A tracking circuit for returning an optical beam to a track bein

Details A tracking circuit for returning an optical beam to a track bein A tracking circuit for returning an optical beam to a track bein

1988-09-28

1991-07-16

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, G11B 700

Patent

active

050330411

ABSTRACT:
A tracking circuit for an optical scanner to return a light beam to a data storage track of a disk that was scanned by the light beam, after the light beam was deflected away as a result of an outside random shock or vibration. A difference amplifier generates a tracking error by taking the difference between two photovoltages. A directional logic circuit in the form of a D flip-flop determines which direction the light beam was deflected away from the data storage track that was scanned by the light beam. The light beam may skip storage tracks when it is deflected away from the track that was being scanned. The number of storage tracks that were skipped by the light beam, in this manner, are counted by an up-and-down counter, and this counter emits a control signal which is dependent on the state of the counter for deflecting the light beam back to the data storage track that was scanned. The counter output is applied to a control amplifier through a pulse shaper. The output of the difference amplifier in the form of the tracking error is applied to the control amplifier through a controllable switch that has a control input from the counter.

REFERENCES:
patent: 4365324 (1982-12-01), Michaelis
patent: 4476555 (1984-10-01), Joichi et al.
patent: 4805163 (1989-02-01), Ohnuki

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