Absolute encoder having absolute pattern graduations and increme

Details Absolute encoder having absolute pattern graduations and increme Absolute encoder having absolute pattern graduations and increme

1994-10-27

1996-10-08

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 250237G, G01D 534

Patent

active

055634087

ABSTRACT:
An absolute encoder having a coder in which an incremental pattern and an absolute pattern are arranged in parallel and a detector including sensors for detecting the incremental pattern and the absolute pattern respectively. The absolute encoder comprises a discriminater to discriminate a relative phase position of the coder and the detector in one pitch of the incremental pattern from an output of the sensor for detecting the incremental pattern, and a signal generator to generate a synchronizing signal when a discriminated phase position coincides with a predetemined phase position by means of an electric circuit in one pitch of the incremental pattern. The absolute pattern is read on the basis of the synchronizing signal at a position except for the boundary region between the minimum reading units.

REFERENCES:
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patent: 4945231 (1990-07-01), Ohya et al.
patent: 5068529 (1991-11-01), Ohno et al.
patent: 5120954 (1992-06-01), Taniguchi

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