G - Physics – 11 – B
Patent
G - Physics
11
B
352/57, 352/53.4
G11B 5/02 (2006.01) G06K 19/12 (2006.01) G07F 7/08 (2006.01) G11B 5/39 (2006.01) G11B 5/70 (2006.01) G11B 5/852 (2006.01)
Patent
CA 1193365
: 13 : ABSTRACT OF THE DISCLOSURE A permanently structured magnetic recording tape includes a pattern of first and second regions of acicular iron oxide particles, the first 'A' regions being orientated at 22.5° (clockwise) to the tapes axis and the second 'B' regions being orientated at 67.5° (clockwise) to the tape axis. A permanent magnet applies a developing field at 45° (anti-clockwise) to the tape axis such that, at the transition in orientation direction, the normal components of remanence in 'A' and 'B' regions are in opposite directions, thereby increasing pole strength at the transitions compared with longitudinal development, and enhancing the output signal at the magnetoresistive read-out transducer. A second magnetoresistive transducer senses fluctuations in magnetic polarity at the tape edge to verify whether the medium is genuine.
428136
Emi Limited
Ridout & Maybee Llp
LandOfFree
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