Patent ID: 8310740

Claim:
An image scanning device comprising: a plurality of photoelectric converters coplanarly arranged in parallel with each other, each of the photoelectric converters having photoelectric conversion elements that are linearly arranged for scanning an image on an original; a relative movement control part which controls relative movement between the photoelectric conversion elements and the original in the parallely-arranged direction of the plurality of photoelectric converters; a combine unit which superimposes conversion results of the plurality of photoelectric converters, wherein the conversion results are based on data obtained by the plurality of photoelectric converters scanning at substantially the same time; and a receive unit which receives a predetermined instruction; wherein the combine unit superimposes the conversion results of the plurality of photoelectric converters with a time lag while the relative movement control part performs the relative movement with a predetermined speed, when the receive unit does not receive the predetermined instruction representing a scan with a resolution lower than the highest resolution, and the combine unit superimposes the conversion results of the plurality of photoelectric converters without the time lag while the relative movement control part increases a speed of the relative movement to become not less than a predetermined number of times, when the receive unit receives the predetermined instruction representing a scan with a resolution lower than the highest resolution, the predetermined number is equal to a number of the plurality of photoelectric converters, and the speed with the resolution lower than the highest resolution is more than the speed with the highest resolution.