Temperature stable membrane plate structure for a loudspeaker
US10034093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2017 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Jan 31, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a membrane plate structure for generating sound waves. The membrane plate structure comprises a first skin layer, a second skin layer, a foam core layer which is interposed between the first skin layer and the second skin layer, and two binding layers. At least one of the first skin layer and the second skin layer is attachable to a vibrating element for generating sound waves. The elastic modulus of the core layer and its density are lower than the elastic modulus and the density of the first skin layer and the second skin layer, so that a sandwich structure is achieved. The Young modulus and the shear modulus of first skin layer, the second skin layer, the core layer and the binding layers are not variating between each other of more than 30% between a temperature 20° C. and 150° C., particularly between 20° C. and 170° C., more particularly 20° C. and 180° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.