Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – For magnetizing or demagnetizing
Patent
1981-08-31
1983-08-16
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
For magnetizing or demagnetizing
118640, 360134, 417 48, H01F 1300
Patent
active
043994229
ABSTRACT:
Apparatus is provided for uniformly premagnetizing magnetic media, such as wide magnetic tapes and/or for substantially uniformly orienting the magnetic particles in the slurry of the magnetizable layer of magnetic media during their formation. Premagnetization constitutes magnetizing the medium in a preselected direction, such as the transverse direction (i.e., perpendicular to the intended direction of movement of the recording medium past a recording head but in the plane of the medium), prior to magnetically recording information thereon. The apparatus comprises a number of predeterminably arranged small magnets disposed proximate to the medium which obviates the need for large, expensive, heavy magnets and magnet systems. A continuous transverse saturation level of magnetization is provided in the medium with virtually no vertical or longitudinal magnetic components or anomalous effects. A preferred arrangement comprises a number of wafer magnets each having an elongated edge of a pole face disposed proximate to the medium and at a preselected acute angle relative to the direction of intended movement of the magnetic medium.
REFERENCES:
patent: 3117065 (1964-01-01), Wootten
patent: 3441884 (1969-04-01), Eppe
patent: 4043297 (1977-08-01), Hartmann et al.
patent: 4177442 (1979-12-01), Bate et al.
patent: 4197989 (1980-04-01), Pearce
patent: 4253127 (1981-02-01), Kodama et al.
Nelson Alfred M.
Rasekhi Houshang
Sudano John J.
Funk Joseph E.
Harris George
Shanahan Michael H.
Wang Laboratories, Inc.
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