Title:
SPEAKER
Document Type and Number:
Japanese Patent JPH0759189
Kind Code:
A
Abstract:
PURPOSE: To allow a detection coil to correctly detect the vibration of a voice coil by supporting coaxially the voice coil and the detection coil with respect to an MFB type speaker detecting vibration of a vibration system to form a feedback loop.
CONSTITUTION: A detection coil 19 and a voice coil 18 are supported coaxially by a coupling member 51, and the shape of the surface of the coupling member 51 is formed with a smooth curve so as to be spread toward the outside from the center and a rib is formed radially to a rear side of the coupling member 51 to reinforce the member 51.
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Inventors:
YAMADA KENJI
Application Number:
JP22524793A
Publication Date:
March 03, 1995
Filing Date:
August 17, 1993
Export Citation:
Assignee:
SONY CORP
International Classes:
H04R3/04; H04R9/04; (IPC1-7): H04R3/04; H04R9/04
Attorney, Agent or Firm:
Kei Tanabe
Next Patent: SUB WOOFER SYSTEM