Method and apparatus for tracking an optically readable informat

Details Method and apparatus for tracking an optically readable informat Method and apparatus for tracking an optically readable informat

1978-12-13

1980-11-04

Cook, Daryl W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, 1791003V, H04N 576, H04N 302

Patent

active

042323371

ABSTRACT:
Apparatus, and a related method, for maintaining an incident beam of radiation in alignment with the centerline of a movable, optically-readable information track, wherein the track comprises a succession of light-reflecting and light-scattering regions representative of a frequency modulated carrier and the sides of the track are adapted to scatter incident radiation in predetermined directions. The apparatus includes photodetector means for sensing the amount of radiation scattered by each side of the track and for generating an error signal indicative of the deviation of the incident beam relative to the centerline of the track, along with means responsive to the error signal for controllably moving the incident beam into alignment with the centerline of the track.

REFERENCES:
patent: 3931459 (1976-01-01), Korpel
patent: 4044378 (1977-08-01), Laub
patent: 4065786 (1977-12-01), Stewart

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