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    • 3. 发明授权
    • Fire alarm system
    • 火警系统
    • US4300132A
    • 1981-11-10
    • US8809
    • 1979-02-02
    • Takeo ArimaAkira Furuyama
    • Takeo ArimaAkira Furuyama
    • G08B17/11H03K3/354G08B17/10H03K3/281
    • G08B17/11H03K3/354
    • A fire alarm having in a single unit a battery and a fire detecting section energized by the battery to detect abnormal environmental conditions such as heat and smoke to provide an output signal. A voltage decrement detecting section detects a voltage decrement of the battery to provide an output signal. A warning unit such as a buzzer is coupled to a switching circuit for operating the warning unit upon reception of the output signal from either the fire detecting section or the voltage decrement detecting section through an input terminal thereof. To reduce power consumption, the system uses a multivibrator having C-MOS IC, inverters. The output of the voltage decrement detecting section is connected to a control input terminal of the switching circuit and external connection terminals and the output of the fire detecting section are connected to the control input terminal of the switching circuit through diodes, adapted to prevent the influence of the output signal of the voltage decrement detecting section.
    • 一个火灾警报器,在单个单元中具有由电池供电的电池和火灾检测部分,以检测诸如热和烟的异常环境条件以提供输出信号。 电压递减检测部分检测电池的电压降低以提供输出信号。 诸如蜂鸣器的警告单元耦合到开关电路,用于在从火灾检测部分或电压降低检测部分通过其输入端接收到输出信号时操作警告单元。 为了降低功耗,系统采用具有C-MOS IC,逆变器的多谐振荡器。 电压衰减检测部的输出端连接到开关电路的控制输入端子和外部连接端子,火灾检测部分的输出端通过二极管连接到开关电路的控制输入端子,适用于防止影响 的电压递减检测部分的输出信号。