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. 02, 1985
Filed:
Dec. 13, 1982
Marshall D Rester, Anaheim, CA (US);
Quixote Corporation, Chicago, IL (US);
Abstract
A process for making a radiation-reflecting record carrier, such as a video disc, is provided on which video and/or audio information is stored in an optically readable track in which first reflective areas alternate with second reflective areas, the two reflective areas having different effects on a reading beam in a playback machine so that the information recorded on the carrier may be recovered. The second reflective areas serve to direct the reading beam away from the path along which it is reflected by the first reflective areas. The process uses photographic techniques to form a master negative or positive, and to form record carrier replicas from the master. In the disclosed embodiment of the method and apparatus of this invention, the second reflective areas of replica carrier are formed by raised crystalline deposits of a material such as silicon which are chemically deposited in a selected, optically generated pattern on the replica carrier.