Electromagnetic type acoustic transducers
OwnerTadashi Sawafujiinventor
Life of this patent
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Abstract
An electromagnetic type acoustic transducer comprises a vibratable diaphragm including a conductor and disposed within a magnetic field defined by a permanent magnet. Support members which are expandable and contractible in the direction at right angles with the diaphragm are fixed to both surfaces of the diaphragm. A frame is provided for fixing the support members such that the expansion and contraction thereof is not prevented. The support members may be folded and formed to a bellows-like state. Use is also made of a conductor forming spiral convolutions. The permanent magnet is disposed and retained at a vibration gap with respect to the diaphragm.
Claims5
An electromagnetic type acoustic transducer comprising a vibratable diaphragm including a conductor and disposed within a magnetic field defined by a permanent magent, support members which are expandable and contractible in the direction at right angles with said diaphragm and are fixed to both surfaces thereof, and a frame to which said support members are fixed such that the expansion and contraction thereof are not prevented.
Dependencies are inferred from the claim text.