Inspection of cellular phone display windows
SINTEF has developed an inspection system for the quality control of printed text and mould defects in cellular phone display windows. This enables cost-effective production and reliable quality.
Mikron Oslo produces plastic mould cellular phone casings for the world market. The SINTEF developed system detects different print and mould defects such as missing ink and placement errors. Errors down to 1/100 mm can be detected by the system.
The system is based on contour matching of the text symbols with a template containing given tolerances. The tolerances of the template are learned by presenting flawless windows to the system.
This system was developed in co-operation with TORDIVEL AS for the Norwegian company Mikron Oslo AS.
For more information contact Mats Stefan Carlin
Fig. 1. Detecting print defects at the top of the letters ERI
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Fig. 2. Intensity plot of the letter R on a cellular phone display window.
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