Protection of electronic circuits

Details Protection of electronic circuits Protection of electronic circuits

1989-10-30

1993-03-09

Pellinen, A. D.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

364708, H05K 900

Patent

active

051930471

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.

REFERENCES:
patent: 4336529 (1982-06-01), Buan
patent: 4494651 (1985-01-01), Malcolm
patent: 4540865 (1985-09-01), Calder
patent: 4764770 (1988-08-01), Church
patent: 4809126 (1989-02-01), Burkman et al.
patent: 4814566 (1989-03-01), Sigl
patent: 4818829 (1989-04-01), Nopper et al.

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