Piezoelectric ultrasonic transducers having acoustic impedance-matching layers
US4523122A · kind A · utility
109Cited by
8References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1984 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Mar 16, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Ultrasonic transducers comprising an ultrasonic transducer element, a pair of electrodes provided on opposite sides of the element, and an acoustic impedance-matching layer formed on an ultrasonic wave-radiating surface of the element through one electrode. The acoustic impedance-matching layer is made of a porous polymer film or a composite material comprising thermally expanded resin microspheres dispersed in a cured product of thermosetting resin and has an acoustic impedance not larger than 0.6.times.10.sup.6 Ns/m.sup.3. Two-layer constructions may also be used as the acoustic impedance-matching layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.