METHOD OF MANUFACTURING A CAPACITIVE ULTRASOUND TRANSDUCER

摘要

An ultrasonic transducer and method of making the same is disclosed comprisi ng applying a sacrificial material to a substrate (20), applying a polymer coating (24) over at least part of the sacrificial layer and the substrate (20), and removing at least part of the sacrificial material to leave a portion of the polymer coating defining a movable member to define a cavity, the polymer coating being applied in the mobile state. The sacrificial material may be removed by providing etch holes in the polymer coating and removing material through the holes.