Optical pickup device and optical disk device

Details Optical pickup device and optical disk device Optical pickup device and optical disk device

2008-02-15

2010-10-26

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010

Reexamination Certificate

active

07821905

ABSTRACT:
An optical pickup device is disclosed. The device includes: a light source that emits a light beam of a predetermined wavelength of about 405 nm; an objective lens being a plastic lens provided with, on at least one surface, diffraction means of a zone diffractive structure suppressing generation of aberration to be caused by a temperature change, and has a numerical aperture of 0.82 or larger for gathering the light beam emitted from the light source with respect to an optical disk; and a collimator lens disposed between the light source and the objective lens, and derives a substantially-collimated light by converting an angle of divergence of the light beam emitted from the light source.

REFERENCES:
patent: 2003/0026190 (2003-02-01), Hendriks et al.
patent: 2006-309903 (2006-11-01), None

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