Reversal development method of electrostatic latent image by the

Details Reversal development method of electrostatic latent image by the Reversal development method of electrostatic latent image by the

1982-01-20

1983-03-15

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430122, 118647, 118657, G03G 1309

Patent

active

043768130

ABSTRACT:
An improved reversal development method of visualizing an electrostatic latent image through reversal development, including the steps of: forming a magnetic brush around an outer circumferential surface of a developing sleeve by the use of a developer composed of high-resistivity toner having a resistance value of 10.sup.13 .OMEGA.cm or more under an electric field of 10.sup.4 V/cm and a charge amount of 5 to 15 .mu.Q/g per unit mass generated by gaseous discharge; and applying simultaneously an a.c. bias, and a d.c. bias approximately equal to a sum of a potential of an image portion of the electrostatic latent image and a potential of its non-image portion to the magnetic brush.

REFERENCES:
patent: 4166691 (1979-09-01), Ebi et al.
patent: 4288515 (1981-09-01), Yamashita et al.

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