Magnetic shielding spring
AssigneeU.S. Philips Corporation
InventorsCarolus J. Boullart, Adrianus C. H. J. Liefkens
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Abstract
A magnetic tape cassette comprising a housing having an apertured wall to admit a magnetic head, tape guiding means, tape pressure means provided opposite to the aperture and a leaf spring adapted to press the tape pressure means against the tape when a magnetic tape is present in the cassette. The leaf spring consisting of one strip of a soft-magnetic metal alloy having an amorphous structure also serves as a magnetic shielding.
Claims12
A magnetic tape cassette comprising a housing having circumferential walls, one of said walls having an aperture for admitting a magnetic head connected to a magnetic tape apparatus, tape guiding means for guiding a magnetic tape present in the cassette past said aperture, tape pressure means disposed opposite said aperture, a leaf spring arranged to press the tape pressure means against the tape when a magnetic tape is present in the cassette, and means for magnetically shielding a region in the cassette adjacent said pressure means, characterized in that the leaf spring and the means for magnetically shielding together consist of a unitary element which is a strip of soft magnetic metal alloy having an amorphous structure.
A magnetic tape cassette comprising a housing having circumferential walls, one of said walls having an aperture for admitting a magnetic head connected to a magnetic tape apparatus, tape guiding means for guiding a magnetic tape present in the cassette past said aperture, and tape pressure and shielding means disposed opposite said aperture, said tape pressure and magnetic shielding means comprising a leaf spring, characterized in that the leaf spring provides the shielding function of the tape pressure and shielding means, and that the spring is a unitary element which consists of a strip of soft magnetic metal alloy having an amorphous structure and a composition defined by the formula:
- (Fe.sub.x Co.sub.1-x).sub.1-y (Si.sub.1-z B.sub.z).sub.y
- wherein
- 0.03<x<0.25;
- 0.1<y<0.3;
- 0.2<z<1.
A leaf spring for providing a biasing force and magnetic shielding, suitable for use in a magnetic tape cassette, consisting of one unitary strip of a soft magnetic metal alloy having an at least 80% amorphous structure.
A leaf spring suitable for use as a combined spring and shield in a magnetic tape cassette, characterized in that the spring consists of one unitary strip of a soft magnetic metal alloy having an amorphous structure and a composition defined by the formula:
- (Fe.sub.x Co.sub.1-x).sub.1-y (Si.sub.1-z B.sub.z).sub.y
- wherein
- 0.03<x<0.25;
- 0.1<y<0.3;
- 0.2<z<1.
Dependencies are inferred from the claim text.