Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2011-03-22
2011-03-22
Kuntz, Curtis (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S397000, C381S431000
Reexamination Certificate
active
07912239
ABSTRACT:
A flat speaker comprising a vibrating plate including a spiral voice coil, a lead portion extracted from the vice coil and reinforced by the reinforcing member, and an electric supply line; an edge portion supporting the vibrating plate; and a yoke, supporting the edge portion, on which the permanent magnet arranged to face the voice coil. The flat speaker1of the invention includes a vibrating membrane2of an insulating base film3with a spiral or meandering voice coil4formed on one or both faces thereof, a permanent magnet5arranged on corresponding location facing the voice coil4; and a yoke6on which the permanent magnet5is arranged. The vibrating membrane2is avoided from hitting the permanent magnet by providing a perforated sheet on the back face of the yoke to control acoustic resistance.
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Ikeda Hiroshi
Nakajima Yuichi
Nakajima Yuuzo
Nishikawa Akira
Nishimura Takeshi
Fujitsu Ten Limited
Joshi Sunita
Kuntz Curtis
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
The Furukawa Electric Co. Ltd.
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