CHAPTER 2
2 - 14
COPYRIGHT
2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 2-11 shows a cross-sectional view of the contact image sensor.
Figure 2-11
Figure 2-12
Phototransistor array
(Light receiver section)
Light reflector
section
Light conductor
section
Illuminated light
Rod lens array
Reflected light
Reading position
R
G
B
Scanning direction
LED
R
G
B
Image signal
Phototransistor
array
Phototransistor
array
Phototransistor
array
Phototransistor
array
Rod lens array
Sensor
drive
circuit
Image
signal
output
The contact image sensor for CanoScan N650U/N656U places 15 phototransistor arrays of
344 light phototransistors each in line, and the contact image sensor for CanoScan N1220U
places 15 phototransistor arrays of 688 light phototransistors each in line. Each
phototransistor converts the received light into an image signal and outputs the data per line
in series.