Patent ID: 7275298

Claim:
A method of producing an ultrasonic transducer assembly, said method comprising the steps of: creating a multi-layered printed circuit board, having a top surface and bottom surface, wherein one or more of said layers of said board are individually patterned; creating at least one patterned backplate electrode on said board; creating at least one conductive signal via integral with said board; creating a plurality of encasement vias integral with said board, said encasement vias serving to connect ground planes on the sides of said at least one backplate with ground planes beneath said at least one backplate; roughening at least a portion of each of said at least one backplate to introduce gas pockets in said portion of a surface of said at least one backplate; attaching thin insulating or dielectric film on a portion of said board, said film having an integral conducting surface, said conducting surface grounded so as to form a capacitive structure with said at least one backplate and to complete encasement of said at least one backplate, said encasement serving to contain electric fields generated in a space surrounding said at least one backplate during use.