发光二极管 LED金线的注意事项.ppt

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发光二极管 LED金线的注意事项

1999.1.20 作成 Quality Assurance Section 1996.7.15 作成 Contamination of Bonding Wire General Sticky Problem Wire was disheveled by surface touch. Club Ball If wire is contaminated, molten ball move to high temperature side during spark and form a club ball. Bonder stop due to Spark Error Sometimes, contaminated wire forms too small ball to stop at the capillary tip after clamper release the wire the capillary. Then bonder will stop due to spark error. Reliability Contaminated wire can complete bonding to the Pad, but the contamination still remain on wire surfaces. * Tanaka Kikinzoku International K.K. Taipei Liaison Office Contamination of bonding wire may cause problems such as follows. Kink and/or Sticky wire. Bonder stop due to wire broken. Bonder stop due to the Spark Error. Club ball Variation of ball diameter Others Cause of Contamination Contamination are mostly human related. It sticks to the bonding wire surface when contacted. This will occur even if gloves or finger cots are worn. Contact by Finger Contamination Damage Touch Mark Draw wire x32 Draw wire x100 Magnification By Metal Microscope By SEM image Touching Mark Process of Kink by Finger Touch Press surface by Finder Draw wire get into a Bottom surface. “STICKY” Pull a wire KINK Wire x500 x700 Contamination Club Ball Identification Contamination of wire is not so difficult to identify. If wire is contaminated, sparking color are different. Normal Wire Contaminated Wire Spark Color is Blue Purple Touch Spark Color is Orange Touch x500 x500 Spark Error Mechanism Wire have Tension Wire have Tension Stick! Normal Wire Contaminated wire Mechanism of “Spark Error” during Bonding Operation as follows, Magnification Contamination is not only Wire Contamination of Guide Contamination of Clamper Contamination of Capillary If wire is contaminated, The wire route will also be contaminated by the wire. Conclusion Way to reduce bonding error is to keep wire surface clean. Careful h

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