Touch sensitive computer input device

Details Touch sensitive computer input device Touch sensitive computer input device

G - Physics

01

B

375/38, 340/135.

G01B 21/04 (2006.01) G01B 11/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1109539

ABSTRACT OF THE DISCLOSURE Apparatus for detecting the position of an object, e.g. for interaction with a computer graphic display, has a number of light emitting diodes in an endless array, and a lesser number of light detecting devices for providing electrical signals in response to momentary and successive energization of the light emitting diodes. The signals are electronically processed to provide cartesian co-ordinates. This apparatus provides high resolution with a minimum number of light detecting devices and enables too large objects and malfunctions to be readily de- tected.

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