Omron V530-R150E-2 Operation Manual page 31

Lighting
Oblique Lighting
Detection is made by distinguishing regular and diffuse reflected
light.
Coaxial Lighting
A stable image with few shadows can be obtained of a reading
object with an uneven surface by detecting only regular reflected
light.
Applications: PCBs and electronic parts
Camera
Light source
Reading object
(2-dimensional code)
Applications: Mirror-like objects such as wafers
Camera
Light source
Reading object
(2-dimensional code)
Half mirror
Section 2-6
17