Magnetic recording device

Details Magnetic recording device Magnetic recording device

1990-11-29

1992-06-16

Fuller, Benjamin R.

Recorders

Magnetographic

355251, G11B 900

Patent

active

051228157

ABSTRACT:
A magnetic recording device includes a magnetic fluid having a surface, a body having a magnetic surface, an arrangement for forming a magnetic image on the magnetic surface, and an arrangement for moving the magnetic image with respect to the surface of the fluid, to attract the magnetic fluid thereto. A magnetic arrangement is provided to locally raise the surface of the fluid, i.e., to heap it up, so that the magnetic image only attracts magnetic fluid from the raised region thereof. The magnetic arrangement may be a permanent magnet or an electromagnet.

REFERENCES:
patent: 3576623 (1971-04-01), Snelling
patent: 3741760 (1973-06-01), Snelling
patent: 3857549 (1974-12-01), Snelling
patent: 4206467 (1990-06-01), Fujii
patent: 4315267 (1982-02-01), Sonoda et al.
patent: 4734708 (1988-03-01), Saitoh et al.
patent: 5031570 (1991-07-01), Hays et al.
patent: 5034773 (1991-07-01), Nimura et al.
patent: 5036364 (1991-07-01), Murasawa

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