Reference position-detecting device for photoelectric encoder

Details Reference position-detecting device for photoelectric encoder Reference position-detecting device for photoelectric encoder

1985-03-08

1987-07-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 340347P, G01D 534

Patent

active

046789103

ABSTRACT:
A reference position-detecting device for use with a photoelectric, incremental encoder which produces a sinusoidal signal in response to the movement of an index scale relative to a main scale. A pattern comprising bright portions and dark portions alternately arranged is formed on the main scale. A similar pattern is formed on the index scale. The device comprises a random pattern formed at some location of the main scale, a similar random pattern formed at some location of the index scale, optical devices for producing a signal indicative of a reference position, a first pulse generator for producing pulses in response to the signal above, second and third pulse generators for producing two kinds of pulses that are 90.degree. out-of-phase in response to the sinusoidal signal, a direction detector for detecting the direction of the movement of the index scale, an analog switch having non-inverting and inverting inputs, a counter for counting the count pulses from the switch, and a fourth pulse generator for resetting the counter on the leading or trailing edge of each count pulse during the presence of the pulses indicating the reference position.

REFERENCES:
patent: 4123750 (1978-10-01), Leney et al.
patent: 4143364 (1979-03-01), Dlugos
patent: 4240069 (1980-12-01), Hullein et al.
patent: 4266215 (1981-05-01), Adams
patent: 4443787 (1984-04-01), Denk et al.
patent: 4451731 (1984-05-01), Leonard
patent: 4477189 (1984-10-01), Ernst
patent: 4580047 (1986-04-01), Sasaki et al.

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