Inkjet printhead substrate with crosstalk damping
View Patent ↗An inkjet printhead with a substrate supporting an array of ink ejection nozzles on a first side, each ink ejection nozzle having a chamber for storing ink to be ejected, the chamber having an ink inlet and a nozzle aperture, and a thermal bend actuator for ejecting ink from the chamber through the nozzle aperture. The substrate defines an ink feed channel for each of the ink ejection nozzles respectively, each of the ink feed channels is at least 50 microns long and extends from the ink inlet of the corresponding ink ejection nozzle, towards a second side of the wafer opposing the first side. Feeding ink to the chamber from the opposing side of the wafer through relatively long feed channels practically eliminates, or at least dampens, any fluidic effects on adjacent nozzles. The thermal bend actuators are low power actuators that do not generate enough heat to cause significant thermal crosstalk or structural movement to cause structural crosstalk.
1. An inkiet printhead comprising:
a substrate with a first side supporting an array of ink ejection nozzles, each ink ejection nozzle comprising:
a chamber for storing ink to be ejected, the chamber having an ink inlet and a nozzle aperture;
a thermal bend actuator for ejecting ink from the chamber through the nozzle aperture; and,
the substrate defines an ink feed channel for each of the ink ejection nozzles respectively, each of the ink feed channels extending from the ink inlet of the corresponding ink ejection nozzle, towards a second side of the substrate opposing the first side, in order to establish a fluid connection between the ink inlet and an ink supply; wherein,
each of the ink feed channels is at least 50 microns long.
2. An inkjet printhead according to claim 1 wherein each of the ink feed channels is at least 200 microns long.
3. An inkiet printhead according to claim 1 wherein each of the ink feed channels is approximately 300 microns long.
4. An inkjet printhead according to claim 1 wherein the may of nozzles is pagewidth and self cooling such that heat generated by the thermal bend actuator during normal operating mode is removed by the ejected ink drops.