Touch sensitive computer input device

Details Touch sensitive computer input device Touch sensitive computer input device

1978-10-16

1981-01-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250222R, H01J 4014

Patent

active

042477670

ABSTRACT:
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 detected.

REFERENCES:
patent: 3128340 (1964-04-01), Harmon
patent: 3187185 (1965-06-01), Milnes
patent: 3764813 (1973-10-01), Clement et al.

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