Optical position detecting apparatus for positioning an actuator

Details Optical position detecting apparatus for positioning an actuator Optical position detecting apparatus for positioning an actuator

1985-04-01

1987-03-17

LaRoche, Eugene R.

Optics: measuring and testing

By polarized light examination

With light attenuation

250205, 250237G, G01B 1114, G01J 132

Patent

active

046503323

ABSTRACT:
In an optical position detecting apparatus using moire, two light receiving elements are associated with a single light emitting element, and moire or grating portions of an auxiliary moire i.e., fixed sub-scale opposing the respective light receiving elements are arranged such that detection signals produced from the two light receiving elements upon movement of a movable moire i.e., main scale are substantially 180.degree. out of phase. The difference between the detection signals from the light receiving elements is used as a positioning signal, and the sum of the detection signals from the light receiving elements is used as a signal for controlling the input of the light emitting element.

REFERENCES:
patent: 3597750 (1971-08-01), Brunner et al.
patent: 4385836 (1983-05-01), Schmitt
patent: 4472629 (1984-09-01), Ort
patent: 4523089 (1985-06-01), Maeda et al.

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