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. 08, 2011
Filed:
Oct. 25, 2005
Atsushi Kato, Odawara, Kanagawa, JP;
Isao Nunokawa, Odawara-shi, Kanagawa, JP;
Tomohiro Okada, Odawara-shi, Kanagawa, JP;
Ichiro Oodake, Odawara, Kanagawa, JP;
Atsushi Kato, Odawara, Kanagawa, JP;
Isao Nunokawa, Odawara-shi, Kanagawa, JP;
Tomohiro Okada, Odawara-shi, Kanagawa, JP;
Ichiro Oodake, Odawara, Kanagawa, JP;
Other;
Abstract
The main magnetic pole piece of a magnetic head for perpendicular magnetic recording preferably has an inverted trapezoidal shape in order to maintain a sufficient recording magnetic field. Embodiments of the present invention enhance the covering power of the protective film around the main magnetic pole piece of the magnetic head and thereby ensure reliability even when the main magnetic pole piece has such a shape. In one embodiment, the protective film for protecting the main magnetic pole piece is formed by a sputtering apparatus while applying a bias, or it is formed by a carousel type sputtering apparatus or the chemical vapor deposition (CVD) technique.