Endoscope apparatus for obtaining properly dimmed observation images

摘要

A CCD driver circuit adjusts and supplies pulse-type signals to a CCD in order to adjust the sensitivity of the CCD. A metering circuit meters a signal output from the CCD. A sensitivity control circuit controls the sensitivity of the CCD by controlling the sensitivity multiplication factor of the CCD based on a metering result by the metering circuit. A metering correcting circuit corrects a metering result from the metering circuit based on a charge multiplication factor from the sensitivity control circuit. An aperture control circuit controls an aperture based on a metering signal corrected by the metering correcting circuit. Thus, an image of an object of which strength of light largely varies can be obtained as an image under a proper dimming state.