Digital position sensor for indicating the relative position of

Details Digital position sensor for indicating the relative position of Digital position sensor for indicating the relative position of

1989-09-25

1990-12-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 341 13, G01D 534

Patent

active

049805487

ABSTRACT:
A position sensor for supplying digital signals corresponding to the position of a movable part in non-contacting, reliable fashion. A number of individual electrodes are applied on a substrate with a layer of a-Si:H applied thereon. A common, large-area collector electrode is applied over the a-Si:H layer. A light beam is moved over the collector electrode to activate a predetermined combination of photosensitive pixels which may be photodiodes or photoresistors. These pixels are situated between the individual electrodes and the common collector electrode. The output signals of the photodiodes are in the form of a digital code that characterizes the location of the light beam.

REFERENCES:
patent: 3521271 (1970-07-01), Rappaport
patent: 4412206 (1983-10-01), Schwefel
patent: 4445110 (1984-04-01), Breslow
patent: 4496835 (1985-01-01), Boella et al.
patent: 4521875 (1985-06-01), Harrington
patent: 4524347 (1985-06-01), Rogers
patent: 4556816 (1985-12-01), Imamura et al.

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