Contact Image Sensor (Cis) - Canon imageRUNNER 2530 Service Manual

2
Technology > Original Exposure System > Controls > Contact Image Sensor (CIS)
1) Forward Movement during Image Scan
During image scan, operation of the contact image sensor (CIS) is controlled by controlling
the motor as shown below.
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 (123 mm/sec).
2 Technology > Original Exposure System > Controls > Contact Image Sensor (CIS)
Trailing edge
Stop
of original
Constant speed
Deceleration
[3] [4]
F-2-14 F-2-14

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 read line
Original glass
Rod lens array
LED (R/G/B)
CMOS 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.
CMOS 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
F-2-15 F-2-15
Function
2-8
T-2-4 T-2-4
2-8