Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2011-04-26
2011-04-26
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112240
Reexamination Certificate
active
07933177
ABSTRACT:
An optical pickup apparatus includes a light source, focusing optics, a light detector, a controller, and a drive unit. The drive unit first drives the focusing optics to a specific position on an information recording medium. Light from the light source irradiates the information recording medium via the focusing optics as near-field light. Light reflected off the medium due to total internal reflection is then detected by the light detector, generating a gap error signal as a result. The controller then generates a gap servo signal by conducting a feed-forward control, whereby a push-pull signal in the direction orthogonal to the relative travel direction of the medium is applied to the gap error signal. In so doing, precise control of the gap size between the focusing optics and the information recording medium is achieved for near-field read/write operations.
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Agustin Peter Vincent
Sony Corporation
Wolf Greenfield & Sacks P.C.
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