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B.Operational descriptions
(1)General
This section performs the following operations.
1) Light is radiated onto the document by the scanner lamp and the
reflected image is scanned by the 3line (RGB) CCD elements to be
converted into analog image signals.
2) The analog image signals are converted into 10-bit digital signals
by the A/D converter.
3) The digital image signals are sent to the SCNcnt PWB for image
processing.
(2)Detailed descriptions
a. Optical section drive
The optical section is driven as follows: The drive power is transmitted
from the scanner motor (MIRM) through the belt to the drive pulley/
wire, and the copy lamp unit and the mirror base which are attached to
the wire are driven.
The scanner motor (MIRM) is controlled with the signals sent from the
MCU PWB.
b. Scanner lamp drive
The scanner lamp is driven by the scanner lamp drive voltage which is
generated by the LED drive PWB with the control signals sent from the
SCNcnt PWB.
c. Image scan and color separation
Light is radiated onto the document by the scanner lamp and the
reflected image is scanned by the 3line (RGB) CCD elements to be
converted into analog image signals.
The color components are extracted into R, G, B by the three kinds of
CCD elements (R, G, B).
The red CCD extracts the red component of an image, the green CCD
extracts the green component, the blue CCD extracts the blue compo-
nent. This operation is called color separation.
The CCD element is apparently seen as one unit, but it includes the
four kinds of elements (R, G, B).
The CCD element scans the document in the main scanning direction.
Scanning in the sub scanning direction is made by shifting the scanner
unit with the scanner motor.
The document images are optically reduced by the lens and reflected
to the CCD.
The scan resolution is 600 dpi.
R,G,B Color filter
3LINES CCD UNIT
CCD Elements
MX-M316N OPERATIONAL DESCRIPTIONS 11 – 12
(Image data for 1 line)
R
Red component
Green component
image data
image data
d. Image signal A/D conversion
1)
The image signal (analog) for each of R, G, and B is converted
into 10bit digital signal by the A/D converter.
Each color pixel has 10bit information.
2)
The 10bit digital image signals of R, G, B are sent to the image
process section.
CCD PWB
Analog IC
CCD
R
G
B
Buffer
e. Zooming operation
Zooming in the sub scanning direction is performed by changing the
scanning speed in the sub scanning direction.
Zooming in the main scanning direction is not made optically, but per-
formed by the image process technology (software).
R
G
B
G
B
Blue component
image data
AFE ADC
LVDS
Timing
Generator
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