G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 11/10 (2006.01) G11B 11/105 (2006.01)
Patent
CA 1325676
ABSTRACT OF THE DISCLOSURE An external magnetic field device for a magnetooptical information recording and reproducing apparatus in which an external magnetic field to be applied to a magnetooptical information recording medium is modulated by supplying to a magnetic head an alternate current the polarity of which is changed according to information to be recorded. The device comprises an offset circuit for producing an offset in the alternate current. The direction of the offset is selected so as to increase the current level of the polarity by which the initial magnetization of the information recording medium is reversed. The direction of the offset may be selected so as to cancel the leakage magnetic field.
606074
Katayama Hiroyuki
Kobayashi Shozo
Miyake Takahiro
Miyake Tomoyuki
Nakayama Junichiro
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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