System for cancelling sound waves
US5703337A · kind A · utility
20Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Jul 18, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/161
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An area between a gas exhaust pipe (23) and the front side (26) of a diaphragm (14) near the magnet system (11) is closed off by means of a corrugated cover (27). The presence of the cover (27) prevents acoustic short circuits between the front side (26) and a rear side (28) of the diaphragm (14). Since furthermore the end of the gas exhaust pipe (23, 23'), which protrudes into a space (25), does not reach the end of the diaphragm (14) which is connected with a bead (31), such a loudspeaker (10) can operate at very low continuous output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.