Electrophotographic recording method and apparatus with non-cont

Details Electrophotographic recording method and apparatus with non-cont Electrophotographic recording method and apparatus with non-cont

1988-02-23

1989-09-05

Goodrow, John L.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

430122, G03G 1509

Patent

active

048628280

ABSTRACT:
Non-contact type developing device and method for electrophotographic recording system. The pitch of magnetic poles on a developing sleeve carrying a developer is selected to fall within a predetermined range or is varied such that the pitch increases as the circumferential distance from the point where the gap between the developer carrier member and a photosensitive member is minimum. The bias voltage applied to the developing sleeve is controlled in accordance with a change in the size of the gap between the surface of the photosensitive member and the layer of the developer on the developer carrying member. Alternatively, the bias voltage is applied throughout a period in which the charged region on the photosensitive member is opposed by the developing sleeve.

REFERENCES:
patent: 4672017 (1987-06-01), Kamezaki
patent: 4777107 (1988-10-01), Kurematsu et al.

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