Phase-change optical disc recording method and apparatus, and in

Details Phase-change optical disc recording method and apparatus, and in Phase-change optical disc recording method and apparatus, and in

1995-09-26

1997-07-15

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, 369124, 372 33, G11B 700

Patent

active

056489528

ABSTRACT:
A trial writing operation is performed on a phase-change optical disc using write and erase light-emitting powers, which together are varied according to predetermined variation ratios respectively. Signals relevant to said trial writing operation are reproduced from said disc. Optimum ones of the write and erase light-emitting powers are determined using the thus-reproduced signals. The predetermined variation ratios for the write and erase light-emitting powers may be the same as each other. Alternatively, the trial writing operation may be performed on a phase-change optical disc using write and erase light-emitting powers which are individually varied according to predetermined variation ratios respectively.

REFERENCES:
patent: 5036519 (1991-07-01), Ema et al.
patent: 5043971 (1991-08-01), Van et al.
patent: 5128921 (1992-07-01), Van et al.

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