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    • 3. 发明授权
    • Detector for bidirectional movement of an extensible member in an
electronic digital scale
    • 用于电子数字秤中可扩展部件的双向移动的检测器
    • US4150282A
    • 1979-04-17
    • US845792
    • 1977-10-26
    • Junji AokiTetsuo Iwase
    • Junji AokiTetsuo Iwase
    • G01P13/04G01B3/10G01B7/02G01B21/02G01D5/36H03K21/02G06M3/14G01B3/12
    • G01B3/1061G01D5/363H03K21/026G01B2003/1069
    • An extensible tape member is provided to extend along an object to be measured, and to permit a detection plate to rotate in unison with the pulling in and out movement of the extensible member. A pair of photo-electric elements is positioned with respect to the detection plate for developing detection signals in accordance with rotation of the detection plate. The detection signals are developed as a function of an amount of the extension of the tape member and the direction of the tape extension. The detection signals derived from the pair of the elements have a phase difference with respect to each other so as to determine whether the extensible tape member is being pulled out or in the housing of the digital scale, that is, the direction of the extension of the tape member. The detection signals are introduced into a logic circuit for developing control signals which are supplied to a display driver. The driver excites a display which provides an indication of distance information responsive to measured length.
    • 提供可延伸的带状构件以沿待测量的物体延伸,并且允许检测板与可伸展构件的拉入和移出一致地旋转。 一对光电元件相对于检测板定位,用于根据检测板的旋转显影检测信号。 检测信号根据带部件的延伸量和带延伸方向的变化而发展。 从所述一对元件导出的检测信号相对于彼此具有相位差,以便确定可延伸带构件是被拉出还是在数字标尺的外壳中,即扩展方向 磁带成员。 检测信号被引入逻辑电路中,用于产生提供给显示驱动器的控制信号。 驾驶员激发响应于测量长度提供距离信息的指示的显示器。