Direct electrostatic printing device (Dep) and printhead structu

Details Direct electrostatic printing device (Dep) and printhead structu Direct electrostatic printing device (Dep) and printhead structu

1995-12-19

1999-03-30

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347141, B41J 206, B41J 2415, B41J 239, B41J 2395

Patent

active

058895400

ABSTRACT:
An apparatus for direct electrostatic printing includes a back electrode and a printhead structure having a plastic insulating layer and printing apertures arranged therein. Individual control electrodes are combined with the printing apertures on a first side of the insulating layer, and a shield electrode is combined with the printing apertures on a second side of the insulating layer. A toner delivery apparatus is also included for delivering a cloud of dry toner particles in the vicinity of the printing apertures. The printing apertures are constructed and arranged such that, when applying a potential difference of 200V between the shield electrode and each individual control electrode, a current of no more that 50 .mu.A flows from each individual control electrode to the corresponding shield electrode through the corresponding printing aperture. Methods for forming the printing apertures in such a printhead are also disclosed.

REFERENCES:
patent: 5095322 (1992-03-01), Fletcher
patent: 5138348 (1992-08-01), Hosaka et al.
patent: 5256246 (1993-10-01), Kitamura
patent: 5278588 (1994-01-01), Kubelik
patent: 5327169 (1994-07-01), Thompson
patent: 5441593 (1995-08-01), Baughman et al.

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