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:
Mar. 12, 1991
Filed:
Nov. 13, 1989
Jeffrey S McAllister, Boise, ID (US);
Steven M Johnson, Eagle, bothof, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A disk drive in which the rotatable magnetic memory disks and the metal actuator are electrically isolated from the metallic mainframe of the disk drive and the magnetic heads on the metallic actuator, the coils of the magnetic heads and the magnetic memory disks are maintained at electrical potential levels which are sufficiently close to prevent arcing therebetween and which is different from the potential of the main frame. Electrical isolation is achieved by electrically insulating the disk spindle on which the disks are journaled from the mainframe and by electrically insulating the metal actuator from the metal actuator support when the metal actuator support is attached directly to the main frame, or by electrically insulating the metal actuator support from the main frame. An electrical potential is applied to the disks via the disk spindle and to the body of the magnetic heads via the metal actuator arm to provide potential levels which among these parts are sufficiently close to prevent arcing.