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:
Feb. 23, 2016
Filed:
Dec. 20, 2013
Hgst Netherlands B.v., Amsterdam, NL;
Supradeep Narayana, Santa Clara, CA (US);
HGST NETHERLANDS B.V., Amsterdam, NL;
Abstract
The present invention relates to stray magnetic shielding in PMR systems. The stray magnetic fields can funnel through the magnetic write head into the recording medium and lead to degradation in performance, even erasure. By placing a magnetic shield around the return pole, and spaced from the main pole by a nonmagnetic material, the stray magnetic flux is diverted into the additional stray field magnetic shields such that the stray magnetic fields travel mainly through the shield, away from the main pole. This ensures the stray magnetic flux density will be decreased greatly before reaching the recording medium, unable to negatively affect performance. To further ensure ease of manufacturing, the magnetic shield is made from the same material as the main pole, the return pole, or both.