Optical recording medium and production process for the medium

Details Optical recording medium and production process for the medium Optical recording medium and production process for the medium

1990-07-30

1993-03-16

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430495, 430945, 369288, 3692752, 3461351, G03C 100, G11B 724, G11B 1112

Patent

active

051943638

ABSTRACT:
An optical information recording medium is provided in which the active layer is a phase change material capable of absorbing energy and being converted between a substantially amorphous state and a substantially crystalline state. The active layer contains nitrogen, which may be in the form of a nitride or nitrides of the constituent elements of the active layer, or may be a nitrided surface thereof. The inclusion of nitrogen inhibits localized shifting of the active material, which leads to degradation of the recording/erase properties of the medium. The optical recording medium includes a substrate, onto which is deposited in sequence a first dielectric layer, a nitrogen-containing active layer, a second dielectric layer, and a metallic reflecting layer. The second dielectric layer is made thin, so that the cooling rate of the active layer is increased to form a more uniform amorphous state.

REFERENCES:
patent: 4499178 (1985-02-01), Wada et al.
patent: 4670345 (1989-06-01), Morimoto et al.
patent: 4984231 (1991-01-01), Yasuoka et al.
patent: 5024910 (1991-06-01), Ohta et al.
patent: 5034255 (1991-07-01), Shigematsu et al.
Phase Change Disk Media Having Rapid Cooling Structure Technical paper by Ohta et al., published in the Japanese Journal of Applied Physics, vol. 28 (1989).
Million Cycle Overwritable Phase Change Optical Disk Media Technical paper by Ohta et al., presented at the SPIE vol. 1078 Optical Data Storage Topical Meeting, Jan. 17-19, 1989.

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