LED Lighting

CA-D series

Back Lights

CA-DS Series

CA-DS Series

Back light illumination techniques

Standard front lighting can cause inconsistent and low contrast of a targets features due to shape, colour and surface finish. Using a backlight ensures transmission of the light through the target into the camera. If the target is opaque a silhouette is generated creating a strong contrast and outline for stable inspection. Even if a target is transparent it may have a range of densities to it (such as layered material or liquid in a bottle). Contrast can still be achieved through the changes in the absorption and transmission of light in the target.

Addition of a large model the size of a piece of A4 paper

A large model the size of a piece of A4 paper has been added to the lineup. Light is emitted right to the edge of the unit, which makes it possible to install it with the minimum space necessary in terms of the lighting area.


Connector pin strip

With standard lighting

Some edge points are unclear and blend into the background.

With back light

Complicated outlines and edge points are clearly shown with a sharp contrast.

Shrink wrap defect detection

In this application example, the light is used as a specular light with a large lighting area.

Good product:
The camera is not affected by the background, and the shrink wrap appears flat.

Defective product:
A shadow is cast by the protruding part, which can be detected.



Back light intensity distribution (typical)

The above image displays the relative brightness across a 10000 point grid for the CA-DS Series. Although the intensity varies with each model type, the associated illumination distance and relative brightness across the area are consistent. The brightest areas (shown in red) are considered 100% relative intensity and the dullest areas (shown in green) are considered 0% relative intensity. The images display the intensity differential across the area. By comparing the changes in the intensity differential for different lighting heights (LWD) the ideal lighting range can be realised with the relative brightest points being 100%.

* The above data are representative examples. This is not a guarantee of the product quality.
* LWD is the distance from the illumination to the measurement target.

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