Apparatus for forming an image

Details Apparatus for forming an image Apparatus for forming an image

1989-04-05

1990-01-02

Evans, Arthur G.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

3461531, G01D 1500

Patent

active

048916579

ABSTRACT:
The particles of a first magnetic developing agent are electrostatically attracted to the electrostatic latent image formed on a photosensitive belt, thus forming a first developer image. An AC voltage having a frequency f [Hz] is applied to a magnetic head. The head magnetizes the first developer image, thereby forming a master image. The frequency f satisfies the following inequality: ##EQU1## where V [mm/sec] is the speed at which the developer image moves relative to the magnetic head, and Dt [.mu.m] is the average particle size of a second magnetic developing agent. The particles of the second magnetic developing agent are attracted to the magnetized master image, thus forming a second developer image. The second developer image is transferred from the photosensitive belt onto a sheet of paper.

REFERENCES:
patent: 4649402 (1987-03-01), Lunde et al.
patent: 4768046 (1988-08-01), Minor et al.

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