Loudspeaker

Details Loudspeaker Loudspeaker

2007-01-16

2011-12-20

Garber, Charles (Department: 2812)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S430000, C381S410000, C381S409000, C381S407000, C381S405000, C381S400000, C381S398000, C381S396000, C381S361000, C181S171000, C181S172000, C029S594000, C029S609100

Reexamination Certificate

active

08081791

ABSTRACT:
A loudspeaker includes a frame, a magnetic circuit supported by the frame, voice coil body provided movably in relation to a magnetic gap provided at the magnetic circuit, a diaphragm having an outer rim being joined via a first edge to the frame and an inner rim being joined to the voice coil body, and a damper located towards the magnetic circuit from the diaphragm. The damper has an inner rim joined to the voice coil body. The damper has an outer rim joined via a second edge to the frame. The second edge protrudes towards the diaphragm or in a direction opposite to the diaphragm. The damper includes a first protrusion protruding towards the diaphragm and a second protrusion protruding in a direction opposite to a direction in which the first protrusion protrudes. A protrusion out of the first and second protrusions is closest to the second edge among the protrusions. A further projection out of the first and second protrusions is located more inside than the protrusion and protrudes in a direction opposite to a direction in which the second edge protrudes. The further protrusion has a size largest among sizes of other protrusion. This loudspeaker has a small distortion and a large driving efficiency.

REFERENCES:
patent: 5715324 (1998-02-01), Tanabe et al.
patent: 2005/0175212 (2005-08-01), Murayama et al.
patent: 2009/0123019 (2009-05-01), Funahashi
patent: 1 001 326 (1957-01-01), None
patent: 2-133097 (1990-11-01), None
patent: 2004-007332 (2004-01-01), None
patent: 8204348 (1983-03-01), None
patent: WO 03/092324 (2003-11-01), None
patent: WO 2004/019446 (2004-03-01), None
European Search Report issued in European Patent Application No. 07706789.0-2225, mailed Mar. 17, 2011.

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