Optical disk storage which provides pull-in of focus servo and p

Details Optical disk storage which provides pull-in of focus servo and p Optical disk storage which provides pull-in of focus servo and p

1994-03-24

1995-08-01

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4425, 2502015, G11B 700

Patent

active

054385571

ABSTRACT:
A miniaturized optical disk apparatus which performs a pull-in of a focus servo and a pull-in of a tracking servo without a position detector for detecting an optical head. If the optical head is located at a non-reflection film area and thus the focus servo cannot be performed, then the optical head is moved and the focus servo is performed again. This process is repeated until the focus servo can be achieved. In addition, if the optical head is located at a non-track area, then the optical disk is moved to a track area and then the tracking servo is performed. This process also repeated until the optical head is located over the track area. The tracking servo can be stably performed since it is performed only when the optical head is located over the track area. The present invention is applicable to the optical disk apparatus which uses a 3.5 in optical disk.

REFERENCES:
patent: 4630252 (1986-12-01), Miura et al.
patent: 4901298 (1990-02-01), Masaki
patent: 4918676 (1990-04-01), Miyasaka
patent: 4972399 (1990-11-01), Miyasaka
patent: 5018121 (1991-05-01), Yamamuro
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5063549 (1991-11-01), Yamamuro
patent: 5146442 (1992-09-01), Shikichi

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