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. 29, 1980
Filed:
Feb. 02, 1978
Applicant:
Inventors:
Keith D Ridler, Cambridge, GB;
Dexter R Plummer, Ongar, GB;
Assignee:
Streathern Audio Limited, Belfast, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
318558 ; 274 / ; 1791 / ; 318676 ;
Abstract
Apparatus for controlling the movement of a phonograph arm, pivoted for movement in horizontal and vertical planes, so as to maintain a desired stylus pressure. Displacement of the stylus resulting, for example, from passages of heavy modulation is used to generate electrical signals. A feedback system utilizes these signals to control the operation of horizontal and vertical rotational control devices.