Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-09-06
2005-09-06
Patel, G R (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S047370, C369S112100, C369S112150, C369S112190, C369S044230
Reexamination Certificate
active
06940789
ABSTRACT:
An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodetector device. The spot shape correcting unit corrects part or all of light spots formed on the photodetector by a light beam reflected back by the optical disc so that the spot diameter in a direction traversing a track on the optical disc will be larger than the spot diameter along the track.
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Kananen Ronald P.
Patel G R
Rader & Fishman & Grauer, PLLC
Sony Corporation
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