【０００１】
【発明の属する技術分野】
本発明は、例えば、携帯電話機に用いられる送受信ユニット等の電子機器に関する。
【０００２】
【従来の技術】
図６から図８に従って従来の電子機器を説明すると、図６は従来の電子機器の斜視図、図７は従来の電子機器の一部を分解して示す斜視図、図８は従来の電子機器の要部断面図である。
これらの図において、プラスチック材料で成形されたケース４１は、底壁部４１ａと、四つの側壁部４１ｂと、底壁部４１ａに対向して上方が開放した開口部４１ｃと、底壁部４１ａに設けられた大きなきな貫通孔４１ｄと、ケーブルを引き出す貫通孔４１ｅと、大きな貫通孔４１ｄの外周部の数カ所に設けられ、大きな貫通孔４１ｄに向かって凹部をもつＬ字状の爪部４１ｆと、底壁部４１ａと同一面で、側壁部４１ｂの外側に位置する角部に設けられた耳部４１ｇと、耳部４１ｇの中央に設けられた貫通孔４１ｈと、側壁部４１ｂに設けられた内方に突出する凸部４１ｋと、凸部４１ｋ中央に設けられたネジ孔４１ｍと、ケース４１の表面全面に、メッキ等の手段によって被着された金属膜４１ｎとを有している。
【０００３】
金属板からなる矩形状の熱伝導部材４２は、平板部４２ａと、平板部４２ａの数カ所において、一部を切り欠いて上方に切り起こされた舌片４２ｄと、平板部４２ａに設けられた複数の貫通孔４３とを有している。
【０００４】
熱伝導部材４２は、舌片４２ｄの切り起こされた方向を上方に向けて、ケース４１の内部に収納され、Ｌ字状の爪部４１ｆの凹部に、平板部４２の外周部を掛け止めして取り付けられ、平板部４２ａによって、ケース４１の大きな貫通孔４１ｄを塞ぐようになっている。
このとき、ケース４１の爪部４１ｆと熱伝導部材４２の間には、爪部４１ｆの凹部の高さと熱伝導部材４２の厚さとの間において上下方向の遊びがあり、また、大きな貫通孔４１ｄを挟んで対向する爪部４１ｆ間の距離と熱伝導板４２の幅のとの間において、横方向の遊びがあり、このため、熱伝導部材４２は、ケース４１に対して、その遊び分、上下、横方向にガタツキが生ずる。
【０００５】
プリント基板４４は、貫通孔４８と、導電パターン（図示せず）とを有し、このプリント基板４４の下面４４ａには、ケーブルを接続するためのコネクタ４５及び、発熱量の大きな発熱部品４６等が設置され、また上面４４ｂには、比較的発熱量の少ない電子部品４７等が設置されている。
金属板から成る箱形の金属カバー４９は、下面が開放され、上面に複数個の貫通孔５０を有し、この金属カバー４９は、上面４４ｂの電子部品４７を覆うようにプリント基板４４に取り付けられ、金属カバー４９により上面４４ｂに設置された電子部品４７が電気的にシールドされる構成となっている。
【０００６】
また、プリント基板４４は、発熱部品４６の設置された下面４４ａを、ケース４１の底壁部４１ａに対向させ、開口部４１ｃを塞ぐようにケース４１に載置され、そして、プリント基板４４の貫通孔４８に通したネジ５１を、ケース４１の凸部４１ｋのネジ孔４１ｍにねじ込むことにより、ケース４１に取り付けられている。
そして、プリント基板４４が、ケース４１に取り付けられた状態では、熱伝導部材４２は、プリント基板４４の下面４４ａの発熱部品４６を含む領域に対向すると共に、プリント基板４４の下面４４ａに設けられた発熱部品４６の表面には、熱伝導部材４２の舌片４２ｄが接触状態となっている。
【０００７】
そして、プリント基板４４、及び熱伝導部材４２を取り付けられたケース４１は、マザー基板５２の導電パターン５２ａが形成された表面に載置され、ケース４１はマザー基板５２へ、ケース４１の耳部４１ｇの貫通孔４１ｈに通したネジ５３を、マザー基板５２に設けられたネジ孔５２ｂにねじ込みして、固定されている。
【０００８】
上記のような構成を有する電子機器は、その使用時において、発熱部品４６から発生した熱は、発熱部品４６の表面に接触した舌片４２ｄを伝わり、熱伝導部材４２の全体へと拡散し、そして、熱伝導部材４２から放熱されるようになっている。
【０００９】
【発明が解決しようとする課題】
しかしながら、従来の電子機器では、熱伝導部材４２が、ケース４１のＬ字状の爪部４１ｆに掛け止めされて取り付けられているため、爪部４１ｆと熱伝導部材４２との間にガタツキを生じ、このため、電子機器の使用時における振動、衝撃等において、熱伝導部材４２のガタツキ音が発生するという問題があった。また、熱伝導部材４２のガタツキ時、舌片４２ｄと発熱部品４６の表面との摩擦により、発熱部品４６が破損するという問題があった。
【００１０】
【課題を解決するための手段】
上記課題を解決するための第一の解決手段として、プリント基板と、該プリント基板上に設置された発熱部品と、前記プリント基板を取り付けて前記発熱部品を収納する樹脂からなるケースと、該ケースに取り付けられ、前記発熱部品と接続状態にある金属板からなる熱伝導部材とを有し、前記ケースは、先端に抜け止め部を有するＬ字型の爪部と、該爪部の両側に間隔をおいて設けられた、突起部、あるいは孔部からなる係止部とを有し、前記熱伝導部材は、貫通孔あるいは凸部からなる係止部を有し、前記熱伝導部材は側縁部が前記爪部の側部に圧接され、前記熱伝導部材の一部が前記爪部の前記抜け止め部に掛け止めされた状態で、前記ケースの前記係止部と前記熱伝導部材の前記係止部とを互いに係止させた構成とした。
【００１１】
また、第二の解決手段として、前記熱伝導部材に形成された係止部は、貫通孔で構成され、前記ケースに形成された係止部は、突起部で構成され、該突起部を前記貫通孔に貫通させて係止させる構成とした。
【００１２】
また、第三の解決手段として、前記熱伝導部材の前記側縁部には、外側に突出した突出部が間隔をおいて配設され、該突出部には、前記熱伝導部材の前記係止部を設け、また、前記突出部間の前記熱伝導部材の前記側縁部には、内側に凹んだ凹部を形成し、該凹部には、底辺から外側に突出した舌片部を形成し、前記爪部が前記凹部に嵌入された状態で、前記熱伝導部材の前記側縁部は、前記舌片部において前記爪部の前記側部に圧接され、前記熱伝導部材の前記舌片部が前記爪部の抜け止め部に掛け止めされている構成とした。
【００１３】
また、第四の解決手段として、前記熱伝導部材には、前記爪部と対向する前記側縁部近傍に、前記爪部の幅と同等か、幅広のスリットが設けられた構成とした。
【００１４】
【発明の実施の形態】
図１から図５において、本発明の電子部品を説明すると、図１は本発明の電子機器の一部を分解して示す斜視図、図２は本発明の電子機器の要部の断面図、図３から図５は、本発明の電子機器に係わり、熱伝導部材のケースへの取付方法を示す説明図である。
これらの図において、プラスチック材料で成形されたケース１は、底壁部１ａと、四つの側壁部１ｂと、底壁部１ａに対向して上方が開放した開口部１ｃと、底壁部１ａに設けられた矩形の大きなきな貫通孔３と、ケーブルを引き出す貫通孔４とを有している。そして、ケース１の大きな貫通孔３の外周部には、爪部５と、突起部からなる係止部６が形成されており、爪部５は、底壁部１ａに垂直な側部５ａと、側部５ａ先端に設けられた抜け止め部５ｂとを有するＬ字型であり、突起部からなる係止部６は、底壁部１ａに垂直であり、大きな貫通孔３に向かい高さ寸法が減少する傾斜がある円柱で形成されている。爪部５は、大きな貫通孔３を挟んで対向するように配設されており、突起部からなる係止部６は、爪部５のそれぞれ間隔をおいた両側に設置されている。
さらに、ケース１は、底壁部１ａと同一面で、側壁部１ｂの外側に位置する角部に設けられた耳部７と、耳部７の中央に設けられた貫通孔７ａと、側壁部１ｂに設けられた内方に突出する凸部８と、凸部８の中央に設けられたネジ孔８ａと、ケース１の表面全面には、メッキ等の手段によって被着された金属膜９を有している。
【００１５】
金属板からなる矩形の熱伝導部材１０は、側縁部１０ａにおいて、外側に突出し、間隔をあけて配設された突出部１１と、突出部１１に、それぞれ形成された貫通孔からなる係止部１２と、突出部１１の間に挟まれた側縁部１０ａにおいて設けられ、内側に凹んだ凹部１３と、凹部１３の底辺から外側に突出した舌片部１４と、凹部１３の内側近傍に設けられた、凹部１３の幅とほぼ同等か幅広のスリット１５とを有し、突出部１１と、突出部１１に設けられた貫通孔からなる係止部１２、および、突出部１１の間に形成された凹部１３と舌片部１４は、熱伝導部材１０の対向する両辺に少なくとも一組ずつ配設されている。 さらに、熱伝導部材１０は、平板部１０ｂの数カ所において、一部を切り欠いて上方に切り起こされた舌片１６と、平板部１０ｂに設けられた複数の貫通孔１７とを有している。貫通孔１７には、熱伝導部材２の軽量化の目的がある。さらに、熱伝導部材１０は、ケース１の大きな貫通孔３に合致した形状で下方に突出した膨出部を有している。
【００１６】
図３から図５において、熱伝導部材１０のケース１への取付方法を説明する。
熱伝導部材１０は、舌片１６の切り起こされた方向を上方に向けて、ケース１の内部に収納される。そして、図３に示すように、熱伝導部材１０の凹部１３には、ケース１に形成された対向する爪部５がそれぞれ嵌入される。このとき、図４に示すように、熱伝導部材１０は、凹部１３の底辺から突出した舌辺部１４において、爪部５の抜け止め部５ｂにより掛け止めされた状態となり、また、突出部１１は、ケース１の突起部からなる係止部６の傾斜に乗り上げて、突出部１１に形成された貫通孔からなる係止部１２は、ケース１の突起部からなる係止部６に導かれる。そして、図５に示すように、熱伝導部材１０の舌片部１４における側縁部１０ａを、爪部５の側部５ａに圧接させた状態で、ケース１の突起部からなる係止部６を、熱伝導部材１０の貫通孔からなる係止部１２に係止して、熱伝導部材１０を、ケース１の大きな貫通孔３を塞ぐように取り付ける。
そして、熱伝導部材１０が取り付けられたとき、舌片部１４は抜け止め部５ｂに掛け止めされた状態で、側縁部１０ａが爪部５に圧接されると共に、この圧接によって、熱伝導部材１０の係止部１２がケース１の係止部６に圧接して、熱伝導部材１０とケース１とは、遊びなく結合された状態となる。
上記のように、熱伝導部材１０がケース１に取り付けられたとき、ケース１の大きな貫通孔３の形状に一致するようにして形成された熱伝導部材１０の平板部１０ｂの膨出部は、大きな貫通孔３から下方に露出して、ケース１の底壁部１ａと面一、あるいは、底壁部１ａから突出した構成となっている。
【００１７】
また、熱伝導性が良く、且つ弾性のあるシート３０は、例えばポリイミドフィルムの両面にアクリル系粘着材を塗布したもので、熱伝導部材１０の、ケース１の大きな貫通孔３から露出した表面に接着されて取り付けられている。
【００１８】
プリント基板１８は、貫通孔２２と、導電パターン（図示せず）とを有し、このプリント基板１８の下面１８ａには、ケーブルを接続するためのコネクタ１９及び、発熱量の大きな発熱部品２０等が設置され、また上面１８ｂには、比較的発熱量の少ない電子部品２１等が設置されている。
金属板から成る箱形の金属カバー２３は、下面が開放され、上面に複数個の貫通孔２４を有し、この金属カバー２３は、プリント基板１８の上面１８ｂの電子部品２１を覆うように取り付けられ、金属カバー２３により上面１８ｂに設置された電子部品２１が電気的にシールドされる構成となっている。
【００１９】
また、プリント基板１８は、発熱部品２０の設置された下面１８ａを、ケース１の底壁部１ａに対向させ、開口部１ｃを塞ぐようにケース１に載置され、そして、プリント基板１８の貫通孔２２に通したネジ２５を、ケース１の凸部８のネジ孔８ａにねじ込むことにより、ケース１に取り付けられている。
そして、プリント基板１８が、ケース１に取り付けられた状態では、熱伝導部材１０は、プリント基板１８の下面１８ａの発熱部品２１を含む領域に対向すると共に、プリント基板１８の下面１８ａに設けられた発熱部品２１の表面には、熱伝導部材１０の舌片１６が接触した状態となっている。
【００２０】
そして、プリント基板１８、及びシート３０が接着された熱伝導部材１０を取り付けられたケース１は、マザー基板２６の導電パターン２７が形成された表面に載置され、ケース１はマザー基板２６へ、ケース１の耳部７の貫通孔７ａに通したネジ２９を、マザー基板２６に設けられたネジ孔２８にねじ込みして、固定されている。
【００２１】
上記のような構成を有する電子機器は、その使用時において、発熱部品２０から発生した熱は、舌片１６を伝わり、熱伝導部材１０の全体へと拡散し、そして熱伝導部材１０に密着したシート３０を介して、シート３０に密着したマザー基板２６の導電パターン２７へと放熱されるようになっている。即ち、発熱部品２０からの熱は、熱伝導部材１０から速やかにシート３０、導電パターン２７を介してケース１の外部に放出され、ケース１の内部の温度上昇は抑えられるようになっている。
【００２２】
なお、前記実施例においては、ケース１の係止部６を突起部で説明したが、孔部とし、熱伝導部材１０の係止部１２を貫通孔で説明したが、凸部として、互いを係止させてもよい。
また、前記実施例においては、熱伝導部材１０の側縁部１０ａは、爪部５が嵌入される凹部１３を設けたが、凹部１３を設けることなく、爪部５を熱伝導部材１０の側縁部１０ａに圧接させてもよい。
【００２３】
【発明の効果】
本発明の電子機器においては、熱伝導部材１０の側縁部１０ａが、ケース１の爪部５の側部５ａに圧接させ、且つ、爪部５の抜け止め部５ｂに掛け止めされた状態で、爪部５の両側に間隔をおいて設けられた、ケース１の突起部からなる係止部６と、熱伝導部材１０の貫通孔からなる係止部１２とを互いに係止させたので、熱伝導部材１０のガタツキがなく、ガタツキ音のない、製品価値の高い電子機器が提供できる。また、従来のように舌片４２と発熱部品４６との摩擦による発熱部品４６の破損がなく、長寿命の電子機器を提供できる。
また、本発明の電子機器において、熱伝導部材１０の係止部１２を貫通孔とし、ケース１の係止部６を突起部としたので、熱伝導部材１０の係止部１２と、ケース１の係止部６とを互いに係止させる作業は容易であり、且つ、破損することがない。
また、本発明の電子機器では、熱伝導部材１０の側縁部１０ａにおいて、突出部１１を間隔をあけて配置し、突出部１１に熱伝導部材の係止部１２を設け、また、突出部１１の間に挟まれた側縁部１０ａにおいて、内側に凹んだ凹部１３を設け、凹部１３の底辺から外側に突出した舌片部１４を形成してたので、爪部５を凹部１３の位置に嵌入することで、熱伝導部材１０の係止部１２が、ケース１の係止部６に導かれるので、組立の位置合わせが容易となり、また、ケース１の熱伝導部材１０を取り付けるために要する面積を小さくすることができる。
また、スリット１５を設けることで、熱伝導部材１０が爪部５の側部５ａに圧接されたときの歪みはスリット１５で吸収され、熱伝導部材１０の撓みは抑えられて、マザー基板２６の導電パターン２７との密着性が保たれる。
【図面の簡単な説明】
【図１】本発明の電子機器の一部を分解して示す斜視図。
【図２】本発明の電子機器の要部の断面図。
【図３】本発明の電子機器に係わり、熱伝導部材のケースへの取付方法を示す説明図。
【図４】本発明の電子機器に係わり、熱伝導部材のケースへの取付方法を示す説明図。
【図５】本発明の電子機器に係わり、熱伝導部材のケースへの取付方法を示す説明図。
【図６】従来の電子機器の斜視図。
【図７】従来の電子機器の一部を分解して示す斜視図。
【図８】従来の電子機器の要部の断面図。
【符号の説明】
１ ケース
１ａ 底壁部
１ｂ 側壁部
１ｃ 開口部
３ 大きな貫通孔
４ ケーブルを引き出すための貫通孔
５ 爪部
５ａ 側部
５ｂ 掛け止め部
６ 係止部
７ 耳部
７ａ 貫通孔
８ 凸部
８ａ ネジ孔
９ 金属膜
１０ 熱伝導部材
１０ａ 側縁部
１０ｂ 平板部
１１ 突出部
１２ 係止部
１３ 凹部
１４ 舌片部
１５ スリット
１６ 舌片
１７ 貫通孔
１８ プリント基板
１８ａ 下面
１８ｂ 上面
１９ コネクタ
２０ 発熱部品
２１ 電子部品
２２ 貫通孔
２３ 金属カバー
２４ 貫通孔
２５ ネジ
２６ マザー基板
２７ 導電パターン
２８ ネジ孔
２９ ネジ
３０ シート[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic device such as a transmission / reception unit used for a mobile phone.
[0002]
[Prior art]
FIG. 6 is a perspective view of a conventional electronic device, FIG. 7 is an exploded perspective view showing a part of the conventional electronic device, and FIG. 8 is a conventional electronic device. It is principal part sectional drawing of.
In these figures, a case 41 formed of a plastic material includes a bottom wall portion 41a, four side wall portions 41b, an opening portion 41c which is open to the upper side facing the bottom wall portion 41a, and a bottom wall portion 41a. A large through hole 41d provided, a through hole 41e for drawing out a cable, and an L-shaped claw portion 41f provided at several positions on the outer peripheral portion of the large through hole 41d and having a concave portion toward the large through hole 41d. A lug 41g provided at a corner located outside the side wall 41b on the same plane as the bottom wall 41a, a through hole 41h provided at the center of the lug 41g, and a side wall 41b. The case 41 has a convex portion 41k protruding inward, a screw hole 41m provided at the center of the convex portion 41k, and a metal film 41n applied to the entire surface of the case 41 by plating or the like.
[0003]
The rectangular heat conducting member 42 made of a metal plate includes a flat plate portion 42 a, a tongue piece 42 d which is partially cut out and raised at several places of the flat plate portion 42 a, and a plurality of And the through hole 43.
[0004]
The heat conductive member 42 is housed inside the case 41 with the cut-and-raised direction of the tongue piece 42d facing upward, and hooks the outer peripheral portion of the flat plate portion 42 in the concave portion of the L-shaped claw portion 41f. The large through hole 41d of the case 41 is closed by the flat plate portion 42a.
At this time, between the claw portion 41f of the case 41 and the heat conducting member 42, there is a vertical play between the height of the concave portion of the claw portion 41f and the thickness of the heat conducting member 42, and the large through hole 41d There is a play in the lateral direction between the distance between the claw portions 41f opposed to each other and the width of the heat conductive plate 42. Therefore, the heat conductive member 42 Rattling occurs in the vertical and horizontal directions.
[0005]
The printed circuit board 44 has a through hole 48 and a conductive pattern (not shown). On the lower surface 44a of the printed circuit board 44, a connector 45 for connecting a cable, a heat-generating component 46 having a large amount of heat, and the like are provided. Are mounted on the upper surface 44b, and an electronic component 47 having a relatively small amount of heat generation is provided.
A box-shaped metal cover 49 made of a metal plate has an open lower surface and a plurality of through holes 50 on the upper surface. The metal cover 49 is attached to the printed circuit board 44 so as to cover the electronic components 47 on the upper surface 44b. The electronic component 47 provided on the upper surface 44b is electrically shielded by the metal cover 49.
[0006]
The printed circuit board 44 is placed on the case 41 so that the lower surface 44a on which the heat-generating component 46 is installed is opposed to the bottom wall 41a of the case 41 so as to cover the opening 41c. The screw 51 passed through the hole 48 is attached to the case 41 by screwing it into the screw hole 41m of the convex portion 41k of the case 41.
When the printed board 44 is attached to the case 41, the heat conducting member 42 is provided on the lower face 44 a of the printed board 44 while facing the region including the heat-generating component 46 on the lower face 44 a of the printed board 44. The tongue piece 42d of the heat conducting member 42 is in contact with the surface of the heat generating component 46.
[0007]
Then, the case 41 to which the printed board 44 and the heat conducting member 42 are attached is placed on the surface of the mother board 52 on which the conductive pattern 52a is formed. The case 41 is attached to the mother board 52 by the ear 41g of the case 41. The screw 53 passed through the through hole 41h is screwed into a screw hole 52b provided in the mother board 52 and fixed.
[0008]
In the electronic device having the above-described configuration, at the time of its use, heat generated from the heat-generating component 46 is transmitted through the tongue piece 42d in contact with the surface of the heat-generating component 46, and diffuses to the entire heat conductive member 42, Then, heat is radiated from the heat conducting member 42.
[0009]
[Problems to be solved by the invention]
However, in the conventional electronic device, since the heat conducting member 42 is hung and attached to the L-shaped claw portion 41f of the case 41, rattling occurs between the claw portion 41f and the heat conducting member 42. For this reason, there is a problem that rattling noise of the heat conducting member 42 is generated by vibration, impact, or the like during use of the electronic device. Further, when the heat conducting member 42 is loose, there is a problem that the heat generating component 46 is damaged by friction between the tongue piece 42d and the surface of the heat generating component 46.
[0010]
[Means for Solving the Problems]
As a first means for solving the above problems, a printed circuit board, a heat-generating component installed on the printed circuit board, a case made of a resin for attaching the printed circuit board and housing the heat-generating component, And a heat conducting member made of a metal plate connected to the heat-generating component. The case has an L-shaped claw having a retaining portion at a tip, and a gap on both sides of the claw. And a locking portion formed of a projection or a hole provided at a predetermined position. The heat conductive member has a locking portion formed of a through hole or a convex portion, and the heat conductive member has a side edge. The part is pressed against the side part of the claw part, and in a state where a part of the heat conductive member is hung on the retaining part of the claw part, the locking part of the case and the heat conductive member The locking portion was configured to be locked to each other.
[0011]
Further, as a second solution, the locking portion formed on the heat conductive member is configured by a through hole, and the locking portion formed on the case is configured by a projection, and the projection is It was configured to penetrate and penetrate the through hole.
[0012]
As a third solution, a protrusion protruding outward is provided at the side edge of the heat conductive member at an interval, and the locking of the heat conductive member is provided on the protrusion. A portion, and a concave portion recessed inward is formed in the side edge portion of the heat conductive member between the projecting portions, and a tongue piece portion projecting outward from the bottom side is formed in the concave portion, In a state where the claw portion is fitted in the concave portion, the side edge portion of the heat conducting member is pressed against the side portion of the claw portion at the tongue piece portion, and the tongue piece portion of the heat conducting member is It is configured to be hooked on the retaining portion of the claw portion.
[0013]
As a fourth solution, the heat conducting member is provided with a slit having a width equal to or greater than the width of the claw portion near the side edge portion facing the claw portion.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 5, an electronic component of the present invention will be described. FIG. 1 is an exploded perspective view showing a part of the electronic device of the present invention, FIG. 2 is a cross-sectional view of a main part of the electronic device of the present invention, 3 to 5 are explanatory views showing a method of attaching a heat conducting member to a case according to the electronic apparatus of the present invention.
In these figures, a case 1 molded of a plastic material includes a bottom wall 1a, four side walls 1b, an opening 1c facing the bottom wall 1a and opening upward, and a bottom wall 1a. It has a large rectangular through hole 3 and a through hole 4 for drawing out a cable. On the outer periphery of the large through-hole 3 of the case 1, a claw 5 and a locking portion 6 composed of a protrusion are formed, and the claw 5 is connected to a side 5a perpendicular to the bottom wall 1a. L-shaped portion having a retaining portion 5b provided at the tip of the side portion 5a. The locking portion 6 formed of a projection is perpendicular to the bottom wall portion 1a and has a height dimension toward the large through hole 3. Is formed of a cylinder having a slope that decreases. The claw portions 5 are disposed so as to face each other with the large through hole 3 interposed therebetween, and the locking portions 6 formed of protrusions are provided on both sides of the claw portion 5 at intervals.
Further, the case 1 has a lug 7 provided at a corner located outside the side wall 1b on the same plane as the bottom wall 1a, a through hole 7a provided at the center of the lug 7, and a side wall. 1b, a projecting portion 8 protruding inward, a screw hole 8a provided at the center of the projecting portion 8, and a metal film 9 applied by means such as plating over the entire surface of the case 1. Have.
[0015]
A rectangular heat conducting member 10 made of a metal plate protrudes outward at a side edge portion 10a, and is formed by a protrusion 11 disposed at an interval and a through hole formed in the protrusion 11. A concave portion 13 which is provided at a side edge portion 10a sandwiched between the portion 12 and the protruding portion 11 and which is depressed inward, a tongue piece portion 14 which protrudes outward from the bottom of the concave portion 13, and A slit 15 having a width substantially equal to or wider than the width of the concave portion 13 is provided, and the protrusion 11 and the locking portion 12 formed of a through hole provided in the protrusion 11 are provided between the protrusion 11. The formed concave portion 13 and the tongue piece portion 14 are provided on at least one pair on both sides of the heat conductive member 10 facing each other. Further, the heat conducting member 10 has a tongue piece 16 cut out and raised upward at a portion of the flat plate portion 10b, and a plurality of through holes 17 provided in the flat plate portion 10b. . The through hole 17 has the purpose of reducing the weight of the heat conducting member 2. Further, the heat conducting member 10 has a bulging portion projecting downward in a shape matching the large through hole 3 of the case 1.
[0016]
3 to 5, a method of attaching the heat conductive member 10 to the case 1 will be described.
The heat-conducting member 10 is housed inside the case 1 with the tongue piece 16 cut and raised upward. Then, as shown in FIG. 3, the opposing claw portions 5 formed on the case 1 are fitted into the concave portions 13 of the heat conductive member 10, respectively. At this time, as shown in FIG. 4, the heat conductive member 10 is in a state of being hooked by the retaining portion 5 b of the claw portion 5 at the tongue portion 14 protruding from the bottom of the concave portion 13, and Moves on the inclination of the locking portion 6 formed of the projecting portion of the case 1, and the locking portion 12 formed of the through hole formed in the projecting portion 11 is guided to the locking portion 6 formed of the projecting portion of the case 1. . Then, as shown in FIG. 5, in a state where the side edge 10 a of the tongue piece 14 of the heat conducting member 10 is pressed against the side 5 a of the claw 5, the locking portion 6 formed of the projection of the case 1 is pressed. Is fixed to a locking portion 12 formed of a through hole of the heat conductive member 10, and the heat conductive member 10 is attached so as to close the large through hole 3 of the case 1.
When the heat conducting member 10 is attached, the side edge portion 10a is pressed against the claw portion 5 in a state where the tongue piece portion 14 is hooked on the retaining portion 5b, and the heat contact member The engaging portions 12 of the case 10 are pressed against the engaging portions 6 of the case 1, and the heat conductive member 10 and the case 1 are connected without play.
As described above, when the heat conductive member 10 is attached to the case 1, the bulging portion of the flat plate portion 10 b of the heat conductive member 10 formed to match the shape of the large through hole 3 of the case 1 is: The case 1 is exposed downward from the large through hole 3 and is flush with the bottom wall 1a of the case 1 or protrudes from the bottom wall 1a.
[0017]
Further, the sheet 30 having good heat conductivity and elasticity is obtained by applying an acrylic adhesive on both sides of, for example, a polyimide film, and is provided on the surface of the heat conductive member 10 exposed from the large through hole 3 of the case 1. Glued and attached.
[0018]
The printed circuit board 18 has a through hole 22 and a conductive pattern (not shown). On a lower surface 18a of the printed circuit board 18, a connector 19 for connecting a cable, a heat-generating component 20 having a large heat value, and the like are provided. Are provided, and on the upper surface 18b, an electronic component 21 having a relatively small amount of heat generation is provided.
A box-shaped metal cover 23 made of a metal plate has an open lower surface and a plurality of through holes 24 on the upper surface. The metal cover 23 is attached so as to cover the electronic components 21 on the upper surface 18 b of the printed circuit board 18. The electronic component 21 provided on the upper surface 18b is electrically shielded by the metal cover 23.
[0019]
The printed circuit board 18 is placed on the case 1 so that the lower surface 18a on which the heat-generating components 20 are installed faces the bottom wall 1a of the case 1 and closes the opening 1c. The screw 25 passed through the hole 22 is attached to the case 1 by screwing it into the screw hole 8 a of the projection 8 of the case 1.
When the printed board 18 is attached to the case 1, the heat conducting member 10 is provided on the lower face 18 a of the printed board 18 while facing the area including the heat-generating component 21 on the lower face 18 a of the printed board 18. The tongue 16 of the heat conducting member 10 is in contact with the surface of the heat generating component 21.
[0020]
Then, the case 1 to which the heat conductive member 10 to which the printed circuit board 18 and the sheet 30 are adhered is attached is placed on the surface of the mother substrate 26 on which the conductive pattern 27 is formed. A screw 29 passed through the through hole 7 a of the ear 7 of the case 1 is screwed into a screw hole 28 provided in the mother board 26 and fixed.
[0021]
In the electronic device having the above-described configuration, at the time of use, heat generated from the heat-generating component 20 is transmitted through the tongue piece 16, diffuses to the entire heat conductive member 10, and adheres to the heat conductive member 10. Heat is radiated through the sheet 30 to the conductive pattern 27 of the mother substrate 26 which is in close contact with the sheet 30. That is, heat from the heat-generating component 20 is quickly released from the heat conductive member 10 to the outside of the case 1 via the sheet 30 and the conductive pattern 27, so that a rise in the temperature inside the case 1 is suppressed.
[0022]
In the above-described embodiment, the locking portion 6 of the case 1 has been described as a protrusion, but the hole has been described, and the locking portion 12 of the heat conductive member 10 has been described as a through-hole. It may be locked.
In the above-described embodiment, the side edge 10a of the heat conducting member 10 is provided with the concave portion 13 into which the claw portion 5 is fitted. It may be pressed against the edge 10a.
[0023]
【The invention's effect】
In the electronic device of the present invention, the side edge 10 a of the heat conductive member 10 is pressed against the side 5 a of the claw 5 of the case 1 and is hooked on the retaining portion 5 b of the claw 5. Since the locking portion 6 formed of the projecting portion of the case 1 and the locking portion 12 formed of the through-hole of the heat conducting member 10 are provided on both sides of the claw portion 5 at intervals, the locking portion 12 is locked to each other. It is possible to provide an electronic device with high product value without rattling of the heat conducting member 10 and without rattling noise. Further, unlike the related art, there is no breakage of the heat generating component 46 due to friction between the tongue piece 42 and the heat generating component 46, and it is possible to provide a long-life electronic device.
Further, in the electronic device of the present invention, the locking portion 12 of the heat conductive member 10 is formed as a through hole, and the locking portion 6 of the case 1 is formed as a projection. The operation of locking the locking portions 6 with each other is easy, and there is no breakage.
Further, in the electronic device of the present invention, the protrusions 11 are arranged at intervals on the side edge 10 a of the heat conductive member 10, and the protrusions 11 are provided with the locking portions 12 of the heat conductive member. In the side edge portion 10a sandwiched between the concave portions 11, the concave portion 13 concaved inward is provided, and the tongue piece portion 14 projecting outward from the bottom of the concave portion 13 is formed. Since the engaging portion 12 of the heat conducting member 10 is guided to the engaging portion 6 of the case 1 by fitting into the groove, the alignment of the assembly is facilitated, and in order to attach the heat conducting member 10 of the case 1, The required area can be reduced.
In addition, by providing the slit 15, the distortion when the heat conductive member 10 is pressed against the side portion 5 a of the claw portion 5 is absorbed by the slit 15, the bending of the heat conductive member 10 is suppressed, and the Adhesion with the conductive pattern 27 is maintained.
[Brief description of the drawings]
FIG. 1 is an exemplary exploded perspective view showing an electronic device according to the present invention;
FIG. 2 is a cross-sectional view of a main part of the electronic device of the invention.
FIG. 3 is an explanatory view showing a method of attaching a heat conducting member to a case according to the electronic apparatus of the present invention.
FIG. 4 is an explanatory view showing a method of attaching a heat conducting member to a case according to the electronic apparatus of the present invention.
FIG. 5 is an explanatory view showing a method of attaching a heat conducting member to a case according to the electronic apparatus of the present invention.
FIG. 6 is a perspective view of a conventional electronic device.
FIG. 7 is an exploded perspective view showing a part of a conventional electronic device.
FIG. 8 is a cross-sectional view of a main part of a conventional electronic device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 1a Bottom wall part 1b Side wall part 1c Opening part 3 Large through hole 4 Through hole 5 for pulling out cable 5 Claw part 5a Side part 5b Latch part 6 Lock part 7 Ear part 7a Through hole 8 Convex part 8a Screw hole Reference Signs List 9 metal film 10 heat conductive member 10a side edge 10b flat plate 11 projecting portion 12 locking portion 13 concave portion 14 tongue piece 15 slit 16 tongue piece 17 through hole 18 printed circuit board 18a bottom surface 18b top surface 19 connector 20 heat generating component 21 electronic component 22 through hole 23 metal cover 24 through hole 25 screw 26 mother board 27 conductive pattern 28 screw hole 29 screw 30 sheet
