Patent ID: 6778282
Filing Date: 2004-08-17
Classification: G01B,G06T,H01L,H05K

Abstract:
A method for measuring respective positions of a set of N contact elements of an electronic component comprising:bringing said set of elements into a measurement plane; illuminating said set of elements in said measurement plane with a substantially homogeneous light source producing a light with an incident angle on said elements of at most 20Â°; recording a first image of said elements illuminated by said light source with a first camera having a first image plane extending substantially parallel to said measurement plane; recording a second image of said elements illuminated by said light source with a second camera set up over a triangulation angle &agr; with respect to said first camera and said measurement plane, said triangulation angle being situated between 25Â° and 80Â°; determining within said first image for each ith (1&lE;i&lE;N) element, a first image point X1 of a first reference point situated on each of said elements; determining within said second image a second image point X3 by mapping with respect to a calibration plane each time said first image point X1 into said second image; determining within said second image, a third image point X4 being the image of said first reference point; determining within said first image a fourth image point X2 by mapping said third image point into said first image; determining within said first image a displacement &Dgr;xi between said first and fourth image point, and determining from said displacement &Dgr;xi and said first image point the position of said ith element.