Canon imageRUNNER 2525 Series Service Manual page 38

LED (R/G/B)
Component
LED
Light guide
Rod lens array
CMOS sensor array
● Analog Control Performed by the CIS
The flow of analog image processing performed by the contact image sensor (CIS) is as follows:
1. The light reflected by the original is collected by the rod lens array.
2. The light is received by the CMOS sensor array.
3. The CMOS sensor array converts the received light to an electric signal and outputs it.
The CMOS sensor array consists of four channels (units).
Each channel is provided with an output correction table to output an image signal after performing gain correction for the input
brightness signal.
Image read line
Original glass
Rod lens array
CMOS sensor array
Light guide
LED
Illuminates the original.
Illuminates the entire image line with the LED light.
Collects the light reflected by the original.
Receives the light that passed through the rod lens array.
Light guide
Scan direction
Rod lens array Light guide
CCD
Function
28
2. Technical Explanation
LED (R/G/B)