Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-02-02
1993-06-29
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
052240851
ABSTRACT:
An optical recording and reproducing apparatus comprising an erroneous recording prevention component which prevents this apparatus from making an erroneous recording or erasing operation while it records data on a writable disk. The apparatus is arranged such that, while it is performing a recording or erasing operation, a state of its beam of light just about to go off the control point of tracking and a state of its beam of light just about to go off the control point of focusing are each monitored and, when either of the states is detected, the recording or erasing operation is canceled. Hence, laser power of the beam of light can be controlled before the beam of light completely goes off the control point of tracking, thereby preventing the beam of light from affecting data having been recorded along other tracks.
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Patent Abstract of Japan, vol. 6, No. 255 (P-162) Dec. 14, 1982 (Mizuno).
Okawa Sumihiro
Shinkai Hiroyuki
Tosaka Susumu
Wachi Shigeaki
Eslinger Lewis H.
Maioli Jay H.
McElheny Jr. Donald
Sony Corporation
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