【摘 要】
：
Single LED package based on encapsulated leadframe provides a common electrical and thermal path with dramatic reduction of its thermal resistance.The specific LED packaging technology consists of a s
【机 构】
：
Boschman Technologies B.V.,Duiven,The Netherlands
论文部分内容阅读
Single LED package based on encapsulated leadframe provides a common electrical and thermal path with dramatic reduction of its thermal resistance.The specific LED packaging technology consists of a silver plated copper leadframe overmolded with a reflective white compound.This paper presents low cost molding process to mold the leadframe with bleed/flash free.With single/double films lining of the molded parts,film assisted transfer molding technology(FAM) provides easy release of the compound from the mold and keeps specific surfaces clear from the molding compound.The LED module based on the leadframe encapsulation and LED system wafer level integration can be easily reached with low cost by FAM technology to keep certain LED surfaces and sensor clear.
其他文献
烧结过程中铁矿粉的同化性是研究高温特性的重要部分,具有适宜同化性的铁矿粉,在烧结过程中液相粘结良好,有利于烧结矿质量指标的改善.本文对京唐烧结用料中代表性的五种主料矿粉:巴卡粉、杨迪粉、巴烧粉、澳粉和地方粉的同化性能进行了测试;并按两两搭搭配组合方式进行了同化性测试,发现不同矿粉两两搭配后,混合粉的同化性均介于单种矿粉的同化性之间,并且混合矿同化性基本与单种矿比例呈现线性相关关系.
马钢2号高炉在保持稳定顺行的基础上,为了降低铁水成本,生产中实施降低焦比提高煤比攻关。通过分析原燃料质量对高炉生产的影响、摸索研究高炉操作炉型的变化和长期生产实践表明:抓好精料工作是搞好高炉顺行,降低焦比提高煤比的有效途径;上下部调剂相结合,优化炉内操作高炉顺行的基础;提高风温和富氧喷煤相结合是提高煤比的保障。2012年10月起高炉煤比达到并稳定在160kg/t,其它各项经济指标也得到明显改善。
高炉净煤气人工测尘工作必不可少,承钢高炉净煤气测尘工作近几年得到了各部门的高度重视,得到准确的数据需要注意从取样系统设计到设备正确使用和数值准确计算等很多细节。
河北钢铁集团承德分公司360㎡2＃、3#烧结机余热发电项目自投产以来一直存在烟温不足的情况,环冷机一段烟温260-310℃,二段烟温150-220℃,三段烟温120-180℃,远远低于一段烟温400℃,二段烟温300℃,三段烟温200℃的设计值,余热锅炉所产生的蒸汽温度不能满足汽轮机最低350℃和192℃的设计要求,机组如何实现安全稳定运行是所面临主要问题.在确保机组安全稳定运行情况下,通过降参数
由于烧结生产的特殊性,生石灰、白云石及除尘灰等小颗粒干物料用量较大,在皮带机倒运过程中,导致一次混合机区域产生大量粉尘,粉尘排放浓度严重超标,操作环境极差,通过对原工艺布局进行优化改造并对混合机进料端进行整改后,区域扬尘现象得到有效遏制,同时有效降低了区域设备故障率.
对2号高炉优化操作的生产实践进行了总结.在原燃料质量劣化的条件下,通过加强入炉料管理,优化高炉操作制度,做好炉型维护及抓好炉外出渣铁工作等,使高炉冶炼水平不断提高,取得了较好的技术经济指标.
As the defects in the LED chip is an important factor affecting the properties of high-power LEDs,a new measurement system is proposed which can get nonradiative recombination defect densities of a LE
Temporal modulations of light from AC-LED sources can produce a number of visible artifacts,such as flicker,stroboscopic effect,etc.Flicker is common in low frequency situations,while the stroboscopic
Voltage-temperature coefficient (S) is the key parameter for measuring the light-emitting diode (LED)’s junction temperature.Common method for determining junction temperature by the S is under low cu
One of the most critical reliability problems that the LED COBs are facing is the failure of wire bonding connections.The LED COBs would easily break down due to the mechanical shocks or material stre