Reference signal generation apparatus for position detector with

Details Reference signal generation apparatus for position detector with Reference signal generation apparatus for position detector with

1989-12-18

1991-03-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534, H01J 516

Patent

active

050031708

ABSTRACT:
A reference signal generation apparatus for a position detector is disclosed in which a plurality of signals having peaks at predetermined intervals are produced from the light transmitted through slit rows of random patterns and a plurality of light detectors for detecting the same light, thereby producing a reference signal in the vicinity of maximum and minimum values of the difference signal between the output signals of the light detectors.

REFERENCES:
patent: 3326077 (1967-06-01), Vandermeer
patent: 3996463 (1976-12-01), Jablonowski
patent: 4218615 (1980-08-01), Zinn, Jr.
patent: 4477189 (1984-10-01), Ernst
patent: 4664524 (1987-05-01), Hattori et al.
patent: 4678908 (1987-07-01), LaPlante
patent: 4708484 (1987-11-01), Komeyama et al.
patent: 4712016 (1987-12-01), Matsumura
patent: 4794251 (1988-12-01), Scholian
patent: 4883955 (1989-11-01), Kawasaki et al.

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