Electrostatic protection for a telecommunications terminal appar

Details Electrostatic protection for a telecommunications terminal appar Electrostatic protection for a telecommunications terminal appar

1976-06-29

1977-08-02

Goldberg, Gerald

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

Specific conduction means or dissipator

179100R, 179184, H05F 302

Patent

active

040401200

ABSTRACT:
A telecommunications terminal apparatus, connected to a transmission facility which includes a source of energizing current and an earth connection, is protected from static discharge of the type typically originating with a user. The terminal apparatus includes an ABS housing with one or more apertures therein to facilitate user actuation of various control buttons or keys. The periphery of each aperture is rendered electrically conductive. A low impedance sink such as a remote power supply, earth or a transmission line is connected to the electrically conductive periphery via a variable impedance element, for example a pair of back to back zener diodes. The housing also includes a conductive foot for contact with a supporting surface. The conductive foot is also connected with the conductive periphery of the aperture. In the case where the electronic circuitry includes a CMOS integrated circuit, an anti-latch circuit is included to prevent destruction of the CMOS integrated circuit which could otherwise be induced by a nearby static electrical discharge.

REFERENCES:
patent: 3627930 (1971-12-01), Tolman
patent: 3711742 (1973-01-01), Pinkham, Jr.
patent: 3780345 (1973-12-01), Earman, Jr.

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