Piezoelectric transducer assembly and method for generating a cone shaped radiation pattern
US3982142A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1974 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | May 20, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/345
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transducer assembly which generates a cone shaped radiation pattern concentric with a selected axis is formed by a piezoelectric element mounted in a cylindrical resonant cavity defined by a Helmholtz chamber. Circumferentially spaced apart and radially aligned circular apertures are formed in the chamber's cylindrical side wall and an inclined reflecting plate is spaced apart from the apertures a selected distance. The plate extends outwardly from the chamber at an angle of less than 90.degree. to the chamber axis. The cone shaped radiation pattern is produced by generating a plurality of discrete spherical radiation patterns, combining these patterns to form an annular radiation pattern and partially reflecting the annular radiation pattern from an inclined reflection plate extending at an angle to the chamber axis of less than 90.degree. to produce a cone shaped radiation pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.