Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takamasa Kaneko0
Akinori Ushikoshi0
Hideo Kitazawa0
Kenji Yokoyama0
Date of Patent
January 4, 2011
Patent Application Number
11447332
Date Filed
June 6, 2006
Patent Primary Examiner
Patent abstract
A speaker may include a voice coil bobbin and a center pole. The voice coil bobbin may include a nonmetallic pipe body as a base of the voice coil bobbin, a first nonmagnetic and electric conductor film which is formed on an inner peripheral face of the pipe body, and a second electric conductor film which is formed on an outer peripheral face of the pipe body such that the first electric conductor film is covered by the second electric conductor film through the pipe body. An electrostatic capacity that is formed between the voice coil bobbin and the center pole is detected and outputted as an electric signal.
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