Wave plate, optical pickup and optical disc apparatus

Details Wave plate, optical pickup and optical disc apparatus Wave plate, optical pickup and optical disc apparatus

2011-07-26

2011-07-26

Tran, Thang (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112220, C369S044370

Reexamination Certificate

active

07986607

ABSTRACT:
An optical pickup includes a wave plate on an optical path to be followed by every light beam emitted from three light sources (with wavelengths λ1, λ2and λ3, respectively) both on their way toward an optical disc and back from the disc toward a photodetector. The wave plate has two layers with different retardations and different optic axis directions. The sum of the retardations of the first and second layers is defined to be approximately5/4λ1,3/4λ2and1/2λ3to the light beams with the wavelengths λ1, λ2and λ3.

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