Optical pick-up device and objective lens used therein

Details Optical pick-up device and objective lens used therein Optical pick-up device and objective lens used therein

2006-07-11

2006-07-11

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112040, C369S112010, C369S112230, C369S044230

Reexamination Certificate

active

07075880

ABSTRACT:
An optical pickup apparatus conducts recording or reproducing information for an information recording plane of a first or second optical information recording medium and comprises a first light source and a second light source mounted on a same base board; a converging optical system; and a coupling lens. The converging optical system comprises an objective lens to converge a first or second light flux having passed through the coupling lens on a first or second optical information recording medium; and a diffractive structure to change a focal length in accordance with a wavelength of a light flux emitted from the first light source or the second light source.

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Search Report dated Mar. 3, 2006, from the European Patent Office in EP Application No. 02 25 3384.
Nakajima, “Oprical Pickup” Patent Abstracts of Japan of JP 10106016 dated Apr. 24, 1998.

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