Device for direct electrostatic printing (DEP) comprising an ind

Details Device for direct electrostatic printing (DEP) comprising an ind Device for direct electrostatic printing (DEP) comprising an ind

1995-11-01

2000-03-07

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 204

Patent

active

060330562

ABSTRACT:
A device for use in the technique of direct electrostatic printing (DEP) images onto an intermediate or final substrate. The direct electrostatic printing device includes a receiving member support and a printhead structure which has shield electrodes on a first side and control electrodes on a second side, and which also has apertures therethrough. There is one shield electrode and one control electrode for each aperture. The direct electrostatic printing device also includes a toner delivery mechanism which provides a cloud of toner particles in the vicinity of the apertures. The printhead structure is made of a plastic isolating substrate. The voltage applied to the individual control electrodes is varied according to the contents of the image being printed. A correction voltage is applied to each individual shield electrode and is tuned according to the characteristics of the particular aperture which corresponds to that shield electrode. The values corresponding to the correction voltages for each shield electrode can be stored in a look up table, which will be unique for each printhead structure.

REFERENCES:
patent: 4743926 (1988-05-01), Schmidlin et al.
patent: 5095322 (1992-03-01), Fletcher
patent: 5170185 (1992-12-01), Takemura et al.
patent: 5193011 (1993-03-01), Dir et al.
patent: 5214451 (1993-05-01), Schmidlin et al.
patent: 5229794 (1993-07-01), Honma et al.
patent: 5257046 (1993-10-01), Schmidlin
patent: 5347292 (1994-09-01), Ge et al.
patent: 5353105 (1994-10-01), Gundlach et al.

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