Sound transducer and method for operating the sound transducer
AssigneeTDK Electronics Co., Ltd.
InventorsMichael Gebhart, Peter Lukan, Michael Krenn
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Abstract
A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.
Claims22
A sound transducer comprising:
- a carrier body;
- a first piezoelectric element comprising:
- first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and
- at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer;
- a diaphragm configured to generate and/or receive the acoustic signal,
- wherein the diaphragm is mounted in a vibratable manner on the carrier body,
- wherein the first piezoelectric element is configured to convert the electrical signal into a deformation of the diaphragm or vice versa;
- and
- a second piezoelectric element, on which the second external electrode is arranged,
- wherein the second piezoelectric element forms a stacked arrangement with the first piezoelectric element, and
- wherein the stacked arrangement is fixed to one side of the diaphragm.
A method for operating a sound transducer, wherein the sound transducer comprises a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer, the method comprising:
- controlling the second external electrode in such a manner that the electro-acoustic properties of the sound transducer are set in a specific manner, wherein the controlling the second external electrode comprises changing an anti-resonant frequency of the sound transducer after emitting the acoustic signal.
A sound transducer comprising:
- a carrier body;
- a first piezoelectric element comprising:
- first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and
- at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer;
- a diaphragm configured to generate and/or receive the acoustic signal,
- wherein the diaphragm is mounted in a vibratable manner on the carrier body,
- wherein the first piezoelectric element is designed to convert the electrical signal into a deformation of the diaphragm or vice versa;
- and
- a second piezoelectric element, on which the second external electrode is arranged,
- wherein the second piezoelectric element is fixed to the carrier body, integrated in the carrier body or forms the carrier body.
A method for operating an arrangement of a plurality of sound transducers, wherein each of the sound transducers comprises a first piezoelectric element having first external electrodes for generating an acoustic signal from an electrical signal or vice versa and a second piezoelectric element on which a second external electrode is arranged, the method comprising:
- controlling the second external electrodes in such a manner that electro-acoustic properties of each respective sound transducer are set in a specific manner, in which at least one of the second external electrodes is controlled differently than another one of the second external electrodes and in which the different controls ensure that the acoustic signals emitted by the sound transducers at the same time are distinguishable.
Dependencies are inferred from the claim text.