Patent ID: 8158336

Claim:
A method of making a micro-fluid ejection head structure, the method comprising the steps of: applying a tantalum oxide layer to a surface a fluid ejection actuator disposed on a device surface of a substrate so that the tantalum oxide layer is the topmost layer of a plurality of layers including a resistive layer, and a protective layer selected from a passivation layer, a cavitation layer, and a combination of a passivation layer and a cavitation layer; applying a photoimageable layer to the substrate; imaging the photoimageable layer with a radiation source: and developing the imaged photoimageable layer, wherein the tantalum oxide layer has a thickness (t) that satisfies an equation t=(¼*W/n), wherein W is a wavelength of radiation from the radiation source, and n is a refractive index of the tantalum oxide layer.