Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone
US5014322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1988 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Oct 19, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention concerns a diaphragm unit for a condenser microphone and a method of making the same. A conventional condenser microphone is complex in construction and the tension of its diaphragm is readily affected by temperature because first and second rings for holding the diaphragm therebetween and a cylindrical pressing member for pressing the diaphragm to apply tension thereto are separately prepared and mounted in a cylindrical housing. The present invention offers a one-piece diaphragm unit for a condenser microphone in which the diaphragm is held, with predetermined tension, between metallic first and second rings. Preferably, one of the first and second rings is provided with an edge flange which is raised about its inner periphery and extends inwardly of the other ring, biasing thereinto the diaphragm. When the diaphragm unit is built in the condenser microphone, a support plate of an insulating material is disposed in engagement with the first ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.