Helmet with built-in speaker system and speaker system for helmet
US7130436B1 · kind B1 · utility
35Cited by
15References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Mar 21, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speaker system is installed in a helmet, and includes a pair of piezoelectric speakers, frames supporting the speakers around the peripheral edges thereof, and laminated films for protecting the piezoelectric film speakers. Each of the frames has its longer sides curved with a radius of curvature of 210 mm to 360 mm in order to support the piezoelectric film speakers in a curved state similarly to the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.