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:
Jun. 02, 2009
Filed:
Oct. 17, 2005
Hiroshi Fukui, Ibaraki, JP;
Yoji Maruyama, Saitama, JP;
Masafumi Mochizuki, Tokyo, JP;
Tomohiro Okada, Kanagawa, JP;
Hiroshi Fukui, Ibaraki, JP;
Yoji Maruyama, Saitama, JP;
Masafumi Mochizuki, Tokyo, JP;
Tomohiro Okada, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the invention provide a magnetic head (magnetic disk storage) which does not erase data on a recording medium even when a stray field is applied. In one embodiment, the head has a structure that d<tand d<tare satisfied where ddenotes the positional difference between edges of an auxiliary pole and an upper shield in the cross-track direction, ddenotes the positional difference between edges of the upper shield and a lower shield in the cross-track direction, tthe film thickness of the auxiliary pole or upper shield, whichever magnetic layer is larger in cross-track width, and tthe film thickness of the upper shield or lower shield, whichever magnetic layer is larger in cross-track width.