Piezoceramic capsule for telephone instruments

Details Piezoceramic capsule for telephone instruments Piezoceramic capsule for telephone instruments

1994-02-24

1995-12-26

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

381173, 310324, H04R 2500

Patent

active

054795214

ABSTRACT:
A piezoceramic capsule for telephone instruments, of the type comprising a terminal-holder spool, a piezoceramic diaphragm in pressure contact with nail-shaped feed-through terminals forced in the spool, an elastic O-ring for producing the contact pressure and a perforated case housing them, is modified to transform the case into a cover-up disc and the spool into a case being provided with a stepped cylindric cavity designed to house, from the bottom to the top, respectively, the diaphragm, the elastic O-ring and the cover-up disc. A plurality of resilient pawls are formed by pressing inside respective cuts provided in the sidewall of the opening of said cylindric cavity and designed to snap on said cover-up disc in a closure position.

REFERENCES:
patent: 4536673 (1985-08-01), Forster
patent: 4944017 (1990-07-01), Cognasse et al.
patent: 5021701 (1991-06-01), Takahashi
patent: 5195142 (1993-03-01), D'Avolio et al.

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