JP5003347B2 - 電子装置およびその製造方法 - Google Patents
電子装置およびその製造方法 Download PDFInfo
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- JP5003347B2 JP5003347B2 JP2007216148A JP2007216148A JP5003347B2 JP 5003347 B2 JP5003347 B2 JP 5003347B2 JP 2007216148 A JP2007216148 A JP 2007216148A JP 2007216148 A JP2007216148 A JP 2007216148A JP 5003347 B2 JP5003347 B2 JP 5003347B2
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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100の概略断面構成を示す図である。また、図2は、この電子装置100における要部の拡大図であり、(a)は金ワイヤ用ランド12の概略平面図、(b)は金ワイヤ用ランド12の概略断面図である。
図7は、本発明の第2実施形態に係る電子装置の要部を示す図であり、(a)は金ワイヤ用ランド12の概略平面図、(b)は(a)に示される金ワイヤ用ランド12の概略断面図である。
図8は、本発明の第3実施形態に係る電子装置の製造方法における金ワイヤ用ランド12の形成工程の要部を示す工程図である。本実施形態の製造方法は、上記した第1および第2実施形態に適用可能である。
図9は、本発明の第4実施形態に係る電子装置の製造方法における金ワイヤ用ランド12の形成工程の要部を示す工程図である。本実施形態の製造方法も、上記した第1および第2実施形態に適用可能である。
なお、ランドの形成工程では、アルミワイヤ用ランド11および金ワイヤ用ランド12の導体部10aを形成するとともに、金ワイヤ用ランド12における導体部10aについては、複数個の分割部12aに分割されたものとして形成したが、この分割部12aは、レーザーで分割するものでなくてもよい。たとえば、マスク印刷などの手法によって、予め分割されたメタライズ層10aを形成してもよい。
11…アルミワイヤ用ランド、12…金ワイヤ用ランド、12a…分割部、
21…電子部品としての第1のICチップ、
22…電子部品としての第2のICチップ、31…アルミワイヤ、32…金ワイヤ、
40…メッキ阻害材料。
Claims (5)
- 表面が金メッキ(10c)よりなるワイヤボンディング用の複数のランド(11、12)を有する基板(10)と、
前記基板(10)に搭載された電子部品(21、22)と、
前記電子部品(21、22)と前記ランド(11、12)とを結線するボンディングワイヤ(31、32)とを備え、
前記ボンディングワイヤは、アルミニウムよりなるアルミワイヤ(31)と金よりなる金ワイヤ(32)との異なる材質の2種類のものが混在し、
前記複数のランドは、前記アルミワイヤ(31)と接続されるアルミワイヤ用ランド(11)と前記金ワイヤ(32)と接続される金ワイヤ用ランド(12)とにより構成されている電子装置において、
1個の前記金ワイヤ用ランド(12)は、複数個の領域に分割された分割部(12a)の集合体であってこれら複数個の前記分割部(12a)にまたがって1本の前記金ワイヤ(32)が接続されているものであり、
個々の前記分割部(12a)の面積が、1個の前記アルミワイヤ用ランド(11)の面積よりも小さいものであり、
個々の前記分割部(12a)における前記金メッキ(10c)は、前記アルミワイヤ用ランド(11)における前記金メッキ(10c)よりも厚いものであることを特徴とする電子装置。 - 基板(10)上に導体部(10a)を形成し、当該導体部(10a)の表面に金メッキ(10c)を施すことにより、表面が金メッキ(10c)よりなるワイヤボンディング用の複数のランド(11、12)を形成する工程と、
次に、前記基板(10)に電子部品(21、22)を搭載し、前記電子部品(21、22)と前記複数のランド(11、12)とを、アルミニウムよりなるアルミワイヤ(31)および金よりなる金ワイヤ(32)の異なる材質の2種類のものよりなるボンディングワイヤにより接続する工程とを備え、
前記ボンディングワイヤ(31、32)の接続は、前記アルミワイヤ(31)を前記複数のランド(11、12)のうちのアルミワイヤ用ランド(11)に接続した後、前記金ワイヤ(32)を前記複数のランド(11、12)のうちの金ワイヤ用ランド(12)に接続するものである電子装置の製造方法において、
前記ランド(11、12)の形成工程では、前記アルミワイヤ用ランド(11)および前記金ワイヤ用ランド(12)の前記導体部(10a)を形成するとともに、前記金ワイヤ用ランド(12)における前記導体部(10a)については、個々の部分が1個の前記アルミワイヤ用ランド(11)の面積よりも小さい複数個の分割部(12a)に分割されたものとして形成し、
続いて、前記複数個の分割部(12a)の表面、および、前記アルミワイヤ用ランド(11)における前記導体部(10a)の表面に、前記金メッキ(10c)を形成することにより、個々の前記分割部(12a)における前記金メッキ(10c)を前記アルミワイヤ用ランド(11)における前記金メッキ(10c)よりも厚くした前記複数のランド(11、12)を形成し、
しかる後、前記基板(10)への前記電子部品(21、22)の搭載、および、前記ボンディングワイヤ(31、32)による接続を行うことを特徴とする電子装置の製造方法。 - 基板(10)上に導体部(10a)を形成し、当該導体部(10a)の表面に金メッキ(10c)を施すことにより、表面が金メッキ(10c)よりなるワイヤボンディング用の複数のランド(11、12)を形成する工程と、
次に、前記基板(10)に電子部品(21、22)を搭載し、前記電子部品(21、22)と前記複数のランド(11、12)とを、アルミニウムよりなるアルミワイヤ(31)および金よりなる金ワイヤ(32)の異なる材質の2種類のものよりなるボンディングワイヤにより接続する工程とを備え、
前記ボンディングワイヤ(31、32)の接続は、前記アルミワイヤ(31)を前記複数のランド(11、12)のうちのアルミワイヤ用ランド(11)に接続した後、前記金ワイヤ(32)を前記複数のランド(11、12)のうちの金ワイヤ用ランド(12)に接続するものである電子装置の製造方法において、
前記ランド(11、12)の形成工程では、前記アルミワイヤ用ランド(11)および前記金ワイヤ用ランド(12)の前記導体部(10a)を形成し、
次に、前記金ワイヤ用ランド(12)における前記導体部(10a)を、レーザーで切断することにより、個々の部分が1個の前記アルミワイヤ用ランド(11)の面積よりも小さい複数個の分割部(12a)に分割されたものとし、
続いて、前記複数個の分割部(12a)の表面、および、前記アルミワイヤ用ランド(11)における前記導体部(10a)の表面に、前記金メッキ(10c)を形成することにより、個々の前記分割部(12a)における前記金メッキ(10c)を前記アルミワイヤ用ランド(11)における前記金メッキ(10c)よりも厚くした前記複数のランド(11、12)を形成し、
しかる後、前記基板(10)への前記電子部品(21、22)の搭載、および、前記ボンディングワイヤ(31、32)による接続を行うことを特徴とする電子装置の製造方法。 - 前記金メッキ(10c)の形成を行った後且つ前記ボンディングワイヤ(31、32)による接続を行う前に、
個々の前記分割部(12a)の表面のうち当該個々の分割部(12a)の端部に位置する部位にて、前記金メッキ(10c)をプレスすることにより、前記分割部(12a)における前記金メッキ(10c)を平坦化することを特徴とする請求項2または3に記載の電子装置の製造方法。 - 前記複数個の分割部(12a)を形成した後に、
個々の前記分割部(12a)の表面のうち当該個々の分割部(12a)の端部に位置する部位に、前記金メッキ(10c)の成長を阻害する材料(40)を配置し、その後、前記金メッキ(10c)の形成を行うことを特徴とする請求項2または3に記載の電子装置の製造方法。
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