In one example, a document scanner having a document-receiving platen. The platen includes a plurality of alignment patterns disposed on the platen at known positions in a coordinate system. The scanner includes overlapping staggered scan bars disposed adjacent the platen, each scan bar fixed at a position to image a one-dimensional slice of a corresponding one of the alignment patterns. The scanner further includes a controller to determine, from the imaged slice, X and Y coordinates of each corresponding scan bar within the coordinate system.

This optical scanning method yields a high quality image regardless of the size of the scanning area. An emission end of an optical fiber is displaced two-dimensionally to scan light emitted from the optical fiber, the emission end being displaced by an optical scanning actuator that includes a first driver and a second driver for driving the emission end in different directions. A non-circular scanning area is scanned by controlling, with a driver controller, a first drive signal supplied to the first driver and a second drive signal supplied to the second driver so as to rotate a scanning pattern of the light, while causing the scanning pattern to reciprocate repeatedly in a nearly parallel manner, and to change a length of the scanning pattern in accordance with a rotation angle of the scanning pattern.

An example scanner assembly includes a housing formed with corners to allow an image sensor line to align cornerwise. An example scanner apparatus may include a plurality of scanner assemblies with an image sensor line oblique to the media advance direction.

An example scanner assembly includes a housing formed with corners to allow an image sensor line to align cornerwise. An example scanner apparatus may include a plurality of scanner assemblies with an image sensor line oblique to the media advance direction.

In one example, a document scanner having a document-receiving platen. The platen includes a plurality of alignment patterns disposed on the platen at known positions in a coordinate system. The scanner includes overlapping staggered scan bars disposed adjacent the platen, each scan bar fixed at a position to image a one-dimensional slice of a corresponding one of the alignment patterns. The scanner further includes a controller to determine, from the imaged slice, X and Y coordinates of each corresponding scan bar within the coordinate system.