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1、ZDISPLACEMENTCURVEThefollowingparagraphsdescribeatypicalbondcycleusingreversemotion.Althoughusingreversemotionwilladdtothetotalcycletime,theloopprofilesarequiteenhancedforlongwires.Abondcycleusingreversemotiontakesroughly115milliseconds,dependingonbondingpa
2、rametersused.HeatFirstHalfCycleSecondHalfCycleRESETThebondingcyclebeginswiththebondheadattheresetposition.Aballhasbeenformedfromthepreviouscycle.TheXYtablehaspositionedthecapillaryoverthefirstbondposition.Thewireclampsonthebondheadareopen,andvacuumtensionis
3、applied.ResetZDISPLACEMENTCURVEDescenttofirstBondResetDESCENTTOFIRSTBONDHighspeeddescentbegins.Vacuumabovethebondheadsuppliesasmallamountofdragtothewire,keepingtheballseatedintheinnerchamferofthecapillary.ZDISPLACEMENTCURVEFirstTipDescenttofirstBondResetTOO
4、LINFLECTIONPOINT(TIP)Atauser-configuredheight(3-35mils)abovethefirstbondsurface,thebondheadslowsdowntoaconstantspeedknownasbondvelocity.Thecomputerawaitsforcontactthresholdtoregisterthatthecapillaryhasmadeimpactwiththesurface.Thewireclampscloseforaninstantt
5、oinhibittheballfromflyingoutofthecapillaryduetoinertiaatthischangeofvelocitypoint.ZDISPLACEMENTCURVEForceUSGHeatFirstBondFirstTipDescenttofirstBondResetFIRSTBONDThecapillarytouchesthesurface.Thecomputerappliestheprogrammedforce.(Thisisnotseeninthedisplaceme
6、ntcurvesinceitisderivedfrommotionsofthecapillary).Thecomputerfirestheultrasonicpowerfortheprogrammedamountoftime.ZDISPLACEMENTCURVERisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetRISETOKINKHEIGHTBondheadbeginsascent.Thebondheadisdrivenupinhigh
7、velocitytoaprogrammedheightknownaskinkheightandstops.ZDISPLACEMENTCURVEReverseMotionRisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetREVERSEMOTIONTheXYtablemoves180degreesawayfromthesecondbondpointaprogrammeddistance.Thisputsareversebendinthewi
8、rewhichwillstrengthenthewireprofile.ZDISPLACEMENTCURVERisetoLoopFactorReverseMotionRisetoKinkForceUSGHeatFirstBondFirstTipDescenttofirstBondResetRISETOLOOPFACTORThebondheadrisestoaloopheightcalculatedb
