Protection of electronic circuits
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United States of America Patent
Stats
-
Mar 9, 1993
Grant Date -
N/A
app pub date -
Oct 30, 1989
filing date -
Nov 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Protection of electronic circuits from static electrical discharge is provided by utilizing a key mat, having key buttons moulded therein, of a key board for the circuits to provide an electrically insulating barrier to such discharges. The electronic circuits are housed in a housing having apertures through which the key buttons extend. Electrical discharge from a key button through the aperture in the housing to the circuits is prevented by forming the mat to have an extent sufficient to ensure that any discharge track is longer than that for a predetermined potential. Where the direct distance to a circuit is short the mat is formed so as to ensure a discharge track greater than the direct distance and of sufficient length. For this purpose the mat may be formed with an upstanding wall. A housing may have a cooperating wall to lengthen the air path.
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