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    • 6. 发明授权
    • Bounce-nullifying switch unit
    • 跳机无效开关单元
    • US4713564A
    • 1987-12-15
    • US810958
    • 1985-12-19
    • David B. KimballRuloff F. Kip, Jr.
    • David B. KimballRuloff F. Kip, Jr.
    • H03K5/1254H03K17/56H03K5/01
    • H03K5/1254
    • The opening and closure of the contacts of a push-button actuated switch duces across impedance means a voltage which is stably high and low when such contacts are maintained closed and open, respectively. Bouncing of the contacts after their initial closures and openings produces superposition on the stable levels of such voltage of trains of impulses caused by such bouncing. A bistable semiconductor flip-flop is coupled to the impedance means to sense such voltage and to assume a "high" state and a "low" state only when the stable level of such voltage is, respectively, high and low and, further, the flip-flop receives a clock signal. A retriggerable semiconductor monostable multivibrator is coupled to such impedance means to be triggered by such impulses from its stable "off" state to its unstable "on" state which is repetitively renewed by repetitive retriggering of the multivibrator. The multivibrator produces such clock signal only when it reverts to "off" state following the last of the impulses in each train thereof. The impedance means may be a simple resistor or, alternatively, a pulse generating circuit productive of a trigger for the multivibrator in response to either a positive-going or a negative-going fast change in voltage produced by such impulses.
    • 按钮致动开关的触点的打开和闭合产生跨阻抗意味着分别保持闭合和断开时稳定地高和低的电压。 联系人在其初次关闭和开启之后弹跳,在这种弹跳引起的脉冲列车的这种电压的稳定水平上产生叠加。 双稳态半导体触发器耦合到阻抗装置以仅在这种电压的稳定电平分别为高和低时感测这种电压并呈现“高”状态和“低”状态,此外, 触发器接收时钟信号。 可再触发半导体单稳态多谐振荡器耦合到这种阻抗装置,以由这种脉冲从其稳定的“断开”状态触发到其不稳定的“导通”状态,其通过多谐振荡器的重复重新触发重复地更新。 多谐振荡器仅在其每列列中的最后的脉冲之后恢复为“关闭”状态时产生这种时钟信号。 阻抗装置可以是简单的电阻器,或者替代地,响应于由这种脉冲产生的电压的正向或负向快速变化,产生用于多谐振荡器的触发的脉冲发生电路。