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Audio transducer with controlled flexibility diaphragm Patent #: 4903308
ApplicationNo. 669035 filed on 03/14/1991
US Classes:381/177, Dynamic (e.g., magnetic)181/166, With damping means181/170, Laminated type381/398, Having diaphragm support feature381/423Specified diaphragm shape or structure
ExaminersPrimary: Ng, Jin F.
Assistant: Le, Huyen
Attorney, Agent or Firm
Foreign Patent References
International ClassH04R 025/00
Foreign Application Priority Data1990-05-22 JP
AbstractThere is a dynamic microphone comprising: a diaphragm which can vibrate by an acoustic wave and a voice coil which is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate integratedly with the diaphragm, wherein a number of peripheral treatment agents for damping are coated in a dot shape or a discontinuous stripe shape at intervals onto either one of the front surface and the back surface of the portion of the diaphragm excluding the center dome. With the above construction, a change in stiffness of the diaphragm by the peripheral treatment agents is extremely reduced, it is prevented that the diaphragm resonates at a special frquency, a sudden attenuation of the low frequency limit is prevented, and a low sound can be also certainly collected.