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:
Jul. 22, 1986
Filed:
Feb. 28, 1983
Applicant:
Inventor:
Joseph T Castagna, San Jose, CA (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 13 ; 310 27 ; 336208 ;
Abstract
A coil for a voice coil actuator employed in a transducer positioning system of a disk file is disclosed in which the coil is constructed to minimize vibrations in a direction parallel to the coil axis which tend to occur as a result of rapidly energizing the coil during the seek and track following modes of the positioning system. The coil is characterized by a composite layer of viscoelastic material and aluminum foil disposed between the coil bobbin and the coil winding where the aluminum foil functions to increase the shear deformation of the viscoelastic material and its modulus of rigidity.