BATTERY DRIVE TYPE SENSOR DEVICE FOR CRIME PREVENTION

PROBLEM TO BE SOLVED: To provide a sensor device for crime prevention capable of extending a time until the sensor device for crime prevention stops due to a battery life by suppressing battery consumption caused by the object detecting operation of the sensor device for crime prevention when detecting a low battery.SOLUTION: A sensor device D for crime prevention includes: object detection means 34 which is driven by a battery 64 held by a battery holding part 84, and which generates an object detection signal when detecting an object; warning signal output means 15 and 62 which output a warning signal; control means 20A to which the object detection signal generated by the object detection means 34 is input, and which controls the warning signal output means 15 and 62 to output the warning signal in accordance with the object detection signal; low battery detection means 25 which detects the voltage drop of the battery 62; and operation mode switching means 27 which switches the object detecting operation of the sensor device D for crime prevention from a normal mode to a suppression mode for suppressing the consumption of the battery 62 when the low battery detection means 25 detects the voltage drop of the battery 62. 【課題】ローバッテリを検出すると、防犯用センサ装置の物体検知動作に起因する電池消費を抑制して、防犯用センサ装置が電池寿命により停止するまでの時間を延ばすことができる防犯用センサ装置を提供する。【解決手段】電池保持部８４に保持された電池６４によって駆動され、物体を検知すると物体検知信号を生成する物体検知手段３４と、警報信号を出力する警報信号出力手段１５，６２と、物体検知手段３４が生成した物体検知信号が入力され、この物体検知信号に応じて警報信号出力手段１５，６２を制御して警報信号を出力させる制御手段２０Ａと、電池６２の電圧の低下を検出するローバッテリ検出手段２５と、ローバッテリ検出手段２５が電池６２の電圧の低下を検出すると、防犯用センサ装置Ｄの物体検知動作を通常モードから、電池６２の消費を抑制する抑制モードに切り替える動作モード切替手段２７とを備える。【選択図】図３