Sentech, Inc.

Microtouch System Inc.

Jianming Huang

An improved position responsive sensor is disclosed comprising a substrate having first and second parallel, conductive strips at the edges in electrical contact with high resistance coating on the top surface and low resistance coating on the bottom surface respectively. A d. c. voltage is applied to the top surface of substrate, at the same time an a. c. voltage is applied to the bottom surface. An electrical conductive probe or a flexible resistive sheet is used to detected both d. c. and a. c. voltage between the contact point and the ground, whereby the electrical output signals are accurately related to the x and y coordinates of the contacted point on the top surface of substrate.

Electrical probe-position sensor

A touch position sensor is shown in which a transducer or transducer array mounted to a side of a substrate generates pulse shear-mode acoustic wave and receives the partial wave reflected by the finger or other styles. An electronic circuitry connected to the transducers determine the position of the finger or style in geometrical coordinate terms by detecting time interval between the transmitted wave and reflected wave.

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Round Rock, TX, United States of America

Jianming Huang