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:
Apr. 30, 2002
Filed:
Sep. 29, 1998
Makoto Yoshida, Saku, JP;
Noboru Yamanaka, Saku, JP;
Koichi Terunuma, Hohya, JP;
Yasufumi Uno, Nagano, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention relates to a thin film magnetic head which eliminates the problems of degradation in the recording magnetic field pitch and recording bleed occurring due to leaked magnetic field by preventing magnetic saturation from occurring at pole tips. A write element is provided with a first pole portion, a second pole portion and a gap film. The gap film is provided between the first pole portion and the second pole portion. The second pole portion includes a third magnetic film and a fourth magnetic film. The third magnetic film is adjacent to the gap film and the fourth magnetic film is adjacent to the third magnetic film. The third magnetic film has a width W at a position receding from its surface facing opposite the medium by a receding quantity &Dgr;L, which is larger than the width W at the surface facing opposite the medium.