Electro-acoustic transducer with diaphragm and blank therefor
US4703510A · kind A · utility
Inventor
Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R7/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The transducer diaphragm includes a folded sheet of thin film material, having printed circuit conductors formed thereon in a Greek or serpentine pattern. The Greek pattern includes an odd number of spaced, parallel, printed conductor lines formed into longitudinal and transverse groups, with return conductors extending around the perimeter of the pattern to complete loops of a voice coil. The sheet is folded to form a plurality of rearwardly extending projections, with the folding being along the center lines of each of the longitudinal groups. In the preferred form of the invention, each one of the projections is generally channel-shaped throughout its length, and has a bight portion interconnecting a pair of leg portions, with a longitudinal conductor in the center of the bight and other conductors in the longitudinal group opposite each other on the leg portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.