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:
Nov. 10, 1992
Filed:
Apr. 29, 1991
Hideji Takahashi, Mouka, JP;
Ryo Goto, Mouka, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A composite magnetic head comprises a pair of magnetic core pieces made of an oxide-type magnetic material and bonded to each other for constituting a main magnetic circuit via a magnetic gap therebetween, and a thin, magnetic metal layer formed on a magnetic gap-opposing surface of at least one of the pair of magnetic core pieces for constituting an auxiliary magnetic circuit. The thin, magnetic metal layer has a columnar crystal structure in which the orientations of columnar crystals are substantially in perpendicular to the magnetic gap-opposing surface, and a ratio of diameter to length of each columnar crystal is substantially 0.5 or less. The reverse taper angles of the columnar crystals are preferably 0.degree.-10.degree. to suppress noises, reverse taper angles of the columnar crystals being 0.degree.-10.degree..