Optical information recording method

Details Optical information recording method Optical information recording method

1992-08-31

1994-02-22

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, G11B 700

Patent

active

052894533

ABSTRACT:
An optical information recording method in which a digital signal subjected to pulse width modulation is overwritten, by using one laser spot, on an optical disk including a first dielectric film, a recording film, a second dielectric film and a reflecting film stacked on a substrate in this order; the recording film having composition defined by a formula Ge.sub.x Sb.sub.y Te.sub.z satisfying 45.ltoreq.z.ltoreq.55.5, 0.5.ltoreq.y/(x+y).ltoreq.0.72 and x+y+z=100; the recording film having a thickness of 10 to 35 nm; the second dielectric film having a thickness of 5 to 40 nm; the reflecting film having a thickness of 35 nm or more; the optical information recording method comprising the steps of: converting each of a plurality of pulses contained in the digital signal, into a pulse train composed of pulses; and modulating a laser power between an erasing level and a recording level so as to overwrite the digital signal on the optical disk.

REFERENCES:
patent: 5084857 (1992-01-01), Miyauchi et al.
patent: 5109373 (1992-04-01), Ohno et al.

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