function of a so-called leaf spring. The fixing bracket 5 is provided on one end side of the fixing bracket 5 and is provided in parallel with the one surface 1a. The fixing bracket 5 extends from the fixing portion 5a to the heat generating component 3 side in the second direction. A pressing portion 5b that is provided on the other end side and presses and fixes the heat generating component 3 to the heat radiating plate 1 from the back surface 3d side of the heat generating component 3;

固定部５ａは、平板状を有し、固定金具５を放熱板１に固定するためのネジ６を挿通させる貫通孔５ｃが設けられている。   The fixing portion 5a has a flat plate shape, and is provided with a through hole 5c through which a screw 6 for fixing the fixing bracket 5 to the heat radiating plate 1 is inserted.

押圧部５ｂは、発熱部品３を背面３ｄ側から押さえつけるために、一面１ａと垂直な方向において一面１ａから離れる方向に、固定部５ａにおける発熱部品３側の端部から屈曲して発熱部品３の高さを超える位置まで延び、さらに一面１ａに近づく方向に屈曲した屈曲形状を有する。すなわち、押圧部５ｂは、図２において、固定部５ａの端部から上方へ折れ曲がり、発熱部品３の高さを超えた位置からさらに折れ曲がってゆるやかに下方へ向かう形状となっている。また、押圧部５ｂの先端部分は、わずかに上方へ屈曲しており、屈曲している部分における一面１ａ側の部分が発熱部品３を背面３ｄと接触する接触部５ｄとなる。   The pressing portion 5b bends from the end of the fixing portion 5a on the heat generating component 3 side in a direction perpendicular to the one surface 1a in order to press the heat generating component 3 from the back surface 3d side. It has a bent shape that extends to a position exceeding the height and is bent in a direction approaching the one surface 1a. That is, in FIG. 2, the pressing portion 5 b is bent upward from the end of the fixing portion 5 a, and further bent from a position exceeding the height of the heat generating component 3, and has a shape gradually moving downward. Further, the tip portion of the pressing portion 5b is slightly bent upward, and the portion on the one surface 1a side in the bent portion becomes the contact portion 5d that contacts the heat generating component 3 with the back surface 3d.

固定金具５において、発熱部品３を背面３ｄ側上部から押さえつけるための押圧部５ｂは、第１の方向において二股に分割されている。押圧部５ｂは、第１の方向において二股に分割されることで、放熱板１側に押さえつける押さえつけ力を第１の方向において離間した２点から発熱部品３に対して与えることができる。これにより、固定金具５は、発熱部品３の一部が絶縁放熱シート２上で浮き上がることを防止して、発熱部品３を均一に且つ確実に絶縁放熱シート２に押さえつけることができる。   In the fixing bracket 5, the pressing portion 5b for pressing the heat generating component 3 from the upper part on the back surface 3d side is divided into two forks in the first direction. The pressing portion 5b is divided into two forks in the first direction, so that a pressing force for pressing against the heat radiating plate 1 can be applied to the heat generating component 3 from two points separated in the first direction. Thereby, the fixing bracket 5 can prevent a part of the heat generating component 3 from floating on the insulating heat radiating sheet 2, and can press the heat generating component 3 uniformly and surely against the insulating heat radiating sheet 2.

絶縁放熱シート２上に発熱部品３が配置されていない状態では、一面１ａと垂直な方向において、固定金具５の押圧部５ｂの接触部５ｄと絶縁放熱シートの上面２ｂとの距離は、発熱部品３の厚みよりも小さい寸法となる。そして、固定金具５の押圧部５ｂは、絶縁放熱シート２上に発熱部品３が配置されている状態では、一面１ａと垂直な方向において、絶縁放熱シート２から離れる方向、すなわち放熱板１から離れる方向の応力が掛かるため、反力で発熱部品３を絶縁放熱シート２側に押さえつける力、すなわち放熱板１側に押さえ付ける力を発熱部品３に与える。すなわち、固定金具５は、バネ性を有し、発熱部品３を放熱板１に向けて付勢する付勢部品としての機能を有する。   In a state where the heat generating component 3 is not disposed on the insulating heat radiating sheet 2, the distance between the contact portion 5d of the pressing portion 5b of the fixing bracket 5 and the upper surface 2b of the insulating heat radiating sheet in the direction perpendicular to the surface 1a is the heat generating component. The dimension is smaller than the thickness of 3. The pressing portion 5b of the fixing metal 5 is away from the insulating heat radiating sheet 2, that is, away from the heat radiating plate 1 in a direction perpendicular to the one surface 1a in a state where the heat generating component 3 is disposed on the insulating heat radiating sheet 2. Since the stress in the direction is applied, a force for pressing the heat generating component 3 against the insulating heat radiating sheet 2 side by a reaction force, that is, a force for pressing the heat generating component 3 on the heat radiating plate 1 side is given to the heat generating component 3. That is, the fixing bracket 5 has a spring property and functions as an urging component that urges the heat generating component 3 toward the heat radiating plate 1.

なお、固定金具５の形状は、固定金具５を放熱板１へ取り付ける位置が、第２の方向において立ち上がり部２２を挟んで発熱部品３と反対側にあり、発熱部品３を放熱板１に向けて付勢できれば、特に限定されない。   The shape of the fixing bracket 5 is such that the position where the fixing bracket 5 is attached to the heat radiating plate 1 is on the opposite side of the heat generating component 3 across the rising portion 22 in the second direction, and the heat generating component 3 faces the heat radiating plate 1. If it can energize, it will not specifically limit.

なお、絶縁放熱シート２の立ち上がり部２２は、図２に示すようにＬ型部分における立ち上がり部２２の起点、すなわちＬ型形状の折り曲げ部の外周部の厚みを、立ち上がり部２２における他の部分よりも厚くして、折り曲げ部の強度を補強することが好ましい。これにより、絶縁放熱シート２が、発熱部品３を押圧する応力が原因で、立ち上がり部２２の起点の内側から裂けることを防止できる。   As shown in FIG. 2, the rising portion 22 of the insulating heat radiation sheet 2 has a starting point of the rising portion 22 in the L-shaped portion, that is, the thickness of the outer peripheral portion of the bent portion of the L-shaped portion as compared with other portions in the rising portion 22. It is preferable to reinforce the strength of the bent portion. Thereby, it can prevent that the insulation thermal radiation sheet 2 tears from the inner side of the starting point of the standup | rising part 22 due to the stress which presses the heat-emitting component 3. FIG.

以下、上述したように、発熱部品３と絶縁放熱シート２と、および絶縁放熱シート２と放熱板１とが密着した状態で、固定金具５によって発熱部品３と絶縁放熱シート２とが放熱板１に固定されて一体となったものを半導体アッセンブリーと呼ぶ。   Hereinafter, as described above, the heat generating component 3 and the insulating heat radiating sheet 2, and the heat radiating component 3 and the insulating heat radiating sheet 2 are connected to the heat radiating plate 1 by the fixing bracket 5 while the insulating heat radiating sheet 2 and the heat radiating plate 1 are in close contact with each other. What is fixed and integrated with each other is called a semiconductor assembly.

半導体アッセンブリーは、最終的に、一面１ａと垂直な方向において固定金具５側に配置される図示しないプリント基板に組み付けて固定される。半導体アッセンブリーは、発熱部品３の端子４がプリント基板のスルーホールに挿入され、プリント基板とをネジ止めすることでプリント基板に固定される。さらに、発熱部品３の端子４はプリント基板にはんだ付けされる。円柱１ｃは、固定金具５がプリント基板と接触しない高さに設定される。   The semiconductor assembly is finally assembled and fixed to a printed board (not shown) arranged on the fixing metal 5 side in a direction perpendicular to the one surface 1a. The semiconductor assembly is fixed to the printed circuit board by inserting the terminal 4 of the heat generating component 3 into the through hole of the printed circuit board and screwing it to the printed circuit board. Further, the terminals 4 of the heat generating component 3 are soldered to the printed circuit board. The column 1c is set to a height at which the fixture 5 does not contact the printed circuit board.

つぎに、本実施の形態１にかかる発熱部品の固定構造の形成方法について説明する。図５から図７は、本発明の実施の形態１にかかる発熱部品の固定構造の形成方法を示す斜視図である。まず、第１工程において、図５に示すように一面１ａを上向きにして配置された放熱板１の一面１ａ上に、図６に示すように絶縁放熱シート２が載置される。このとき、絶縁放熱シート２の２つの貫通孔２ａに２つの円柱１ｃを通すことにより、絶縁放熱シート２の放熱板１上における位置決めがなされる。   Next, a method of forming the fixing structure for the heat generating component according to the first embodiment will be described. 5 to 7 are perspective views showing a method for forming the fixing structure for the heat generating component according to the first embodiment of the present invention. First, in a 1st process, as shown in FIG. 6, the insulation thermal radiation sheet 2 is mounted on one surface 1a of the heat sink 1 arrange | positioned with the one surface 1a facing upward as shown in FIG. At this time, the insulating heat radiating sheet 2 is positioned on the heat radiating plate 1 by passing the two columns 1 c through the two through holes 2 a of the insulating heat radiating sheet 2.

つぎに、第２工程において、発熱部品３における放熱面３ｃを絶縁放熱シートの上面２ｂと対向させ、放熱面３ｃと絶縁放熱シートの上面２ｂとを接触させた状態で、図７に示すように発熱部品３が絶縁放熱シート２の上に載置される。すなわち、発熱部品３は、放熱面３ｃを下向きにした状態で、絶縁放熱シート２の上に載置される。発熱部品３を絶縁放熱シート２上に配置する際は、発熱部品３を絶縁放熱シート２上に載置した後に絶縁放熱シート２上でスライドさせ、一面１ａの面内方向において第１側面３ａと反対側を向く発熱部品３の第２側面３ｂを立ち上がり部２２に突き当てることによって、容易に絶縁放熱シート２上における発熱部品３の位置決めを行うことができる。   Next, in the second step, the heat radiating surface 3c of the heat generating component 3 is opposed to the upper surface 2b of the insulating heat radiating sheet, and the heat radiating surface 3c and the upper surface 2b of the insulating heat radiating sheet are in contact with each other as shown in FIG. The heat generating component 3 is placed on the insulating heat radiating sheet 2. That is, the heat generating component 3 is placed on the insulating heat radiating sheet 2 with the heat radiating surface 3c facing downward. When disposing the heat generating component 3 on the insulating heat radiating sheet 2, the heat generating component 3 is placed on the insulating heat radiating sheet 2 and then slid on the insulating heat radiating sheet 2 so that the first side surface 3a By positioning the second side surface 3b of the heat generating component 3 facing the opposite side against the rising portion 22, the heat generating component 3 can be easily positioned on the insulating heat radiating sheet 2.

つぎに、第３工程において、固定金具５が放熱板１に固定される。すなわち、発熱部品３の上に固定金具５の押圧部５ｂを載せ、ネジ６を固定金具５の貫通孔５ｃおよび放熱板１のネジ孔１ｂに挿通して固定することで、固定金具５の固定部５ａが放熱板１にネジ固定される。これにより、絶縁放熱シート２を介して発熱部品３が放熱板１に密着固定される。なお、ネジ６による固定金具５の放熱板１への固定箇所は１箇所に限定されず、固定金具５は複数箇所で放熱板１へ固定されてもよい。以上の工程を実施することにより、図１に示すように本実施の形態１にかかる発熱部品の固定構造が得られる。   Next, in the third step, the fixture 5 is fixed to the heat sink 1. That is, the fixing member 5 is fixed by placing the pressing portion 5b of the fixing bracket 5 on the heat generating component 3 and inserting and fixing the screw 6 through the through hole 5c of the fixing bracket 5 and the screw hole 1b of the heat sink 1. The part 5a is fixed to the heat sink 1 with screws. As a result, the heat generating component 3 is tightly fixed to the heat sink 1 via the insulating heat dissipating sheet 2. In addition, the fixing location to the heat sink 1 of the fixing metal 5 with the screw 6 is not limited to one location, and the fixing metal 5 may be fixed to the heat sink 1 at a plurality of locations. By performing the above steps, the heating component fixing structure according to the first embodiment is obtained as shown in FIG.

なお、発熱部品３の背面３ｄと固定金具５の押圧部５ｂとの間の絶縁が必要な場合は、発熱部品３の背面３ｄ上に別の絶縁シートを載せてから固定金具５をネジ止めすればよい。この場合、絶縁シートが円柱１ｃと重なる位置に貫通孔を設けておくことで、絶縁放熱シート２の位置決めと同様に、絶縁シートの位置決めを容易に行うことが可能になる。   In addition, when the insulation between the back surface 3d of the heat generating component 3 and the pressing portion 5b of the fixing bracket 5 is necessary, the fixing bracket 5 is screwed after placing another insulating sheet on the back surface 3d of the heat generating component 3. That's fine. In this case, by providing a through hole at a position where the insulating sheet overlaps the column 1c, the insulating sheet can be easily positioned in the same manner as the insulating heat radiating sheet 2 is positioned.

つぎに、半導体アッセンブリーにおける各部の電位について説明する。半導体アッセンブリーの放熱板１は、アース接地された金属筐体に取り付けられた放熱用ヒートシンクに液状の放熱グリスを介して接触固定される。液状の放熱グリスを介していてもヒートシンクと放熱板１との間には直接接触する部分が生じるため、放熱板１はアース電位となる。さらに、放熱板１に取り付けられて固定金具５および固定に使用したネジ６は、いずれも強度を確保するため一般的に金属材料が使用されるため、アース電位となる。   Next, the potential of each part in the semiconductor assembly will be described. The heat dissipating plate 1 of the semiconductor assembly is fixed in contact with a heat dissipating heat sink attached to a grounded metal casing via liquid heat dissipating grease. Even though the liquid heat radiation grease is interposed, a direct contact portion is formed between the heat sink and the heat radiation plate 1, so that the heat radiation plate 1 is at ground potential. Furthermore, the fixing metal 5 attached to the heat sink 1 and the screw 6 used for fixing are both grounded because a metal material is generally used to ensure strength.

一方、プリント基板に組み付けられた半導体アッセンブリーにおいて、発熱部品３の端子４には電圧が印加される、また、端子４と内部導通している放熱面３ｃは、同じく電圧が印加される部分であるので充電部となる。   On the other hand, in the semiconductor assembly assembled on the printed circuit board, a voltage is applied to the terminal 4 of the heat generating component 3, and the heat radiating surface 3c that is internally connected to the terminal 4 is also a portion to which a voltage is applied. So it becomes a live part.

固定金具５の押さえつけ力は、第２の方向において、図２に示すように固定金具５の支点、すなわち固定部５ａのネジ６による一面１ａへの固定位置から、押圧部５ｂが発熱部品３を押さえつける位置、すなわち接触部５ｄまでの距離Ｌが短いほど強くなる。固定部５ａのネジ６による一面１ａへの固定位置は、厳密には、ネジ６における発熱部品３側の端部Ａである。発熱部品３が大電力用途の半導体素子である場合、発熱部品３の発熱量が比較的大きいため、発熱部品３と絶縁放熱シート２との密着面積、および絶縁放熱シート２と放熱板１との密着面積をできるだけ増やして発熱部品３の熱の放熱能力を高めるために、発熱部品３を強力に押さえつける必要がある。このためには、第２の方向において、固定金具５の固定部５ａのネジ６による一面１ａへの固定位置をできるだけ発熱部品３に近づけることが重要である。   In the second direction, the pressing force of the fixing bracket 5 is such that, as shown in FIG. 2, the pressing portion 5b pushes the heat generating component 3 from the fulcrum of the fixing bracket 5, that is, the fixing position of the fixing portion 5a to the one surface 1a by the screw 6. The shorter the pressing position, that is, the distance L to the contact portion 5d, the stronger. Strictly speaking, the fixing position of the fixing portion 5a to the one surface 1a by the screw 6 is the end A of the screw 6 on the heat generating component 3 side. When the heat generating component 3 is a semiconductor element for high power use, the heat generation amount of the heat generating component 3 is relatively large. Therefore, the contact area between the heat generating component 3 and the insulating heat radiating sheet 2 and In order to increase the contact area as much as possible and increase the heat dissipation capability of the heat generating component 3, it is necessary to strongly press the heat generating component 3. For this purpose, in the second direction, it is important that the fixing position of the fixing portion 5a of the fixing metal 5 to the one surface 1a by the screw 6 is as close to the heat generating component 3 as possible.

アース電位となる固定金具５と、充電部となる発熱部品３の放熱面３ｃとは異電位となるため、固定金具５と放熱面３ｃとの間には絶縁距離が必要となる。このとき、上記のように絶縁放熱シート２の立ち上がり部２２を直立形状にすることによって、発熱部品３の放熱面３ｃと固定金具５との絶縁距離Ｄを確保することができる。そして、絶縁放熱シート２の立ち上がり部２２の高さが高いほど、絶縁効果が高くなる。すなわち、本実施の形態１にかかる発熱部品の固定構造では、絶縁放熱シート２が立ち上がり部２２を備えない平坦な形状を有する場合に比べて、発熱部品３の放熱面３ｃと固定金具５との絶縁距離を長く設けることができる。絶縁距離は、立ち上がり部２２を沿面距離として考えることになるため、立ち上がり部２２の高さは、必要な絶縁距離を満たす寸法に設定される。   Since the fixing bracket 5 serving as the ground potential and the heat radiating surface 3c of the heat generating component 3 serving as the charging unit have different potentials, an insulation distance is required between the fixing bracket 5 and the heat radiating surface 3c. At this time, the insulating distance D between the heat radiation surface 3c of the heat generating component 3 and the fixing bracket 5 can be secured by making the rising portion 22 of the insulating heat radiating sheet 2 upright as described above. And the insulation effect becomes high, so that the height of the rising part 22 of the insulation heat radiation sheet 2 is high. That is, in the fixing structure of the heat generating component according to the first embodiment, the heat radiation surface 3c of the heat generating component 3 and the fixing bracket 5 are compared with the case where the insulating heat radiating sheet 2 has a flat shape without the rising portion 22. A long insulation distance can be provided. Since the insulating distance is considered as the creepage distance, the height of the rising portion 22 is set to a dimension that satisfies the required insulating distance.

上述した本実施の形態１にかかる発熱部品の固定構造では、絶縁放熱シート２にあらかじめ立ち上がり部２２が設けられていることにより、半導体アッセンブリーの組立作業時に同時に複数の部品を保持する保持行為および保持部材が不要であり、組み立て作業が容易となり、半導体アッセンブリーの組立作業性が向上する。   In the fixing structure of the heat generating component according to the first embodiment described above, since the rising portion 22 is provided in advance in the insulating heat radiating sheet 2, the holding action and holding for simultaneously holding a plurality of components during the assembly work of the semiconductor assembly. No member is required, the assembling work becomes easy, and the assembling workability of the semiconductor assembly is improved.

また、本実施の形態１にかかる発熱部品の固定構造では、一面１ａと垂直な方向における絶縁放熱シート２の立ち上がり部２２の寸法を大きくするほど絶縁距離を確保でき、第２の方向において固定金具５を発熱部品３に近づけることができる。これにより、半導体アッセンブリーにおいて、絶縁距離を確保するとともに、固定金具５の支点から発熱部品３の押さえ位置点まで距離を短くできるため、固定金具５の押さえつけ力を強化することができ、または固定金具５に要求される押さえつけ力を低くすることができる。前者によれば、発熱部品３と絶縁放熱シート２との密着面積、および絶縁放熱シート２と放熱板１との密着面積の増加により、放熱信頼性の向上効果が得られる。後者によれば、同じ押さえ付け力を実現する場合でも固定金具５の薄肉化が可能になり、固定金具５の調達性の向上、固定金具５の軽量化およびコストダウンが可能である。   Moreover, in the fixing structure of the heat generating component according to the first embodiment, the insulation distance can be secured as the dimension of the rising portion 22 of the insulating heat radiating sheet 2 in the direction perpendicular to the surface 1a is increased, and the fixing bracket in the second direction. 5 can be brought close to the heat generating component 3. As a result, in the semiconductor assembly, the insulation distance can be ensured and the distance from the fulcrum of the fixing bracket 5 to the pressing position point of the heat generating component 3 can be shortened, so that the pressing force of the fixing bracket 5 can be enhanced, or the fixing bracket The pressing force required for 5 can be reduced. According to the former, the heat radiation reliability improvement effect can be obtained by increasing the contact area between the heat generating component 3 and the insulating heat radiating sheet 2 and the contact area between the insulating heat radiating sheet 2 and the heat radiating plate 1. According to the latter, even when the same pressing force is realized, it is possible to reduce the thickness of the fixing bracket 5, improve the procurement of the fixing bracket 5, reduce the weight of the fixing bracket 5, and reduce the cost.

また、本実施の形態１にかかる発熱部品の固定構造では、絶縁放熱シート２が立ち上がり部２２を備えることで、半導体アッセンブリーの組立作業性が向上する。放熱板１の上に絶縁放熱シート２を配置する際に、絶縁放熱シートの立ち上がり部２２を位置決め用の目印として利用し、放熱板１または放熱板１と組み合わせた位置決め用治具の基準面に立ち上がり部２２が接するように絶縁放熱シート２を置くことで、絶縁放熱シートの位置を容易に決定することができる。容易に放熱板１上における絶縁放熱シート２の位置決めを行うことができ、作業性が向上する。   Moreover, in the fixing structure of the heat generating component according to the first embodiment, the insulating heat radiating sheet 2 includes the rising portion 22, so that the assembly workability of the semiconductor assembly is improved. When the insulating heat-dissipating sheet 2 is disposed on the heat sink 1, the rising portion 22 of the insulating heat-dissipating sheet is used as a positioning mark, and the heat sink 1 or the reference surface of the positioning jig combined with the heat sink 1 is used. By placing the insulating heat radiating sheet 2 so that the rising portion 22 contacts, the position of the insulating heat radiating sheet can be easily determined. The insulating heat radiating sheet 2 can be easily positioned on the heat radiating plate 1 to improve workability.

また、発熱部品３を絶縁放熱シート２上に配置する際の作業性が向上する。すなわち、発熱部品３を絶縁放熱シート２上に配置する際、絶縁放熱シート２の立ち上がり部２２を壁として利用し、発熱部品３自体または発熱部品３の配置に用いられる位置決め用治具の基準面が立ち上がり部２２に接するように発熱部品３を置くことで、特別な治工具を必要とすることなく、第２の方向において容易に絶縁放熱シート２上における発熱部品３の位置決めを行うことができ、発熱部品３を絶縁放熱シート２上に配置する際の作業性が向上する。   Moreover, workability | operativity at the time of arrange | positioning the heat-emitting component 3 on the insulation heat radiating sheet 2 improves. That is, when the heat generating component 3 is arranged on the insulating heat radiating sheet 2, the rising surface 22 of the insulating heat radiating sheet 2 is used as a wall, and the reference surface of the positioning jig used for arranging the heat generating component 3 itself or the heat generating component 3 is used. By placing the heat generating component 3 so as to be in contact with the rising portion 22, the heat generating component 3 can be easily positioned on the insulating heat radiating sheet 2 in the second direction without requiring a special tool. The workability when arranging the heat generating component 3 on the insulating heat radiating sheet 2 is improved.

なお、放熱板１の上に絶縁放熱シート２を配置する際には、絶縁放熱シート２の貫通孔２ａに放熱板１の円柱１ｃを通すことによっても、放熱板１上における既定の位置に、簡単に絶縁放熱シート２を配置することが可能とされている。   In addition, when disposing the insulating heat radiating sheet 2 on the heat radiating plate 1, even if the column 1 c of the heat radiating plate 1 is passed through the through hole 2 a of the heat radiating sheet 1, The insulating heat radiation sheet 2 can be easily arranged.

また、上記においては絶縁放熱シート２において立ち上がり部２２を一端側のみに設けており、発熱部品３の位置決めにおいては直立している立ち上がり部２２と平行な方向に発熱部品３を自由に移動させて配置できる。これにより、プリント基板に半導体アッセンブリーを組み付けるとき、発熱部品３の端子４の位置がプリント基板のスルーホールの位置と合わなかった場合に、発熱部品３の位置を絶縁放熱シート２が直立している一端と平行方向にスライドさせることが可能であり、半導体アッセンブリーを組立て直すことにより位置修正することが可能である。これによりプリント基板への半導体アッセンブリーの組み付け作業性が向上する。さらに、プリント基板側のスルーホールを長穴形状としておくことで、発熱部品３の端子４の折り曲げ部分がスプリングバックしたとしても、スルーホールへの端子４の挿入性を維持できる。   In the above, the insulating heat radiating sheet 2 is provided with the rising portion 22 only at one end side, and in positioning the heat generating component 3, the heat generating component 3 is freely moved in a direction parallel to the rising portion 22 standing upright. Can be placed. As a result, when the semiconductor assembly is assembled to the printed circuit board, if the position of the terminal 4 of the heat generating component 3 does not match the position of the through hole of the printed circuit board, the insulating heat radiating sheet 2 stands upright at the position of the heat generating component 3. The semiconductor assembly can be slid in a direction parallel to the one end, and the position can be corrected by reassembling the semiconductor assembly. This improves the workability of assembling the semiconductor assembly onto the printed circuit board. Furthermore, by making the through hole on the printed circuit board side a long hole shape, even if the bent portion of the terminal 4 of the heat generating component 3 is spring-backed, the insertability of the terminal 4 into the through hole can be maintained.

また、絶縁放熱シート２の立ち上がり部２２を絶縁放熱シート２における一端のみに限定したことにより、絶縁放熱シート２の製造方法に関しては、鋳型の中に材料を流し込み固形成形する方法以外に、絶縁放熱シートの断面形状の穴が空いた板からの材料を押出成形する方法も選択でき、鋳型に比べて金型費が安価となる。絶縁放熱シート２の位置決めに利用する貫通孔２ａは、トムソン型などで打ち抜くことにより実現できる。   In addition, by limiting the rising portion 22 of the insulating heat radiating sheet 2 to only one end of the insulating heat radiating sheet 2, the insulating heat radiating sheet 2 can be produced by a method other than the method of casting a material into a mold and performing solid molding. A method of extruding a material from a plate having a hole in the cross-sectional shape of the sheet can also be selected, and the mold cost is lower than that of the mold. The through hole 2a used for positioning the insulating heat radiation sheet 2 can be realized by punching with a Thomson type or the like.

さらに、複数の発熱部品３をアッセンブリー化する必要がある場合は、図８に示すように絶縁放熱シート２を発熱部品３の数だけ第１の方向に伸ばし、一列に並べることで実現できる。図８は、発熱部品３を一方向に連続的に配置することを想定した発熱部品の固定構造の斜視図である。この場合も、絶縁放熱シートの押出成形が適用可能である。なお、図８においては、発熱部品３の背面３ｄ上に別の絶縁シート７が載置されている。   Furthermore, when it is necessary to assemble a plurality of heat generating components 3, it can be realized by extending the insulating heat dissipating sheets 2 in the first direction by the number of heat generating components 3 and arranging them in a line as shown in FIG. FIG. 8 is a perspective view of the fixing structure of the heat generating component assuming that the heat generating component 3 is continuously arranged in one direction. Also in this case, extrusion molding of an insulating heat radiation sheet can be applied. In FIG. 8, another insulating sheet 7 is placed on the back surface 3 d of the heat generating component 3.

したがって、本実施の形態１にかかる発熱部品の固定構造によれば、組み立てが容易であり、発熱部品３と放熱板１とを密着させるとともに固定金具５と発熱部品３との絶縁距離を確保することが可能な発熱部品の固定構造が得られる。   Therefore, according to the fixing structure of the heat generating component according to the first embodiment, the assembly is easy, the heat generating component 3 and the heat radiating plate 1 are brought into close contact, and the insulation distance between the fixing bracket 5 and the heat generating component 3 is ensured. The fixing structure of the heat generating component that can be obtained is obtained.

実施の形態２．
図９は、本発明の実施の形態２にかかる発熱部品の固定構造を示す断面図である。本実施の形態２にかかる発熱部品の固定構造では、実施の形態１における絶縁放熱シート２の代わりに絶縁放熱シート３１を用いている。絶縁放熱シート３１は、実施の形態１における絶縁放熱シート２において、立ち上がり部２２の代わりに、立ち上がり部２３を備える。立ち上がり部２３は、一面１ａにおいて発熱部品３を挟んで発熱部品３と反対側の面に、一面１ａに垂直な方向における中間領域が凹形状とされた凹部を有し、凹部の端部は、第２の方向において固定部５ａ側に突出して庇状の突出部２４となっている。すなわち、立ち上がり部２３は、発熱部品３から見て外側の側面が凹形状となっている。ここで、一面１ａに垂直な方向において、立ち上がり部２３の高さは、発熱部品３の高さを超えている。 Embodiment 2. FIG.
FIG. 9 is a cross-sectional view showing the fixing structure of the heat generating component according to the second embodiment of the present invention. In the fixing structure of the heat generating component according to the second embodiment, the insulating heat radiating sheet 31 is used instead of the insulating heat radiating sheet 2 in the first embodiment. Insulating heat radiating sheet 31 includes rising portion 23 instead of rising portion 22 in insulating heat radiating sheet 2 in the first embodiment. The rising portion 23 has a concave portion having a concave shape in the middle region in the direction perpendicular to the first surface 1a on the surface opposite to the heat generating component 3 across the heat generating component 3 on the first surface 1a. In the second direction, it protrudes toward the fixed portion 5a to form a hook-like protruding portion 24. In other words, the rising portion 23 has a concave shape on the outer side as viewed from the heat generating component 3. Here, in the direction perpendicular to the surface 1 a, the height of the rising portion 23 exceeds the height of the heat generating component 3.

半導体アッセンブリーの組立が完了した後に何らかの理由で分解および再組立作業をする必要が生じた際に、分解の段階でネジ６を取り外すことでネジ孔１ｂまたはネジ６自体から切り粉が生じ、切り粉が発熱部品３と絶縁放熱シート２との間に入り込む可能性がある。この場合、再組立の段階で発熱部品３が絶縁放熱シート２に押し当てられることによって、切り粉が絶縁放熱シート２を食い破り、絶縁破壊が生じる可能性がある。   When it is necessary to disassemble and reassemble for some reason after the assembly of the semiconductor assembly is completed, chips are generated from the screw holes 1b or the screws 6 themselves by removing the screws 6 at the disassembly stage. May enter between the heat generating component 3 and the insulating heat radiation sheet 2. In this case, when the heat-generating component 3 is pressed against the insulating heat radiating sheet 2 at the reassembly stage, the chips may break the insulating heat radiating sheet 2 and cause dielectric breakdown.

半導体アッセンブリーを分解および再組立する場面とは具体的には、例えば組み立てた発熱部品３が故障していた、あるいは発熱部品３の固定位置が適切でなく、発熱部品３の端子４の先端がプリント基板に挿入できなかったために発熱部品３の位置を調整する必要がある場合である。半導体アッセンブリーの分解において固定金具５を外した際に生じた切り粉は、微細で軽く、作業者の動きによって生じる気流に乗りやすいため、組立作業時に切り粉がかからないように対策することが重要である。   Specifically, the situation where the semiconductor assembly is disassembled and reassembled, for example, the assembled heat generating component 3 has failed, or the fixing position of the heat generating component 3 is not appropriate, and the tip of the terminal 4 of the heat generating component 3 is printed. This is a case where it is necessary to adjust the position of the heat generating component 3 because it could not be inserted into the board. It is important to take measures to prevent chips from being generated during assembly work because the chips generated when the fixture 5 is removed during disassembly of the semiconductor assembly are fine and light, and are easy to ride on the airflow generated by the movement of the operator. is there.

実施の形態２にかかる発熱部品の固定構造では、立ち上がり部２３の凹形状の凹部は切り粉の受け皿となり、切り粉が発熱部品３の方へ拡散することを庇状の突出部２４によって防ぐことができる。また、一面１ａに垂直な方向において立ち上がり部２３の高さを発熱部品３より高くすることにより、突出部２４を超えて飛来した切り粉が発熱部品３の下に潜り込むことを防ぐことができる。これにより、切り粉が発熱部品３と絶縁放熱シート２との間に入り込み、再組立の段階で発熱部品３が絶縁放熱シート２に押し当てられることによって、切り粉が絶縁放熱シート２を食い破ることを防ぐことができる。   In the fixing structure of the heat generating component according to the second embodiment, the concave portion of the rising portion 23 serves as a receiving tray for the chips, and the hook-shaped protrusions 24 prevent the chips from diffusing toward the heat generating components 3. Can do. Further, by making the height of the rising portion 23 higher than that of the heat generating component 3 in the direction perpendicular to the surface 1 a, it is possible to prevent chips that have jumped over the protruding portion 24 from entering the heat generating component 3. As a result, the chips enter between the heat-generating component 3 and the insulating heat-dissipating sheet 2, and the heat-generating component 3 is pressed against the insulating heat-dissipating sheet 2 at the reassembly stage, so that the chips break the insulating heat-dissipating sheet 2. Can be prevented.

したがって、実施の形態２にかかる発熱部品の固定構造では、実施の形態１にかかる発熱部品の固定構造の効果に加え、立ち上がり部２３を備える絶縁放熱シート３１を用いることで、半導体アッセンブリーの分解および再組立作業時における切り粉に起因した絶縁破壊を防止できる。   Therefore, in the fixing structure of the heat generating component according to the second embodiment, in addition to the effect of the fixing structure of the heat generating component according to the first embodiment, by using the insulating heat radiation sheet 31 including the rising portion 23, the semiconductor assembly can be disassembled and Insulation breakdown caused by chips during reassembly can be prevented.

以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。   The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

１ 放熱板、１ａ 一面、１ｂ ネジ孔、１ｃ 円柱、２，３１ 絶縁放熱シート、２ａ 貫通孔、２ｂ 上面、３ 発熱部品、３ａ 第１側面、３ｂ 第２側面、３ｃ 放熱面、３ｄ 背面、４ 端子、５ 固定金具、５ａ 固定部、５ｂ 押圧部、５ｃ 貫通孔、５ｄ 接触部、６ ネジ、７ 絶縁シート、２１ 平坦部、２１ａ 第１辺部、２２，２３ 立ち上がり部、２４ 突出部。   DESCRIPTION OF SYMBOLS 1 Heat sink, 1a 1 surface, 1b Screw hole, 1c Cylinder, 2,31 Insulation heat radiation sheet, 2a Through-hole, 2b Top surface, 3 Heating component, 3a 1st side surface, 3b 2nd side surface, 3c Heat radiation surface, 3d Back surface, 4 Terminal 5, Fixing bracket, 5a Fixing part, 5b Pressing part, 5c Through hole, 5d Contact part, 6 Screw, 7 Insulating sheet, 21 Flat part, 21a First side part, 22, 23 Standing part, 24 Protruding part.

Claims (11)

放熱板と、
前記放熱板の一面上に配置された絶縁放熱シートと、
放熱面が前記絶縁放熱シートと対向した状態で前記絶縁放熱シート上に配置された発熱部品と、
前記放熱板に前記発熱部品を固定する固定金具と、
を有し、
前記固定金具は、
一端側に設けられ、前記一面に固定される固定部と、
前記固定部から延在して他端側に設けられ、前記発熱部品における前記放熱板側と反対方向を向く背面側から前記発熱部品をバネ性によって前記放熱板側に押圧して固定する押圧部と、
を有し、
前記絶縁放熱シートは、前記一面の面内方向において前記固定金具の前記固定部側の端部に、前記一面から離れる方向に立ち上がった立ち上がり部を有すること、
を特徴とする発熱部品の固定構造。 A heat sink,
An insulating heat dissipating sheet disposed on one surface of the heat dissipating plate;
A heat-generating component disposed on the insulating heat-radiating sheet in a state where the heat-radiating surface faces the insulating heat-radiating sheet;
A fixing bracket for fixing the heat generating component to the heat sink;
Have
The fixing bracket is
A fixing portion provided on one end side and fixed to the one surface;
A pressing portion that extends from the fixing portion and is provided on the other end side, and presses and fixes the heat generating component to the heat radiating plate side by a spring property from the back side facing the direction opposite to the heat radiating plate side in the heat generating component. When,
Have
The insulating heat-radiating sheet has a rising portion that rises in a direction away from the one surface at an end of the fixing bracket in the in-plane direction of the one surface;
A heat generating component fixing structure characterized by 前記発熱部品は、
前記発熱部品の外部と電気的に接続するための端子を第１側面に備え、
前記一面の面内方向において前記第１側面と反対側を向く第２側面が前記立ち上がり部に接触していること、
を特徴とする請求項１に記載の発熱部品の固定構造。 The heat generating component is
A terminal for electrically connecting to the outside of the heat generating component is provided on the first side surface,
A second side surface facing the opposite side of the first side surface in the in-plane direction of the one surface is in contact with the rising portion;
The fixing structure for a heat generating component according to claim 1. 前記固定金具の前記固定部は、前記一面において前記発熱部品を挟んで前記発熱部品の第１側面と反対側の領域に固定されていること、
を特徴とする請求項１または２に記載の発熱部品の固定構造。 The fixing portion of the fixing bracket is fixed to a region opposite to the first side surface of the heat generating component across the heat generating component on the one surface;
The heat generating component fixing structure according to claim 1 or 2. 前記一面に垂直な方向において、前記立ち上がり部の高さは、前記発熱部品の前記背面の高さよりも高いこと、
を特徴とする請求項１から３のいずれか１つに記載の発熱部品の固定構造。 In the direction perpendicular to the one surface, the height of the rising portion is higher than the height of the back surface of the heat generating component,
The fixing structure for a heat-generating component according to any one of claims 1 to 3. 前記立ち上がり部は、前記一面において前記発熱部品を挟んで前記発熱部品と反対側の面に、前記一面に垂直な方向における中間領域が凹形状とされた凹部を有すること、
を特徴とする請求項４に記載の発熱部品の固定構造。 The rising portion has a concave portion in which a middle region in a direction perpendicular to the one surface is a concave shape on a surface opposite to the heat generating component across the heat generating component on the one surface,
The fixing structure for a heat generating component according to claim 4. 放熱板の一面上に絶縁放熱シートを載置する第１工程と、
放熱面を前記絶縁放熱シートと対向させた状態で前記絶縁放熱シート上に発熱部品を載置する第２工程と、
前記放熱板に前記発熱部品を固定する固定金具を前記放熱板に固定する第３工程と、
を含み、
前記固定金具は、
一端側に設けられ、前記一面に固定される固定部と、
前記固定部から延在して他端側に設けられ、前記発熱部品における前記放熱板側と反対方向を向く背面側から前記発熱部品をバネ性によって前記放熱板側に押圧して固定する押圧部と、
を有し、
前記絶縁放熱シートは、前記一面の面内方向において前記固定金具の前記固定部側の端部に、前記一面から離れる方向に立ち上がった立ち上がり部を有すること、
を特徴とする発熱部品の固定方法。 A first step of placing an insulating heat dissipating sheet on one surface of the heat dissipating plate;
A second step of placing a heat-generating component on the insulating heat radiating sheet in a state where the heat radiating surface faces the insulating heat radiating sheet;
A third step of fixing a fixing bracket for fixing the heat generating component to the heat radiating plate to the heat radiating plate;
Including
The fixing bracket is
A fixing portion provided on one end side and fixed to the one surface;
A pressing portion that extends from the fixing portion and is provided on the other end side, and presses and fixes the heat generating component to the heat radiating plate side by a spring property from the back side facing the direction opposite to the heat radiating plate side in the heat generating component. When,
Have
The insulating heat-radiating sheet has a rising portion that rises in a direction away from the one surface at an end of the fixing bracket in the in-plane direction of the one surface;
A fixing method for heat-generating components. 前記発熱部品は、
前記発熱部品の外部と電気的に接続するための端子を第１側面に備え、
前記第２工程では、前記一面の面内方向において前記第１側面と反対側を向く第２側面を前記立ち上がり部に突き当てることによって前記絶縁放熱シート上における前記発熱部品の位置決めを行うこと、
を特徴とする請求項６に記載の発熱部品の固定方法。 The heat generating component is
A terminal for electrically connecting to the outside of the heat generating component is provided on the first side surface,
In the second step, the heat-generating component is positioned on the insulating heat-dissipating sheet by abutting the rising side with a second side surface facing the opposite side of the first side surface in the in-plane direction of the one surface.
The fixing method of the heat-emitting component according to claim 6. 前記第２工程では、前記固定金具の前記固定部は、前記一面において前記発熱部品を挟んで前記発熱部品の第１側面と反対側の領域に固定されること、
を特徴とする請求項６または７に記載の発熱部品の固定方法。 In the second step, the fixing portion of the fixing bracket is fixed to a region opposite to the first side surface of the heat generating component with the heat generating component sandwiched on the one surface,
The heat-generating component fixing method according to claim 6 or 7, wherein: 前記一面に垂直な方向において、前記立ち上がり部の高さは、前記発熱部品の前記背面の高さよりも高いこと、
を特徴とする請求項６から８のいずれか１つに記載の発熱部品の固定方法。 In the direction perpendicular to the one surface, the height of the rising portion is higher than the height of the back surface of the heat generating component,
The fixing method of the heat-generating component according to any one of claims 6 to 8. 前記立ち上がり部は、前記一面において前記発熱部品を挟んで前記発熱部品と反対側の面に、前記一面に垂直な方向における中間領域が凹形状とされた凹部を有すること、
を特徴とする請求項９に記載の発熱部品の固定方法。 The rising portion has a concave portion in which a middle region in a direction perpendicular to the one surface is a concave shape on a surface opposite to the heat generating component across the heat generating component on the one surface,
The heating part fixing method according to claim 9. 前記放熱板は、前記一面上に少なくとも２つの突起部が設けられ、
前記絶縁放熱シートは、前記突起部に対応する少なくとも２つの貫通孔が設けられ、
前記第１工程では、前記貫通孔に前記突起部を嵌め込むことによって前記一面上における前記絶縁放熱シートの位置決めを行うこと、
を特徴とする請求項６から１０のいずれか１つに記載の発熱部品の固定方法。 The heat radiating plate is provided with at least two protrusions on the one surface,
The insulating heat dissipation sheet is provided with at least two through holes corresponding to the protrusions,
In the first step, the insulating heat radiation sheet is positioned on the one surface by fitting the protrusion into the through hole.
The heating component fixing method according to any one of claims 6 to 10, wherein:
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021174976A (en) * 2020-04-30 2021-11-01 新電元工業株式会社 Fixing member and fixing structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021174976A (en) * 2020-04-30 2021-11-01 新電元工業株式会社 Fixing member and fixing structure
JP7525296B2 (en) 2020-04-30 2024-07-30 新電元工業株式会社 Fixing member and fixing structure

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