| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fire sensor which is capable of adjusting a magnitude of a voltage to be applied between an anode electrode and a cathode electrode in accordance with deterioration in the performance of a UV tube. <P>SOLUTION: In a fire sensor using a UV tube including confronted surface electrodes, one of the confronted surface electrodes is at least one anode electrode and the others are two cathode electrodes of a first cathode electrode and a second cathode electrode. The anode electrode to be used for fire detection can also be used for measuring a voltage to start discharging. Therefore, the number of components is reduced, the fire sensor can be miniaturized in simple configuration, and deterioration in performance or any failure can be detected. Further, an adjustment to a proper voltage is enabled. <P>COPYRIGHT: (C)2013,JPO&INPIT |
