Position measuring rotary incremental optical encoder

Details Position measuring rotary incremental optical encoder Position measuring rotary incremental optical encoder

1998-01-30

2000-07-25

Ham, Seungsook

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 33707, G01D 534

Patent

active

060939281

ABSTRACT:
An incremental encoder has a rotor provided with a plurality of indices and is capable of detecting a reference point or a zero point without turning the rotor one full turn. Graduation lines of a main scale are counted until a detector detects an index I.sub.1 and the next index I.sub.2, the angle or the distance between the reference point and the index I.sub.2 is determined on the basis of the counted number of graduation lines of the main scale, the angle or the distance between the position of the index I.sub.2 and an optional position is determined on the basis of the corresponding number of graduation lines of the main scale, and the angle or the distance between the reference point and the optional position is determined by adding the angle or the distance between the reference point and the position of the index I.sub.2 to the angle of the distance between the position of the index I.sub.2 and the optional position.

REFERENCES:
patent: 4793067 (1988-12-01), Reimar et al.
patent: 5129725 (1992-07-01), Ishizuka et al.
patent: 5171982 (1992-12-01), Kronenberg

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