| 摘要 |
When illumination light in an ultraviolet region and a visible light region is emitted from a light source lamp 31, a light quantity of the illumination light is adjusted by a first diaphragm mechanism 33 and a second diaphragm mechanism 34, and sequentially irradiated to an observation target via a rotating filter 35. Subsequently, images of fluorescence and RGB reflection light from the observation target are picked up by an image pickup unit 12 of an endoscope insertion section 10a, and a fluorescence image and a normal image generated in an image processing unit 51 are displayed on a monitor 100. At this time, the first diaphragm mechanism 33 adjusts the light quantities of excitation light and RGB light of a wavelength band of the illumination light, and the second diaphragm mechanism 34 has a transmission property for light in the ultraviolet region and adjusts the light quantity of the RGB light without influencing the light quantity of the excitation light. Thereby, the light quantities of both the excitation light and RGB light emitted form one light source lamp are controlled, and optimal brightness balance can be obtained.
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