Acoustic device using higher order harmonic piezoelectric element
First Claim
Patent Images
1. A touch sensor having an operating frequency, comprising:
- a touch sensitive substrate; and
a piezoelectric element operably coupled to the substrate, wherein the piezoelectric element is characterized by a higher order odd resonant frequency approximately equal to the operating frequency.
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Abstract
An acoustic-based system, such as a touchscreen system, is provided. The system comprises an acoustic substrate and an acoustic transducer operably coupled to the substrate. The transducer exhibits a higher order odd resonant frequency that is equal to the operating frequency of the system. As a result of using the higher resonant frequency that is substantially equal to the operating frequency, the thickness of the transducer can be increased, and thus made more durable.
17 Citations
69 Claims
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1. A touch sensor having an operating frequency, comprising:
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a touch sensitive substrate; and
a piezoelectric element operably coupled to the substrate, wherein the piezoelectric element is characterized by a higher order odd resonant frequency approximately equal to the operating frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of sensing touches on a touch sensor, comprising:
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transmitting an acoustic wave across an acoustic substrate with a piezoelectric element, the acoustic wave having a frequency approximately equal to a higher order odd resonant frequency of the piezoelectric element;
receiving the acoustic wave from the substrate; and
processing the acoustic wave at the higher order odd resonant frequency to determine whether the substrate has been touched. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An acoustic-based system having an operating frequency, comprising:
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an acoustic substrate having a surface and being configured for propagating acoustic waves parallel to the substrate surface; and
a piezoelectric element operably coupled to the substrate, wherein the piezoelectric element is characterized by a higher order odd resonant frequency approximately equal to the operating frequency. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of using an acoustic substrate, comprising:
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transmitting an acoustic wave parallel to a surface of the acoustic substrate with a piezoelectric element, the acoustic wave having a frequency approximately equal to a higher order odd resonant frequency of the piezoelectric element;
receiving the acoustic wave from the substrate; and
processing the acoustic wave at the higher order odd resonant frequency. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A touch sensor having an operating frequency, comprising:
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a touch sensitive substrate; and
an acoustic transducer operably coupled to the substrate, wherein the acoustic transducer has a higher order resonant frequency approximately equal to the operating frequency. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A method of sensing touches on a touch sensor, comprising:
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transmitting an acoustic wave across an acoustic substrate with an acoustic transducer, the acoustic wave having a frequency approximately equal to a higher order odd resonant frequency of the acoustic transducer;
receiving the acoustic wave from the substrate; and
processing the acoustic wave at the higher order odd resonant frequency to determine whether the substrate has been touched. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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Specification