Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-11-21
1999-03-23
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 59, G11B 700
Patent
active
058869697
ABSTRACT:
An optical recording/reproducing method employs a recording laser beam having a first output and a first wavelength, and a reproducing laser beam having a second output lower than the first output and a second wavelength shorter than the first wavelength. A disk-like recording medium is irradiated with the recording and reproducing laser beams by use of an objective lens having an NA of about 0.55 so that a small mark equal to or smaller than about one fourth of a spot size optically defined from the wavelength of the recording laser beam and the NA of the objective lens is formed on the recording medium by a recording characteristic of the recording medium and a shielding plate provided in an optical system for irradiation with the laser beam. Two-dimensional recording is performed as a recording system to arrange marks at lattice points of a two-dimensional lattice which extend in a track direction and a track radius direction. The reproducing system detects a reproduction signal from the mark on the two-dimensional lattice point, and the reproduction signal from each mark is used to perform a signal processing, thereby detecting information.
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ECMA European Computer Manufacturers Association, "Standard ECMA-195", Date Intercharge on 130mm Optical Disk Cartridges-Capacity: 2 Gigabytes.
"Optical Components Replicated Optics", Philips Optics, Sep. 1994, pp. 1-28 .
Andoo Keikichi
Awano Hiroyuki
Komoda Osamu
Maeda Takeshi
Miyamoto Harukazu
Hitachi , Ltd.
Tran Thang V.
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