Touch sensitive input for electronic wristwatch and/or electroni

Details Touch sensitive input for electronic wristwatch and/or electroni Touch sensitive input for electronic wristwatch and/or electroni

1976-10-08

1978-08-08

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307314, 328 5, 340365E, 58 23R, H03K 326, G08B 2100, G04C 300

Patent

active

041059026

ABSTRACT:
A touch sensitive input particularly suited for use with an electronic wristwatch, an electronic calculator or a combination thereof is provided. The touch sensitive input includes a touch sensitive contact connected to the input of a detector circuit, the detector circuit input being normally referenced to a first potential for producing a detector circuit output signal representative of the first potential. Engagement of the touch sensitive contact selectively references the detector circuit input to a second potential and in response thereto produces a detector circuit output signal representative of the second potential. The detector circuit includes at least an MOS or C-MOS input stage. Additional circuitry is provided for eliminating chatter in the output signal produced by the input stage, for preventing the producing of two signals representative of the unintended engagement of more than one touch sensitive contact, and for providing an indication that a touch sensitive contact has been inadvertently engaged.

REFERENCES:
patent: 3624518 (1971-11-01), Dildy, Jr.
patent: 3736445 (1973-05-01), Van Sickle
patent: 3737673 (1973-06-01), Suzuki
patent: 3909625 (1975-09-01), Colglazier et al.
patent: 3925978 (1975-12-01), Naito
patent: 3944843 (1976-03-01), Vaz Martins

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