Patent ID: 8328330

Claim:
A nozzle plate structure adapted for bonding to a heater chip to create an ink jet print head, the nozzle plate structure having a substrate layer and an adhesive layer, the nozzle plate structure comprising: a plurality of nozzle holes disposed in said nozzle plate, each of said plurality of holes associated with a corresponding one of a plurality of heater elements disposed in said chip; and an ink flow chamber associated with each of said plurality of nozzle holes, said ink flow chamber extending through said substrate and said adhesive layers such that each of said nozzle holes is in fluid communication with said corresponding heater element; wherein said ink flow chamber includes a wall that extends generally conically from a nozzle hole opening in said substrate layer to a wider opening in said adhesive layer; and wherein further said wall is asymmetrical such that the substrate layer and the adhesive layer each define a portion of an inboard chamber wall and an outboard chamber wall of the ink flow chamber and the inboard chamber wall and the outboard chamber wall extend from the heater chip to the nozzle hole opening at differing wall angles and the portion of the inboard chamber wall in both the substrate layer and the adhesive layer parallel one another as do the portion of the outboard chamber wall in both the substrate layer and adhesive layer parallel one another.