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. 06, 2014
Filed:
Dec. 03, 2008
Mao Nishiyama, Kanagawa, JP;
Shuji Nishida, Kanagawa, JP;
Hideaki Maeda, Kanagawa, JP;
Masafumi Mochizuki, Kanagawa-ken, JP;
Mao Nishiyama, Kanagawa, JP;
Shuji Nishida, Kanagawa, JP;
Hideaki Maeda, Kanagawa, JP;
Masafumi Mochizuki, Kanagawa-ken, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the present invention provide a magnetic head for perpendicular magnetic recording, and a magnetic disk apparatus capable of preventing data erasure caused by alignment marks. In an embodiment, the magnetic head includes a head element including at least a main pole having a pole face on a flying surface and an auxiliary pole; alignment marks made of a magnetic material and used to detect the amount of lapping work when lapping the pole face of the main pole; and members made of a magnetic material, continuously extending in either direction with respect to the position of the main pole from within the alignment marks outward at least beyond the alignment marks.