Miniature, high efficiency dual frequency ultrasonic transducer with selectable beamwidth
First Claim
1. An ultrasonic transducer capable of operation at a low frequency resonance and at a high frequency resonance, comprising an annular body of piezoelectric material with an axially extending hole, an outer diameter D, a thickness T, and a width W extending from the hole to the outer diameter, the low frequency resonance being determined by the diameter D and an aspect ratio D/T, and the high frequency resonance being determined by the thickness T and an aspect ratio W/T.
4 Assignments
0 Petitions
Accused Products
Abstract
Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
-
Citations
12 Claims
- 1. An ultrasonic transducer capable of operation at a low frequency resonance and at a high frequency resonance, comprising an annular body of piezoelectric material with an axially extending hole, an outer diameter D, a thickness T, and a width W extending from the hole to the outer diameter, the low frequency resonance being determined by the diameter D and an aspect ratio D/T, and the high frequency resonance being determined by the thickness T and an aspect ratio W/T.
- 11. A transducer assembly comprising a cylindrical tip of 0.018" or less in diameter and having an outwardly facing cup-shaped recess provided therein, an ultrasonic transducer formed of a piezoelectric material disposed in the recess, said body being in the form of an annulus having a centrally disposed hole extending therethrough and an outer diameter and proximal and distal parallel, generally planar surfaces and having a thickness of T extending from the proximal to the distal surfaces and a wall width of W extending from the outer margin of the hole to the outer diameter, adhesive means securing said body in said recess, a first conductor extending through the hole and being bonded to the distal surface, and a second conductor bonded to the proximal surface, the transducer being capable of operating at a low resonance frequency determined by the diameter D and an aspect ratio D/T and at a high resonance frequency determined by the thickness T and an aspect ratio W/T.
Specification