INSPECTION OF LARGE SOLDERED JOINTS (LASOL)

D. Berndt, C. Steinmann

Abstract

The LASOL project comprises the development, evaluation and appraisal of a novel automated inspection system specifically designed for large area solder joints (LSJ). The LASOL project started in September 1998 and is co-funded by the Commission of the European Communities, DG XII, under its Brite/EuRam Program with the Project No. BE-4689. Current inspection systems based on grayscale imaging are usually optimized for very small joints (e.g. surface mount). These systems can check for the existence of a joint but provide inadequate information on its condition or quality. The LASOL system utilizes a non-destructive method based on the Coded Light Approach to optically inspect the joint surface in three dimensions. With this method the LASOL team intends to achieve: establishment of generic relations between geometric structures and quality functions (e.g. fluid and gas tightness or mechanical strength); definition of generic rules for process control using geometric measurement data; set-up and validation of an industrial pre-competitive prototype for automated inspection of LSJ’s. Actual results of topography registration, classification and rules of quality assurance of LSJ’s are presented.

Keywords

3D optical measurement, coded light approach, quality assurance, closed quality control, solder joints, classification, rules

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