Optical pick-up apparatus and objective lens for the optical...

Details Optical pick-up apparatus and objective lens for the optical... Optical pick-up apparatus and objective lens for the optical...

2007-01-02

2007-01-02

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, C369S103000

Reexamination Certificate

active

10400655

ABSTRACT:
An optical pick-up apparatus has a first light source, a second light source, and an optical system including an objective lens. An optical functional surface of the objective lens is divided into at least first and second concentric optical functional regions. The second functional region is provided with a diffractive structure to correct a spherical aberration of a converged light spot on an information recording plane to be regulated in a range where reproduction and/or recording information for a first optical information recording medium can be conducted when the refractive index of the optical element and the wavelength of the first light source vary due to a change of the working temperature of the optical system.

REFERENCES:
patent: 6515955 (2003-02-01), Takeuchi
patent: 6594222 (2003-07-01), Maruyama
patent: 6751021 (2004-06-01), Hendriks et al.

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