INKJET PRINTHEAD HAVING BUBBLE CHAMBER AND HEATER OFFSET FROM NOZZLE

In an inkjet printhead, a substantially rectangular heater element has an aspect ratio greater than about 2Ø A bubble chamber surrounds a centrally disposed heater element with a plurality of walls. A nozzle plate has an orifice for projecting ink from the bubble chamber that axially extends through a thickness thereof. A center of the orifice originates a plumb line such that an offset distance exists from a center of the heater element in a range from about 6 to about 10 microns. An ink flow channel through one of the bubble chamber walls has a primary direction of ink flow substantially paralleling a length dimension of the heater element. The bubble chamber and ink flow channel may exist in the nozzle plate, a polymer barrier layer or a plurality of film layers that define a heater chip. More preferred aspect ratios include greater than about 2.5 and about 4Ø