Patent ID: 6246154
Filing Date: 2001-06-12
Classification: G01F,G01S,G10K

Abstract:
An ultrasonic transducer for detecting the distance to an object through a propagation medium, said transducer comprising:a diaphragm for emitting an ultrasonic wave through said propagation medium;a capsule housing, said diaphragm and said capsule housing defining a cavity, said diaphragm and said capsule housing machined from a unitary piece of metal,a piezoelectric crystal housed inside said cavity adjacent said diaphragm;a crystal positioning seal surrounding said crystal between an outer side of said crystal and an inner wall of said capsule, said seal extending along approximately 75%-90% the entire thickness of said crystal;a center spacer having a central orifice for passage of electrical leads to the positive and negative terminals of said crystal, said spacer disposed within a central opening of a backup washer inside said capsule.