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

1983-07-25

1986-07-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

046021558

ABSTRACT:
An improved apparatus for generating an index signal in incremental encoders, wherein an index sequence of code elements is provided on the code disc, and the degree of registration between the index sequence and a mask sequence is detected, and further wherein the mask sequence and index sequence are configured so that there is maximum registration of the elements between the index sequence and mask sequence for the index position of the code disc and the degree of registration for all other angular positions of the code disc is at or below a predetermined background registration level, and so that the degree of registration for angular positions adjacent to the index or zero reference position is greater than zero and preferably no greater than the background registration level.

REFERENCES:
patent: 3187187 (1965-06-01), Wingate
patent: 3326077 (1967-06-01), Vandemeer
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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