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...

2006-05-23

2006-05-23

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

C369S112010, C369S110020

Reexamination Certificate

active

07050380

ABSTRACT:
An optical pickup unit includes first and second light sources of first and second wavelengths, respectively, a dichroic 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 dichroic element, the phase plate, and the objective lens.

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