Patent
Memory card having static electricity protection
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TLDR
In this article, a memory card includes a card support formed by two plastic boards; a printed circuit board mounted on the card support; an integrated circuit mounted on a printed-circuit board and including a memory for storing information, and access terminals connected to the memory and central processing unit for accessing the information from the memory.Abstract:
A memory card includes a card support formed by two plastic boards; a printed circuit board mounted on the card support; an integrated circuit mounted on the printed circuit board and including a memory for storing information, a central processing unit for accessing the information, and access terminals connected to the memory and central processing unit for accessing the information from the memory; a plurality of connection terminals provided on an exposed surface of the printed circuit board; a common ground discharge pattern provided on the exposed surface of the printed circuit board and separated from the connection terminals by first discharge gaps; a plurality of lead terminals provided on a non-exposed surface of the printed circuit board and connected between respective ones of the connection terminals and respective ones of the access terminals of the integrated circuit; a second discharge pattern formed on the non-exposed surface and separated from the lead terminals by second discharge gaps such that undesirable static electricity supplied to the connection terminals on the exposed surface is discharged to the respective discharge patterns through the first and second discharge gaps.read more
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Patent
Circuit board formed with spark gap
Ueta Yasuomi,Tatsuro Toyama +1 more
TL;DR: In this paper, a circuit board formed with a spark gap for protecting a circuit element such as a transistor connected to a picture tube of a television receiver when spark discharge occurring within the picture tube produces a current under a high voltage tending to destroy the transistor.