Moving voice coil electro-acoustic converter with laminated magnetically anisotropic poles
First Claim
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1. In an electro-acoustic converter comprising:
- a. a center pole;
b. voice coil means surrounding said center pole;
c. magnetic means surrounding said center pole and said voice coil means; and
d. plate means fixed to said magnetic means, said plate means and said center pole defining an air gap accepting said voice coil;
the improvement comprising e. wherein all of said plate means and that portion of said center pole defining said air gap consist of magnetically anisotropic sheets laminating magnetically anisotropic sheets.
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Abstract
An improvement is an electro-acoustic converter having a magnetic circuit with an air gap therein, the improvement including a magnetically anisotropic material in the magnetic circuit. The axes of the anisotropic material are aligned to eliminate flux caused by a voice coil.
21 Citations
1 Claim
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1. In an electro-acoustic converter comprising:
- a. a center pole;
b. voice coil means surrounding said center pole;
c. magnetic means surrounding said center pole and said voice coil means; and
d. plate means fixed to said magnetic means, said plate means and said center pole defining an air gap accepting said voice coil;
the improvement comprising e. wherein all of said plate means and that portion of said center pole defining said air gap consist of magnetically anisotropic sheets laminating magnetically anisotropic sheets.
- a. a center pole;
Specification
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Current AssigneeIsao Yamamuro
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Original AssigneeIsao Yamamuro
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InventorsYamamuro, Isao
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Primary Examiner(s)Claffy, Kathleen H.
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Assistant Examiner(s)Stellar, George G.
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Application NumberUS05/315,962Time in Patent Office1,072 DaysField of Search179/115.5R,115.5VC,117,119R 335/231,236,296,301,302,304US Class Current381/414CPC Class CodesH04R 2209/021 Reduction of eddy currents ...H04R 9/025 Magnetic circuit
