Contact Image Sensor (Cis) - Canon imageRUNNER 2270 Service Manual

Start position
Original leading edge
Acceleration
Shift
speed
[1]
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
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
Normal speed
[2]
T-5-4
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.
Original
trailing edge
[3]
Chapter 5
Stop
Deceleration
[4]
0006-5927
5-13