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:
Sep. 10, 1991
Filed:
Mar. 19, 1990
Atsushi Toyoda, Hamamatsu, JP;
Shuichi Sawada, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A thin-film magnetic head is constructed by a lower core, a first insulating layer, a gap layer, a plurality of coil conductor layers, a plurality of insulating layers and an upper layer. The coil conductor layers are respectively embedded in the insulating layers. Each of the coil conductor layers is spirally formed on the gap layer, and the coil conductor layers are sequentially piled up on the gap layer. The gap layer is formed on the first insulating layer which coats and insulates the lower core. Then, an edge portion is formed by sandwiching the first insulating layer and the gap layer between the lower and upper cores. The first insulating layer whose shape affects the writing/reading efficiency of the thin-film magnetic head is protected by the gap layer. Preferably, the gap layer is formed by coating Al.sub.2 O.sub.3 film or SiO.sub.2 on the first insulating layer.