Patent ID: 7721397

Claim:
A method for fabricating capacitive ultrasonic transducers, the method comprising: providing a substrate; forming a flexible layer on the substrate; forming a first conductive layer on the flexible layer; forming a patterned sacrificial layer on the first conductive layer; forming a first polymer layer over the patterned sacrificial layer; patterning the first polymer layer to provide a patterned first polymer layer, exposing portions of the patterned sacrificial layer through openings; forming a second conductive layer on the patterned first polymer layer; patterning the second conductive layer to provide a patterned second conductive layer; forming a second polymer layer over the patterned second conductive layer; patterning the second polymer layer, exposing portions of the patterned sacrificial layer through the openings; and removing the patterned sacrificial layer through the openings.