Patent ID: 6984015

Claim:
A semiconductor substrate for an ink jet printhead, the substrate comprising, a silicon substrate having a thickness ranging from about 500 to about 900 microns and having a first surface, and a second surface opposite the first surface, one or more ink feed slots formed in the silicon substrate and extending from the first surface to the second surface thereof, each of the ink feed slots having a first width dimension, opposing first ends, and a first length dimension between the opposing first ends adjacent the first surface of the substrate, and a second width dimension, a second length dimension, and opposing second ends adjacent the second surface of the semiconductor substrate wherein the second width dimension is greater than the first width dimension and the second length dimension is greater than the first length dimension, and stress relieving openings adjacent the opposing first ends of each of the ink feed slots, wherein the stress relieving openings provide an overall feed slot length dimension, and have a radius greater than the first width dimension of the ink feed slot.