Canon IMAGERUNNER 2530, Service Manual

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Technology > Original Exposure System > Controls > Contact Image Sensor (CIS)
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
position
Acceleration
Leading edge
of original
Constant speed
Trailing edge
of original Stop
Movement
speed
Movement distance
[1] [2] [3] [4]
[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.
Deceleration
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).
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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.
LED (R/G/B)
LED (R/G/B)
LED
CCD
Light guide Light guide Rod lens array
Light guide
CMOS sensor array
Rod lens array
Image read line
Original glass
Scan direction
Component Function
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.
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