Optical data recording medium and method of manufacturing the sa

Details Optical data recording medium and method of manufacturing the sa Optical data recording medium and method of manufacturing the sa

1990-07-09

1992-02-04

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428409, 4284111, 428426, 428433, 428457, 428913, 369272, 369288, 346762, 3461351, 430945, 156625, 427164, B32B 302

Patent

active

050859102

ABSTRACT:
Disclosed is an optical data recording medium provided with a glass substrate and a recording layer carried by the glass substrate, wherein the glass substrate is composed of a glass plate having a mixed layer of metallic tin or a tin compound formed on at least one surface thereof, a content of the metallic tin or tin compound on the surface of the glass substrate being regulated to 1.3 wt % or less and the entire surface of the glass plate being subject to a chemically reinforcing treatment, and also disclosed is a method of manufacturing an optical data recording medium provided with a glass substrate and a recording layer carried by the glass substrate, which comprises the steps of making a glass plate by a float method using melted metallic tin for the glass substrate, cutting the glass plate to a desired configuration and size, polishing at least one surface of the glass plate which is in contact with the melted metallic tin when making the glass plate to regulate a content of tin in the polished surface to 1.3 wt % or less, and subjecting the polished glass plate to a chemically reinforcing treatment.

REFERENCES:
CA 110 (12): 105111e, Optical recording Material, JP 63-160028, 7-2-88, TDK Corp.
CA 109 (2): 14881u, Antimony-germanium-Tin Alloy . . . , JP 62-246788, 10-27-87, Victor Co. of Japan Ltd.
Journal of Appl. Phys., vol. 62, No. 3, 8-1-87, pp. 1029-1034 Oxidation Resistance of Pb-Te-Se optical recording film, Moteyasu et al.

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