Piezoelectric polymeric film balloon speaker
US4638207A · kind A · utility
70Cited by
8References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1986 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Mar 19, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Piezoelectric polymer film, when conformably adhered to inner or outer curved surfaces of an inflated balloon, for example, acts as a speaker when the metallized coatings of the film are suitably connected to the output of an audio device. The film may be in the form of an helical strip, or individual strips elastically serially connected, or may itself form the inflatable material. Amplifying and impedance matching means may be interposed between the audio output and film coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.