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Principal Technology Of Cis - Mitsubishi Electric KD Series User Manual

Contact image sensor, web surface inspection
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2-2 Principal technology of CIS

【How to acquire reflective light】
Chart
Picture
White
Fig.1
Black
原稿
原稿
Paper
Sensor ICs
光源
光源
Illumination
Fig.3
TM-XJ959A
Pixel
Fig.2
Valid area
Saturated
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 charts have 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).
19
© Mitsubishi Electric Corporation

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