Particulate magnetic recording media having an areally controlle

Details Particulate magnetic recording media having an areally controlle Particulate magnetic recording media having an areally controlle

1988-11-14

1989-08-08

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041814, C25D 1500

Patent

active

048550280

ABSTRACT:
Utilizing the technique whereby particulate media electrodeposited at a critical electric field intensity has a given packing density, and when electrodeposited at a lesser electric field intensity has a lower density, the present invention teaches electrodeposition of media whose particulate packing density varies in accordance with an areally predetermined pattern. The pattern is incised in one electrode of the deposition apparatus, and the medium as deposited on the other electrode mirrors the pattern as a varying particulate packing density. The packing density varies with the electric field intensity, and the electric field varies due to the unequal interelectrode distances arising from the incisions in the electrode. The medium is then magnetized, and the density variation provides a d.c. magnetically reproducible signal in accordance with the pattern.

REFERENCES:
patent: 3117065 (1964-01-01), Wooten
patent: 3715285 (1973-02-01), Tsuchiya

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