Telephone test set keypad with integrated dynamic microphone

Details Telephone test set keypad with integrated dynamic microphone Telephone test set keypad with integrated dynamic microphone

1996-11-20

1998-06-16

Chiang, Jack

Telephonic communications

Terminal

Housing or housing component

379434, 379429, 379368, 379369, 379370, H04M 100

Patent

active

057683697

ABSTRACT:
Unwanted acoustic noise and environmental degradation associated with the use of a highly sensitive microphone in a telephone test set are eliminated by a microphone-integrated keypad laminate architecture, in which a microphone is snugly captured within a microphone holder molded into a pliable keypad unit and its leads sealed against the environment and case vibration. The keypad unit is supported by a keypad support structure adjacent to the test set's keypad face, so that the microphone holder is retained adjacent to an acoustic coupling port, and the keypad's keys are accessible by way of keypad apertures in the keypad face. A printed circuit board urges the keypad unit into engagement with the keypad support structure. The keypad unit and the printed circuit board have sealed aperture arrangements through which electrical leads of the microphone pass for connection to the circuit board.

REFERENCES:
patent: 3627930 (1971-12-01), Tolman

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