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    • 2. 发明申请
    • METHOD AND SYSTEM FOR MEASURING THE DISTANCE FROM A PIEZOELECTRIC ELEMENT
    • 测量压电元件距离的方法和系统
    • WO0013039A3
    • 2000-06-08
    • PCT/IL9900470
    • 1999-08-27
    • COMSENSE TECHNOLOGIES LTDANTEBI AMITATSMON ALON
    • ANTEBI AMITATSMON ALON
    • A63H30/02G01S5/30G01S11/16G01S15/10G01S15/46G06F3/033G06F3/043H01L41/09G01S15/02G06K11/14G06K11/16
    • G06F3/0433G01S5/30G01S11/16
    • A method and system for measuring the distance from a piezoelectric substance (10) by transmitting an electromagnetic pulse (14) to the piezoelectric substance so as to generate an acoustic pulse (15) in response thereto. The acoustic pulse is sensed by an acoustic sensor (12) displaced from the piezoelectric substance by an unknown distance, and a time interval between initiation of the electromagnetic pulse and receipt of the acoustic pulse is measured. The distance between the piezoelectric substance and the acoustic sensor is computed by multiplying the measured time interval by the speed of sound, which is known. Upon striking the piezoelectric surface against a surface a modified echo characteristic of the acoustic pulse may be detected. This allows operation of one of a plurality of switches to be detected. By using multiple sensors, the spatial location of the switch can be computed and this allows the specific switch to be identified in a computer keyboard adapted for use with a computer but not physically connected thereto.
    • 一种通过向压电物质传输电磁脉冲(14)来测量与压电物质(10)的距离从而响应于此产生声脉冲(15)的方法和系统。 通过从压电物质移位未知距离的声学传感器(12)来感测声脉冲,并且测量电磁脉冲的发起和声脉冲的接收之间的时间间隔。 通过将测得的时间间隔乘以已知的声速来计算压电物质与声学传感器之间的距离。 在抵靠表面撞击压电表面时,可以检测到声脉冲的修改的回声特性。 这允许检测多个开关中的一个的操作。 通过使用多个传感器,可以计算开关的空间位置,并且这允许特定开关在适用于计算机的计算机键盘中被识别,但是没有物理连接到计算机键盘。