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Pressure-Sensitive Cursor Control Keypads

IP.com Disclosure Number: IPCOM000035024D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28

Publishing Venue

IBM

Related People

Authors:
Denoix, B McLean, JG Pickover, CA Reed, AR [+details]

Abstract

A technique is described whereby cursor control positioning keys or other keys, as used on a keyboard, can provide analog control signals using several different methods. Discussed are several approaches used in pressure-sensitive cursor controls: Two-Sponge Piezoelectric Key, Surface Acoustic Wave Key, Surface Acoustic Wave Cross Key, Two-Layer Device; and Capacitance/Sponge. Two-Sponge Piezoelectric Key The implementation of the two-sponge piezoelectric key assembly consists of key 10, as shown in the figure, keystem molded unit 11, soft sponge material 12, hard sponge material 13, piezoelectric sensor 14, and holder 15. Holder 15 contains the electrodes for the sensor and attaches to keyboard 16 so that the keys can make contact with circuit 17.