Device for direct electrostatic printing (DEP) comprising rows o

Details Device for direct electrostatic printing (DEP) comprising rows o Device for direct electrostatic printing (DEP) comprising rows o

1995-11-01

1998-06-30

Fuller, Benjamin R.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347103, 347 55, 347154, 347158, 347124, 347141, B41J 239, B41J 2395, B41J 2385, G03G 908

Patent

active

057741581

ABSTRACT:
A device for use in the technique of direct electrostatic printing (DEP) on an intermediate or final substrate is described, comprising:
a receiving member support 5
a printhead structure 6 having control electrodes 6a on its back side, in combination with apertures 7 and at least one common shield electrode 6b on the front side ;
a toner delivery means 1 presenting a cloud 4 of toner particles in the vicinity of the apertures 7.
The printhead structure 6 is made of a plastic isolating substrate, and has at least two rows of apertures. Preferentially each row has one common shield electrode (6b, 6c) at the front side of the printhead structure. The individual control electrodes on the back side are galvanically isolated per aperture from each other and from each shield electrode. The control electrodes are arranged around the apertures. The size or diameter of the apertures of one row is substantially different from the size of the apertures of a second row. This arrangement allows a high quality reproduction of continuous tone images, along with crisp graphics and characters by one single printing pass.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4860036 (1989-08-01), Schmidlin
patent: 5353105 (1994-10-01), Gundlach et al.
Patent Abstracts of Japan, vol. 7, No. 177 (M-233) (1322), Aug. 5, 1983 and JP-A-58 081 177 (Canon) May 16, 1983.
Patent Abstracts of Japan, vol. 9, No. 121 (M-382) (1844) May 25, 1985 and JP-A-60 006 477 (Nippon Denshin Denwa Kosha) Jan. 14, 1985.
Patent Abstracts of Japan, vol. 9, No. 297, (M-432) (2020), Nov. 25, 1985 and JP-A-60 135 266 (Nippon Denshin Denwa Kosha) Jul. 18, 1985.

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