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. 21, 2012
Filed:
Nov. 30, 2009
Hisayoshi Watanabe, Tokyo, JP;
Masachika Hashino, Tokyo, JP;
Michitoshi Tsuchiya, Tokyo, JP;
Koichi Otani, Tokyo, JP;
Tatsuhiro Nojima, Tokyo, JP;
Tsutomu Nishinaga, Tokyo, JP;
Hideyuki Ukita, Tokyo, JP;
Hisayoshi Watanabe, Tokyo, JP;
Masachika Hashino, Tokyo, JP;
Michitoshi Tsuchiya, Tokyo, JP;
Koichi Otani, Tokyo, JP;
Tatsuhiro Nojima, Tokyo, JP;
Tsutomu Nishinaga, Tokyo, JP;
Hideyuki Ukita, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A manufacturing method for a magnetic head includes the steps of: forming a structure on a lower shield, the structure including a lower gap, a main magnetic pole and first and second side gaps; forming first and second side shields; forming an upper gap; and forming an upper shield. In the step of forming the structure, an initial lower gap layer is formed on the lower shield, the initial lower gap layer including a pre-lower-gap portion, and two to-be-removed portions that are located on opposite sides of the pre-lower-gap portion. Then, a protrusion including the main magnetic pole and the first and second side gaps is formed on the pre-lower-gap portion. With the top surface of the protrusion covered with a mask, the initial lower gap layer is etched in part to thereby form the lower gap.