Illuminating light supply system in electronic endoscope apparatus

摘要

In an electronic endoscope apparatus, image signals from a solid state image pickup device are converted into television picture signals, and pictures are displayed on a monitor television on the basis of the television picture signals. At least one chopper is arranged between a light source and an end of an optical system for transmitting an illuminating light from the light source to an illuminating window of an endoscope. The chopper is rotated by a motor to bring the illuminating light into the form of pulses. Rotation of the chopper is controlled in such a manner that a center of supply time duration of each illuminating light pulse is brought into coincidence with a point of time at which the image signals to be offered to either one of odd and even field scannings are transferred from a light receiving portion to a memory portion of the image pickup device.