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1. 发明申请

WO1980001643A1 CAPACITIVE SWITCHING CIRCUIT FOR ENERGIZING REMOTE CONTROLLED DEVICE 审中-公开
标题翻译：用于启动远程控制设备的电容式开关电路
公开(公告)号：WO1980001643A1
公开(公告)日：1980-08-21
申请号：PCT/US1980000018
申请日：1980-01-09
申请人： AMERICAN HOSPITAL SUPPLY CORP
发明人： AMERICAN HOSPITAL SUPPLY CORP , JOHNSON C , CHAN P , JOURDAN R
IPC分类号： A61C03/00
CPC分类号： A61C1/0007 , A61C1/088 , H03K17/962
摘要： The casing (12A) of a hand-held instrument (12) provides a contact surface for a capacitive switching circuit (33A) for energizing a controlled device (63). The switching circuit and device are remote from the contact area. The switching circuit (33A) includes an input circuit (80) incorporating the body capacitance and a variable capacitor (81) which is adjusted to balance the circuit in the presence of only stray capacitance without body capacitance so that the switching circuit remains unactuated. The addition of body capacitance will actuate the switching circuit. In the illustrated embodiment, the input circuit (80) is energized by a periodic signal. An output signal is coupled from the switching circuit to the controlled device through a delay off circuit (88) which has a delay time longer than the period of the periodic signal so that if contact with the instrument is lost momentarily, there is no interruption in the controlled function. This is particularly advantageous in the case of a medical device or dental handpiece where light from a high intensity source is coupled back to the instrument for illuminating the work area.
摘要翻译：手持式仪器（12）的壳体（12A）为电容式开关电路（33A）提供用于激励受控装置（63）的接触面。开关电路和器件远离接触区域。开关电路（33A）包括具有体电容的输入电路（80）和可变电容器（81），该可变电容器（81）被调整为仅在没有体电容的杂散电容的存在下平衡电路，使得开关电路保持不激活。增加体电容将致动开关电路。在所示实施例中，输入电路（80）由周期性信号激励。输出信号通过延迟关断电路（88）从开关电路耦合到受控装置，该延迟关断电路具有比周期信号的周期更长的延迟时间，因此如果与仪器的接触瞬间失去，则不会中断受控功能。这在医疗装置或牙科手机的情况下是特别有利的，其中来自高强度源的光被耦合回到用于照亮工作区域的仪器。

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