The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2011
Filed:
Jun. 06, 2006
Hideo Kitazawa, Nagano, JP;
Akinori Ushikoshi, Nagano, JP;
Takamasa Kaneko, Shizuoka, JP;
Kenji Yokoyama, Tokyo, JP;
Hideo Kitazawa, Nagano, JP;
Akinori Ushikoshi, Nagano, JP;
Takamasa Kaneko, Shizuoka, JP;
Kenji Yokoyama, Tokyo, JP;
Nidec Pigeon Corporation, , JP;
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.