Reversible optical information-recording medium

Details Reversible optical information-recording medium Reversible optical information-recording medium

1993-04-28

1994-01-11

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Erasable imaging

430346, 430348, 430495, 430945, 3461351, 346 76L, G03C 172, G11B 724

Patent

active

052780112

ABSTRACT:
Phase-change type, reversible optical information recording medium, being possible for recording, reproducing, erasing, and rewriting of information, by use of a laser beam. This invention consists of recording thin film of ternary elements, for example, containing Ge, Te, Sb/or Bi or quaternary elements containing the fourth element of Se with which a part of Te is replaced, which is established on such surface-flat substrates as glass or plastics. In this case, the component ratio of Te and Se is selected not to be excess for other elements, such as Ge, Sb/or Bi so as to be fixed as stable compounds of stoichiometric compositions of GeTe, Sb.sub.2 Te.sub.3 /or Bi.sub.2 Te.sub.3, or GeSe, Sb.sub.2 Se.sub.3 /Bi.sub.2 Se.sub.3 when crystallized. Strictly speaking, a concentration of each component is selected to have proper ratio of the number of atomes each other so as to represent whole composition as the sum of each component. By this treatment, it is possible to have high crystallization speed and long cyclability of recording/erasing. The effect of Se is to increase the viscosity of the system and to make easily to obtain amorphous state; and moreover, by selecting of proper amount displaced with Te, it is possible to obtain the composition of recoding film superior in both characteristics of recording (amorphization) and erasing (crystallization).

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Yamada et al., SPIE vol. 695, pp. 76-85, 1986 Te-Ge-Sn-Au Phase Change Recording Film for Optical Disk.
Bardas et al., Thermochimica Acta, 107 (1986) 239-265 Phase Diagram of the Ternary System Ge-Sb-Te. II. The Subternary Ge-Ge-Te-Sb.sub.2 Te.sub.3 -Sb.
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