Optical inspection system aids car windscreen assembly

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Car manufacturers receive windscreens ready to use with seals, as well as with holders for rear view mirrors and a continuously growing number of sensors. Mirror and sensor holders are glued onto the windscreens and the prescribed amount of glue has to be deposited in precisely the correct position.

FiberVision has released the second generation of the 3D-Check, an optical inspection system for glue lines in the glass industry.

3D-Check is a laser scanner using the light-stripe technique. It creates a three dimensional image of the device under test and detects changes from the ideal geometry with high precision. The system uses two laser planes, which have an angle of 90° between them, and ensure high resolution in all three spatial axes. Thus, the holder is measured while it performs a fast linear movement that is independent from the specific holder type.

The 3D-Check is able to measure two holders independently from each other in one measurement run. This means in practice a robot may pick two different holders, e.g. one for a mirror and one for a rain sensor. The robot places glue onto the holders and moves them to the windscreen, passing the 3D-Check system on their way. 3D-Check measures the holders with the glue and the result is sent to the PLC via Profibus. The PLC can block bad holders being stuck onto the glass because it has the inspection results before the robot reaches the windscreen.

The system is modular and comes in two versions with identical box geometries. 3D-Check/80 uses two cameras and covers holders up to 80mm in width. The high-end version 3D-Check/160 is designed for holders which are up to 160mm wide. The systems uses four cameras and has a measurement speed of 130mm/s.

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