Telephone handset with static discharge prevention

Details Telephone handset with static discharge prevention Telephone handset with static discharge prevention

1986-06-23

1989-01-03

Ng, Jin F.

Telephonic communications

Terminal

Housing or housing component

381157, 381169, 381188, H04M 104

Patent

active

047962887

ABSTRACT:
A telephone handset with static discharge prevention has a dielectric membrane extending over the metal ferrule of the transmitter, the membrane spaced from the ferrule by an annular dielectric spacer. At the receiver, a metal shunt on the front of the receiver has a central aperture for acoustic access. An annular dielectric membrane is positioned in the aperture and a dielectric membrane extends over the aperture, dielectric member and shunt. The membrane has a small hole within the annular dielectric member. The dielectric membrane at the transmitter increases the breakdown voltage to a value which will avoid static discharge to the user. The dielectric membrane and dielectric spacer at the receiver forms a long and sinuous discharge path which raises the breakdown voltage to a value which also avoids static discharge to a user.

REFERENCES:
patent: 3148249 (1964-09-01), King
patent: 3243527 (1966-03-01), Sternheim
patent: 4117275 (1978-09-01), Miyanaga et al.
patent: 4130740 (1978-12-01), Cogan
patent: 4263484 (1981-04-01), Hisatsune et al.
patent: 4424419 (1984-01-01), Chaput et al.
patent: 4529846 (1985-07-01), Freeman
patent: 4584702 (1986-04-01), Walker, Jr.
patent: 4594478 (1986-06-01), Gumb et al.
patent: 4636591 (1987-01-01), Kuhfus et al.
"Handsets with Hand Tailored Features", Audiosears Corporation, Telephony, Jul. 11, 1970, p. 59.

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