Patents by Inventor Kimihiro Andou

Kimihiro Andou has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electromagnetic electro-acoustic transducer
    Patent number: 6600400
    Abstract: The present invention relates to an electromagnetic electro-acoustic transducer to be used for generating an incoming indicator tone for mobile phones and the like. A resin magnet 11 is formed with a hard magnetic material and a soft magnetic material, the lowest resonant frequency can be easily set by changing the magnetic flux density in a magnetic gap by changing the compound ratio of the soft magnetic material, a high magnetic flux density is attained by increasing the magnetic permeability of the resin magnet 11 with the soft magnetic material, thus achieving a smaller size as well as a higher sound pressure through an increase in the driving force exerted to the diaphragm.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: July 29, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kimihiro Andou, Mitsutaka Enomoto, Masaki Suzumura, Katsuhiko Minaga, Shuji Saiki, Sawako Usuki