Patent ID: 7670286

Claim:
An electronic endoscope device comprising: an image pick-up unit capable of acquiring an object image with respect to illumination light employed for illuminating the object for each prescribed wavelength band, the object image being divided between at least a first channel and a second channel, each channel having a preprocessing circuit and a color balance correction circuit; a light supply unit having a rotary optical filter for successively supplying illumination light of different wavelength bands, the rotary optical filter being segmented into a plurality of individual wavelength filters defining a wavelength illumination period for each of the different wavelength bands; an exposure period setting circuit for individually setting the exposure period of the image pick-up unit corresponding to the each wavelength band in response to adjustment coefficients generated by the color balance correction circuit and variably adjusting a generation time of an initial charge sweep signal during each wavelength illumination period for adjusting a starting point of the exposure period within each wavelength illumination period, the exposure period of the each wavelength band terminating with a second charge sweep signal coinciding with termination of the wavelength illumination period, the second charge sweep signal transferring picked-up image signals from the image pick-up unit; an amplifier for amplifying the picked-up image signals of the object image obtained with the image pick-up unit corresponding to the each wavelength band; and a control circuit for controllably amplifying the picked-up image signals acquired at the exposure period corresponding to the each wavelength band at computed amplification factors corresponding to the individual exposure period set for the each wavelength band.