Optical recording medium

Details Optical recording medium Optical recording medium

1998-05-27

2000-02-01

Edun, Muhammad

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692754, 369100, G11B 700

Patent

active

060211091

ABSTRACT:
An optical recording medium having a recording layer with grooves that define recording tracks. The structure of unwritten tracks enable a scanning device to derive a radial tracking error signal using the push-pull method. The structure of the written tracks enable the scanning device to derive a radial tracking error signal using the high-frequency phase-detection method. The width of the groove is in the range from 0.3 to 0.6 time the wavelength over the numerical aperture for scanning the recording medium. The depth of the groove is in the range from 1/24 to 1/7 times the wavelength for scanning the recording medium. The phase difference between a radiation beam reflected from a track at a mark and a radiation beam reflected from that track in a region between written marks is in the range from 0.4 to 2.0 radians.

REFERENCES:
patent: 4057833 (1977-11-01), Braat
patent: 5493561 (1996-02-01), Nishiuchi et al.
patent: 5871881 (1999-02-01), Nishida et al.
patent: 5878022 (1999-03-01), Okada et al.

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