Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2006-07-25
2006-07-25
Ni, Suhan (Department: 2615)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S182000, C381S413000
Reexamination Certificate
active
07082208
ABSTRACT:
A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.
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Kowaki Hiroshi
Nishikawa Akira
Tsumori Katsuhiko
Yoshii Hiroyuki
Fujitsu Ten Limited
Ni Suhan
Timedomain Corporation
Wenderoth , Lind & Ponack, L.L.P.
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