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. 10, 1987
Filed:
Feb. 17, 1983
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A magnetic head assembly has, at least, a recording/reproducing magnetic head made of an Mn-Zn ferrite, a first reinforcer made of a non-magnetic ceramic material and bonded by a glass to the recording/reproducing magnetic head in parallel with the gap formed in the recording/reproducing magnetic head, erasing magnetic heads attached to both sides of the first reinforcer so as to limit the recording width of the recording/reproducing magnetic head, and second reinforcers made of a non-magnetic ceramic material and bonded in parallel to gaps in the erasing magnetic heads, the second reinforcers being positioned at both sides of said recording/reproducing magnetic head. The area Af defined by the thermal expansion coefficient curve of the Mn-Zn ferrite in the temperature range between the normal room temperature and the softening point of the bonding glass and the area Ac defined by the thermal expansion coefficient curve of the first reinforcer in the same temperature range satisfy the following condition: