Optical disk and optical disk system with numerical aperture of

Details Optical disk and optical disk system with numerical aperture of Optical disk and optical disk system with numerical aperture of

1997-09-12

1999-06-08

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692752, 369283, G11B 1100

Patent

active

059109327

ABSTRACT:
An optical disc system uses a rewritable optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The recording layer is formed of a phase-change material. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.

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H. Iwasaki et al., "Completely Erasable Phase Change Optical Disc II: Application of Ag-In-Sb-Te Mixed-Phase System for Rewritable Compact Disc Compatible with CD-Velocity and Couble CD-Velocity," Jpn. J. Appl. Phys., vol. 21, pp. 5241-5247, Nov. 1993.
"Phase Change Media" in The CD-ROM and Optical Disc Recording Systems by E.W. Williams, Oxford University Press, pp. 140-149, 1994 (no month available).

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