Optical element, optical pickup unit, and optical disk drive...

Details Optical element, optical pickup unit, and optical disk drive... Optical element, optical pickup unit, and optical disk drive...

2007-02-16

2008-11-25

Spector, David N (Department: 2873)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C359S634000

Reexamination Certificate

active

07457222

ABSTRACT:
An optical pickup unit includes first and second light sources of first and second wavelengths, respectively, a diachronic element, a phase plate, and an objective lens. One of the first and second light sources is selected so that information recording or reproduction is performed by converging a light beam emitted from the selected one of the first and second light sources on an optical recording medium via the diachronic element, the phase plate, and the objective lens.

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