The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1983
Filed:
Oct. 21, 1980
Michael Ettenberg, Freehold, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
An improved overcoated optical recording medium comprises a light absorptive layer and an overcoat overlying the absorptive layer wherein the overcoat has a plurality of indentations in the surface which contacts the absorptive layer thereby forming a first region of the recording medium wherein the overcoat layer does not contact the absorptive layer and a second region wherein the overcoat layer does contact the absorptive layer. The recording sensitivity in the first region is greater since the heat loss to the overcoat layer in these regions is reduced and the mechanical constraints on the formation of deformations in the absorptive layer are relaxed. The invention also includes an improved information record having information recorded in a portion of the first region as a change in the local optical properties.