Optical pickup and optical drive

Details Optical pickup and optical drive Optical pickup and optical drive

2011-01-25

2011-01-25

Negrón, Daniell L (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112070, C369S044410

Reexamination Certificate

active

07876659

ABSTRACT:
An optical pickup including a two-wavelength multilaser for generating a tracking error signal and a focusing error signal with high accuracy without light quantity variations which otherwise might be caused by the interference. An optical beam of first wavelength is emitted from first laser light source, and an optical beam of second wavelength longer than the first wavelength is emitted from second laser light source. The optical beams of the first and second wavelength are each split into at least one main optical beam and two sub-optical beams by a grating having, in a single plane, a first grating pattern area for splitting the optical beam of the first wavelength and a second grating pattern area for splitting the optical beam of the second wavelength. The area of the first grating pattern area is larger than the area of the second grating pattern area.

REFERENCES:
patent: 7365296 (2008-04-01), Tsukihashi et al.
patent: 2007/0019530 (2007-01-01), Kawamura et al.
patent: 1892848 (2007-01-01), None
patent: 1905026 (2007-01-01), None
patent: 2003-272218 (2003-09-01), None
patent: 2005-85369 (2005-03-01), None
patent: 2007-35109 (2007-02-01), None

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