PURPOSE: To facilitate adjusting the white balance by providing a light guide which guides an illuminating light, a photodetector which receives the illuminating light passing this light guide, and a signal transmission member to which the output of the photodetector is led in an endoscope which converts an optical image to an electric signal to obtain a color picture signal.
CONSTITUTION: Three primary colors from light sources are made incident on a light guide 2 successively at prescribed timings to irradiate an object. The reflected light from the object is made incident on a solid-state image pickup element 24 through an observation window 16, and the picture signal of each of three primary colors is amplified by a preamplifier 41 and is subjected to a prescribed signal processing by a preprocess circuit 42 and is stored in a frame memory 44. Picture data outputted from the frame memory 44 is subjected to D/A conversion and is subjected to a prescribed signal processing by a main process circuit 46 and is converted to a television signal and is outputted to a monitor. In the main process circuit 46, the strength of the picture signal of each of three primary colors is adjusted to attain the white balance.
EINO TERUO
UEDA YASUHIRO
KATO TADASHI
SASAKI MASAHIKO
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