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, 1989
Filed:
Mar. 10, 1987
Applicant:
Inventors:
Keishi Nakashima, Nagaoka, JP;
Naohiro Ishibashi, Yoita, JP;
Assignee:
Alps Electric Co., Ltd., , JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360126 ;
Abstract
A thin film magnetic head for use in the vertical magnetic recording having a main magnetic pole for carrying out recording and reproduction on and from a recording medium, and an auxiliary magnetic pole for cooperating with the main magnetic pole to form a closed magnetic circuit wherein the dimension of the auxiliary magnetic pole is made larger than that of the main magnetic pole at its end facing the recording medium and in their tracking direction to enhance reproduction efficiency.