Technical Information
Differences in parallel light backlight effect

Effects from diffuser use

When a diffuser is used there is no longer a complete positional light source and light can be diffused around 3.2 degrees for irradiation. This makes it easier to adjust the angle during setup and provides more uniform images. However, there is larger light diffraction on the object which can possibly result in poorer measurement accuracy.

Injection syringe

Ordinary backlight

Light diffraction makes it possible to check surface condition and the inside

Backlight plus light control film

Provides an image somewhere in between an ordinary backlight and telecentric backlight

Telecentric backlight

The surface condition and inside cannot be checked because there is no light diffraction, but the profile is clearly visible, which emphasizes the edges

Spring

Ordinary backlight

Light diffraction makes it possible to check the surface condition with a telecentric lens that has a large depth of field. The profile is not clear and contrast is low

Backlight plus light control film

Provides an image somewhere in between an ordinary backlight and telecentric backlight

Telecentric backlight

The profile is clear because there is no light diffraction, making it possible to capture accurate measurements of dimensions

Ball bearing

Profile is visible using the backlight

Ordinary backlight

The inner side of the profile is illuminated and contrast low

Parallel light backlight

The profile is dark to the edges providing high contrast

Screw

Profile is visible using the backlight

Ordinary backlight

The profile part is not clear and contrast low

Parallel backlight

The profile is dark to the edges providing high contrast

Uneven plastic part (letters)

Letters visible using the back light

Ordinary backlight

The boundary is not clear and contrast is low

Telecentric backlight

The boundary is very clear and contrast high

TOP