| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security lamp which surely isolates between a commercial AC power supply side and a battery side to restrict battery consumption during standby. <P>SOLUTION: The security lamp comprises: a first lighting circuit 41 which turns a first LED element 26 on with the power supply of a commercial AC power supply E; and a second lighting circuit 42 which turns a second LED element 27 on with the power supply of a battery 12. The first lighting circuit 41 and the second lighting circuit 42 are connected by a photocoupler 43. The second lighting circuit 42 is provided with a micro discharge circuit 62 which discharges a micro current from the battery 12 when the photocoupler 43 is on. When the photocoupler 43 is turned on, causing the micro discharge circuit 62 to discharge a micro current, a transistor Q7 is turned off and the second LED element 27 goes out. When the photocoupler 43 switches from on to off, causing the micro discharge circuit 62 to stop discharging a micro current, the transistor Q7 is turned on and the second LED element 27 goes on. <P>COPYRIGHT: (C)2013,JPO&INPIT |
