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    • 1. 发明授权
    • Magnetic induction type transducer means
    • 磁感应式换能器
    • US4006628A
    • 1977-02-08
    • US633327
    • 1975-11-19
    • Gerald A. St. Jacques
    • Gerald A. St. Jacques
    • G01L1/14G01L5/00G01L9/00G06F3/041
    • G01L9/0085G01L1/14G01L5/00
    • A transducer for converting mechanical forces into corresponding electrical signals. In one embodiment, the transducer takes the form of a writing instrument for use in a user identification system whereby the time-varying force between the instrument and a writing surface generates a waveform which is characteristic of the individual doing the writing. The transducer includes first and second core members being interconnected by a resilient member with the core members being operatively coupled to a coil whose inductance varies in accordance with the forces generated during writing. The coil is operatively coupled to an oscillator whose frequency changes in accordance with the varying inductance to produce the waveform.
    • 用于将机械力转换成相应的电信号的换能器。 在一个实施例中,换能器采用用于用户识别系统的书写工具的形式,由此仪器和书写表面之间的时变力产生作为写入者的特征的波形。 换能器包括通过弹性构件互连的第一和第二芯构件,其中芯构件可操作地耦合到线圈,该线圈的电感根据写入期间产生的力而变化。 线圈可操作地耦合到振荡器,其频率根据变化的电感而变化以产生波形。