Ink jet printhead having a modulatable cover plate

Details Ink jet printhead having a modulatable cover plate Ink jet printhead having a modulatable cover plate

1993-10-06

1995-07-04

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 47, B41J 204, B41J 214

Patent

active

054304709

ABSTRACT:
A drop on demand type ink jet printhead. The ink jet printhead includes a cover plate formed from an active material, a main body portion having an ink-carrying channel axially extending therein and a device for supplying a pressurized flow of ink to the ink-carrying channel. A rear side surface of the cover plate is mounted to a front side surface of the main body portion to block the ejection of pressurized ink therefrom. When an electric field is applied across the cover plate, the displacement of the cover plate caused thereby provides a path for the ejection of ink from the ink-carrying channel. Specifically, the cover plate includes an edge surface which extends from a front side surface thereof to the rear side surface such that, when the electric field is applied thereacross, an orifice defined by the edge surface and in communication with the ink-carrying channel is formed for the ejection of pressurized ink therefrom. The edge surface may be formed by respective side surfaces of first and second plate sections which lay flush with each other or first and second apertures formed in first and second plate sections which are mounted front to rear.

REFERENCES:
patent: 3786517 (1974-01-01), Krause
patent: 3946398 (1976-03-01), Kyser et al.
patent: 3958249 (1976-05-01), DeMaine et al.
patent: 4536097 (1985-08-01), Nilsson
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4887100 (1989-12-01), Michaelis et al.
patent: 5077565 (1991-12-01), Shibaike et al.
patent: 5227813 (1993-07-01), Pies et al.
patent: 5235352 (1993-08-01), Pies et al.

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