Speaker capable to playback in wide frequency range
US6804370B2 · kind B2 · utility
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4References
7Claims
0Family size
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Key dates
| Filing date | Mar 26, 2003 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Mar 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker capable to playback in wide frequency range by means of reducing peak values of amplitude of resonance frequencies in frequency characteristics is provided by means of differing a radius of curvature R1 of an inner diaphragm 10a and a radius of curvature R2 of an outer diaphragm 10b to differ resonance frequencies of the inner diaphragm 10a and the outer diaphragm 10b. Furthermore, by means of equalizing an area S1 of the inner diaphragm 10a and an area S2 of the outer diaphragm 10b, sound pressure levels of the inner and outer diaphragms 10a, 10b are equalized with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.