| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a light emitting diode from being overheated by suppressing the heat generating amount of the light emitting diode without decreasing luminous energy even with a high output light emitting diode. <P>SOLUTION: One light emitting diode 11 or two or more are configured to be lit by a lighting circuit 12. A direct current electric power is converted into a pulse electric power by a switching regulator 13 in the lighting circuit, a voltage of the pulse electric power converted by the switching regulator is lowered by an output control section 14. A pulse width of the pulse electric power lowered by the output control section is controlled by a pulse width controlling oscillation means 16, a current of the pulse electric power where the pulse width is controlled by the pulse width controlling oscillation means is regulated by a limiting resistor 17. The pulse electric power where the current is limited by the limiting resistor is configured to be outputted to the light emitting diode. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
