Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge – Specific conduction means or dissipator
Patent
1992-07-29
1994-08-02
Young, Brian K.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
Specific conduction means or dissipator
174 5SG, 200305, 361212, H05F 304
Patent
active
053351371
ABSTRACT:
A computer keyboard according to a preferred construction has multiple non-conductive keys and at least one conductive key mounted in a keyboard housing. The conductive key includes a molded plastic key body having conductive material embedded therein. Conductive plugs are electrically coupled and mounted to the conductive key body. An electrostatic discharge pad is provided on a switch assembly positioned beneath the keys of the keyboard. The discharge pad is coupled to ground through a path resistor. When the conductive key body is depressed to an activated position, the plugs engage the electrostatic discharge pads so that electrostatic charges of the user progressively dissipate to ground through the key body, plug, discharge pad, and path resistor. At least one of the path resistor or the plug has a resistance greater than the resistance of the conductive key body. In this manner, electrostatic charge is routinely dissipated from a computer user while insuring that the user is not shocked when he/she initially touches and operates the conductive key.
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Batson Nathan
English George P.
Elms Richard T.
Key Tronic Corporation
Young Brian K.
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