Contact Image Sensor (Cis) - Canon imageRUNNER 1750 Series Service Manual

2
Technical Explanation > Original Exposure and Feed System > Controls > Contact Image Sensor (CIS)
1) Forward Movement during Image Scan
During image scanning, the reader controller PCB controls the reader motor (M10) to
control the contact image sensor (CIS) operation.
Start Leading edge
position of original
Acceleration
Movement
speed
[1] [2]
Movement distance
[1] Acceleration area: The motor accelerates to the speed specified
for each mode.
[2] Runup area: A margin to stabilize the speed.
[3] Image read area: The image is read at a constant speed.
[4] Deceleration area: Upon detection of the trailing edge,
the motor decelerates rapidly and stops.
2) Backward Movement after Image Scan
After image scan, the carriage moves back to the contact image sensor (CIS) shading
position at the constant speed (160 mm/sec).
2 Technical Explanation > Original Exposure and Feed System > Controls > Contact Image Sensor (CIS)
Trailing edge
of original Stop
Constant speed Deceleration
[3] [4]
F-2-20

■ Contact Image Sensor (CIS)

● Outline
The original is exposed to light and read using the contact image sensor (CIS) to read the
image on a line-by-line basis.
Image reading line
Copyboard glass
Rod lens array
LED (R/G/B)
Original reading
sensor array
Light guide
LED
Component
LED Illuminates the original.
Light guide Illuminates the entire image line with the LED light.
Rod lens array Collects the light reflected by the original.
Original reading sensor array Receives the light that passed through the rod lens array.
Light guide
LED (R/G/B)
Scan direction
Rod lens array
Light guide
CCD
Function
2-12
F-2-21
T-2-7
2-12