Optical pickup device

Details Optical pickup device Optical pickup device

2006-07-03

2010-10-26

Chow, Lixi (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112060, C369S112070, C369S112020

Reexamination Certificate

active

07821899

ABSTRACT:
The present invention provides an optical pickup device requiring no position adjustment of a diffraction grating at the time of assembling the optical pickup device, and capable of suppressing fluctuations in a differential push-pull signal amplitude and cancelling a push-pull offset.An optical pickup device200of an embodiment of the present invention has a diffraction grating230of a special shape including predetermined grooves and two kinds of lattice grooves arranged at a pitch determined on the basis of a pitch of grooves formed in the surface of an optical disk50, numerical aperture, wavelength of a light beam, and effective diameter of the light beam applied on the optical disk50.To suppress push-pull signals generated in the ± first-order diffraction rays, reflection rays from the optical disk50of a zeroth-order diffraction ray and ± first-order diffraction rays are detected, and signals corresponding to light reception results are output to a reproduction unit150, a control unit130, and an actuator servo circuit140.

REFERENCES:
patent: 7197004 (2007-03-01), Horiyama
patent: 2004/0196771 (2004-10-01), Shimano et al.
patent: 2005/0276206 (2005-12-01), Katayama
patent: 11-296875 (1999-10-01), None
patent: 2001-250250 (2001-09-01), None
patent: 2003-162831 (2003-06-01), None
patent: 2004-86957 (2004-03-01), None
patent: 2004-95077 (2004-03-01), None
patent: 2005-100550 (2005-04-01), None

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