| abstract |
The invention provides an endoscope which has a reduced-diameter insertion portion, which is capable of observation using a plurality of types of light with different spectral characteristics, and which can obtain high-resolution images. The invention provides an endoscope system comprising a light-source portion for emitting a plurality of types of irradiation light having different spectral characteristics, which are radiated towards an acquisition object; an optical system for transmitting the irradiation light towards the acquisition object; an image-acquisition portion, disposed in a portion inserted inside the body cavity and capable of acquiring fluorescence emitted from the acquisition object due to irradiation with the plurality of types of irradiation light, and light of a different wavelength band from the fluorescence; a variable-spectrum unit, disposed in a light path between the image-acquisition portion and a tip of the portion inserted inside the body cavity and capable of changing a wavelength band of light incident on the image-acquisition portion from the acquisition object by varying spectral characteristics thereof; and a control portion for controlling the light-source portion, the variable-spectrum unit, and the image-acquisition portion in association with the spectral characteristics of the irradiation light that the light-source portion emits, the spectral characteristics of the variable-spectrum unit, and a light exposure level of the image-acquisition portion. |