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:
Apr. 11, 1995
Filed:
Jul. 25, 1991
Bryan K Clark, Sunnyvale, CA (US);
Stephen D Pacetti, Sunnyvale, CA (US);
Other;
Abstract
Write-once and erasable recording media (1) and a method of manufacturing such media. According to one aspect of the invention, one or more active layers (26, 30) of the optical data storage medium is formed by spin-on techniques. According to this aspect of the invention, the material used in forming the active layer is formed before the formation of the center aperture (4) in the optical disc. This aspect of the invention provides a substantially smaller 'wedge' than prior methods. According to one preferred aspect of the invention, tracking grooves (24) in a flexible sheet (22) are bonded to a substantially rigid substrate (18). The sheet is bound to the substrate such that the tracking marks are directed away from the substrate. The active layers of an optical recording media are then formed on the sheet by, for example, spin-on techniques.