Optical encoder with fiber optics

Details Optical encoder with fiber optics Optical encoder with fiber optics

1977-09-16

1979-07-24

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 324175, G01D 534

Patent

active

041623991

ABSTRACT:
Light is modulated by an optical code member having first and second parallel tracks, each with alternate segments of different optical characteristics, such as optical reflectivity. The different segments are staggered between the parallel tracks. The modulated light is transmitted along first and second fiber optic elements from the first and second tracks to respective first and second photoelectric sensors having a common substrate to produce push-pull electrical outputs from said sensors. The light may be supplied to the first and second tracks by respective third and fourth fiber optic elements, which may extend from a common light source. The third and fourth fiber optic elements may have light supplying ends which are closely adjacent the light receiving ends of the first and second fiber optic elements.

REFERENCES:
patent: 3364359 (1968-01-01), Cronin
patent: 3575129 (1971-04-01), Sullivan
patent: 3706874 (1972-12-01), Lockard
patent: 3778157 (1973-12-01), Brelot et al.
patent: 3786238 (1974-01-01), Heisner
patent: 3875405 (1975-04-01), Ferguson
patent: 3906223 (1975-09-01), White
patent: 3947691 (1976-03-01), Goldstein
patent: 4064504 (1977-12-01), Lepetit et al.

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