Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-02-06
2000-08-15
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 4423, G11B 700
Patent
active
061046884
ABSTRACT:
An objective lens, a reproducing apparatus and a reproducing method using a single objective lens for a DVD which can also read a CD without adding any peripheral member can be obtained. In an objective lens which is arranged so that a light beam emitted form a common light source (11) may be focused through a common objective lens (8) on respective signal recorded surfaces (1a), (2a) of a DVD (2) and a CD (1) having light transmitting layers (1c), (2c) of different thicknesses, an area of the objective lens (8) for the DVD (2) in a range of a numerical aperture NA from 0 to 0.3-0.4 from the light axis is worked to form correcting lens surface 8a for correcting the aberration caused when reading the CD (1) through the objective lens for the DVD (2), thereby allowing the CD to be read through the objective lens for the DVD.
REFERENCES:
patent: 5867468 (1999-02-01), Mori et al.
patent: 5933401 (1999-08-01), Lee et al.
Kikuchi Nobuyasu
Yamakawa Akio
Edun Muhammad
Kananen Ronald P.
Sony Corporation
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