Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takamasa Kaneko0
Akinori Ushikoshi0
Hideo Kitazawa0
Kenji Yokoyama0
Date of Patent
April 12, 2011
Patent Application Number
11447321
Date Filed
June 6, 2006
Patent Primary Examiner
Patent abstract
A speaker may include a center pole and a voice coil bobbin having a bobbin that may include nonmagnetic and electric conductor layers and insulator layers disposed between the electric conductor layers. An electrostatic capacity, which is formed between the center pole and the voice coil bobbin, is detected and outputted as an electrical signal.
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