Optical encoding detecting coarse and fine position

Details Optical encoding detecting coarse and fine position Optical encoding detecting coarse and fine position

1995-05-30

1997-04-22

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 341 13, 356395, G01D 534

Patent

active

056231423

ABSTRACT:
An optical type encoder is comprised of a gauge member and a sensor portion moved relative to each other with the movement of an object to be detected. The gauge member has a plurality of slit rows comprising a plurality of slits formed at intervals along the direction of movement of the object to be detected, and a plurality of slit intervals formed by the corresponding slits in the slit rows are made partly equal. The sensor portion has at locations corresponding to the slit rows position detecting type light receiving means for receiving light beams from light projecting means passed through the plurality of slits rows of the gauge member, and the position information of the object to be detected is detected by the utilization of signals from these light receiving means.

REFERENCES:
patent: 4633224 (1986-12-01), Gipp et al.
patent: 4720699 (1988-01-01), Smith
patent: 4750821 (1988-06-01), Yamamoto et al.
patent: 4945231 (1990-07-01), Ohya et al.
patent: 5003171 (1991-03-01), Paley

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