Optical pickup apparatus and drive apparatus having the same

Details Optical pickup apparatus and drive apparatus having the same Optical pickup apparatus and drive apparatus having the same

2008-08-08

2010-10-05

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112230

Reexamination Certificate

active

07808878

ABSTRACT:
An optical pickup apparatus and a drive apparatus having the same are provided. Second light-receiving elements or third light-receiving elements for receiving ±first-order diffraction light beams from a polarization hologram are arranged outwardly of a circular region having the optical axis of a zero-order diffraction light beam on a light detector as its center, a radius of which is expressed by (2×t
)×(f2/f1), where f1denotes a focal length of an objective lens, f2denotes a focal length of a coupling lens, t denotes a maximum value of a light transmitting layer thickness, n denotes a refractive index of a light transmitting layer.

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