Optical information storing medium

Details Optical information storing medium Optical information storing medium

1989-03-09

1990-07-03

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428688, 428913, 430940, 430945, 346 76L, 3461351, 369284, 369288, B32B 302

Patent

active

049390139

ABSTRACT:
Optical information active layer mainly composed of a quaternary system of Te-Ge-Sn-Au, with composition ratios of Te, Ge and Sn that lie within an area represented by points A B C D and E on FIG. 1, with an additional amount of Au that is 1-40 atomic % of the quaternary system of Te-Ge-Sn-Au. The optical information active layer can be melted readily by a laser diode thereby achieving a high recording sensitivity, because it contains Te.sub.2 Au alloy having low melting point, CHR and erasability after repeated use and long term storage are small, and since excessive Te in the information active layer is stabilized by formings of Ge Te Su Te and Au Te.

REFERENCES:
patent: 3971874 (1976-07-01), Ohta
patent: 4388400 (1983-06-01), Takei et al.
patent: 4414273 (1983-11-01), Wada et al.
patent: 4477819 (1984-10-01), Lee et al.
patent: 4587209 (1986-05-01), Ohno et al.
patent: 4621032 (1986-11-01), deNeufville et al.
patent: 4656079 (1987-04-01), Yamada et al.
Chen et al., "Reversibility and Stability of Tellurium Alloys for Optical Storage Applications", Applied Physics Letters, vol. 46, No. 8, (Apr. 15, 1985).
SPIE vol. 695 Optical Mass Data Storage II (1986) pp. 79-85.

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