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:
Jun. 08, 1993
Filed:
Jun. 11, 1991
Toshiaki Wada, Takatsuki, JP;
Hideki Mine, Amagasaki, JP;
Junji Numazawa, Kawasaki, JP;
Naoto Hayashi, Zama, JP;
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Abstract
A thin film magnetic head for perpendicular magnetic recording includes a magnetic member lying on a wear-resistant substrate of a non-magnetic material and defining a return path for magnetic flux. The magnetic member has a main groove formed in one of its principal surfaces in parallel to a sliding surface adapted to face a magnetic recording medium, and a narrow groove formed in the same principal surface and crossing the main groove at right angles thereto. The main and narrow grooves are filled with a non-magnetic material. The magnetic member carries thereon a laminate formed immediately above the intersection of the main and narrow grooves, and consisting at least of a thin-film conductor coil, an interlayer insulating film, a main pole film and a head-protecting film which are formed one upon another. The narrow groove has a width which is larger than that of the main pole film. The magnetic member is connected to the main pole film through a via hole portion. The magnetic member and the laminate have an exposed surface defining the sliding surface, and the magnetic member is exposed in the vicinity of the main pole film.