Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 1, 2009
Patent Application Number
10585848
Date Filed
November 18, 2005
Patent Primary Examiner
Patent abstract
A diaphragm has a through-hole for fixing a voice coil at its center part, and has a fixing part of an edge at its outer periphery which is substantially circular. The shape of the outer periphery of diaphragm is formed as follows: a first circle and a second circle overlap each other with their center points displaced in such a manner that at least one part of an outer periphery of the first circle and the second circle forms a part of the substantially circular outer periphery of the entire shape. Using this structure, signal reproduction characteristics can significantly be flattened by reducing the resonance level.
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