Track-jump device for a disc drive apparatus

Details Track-jump device for a disc drive apparatus Track-jump device for a disc drive apparatus

1991-02-14

1992-01-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4429, 369 32, G11B 700

Patent

active

050797565

ABSTRACT:
A track-jump device for a disc drive apparatus for jump from one track to a neighboring track on a disc-like recording medium. A tracking error signal S.sub.TE, an on-track signal S.sub.OT whose phase is deviated by 90.degree. relative to the tracking error signal according to displacement in the direction of track width and which exhibits a peak value when it is on the track, a signal S.sub.TE having a phase opposite to the tracking error signal, and signal S.sub.OT having a phase opposite to the on-track signal are successively switched by a switch (20) and are sent to a tracking device circuit (27) to effect the track-jump. The servo operation is continued even during the track-jump, and the servo loop is not interrupted. Therefore, track-jump is effected while maintaining advantage in regard to safety, reproducibility, and compatibility of pickups.

REFERENCES:
patent: 4416002 (1983-11-01), Oguino et al.
patent: 4843601 (1989-06-01), Eguchi et al.

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