Patent ID: 7023591

Claim:
An image scanning apparatus, comprising: an illuminating device for illuminating an original document; a driving device for relatively transferring said original document and its image scanning position, assuming a plurality of areas where the transfer is to be performed at a long pitch, and a plurality of areas where the transfer is to be performed at a short pitch, included in each of the areas where the transfer is to be performed at a long pitch, said pitches being long or short in a sub-scan direction of said original document, sub-scanning said original document at least once in said areas where the transfer is to be performed at a short pitch, by performing a small step transferring, and then sub-scanning said original document by performing a large step transferring, the small step transferring being the transfer performed at a short pitch, the large step transferring being the transfer performed at a long pitch, and repeating the sub-scanning by performing the large step transferring and the small step transferring; and an imaging device having at least two line sensors with equal line intervals on the surface of the imaging device, for outputting a plurality of image data from each of the line sensors, the line sensors receiving light from said original document in a plurality of pixels, the image data representing received light intensity by each of the plurality of pixels.