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:
Mar. 07, 2000
Filed:
Dec. 17, 1997
Matahiro Komuro, Hitachi, JP;
Tomohiro Okada, Hitachi, JP;
Masaaki Sano, Hitachi, JP;
Moriaki Fuyama, Hitachi, JP;
Hiroshi Fukui, Hitachi, JP;
Katsumi Hoshino, Hitachi, JP;
Takashi Kawabe, Hitachi, JP;
Yohji Maruyama, Iruma, JP;
Atsushi Nakamura, Hachioji, JP;
Miki Hara, Kokubunji, JP;
Noboru Shimizu, Tokorozawa, JP;
Noboru Yoshida, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to prevent degradation of the recording performance during radio frequency recording, and to provide a thin film magnetic head and a recording reproducing sectional pattern magnetic head which has a magnetic pole width less than 2 .mu.m and an ultra high density magnetic storage apparatus of 10 Gb/ in.sup.2 grade, a recording head is provided in which a lower part magnetic film serves as a shielding film of a reproducing selection, a non magnetic gap film is formed during formation of the upper part magnetic film and the lower part magnetic film, one part of the lower part magnetic film or the upper part magnetic film has a higher resistivity of more than 80 .mu..OMEGA.cm than other parts, the upper part magnetic film is formed by flame galvanizing, and a gap section of the lower part magnetic film or the upper part magnetic film has a convex shape.