充電式ＬＥＤ投光器、バッテリー電圧低下警報方法

摘要

PROBLEM TO BE SOLVED: To provide a rechargeable type LED projector which can surely notify a worker of a warning for battery voltage reduction.;SOLUTION: An LED projector 1 comprises: a light-projection unit 20 having a plurality of LED elements 32; a battery 61 for supplying electric power for causing the light-projection unit 20 to emit light; a light-projection unit drive circuit 52 for controlling the light emission by the light-projection unit 20; and a battery voltage-monitoring circuit 55 for monitoring a voltage of the battery 61. The battery voltage-monitoring circuit 55 sends an alarm signal toward the light-projection unit drive circuit 52 when the voltage of the battery 61 goes to under a warning threshold. On receipt of the alarm signal, the light-projection unit drive circuit 52 causes only an appropriate LED element 32 of the plurality of LED elements 32 to emit light.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2019,JPO&INPIT