Optical pickup device

Details Optical pickup device Optical pickup device

1996-09-06

1999-05-25

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369120, G11B 700

Patent

active

059075309

ABSTRACT:
An optical pickup device which is capable of reproducing and recording information from at least two discs having different thicknesses includes a light source, an objective lens provided along the light path from the light source facing the plane of a disc and having a predetermined effective diameter, a beam splitter provided between the objective lens and the light source, a photodetector for detecting the beam split from the light splitter and reflected from the disc, and light controller provided along the light path facing the photodetector lens for controlling the light of the intermediate region between near- and far axis regions of an incident light beam. The optical pickup device is simplified and the manufacturing cost therefor is low. Also, by reducing the spherical aberration effect for the light, discs having different thicknesses can be used in a single disc drive.

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Patent Abstracts of Japan, vol. 095, No. 001, Feb. 28, 1995 & JP 06 295467 A (Nippon Columbia Co Ltd), Oct. 21, 1994. (English Abstract)

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