| 摘要 |
PROBLEM TO BE SOLVED: To carry out light-emission of short pulse width by a simple structure.SOLUTION: A light source 101, a differential circuit 102, and a switch 103 are connected in series. When the switch 103 is turned on, an inrush current passes through a capacitor 102b configuring the differential circuit 102, and a current passes through the light source to carry out light-emission accordingly. If the capacitor 102b is charged, a current passes through a resistance 102a, and voltage drop occurs in the resistance 102a, so that voltage applied on the light source 101 is lowered, and the light-emission is stopped. Values of the resistance 102a and the capacitor 102b are adjusted so as to generate this phenomenon.SELECTED DRAWING: Figure 3 |
