Patent ID: 6650443
Filing Date: 2003-11-18
Classification: H01L,H04N

Abstract:
An image reading apparatus comprising:light-source means for illuminating an original to be read; photoelectric conversion means for reading light from the original to convert the light into an image signal; illumination-intensity controlling means for controlling illumination intensity of the light-source means; setting means for setting an electric-charge storage time of the photoelectric conversion means in a manner that the photoelectric conversion means is not saturated in a state in which the illumination intensity of the light-source means is maximized by the illumination-intensity controlling means; and first determining means for determining the illumination intensity of the light-source means by controlling the illumination-intensity controlling means in a state in which the photoelectric conversion means directly reads the light of the light-source means after setting of the electric-charge storage time by the setting means.