Optical information recording medium

Details Optical information recording medium Optical information recording medium

1993-06-17

1995-04-25

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692752, 369288, G11B 370

Patent

active

054105340

ABSTRACT:
In an optical recording medium having concave and convex type signal pits formed on a substrate surface, a reflection layer is formed on the signal pits in such a manner that a reflection index of an interior of the signal pits is higher than a reflection index at a periphery of the signal pits with respect to a given reproduction laser beam wavelength. In an optical recording medium having a phase change recording layer which reversibly changes optical states upon application of laser energy, a structural phase difference between a reflection beam of non-recorded regions and a reflection beam of recorded regions of the optical recording medium with respect to the wavelength of a reproduction laser beam is in a range of (0.5-1.5)+2 n.pi. radians, where n is an integer. The phase change recording layer has principle components of Ge-Sb-Te or Sb-Se.

REFERENCES:
patent: 4216501 (1980-08-01), Bell
patent: 5130971 (1992-07-01), Ohno et al.
patent: 5294523 (1994-03-01), Nagata et al.
Patent Abstracts of Japan; vol. 10, No. 180 (P-471) Jun. 24, 1986.
Patent Abstracts of Japan; vol. 17, No. 127 (P-1502) Mar. 17, 1993.

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