Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2004-11-22
2009-12-15
Le, Huyen D (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S430000, C381S396000
Reexamination Certificate
active
07634102
ABSTRACT:
A loudspeaker includes a magnetic circuit having a magnetic gap, a frame coupled to the magnetic circuit, a voice coil having a first end positioned in the magnetic gap and a second end opposite to the first end, and a diaphragm coupled to the second end of the voice coil and the frame. The voice coil has a center axis provided through the first end and the second end. The diaphragm has a first portion in which the center axis of the voice coil is provided. The first portion of the diaphragm is provided inside the voice coil. The diaphragm further has a second portion outside the voice coil. One of the first portion and the second portion of the diaphragm has a cross section in a plane including the center axis, and the cross section of the one of the first portion and the second portion of the diaphragm has an elliptic-arc shape. This loudspeaker has a small thickness, has a high sound pressure level in a high frequency range, and secures a wide reproduction range in high frequencies.
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Chinese Office Action issued Jul. 24, 2009 in a counterpart Chinese application.
Enomoto Mitsutaka
Kubo Kazutaka
Shimokawatoko Takeshi
Sumiyama Masahide
Takase Tomoyasu
Le Huyen D
Panasonic Corporation
Wenderoth, LInd & Ponack, L.L.P.
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