Combining the wavelength conversion sheet, blue LED light, and blue cut filter create an absolutely new piece of light technology that can be used to realise back light images with reflected light.
It’s difficult to route cables when embedding light in a moving stage, but there are times when the contrast with just reflected light is insufficient. By using the wavelength conversion sheet, it’s possible to realise back light images without any wiring, which makes stable detections possible.
The contrast for the alignment mark is insufficient, so stable detection is not possible.
The contrast obtained is equivalent to that of images captured with back lights, which improves the alignment precision.
Assume that there is no space to install a back light when performing liquid surface inspections at a filling machine and that reflected light has to be used instead. Even if the light is installed in a narrow space, back light images can be realised by wrapping the wavelength conversion sheet around the rotating object.
Due to the effect of the reflection from the workpiece surface, it is not possible to obtain a stable view of the liquid surface.
Only the liquid surface is clearly imaged as a back light image, which makes it possible to perform stable liquid surface inspections.