Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1998-08-31
1999-11-23
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1100, G11B 502
Patent
active
059912421
ABSTRACT:
A magnetic head drive device includes a magnetic head having a main coil for magnetic field generation. Current is supplied to the main coil via first to fourth current supply channels. A first auxiliary coil is provided in the first current supply channel through which current is supplied to the main coil from a first direction. A second auxiliary coil is provided in the second current supply channel through which current is supplied to the main coil from a second direction opposite to the first direction. The third current supply channel is provided to be connected in parallel with the first current supply channel so as to supply current to the main coil from the first direction. The fourth current supply channel is provided to be connected in parallel with the second current supply channel so as to supply current to the main coil from the second direction. The first to fourth current supply channels are controlled in accordance with a control signal for designating a given operation mode. When a first operation mode in which the magnetic head generates a modulated magnetic field is designated, the first to fourth current supply channels are controlled to supply a current modulated in accordance with an information signal to be recorded to the main coil. When a second operation mode in which the magnetic head generates a magnetic field in a predetermined direction is designated, the first to fourth current supply channels are controlled to supply a current to the main coil from one predetermined direction.
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Canon Kabushiki Kaisha
Neyzari Ali
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