Sound generation device
US6009047A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1998 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Jul 31, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R11/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound generating device for generating a sound wave in a body of water is provided. The device includes a pair of axially aligned pistons. An electromagnet is mounted on at least one of the pistons. Activation of the electromagnet causes the pistons to move towards each other. A spring is positioned between the pistons and biases the pistons away from each other. Provision is made for changing the spring rate during operation so that the device will operate at mechanical resonance throughout the intended frequency range. A control device controls the current flowing through the electromagnets. The current is controlled to induce a predetermined variance of axial displacement between the pistons and thereby generate a sound wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.