Apparatus for reproducing optical information contained disks of

Details Apparatus for reproducing optical information contained disks of Apparatus for reproducing optical information contained disks of

1996-05-21

1997-08-19

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369112, 369121, G11B 700, G11B 7125

Patent

active

056595344

ABSTRACT:
An apparatus is disclosed that reproduces data recorded on a recording medium having a plurality of pits formed in the medium that stores the data. The medium is designed to be compatible with an information reproducing apparatus having a lens with a first numerical aperture NA1 for focusing a laser beam of a first wavelength .lambda.1 on the recording medium. The apparatus of the present invention comprises a laser generator for generating a laser beam of a second wavelength .lambda.2 and a lens having a second numerical aperture NA2 for focusing the laser beam from the laser generator. The second wavelength .lambda.2 of the laser beam and the second numerical aperture NA2 of the lens are set to satisfy the relationship: (.lambda.2/NA2)<(.lambda.1/NA1).

REFERENCES:
patent: 5016252 (1991-05-01), Hamada
patent: 5379288 (1995-01-01), Maeda
Terasaki et al., "Study of High Density CD-ROM Visible Laser Pick-up", Sep. 5-8, 1993.
Fine Optical Video Disc System Specification, Prepared in Sep., 1991, revised in Jan., 1993 and Jul., 1993 by Sanyo Electric Co., Ltd. Sony Co., Ltd., Toshiba Co., Ltd, Pioneer Co., Ltd and Matsushita Denki Sangyo Co., Ltd., cover sheet and p. 12.

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