DIAPHRAGM AND LOUDSPEAKER USING SAME - MATSUSHITA ELECTRIC IND CO LTD

Title:

DIAPHRAGM AND LOUDSPEAKER USING SAME

Document Type and Number:

WIPO Patent Application WO/2006/054687

Kind Code:

A1

Abstract:

A diaphragm (9) is provided with a through hole (10) at a center section for fixing a voice coil, and a fixing section for an edge (12) at an outer circumference section, and has a substantially circular outer circumference shape. The diaphragm (9) has the outer circumference shape wherein first and second circles (9A, 9B) having different radiuses are put one over another with their center points (9a, 9b) shifted and at least a part of the outer circumference shape of the first and second circles (9A, 9B) form a part of the substantially circular outer circumference of the entire shape. Signal reproduction characteristics can be flattened as much as possible by reducing a resonance level.

Inventors:

FUNAHASHI OSAMU

Application Number:

PCT/JP2005/021225

Publication Date:

May 26, 2006

Filing Date:

November 18, 2005

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
FUNAHASHI OSAMU

International Classes:

H04R7/18; H04R7/12; H04R9/04

Foreign References:

JPH07162992A	1995-06-23
JPH09284886A	1997-10-31
JPS3618103Y1	1961-07-13
JPS452459Y1	1970-01-31
JPS4741471Y1	1972-12-15
JPS5010231U	1975-02-01
JP2004048432A	2004-02-12
JPS61121687A	1986-06-09
JPS63236499A	1988-10-03
US20030053645A1	2003-03-20

Other References: