Developing apparatus with variable developing bias voltage

Details Developing apparatus with variable developing bias voltage Developing apparatus with variable developing bias voltage

1988-07-01

1990-03-27

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118657, 355265, G03G 1509

Patent

active

049125133

ABSTRACT:
A copying apparatus in which a developing bias voltage to be applied to a developing sleeve by a power source is changed to adjust the density of a reproduced image, while the electric potential difference between the developing sleeve and a toner supply roller is kept constant. As a result, a density of toner on the developing sleeve is kept constant. Therefore, a development is effected under the condition in which the density of the toner is constant, so that the tone of the image of an original document is reproduced in a desired density.

REFERENCES:
patent: 4230070 (1980-10-01), Murasaki et al.
patent: 4347299 (1982-08-01), Ozawa et al.
patent: 4378158 (1983-03-01), Kanbe
patent: 4432634 (1984-02-01), Tabuchi
patent: 4733267 (1988-03-01), Enoki et al.

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