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. 22, 1987
Filed:
Nov. 20, 1985
Takashi Hatanai, Nagaoka, JP;
Keishi Nakashima, Nagaoka, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A magnetic head for perpendicular magnetic recording includes a pair of substrates consituted by a non-magnetic material and having their opposing surfaces respectively formed with heat-resistant polymer films. A thin magnetic film is retained between these substrates. Further, a non-magnetic intermediate film is interposed between the thin magnetic film and each of the polymer films. The intermediate film has a coefficient of thermal expansion which is close to that of the thin magnetic film. Accordingly, no internal stress is generated in the thin magnetic film which would otherwise be caused by thermal expansion and shrinkage in manufacture. Thus, it is possible for the magnetic head to possess sufficiently high wear resistance and excellent magnetic properties.