Electrio-acoustic transducers
US4752918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1984 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Jun 13, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B1/0618
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An electro-acoustic transducer according to the invention is of the Tonpilz type comprising a stack of piezo-electric plates placed between a horn and a countermass, and electrodes inserted between the plates. Some of the electrodes are connected to a common excitation or output conductor through phase-shifting circuits which allow the electric voltage of a proportion of these electrodes to be dephased. A logic unit allows the phase-shifting of the electrodes to be distributed within the stack according to several different groupings in dependence upon frequency. One application of the invention is to the construction of long-range power sonars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.