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Applications
The image overlay display can be used to show numerous changes from the stored standard grayscale image.
- Alignment: The stored image is made from an image of the current printing operation that production parts are to be aligned to. This is best done by having coincident features on the production part and the print pattern being applied. One common method of performing this is through the use of a transparent plastic cover sheet. The work plate is covered with a sheet of flexible plastic and a test print is performed. The image on the plastic is then captured by the framegrabber and stored for reference. The sheet is removed and the production part is placed on the work plate. The live image of the production part is then displayed with the overlay of the stored test print image. The production part can be moved until the overlaid print pattern coincides with the corresponding image on the production piece. Alternatively a careful setup can be done on the first part until it is properly aligned and an image of the aligned part stored by the framegrabber. Each part that is loaded in to the machine can be visually aligned to the overlay until it is centered exactly with the image of the first carefully aligned part. Fringes of red or green show where the misalignment needs to be corrected. Two cameras can be used to display two images on the screen from opposite corners of the part to assure alignment in X, Y and Theta.
- Component Integrity: Comparing the production part to the golden standard image can highlight discrepancies. Solder bridges will appear highlighted. Missing components will be marked by red or green highlights depending on whether the missing component was light or dark. Misaligned components will display red or green fringes according to the amount of misalignment.
Bare boards: Printed circuit boards can be inspected for underetching or overetching. Mousebites and projections will be highlighted in red or green where they differ from the golden standard stored image.
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