Printhead with high drag nozzle chamber inlets

Details Printhead with high drag nozzle chamber inlets Printhead with high drag nozzle chamber inlets

2010-04-22

2011-12-20

Stephens, Juanita D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S065000, C347S047000

Reexamination Certificate

active

08079669

ABSTRACT:
A printhead that has an array of ink ejection nozzles, an array of chambers adapted to store ink for ejection through each of the nozzles respectively, a silicon substrate for supporting the array of chambers and defining a plurality of ink inlet channels for feeding ink to the array of chambers, the silicon substrate having a planar structure with one surface that supports the chambers and an opposing surface from which the elongate ink feed channels extend, a plurality of actuators, one of the actuators being positioned in each of the chambers respectively for ejecting drops of ink through the nozzle, a plurality of ink inlet channels connecting the ink feed channels to the array of chambers and, layers of CMOS drive circuitry supported on the silicon substrate. The ink inlet channels each extend through the layers of CMOS drive circuitry and each of the ink inlet channels being long and narrow relative to the dimensions of the nozzle such that ink in said chamber is restricted from flowing out during ink drop ejection by viscous drag generated by the ink inlet channel.

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