2-1-3 Optical section
(1) Scanner unit
4
5
10
3
6
7
2
Figure 2-1-10 Scanner unit
1. ISU top frame
2. ISU bottom frame
3. Contact glass
4. DP contact glass
5. Size indicator plate
6. ISU belt
7. ISU shaft
8. ISU gear 63/32
9. ISU motor
10. Image scanner unit (ISU)
9
2PK/2PL/2PM/2PN
8
1
2-1-6
2PK/2PL/2PM/2PN
(2) Image scanner unit (ISU)
The original image is illuminated by the LED and scanned by the CCD image sensor in the CCD PWB (CCD-
PWB) via the four mirrors and ISU lens, the reflected light being converted to an electrical signal.
If a document processor (DP) is used, the image scanner unit stops at the position of the DP contact glass and scans sequentially one row of the image on the original in synchronization with the moving timing of the original in the sub scan direction by driving the DP.
3
4
1
6
7
13
12
10
11
9
2
8
5
Figure 2-1-11 Image scanner unit (ISU)
1. Lamp mount
2. ISU housing
3. ISU reflector
4. Transparent material
5. Mirror A
6. Mirror B
7. Mirror C
8. Mirror D
9. ISU lens
10. CCD PWB (CCDPWB)
11. LED drive PWB (LEDDRPWB)
12. Home position sensor (HPS)
13. ISU shaft
2-1-7
2PK/2PL/2PM/2PN
SCPWB
YC103-6
LAMP
YC103-3
HPSW
YC104-
1,2,3,4
CON
PWB
SCMOT1A, SCMOT2B
SCMOT1B, SCMOT2A
ISUM
Original
Contact glass
Image scanner unit (ISU)
CCDPWB
LEDDR
PWB
LED
PWB
CCD image sensor
Mirrors and lens
HPS
Scanner unit
Figure 2-1-12 Scanner unit block diagram
2-1-8
2PK/2PL/2PM/2PN
(3) Laser scanner unit
The charged surface of the drum is then scanned by the laser beam from the laser scanner unit.
The laser beam (780 nm wavelength) beam is dispersed as the polygon motor revolves to reflect the laser beam over the drum. Various lenses and mirror are housed in the laser scanner unit, adjust the diameter of the laser beam, and focalize it at the drum surface.
7
4
5
3
2
1
6
Figure 2-1-13 Laser scanner unit
1. Polygon motor (mirror)
2. F-
lens
3. F-
lens
4. LSU mirror
5. LSU shutter
6. LSU frame
7. LSU cover
2-1-9
2PK/2PL/2PM/2PN
10
8
2
9
3
4
6
5
1
7
1. Polygon motor (mirror)
2. Laser diode (APC PWB)
3. Collimator lens
4. Cylindrical lens
5. F-
lens
Figure 2-1-14 Laser scanner unit
6. F-
lens
7. PD mirror
8. SOS lens
9. Pin photo diode sensor (PD PWB)
10. LSU mirror
2-1-10
