Optical encoder improvement

Details Optical encoder improvement Optical encoder improvement

1982-02-09

1984-09-18

Orsino, Jr., Joseph A.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

307471, H01J 3900

Patent

active

044726295

ABSTRACT:
An optical position encoder system comprising a circuit for removing the electrical bias usually associated with the optical sensor outputs, and for generating a voltage output varying with the encoder position to produce an indication of angular or linear displacement between zero crossings is described. In one portion of the circuit, sensor output signals 180 degrees out of phase are subtracted to automatically cancel the bias. In another portion of the circuit, signals 90 degrees out of phase are used to generate a voltage, the amplitude of which is a function of the grid position between grid zero crossings. To accomplish these results, two or more angularly displaced grids are required.

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patent: 4246497 (1981-01-01), Lawson et al.
patent: 4308500 (1981-12-01), Avins
patent: 4360730 (1982-11-01), Breslow

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