Ribbon microphone
AssigneeKabushiki Kaisha Audio-Technica
InventorHiroshi AKINO
Life of this patent
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Abstract
To suppress the transverse displacement of a ribbon due to an impact to a level smaller than that achieved by electromagnetic damping. The switch 150 breaks a path between the piezoelectric element 140 and the secondary winding 132 so as to be non-conductive when a power plug is connected (the microphone is in use), and completes a path between the piezoelectric element 140 and the secondary winding 132 so as to be conductive when a power plug is not connected (the microphone is not in use), in order to generate a driving force in the direction opposite to the displacement direction of the ribbon 10 by causing a current corresponding to power generated in the piezoelectric element 140 to flow in the ribbon 10.
Claims5
A ribbon microphone, comprising:
- an acoustic-electric converter including a pair of permanent magnets that form a parallel magnetic field and a diaphragm of metallic ribbon foil that is placed in the parallel magnetic field and vibrates in response to incoming sound waves;
- and
- a step-up transformer including a primary winding connected to the diaphragm and a secondary winding connected to an output connector, the output connector receiving a power plug of a phantom power supply when the microphone is in use, the step-up transformer increasing a voltage generated by the diaphragm to a predetermined voltage, the voltage then being output to the phantom power supply side through the output connector, wherein
- the ribbon microphone further comprising a piezoelectric element that generates electric power in response to an external impact on the acoustic-electric converter, one electrode of the piezoelectric element being connected to one lead of the secondary winding, another electrode of the piezoelectric element being connected to another lead of the secondary winding via a switching device, wherein
- the switching device breaks a path between said another electrode of the piezoelectric element and said another lead of the secondary winding so as to be non-conductive when the power plug is connected, and the switching device completes the path between said another electrode of the piezoelectric element and said another lead of the secondary winding so as to be conductive when the power plug is not connected.
Dependencies are inferred from the claim text.