Feedback control system for linear position transducer

Details Feedback control system for linear position transducer Feedback control system for linear position transducer

1974-01-10

1976-03-16

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

250204, G11B 2110

Patent

active

039450376

ABSTRACT:
An electronic feedback control system which compensates for errors in the position information signals output from a pair of photodetectors in a linear motion position transducer, such as used to locate a read-write head over an addressed track in a magnetic disc file system. The control circuitry sums the instantaneous values of the time varying photodetector outputs to produce a combined output signal. The peak positive value of the combined signal is determined and compared with a preselected reference value. An error signal proportional to the difference between the peak and reference values is generated and amplified to produce a correction signal. The correction signal is then applied to the variable energization input of the light source which illuminates the photodetector pair. The correction signal reduces the error signal toward zero by causing the light source to compensate for error in the photodetector output signal.

REFERENCES:
patent: 3593333 (1971-07-01), Oswald
patent: 3597750 (1971-08-01), Brunner
patent: 3691543 (1972-09-01), Mueller

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