Reference position detecting device utilizing a plurality of pho

Details Reference position detecting device utilizing a plurality of pho Reference position detecting device utilizing a plurality of pho

1990-10-03

1991-10-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

050597914

ABSTRACT:
A reference position detecting device comprises an optical device for directing a light beam to a pattern indicating the reference position and plural photoreceptor elements for receiving the light beam obtained through the pattern. A reference position signal is obtained from signals from the photoreceptor elements.

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H. Nauman/G. Schroder, Bauelemente der Optik, Carl Hauser Verlag Muchon Wien 1983, pp. 559-563 (with English translation of pp. 559-561).

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