Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-04-17
1986-12-23
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
33125C, 250231SE, H01J 314
Patent
active
046314040
ABSTRACT:
A position measuring system includes for the determination of a reference position at least one additional reference scanning unit which is shiftable relative to the measuring scale, independently of the measuring scanning unit and the measuring scale, and accordingly of the machine components connected to the measuring scanning unit and the measuring scale. The measuring scale carries an incremental graduation and a reference mark, and the measuring scanning unit and the reference scanning unit carry indicator blocks which on coincidence form a zero indicator. In order to determine the reference position, the reference marks and the zero indicator are scanned successively, but in arbitrary sequence, and their differential spacing is determined with the aid of a graduation of the reference scanning unit.
REFERENCES:
patent: 4326128 (1982-04-01), Klein
patent: 4403859 (1983-09-01), Ernst
patent: 4519140 (1985-05-01), Schmitt
patent: 4554741 (1985-11-01), Affa
Burkhardt Horst
Dangschat Holmer
Ernst Alfons
Wogatzke Horst
Johannes Heidenhain GmbH
LaRoche Eugene R.
Mottola Steven J.
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