ScanVision™ System Applications
HYLAX proprietary ScanVision™ Laser system incorporates vision camera system, in-line with laser beam path, through the galvanometers beam positioning system. Realtime Vision compensation for workpiece drift or fiducial find accurate to a few microns tolerance can be achieved at blinding speed of a few milliseconds in laser processing systems(welding, marking, cutting, drilling etc.).
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ScanVision™ Application Showcase
With the availability of the ScanVision™ technology, numerous applications that were previously time consuming and/or complicated were very much simplified. Below are some applications that have benefitted from this technology, with many more still to be discovered.
TFT/LCD Titler : Marking 2D Matrix on TFT Panel
FPDs are usually manufactured in big glass panels with each big panel having a number of subpanels. Panel IDs in the form of text and 2D matrix are needed to be marked on pads as small as 0.8mm in height in each sub-panel. The ScanVision™ achieves an accuracy of +/-15 microns at high speed by using galvo movement for the fiducial find, position drift compensation, laser mark and mark verification in each marking location, instead of numerous X-Y stage movements needed by other types of laser solutions, or the more traditional photo mask method that requires more processes, takes up more time and yet offers a lower yield.
TFT LCD tEST CIRCUIT TRIMMING
Test Circuits are built into LCD panels for the final test. After testing, the tracks of the test circuit have to be trimmed off. As the panels can be quite small, the accuracy requirement can be as high as +/-10 microns. Traditional systems use an external vision to locate the position of the trim and a high-precision X-Y stage to move the panel under a fixed optics laser to trim the circuit. As the fiducial find and trimming are accomplished by movement of the X-Y stage, the cycle time is long. The ScanVision™ achieves high precision and speed by using galvo mirror turning movements to perform fiducial find, drift compensation, laser mark and post-trim check (to ensure a clean cut) almost simultaneously, increasing the throughput of traditional systems three-fold.
IC Wrong orientation check & Marking
Before laser marking, ICs in tray form need to be inspected to ensure the correct orientation of each IC, as they will be packed into tapes after laser marking. Traditional systems employ external vision inspection of the whole tray before laser marking through movement of X-Y stage. As the vision FOV is small, inspection takes a long time. The ScanVision™ utilizes the fast galvo movements to cover a large area at high speed for inspection and proceeds to mark immediately after inspection without any additional tray movement.
IC Add-on MaRK
Certain pre-marked ICs need to have the test grade marked onto the mould compound. Traditionally, the add-on mark can land anywhere on the IC, at times even overlapping with the existing mark. The ScanVision™ is able to identify the location of the existing mark and add the new mark onto the IC in alignment with the existing mark.
Crystal TrimminG
Quartz crystals such as those used in watches can be trimmed with a laser to achieve a specific resonance range. As the parts are very small, traditional means of trimming makes use of a fixed optics laser with a precision stage and external vision for the process, so as to achieve the required accuracy of +/- 15 microns, but this method yields a low throughput. The ScanVision™ with the fast galvo movement, is able to identify the trim location and perform the trim almost simultaneously, with the required accuracy, delivering a throughput more than double the original.
Laser surface polishing 
Laser polishing was performed on very minute components of the HDD suspension. The ScanVision™ is able to capture the polish location quickly, and perform the positioning compensation and laser polishing at a very high speed. Upon completion of the polishing, post-inspection is done to ensure polishing is done properly, and to detect any material defects, which can only be detected when the surface is polished.
PRECISION MICRO WELDING
HDD suspensions consist of a few layers of material that need to be welded together. As the parts are small, and the accuracy required is high, traditional systems employ a fixed optics laser with a high precision X-Y stage to perform the weld. Depending on the type of suspension, each type typically have an average of 20 weld spots, and are loaded in trays, each tray having a number of units. Considering the many movements needed to cover 1 tray, with each spot requiring 1 movement, time taken to complete 1 tray can be quite long. With the ScanVision™, the high speed movement of the galvos allows the weld to be done at 4x the speed of traditional systems, and yet maintaining a +/-5 microns accuracy.
