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    • 1. 发明授权
    • Multiple resonant electromechanical filters using edge-mode vibration of
a long piezoelectric plate
    • 使用长压电板的边缘模式振动的多谐振机电滤波器
    • US4396895A
    • 1983-08-02
    • US266073
    • 1981-05-21
    • Hiroshi ShimizuYuji IsekiHiroshi Watanabe
    • Hiroshi ShimizuYuji IsekiHiroshi Watanabe
    • H03H9/125H03H9/50H03H9/58H03H9/15H03H9/60
    • H03H9/581
    • A multimode piezoelectric mechanical filter using edge-mode piezoelectric transducers, each comprising a semi-infinite or long piezoelectric plate polarized in the thickness direction, and a pair of exciting electrodes formed on the plate at an end portion thereof. Input and output edge-mode transducers are supported at their other ends together with optional resonator elements. The transducer and/or resonator elements are mechanically coupled with one another by a coupling rod at their end portions opposite the support to transmit the edge-mode vibration from one to the other. All of the transducers and resonator elements may be disposed in a common plane and may be integrally formed by punching a single piezoelectric plate to form a monolithic type mechanical filter. In such monolithic type filter, coupling rods are also integrally formed with the transducers and resonators. Alternatively, the transducer regions and/or resonator regions are separated and defined by a slit or slits formed in a large square piezoelectric plate, the bottom portion of each slit being usable as the mechanical coupling.
    • 使用边缘模式压电换能器的多模压电机械滤波器,每个包括在厚度方向上偏振的半无限长或长的压电板,以及在其端部形成在板上的一对激励电极。 输入和输出边缘模式换能器在其另一端与可选的谐振元件一起支持。 传感器和/或谐振器元件通过联接杆在与支撑件相对的端部处彼此机械耦合以将边缘模式振动从一个传递到另一个。 所有换能器和谐振器元件可以设置在共同的平面中,并且可以通过冲压单个压电板来一体地形成以形成整体式机械过滤器。 在这种单片式过滤器中,联接杆也与换能器和谐振器一体地形成。 或者,换能器区域和/或谐振器区域由形成在大方形压电板中的狭缝或狭缝分隔和限定,每个狭缝的底部可用作机械耦合。
    • 2. 发明授权
    • Piezoelectric resonators of an energy-trapping type of a width
extensional vibratory mode
    • US4356421A
    • 1982-10-26
    • US241738
    • 1981-03-09
    • Hiroshi ShimizuHiroshi Watanabe
    • Hiroshi ShimizuHiroshi Watanabe
    • H03H9/02H03H9/17H03H9/56H01L41/08
    • H03H9/562H03H9/0207H03H9/02133H03H9/177
    • A piezoelectric resonator of a width-extensional mode vibratory-energy trapping type having a rectangular piezoelectric plate of a width corresponding to a desired resonance frequency. Peripheral electrodes are deposited apart from one another in its lengthwise direction to cover over the width of opposite end portions of the piezoelectric plate in order to lower the cut-off frequency of the opposite end portions of the piezoelectric plate in comparison with the intervening central portion of the plate, so that the width-extensional mode vibratory energy may be trapped or confined within the central portion of the piezoelectric plate. The resonator can be supported and are connected to lead wires at peripheral electrodes.In the piezoelectric plate polarized in its width direction, two excitation electrodes are provided on a surface of the central portion of the piezoelectric plate in parallel with one another, one connected with one of the peripheral electrodes and the other connected to the other peripheral electrode. A set of two excitation electrodes and two spaced peripheral electrodes may be formed on the reverse surface of the piezoelectric plate in registry with those electrodes on its opposite surface. A stray strip-like electrode may be formed between the two excitation electrodes of one surface of the piezoelectric plate. In the case, the stray electrode and two excitation electrodes are disposed so that centers of respective distances between respective adjacent electrode is corresponding to zero point of stress distribution due to the third-harmonic-mode vibration to suppress the third harmonic mode.In the piezoelectric plate polarized in its thickness direction, four peripheral electrodes are formed on the opposite surfaces of the piezoelectric plate, and peripheral electrodes at each end portion are short-circuited with one another. Excitation electrodes are formed on the central exposed regions of the plate intervening between peripheral electrodes. Two excitation electrodes may be formed on each surface of the plate, and are disposed at positions corresponding to zero points of stress distribution due to the third-harmonic mode vibration to suppress the third-harmonic mode.