Developing device in electrophotographic copying apparatus

Details Developing device in electrophotographic copying apparatus Developing device in electrophotographic copying apparatus

1975-06-06

1977-05-03

Hix, L. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118DIG23, G03G 1510

Patent

active

040211118

ABSTRACT:
An improved developing device in electrophotographic copying apparatus in which a plurality of developing electrodes are disposed along a path of movement of a photosensitive drum surface. The electrodes are applied with voltages in a graded manner which conforms to the damping characteristic of the potential on the photosensitive surface at a developing station. The values of voltages applied can be controlled in accordance with the value of potential formed by an imaging area of the drum surface while maintaining the graded potential to thereby achieve an excellent developing effect. Further, the drum surface is provided with an unexposed and hence high potential portion which serves to remove toner which accumulates on the electrodes.

REFERENCES:
patent: 3707943 (1973-01-01), Matsumoto et al.
patent: 3778148 (1973-12-01), Fujitsuka et al.
patent: 3892481 (1975-07-01), Schaefer et al.

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