基于机器视觉的bga微焊球高度测量方法与系统的分析

《基于机器视觉的bga微焊球高度测量方法与系统的分析》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、硕+学位论文ABSTRACTTheBallGridArray(BGA)packageisakindofhighdensib．areaarrayadvancedpackagingtechnologySolderjointreliabiliqisighlvdependentonsolderballheightuniformiIy／coplanimty，soitisVCD"importanttomeasufetheheightofsolderballsonchipsAtpresent，packagingenterprisesneedakindofmicroso

2、lderbailheightinspectionequipmentwithfastspeed，moderateaccuracy，lowcostInthispaper．anovelprojectionmethodforsolderballhcightmeasurementwasproposedandamachinevisionsystemtorealizethismethodwasdesignedThemainresearchcontentswerelisted盐follows：1)AccordingtotheSEMimageofmicrobumpthei

3、dealsphericalcapassumptionofmicroBGAsolderballwasverified．Basedollthisassumption．atlcwprojectionmethodformeasuringsolderballhcightWaSproposedUndertheilluminationofaparallellightbeamTheinfluencefactorsonheightmearurementresults'wereanalyzed，suchaslightincidentangle，ballradius．andl

4、engthofshadowAimagingmethodusingalow-angleLEDringlightsourceandawhiteLEDdotlightsourcewasdesigned2)Forthesolderballimageandshadowimage．thecontourofsolderballandshadowwereex【ractedthroughfilteringautomaticsegmentatinnusingOtsuthresholdmethod，halefilling．contourexlxactionThesolderb

5、agandshadoweoniolArwasproposedbasedoncircle，elhpsefining．respectivelyExperimentalresearchshowtheimageprocessingalgorithmisefficientandstable3)Anautomaticmicrobumpheightinspectionsystembasedonmachinevisionwasconstructedwithaself-designedmachinestructure．controlcircuitandcontralsof

6、i3varedevelopedbyOpenCV＆VisualCHnemicrosolderballwithheightofabouthundredsofmicroswasmeasuredauomaicly4)Theeffectofchiptranslation．rotation．substratematerial．andthewarpageofsubstrateonmicrosolderballheightmeasurementresultswerestudiedExperimentsandtheoreticalresearchshowthatthesu

7、bstrateXdirectionwarpageisthemainaspecttoinfluenceheightresults．astheXdirection,,varpagechangedtheanglebetwcenthesubstrateandtheincidentlightAccordingtotheheightdistributioncharacteristicsofheightresultsanautomaticcompensationalgorithmwaspresentedKEYWORDSMachinevisionBGA．Heightin

8、spectionOpticalshadow,Imageprocessing硕士学