JP5195095B2 - 電子装置 - Google Patents
電子装置 Download PDFInfo
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- JP5195095B2 JP5195095B2 JP2008175341A JP2008175341A JP5195095B2 JP 5195095 B2 JP5195095 B2 JP 5195095B2 JP 2008175341 A JP2008175341 A JP 2008175341A JP 2008175341 A JP2008175341 A JP 2008175341A JP 5195095 B2 JP5195095 B2 JP 5195095B2
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- circuit board
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Description
図1は、本発明の第1実施形態に係る電子装置の概略断面図であり、(a)は全体断面図、(b)は(a)中の丸で囲んだA部、すなわちワイヤ40におけるパッド41側の接続部41の近傍部の拡大図である。
図3は、本発明の第2実施形態に係る電子装置の要部すなわちワイヤ40におけるパッド41側の接続部41の近傍部の概略断面構成を示す図である。本実施形態では、上記第1実施形態との相違点を中心に述べることとする。
図4は、本発明の第3実施形態に係る電子装置の要部すなわちワイヤ40におけるパッド23側の接続部41の近傍部の概略断面構成を示す図である。上記第1実施形態との相違点を中心に述べることとする。
図9は、本発明の第4実施形態に係る電子装置の要部すなわちワイヤ40におけるパッド23側の接続部41の近傍部の概略断面構成を示す図である。
21 回路基板の一面
23 パッド
24 凹部
30 端子
40 ボンディングワイヤ
41 ボンディングワイヤにおけるパッド側の接続部
42 ボンディングの頂部
43 折り返し部
50 モールド樹脂
60 密着補助膜
Claims (3)
- 一面(21)上にパッド(23)を有する回路基板(20)と、
前記回路基板(20)の周囲に配置された端子(30)と、
前記回路基板(20)の前記一面(21)上にて前記パッド(23)と前記端子(30)とを接続するボンディングワイヤ(40)と、
前記回路基板(20)の前記一面(21)上にて、当該一面(21)、前記ボンディングワイヤ(40)、および、前記端子(30)を封止するモールド樹脂(50)とを備える電子装置において、
前記ボンディングワイヤ(40)における前記パッド(23)側の接続部(41)と前記端子(30)側の接続部との間の部位が、前記回路基板(20)の前記一面(21)の上方に向かって凸となったループ形状をなしており、
前記回路基板(20)の前記一面(21)上には、前記回路基板(20)と前記モールド樹脂(50)との間に介在し当該両部材(20、50)を密着させるための密着補助膜(60)が設けられており、
前記ボンディングワイヤ(40)のうち前記パッド側の接続部(41)から頂部(42)まで延びる部位と、前記回路基板(20)の前記一面(21)との間には、前記ボンディングワイヤ(40)側から前記回路基板(20)側に向かって拡がるフィレット形状をなす前記密着補助膜(60)が、前記ボンディングワイヤ(40)および前記回路基板(20)の前記一面(21)に接した状態で当該間を埋めるように介在しており、
前記回路基板(20)の前記一面(21)上にて前記ボンディングワイヤ(40)の下に位置する前記密着補助膜(60)は、その厚さが0.2mm以下であり、且つ、その軟化点が150℃以上であることを特徴とする電子装置。 - 前記ボンディングワイヤ(40)のうち前記回路基板(20)の前記一面(21)上にて前記パッド側の接続部(41)から頂部(42)まで延びる部位には、前記回路基板(20)の前記一面(21)に向かって凸となるようにU字形状に折り返された折り返し部(43)が設けられていることを特徴とする請求項1に記載の電子装置。
- 前記回路基板(20)の前記一面(21)のうち前記パッド(23)の周囲には、当該一面(21)より凹んだ凹部(24)が設けられ、この凹部(24)に前記密着保護膜(60)が入り込んでいることを特徴とする請求項1または2に記載の電子装置。
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