Reference signal generation apparatus for position detector

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

1988-05-03

1990-02-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534, H01J 314

Patent

active

049009249

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: 3187187 (1965-06-01), Wingate
patent: 3326077 (1967-06-01), Vandermeer
patent: 4451731 (1984-05-01), Leonard
patent: 4477189 (1984-10-01), Ernst
patent: 4602155 (1986-07-01), LaPlante
patent: 4678910 (1987-07-01), Hara et al.
patent: 4794251 (1988-12-01), Scholian

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