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:
Dec. 11, 1979
Filed:
May. 01, 1978
Applicant:
Inventors:
Arthur T Lippel, Los Angeles, CA (US);
John R Valvo, Los Angeles, CA (US);
Gerald B Smith, Huntington Beach, CA (US);
Assignee:
Lippel Cybersonics, Inc., Sun Valley, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
1791 / ; 1791 / ; 274 / ; 274 / ;
Abstract
The disc recording cutter head is carried on the inner end of an arm which is pivoted intermediate its ends. A counterbalance weight on the outer end of the arm exactly counterbalances the cutter head. A direct current torque motor mounted on the pivot axis applies cutting force to the cutting stylus. Additional features optionally include damping of arm motion by arm position feedback to the torque motor and control of the cutting force as a function of stereo program material.