Title:
SPEAKER
Document Type and Number:
Japanese Patent JP3052477
Kind Code:
B
Abstract:
PURPOSE: To provide a speaker having excellent acoustic output characteristics with less distortion by solving the problem that the magnetic flux in a magnetic gap is fluctuated due to the magnetic flux induced by the current flowing at a voice coil and the distortion occurs at the acoustic output characteristics concerning a speaker used for respective kinds of acoustic equipment.
CONSTITUTION: To a magnetic circuit having a magnetic gap 10, a frame 4 is linked, the outer circumferential part of a diaphragm 5 to link a voice coil 7 inserted into the magnetic gap 10 is fixed to the outer circumferential part of the frame 4, a good conductor such as a copper line is wound to two turns or above to the bottom part of the inner circumferential part of the magnetic gap 10, a shorting coil 9 composed like that is fitted, and thus, the current to generate the magnetic flux in the direction to cancel the magnetic flux induced by the current to flow at the voice coil 7 flows at the shorting coil 9, a magnetic flux in the direction opposite to the magnetic flux occurs, and a speaker with less distortion and having acoustic output characteristics can be obtained.
Inventors:
Tanabe, Takehiko
Application Number:
JP1991000245567
Publication Date:
April 07, 2000
Filing Date:
September 25, 1991
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
C07K14/81; A61K38/00; A61K38/55; A61P9/12; C07K1/113; C07K5/02; C07K5/06; C12N9/99; C07K14/81; A61K38/00; A61K38/55; A61P9/00; C07K1/00; C07K5/00; C12N9/99; (IPC1-7): H04R9/02