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19
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).
【
How to acquire reflective light
】
2-2 Principal technology of CIS
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Valid area
Saturated
Incoming light intensity
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Pixel
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Picture
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レンズ
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光源
原稿
レンズ
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光源
原稿
Illumination
Sensor ICs
Lens
Paper
Fig.1
Fig.2
Fig.3
TM-XJ959A