| 摘要 |
A light source control device for an endoscope having a light source for emitting light to be incident on a light guide, a stop mechanism for varying the quantity of light to be incident on the light guide by interrupting an optical path of light, and a control device for controlling an opening of the stop mechanism. The stop mechanism includes a sensing device for sensing the opening of the stop mechanism and outputting a sensing signal to the control device. Further, the stop mechanism includes a shaft and a stop blade rotatably supported on the shaft and being disposed in the optical path such that the quantity of light passing thereby is varied by rotating the blade. The sensing device includes an arc-shaped plate fixed to the shaft and having a radius which varies in proportion to the change in arc angle, and a sensor having an opening for receiving the circumferential edge of the arc-shaped plate to sense the amount of light which passes through the opening. |
