Electromagnetic electroacoustic transducer
US6907955B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2003 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | Oct 28, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/06
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An electromagnetic electroacoustic transducer, includes: a diaphragm; a magnet; an electromagnetic coil; and a casing for storing the diaphragm, the magnet and the electromagnetic coil therein. The case has at least one first sound emitting hole through which a front space on a front surface of the diaphragm in the casing communicates with a front outer space in front of the casing and at least one second sound emitting hole through which a rear space on a rear surface of the diaphragm in the casing communicates with the front outer space in front of the casing. A resonant frequency Fv2 of the rear space is set at a value in the range: F0<Fv2≦Fv1 in which F0 is a resonant frequency of the diaphragm, and Fv1 is a resonant frequency of the front space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.