Contact Image Sensor (Cis); Outline - Canon iR3570 Service Manual

Reader controller PCB
3.3V
OPT_MCK
CCW
MD_POW
CPU
M_ENABLE
RETURN
M_VREF
F-5-11
<Memo>
The scanning speed of this machine is as follows:
During copying (100%): 236 mm/sec
In SEND mode (600 dpi x 600 dpi):236 mm/sec
a.Forward Movement When Scanning an Image
To scan an image, the machine moves the contact image sensor (CIS) as follows by controlling the following motors:
Start position
Original leading edge
Acceleration
Shift
speed
[1] [2]
Shift distance
[1] used until the sensor reaches a speed suited to the selected mode.
[2] used as a margin to ensure a stable speed.
[3] used for reading the image at a specific speed.
[4] used for prompt deceleration and suspension once the image end is reached.
F-5-12
b.Reverse Movement After Scanning an Image
After scanning an image, the machine moves the contact image sensor (CIS) to shading position at a specific speed (147 mm/sec).

5.3.2 Contact Image Sensor (CIS)

5.3.2.1 Outline

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine uses a contact image sensor (CIS) to expose and read an image, and the image is read on a line-by-line basis.
Item
LED
Light guide
Rod lens array
CCD array
+5V +24V
J505
B*
1
B
Motor
2
A
driver
3
A*
4
Original
trailing edge
Normal speed
[3]
Description
serves as the source of light used to expose the original.
directs the light from LEDs to the entire length of a single image line of the
original.
collects light reflected by the original.
collects the reflected light coming through the rod lens array.
M501
Stop
Deceleration
[4]
T-5-4
Chapter 5
0006-5927
5-7