Range mark position control employing optical encoding

Details Range mark position control employing optical encoding Range mark position control employing optical encoding

1980-08-04

1983-06-07

Sloyan, T. J.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

340347P, 340347M, 250231SE, H03K 1302, G01S 722

Patent

active

043873740

ABSTRACT:
An optical encoder device for use with a variable range mark display. An operator rotatable cylindrically shaped encoder wheel with longitudinal slits is panel mounted. Two light-emitting diodes are positioned outside the wheel opposite two phototransistors located inside the wheel. The light-emitting diode-phototransistor pairs are spaced at a forty-five degree angle from one another from the center of the wheel. Rotation of the wheel interrupts the light path between the light-emitting diodes and phototransistors producing two output signals. For one direction of rotation the first signal leads the second while for the other direction of rotation the first lags the second. A circuit is disclosed which determines from the output signals the direction of rotation and produces a count indicative of the amount of rotation.

REFERENCES:
patent: 2656106 (1953-10-01), Stabler
patent: 2896845 (1959-07-01), Hansen et al.
patent: 2921204 (1960-01-01), Hastings et al.
patent: 3646557 (1972-02-01), Scheer
patent: 3881176 (1975-04-01), Scheer
patent: 3963919 (1976-06-01), Sells
patent: 4015253 (1977-03-01), Goldstein
patent: 4077037 (1978-02-01), Bryden
patent: 4125834 (1978-11-01), Pease

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