Magnetic audio recording tape and method of preparation thereof

Details Magnetic audio recording tape and method of preparation thereof Magnetic audio recording tape and method of preparation thereof

1983-01-24

1984-09-25

Pianalto, Bernard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427 48, 427127, 427128, 427130, 428694, 428900, H01F 1002

Patent

active

044736193

ABSTRACT:
An audio magnetic recording medium includes a magnetic material carrier backing and a layer of a magnetic material thereover comprising magnetic particles dispersed in a binder, the magnetic particles having a thin coating thereon of a rare earth-containing material, preferably samarium pentoxide. The amount of the rare earth-containing material in the recording medium is only a small percentage by weight of the coated magnetic particles so as not to adversely effect the erasability of the magnetic record to be recorded, but is of sufficient amount to improve the frequency response, signal to noise ratio, or channel separation characteristics thereof.

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patent: 4034133 (1977-07-01), Fleck et al.
patent: 4034134 (1977-07-01), Gregorian et al.
patent: 4047982 (1977-09-01), Sagawa et al.
patent: 4097620 (1978-06-01), Lu
patent: 4145301 (1979-03-01), Bruylants et al.
patent: 4165410 (1979-08-01), Blank
patent: 4332834 (1982-06-01), Takei
Fayling & Benson, "Magnetic Recording Properties of SmCo.sub.5 ", IEEE Transactions on Magnetics, vol. MAG. 14, No. 5, Dec., 1978, (See Applicant Disclosure p. 4, lines 15-30).

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