Loudspeaker structure and system
US4653103A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1986 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Feb 5, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/047
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a planar loudspeaker structure comprising planar membrane for forming a diaphragm on which a voice coil of a conductor pattern is formed, and a magnetic circuit for supplying a DC magnetic flux which crosses the voice coil, the conductor pattern includes first and second zigzag conductor pattern portions which are juxtaposed on substantially the entire area of the membrane and connected in series. Opposite ends of the series connection of the first and second conductor pattern portions are respectively connected to first and second terminals for receiving a low-band component of an input audio signal. A high-band component of the input signal is applied to a third terminal connected to a junction between the first and second conductor pattern portions and supplied only to the second conductor pattern portion. The voice coil having the first and second zigzag conductor pattern portions is driven in a multi-drive fashion by driving forces which are weighted relative to each other so as to provide a flat sound pressure/frequency characteristic and a flat electrical impedance characteristic. In addition, the radiation area of the diaphragm is partly weighted by the disposition of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.