Title: Optical encoder with fiber optics

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.

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Inventors: Hudson, Charles L. (North Little Rock, AR, US)

Application Number: 833817
Filing Date: 1977-09-16
Publication_date: 1979-07-24
Assignee: BEI Electronics, Inc. (Little Rock, AR)
Primary Class(es): 250/231.14 250/227.11, 324/175
Other Classes:
US Patent Ref:

3364359	Jan, 1968	Cronin	250/231.
3575129	Apr, 1971	Sullivan	324/175.
3706874	Dec, 1972	Lockard	250/227.
3778157	Dec, 1973	Brelot et al.	250/227.
3786238	Jan, 1974	Heisner	250/227.
3875405	Apr, 1975	Ferguson	250/231.
3906223	Sep, 1975	White	250/231.
3947691	Mar, 1976	Goldstein	250/227.
4064504	Dec, 1977	Lepetit et al.	250/231.

Other Refs: 2505802

Aug, 1976	DE

Primary Examiner: Mullins, James B.
Assistant Examiner:
Attorney: Burmeister, York, Palmatier, Hamby & Jones