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7 条记录 (耗时 0.008 秒)

    Measuring instrument of magnetic field
    4.
    发明公开
    Measuring instrument of magnetic field 失效
    仪表的磁场。

    公开(公告)号：EP0086387A1

    公开(公告)日：1983-08-24

    申请号：EP83100883.4

    申请日：1983-01-31

    申请人： Hitachi, Ltd.

    发明人： Matsumura, Hiroyoshi ,  Katsuyama, Toshio ,  Ohta, Norio ,  Suganuma, Tsuneo ,  Nagatsuma, Kazuyuki ,  Sugita, Yutaka

    IPC分类号： G01R33/032 ,  G02F1/09 ,  G01R15/07

    CPC分类号： G02F1/0036 ,  G01R33/0322

    摘要： A measuring instrument of magnetic field utilizing Faraday rotation is disclosed in which a medium exhibiting Faraday rotation includes at least one thin magnetic garnet film (17, 17') magnetized in a propagation direction (13) of light and having a composition expressed by a general formula R 3 - x Q x (Fe 5 - y M y )O 12 (where R indicates at least one element selected from a group consisting of Y, La, Lu, Ca, Sm and Bi, 0 indicates at least one element selected from a group consisting of Gd, Eu, Er, Tm, Tb, Yb, Ho and Dy, M is at least one element selected from a group consisting of Ga, Al, Ge, Si, Sc, Mn, In, V and Cr, the value of x lies in a range expressed by a formula 0.1 ≤ x ≤ 3.0, and the value of y lies in a range expressed by a formula 0 ≤ y ≤ 1.5). According to this instrument, stable measured values are obtained independently of temperature variation.

    Piezoelectric resonator
    6.
    发明公开
    Piezoelectric resonator 失效
    压电谐振器

    公开(公告)号：EP0043032A3

    公开(公告)日：1982-01-13

    申请号：EP81104654

    申请日：1981-06-16

    申请人： Hitachi, Ltd.

    发明人： Takeuchi, Hiroshi ,  Jyomura, Shigeru ,  Nagatsuma, Kazuyuki ,  Hikita, Mitsutaka ,  Ito, Yukio ,  Ashiba, Sakichi

    IPC分类号： H03H09/17 ,  H03H09/13 ,  H03H03/04

    CPC分类号： H03H9/562

    摘要： The piezoelectric resonator of this invention consists of a piezoelectric ceramic plate (2) which is polarized in the direction of thickness over the entire plate, whereby two split electrodes (6, 8) are formed on one main surface of the piezoelectric ceramic plate (2), while an electrode (4) is formed on the entire main surface opposed to the above main surface on which are formed the split electrodes (6, 8). When an operating voltage is supplied to the above two split electrodes (6, 8) the piezoelectric ceramic plate (2) between the two split electrodes (6, 8) and the other electrode (4) undergoes resonance in a thickness dilational mode with a phase difference of 180°.

    Piezoelectric resonator
    7.
    发明公开
    Piezoelectric resonator 失效
    压电谐振器。

    公开(公告)号：EP0043032A2

    公开(公告)日：1982-01-06

    申请号：EP81104654.9

    申请日：1981-06-16

    申请人： Hitachi, Ltd.

    发明人： Takeuchi, Hiroshi ,  Jyomura, Shigeru ,  Nagatsuma, Kazuyuki ,  Hikita, Mitsutaka ,  Ito, Yukio ,  Ashiba, Sakichi

    IPC分类号： H03H9/17 ,  H03H9/13 ,  H03H3/04

    CPC分类号： H03H9/562

    摘要： The piezoelectric resonator of this invention consists of a piezoelectric ceramic plate (2) which is polarized in the direction of thickness over the entire plate, whereby two split electrodes (6, 8) are formed on one main surface of the piezoelectric ceramic plate (2), while an electrode (4) is formed on the entire main surface opposed to the above main surface on which are formed the split electrodes (6, 8). When an operating voltage is supplied to the above two split electrodes (6, 8) the piezoelectric ceramic plate (2) between the two split electrodes (6, 8) and the other electrode (4) undergoes resonance in a thickness dilational mode with a phase difference of 180°.