Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-01-23
1999-02-23
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 32, 369 4439, G11B 1100
Patent
active
058751556
ABSTRACT:
An optical disk presents unit an object lens from being affected by an external disturbance caused by a reversed moving direction of an optical head when information is recorded or reproduced to or from an optical disk. The last moving direction of an optical head which has arrived at a target position of an optical disk is detected and, if it is opposite to a moving direction of the optical head for recording or reproducing information, the moving direction is inverted to the recording/reproducing moving direction before the optical head starts recording or reproducing information. At the time when the optical head inverts the moving direction, recording or reproduction of the information is not started. Therefore, no vibration or shock is applied to an object lens at the beginning of a recording or reproducing operation which might cause errors.
REFERENCES:
patent: 5084661 (1992-01-01), Tanaka
patent: 5331611 (1994-07-01), Matsuba
patent: 5485434 (1996-01-01), Chaja
patent: 5581524 (1996-12-01), Fujino
Neyzari Ali
Ricoh & Company, Ltd.
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