Unit cell for a thermal inkjet printhead
AssigneeSilverbrook Research Pty Ltd
InventorKia Silverbrook
Life of this patent
Estimating the term…
Abstract
A unit cell for a thermal inkjet printhead includes a substrate portion that defines an ink supply passage, Drive circuitry and interconnect layers are positioned on the substrate portion. A nozzle plate defining a nozzle is provided. Side walls depend from the nozzle plate and are positioned on the substrate portion to define an ink chamber. A heater element is connected to the drive circuitry and is positioned intermediate the nozzle plate and the substrate portion. The heater element is suspended in the ink chamber in alignment with the nozzle and is shaped to be symmetrical about two planes that intersect along an axis extending through a center of the nozzle.
Claims3
A unit cell for a thermal inkjet printhead, the unit cell comprising
- a substrate portion that defines an ink supply passage;
- drive circuitry and interconnect layers positioned on the substrate portion;
- a nozzle plate defining a nozzle;
- side walls depending from the nozzle plate and positioned on the substrate portion to define an ink chamber;
- and
- a heater element connected to the drive circuitry and positioned intermediate the nozzle plate and the substrate portion, the heater element being suspended in the ink chamber in alignment with the nozzle and being shaped to be symmetrical about two planes that intersect along an axis extending through a centre of the nozzle.
Dependencies are inferred from the claim text.