Optical pickup device, optical disk drive, optical device...

Details Optical pickup device, optical disk drive, optical device... Optical pickup device, optical disk drive, optical device...

2008-03-18

2008-03-18

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112140, C369S112280

Reexamination Certificate

active

07345982

ABSTRACT:
An optical pickup device is provided which includes a double-wavelength objective lens (34) that collects a light beam selectively emitted from a light-emitting/-detecting element (31) that selectively emits a plurality of light beams different in wavelength from each other, and also return light from an optical disk (2), a first diffraction grating (45) that splits the light beam emitted from a light-emitting/-detecting element (31) into three beams including a zero-order light beam and positive and negative first-order light beams, a second diffraction grating (46) that diffracts the return light for traveling along a light path separate from that of the outgoing light, and a third diffraction grating (47) that corrects a light-path deviation by diffracting the positive first-order light beam diffracted by the second diffraction grating (46). The light-emitting/-detecting element (31) provides a focusing error signal FE by detecting the negative first-order light beam diffracted by the third diffraction element (47), and a tracking error signal by detecting return portions of the positive and negative first-order light beams from the first diffraction grating (45).

REFERENCES:
patent: 6072579 (2000-06-01), Funato
patent: 6487016 (2002-11-01), Shiono et al.
patent: 6560188 (2003-05-01), Kyoya et al.
patent: 6868055 (2005-03-01), Ueyama et al.
patent: 6952389 (2005-10-01), Kyoung et al.
patent: 2002-298423 (2002-10-01), None
patent: 2002-311220 (2002-10-01), None
patent: 2002-311221 (2002-10-01), None

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