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:
Jun. 11, 1985
Filed:
Mar. 12, 1984
Thomas Mayer, Santa Rosa, CA (US);
Norman L Boling, Santa Rosa, CA (US);
James D Rancourt, Santa Rosa, CA (US);
Burroughs Corporation, Detroit, MI (US);
Abstract
An optical data storage system is contemplated, one employing a data-modulated writing laser beam and a nonerasing reading laser beam of predetermined wavelength. Improved optical media for such systems are described, these characterized by multiple layers whose optical characteristics and thickness are chosen to accommodate a prescribed writing and reading energy and wavelength and so provide an 'anti-friction' condition for unrecorded portions of the medium and a relatively higher reflectivity for recorded portions. A preferred optical medium includes a highly reflective aluminum layer, a relatively transparent polymer spacer layer overlying the reflective layer, and an optical absorber (recording) layer overlying the spacer layer. Overcoating structure is specified in some detail; e.g., as a 'soft pad' layer (e.g., fluoropolymer) on the absorber, with a 'Hard' layer (e.g., radiation-cured acrylic) laid over the 'soft pad' as an outer protective overcoat. Also, the 'spacer' may be rendered as such a 'soft pad'.