Ultrasonic holography imaging device having a macromolecular piezoelectric element transducer
US4412147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1980 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Nov 4, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 .mu.m to 1000 .mu.m thick is used for a piezoelectric element. The piezoelectric sheet is constructed of a macromolecular material including polymers and copolymers of polar monomers. A high frequency signal input device applies to the electrodes coupled to the piezoelectric sheet high frequency signals of different frequencies in a range around a fundamental resonance of the piezoelectric sheet of .+-.10 to .+-.70% of the fundamental resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.