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(3) Data reading (scanning)
Data reading is the process of illuminating the
original with light and converting the reflected
light into electrical signals.
The light reflected from the original is directed
to the charge coupled device (CCD) and this
optical image information is converted into
electrical signals (image signals), which are
then transmitted to the image processing sec-
tion.
CCD
Image processing
section
(4) Data writing
Data writing is the process of converting the
image signals sent from the image process-
ing section into optical signal and exposing the
drum surface with the light.
Semiconductive laser element converts image
signals transmitted from the image process-
ing section into optical signal (laser emission)
to expose the drum surface and form an elec-
trostatic latent image on it.
Image
processing
section
LDR board
Semiconductive
laser element
Polygonal mirror
Photo-
conductive
drum
Fig.3-204
Fig.3-206
(Example)
CCD light
receiving
amount
Value of image
signals to be
output
Light 255
Dark 0
Difference between
"light " and "dark" is
divided into 256 steps.
Fig.3-205