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
1988-09-28
1991-04-16
Hamilton, Cynthia
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430321, 430323, 430325, 156643, 1566591, 156663, 428167, 428156, 428 64, 501 66, 501 52, 501 61, 501 62, 3461351, 346134, 369279, G03F 709, G03C 1765
Patent
active
050081764
ABSTRACT:
An information recording disk for recording an information signal along a track defined by a depression on the disk as a change of physical property of a recording material deposited on the track comprises a disk-shaped glass substrate made of a glass and carries a groove corresponding to the track. The groove has a surface roughness substantially smaller as compared to the surface roughness caused at a bottom surface of a groove on a silica glass substrate when both the disk-shaped glass substrate and silica glass substrate are dry-etched under same conditions. The disk-shaped glass substrate comprises SiO.sub.2 component and one or both of Al.sub.2 O.sub.3 and BaO components with substantially no alkali components. Further, a recording layer comprised of the recording material which changes in physical property responsive to a projected energy beam is deposited on the substrate such that the depression is formed in correspondence with the track.
REFERENCES:
patent: 4818648 (1989-04-01), Ohta et al.
L. L. Hench et al, "Physical Chemistry of Glass Surfaces", Journal of Non-Crystalline Solids, vol. 28, 1978, pp. 83-105.
Kawai Noboru
Kondo Tetsuya
Hamilton Cynthia
Meller Michael N.
Victor Company of Japan Ltd.
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