User Guide

80 Chapter 4 - Operational overview EN
Scanner and ADF functions and operation
Scanner Functions
The scanner uses a light source, a color-separation method, and a
Charge Coupled Device array (CCD) to collect optical information
about the document and transform that into an image file. The
scanner consists of:
 a lamp (cold fluorescent bulb)
 five mirrors and a lens
 a CCD
Figure 11. Optical diagram of scanner
The scanner lamp illuminates a small strip of the document (called
the
raster line). The light is directed via the mirrors through the lens to
the CCD. The CCD senses and records the light, creating an analog
representation of the raster line. If using the ADF, the document then
advances in the ADF to the next raster line. If using the flatbed, the
scanner module advances to the next raster line. This advancing and
collection process continues up to the end of the sheet.
Lens
CCFL Lamp
Scanner Glass
600 ppi CCD