Electrostatic discharge proof keypad

Details Electrostatic discharge proof keypad Electrostatic discharge proof keypad

1987-08-05

1989-02-28

Scott, J. R.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

200 5A, 361220, H01H 902, H01H 1370, H05F 302

Patent

active

048091260

ABSTRACT:
A keypad which prevents electrostatic discharge from occurring in electronic equipment such as printers, computers and the like. The keypad includes a switch mechanism positioned on the circuit board associated with the electronic equipment. Attached to the switch mechanism is an actuating lengthening member of sufficient length to isolate the switch mechanism from electrostatic discharge through the keypad. A light source is also positioned under the keypad and the light source has attached thereto a light conducting lengthening member of sufficient length to isolate the light source from electrostatic discharge through the keypad. A method of preventing electrostatic discharge through a keypad to a circuit board is also disclosed.

REFERENCES:
patent: 4040120 (1977-08-01), Geadah et al.
patent: 4303960 (1981-12-01), Sherwood et al.
patent: 4376879 (1983-03-01), Nagata et al.
patent: 4439646 (1984-03-01), Bouvrande
patent: 4449024 (1984-05-01), Stracener
patent: 4456800 (1984-06-01), Holland
patent: 4481556 (1984-11-01), Berke et al.
patent: 4482064 (1984-11-01), Berke et al.
patent: 4586106 (1986-04-01), Frazier

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