Apparatus for anhysteretic duplication of a flexible magnetic di

Details Apparatus for anhysteretic duplication of a flexible magnetic di Apparatus for anhysteretic duplication of a flexible magnetic di

1991-08-12

1992-06-09

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

360 16, G11B 586

Patent

active

051212587

ABSTRACT:
Apparatus, 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 predominately a single closed-loop flux-conducting path extending through a contact-transfer zone between the pole tips. A linear actuator, coupled to the movable pole tip, serves for releasably mounting the master disk in intimate facing relationship with the slave disk in the contact-transfer zone between the planar pole tips. Control circuitry applies an alternating electrical signal to the U-shaped electromagnetic device to develop an alternating magnetic field in the closed-loop flux-contacting 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: 3277244 (1966-10-01), Frost
patent: 3986205 (1976-10-01), Fayling
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patent: 4071869 (1978-01-01), Feieraband et al.
patent: 4363038 (1982-12-01), Fayling
patent: 4422106 (1983-12-01), Sawazaki
patent: 4644416 (1987-02-01), Yamada
patent: 4819102 (1989-04-01), Shirai et al.

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