: Feb. 6 2004
1
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 91
C. Operational descriptions
(1) CCD/lens unit
This machine employs the reduction optical-type line CCD (Charge
Coupled Device) of scan resolution of 600dpi and 7400 pixels.
CCD scan is performed by shifting the scan positions sequentially by the carriage unit (lamp and mirror) scan or moving the document with the SPF.
Lights reflected by the document are reflected by each mirror to form images on CCD elements through the reduction-type lens. The CCD converts the
optical energy into electrical energy (analog). (Photoelectric conversion)
(2) CIS unit
The image sensor which scans back document images is attached to the SPF. The close-contact type image sensor (Contact Image Sensor) with
scan resolution of 600dpi and 7196 pixels is employed.
For the CIS to scan documents, the scan position is sequentially shifted by shifting the document by the SPF, and the LED light in the unit is radiated
to the back of the document, and photo energy is converted into electric energy (analog signal).
(3) Image signal flow
The image signal converted into electric energy (analog signal) is A-D
converted on the CCD PWB. Image processes such as white balance
and shading correction are performed on the scanner control PWB.
The image signal is then sent through the mother board to the MFP
control PWB.
In the MFP control PWB, image process is performed according to the
setting content of the operation panel. The image data are converted
into laser lighting signals (VIDEO signals), and sent through the mother
PWB and the PCU to the LSU (Laser Scan Unit).
In the LSU, the VIDEO signals are converted into laser beams, which
are radiated onto the drum.
Code Signal name Name Function/Operation Type Model Note
MIM MIM Scanner (reading) motor Drives the scanner (reading) section. Stepping motor
MHPS MHPS Scanner home position
sensor detector
Scanner home position detection Transmission type Sensor
CIS unit CIS unit Contact-type image scan sensor unit
Back document image scan
CCD PWB CCD PWB Front document image scan (Document
table/SPF mode)
Converts the document images (optical
signals) into electrical signals.
No. Name Code, signal name Function
1 Scanner home position sensor MHPS Scanner home position detection
2 Scanner (read) motor /MIMDA Drives the scanner (read) section.
3 Scanner drive belt Transmits the scanner motor power to the scanner unit.
4 Pulley Drives the scanner drive wire.
5 Lens Reduces the document images (optical) and radiates them onto the CCD.
6 Scanner drive wire Transmits the scanner motor power to the copy lamp unit and the mirror base unit.
7 Reflector Converges the copy lamp lights.
8 Scanner lamp CL1 Radiates lights onto the document. (Xenon lamp)
9 No. 3 mirror Assures the optical path from No. 2 mirror to the CCD.
10 No. 2 mirror Assures the optical path from No. 1 mirror to No. 3 mirror.
11 SPF (CIS) white balance sheet /
SPF scan glass
The white reference sheet for scanning with the CIS unit.
Lens center line
Focus point
LED PWB
CIS
CIS UNI
Selfoc lens
Glass
1
To Next Page
Loading...
