Method and apparatus for altering a magnetic characteristic of a

Details Method and apparatus for altering a magnetic characteristic of a Method and apparatus for altering a magnetic characteristic of a

1995-06-21

1997-07-08

Cangialosi, Salvatore

Cryptography

Miscellaneous

H04L 900

Patent

active

056470037

ABSTRACT:
A method for altering a magnetic characteristic of a medium that includes the steps of providing a magnetic write head adjacent to a carrier bearing a fluid magnetic slurry, providing a sequence of randomly arranged information signals, and transmitting the sequence of randomly arranged information signals to a magnetic write head controller. The magnetic write head is operated in response to the controller to provide sequential representations of the randomly arranged information signals at predetermined amplitude levels in the fluid magnetic slurry by altering a magnetically discernible characteristic of the slurry. The fluid magnetic slurry is then cured to permanently fix the sequential representations.
An apparatus in accordance with the invention comprises means for supporting and driving a web bearing a fluid magnetic slurry, magnetic write head means for controllably generating a magnetic field adjacent to the web, means for providing a sequence of randomly arranged information signals, means for transmitting the sequence of randomly arranged information signals to a magnetic write head controller, and means for operating the magnetic write head in response to the controller to provide sequential representations of the randomly arranged information signals at predetermined amplitudes in the fluid magnetic slurry by altering a magnetically discernible characteristic of the slurry.

REFERENCES:
patent: 5177344 (1993-01-01), Pease

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