Optical disk unit

Details Optical disk unit Optical disk unit

2011-03-22

2011-03-22

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370, C369S044290, C369S053280

Reexamination Certificate

active

07911890

ABSTRACT:
An optical disc drive includes: an optical branching element for splitting light from a light source into main and sub-beams; a condenser element for condensing the main and sub-beams; a photodetector section including photodetectors to receive reflected portions of the main and sub-beams, each photodetector having photosensitive areas, each of which outputs a signal representing the intensity of light received there; and a computing section for generating a first focus signal, representing where the focal point of the main beam is located with respect to the storage layer, based on the reflected light of the main beam, and a second focus signal based on the reflected light of the main and sub-beams.

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International Search Report for corresponding Application No. PCT/JP2006/318144 dated Oct. 17, 2006.
Form PCT/ISA/237 and partial English translation.

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