Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-09-06
1995-12-19
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369 4435, G11B 7085
Patent
active
054775140
ABSTRACT:
In an apparatus in which information is recorded on and reproduced from a rotating recording medium by irradiating the recording medium with a converged light beam, a focus control is performed so that the light beam on the recording medium is in a prescribed converged state. In order to perform a focusing pull of the focus control, until the rotation of the disk attains a predetermined rotation frequency, the focus lens is previously moved to the inner side of the disk, and moved away from the disk. After the predetermined rotation frequency is attained, the focusing pull operation of the focus control is started from the position. Thus, it is possible to secure a stable pulling capability and to shorten the activation time of the apparatus.
REFERENCES:
patent: 4901298 (1990-02-01), Masaki
patent: 5054013 (1991-10-01), Kawamura
patent: 5086420 (1992-02-01), Doi
patent: 5105399 (1992-04-01), Shimonou
patent: 5105407 (1992-04-01), Ishika
patent: 5107101 (1992-04-01), Ando
patent: 5289451 (1994-02-01), Ashimuma et al.
patent: 5406536 (1995-04-01), Doi
Ito Motoshi
Watanabe Katsuya
Matsushita Electric - Industrial Co., Ltd.
Psitos Aristotelis
Tran Thang V.
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