Optical head device and objective lens

Details Optical head device and objective lens Optical head device and objective lens

2006-04-11

2006-04-11

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080, C369S112120

Reexamination Certificate

active

07027377

ABSTRACT:
An optical head device that converges first and second laser beams having different wavelengths on recording surfaces of first and second optical recording media through a single light converging optical system including an objective lens for recording or reproducing data on the recording surfaces. A refracting surface of the objective lens is divided into two regions, i.e., a central refracting surface region with an optical axis thereof being as a center and an outer circumferential refracting surface region that surrounds an outer circumference of the central refracting surface region. A diffraction grating is formed generally entirely over the central refracting surface region. When recording or reproducing data on the first optical recording medium using the first laser beam, a beam spot is formed with a diffracted beam obtained by the central refracting surface region. When recording or reproducing data on the second optical recording medium using the second laser beam, a beam spot is formed with a beam portion that passes the outer circumferential refracting surface region and a diffracted beam obtained by the central refracting surface region.

REFERENCES:
patent: 5883873 (1999-03-01), Morita
patent: 6313956 (2001-11-01), Saito
patent: 09-179020 (1997-07-01), None
patent: 2000-028917 (2000-01-01), None

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