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    • 7. 发明授权
    • Printed wiring board and electronic device using same
    • 印刷电路板和使用其的电子设备
    • US5973931A
    • 1999-10-26
    • US201203
    • 1998-11-30
    • Hiroyuki Fukasawa
    • Hiroyuki Fukasawa
    • H01L23/498H05K1/02H05K3/34H05K1/18
    • H05K3/3452H01L23/49838H05K3/3436H01L2224/45144H01L2224/48227H01L24/45H01L24/48H01L2924/00014H01L2924/01079H01L2924/12041H01L2924/15311H01L2924/181H05K1/0201H05K2201/062H05K2201/0989H05K2201/10734H05K2201/10969Y02P70/613
    • A printed wiring board and an electronic device using the same with which the formation of cracks in base portions of projecting external electrodes formed on lands on the printed wiring board is certainly prevented. With respect to a printed wiring board 11 having lands 16 formed in a wiring pattern where external electrodes 13 are to be formed and a pattern-protecting film 17 having openings 17a where the external electrodes 13 are to be formed, the opening diameter D1 of the openings 17a in the pattern-protecting film 17 is set greater by a predetermined dimension than the external diameter D2 of the lands 16 and a gap is thereby provided between each of the external electrodes 13 and the pattern-protecting film 17 so that the external electrodes 13 and the pattern-protecting film 17 do not make contact with each other and as a result there is no cracking of the external electrodes 13 caused by differential thermal expansion of the external electrodes 13 and the pattern-protecting film 17. An electronic module comprising the electronic device of the invention mounted on a mother board can be widely used by being incorporated into various types of electronic equipment.
    • 确实地防止了印刷线路板和使用该印刷线路板的电子装置,其中形成在印刷线路板上的凸台上的突出的外部电极的基部形成裂缝。 对于具有形成在要形成外部电极13的布线图案中的焊盘16和具有要形成外部电极13的开口17a的图案保护膜17的印刷布线板11, 图形保护膜17中的开口17a被设定为比焊盘16的外径D2更大的预定尺寸,并且由此在每个外部电极13和图案保护膜17之间设置间隙,使得外部电极 13和图案保护膜17彼此不接触,结果不会由外部电极13和图案保护膜17的热膨胀差导致外部电极13的开裂。一种电子模块,包括 安装在母板上的本发明的电子装置可以被并入各种类型的电子设备中而广泛使用。