Optical head control circuit for optical tape recording/reproduc

Details Optical head control circuit for optical tape recording/reproduc Optical head control circuit for optical tape recording/reproduc

1990-09-13

1993-08-24

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 97, G11B 709

Patent

active

052395286

ABSTRACT:
A control circuit for controlling the position of a head in an optical tape recording/reproducing device having a rotary optical head controls the position of the head at the instant that it faces the tape based upon a desired head position derived from a preceding period in which it was facing the tape. A head position error signal is sampled and added to a sample head position signal during a period when the head is facing the tape and is held during the time the head is not facing the tape. The instant the head begins to face the tape once again, this desired value that has been held is applied to the head in order to reduce the pull-in time of the control circuit and provide more time for information recording/reproduction during the time the rotary optical head is facing the tape.

REFERENCES:
patent: 4416001 (1983-11-01), Ackerman et al.
patent: 4495609 (1985-01-01), Russell
patent: 4633455 (1986-12-01), Hudson
patent: 4661941 (1987-04-01), Bell et al.
patent: 4669070 (1987-05-01), Bell
patent: 4970707 (1990-11-01), Hara et al.

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