Mitsubishi Electric KD Series User Manual page 19

2-2 Principal technology of CIS
【 How to acquire reflective light 】
Chart
Picture
White
Fig.1
Black
原稿 原稿 Paper
Sensor ICs
Illumination
光源 光源
Fig.3
TM-XG537C
Pixel
Fig.2
Saturated
Valid area
Lens
レンズ レンズ
ｾﾝｻｰIC ｾﾝｻｰIC
Incoming light intensity
Pixel
This clause explains how to acquire the raw
information of the light and convert into electrical
signal information.
・ When scanning a surface of the object, the illumination on
this product irradiates the object.
・ The object reflects the light. Generally the illuminated
black object reflects weaker reflective light. On the other
hand, the illuminated white object reflects stronger one.
・ Refer to the drawing on left side (Fig.1). The black and
white chart has a correlation with the reflected light
intensity.
・ The strong and weak reflective light arrives at the surface
of Sensor ICs (photo-diodes) through lens.
•As described in the drawing on the left side (Fig.3),
Sensor ICs correspondingly converts the strong and weak
light into the large and small electrical signal based on the
converting property of Sensor ICs as described on the
drawing on left side (Fig.2).
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