Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2009-06-17

2011-10-25

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053280, C369S112050

Reexamination Certificate

active

08045443

ABSTRACT:
An optical pickup apparatus comprising: a laser-light source that selectively emits first and second laser lights parallel with each other; a diffraction grating that includes a plurality of periodic structures joined to be different in phase from each other in a direction optically corresponding to an optical-disc-tracking direction, and generates 0th-order and ±1st-order-diffracted lights by diffracting the first or second laser light; an objective lens that focuses the 0th-order and ±1st-order-diffracted lights generated from the diffraction grating on the same track of the disc; and a photodetector to which reflected light of the 0th-order and ±1st-order-diffracted lights focused on an optical disc is applied through the objective lens, and which generates a differential-push-pull signal, a direction of a straight line connecting light-emitting points of the first and second laser lights in the laser-light source being inclined relative to the direction optically corresponding to the optical-disc-tracking direction in the diffraction grating.

REFERENCES:
patent: 7652246 (2010-01-01), Matsubara et al.
patent: 2006/0158996 (2006-07-01), Kim
patent: 2009/0129235 (2009-05-01), Yanagisawa et al.
patent: 2009/0147658 (2009-06-01), Katayama
patent: 2004-145915 (2004-05-01), None
patent: 2007-149249 (2007-06-01), None
patent: 2007-164962 (2007-06-01), None

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