Magnetic recording arrangement for thermographic printing appara

Details Magnetic recording arrangement for thermographic printing appara Magnetic recording arrangement for thermographic printing appara

1984-10-26

1986-11-04

Goldberg, E. A.

Recorders

Magnetographic

Radiation sensitive

346 742, 346 743, 430 58, G11B 900, G03G 1502

Patent

active

046212698

ABSTRACT:
Magnetic recording arrangement, for example, in a thermomagnetographic plain-paper printer, produces a latent magnetic image on a magnetic recording medium which is composed of a ferromagnetic layer, first magnetized along a predetermined direction before forming the latent magnetic image, and a magnetic layer of high permeability to be converted into a paramagnetic layer by being subjected to the heat from a heating head until the layer is heated to its Curie point or above. The magnetic layers are respectively laminated to opposite sides of a base layer, the heating head being placed at the opposite side of the base layer from the ferromagnetic layer so as to remain out of contact with the ferromagnetic layer, thus making the cleaning of the heating head substantially unnecessary while keeping the latent magnetic image of high quality. In the magnetic recording medium, a direct-current magnetic field of the opposite sense as the magnetized direction of the ferromagnetic layer, or an alternating-current magnetic field the phase of which is reversed at positions corresponding to opposite ends of at least a paramagnetized part, is applied to the paramagnetized part of the high permeable magnetic layer thus forming a magnetic latent image on the ferromagnetic layer by leakage of the magnetic flux from the paramagnetized part to the ferromagnetic layer.

REFERENCES:
patent: 4233382 (1980-11-01), Edwards et al.
patent: 4503438 (1985-03-01), Saitoh et al.
patent: 4520409 (1985-05-01), Kimoto et al.
patent: 4531137 (1985-07-01), Drews et al.

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