Optical disc recording/reproduction apparatus and method

Details Optical disc recording/reproduction apparatus and method Optical disc recording/reproduction apparatus and method

1997-12-19

2000-03-21

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4414, G11B 700

Patent

active

060410310

ABSTRACT:
An optical disc recording/reproduction apparatus for recording and/or reproducing a data by applying a beam from an optical head unit through a substrate onto/from a recording layer of the optical disc through, wherein the substrate of the optical disc is 0.3 mm or below; the optical head unit comprises: an objective lens for converging an incident beam and emitting the beam toward the optical disc; a forward lens for converging the beam introduced through the objective lens and applying the beam to the optical disc; a lens holder where the objective lens and the forward lens are fixed; and an actuator for driving the objective lens and the forward lens as a unitary block and controlling at least focusing, the objective lens and the forward lens having a total numerical aperture of 0.8 or above.

REFERENCES:
patent: 5764613 (1998-06-01), Yamamoto et al.
patent: 5881042 (1999-03-01), Knight
patent: 5946282 (1999-08-01), Hirono et al.

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