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Electro-acoustic transducer and electronic device
| Details |
Inventors: Usuki, Sawako; Saiki, Shuji;
Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP)
Primary Examiner: Tran; Sinh
Assistant Examiner: Dabney; Phylesha
Attorney, Agent or Firm: Smith Patent Office
A first magnet is provided in an upper case and a second magnet is provided in a lower case so that these magnets face each other. These magnets are magnetized in opposite directions. A diaphragm having a drive coil is placed between these magnets. Thus, magnetic flux emitted from the respective magnets bends in a direction approximately perpendicular to the initial direction of emission of the flux. In the magnetic field, the component of the magnetic flux in the direction of radiation proportional to the driving force is dominant, and is symmetrical relative to the direction of vibration. Therefore, the sound pressure of the reproduced sound is increased and the secondary harmonic distortion caused by asymmetry of the driving force can be reduced. |
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DETAILED DESCRIPTION An object of the present invention is to realize an electro-acoustic transducer that a driving force generating in a drive coil is increased and is made symmetric relative to the direction of vibration so that the sound pressure of the reproduced sound is increased and so that sound can be reproduced with a low distortion, and electronic device using such an electro-acoustic transducer.
An electro-acoustic transducer of the present invention includes a diaphragm, a housing which supports the diaphragm, a first and second magnets which are placed so as to face each other and to face each surface of the diaphragm so that the diaphragm is placed between the magnets, and which are magnetized in opposite directions to each other and are parallel to the direction of vibration of the diaphragm, and a drive coil which is provided on the diaphragm, wherein the drive coil is provided with so as to include lines connecting the outer peripheries of the first and second magnets.
In addition, an electro-acoustic transducer according to the present invention includes a diaphragm, a housing which supports the diaphragm, a first and second magnets which are placed so as to face each other and to face each surface of the diaphragm so that the diaphragm is placed between the magnets, and which are magnetized in the radial direction having a center axis passing through the center of the diaphragm as the center, and a drive coil which is provided on the diaphragm.
An electronic device of the present invention is electronic device provided with either of these electro-acoustic transducers.
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Audio Signal Processing 
