| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of automatically emitting light without an external power source nor a brightness sensor. <P>SOLUTION: The lighting device has a light emitting element 12, a photoelectric conversion element 13, and a battery charger 14. According to an output electric power of the photoelectric conversion element 13, supply of electric power to the light emitting element 12 from the battery charger 14 causes the light emitting element 12 to emit light when the ambient is dark, and charge of the battery charger 14 solves the above problem when the ambient is bright. <P>COPYRIGHT: (C)2008,JPO&INPIT |
