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20 条记录 (耗时 0.023 秒)

    Surface acoustic wave filter device on 40.degree. to 42.degree. rotated Y-X LITAO.sub.3
    5.
    发明授权
    Surface acoustic wave filter device on 40.degree. to 42.degree. rotated Y-X LITAO.sub.3 失效
    表面声波滤波器装置在40°〜42°旋转Y-X LITAO3

    公开(公告)号：US5874869A

    公开(公告)日：1999-02-23

    申请号：US925732

    申请日：1997-09-09

    申请人： Masanori Ueda ,  Osamu Kawachi ,  Gou Endoh ,  Yoshiro Fujiwara

    发明人： Masanori Ueda ,  Osamu Kawachi ,  Gou Endoh ,  Yoshiro Fujiwara

    IPC分类号： H01L41/09 ,  H03H9/00 ,  H03H9/02 ,  H03H9/145 ,  H03H9/25 ,  H03H9/64

    CPC分类号： H03H9/6483 ,  H03H9/0042 ,  H03H9/02559 ,  H03H9/6436 ,  H03H9/6469 ,  H03H2250/00

    摘要： A surface acoustic wave device includes a piezoelectric substrate of a LiTaO.sub.3 single crystal, the crystal having X, Y and Z axes and a cut plane. The X axis of the crystal is oriented in a direction of propagation of surface acoustic waves. The cut plane of the crystal is rotated around the X axis at a rotated angle from the Y axis to the Z axis, the rotated angle being in a range between 40.degree. and 42.degree.. A pair of reflectors are formed on the substrate and aligned in a row in the direction of propagation. Interdigital transducers are formed on the substrate and aligned in the row in the direction of propagation, the interdigital transducers interposed between the reflectors, each interdigital transducer having pairs of mutually opposed primary electrode fingers and secondary electrode fingers, the interdigital transducers including at least a front transducer, a middle transducer and a rear transducer aligned in the row in the direction of propagation. In the device, a ratio of the number of pairs of the electrode fingers in one of the front transducer and the rear transducer to the number of pairs of the electrode fingers in the middle transducer is in a range between 55% and 80%.

    摘要翻译： 表面声波装置包括LiTaO3单晶的压电基片，具有X，Y和Z轴的晶体和切割平面。 晶体的X轴在表面声波的传播方向上取向。 晶体的切割面以X轴旋转，从Y轴向Z轴旋转，旋转角度在40°〜42°的范围内。 一对反射器形成在基板上并沿着传播方向成一排排列。 叉指换能器形成在基板上并沿着传播方向排列成行，插入在反射器之间的叉指换能器，每个叉指换能器具有成对的相互对置的主电极指和辅助电极指，叉指换能器至少包括前部 传感器，中间传感器和后传感器在传播方向上排成一行。 在该装置中，前换能器和后换能器中的一个中的电极指的对数与中间换能器中的电极指对数的比率在55％至80％的范围内。

    Acoustic surface wave device
    8.
    发明授权
    Acoustic surface wave device 失效
    声表面波装置

    公开(公告)号：US6037698A

    公开(公告)日：2000-03-14

    申请号：US615144

    申请日：1996-03-14

    申请人： Masanori Ueda ,  Yoshiro Fujiwara ,  Takumi Kooriike

    发明人： Masanori Ueda ,  Yoshiro Fujiwara ,  Takumi Kooriike

    IPC分类号： H03H9/25 ,  H03H9/05 ,  H03H9/64 ,  H03H9/10

    CPC分类号： H03H9/1071 ,  H03H9/058 ,  H03H9/64 ,  H01L2224/48091 ,  H01L2224/48227 ,  H01L2924/16195

    摘要： This invention relates to an acoustic surface wave device suitably used in a high-frequency circuit, in which high attenuation characteristics are provided.The present invention includes an acoustic surface wave element, a ceramic package having a ceramic substrate of a multi-layer structure, the ceramic substrate having a die-attach portion on which the acoustic surface wave element is mounted, the ceramic package having an input terminal and an output terminal connected to the acoustic surface wave element, the ceramic package having an opening located above the ceramic substrate, each of the input terminal and the output terminal having a ground terminal, and a metallic cap sealing the opening of the ceramic package. The metallic cap is electrically connected to one of the ground terminal of the input terminal and the ground terminal of the output terminal.

    摘要翻译： 本发明涉及适用于提供高衰减特性的高频电路中的声表面波装置。 本发明包括声表面波元件，具有多层结构的陶瓷基片的陶瓷封装体，陶瓷基片具有安装声表面波元件的管芯附着部分，陶瓷封装具有输入端子 以及连接到所述声表面波元件的输出端子，所述陶瓷封装具有位于所述陶瓷基板上方的开口，所述输入端子和所述输出端子中的每一个具有接地端子，以及密封所述陶瓷封装的开口的金属盖。 金属盖电连接到输入端子的接地端子和输出端子的接地端子之间。

    Position detecting apparatus using a magnetic sensor and a closed magnetic circuit with non-uniform magnetic flux distribution
    10.
    发明授权
    Position detecting apparatus using a magnetic sensor and a closed magnetic circuit with non-uniform magnetic flux distribution 失效
    位置检测装置使用磁传感器和具有不均匀磁通分布的封闭磁路

    公开(公告)号：US4810965A

    公开(公告)日：1989-03-07

    申请号：US906027

    申请日：1986-09-11

    申请人： Yoshiro Fujiwara ,  Michiko Endo ,  Yuji Kojima ,  Noboru Wakatsuki ,  Akira Hirano ,  Kazunari Komenou

    发明人： Yoshiro Fujiwara ,  Michiko Endo ,  Yuji Kojima ,  Noboru Wakatsuki ,  Akira Hirano ,  Kazunari Komenou

    IPC分类号： G01D5/20 ,  G01B7/14 ,  G01R33/04 ,  H01L43/08

    CPC分类号： G01D5/20

    摘要： A position detector having a magnetic sensor for measuring linear or angular displacement, or detecting a position of a body without contact thereto. The detector has a closed circuit including magnets and yokes. The magnetic leakage flux which emanates from the inside surfaces of the yokes is utilized to detect the position of the body. The magnetic sensor is transferred along the inside surfaces of the yokes by a transferring circuit, which senses the magnetic field intensity of the leakage flux distributed thereon. This enables the detector to have a longer measuring range than that of a prior art detectors. An output signal is stable due to the shielding effect of the yokes. The magnetic closed circuit has many magnetic and mechanical configurations. For example, for the magnet, a permanent magnet and an electromagnet can be used. Further, improvements are proposed for enhancing the linearity of the output signal voltage with respect to the transferring distance of the sensing element and for compensating the offset drift of an amplifier or changing the coercive force of permanent magnets.

    摘要翻译： 一种位置检测器，具有用于测量线性或角位移的磁传感器，或者检测身体的位置而不与其接触。 检测器具有包括磁体和轭的封闭电路。 利用从轭的内表面发出的漏磁通来检测身体的位置。 磁传感器通过传递电路沿着轭的内表面传递，传输电路感测分布在其上的漏磁通的磁场强度。 这使得检测器具有比现有技术的检测器更长的测量范围。 输出信号由于磁轭的屏蔽效应而稳定。 磁闭环具有许多磁力和机械结构。 例如，对于磁体，可以使用永磁体和电磁体。 此外，提出了相对于感测元件的传送距离来增强输出信号电压的线性度并且用于补偿放大器的偏移漂移或改变永磁体的矫顽力的改进。