Apertured printhead for direct electrostatic printing

Details Apertured printhead for direct electrostatic printing Apertured printhead for direct electrostatic printing

1989-12-18

1991-08-06

Fuller, Benjamin R.

Recorders

Electric recording

Electrochemical

346155, G01D 1506

Patent

active

050381598

ABSTRACT:
Direct electrostatic printing apparatus including structure for delivering developer or 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 radius of the opening of a control electrode is smaller than the radius of a corresponding shield electrode opening resulting in larger peak potentials for controlling toner flow for the same voltage applied to the control electrode of a printhead aperture wherein the control electrode opening is larger than the opening in a corresponding shield electrode opening.

REFERENCES:
patent: 3657599 (1972-04-01), Kashio
patent: 3689935 (1972-09-01), Pressman et al.
patent: 4491855 (1985-01-01), Fuji et al.
patent: 4568955 (1986-02-01), Hosoya et al.
patent: 4658269 (1987-04-01), Rezanka

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