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Patent Searching and Data


Title:
ELECTROACOUSTIC TRANSDUCER AND ELECTRONIC EQUIPMENT
Document Type and Number:
Japanese Patent JP2004364247
Kind Code:
A
Abstract:

To obtain an electroacoustic transducer capable of reproducing with high efficiency and a high-quality sound, and electronic equipment using it.

A casing is arranged to each side of a diaphragm 104. It supports the diaphragm 104. A driving coil 103 is provided on a vibration plate. A first magnet 101 is so constituted that a space is formed at the center. It is arranged inside the casing so that a center shaft penetrates the space. A second magnet 102 is so constituted that a space is formed at the center. It is arranged inside the casing so that the center shaft penetrates the space. And at the same time, it is arranged to the side reverse to the first magnet regarding the diaphragm 104. Here, the first magnet 101 is arranged so that the magnetizing direction becomes the direction parallel to the center shaft. The second magnet 102 is arranged so that the magnetizing direction becomes the direction reverse to the magnetizing direction of the first magnet 101.


Inventors:
USUKI SAWAKO
SAEKI SHUJI
Application Number:
JP2003427817A
Publication Date:
December 24, 2004
Filing Date:
December 24, 2003
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H04R9/02; H04R7/04; H04R9/00; H04R9/04; (IPC1-7): H04R9/02; H04R7/04; H04R9/00; H04R9/04
Attorney, Agent or Firm:
Shiro Ogasawara