Optical head, light-emitting/receiving device, and apparatus...

Details Optical head, light-emitting/receiving device, and apparatus... Optical head, light-emitting/receiving device, and apparatus...

2008-01-15

2008-01-15

Patel, Gautam R. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047370

Reexamination Certificate

active

07319644

ABSTRACT:
An optical head in which focusing 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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International Search Report, Apr. 24, 2001.
EPO Supplemental Search Report, Nov. 4, 2002.

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