Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

2005-05-02

2008-10-21

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07440381

ABSTRACT:
An optical pickup apparatus for conducting recording and/or reproducing information of an optical information recording medium, comprises a light source; a converging optical system having an objective lens; and a photo-detector. The converging optical system comprises a plastic lens and a spherical aberration deviation correcting element to correct deviation of a spherical aberration of the converging optical system. A numerical aperature of the objective lens at an image-side is 0.65 or more.

REFERENCES:
patent: 6192022 (2001-02-01), Hendriks et al.

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