Ink jet printhead for continuous tone and text printing

Details Ink jet printhead for continuous tone and text printing Ink jet printhead for continuous tone and text printing

1993-01-04

1995-05-02

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 47, 347 40, 347 52, B41J 205, B41J 2205

Patent

active

054124107

ABSTRACT:
A thermal ink jet printhead has two or more groups of selectively activatable heating elements and associated nozzles with the heating elements and nozzles within each group having the same geometric parameters, but the geometric parameters of the heating elements and nozzles between groups being different, so that the ejection of droplets from the nozzles of different groups have different ink volumes. When continuous tone and grey scale printing is desired various combinations of nozzles from different groups are used to compose a halftone cell, and when high resolution text printing is desired, either the nozzles from one group or the nozzles from both groups in fixed combinations are used to eject ink droplets onto a recording medium.

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patent: 5121143 (1992-06-01), Hayamizu
patent: 5208605 (1993-05-01), Drake

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