Contact duplication of magnetically recorded information without

Details Contact duplication of magnetically recorded information without Contact duplication of magnetically recorded information without

1991-02-11

1994-10-04

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

360 17, G11B 586

Patent

active

053531698

ABSTRACT:
Apparatus for, and a method of, duplicating magnetically recorded information by contact transfer from a master medium to a slave medium in the absence of a transfer field. The slave medium comprises a dilute concentration of magnetic particles productive of a demagnetization field that is negligible compared to an external magnetic field of the master medium in its contact-transfer zone. The absence of an appreciable demagnetization field in the slave medium enables the external magnetic field of the master medium to be virtually unopposed in effecting the magnetization of the slave medium.

REFERENCES:
patent: 2738383 (1956-03-01), Herr et al.
patent: 3341854 (1967-09-01), Supernowicz
patent: 3472971 (1969-10-01), Van Den Berg
patent: 4277806 (1981-07-01), Jeffers et al.
patent: 5032931 (1991-07-01), Suzuki et al.

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