Optical pickup device and optical disk apparatus using the same

Details Optical pickup device and optical disk apparatus using the same Optical pickup device and optical disk apparatus using the same

2007-08-09

2010-11-02

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

07826328

ABSTRACT:
An optical pickup device includes: a light source that emits a light beam; a divergence-angle converting lens that converts an angle of divergence of the light beam emitted from the light source and emits the light beam; and an object lens displaceable in a tracking direction that receives incidence of the light beam, the angle of divergence of which is converted by the divergence-angle converting lens, and converges and emits the light beam, wherein spherical aberration equivalent to an amount that can offset astigmatism caused when the object lens is displaced is given to the divergence-angle converting leans, and spherical aberration that can offset the spherical aberration given to the divergence-angle converting leans is given to the object lens and comatic aberration that can offset comatic aberration caused by the spherical aberration given to the divergence-angle converting lens when the object lens is displaced is given to the object lens.

REFERENCES:
patent: 5684641 (1997-11-01), Tanaka et al.
patent: 2004/0150892 (2004-08-01), Takeuchi et al.
patent: 2004-247034 (2004-09-01), None

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