Target track position retrieval device

Details Target track position retrieval device Target track position retrieval device

1990-12-18

1993-06-01

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 43, 369 47, 369 50, 360 7806, G11B 700

Patent

active

052166473

ABSTRACT:
This invention is directed to a target track retrieval device comprising a signal playback apparatus for playing back signals from information tracks recorded on a rotary disc rotatably driven at constant linear velocity, a movement circuit for moving the playback apparatus in a direction traversing the information tracks, a counter responsive to the signals from the playback apparatus to count the number of information tracks traversed by the playback apparatus, and a control circuit for comparing target position information indicating a target track position and a count value of the counter to stop movement of the playback apparatus when the target position information and the count value are in correspondence with each other. The number of tracks [M] from a present track position to the target track is determined as a function of the number of tracks [n] to be traversed by the playback apparatus during a playback time [t.sub.n ] from a reference track to the target track, in accordance with: ##EQU1## where [v.sub.o ] is the linear velocity, [p] is the track pitch and [r.sub.o ] is the radius of the reference track; and the rotational velocity of the rotary disc when the target track is reached is controlled by velocity information [.DELTA.t.sub.n ] which represents the time required for one rotation of the target track wherein: ##EQU2##

REFERENCES:
patent: 4751693 (1988-06-01), Yoshimaru
patent: 4825431 (1989-04-01), Kimura et al.
patent: 4873679 (1989-10-01), Murai et al.
patent: 5012461 (1991-04-01), Yoshida et al.

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