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Lighting
2-6
Lighting
A stable image must be obtained to ensure accurate inspection.
Use appropriate lighting for the application and the reading ob-
ject.
Lighting Methods
Back Lighting
A stable, high-contrast image can be obtained using back light-
ing.
Reflected Lighting
Ring Lights
Light is shone uniformly on the reading object. The difference in
reflection factors of the background and the marking enable
stable detection.
16
Applications: Transparent objects such as LCD glass
Camera
Reading object
(2-dimensional code)
Light source
Applications: Paper labels and corrugated cardboard
Camera
Reading object
(2-dimensional code)
Light source
Section
2-6
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