Automated Conformal Coating Inspection & Thickness …

1 Automated Conformal Coating Inspection & Thickness MeasurementHector L. FonsecaSr. Applications EngineerNordsonYestech, Advanced Technology SystemsAutomated Conformal Coating Inspection & Thickness MeasurementContent Automated Conformal Coating Inspection Conformal Coating background Conventional Inspection Techniques Technology used in ACI Applications / Algorithms Examples Dual AOI / ACI Capability Conformal Coat Thickness measurement Conventional Thickness measuring methods Technology used in Spectral Interference Application Example / Repeatability Analysis Questions / CommentsAutomated Conformal Coating Inspection & Thickness MeasurementConformal Coating backgroundAconformalcoatingisaprotective barrierthatshieldssensitiveelectroniccom ponentsagainstharshenvironmentalconditio nssuchasmoisture.

2 Lightweight,highlyflexible&fairlysimplet oapply. Completelyprotecttheassemblyagainstchemi calandcorrosiveattack. Eliminatepotentialperformancedegradation duetoenvironmentalhazards. Protectionagainstthermalandmechanicalsho ckSimilartothepreviousproductionstages, ,properwettingismostlyvisiblycheckedbyma nualmeans,withtheusualmanualopticalinspe ctiondisadvantages: Automated Conformal Coating Inspection & Thickness MeasurementConventional Inspection Techniques Inspection &hazardawarenesstrainingarereq uired. ResultsaredependentbyInspectorexperience +InspectortoInspectorvariability. Requireshigherworkingspaceallocation. IncreasedworkinprogressWIP. Inadequateproducthandling. WaveIRVisibleUVX-rayGammaAutomated Conformal Coating Inspection & Thickness MeasurementChoose Your WavelengthAutomated Conformal Coating Inspection & Thickness MeasurementTechnology used in ACIS ameasAOI,ACIaresystemswhereanassemblyofc ameras,lightingandX-Ystageautonomouslysc ansthePCBtakingimagesthatareanalyzedbyap rocessingsoftware,basicallybyconvertingi magestoBLOB sandanalyzingpixelbrightnessandcoverageo frequiredareas, , ,itsmainadvantagesincludes: HighThroughput, 50 Xmagnification Cycletime:<20seconds Increasedtraceability,sincecanalsoreadab arcodeonPCBandstoretheinspectionresultso nadatabase.

3 Highrepeatability&nonOperatordependent. Smallfootprint. Matching will also help to inspect SMT or different components (transformers, shields, connectors, etc)Blobanalysisallowstoidentifyconnecte dregionsofpixelswithinanimage,thencalcul ateselectedfeaturesofthoseregions(samelo gicalpixelstatebasedonagivendeterminedcr iteria).Eachpixelinyourimagerepresentsar ealwidthandheight(forexample,inmicrons). However, , Conformal Coating Inspection & Thickness MeasurementMeasurement Algorithms BLOB AnalysisSoftwareusesauser-specifiedblobi dentifiertodiscriminatebetweenblobsandth ebackground,afterwards,cancalculateavari etyofdifferentblobmeasurementsorfeatures ,suchasthearea,dimensions, Conformal Coating Inspection & Thickness MeasurementApplications / Algorithms ExamplesNo Coating / Coating InsufficiencyAutomated Conformal Coating Inspection & Thickness MeasurementApplications / Algorithms ExamplesKeep Out ZonesAutomated Conformal Coating Inspection & Thickness MeasurementApplications / Algorithms ExamplesCoating DelaminationAutomated Conformal Coating Inspection & Thickness MeasurementApplications / Algorithms ExamplesBubblesAutomated Conformal Coating Inspection & Thickness MeasurementApplications / Algorithms ExamplesCount / Pitch / Regularity / Dispensed AreaMaximum / Minimum Width Width (Avg)

4 & Angle OffsetAutomated Conformal Coating Inspection & Thickness MeasurementDual AOI / ACI Capability Camera LensWhite, Red and UV Fusion Lighting LEDS tandardAOIlighting+ , Conformal Coating Inspection & Thickness MeasurementInline AOI/ACI -Quick Defect Reports -SPC Web-based Reporting Easy to read visual defect reports highlight failed Coating areas on PCB. Real-time SPC Monitoring Email Alarm RecipientsAutomated Conformal Coating Inspection & Thickness MeasurementConventional Thickness Measuring MethodsAnothercriticalfactorinconformalc oatingprocesscontrol,istoensurethatthick nessiswithininternalandinternationalstan dards, , , Conformal Coating Inspection & Thickness MeasurementTechnology Used Spectral Interference Laser Displacement MeterByintegratingintotheAOIsystemtheexi stingtechnologyofaSpectral-interferenceL aserDisplacementMeter,ameasurementdevice thatusesaslightsourceaninfraredSuperLumi nescentDiodetoemitbandsofbroadwavelength sthatreflectsbetweentopandbottomsurfaces ofthecoatingtoaCharge-CoupledDevice.

5 Coatingthicknessmeasurementscanbeobtaine dacrossthesurfaceofcoatedcircuitsboardsa ndbeusedwithinsoftwarealgorithms,inconju nctionwithAOIcamerasandX-Y-Zstage, Conformal Coating Inspection & Thickness MeasurementApplication ExampleStudy 1 System cycled over same spot, > 20k timesAutomated Conformal Coating Inspection & Thickness MeasurementRepeatability AnalysisStudy 2 System cycled over same spot of 4 different coatings in different points of the scanning area of the FX940, 100 timesABCDA utomated Conformal Coating Inspection & Thickness MeasurementRepeatability AnalysisConventional CC Inspection TechniquesACIA utomated Conformal Coating Inspection & Thickness MeasurementConclusionAftersuccessfullyin tegratingofACI/ThicknessMeasurementtechn iquestoexistingAOIsystems,lowandhighvolu meEMScompaniescannowaccuratelyandobjecti velyinspectandrecordvaluabledataathighsp eeds, more information contact:NordsonYESTECH2762 LokerAve West Carlsbad, CA !