Scanner component
The bright and dark areas of a scanned document reflect different light values from the light source
(CCFL), and the light emits through the lens in the scan head. When the CCD sensors receive the light,
photoelectricity is produced according to the light strength. The CCD and CCB/B change the light into
electricity, and then the CCD/B transmits the analog electrical signal through the R, G, B channels. The
analog signal (R,G,B) is sent to the to the A/D converter, which converts the analog signals to digital
signals. The ASIC reads the digital data produced by the A/D converter, and then processes the read
data in the inner ASIC.
NOTE The same optical system is used for the glass and ADF scans.
scanned document
AFE(A/D) ASIC
(Mirror)
light source
Interface chip
Printer engine
AUTOMATIC DOCUMENT FEEDER
ADF Feeder
ADF Motor
Control Board
Input Tray
Sensor
ADF Media
Size Sensors
SCANNER SYSTEM
Scanner Controller Board
Scan Carriage
Carriage Drive
System
Flatbed Cover
Sensor
Flatbed Media
Size Sensors
CCD Driver
and Analog
Processor
Optical Path
(Mirrors and Lens )
Scanning
Lamp
DOCUMENT
x
x
x
Copy Processor Board
and Formatter
x
x
Image Data
Sensor signal
x
Scan command
148 Chapter 4 Theory of operation ENWW
To Next Page
Loading...