	Machine Vision Systems

Detection of Concave and Convex, Prints on Curved Surface, and Contamination

Dome Lighting Bathes a Workpiece in Soft Indirect Light to Create an Image without Shadow or Halation

Detection of Print on Aluminum Packages

Print on aluminum packages, which is hard to detect due to shadows created by concave and convex areas and halation caused by film, are detected through the transparent film.

In the case of simple reflected light

Print on an aluminum package with simple reflection

The print cannot be identified due to diffused reflection.

In the case of dome light

The background image shade is eliminated and only the print appear.

Dome Lighting Technique

A dome light irradiates indirect light from various directions. In the case of workpieces with infinite form, shadows from concave and convex areas are easily apparent if irradiated by direct light from directly above and they are also prone to glare due to glossy surfaces. However, because this method can uniformly irradiate soft diffused light over such workpieces, this renders the surface even and improves the contrast between the detecting points and the background.

Uniform Light Irradiated on a Curved Surface Changes a Surface from Glossy to Flat

Detection of Holes and Black Scales

Holes and black scales left on a die-cast part following the processing of a curved-surface are detected.

In the case of simple reflected light

Detecting flaws on a curved surface with simple reflection

The position is not clearly detected.

In the case of dome light

Detecting flaws on a curved surface with a dome light

The surface is uniformly captured and defects can be detected.

Dome Lighting Technique

A dome light allows uniform light to be irradiated on any point of the curved surface. Unlike direct light, neither glare nor shadow occurs, allowing accurate detection.

	Page Top

Copyright(c) 2007 KEYENCE CORPORATION. All rights reserved.	\| Privacy \| Terms of Use \| Contact \| Produced by