Method for recording/reproducing optical information recording m

Details Method for recording/reproducing optical information recording m Method for recording/reproducing optical information recording m

1997-10-17

2000-05-09

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369 58, 369 4414, 369 4412, G11B 700

Patent

active

060613246

ABSTRACT:
An optical pickup apparatus includes a light source for emitting a light flux; and a converging optical system having a first, second, and third divided surface, which are divided in the order named from the vicinity of an optical axis of the converging optical system, for converging the light flux emitted from the light source, wherein a beam spot passing through the first and third divided surfaces is formed onto a first optical information recording medium having a transparent substrate whose thickness is t1, and a beam spot passing through the first and second surfaces is formed onto a second optical information recording medium having a transparent substrate whose thickness is t2 that is more than t1. The optical pickup apparatus further includes an image sensor for receiving a light flux reflected from the first and/or second optical information recording medium.

REFERENCES:
patent: 5835283 (1998-11-01), Yamanaka

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