Toner supply leveling in multiplexed DEP

Details Toner supply leveling in multiplexed DEP Toner supply leveling in multiplexed DEP

1991-12-23

1993-05-25

Fuller, Benjamin R.

Recorders

Electric recording

Electrochemical

346154, 3461531, 346 11, G01D 1506

Patent

active

052144518

ABSTRACT:
Direct electrostatic printing apparatus including a cylindrically shaped donor structure for delivering imaging material such as toner particles to a printhead forming an integral part of the printing device. The printhead structure includes control electrodes and a shield electrode structure secured to opposite sides of an insulative base. The donor structure has a relatively small diameter compared to such devices of the prior art making it impossible to deliver adequate quantities of toner to some of the printhead apertures using electrical biasing techniques of the prior art. In the device disclosed, the printhead apertures are biased according to the aperture spacing from the donor structure. The magnitude of the bias or its duration applied to the apertures farther from the donor structure surface is such that toner delivery to those apertures is equal to that of all other apertures.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4491855 (1985-01-01), Fujii et al.
patent: 4498090 (1985-02-01), Honda et al.
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4912489 (1990-03-01), Schmidlin
patent: 5040004 (1991-08-01), Schmidlin et al.

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