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Addition of a contrast medium, to a component already present in automated manufacture, facilitates inspection by robot systems.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
55% of the total text.
Page 1 of 1
A Contrast Improvement Automated Electronic Card Assembly
Addition of a contrast medium, to a component already present in automated
manufacture, facilitates inspection by robot systems.
The Figure shows a system to place planar integrated circuit modules on a
printed circuit board. The system includes a typical printed circuit board (1),
printed circuit wiring (2), a solder mask (3), with openings (4) to the printed circuit
wiring, solder paste (5), and the integrated circuit module (6). A typical assembly
technique is to align the integrated circuit (6) to its printed circuit wiring (2)
pattern while simultaneously viewing the assembly by viewer (7) under visible
light lamp (8), using vision information to make positional corrections where
necessary. A problem is contrast from the image of the printed circuit board
pattern relative to the background lighting as seen by the vision system. Adding
UV fluorescent ink to the solder paste (5) and using an ultra-violet lamp (8),
provides visible light beams (9) for use in positioning.
This technique improves the image contrast in the regular manufacturing
process. The manufacturing steps for placing the components on the board are
as follows: (1) The printed circuit wiring pattern, usually copper, is placed on the
board by photo-lithography. (2) A polymer solder mask is then placed over the
printed circuit board pattern leaving holes in the mask where soldered
connections are to be made to the circuits. (3) A solder p...