A developing unit maintains constant density in an electrophotographic imaging
process. The developing unit has:
- a) a developer with a developing surface and a first voltage is applied
to the developer;
- b) a depositor, wherein said depositor is positioned to maintain a gap
with the developer and a second voltage is applied to the depositor;
- c) a cleaning device for said developer, wherein the cleaning device
is in contact with the developer; and
- d) an ink container, wherein the developer, the depositor and the cleaning
device are inside the ink container.
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