Piezo-electric speaker capsule for telephone handset
US5953414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Nov 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone handset includes a housing containing an earpiece part including a piezo-electric disk joined to an electrically conductive support disk, the edge of the support disk being clamped between two holding parts and separating a rear volume from a front volume. The rear volume is delimited by the combination of the piezo-electric disk and its support disk and by a rear wall facing this combination and a circular lateral wall, the rear wall and the lateral wall constituting a rear part with micro-leaks to constitute with the rear volume an acoustic damper device. The front volume, on the other side of the aforementioned combination constitutes, with holes in a wall of the front volume facing the latter combination, a Helmoltz resonator. The housing further contains a board supporting electronic components in direct contact with the rear wall of the rear volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.