How to Scan Documents on the Ricoh Copy Machine
The scanners that we have today often make use of a charge-coupled device (CCD) or a Contact Image Sensor (CIS) as the image sensor, while older drum scanners utilize a photomultiplier tube as the image sensor. A rotary scanner, used for high-speed document scanning, is another type of drum scanner, and this uses a CCD array rather than a photomultiplier.
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