白小姐四肖必选一肖

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大功率白光LED死灯的分析


    来源:一灯论坛  时间:2014-10-30  【字体:  

       5050BAIGUANGLED,0603CUILVLED。

      A.基本资料:

      1.不良样品:大功率白光成品。

      2.反馈不良样品数量:114pcs。

      B.异常内容:

      经对反馈异常样品测试,共114pcs样品中不良情况如下:

      1.测试VF和IR正常88pcs,可正常点亮。取其中5pcs正常品、和1pcs去掉透镜,再使用350mA常温条件老化48小时,均未出现死灯不良现象,各项参数正常。

      2.开路死灯26pcs

      C.原因分析/调查结果:

      1.针对开路死灯原因分析:

      SUIJIQU6pcsSIDENGYANGPINJINXINGCHAIJIEFENXI,FAXIANQIZHONG4pcsCUNZAIJINXIANDECDIANCHUCHUXIANDUANXIANZAOCHENGSIDENG;LING2pcsZAIDDIANCHUDUANXIANZAOCHENGSIDENG。

      FU:HANXIANGUOCHENGXIANHUGEWEIZHIDEDINGYIRUXIATU:

      图1:焊线定义图

    白小姐四肖必选一肖   ADIAN:JINGPIANDIANJIYUJINQIUJIEHECHU;

      BDIAN:JINQIUYUJINXIANJIEHECHUJIQIUJINGCHU;

    白小姐四肖必选一肖   CDIAN:HANXIANXIANHUSUOZAIFANWEI;

      DDIAN:ZHIJIAERHANHANDIANYUJINXIANJIEHECHU;

    白小姐四肖必选一肖   EDIAN:ZHIJIAERHANHANDIANYUZHIJIAYANGJIJIEHECHU;

      2.从断点死灯的情况来看,造成断线的一般原因有:

      2.1.ZHENDUICDIANDUANXIAN:

    白小姐四肖必选一肖   2.1.1、JINXIANBENSHENYANSHENLIBUZU;ZHEIDIANBUYONGDUOSHUO,LALICESHIKEYIJIANCECHUSHIFOUDADAOJINXIANGUIGESHUSUOBIAOCHENGDELALIZHI;JINXIANBENSHENYANSHENLIBUZUYESHIYUJIAGONGBIAOMIANGUANGHUADUYOUGUAN,HAOBI“FENGKOUJIAODAI”;BIANYUANBUPOSUNSHIKEKANGHENQIANGDELALI,TANGRUOBIANYUANPOSUN,ZESHAOWEIYONGLIJIKELADUAN,DAOLIXIANGSI。

      2.1.2、CIZUIWURAN、MOSUNZAOCHENGJINXIANNEISHANGDUANXIAN、RENGONGXIUXIANHUZAOCHENGJINXIANGUASHANG;QINGXINGYU2.1.1.XIANGSI。RUXIATU2SHIYITU。

      图2:受损金线图

    白小姐四肖必选一肖   2.1.3、WAILIGUODA/JIAOSHUINEIYINGLILACHEDUANXIAN;ZHENDUIWAILIGUODALADUANJINXIAN,HOUMIAN3.2ZUOXIANGXIFENXI。

      ZHEIBUFENZHUYAOSHICIZUIZHILIANGWENTI,SHIYONGCHAOGUOSHOUMINGSUOZHI;CIZUISHOUMINGBUNENGYIGUDING“SHIJIDAXIANCHANLIANG”WEIZHUN,ERSHIJIEHEHANXIANXIAOGUOJUEDING;DANGBUZUCHANLIANGYAOQIUSHI,RUOYIJINGZAOCHENGHANXIANXIAOGUOBUHEGE(JIEHEGAOBEILVXIANWEIJINGJIANYAN),YEYINGLIJIGENGHUAN;LINGWAI,RENGONGFANGONGTAXIANXIUXIANBUDANGYIKEZAOCHENGJINXIANGUASHANG。SHANGTUWEIJINXIANGUAHEN。

      2.2. ZHENDUIDDIANDUANXIAN:

      2.2.1、HANXIANCANSHUYOUHUAPIPEIBUDANG:RUGONGLVHEYALIGUODADENG;

      HANXIANCANSHUDIAOZHENG,ZHUYAOQIANGDIAOJIANYAN:ADIANWEIZHIDEJIEHELI、BDIANWEIZHIDEJINQIUDAOJINXIANDEGUANGHUAGUODUHEDDIANJINXIANDAOHANBADEZHUJIANGUODURUTU4SUOSHI;ERHANXIANCANSHUYOUHUAPIPEIBUDANGRUGONGLVHEYALIGUODADENGJUNHUIZAOCHENGHANBAGUOBIANGUOBOERKANGLALIBUZU;RUXIATUSUOSHI:

      图3 :不良二焊焊巴

      图4 :OK二焊焊巴

      2.2.2、CIZUICHICUNYUJINXIANPIPEIBUDANG;CIZUINEIJINGGUOXIAOHUIGUAHUAJINXIAN;NEIJINGGUODAZEHUISHIJINXIANZAIHANXIANGUOCHENGZHONGHUADONGBUDING、HUAQIUDENGBULIANG,YEJIANGDIKANGLALICHENGDU。

      2.2.3、WAILI(JIAOSHUINEIYINGLI)GUODALACHEDUANXIAN;ZHENDUIWAILIGUODALADUANJINXIAN,HOUMIAN3.3ZUOXIANGXIFENXI。

      3.从此次分析的不良样品看,从断线的C点位置来看,均出现在透镜“压弯折”处;如下图5:

    白小姐四肖必选一肖   RUTU5SUOSHI:ZHENGCHANGQINGKUANGXIAXIANHUXINGCHENGDEHUXINGSHIPINGHUADEQUXIAN;ERSHIJICHENGPINDEXIANHUBEITOUJINGYALEYIGEWANZHECHURUTU5SUOSHI,GAIWANZHECHUWANZHEDEJIAODUJIEJIN90°DEWANZHEJIAO。CIWANZHEGUOCHENGYIDINGDUIDDIANCHUDEHANXIANYOUYIDINGDELACHELI。ERDUIBDIANCHUDEWEIZHI,YOUYUXIANHUHAIYOUYIDINGDEZHANGDU,KEYIHUANCHONGZHEIBUFENDELALI。

      3.1、RUTU6TOUJINGDE“HONGSENEIQUANHELANSEWAIQUAN”,YUTU7“ZHIJIADEHONGSENEIQUANHELANSEWAIQUAN”XIANGDUIYING,CONGTU7MINGXIANKANCHU,TOUJINGDENEIBIANYUANZHIJIEYAJINXIANZHECHENGYUE90°WANZHEJIAODU。

      3.2、CHOU6pcsSIDENGDEYANGPINFENXI,YOU4pcsJUNSHICONG“JINXIANWANZHECHU”DUANXIAN;CIDUANXIANYUANLI,YIBANSHIWANZHEGUOCHENGTOUJINGBIANYUANGUOYU“FENGLI”,JIAZHIYAWANZHIWAILIJIAODA,ZAOCHENGJINXIANPOSUN,ZAIHOUXUDENGZHU“GONGZUOGUOCHENG”JIAOTIDEBUDINGXIANGNEIYINGLIZUOYONGZUIHOUCUIDUANJINXIAN。LINGWAIYIZHONGQINGKUANG,YOUYUJINXIANDUANXIANHOU,RENGSHIJIECHUDEHENJIN,DIWENSHIBAOCHIJIECHU,RENGKEYIDIANLIANG,DANSHISUIZHEGONGZUOWENDUDESHENGGAO,JIAOTINEIYINGLIBIANDAJINXIANSHAOWEISHOULITUOLIJIECHUDIAN,JIHUICHUXIANKAILUSIDENG,HUOSHI“SHILIANGSHIBULIANG”DEYICHANG。

      3.3 、CONG6pcs SIDENGYANGPINFENXIYOU2pcs JUNSHICONG“DDIANCHU”DUANXIAN(JIUSHIHANXIANYUHANBADEJIEHECHUDUANXIAN);CICHUDUANXIANYUANYINZAI2.2.1ZUOGUOFENXI,ZHEILIZHONGDIANFENXIWAILIZAOCHENGDUANXIAN,CONG3.2FENXIKEZHI,ERHANDEDDIANSHOULI,YIJIZHICHENGDELALICESHIJUNTONGGUO,JUNKEYISHUOMINGERHANHANXIANCANSHUBUDANGHUOCIZUIBULIANGZAOCHENGERHANDDIANSHOULIBUZUDEKENENGXINGCIZHI,FANER“GAITOUJING”SHITOUJINGYAWANLACHEJINXIANZAOCHENGDESUNSHANGKENENGXINGYAOJUSHOUWEI。

      4.综上所述:

    白小姐四肖必选一肖   4.1.CONGYISHANGFENXIKEPANDUAN,ZAOCHENGSIDENGDEYUANYINSHIDUANXIANKAILUZAOCHENGSIDENG;

      4.2.ZAOCHENGDUANXIANDEYINSUZHONGDUO,CONGBULIANGYANGPINFENXIKAN,TOUJINGNEIBIBIANYUANYAWANZHEJINXIANZAOCHENGJINXIANPOSUNSHIGENBENYUANYIN。QIESUOYOUFENXIDEWEISIDENGDELIANGPINZHONG,CHAIXIATOUJING,DOUKEYIFAXIAN,JINXIANWANZHECHUSHIZHIJIEJIECHUTOUJINGBIANYUAN,JINXIANYUTOUJINGZHIJIANBINGWEIYOUJIAOTIGELI,JIYIYUSHIJINXIANYUTOUJINGZHIJIANXINGCHENGMOCASHIJINXIANPOSUNDUANXIAN;LINGCONGGUOQUDEYICHANG“CHUDUANXIAN”LAIKAN,KEYISHUOMING“WAILIZHISHIJINXIANDUANXIAN”ZHEIYIDIAN。

      D.预防对策:

      ZHENDUI4.2ZHIYICHANGYUANYIN,TIGONGRUXIAZHIYUFANG,JINGONGCANKAO:

      1.预防对策一:调整焊线工艺,使二焊靠近铜柱(或使线弧变低),或可能的话,改变透镜与支架的匹配规格),避开透镜直接压到金线的线弧。

      2.预防对策二:白小姐四肖必选一肖在“盖透镜制程”中,避免员工斜着盖透镜(即员工为了加快速度,定位时,先斜着扣压透镜的一边“耳朵”,然后再扣下整个透镜),这样具有定位作用的扣下的“第一耳朵”就有可能过压金线造成金线破损。盖透镜正确做法是对准后,把透镜直接垂直盖下去。

      3.预防对策三:透镜压边确保到位,这样避免透镜后续的移动磨损金线而使金线受力不足断线;

      4.预防对策四:白小姐四肖必选一肖注胶制程,手动注胶时速度放慢些,理由有三:一是有利于空气的排出;二是减少胶量的浪费;更重要的是第三,就是减少注胶时的胶水冲力对二焊D点的冲击造成内损。

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