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:
May. 27, 2008
Filed:
Mar. 17, 2005
Jeffry A. Leblanc, Aptos, CA (US);
Troy M. Herndon, San Jose, CA (US);
Mohammad M. Ameen, Cupertino, CA (US);
Raquib U. Khan, Pleasanton, CA (US);
Jeffry A. Leblanc, Aptos, CA (US);
Troy M. Herndon, San Jose, CA (US);
Mohammad M. Ameen, Cupertino, CA (US);
Raquib U. Khan, Pleasanton, CA (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
For motors having a journal with one or more groove regions and a shaft for relative rotation in the journal, aspects include providing a dual tapered shaft. The shaft may be tapered by the application of a wear resistant coating at least opposite the groove regions. The coating introduces a shaft taper from near a top end and from near a bottom end towards the shaft middle. The shaft taper may provide for improved pumping efficiency. The coating may be applied in various processes such as chemical vapor deposition or physical vapor deposition to establish a thickness gradient of coating material from near the top end and near the bottom end towards the shaft middle. In one example, the coating includes a DLC coating. Additionally, shaft portions may be shielded to prevent coatings thereon.