Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-01-21
1994-08-16
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 4434, 369 4435, 369 4438, 235454, G11B 709
Patent
active
053393007
ABSTRACT:
An apparatus performs servo control of a recording light beam by using a reproducing light beam. The reproducing light beam, which does not destroy the recording material of an optical card, is emitted from a reproducing LD to the optical card. The position of the reproducing light beam is controlled by a control unit. A light beam which does not destroy the recording material of the optical card is emitted from a recording LD to the optical card. The position of the light beam from the recording LD is detected by a recording PD and the detected error signal is stored in the control unit. The reproducing light beam is emitted again from the reproducing LD to the optical card together with emitting the recording light beam, which can destroy the recording material of the optical card, from the recording LD. The position of the recording light beam is controlled by the control unit based on the reflected light beam of the reproducing light beam from the optical card and on the stored signal in the control unit.
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Olympus Optical Co,. Ltd.
Young W. R.
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