| 摘要 |
<p>Apparatus for optically scanning a document and in so doing generating digital image data corresponding to local optical densities of the document, comprising a fixed glass plate, one side of which defines an original plane, transport means for transporting the said document in a sub-scanning direction in the original plane, at least two linear sensors situated in a main scanning direction, each comprising an array of opto-electrical converters and each provided with a lens which images on the sensor a linear observation area, situated in the original plane, the observation areas of the sensors being substantially in line and partially overlapping at the ends in the main scanning direction, an aligning element situated between the lenses and the original plane at a short distance from the latter in a position such that its perpendicular projection on to the original plane is situated within the overlapping ends of two adjoining observation areas, wherein the aligning element has a shape such that for each sensor in whose observation area it is situated the aligning element has a width in the main scanning direction which increases or decreases continuously as a function of the sub-scanning direction. <IMAGE></p> |
