Optical pickup device and information recording/reproduction...

Details Optical pickup device and information recording/reproduction... Optical pickup device and information recording/reproduction...

2006-05-17

2010-11-16

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112050

Reexamination Certificate

active

07835250

ABSTRACT:
The present invention makes it possible to accurately and adequately adjust the position where sub beams are shone when performing tracking correction or CTC using three beams.The invention adjusts the positions where the sub beams are shone onto the surface of an optical disc DK by changing the angle of a diffraction grating211that is mounted inside an optical pickup. When performing adjustment, the angle of the diffraction grating211is performed in three stages: (i) rough adjustment, (ii) initial fine adjustment and (iii) continuous fine adjustment.

REFERENCES:
patent: 6754162 (2004-06-01), Fujita et al.
patent: 6781930 (2004-08-01), Fukumoto
patent: 2005/0002314 (2005-01-01), Hasegawa et al.
patent: 2005/0122862 (2005-06-01), Shin et al.
patent: 5-144075 (1993-06-01), None
patent: 2001-357550 (2001-12-01), None
patent: 2002-15442 (2002-01-01), None
patent: 2002-183992 (2002-06-01), None

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