	Machine Vision Systems

Detection of Scratches and Chips on a Low Contrast Surface

Low Angle Lighting Clearly Shades Small Edges, Concave and Convex Areas

Detection of Rubber Packing Chips

Detection of chips around circumference, scratches or areas of uneven thickness which may occur during the molding process are difficult to identify visually due to the lack of contrast.

In the case of simple reflected light

The chips around the circumference are undetected.

In the case of low-angle light

The chips around the edge stand out.

Low Angle Lighting Technique

With the low angle method, the workpiece edge is irradiated from a low angle. Although direct irradiation from the top causes the light to diffuse and makes it hard to detect the edges, by irradiating the edge surface at an angle, the contrast of concave and convex at the edge can be photographed and detected.

Set-up for oblique lighting with a ring light

Coaxial Illumination Captures the Light of a Smooth Surface and Releases the Light over Concave and Convex Areas to Create a Shadow

Detection of Defects on Embossed Tape

This device detects defects such as any collapse or tear at the bottom of the embossed tape case.

In the case of simple reflected light

Detecting defects with regular illumination

The reflection is uneven and defects are not easily identified.

In the case of coaxial vertical illumination

Detecting defects with coaxial illumination

Only defective parts are projected as a shadow.

Coaxial Vertical Illumination Lighting Technique

The coaxial vertical illumination method irradiates light from the same axis of the lens. By irradiating regular reflected light from the glossy surface and releasing diffused light at the edges of an engraved mark, the light and shade of the object can be captured and detected.

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