SPEAKER UNIT - SONY CORP

Title:

SPEAKER UNIT

Document Type and Number:

WIPO Patent Application WO/2013/153741

Kind Code:

A1

Abstract:

[Problem] To improve sound quality by lowering mechanical resonance sharpness and reducing oscillation in the neighborhood of a minimum resonance frequency. [Solution] The invention is provided with: a magnet that generates magnetism; a magnetic gap that lets the magnetism act; a yoke at least a portion of which is positioned facing the magnet and that forms a magnetic circuit that guides the magnetism of the magnet to the magnetic gap; a coil bobbin that is formed in the shape of a tube and is enabled to change in an axial direction relative to the magnet and yoke; a coil that is wound on the coil bobbin and at least a portion of which is placed in the magnetic gap; a cone that is vibrated in accompaniment to the change of the coil bobbin; an edge that holds the cone substantially centered; and a frame that affixes the edge and the yoke. A magnetic fluid is introduced into the magnetic gap, the viscosity of the magnetic fluid is made to be at least a specified value, mechanical resonance sharpness is made to be no more than 1.0, and by means of electrical current drive, sound that is proportional to an electrical current is output.

Inventors:

MIYATA KOUJI (JP)

Application Number:

PCT/JP2013/001589

Publication Date:

October 17, 2013

Filing Date:

March 12, 2013

Export Citation:

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Assignee:

SONY CORP (JP)

International Classes:

H04R9/02; H04R7/12; H04R9/04

Domestic Patent References:

WO2010131404A1

2010-11-18

Foreign References:

JPS6121699A	1986-01-30
JPS6118295A	1986-01-27
JP2004511094A	2004-04-08
JPS57208794A	1982-12-21
JPS5846798A	1983-03-18

Other References: