Telephone receiver with electrostatic discharge prevention
US5440630A · kind A · utility
4Cited by
6References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Feb 18, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Feb 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A receiver including a vibrator plate vibrating together with a voice coil in response to electrification of said voice coil which comprises an electrostatic discharge prevention plate having a central opening arranged above the vibrator plate with a small air gap provided therebetween. A metal cover around the top and sides of the receiver is imbedded in plastic for inhibiting electrostatic discharge via the cover. As a result the discharge path length through the air is substantially increased, reducing the likelihood of electrostatic discharge from the ear of the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.