LED Lighting

CA-D series

Wavelength Conversion Sheet

CA-DWC Series

CA-DWC Series

Wavelength conversion sheet features

Wavelength conversion mechanism

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.

With only the ambient light

This is the image obtained when the white workpiece is placed on top of the wavelength conversion sheet and the white sheet.

Install a blue bar light.

This is the image obtained when the blue light is emitted. The white background and the white sheet are imaged in blue. The waveform conversion sheet converts the blue light to an orange colour tinged with red and reflects this colour.

In addition, install a blue cut filter on the lens.

The blue cut filter cuts out the reflected light in the blue range, and only the light from the wavelength conversion sheet enters the lens. In this way, an image like that captured of the white workpiece with a back light is obtained.



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.

Using only blue reflected light

The contrast for the alignment mark is insufficient, so stable detection is not possible.

Using the wavelength conversion sheet

The contrast obtained is equivalent to that of images captured with back lights, which improves the alignment precision.

Liquid surface inspection

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.

Using only blue reflected light

Due to the effect of the reflection from the workpiece surface, it is not possible to obtain a stable view of the liquid surface.

Using the wavelength conversion sheet

Only the liquid surface is clearly imaged as a back light image, which makes it possible to perform stable liquid surface inspections.



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