Sharp MX-2314N, Руководство по обслуживанию

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MX-3114N OPERATIONAL DESCRIPTIONS 13 – 3
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 3-line (RGB) CCD ele-
ments to be converted into analog image signals.
2) The analog image signals are converted into 10-bit digital sig-
nals by the A/D converter.
3) The digital image signals are sent to the scanner control PWB
for image processing.
(2) Detailed descriptions
a. Optical section drive
The optical section is driven as follows: The drive power is transmit-
ted from the scanner motor (MIM) through the belt to the drive pul-
ley/wire, and the copy lamp unit and the mirror base which are
attached to the wire are driven.
The scanner motor (MIM) is controlled with the signals sent from
the scanner control PWB.
b. Scanner lamp drive
The scanner lamp is driven by the scanner lamp drive voltage
which is generated by the scanner lamp drive PWB with the control
signals sent from the scanner control 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 3-line (RGB) CCD elements to
be converted into analog image signals.
The color components are extracted into R, G, and B by the three
kinds of CCD elements (R, G, and B).
The red CCD extracts the red component of an image, the green
CCD extracts the green component, and the blue CCD extracts the
blue component. This operation is called color separation.
The CCD element is apparently seen as one unit, but it includes the
three kinds of elements (R, G, and B).
The CCD element scans the document in the main scanning direc-
tion. 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 scanning direction is 600dpi.
Image data of one line
d. Image signal A/D conversion
1) Each image signal (analog) of R, G, and B is converted into a
10bit digital signal by the A/D converter in the CCD PWB.
Each color pixel has 10bit information.
2) Each 10bit digital image signal of R, G, and B is outputted from
the CCD PWB and sent to the SCU PWB, where it is con-
verted into an 8bit signal and sent to the MFP PWB.
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
performed by the image process technology (software).
B
R
G
R
G
B
Red component
image data Blue component
image data Green component
image data
R G B
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