Speaker apparatus and electronic apparatus having speaker apparatus enclosed therein
US6731764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Jun 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2205/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker apparatus in which the acoustic sound is radiated by flexural oscillations of a diaphragm in the form of a panel having a substantially flat surface. The speaker apparatus includes a panel-shaped diaphragm the outer rim of which can be oscillated substantially freely at least in the direction along the diaphragm thickness and at least one driver unit constituting an oscillation source secured to the diaphragm surface for imparting oscillations to the diaphragm. The diaphragm is set into flexural oscillations by oscillations applied from the driver unit driven on the basis of the playback input signal. By flexurally oscillating the diaphragm to radiate the acoustic sound, optimum frequency response characteristics can be obtained over a wide frequency range from the low to high frequency range. Moreover, the acoustic sound of optimum sound quality may be radiated in a state of minimum sound pressure level fluctuations over a frequency range from the low to high frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.