发明授权
- 专利标题： Entry board for drilling small holes, a method of making the same and a method for drilling small holes through a printed circuit board by using said entry board
- 专利标题（中）： 用于钻孔的入口板，其制造方法以及通过使用所述入口板通过印刷电路板钻小孔的方法
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申请号： US09295873申请日： 1999-04-21
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公开(公告)号： US06214135B1公开(公告)日： 2001-04-10
- 发明人: Yasushi Washio , Koji Miyano , Akio Fukuda
- 申请人： Yasushi Washio , Koji Miyano , Akio Fukuda
- 优先权： JP8-46668 19960208; JP9-13970 19970128
- 主分类号： B23K2004
- IPC分类号： B23K2004
摘要：
An entry board for drilling small holes having a front surface layer made of aluminum or aluminum alloy to be disposed at the drilling inlet side and a back surface layer made of aluminum or aluminum alloy to be disposed at the drilling outlet side. The back surface layer is adhered or joined by clad rolling to said front surface layer. The hardness of the front surface layer is smaller than that of the back surface layer.
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