Toshiba e-STUDIO2500c Service Manual page 85

The CCD for color processing has RGB filters provided over its surface, which allow the CCD to
read the light amount in the respective ranges of wavelength. The image data corresponding to the
respective RGB colors is then transmitted to the image processing section.
4) Data writing
Data writing is a process of converting the image signals transmitted from the image processing
section into light signals and exposing the drum surface with the light signal.
Namely, the image signals transmitted from the image processing section are converted into optical
signals (laser emission) by the semiconductor laser element, which are then used to expose the
drum surface, thus forming an electrostatic latent image there.
May 2006 © TOSHIBA TEC
( Example )
Value of image
CCD light
receiving signals to be
output
amount
Light 255
Dark
0
Fig. 3-8
Image
processing Y M
section
Polygonal mirror
Drum-Y Drum-M
Fig. 3-9
3 - 5
Difference between
"light " and "dark" is
divided into 256 steps.
C K
Laser driving
PC board
Semiconductor
laser element
Drum-C Drum-K
e-STUDIO2500c/3500c/3510c COPY PROCESS
3