Method of producing optical recording medium
Patent 4659588 Issued on April 21, 1987. Estimated Expiration Date: 
June 26, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 26, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOptical information storage material and method of making it Optical information recording material and method of recording and reproducing information using same material Method of making an optical memory disk and a product thereby Patent #: 4357366 InventorsAssigneeApplicationNo. 06/624571 filed on 06/26/1984US Classes:427/567, Silicon or metal oxide coating (e.g., glass, etc.)427/162, OPTICAL ELEMENT PRODUCED427/164, Transparent base427/166, Vapor depositing427/248.1, COATING BY VAPOR, GAS, OR SMOKE427/255.18, Silicon containing coating427/255.37, Silicon dioxide coating427/561Pretreatment of coating supply or source outside of primary deposition zone or off siteExaminersPrimary: Childs, Sadie L.International ClassesC23C 14/08 (20060101)C23C 14/24 (20060101) G11B 7/24 (20060101) G11B 7/243 (20060101) Foreign Application Priority Data1983-06-27 JPAbstractThe present invention relates to a method of producing an optical recording medium containing a thin film photosensitive layer provided on a board. When subjected to an optical energy, the optical density of this thin film photosensitive layer varies. Such optical recording medium is formed by the method of (a) mixing tellurium dioxide TeO2 and a reducing substance or substances, (b) heating the obtained mixture and causing part of the TeO2 to react with the reducing substance to obtain a sintered body and (c) obtaining a TeO2 compound thin film photosensitive layer on a board by evaporation and deposition, using the sintered body obtained in steps (a) and (b) as the vacuum deposition source. The optical recording medium possessing such a TeO2 compound thin film photosensitive layer may be used as both a one-time recording type medium and as an erasable type medium, capable of erasing the previously recorded information and recording new information in its place.Other References
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