Information recording method and apparatus

Recorders – Magnetographic

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G01D 1512

Patent

active

044893329

ABSTRACT:
An information recording method and apparatus for forming a magnetic latent image on a magnetic recording medium, developing the magnetic latent image to a visible image with a magnetic toner and recording the developed images on a recording sheet, in which the magnetic toner is electrically charged to a predetermined polarity; and a rotatable magnetic recording medium comprising a magnetic recording layer for forming a magnetic latent image thereon is also electrically charged to the same polarity as that of the electrically charged magnetic toner, in such a manner that the magnetic attraction between the electrically charged magnetic toner and the magnetic latent images is stronger than the electrostatic repulsion between the electrically charged magnetic toner and the electrically charged magnetic-latent-image-bearing recording medium, but said electrostatic repulsion predominates in the background areas, whereby deposition of the toner on the background areas outside the image area is completely eliminated.

REFERENCES:
patent: 2857290 (1958-10-01), Bolton

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