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Alignment Systems |
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Overview
These systems eliminate registration problems associated with using substrate edge or PCB tooling holes for alignment. AVISAS and both u-Lign™ systems use 2 high-resolution CCD cameras, fluorescent or LED lighting of the alignment area, and robust camera mounts with smooth X,Y motions and locks. Cameras may be straight up-and-down or independently angled at 10º to accommodate fiducials in close proximity to each other. |
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This automatic system works with PC-controlled printers MSP-886PC, MSP-1005PC, MSP-9156PC, MSP-1826PC, and MSP-2406PC.
Registration marks (fiducials) on the substrate can be of any shape. The system is setup based on an actual wet print which takes screen/stencil stretch and snapoff into account during production. A "best fit" method comparing the calculated center of the two substrate fiducials with the stored center of the screen fiducials (learned during setup) is used to align the screen during the production run. |
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| Complete alignment time including fiducial location, correction calculation and movement of the screen/stencil positioner is typically <3 seconds. Absolute accuracy can be ±0.001" with repeatability to ±0.0005". AVISAS IV is integrated with the printer control system and can sense if CCD camera positions have been changed without changing the alignment setup. |
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This PC-based system permits use of part of the actual board pattern for precise fine pitch and fine line printing. It works with all AMI printers with an adjustable workholder.
u-Lign IV incorporates four different alignment methods:
- Image Overlay
- Boundary Tracking
- Circles
- Dual Crosshairs |
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Other capabilities include automatic print cycle lockout if preset tolerances are not achieved and measurement of the distance between any two board pattern features.
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This practical and economical system uses two single- or double-crosshair targets for board alignment with greater accuracy than possible by mechanical features or fixturing of the board. Like the u-Lign IV, it works on all AMI printers with an adjustable workholder. Click image at right to enlarge. |
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| The crosshairs can be adjusted black to white, dotted or solid to provide the highest contrast for the operator performing the alignment. |
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Available as an option on AMI printers with an adjustable workholder. The jig allows an operator to make a test print on the mylar sheet held in a frame mounted on the workholder. Workholder X, Y, and Ø adjustments are used to align the board to the test print on the mylar, and then the workholder is locked in that position. The operator removes the jig and production printing begins. |
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