Loudspeaker system with forced air circulation and control circuit therefor
US6837333B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 2002 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Jul 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker system has a diaphragm for producing sound, a loudspeaker driver mechanism operable for moving the diaphragm in response to an applied electrical signal from an audio signal source, a blower positioned for directing air under pressure over the loudspeaker driver mechanism so that heat generated by the loudspeaker driver mechanism can be convectively removed, and a control circuit electrically connected to the blower and adapted for connection to the audio signal source such that an increase in the applied electrical signal causes a corresponding increase in speed of the blower. The control circuit includes a power limiting device and a switching device that is connected in parallel with the power limiting device. The switching device is actuable from a normally closed state to an open state when the applied electrical signal is above a predetermined level to regulate the speed of the blower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.