Toshiba e-STUDIO453 Service Manual page 85

(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 direct-
ed 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 process-
ing 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
processing section into optical signal (laser
emission) to expose the drum surface and
form an electrostatic latent image on it.
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Fig. 3-204
(Example)
CCD light
receiving
amount
Light
Dark
Fig. 3-205
Image
processing
section
Polygonal mirror
Photo-
conductive
drum
Fig. 3-206
3 - 3 e-STUDIO350/352/353/450/452/453
CCD
Image processing sec-
tion
Value of image
signals to be out-
put
255
Difference between "light
" and "dark" is divided into
256 steps.
0
LDR board
Semiconductive
laser element
COPY PROCESS
3