Photoelectrical encoder employing an optical grating

Details Photoelectrical encoder employing an optical grating Photoelectrical encoder employing an optical grating

1982-05-21

1985-02-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356395, G01B 1100, G08C 906

Patent

active

044993749

ABSTRACT:
A photoelectrical encoder wherein a physical quantity is detected from brightness obtained by moving a first and a second scales each provided thereon with an optical grating relative to each other, characterized in that the grating in one of the scales is constructed such that a first signal lead-out material layer made of a light shielding conductive material, a PN semiconductor layer for converting light into electricity and a second signal lead-out material layer made of a light transmitting conductive material are laminated on a light transmitting base member in the described order to form a narrow belt-shaped light receiving portion and a plurality of narrow belt-shaped light receiving portions thus formed are arranged at regular pitches, as against the light from the light transmitting base member, the light receiving portions function as light shielding slits and intervals between the light receiving portions are formed into light transmitting slits.

REFERENCES:
patent: 3600588 (1971-08-01), Sayce

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