Avoidance of DEP wrong sign toner hole clogging by out of phase

Details Avoidance of DEP wrong sign toner hole clogging by out of phase Avoidance of DEP wrong sign toner hole clogging by out of phase

1990-10-11

1992-03-10

Fuller, Benjamin R.

Recorders

Electric recording

Electrochemical

3461531, G01D 1506

Patent

active

050953222

ABSTRACT:
A non-contact printing device in the form of a Direct Electrostatic Printer (DEP) which is not plagued by aperture clogging and which is well suited for use with a plain paper image receiver. The DEP device includes a supply of toner, an apertured printhead structure and a backing electrode. The printhead structure includes a shield electrode structure and control electrode structure supported by an insulating base member such that the shield electrode structure faces the toner supply. Voltages applied to the toner supply, control electrode, shield electrode and backing electrode effect deposition of toner in image configuration on an image receiver. A pulsed bias is applied to the shield electrode for causing wrong sign toner to deposit thereon instead of the control electrode structure. The natural AC jumping of toner occurring between the toner supply device and the shield electrode structure prevents buildup of toner particles around the printhead apertures.

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