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:
Feb. 27, 1979
Filed:
Mar. 14, 1977
Lee V Hedlund, Cinnaminson, NJ (US);
Ronald P Fink, Marlton, NJ (US);
David I Wright, Riverton, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information, which can represent, for example, television video, x-ray, or digital data signals, are addressed by codes that identify the track on which the information is recored preceded by the address code. The recording mechanism can record a new track adjacent to the previous track if the disc has been moved between recordings. There are also means for compensating for eccentricity errors introduced by small changes in the radial dimensions of the disc. The spacing between tracks is typically 2.5 microns although the eccentricity errors may exceed the span of ten tracks. Typically, 4,000 tracks per cm can be recorded.