MX-C250 OPERATIONAL DESCRIPTIONS 11 – 7
B. Outline
This section performs the following functions.
1) Light is radiated to the document by the scanner CIS lamp,
and the contrast of the reflected light is read by the CIS ele-
ments into the image signal (analog).
2) The image signals (analog) are converted into 16bit digital sig-
nals by the A/D converter.
3) The image signals (digital) are sent to the image process sec-
tion (scanner control PWB).
C. Optical section drive
The CIS unit in the optical section is driven by the scanner motor
(MIM) through the belt.
The scanner motor (MIM) is controlled by the drive signal sent from
the MFPC PWB.
D. Scanner lamp drive
R, G and B LEDs are mounted. These LEDs lights in order of R, G,
B, R, G, B, ...... with the color scanning. These LEDs light at the
same time with the lighting ratio set in SIM63-12 with the mono-
chrome scanning.
E. Image scan/color separation
Light is radiated to the document by the CIS unit, and the contrast
of the reflected light is read by the on line CMOS elements to be
converted into the image signal (analog).
The color components of document images are extracted to R, G,
and B separately by the one line CMOS elements (R,G,B).
The inside of the LED element contains the R, G and B elements.
The document scan in the main scanning direction is performed by
the CMOS element. The document scan in the sub scanning direc-
tion is performed by shifting the carriage unit with the scanner
motor.
The scan resolution is 600 dpi.
F. Image signal A/D conversion
1) The image signal (analog) for each of R, G, and B is converted
into 16bit digital signal by the A/D converter.
Each color pixel has 10bit information.
2) The 16bit digital image signals of R, G, B are sent to the image
process section.
G. Zooming operation
Zooming in the sub scanning direction is performed by changing
the scanning speed in the sub scanning direction and using the
image process technology (software).
Zooming in the main scanning direction is not performed optically,
but performed with the image process technology (by the software).
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