Electromagnetic drive circuitry for anhysteretic duplication of

Details Electromagnetic drive circuitry for anhysteretic duplication of Electromagnetic drive circuitry for anhysteretic duplication of

1991-08-12

1991-12-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

360119, 36013034, G11B 586

Patent

active

050758012

ABSTRACT:
Electromagnetic drive circuitry, for recording information on a flexible magnetic slave disk by contact transfer of information recorded on a flexible magnetic master disk, includes a U-shaped electromagnetic device terminating, respectively, in a first planar pole tip axially aligned with a second movably mounted planar pole tip, to define a closed-loop flux-conducting path extending through a contact-transfer zone between the pole tips. The drive circuitry further includes signal-modulating circuitry for applying an alternating voltage of progressively decreasing amplitude to the electromagnetic device, to develop an alternating magnetic field of progressively diminishing strength in the closed-loop flux-conducting path that produces a corresponding alternating magnetic transfer field extending axially in the contact-transfer zone between the planar pole tips.

REFERENCES:
patent: 2867692 (1959-01-01), Camras
patent: 4071869 (1978-01-01), Feieraband et al.
patent: 4422106 (1983-12-01), Sawazaki
patent: 4644416 (1987-02-01), Yamada

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