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. 15, 1999
Filed:
Apr. 04, 1996
Unitika Ltd., Hyogo, JP;
Abstract
A magnetic marker which comprises a flexible organic polymer substrate having an anisotropic thermal shrinking property and a soft magnetic thin film having uniaxial magnetic anisotropy. The angle formed between the direction in which the organic polymer substrate has the highest degree of thermal shrinkage and the direction of magnetic easy axis in the soft magnetic thin film is in the range from 50.degree. to 90.degree.. The marker is a thin film of a simple structure, yet exhibits satisfactory magnetic characteristics. A roll having a plurality of magnetic markers, each comprising an organic polymer substrate and a soft magnetic thin film formed transversely on the surface, can be manufactured by a process relying upon the combination of (i) a roll coater method and (ii) a sputtering technique. In the process, the organic polymer substrate is set and continuously transported such that the direction in which the organic polymer substrate experiences the highest degree of thermal shrinkage is not greater than 40.degree. with respect to the direction of its travel. Furthermore, the thickness of the soft magnetic thin film that is deposited per unit of the cathode as the result of a single pass of the organic polymer substrate over the cathode does not exceed 0.4 .mu.m. The process is capable of continuous production of magnetic markers having satisfactory magnetic characteristics and advantageously enables easy manufacture of a roll having a plurality of such magnetic markers arranged transversely thereon.