Ink jet printhead which prevents accumulation of air bubbles the

Details Ink jet printhead which prevents accumulation of air bubbles the Ink jet printhead which prevents accumulation of air bubbles the

1998-01-08

2000-10-10

Braun, Fred L

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 205

Patent

active

061306932

ABSTRACT:
A printhead and method of fabrication thereof provides that the printhead reservoir has substantially the same cross-sectional ink flow area as the total cross-sectional area of the plurality of individual ink channels which interconnect the reservoir with the printhead nozzles. Since the flow area of the reservoir is substantially matched to the total flow area of the channels, the ink capacity of the reservoir is relatively low and the flow rate therethrough during a printing operation is relatively high. The small capacity of reservoir, together with the high ink flow rate therethrough, assures short ink residency time during printing, so that any exsolved air bubbles in the ink are swept away with subsequent ink droplet ejections during a printing operation and thus prevents any air bubbles present from coalescing into larger bubbles which can cause print quality defects.

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