Transducer motor structure with enhanced flux
US9282410B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 22, 2014 |
| Grant date | Mar 8, 2016 |
| Priority date | — |
| Expiry date | Jul 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electro-dynamic loudspeaker transducer's motor structure includes a magnetic circuit having a pole with minimal reluctance that allows the use of larger magnets and thicker front plates, thus generating higher flux density in the voice coil gap. The lower reluctance is achieved by increasing the pole piece's outside diameter at all points outside of the voice coil gap and the area swept out by the voice coil at maximal inward excursion. Increasing the pole's diameter over a substantial amount of the pole's distally projecting length (but not extending into the magnetic gap), provides an increased cross sectional area and a reduced magnetic circuit reluctance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.