| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic endoscope system capable of capturing a subject image which is illuminated by any illumination light with correct exposure in observing the subject using the illumination lights with different characteristics.SOLUTION: An electronic endoscope system is composed of: a light source unit for alternately repeating irradiation and non-irradiation of an illumination light, and alternately switching the illumination light to be irradiated between a first illumination light and a second illumination light different from the first illumination light in at least one of light volume and spectral characteristics; an imaging device for imaging a subject illuminated with the illumination light; and imaging device control means for reading out electric charge accumulated by the imaging device during an irradiation period of the illumination light during a non-irradiation period of the illumination light following the irradiation period. In this composition, according to at least one of the difference in light volume and the difference in spectral characteristics between the first illumination light and the second illumination light, the irradiation period of the first illumination light and the irradiation period of the second illumination light are set to different lengths.SELECTED DRAWING: Figure 5 |
