Image scanning device including a combine unit which superimposes conversion results of a plurality of photoelectric converters

The 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 means for controlling relatively movement between the photoelectric conversion elements and the original in the parallely-arranged direction of the plurality of photoelectric converters;
• a combine means for superimposing 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 means for receiving 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 a time lag, respectively, 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.