Matsushita Electric Industrial Co., Ltd.

Showa Shell Sekiyu K.k.

Teruo Namba

Atsushi Nishino

Akihiko Yoshida

Masaaki Aoki

Atsushi Naito

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.

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Tokyo, Japan

Teruo Namba