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US 4,180,835 AGranted
Magnetic erasing head with gaps utilizing high flux density and high permeability
AssigneeSony Corporation
InventorsHaruhiko Okumura, Masanori Kanaya
Life of this patent
Estimating the term…
Abstract
In a magnetic erasing head having a first gap and a second gap formed respectively between ferrite cores, one or more magnetic material layers (Fe-layers) are arranged in the gaps respectively, and the magnetic material layers have the magnetic flux density (B.sub.10) of more than 5000 gauss, the permeability of more than 5000 and the thickness of 5.mu. to 30.mu..
Claims5
A magnetic erasing head for erasing recorded signals on a magnetic recording medium which is facing to the front surface of said magnetic erasing head, comprising:
- (A) first, second and third core elements made of ferrite;
- (B) first and second gaps formed between said first and second core elements, and between said second and third core elements, respectively, facing toward said magnetic recording medium;
- (C) one or more magnetic material layers having higher magnetic flux density and higher permeability than the magnetic flux density of said ferrite core elements mounted in said first and second gaps, respectively, said layers having magnetic flux density B.sub.10 of more than 5000 gauss, permeability .mu. of more than 5000, and thicknesses of 5 to 30.mu. in the lengthwise direction of said gaps;
- and
- (D) a winding provided around at least one of said core elements to generate magnetic flux in said core elements by an application of AC current.
2 more elements
Dependencies are inferred from the claim text.