2-6
Section
Lighting
16
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.
Applications: Transparent objects such as LCD glass
Camera
Reading object
(2-dimensional code)
Light source
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.
Applications: Paper labels and corrugated cardboard
Camera
Reading object
(2-dimensional code)
Light source
