Optical pick-up apparatus achieving high numerical aperture,...

Details Optical pick-up apparatus achieving high numerical aperture,... Optical pick-up apparatus achieving high numerical aperture,...

2006-05-09

2006-05-09

Patel, Gautam R. (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S094000, C369S044370

Reexamination Certificate

active

07042826

ABSTRACT:
An optical pickup apparatus for recording and/or reproducing information for an optical information recording medium having a plurality of information recording layers, comprising: a light source to emit a light flux; and a converging optical system to converge the light flux emitted from the light source onto each information recording layer of the plurality of information recording layers. The converging optical system converges a light flux having an image side-numerical aperture of 1.0 or more onto the each information recording layer so as to conduct recording and/or reproducing information for the each information recording layer.

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