Inkjet printhead having selectively actuable nozzles arranged in nozzle pairs
View Patent ↗An inkjet printhead includes a substrate having an array of nozzles grouped in nozzle pairs. Each nozzle pair has a common nozzle chamber and a single actuator configured to selectively eject ink from one or other of the nozzles in the nozzle pair.
1. An inkjet printhead comprising a substrate having an array of nozzles grouped in nozzle pairs, each nozzle pair having a common nozzle chamber and a single actuator configured to selectively eject ink from one or other of the nozzles in said nozzle pair,
wherein said actuator is a moveable actuator configured to cause selective ejection of ink from one or other of the nozzles in a respective nozzle pair while simultaneously causing an inflow of ink from an ink supply channel into the nozzle chamber via an ink inlet defined in said nozzle chamber.
2. The inkjet printhead of claim 1 , wherein each movable actuator incorporates a thermal bend actuator, the thermal bend actuator being configured to undergo movement due to thermal expansion.
3. The inkjet printhead of claim 2 , wherein each thermal bend actuator comprises a beam supporting a paddle, the beam and paddle being arranged so that movement of the paddle from a quiescent position towards a first nozzle of a respective nozzle pair causes ejection of ink from said first nozzle.
4. The inkjet printhead of claim 3 , wherein the beam comprises a core element sandwiched between a pair of resistive elements such that the paddle is selectively moveable in opposite directions from relative to a quiescent position.