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. 02, 1981
Filed:
Jul. 26, 1979
Joachim Greiner, Ebenhausen, DE;
Albrecht Mager, Rodenbach, DE;
Vacuumschmelze GmbH, Hanau, DE;
Abstract
A flexible and resilient, magnetic shielding element fabricated out of a soft magnetic alloy is provided. This shielding element not only provides magnetic shielding, but also may be used to provide a biasing force. Thus, for example, when a magnetic head is inserted into a tape cassette, a shielding element, as provided by this invention and positioned adjacent to the magnetic head opening of the cassette and on the other side of the magnetic tape from the tape head, both shields the tape head and biases the tape against the head to afford intimate contact with the tape head. Alloys which manifest a static coercive field intensity of less than 200 mA/cm, a relative static permeability, (measured as the continuous or d.c. field permeability at 4 mA/cm), of at least 2000, a Vickers hardness of at least 180, and an elastic limit of at least 500 N/mm.sup.2 are appropriate. Crystalline as well as amorphous, soft magnetic alloys are suitable.