Speaker, speaker module, and electronic equipment using the speaker module
US7020302B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2002 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Mar 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2834
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker comprising an enclosure 31 provided with a second diaphragm disposed at an opening, and at least one sound generator 40 coupled acoustically with the enclosure. The sound generator is provided with a first diaphragm 27, wherein the second diaphragm has an area greater than an area of the first diaphragm. In the present invention, the shape of the enclosure, and the positioning and shape of the first and the second diaphragms can be designed at a designer's option. Thus a small-sized electronic apparatus can be obtained with a greater designing freedom, while a large-sized diaphragm prevents a decrease of generated sound pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.