Optical pickup and disk drive apparatus

Details Optical pickup and disk drive apparatus Optical pickup and disk drive apparatus

2004-09-20

2009-12-01

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044230, C369S112030

Reexamination Certificate

active

07626900

ABSTRACT:
In an optical pickup for irradiating a laser beam emitted from a photoemission element on a disk-like recording medium through an objective lens, there is provided a diffraction element including a first region for splitting the laser beam emitted from the photoemission element into a main beam and a pair of first sub-beams and a second region for splitting the laser into a main beam and a pair of second sub-beams, wherein a following relation hold or approximately hold: (2n−1)×P/2, where D is a distance between a spot center of the first sub-beam and a spot center of the second sub-beam, the spots being formed on a recording surface of the disk-like recording medium spaced in a substantially radial direction of the disk-like recording medium, n is a natural number, and P is a track pitch of the disk-like recording medium.

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patent: 7242648 (2007-07-01), Yamada et al.
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patent: 2002/0027844 (2002-03-01), Furuhata et al.
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patent: 2003-045051 (2003-02-01), None
JP 10-269587, Takahara Ikuo, Optical pickup device, Sep. 1998 (English Translation).

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