(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.

CCD

Image processing sec-

tion

Fig. 3-204

(Example)

 

 

 

 

CCD light

 

Value of image

 

receiving

 

signals to be out-

amount

 

put

 

 

 

 

 

 

Light

 

255

 

 

 

 

 

 

Difference between "light

 

 

 

 

 

 

 

 

" and "dark" is divided into

 

 

 

 

256 steps.

 

 

 

 

 

 

 

 

 

 

Dark

 

0

 

 

 

 

 

Fig. 3-205

 

 

 

3

(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.

Image

processingLDR board section

Polygonal mirror

Semiconductive laser element

Photo- conductive

drum

Fig. 3-206

© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved 3 -

e-STUDIO350/352/353/450/452/453

 

COPY PROCESS

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Toshiba 453, 452, 350, 353 service manual Image processing sec Tion Example CCD light Value of image
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350, 353, 453, 452 specifications

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