Patent ID: 8734335

Claim:
An electronic endo scope comprising: a white light source that emits white light for illuminating a subject; an excitation light source that emits excitation light for generating fluorescent light on the subject; an imaging device that generates first image signals by receiving reflected light of said white light, said reflected light being reflected on the subject, and that generates second image signals by receiving said fluorescent light; a light amount controller that controls the amount of said white light, said light amount controller controlling the amount of said white light so that a normal image and a fluorescent image that are both real-time images representing the same subject at the time of receiving said reflected light and said fluorescent light can be generated, said normal image corresponding to said first image signals, and said fluorescent image corresponding to said second image signals; said light amount controller comprising an aperture and an aperture position controller that controls a position of said aperture; a data memory, in which aperture control data for controlling said position of said aperture are stored, and a data reader, which reads said aperture control data, wherein said aperture position controller controls said position of said aperture, based on said aperture control data read by said data reader and a luminance signal of said reflected light, said aperture control data comprising data that lowers the amount of said white light and that renders said reflected light luminance and a luminance of said fluorescent light almost identical and said light amount controller lowers the amount of said white light based on said aperture control data, so that a pseudo-color image, comprising a composite of said first image signals and said second image signals, can be generated; a mode selector that provides a plurality of user selectable modes, said plurality of user selectable modes comprising a normal image mode in which a normal image is generated based on the reflected light of the white light, a fluorescent image mode in which a fluorescent image based on the fluorescent light is generated, a plurality image mode in which a normal image and a fluorescent image are simultaneously generated and a pseudo-color image mode in which a pseudo-color image based on a mixture of the reflected light of the white light and the fluorescent light, is generated; and said data memory comprising a dimmer table for each of at least three of said selectable modes, each dimmer table containing aperture adjustment data and corresponding light amounts to control the amount of white light to be incident onto the subject.