December 2002 TOSHIBA TEC 3 - 3 e-STUDIO160/200/250 COPYING PROCESS
(3) Scanning:
"Scanning" is the process of directing light at
the original, and converting light reflected from
the original to electrical signals.
Light reflected from the original is picked up by
a CCD (charged coupled device), the image
information held by that light is converted to
electrical signals (image signals), and the im-
age signals are sent to the image processor.
(4) Printing
"Printing” is the process of converting the im-
age signals sent from the image processor to
optical signals, and exposing these optical sig-
nals on photosensitive drum.
Image signals from the image processor are
converted to optical signals, and these optical
signals are exposed by a semiconductor laser
to form a static latent image on the photosen-
sitive drum.
03005
CCD board
Scanner control PC
board
Image processor
(Example)
Light intensity
at the CCD
photodetector
Light
Dark
Value of
signals to be
output
255
0
Contrast (differ-
ences in light and
dark) is divided
into 256 steps.
Image
processor
Printing
controll block
Photo-
sensitive
drum
03006
Polygonal mirror
Semiconductor
laser
Fig. 3-2-4
Fig. 3-2-5
Fig. 3-2-6
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