G - Physics – 11 – B
Patent
G - Physics
11
B
317/29, 352/31,
G11B 25/06 (2006.01) G11B 5/852 (2006.01)
Patent
CA 1208360
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., perpen- dicular 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.
434135
Nelson Alfred M.
Rasekhi Houshang
Sudano John J.
Smart & Biggar
Wang Laboratories Inc.
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