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    • 3. 发明授权
    • Surface acoustic wave device
    • 表面声波装置
    • US4558364A
    • 1985-12-10
    • US495494
    • 1983-05-17
    • Jun Yamada
    • Jun Yamada
    • H03H9/145H03H3/08H03H9/64H03H9/72H04N5/44
    • H03H9/14552H03H9/02779H03H9/72H03H9/02992
    • A surface acoustic wave device comprises first interdigital electrodes for converting an electrical signal into a surface acoustic wave, a medium for propagation of the surface acoustic wave generated by the first interdigital electrodes, and second and third interdigital electrodes which again convert the surface acoustic wave into electrical signals. The second interdigital electrodes, acting as output electrodes for a picture signal, have an electrode aperture length which is larger than that of the third interdigital electrodes acting as output electrodes for a sound signal. The second interdigital electrodes have an electrical capacitance between a pair of electrode fingers in unit length which is larger than that of the third interdigital electrodes.
    • 表面声波装置包括用于将电信号转换为声表面波的第一叉指电极,用于传播由第一叉指电极产生的表面声波的介质,以及再次将表面声波转换成第二和第三叉指电极 电信号。 作为图像信号的输出电极的第二叉指电极的电极孔径长度大于作为声音信号的输出电极的第三叉指电极的电极孔径长度。 第二叉指电极在单位长度的一对电极指之间具有大于第三叉指电极的电容的电容。