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. 21, 1984
Filed:
Dec. 14, 1981
George H Riddle, Princeton, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A cutting stylus is positioned with respect to a metal substrate in order to cut a groove. The cutting stylus is vibrated about a quiescent position in response to a relatively high frequency signal while cutting the groove in order to cut an information track comprising short wavelength modulation of the groove depth. Relative motion is established between the metal substrate and the cutting stylus such that the information track is cut along a spiral path. The relative motion is varied in a predetermined manner as the stylus cuts across the surface of the metal substrate such that the spiral information track is formed having a varying pitch to reduce the formation of damaging ridges on the cutting edge of the stylus.