Patent ID: 9625386
Date: 2017-04-18
CPC Classifications: A61B,G01N

Claim:
1. An imaging system comprising: a first lighting device that irradiates an imaging target object with visible light; a second lighting device that irradiates the imaging target object with out-of-visible light defined as light other than the visible light; an image sensor that photodetects first light caused by the visible light of the first lighting device, which comes from the imaging target object, and second light caused by the out-of-visible light of the second lighting device, which comes from the imaging target object during a predetermined shutter open period every frame of a predetermined period, and outputs photodetection signals corresponding to a photodetection amount of the first light and a photodetection amount of the second light; and a controller that generates a visible image based on the photodetection amount of the first light and an out-of-visible image based on the photodetection amount of the second light and outputs a composite image of the visible image and the out-of-visible image, wherein the controller comprises: a visible light driving circuit that turns on the first lighting device with a first optical power; an out-of-visible light driving circuit that turns on the second lighting device with a second optical power in synchronism with the shutter open period; a lighting controller that adjusts the second optical power in view of a ratio between the photodetection amount of the first light and the photodetection amount of the second light; wherein one or a plurality of the shutter open period is set every frame, the lighting controller adjusts the second optical power of the second lighting device in such a manner that a ratio V the out-of-visible light driving circuit turns on the second lighting device only during the shutter open period and turns off the second lighting device during other than the shutter open period.