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:
Jan. 08, 1980
Filed:
May. 15, 1978
Adam N Rosenberg, Stanford, CA (US);
Other;
Abstract
An articulated phonograph tonearm includes a multipivot parallelogram linkage means for supporting the phonograph cartridge. The linkage means is mounted at one end of a rigid beam. The beam is constrained to move in a plane parallel to the surface of the record and the parallelogram linkage structure forces the cartridge to remain in the same plane as it moves over warps. A stylus is attached to the cartridge and is adapted to ride in the grooves of the record. The stylus rotates about a virtual center which is preferably located on the surface of the record. Several alternative linkage structures are also disclosed. The apparatus is especially effective in minimizing the undesirable effects associated with record warp.