| 摘要 |
PURPOSE:To make it possible to reduce the power consumption of an illumination lamp with solar cell by continuously operating the light source for a specified time after the sunset, operating it at every time when the existence of a passenger or the like is detected at midnight, thereby ensuring the safety of passenger till midnight. CONSTITUTION:The output voltage of a solar cell 1 is sufficiently high when the circumferential condition are bright enough at day time, and a secondary call 2 is charged by means of the output power. When it is dark, a light source 3 is put on for a specified time according to the detection results of an illumination detector 5, and after the specified time, the source 3 is put off. When a human body detecting part 1 is operated as it detects the existence of a passenger or the like even after the source 3 is put off, the light source 3 is put on. As a result, the lamp 3 is put on continuously only at the time when there are many passengers after the sunset and it is put on for only a necessary time when there is a passenger or the like around it at midnight after the sunset. It is thus possible to ensure the safety of passenger as well as to reduce the power consumption. |
