Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-03-07
1999-12-21
Hindi, Nabil
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 94, G11B 700
Patent
active
06005834&
ABSTRACT:
An optical recording medium recording and reproducing apparatus for recording information on an optical recording medium and/or reproducing information therefrom by irradiating the optical recording medium with laser light by the use of a two-group objective lens composed of at least first and second lenses. This apparatus is provided with: a light source for emitting laser light; a first lens for converging laser light emitted from the light source; a second lens interposed between the first lens and the optical recording medium; a detecting unit for detecting a kind of the recording medium; and a movement unit for changing the distance in the direction of an optical axis between the first and second lenses by causing a relative movement between the first and second lenses. Further, the distance between the first and second lenses is changed by the movement unit, which causes the second lens to move, according to a result of a detection, which is performed by the detecting unit. Thereby, the numerical aperture NA of the objective lens is increased. Moreover, the influence of aberration is mitigated. Consequently, the high-density recording and reproducing of information signals can be achieved.
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Fukumoto Atsushi
Ichimura Isao
Maeda Fumisada
Ohsato Kiyoshi
Watanabe Toshio
Hindi Nabil
Kananen Ronald P.
Sony Corporation
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