Flatbed Scanner (hereinafter called Scanner) reads images and converts them into electrical signals.
Scanner is composed with document sitting Contact Glass & supporting scan cover ASSY, CIS ASSY,
Drive ASSY and the scan frame ASSY supporting them. Also, presence of slit glass on scanner is
determined by the presence of ADF on top of scanner, which distinguishes 3-in-1 model (no slit glass)
and other scanners. OP ASSY is assembled and mounted on the front of entire ASSY.
CIS ASSY has used CIS instead of reduction optical system (CCD module) that uses lens to reduce
machine’s size, the scanner’s thickness, and was able to lower its price. CIS optical system has compact
design and low price, but the depth of field gets significantly smaller than reduction optical system,
which has a disadvantage of having unclear scan image on glass not contacting parts.
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