Circuit for correcting output phase of rotary encoder

Details Circuit for correcting output phase of rotary encoder Circuit for correcting output phase of rotary encoder

1987-04-09

1989-02-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 341 13, 371 30, G01D 534

Patent

active

048033545

ABSTRACT:
A circuit for correcting a variation in phase of a train of clock pulses detected from a pattern of a coding disc of a rotary encoder which detects the rotation angle of a rotating shaft, comprises an ROM in which data for correction of a phase variation corresponding to the rotation angles of the coding disc are preliminarily stored. The correction data are read from the ROM by designating addresses of the ROM by means of the counter which counts up a train of clock pulses from the rotary encoder before the clock pulse train is subjected to correction. The clock pulses are phase-modulated by the correction data from the ROM to provide a corrected train of clock pulses which correctly represent the rotation angles of the rotating shaft.

REFERENCES:
patent: 3364359 (1968-01-01), Cronin
patent: 4335306 (1982-06-01), Gort et al.
patent: 4346447 (1982-08-01), Takahama
patent: 4427882 (1984-01-01), Nakaoki et al.
patent: 4580047 (1986-04-01), Sasaki et al.
patent: 4593193 (1986-06-01), Michaelis
patent: 4638155 (1987-01-01), Dorr

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