Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Patent
1993-11-09
1994-12-27
Hajeo, Donald
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
360 46, 360 67, 360 68, G11B 502, G11B 509
Patent
active
053770552
ABSTRACT:
A circuit apparatus for driving a magnetic head to generate a magnetic field wherein a driving frequency of the magnetic head is increased and a recording density of an information recording medium is raised. In this circuit apparatus, a bridge circuit is constructed in which a chief coil for generating a magnetic field is arranged between a first connection node disposed between a serially connected first auxiliary coil and first switch element and a second connection node disposed between a serially connected second auxiliary coil and second switch element, and the magnetic field is modulated in accordance with an information signal by on-off control of the first and second switch elements to change the direction of current flowing in the chief coil. Further, third and fourth switch elements are respectively connected in parallel with the first and second switch elements so that a current path of the chief coil is separated from respective current paths of the auxiliary coils. Thus, the current path of current through the auxiliary coil is isolated. Or, there are provided circuits for respectively supplying currents to the chief coil through the first and second auxiliary coils and circuits for respectively supplying currents to the chief coil without passing through the first and second auxiliary coils.
REFERENCES:
patent: 5229902 (1993-07-01), Zucker et al.
Patent Abstracts of Japan, Kokai No. 63-244402, vol. 13, No. 54, Feb. 1989.
Patent Abstracts of Japan, Kokai No. 03-157839, vol. 15, No. 395, Oct. 1991.
Canon Kabushiki Kaisha
Forbus Jr. T. N.
Hajeo Donald
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