Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1998-02-13
1999-10-12
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
428 646, 428913, 428912, 3692755, 3692752, 430945, G11B 726
Patent
active
059653230
ABSTRACT:
An improvement in production of an optical recording medium of phase change type is provided. In the present method, the step of repeated recording and erasing which had to be carried out after initialization and before shipment in the conventional process is eliminated. The optical recording medium produced by the present process retain good properties after repeated overwriting. In the process of the present invention, the prior art initialization step is replaced by modification treatment and the subsequent crystallization treatment. The modification treatment is a step wherein non-crystalline recording layer formed by sputtering is melted and cooled to change the crystal-lographic state into a non-crystalline state which is different from the non-crystalline state immediately after the formation of the recording layer. The crystallization treatment is a step conducted after the modification treatment wherein the recording layer in non-crystalline state is heated for crystallization.
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Yamada et al. "Rapid-phase transitions of Ge Te-Sb2Te3 . . . " J. Appl. Phys. 69(5) pp. 2849-2856, Mar. 1991.
Takahashi Makoto
Utsunomiya Hajime
Angebranndt Martin
Lasker R. J.
TDK Corporation
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