Zero reference generating method and apparatus for optical encod

Details Zero reference generating method and apparatus for optical encod Zero reference generating method and apparatus for optical encod

1984-12-05

1987-07-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

046789081

ABSTRACT:
An encoder for providing positional information about a moveable member comprising code member means couplable to the moveable member for movement with the moveable member, reference means positioned to be stationary relative to the code member, an index sequence positioned on the code member, a mask sequence positioned on the reference member means, and means for detecting the degree of registration between the index sequence and the mask sequence, wherein the index sequence and the mask sequence include a plurality of building block patterns that are separated by predetermined spacings.

REFERENCES:
patent: 3187187 (1965-06-01), Wingate
patent: 3749925 (1973-07-01), Hertrich
patent: 3982106 (1976-09-01), Stutz
patent: 4451731 (1984-05-01), Leonard
patent: 4477189 (1984-10-01), Ernst

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