Single magnet audio transducer and method of manufacturing
US5604815A · kind A · utility
42Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 8, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Jul 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/047
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio transducer having a having a single magnet and an adjacent iron bar spaced apart to define a gap. The bar has two edges, each positioned near one pole of the magnet to define a respective field across the gap, with the fields being oppositely polarized. An electromagnetic coil is positioned to ocsillate within the gap in response to an audio signal. The transducer is assembled with an unmagnetized magnet. The magnet is magnetized after assembly by application of an external magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.