Telephone handset with static discharge prevention

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

H - Electricity

04

M

317/3, 349/59

H04M 1/04 (2006.01)

Patent

CA 1275323

TELEPHONE HANDSET WITH STATIC DISCHARGE PREVENTION Abstract of the Disclosure 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.

512058

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