System for Accurately Aligning and Testing "N" Pairs of Points Making Up a Circuit Line Image
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15
In the manufacture of printed circuits on cards, boards or substrates of glass or ceramics, the circuit lines must be compared with the lines, as designed, to determine whether there is any misalignment. The circuit of Fig. 1 operates using a scan, combine and compress function to average any desired number of "two point" alignments. (Image Omitted) The axes of four components in Fig. 1 need to be aligned to ensure good results, and these four are: the reference image, the x,y table, the camera and the "part" under test. The coordinates of the "reference image" can be assumed to be correct, i.e., perpendicular and free of distortion, because usually this is determined from design data. The mounting of the x,y table provides a physical reference against which the coordinates of the camera and the "part" under test are matched.