Moveable ejection nozzles in an inkjet printhead
First Claim
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1. An inkjet printhead for printing on a media substrate, the printhead comprising:
- a wafer substrate defining a plurality of nozzle chambers for storing ink to be ejected, each of the nozzle chambers having an outer wall that faces the media substrate during use, the wall having an ink ejection port and at least one actuator for moving the ink ejection port away from the media substrate to eject ink from the corresponding nozzle chamber via the ink ejection port, and wherein there is a plurality of actuators in the wall, and wherein the actuators include a surface which bends inwards away from the centre of the nozzle chamber upon actuation, and wherein the actuators are actuated by means of a thermal actuator device, wherein the thermal actuator device has a conductive resistive heating element encased within a material having a high coefficient of thermal expansion.
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Abstract
The invention describes an inkjet printhead. The printhead includes an array of ink chambers, each with an outer wall defining an ink ejection port and having at least one actuator. The outer wall faces the print media substrate during use wherein the actuator move the ejection port away from the media substrate in order eject ink through the port. This arrangement does not have any actuators within the chamber to slow ink refill and the return of the outer wall to its quiescent state assists ink refill.
37 Citations
9 Claims
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1. An inkjet printhead for printing on a media substrate, the printhead comprising:
a wafer substrate defining a plurality of nozzle chambers for storing ink to be ejected, each of the nozzle chambers having an outer wall that faces the media substrate during use, the wall having an ink ejection port and at least one actuator for moving the ink ejection port away from the media substrate to eject ink from the corresponding nozzle chamber via the ink ejection port, and wherein there is a plurality of actuators in the wall, and wherein the actuators include a surface which bends inwards away from the centre of the nozzle chamber upon actuation, and wherein the actuators are actuated by means of a thermal actuator device, wherein the thermal actuator device has a conductive resistive heating element encased within a material having a high coefficient of thermal expansion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification