Approaching vehicle warning speaker device
US9868392B2 · kind B2 · utility
0Cited by
2References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 28, 2014 |
| Grant date | Jan 16, 2018 |
| Priority date | — |
| Expiry date | Mar 28, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This approaching vehicle notification sound speaker device is equipped with a voice coil for conducting an electrical signal, a cylindrical voice coil bobbin on which the voice coil is wound, an insulating sheet, and a cap. The sheet is wound on the voice coil bobbin at a position closer to the sound-emitting side than the voice coil, the cap is disposed closer to the sound-emitting side than the voice coil bobbin, the voice coil bobbin and the cap are made of an aluminum-containing material, and the sheet is formed with the inclusion of an aramid-based nonwoven fabric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.