Patent ID: 8381387
Filing Date: 2013-02-26
Classification: A61B,B06B,Y10T

Abstract:
1. An ultrasonic transducer fabrication method using a micromachining technique, comprising the steps of: depositing a conductive material on an insulating layer on a surface of a substrate, partially etching the conductive material, and thereby forming lower electrodes; depositing an insulating material so as to cover the lower electrodes and the insulating layer and thereby forming a first insulating layer; depositing a sacrificial material on the first insulating layer, performing etching, and thereby creating two or more cavities and a channel-shaped sacrificial layer which communicates the cavities with each other; depositing an insulating material on the first insulating layer and the sacrificial layer and thereby forming a second insulating layer; partially etching the second insulating layer formed on the channel-shaped sacrificial layer and thereby forming holes; etching and removing the sacrificial layer through the holes and thereby forming the cavities and the channels; depositing a conductive material on the second insulating layer by a vacuum evaporation or a sputtering process so as to plug the holes, thereby forming a conductive film; partially etching the conductive film and thereby forming upper electrodes and sealing portions which plug the holes; and forming a protective film on the second insulating layer using a protective material so as to cover the upper electrodes and the sealing portions.