A Contact Image Sensor (CIS) was developed for a flatbed type facsimile, image scanner, photocopier etc. It is made up of multichip sensor ICs and a new lens array, in place of the Rod Lens Array (RLA) used previouly. Therefore, the Depth Of Focus (DOF) problems which had previously occured in the flatbed CIS were eliminated, due to an improved DOF obtained by using the new lens array. The sensor unit size was virtually the same as in the previous series. The advantage of flatbed type machines is that they can be miniaturized, simply assembled, easily maintained and so on.
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