Patent ID: 7600754
Filing Date: 2009-10-13
Classification: G03G

Abstract:
1. An image reading apparatus for reading an image on an original using image reading means while conveying said original at a predetermined conveyance speed using a conveyance roller that is driven to rotate by a drive motor, said image reading apparatus comprising: temperature detection means for detecting a conveyance-roller temperature of said conveyance roller and outputting a predetermined detection signal; and control means for performing original conveyance speed adjustment processing to adjust said conveyance speed at which said original being read is conveyed by said conveyance roller to a predetermined basic conveyance speed by controlling the rotation of said drive motor on the basis of said detection signal from said temperature detection means, wherein the speed of said conveyance roller is adjusted based on a difference between a reference temperature of said conveyance roller and the detected conveyance-roller temperature in accordance with a variation coefficient value, said variation coefficient value being determined based on a distance said original is advanced per clock pulse by the drive motor at the reference temperature and a distance said original is advanced per clock pulse by the drive motor when the temperature rises by 1° C. beyond the reference temperature.