Touch sensor

Details Touch sensor Touch sensor

1994-02-16

1995-11-07

Wieder, Kenneth A.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

200600, 324686, H03K 17975

Patent

active

054650917

ABSTRACT:
A touch sensor has an LC oscillator circuit 1, 2, 3, and 4, a rectification circuit 10 which rectifies outputs of the oscillator circuit 1, 2, 3, and 4, a voltage detection circuit 12, 13, 14, and 15 which detects the rectified voltage, and a sensor plate 8 connected to the input section of the rectification circuit, and detecting contact of a finger with the sensor plate 8 by enabling the voltage detection circuit 12, 13, 14, and 15 to detects a drop of equivalent impedance due to a finger touching the sensor plate 8 as a change of voltage.

REFERENCES:
patent: 2782308 (1957-02-01), Rug
patent: 2873637 (1959-02-01), Herold
patent: 4233522 (1980-11-01), Grummer
patent: 4550310 (1985-10-01), Yamaguchi

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