Reduction optical system through lens composes optical system composed with various mirrors &
lenses, illuminator and imaging system to implement conjugate field of configured lens in a space. In
comparison, CIS is composed as one part with lens, imaging system (imaging sensor) and illuminator.
Also, in comparison to forming the reduced image information read from one line of main scanning
direction on scanning sensor, CIS forms images on serial sensors of corresponding point’s images to scan.
Also, color scanner’s reduction optical system reflects white lights from illuminator to paper and scans
information of each color with image information formed on each channel with these reflections via
optical paths, but for CIS, illuminator lights each color channel to have one sensor to read the reflected
lights from document to define colors of each channel.
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