Beijing Key Laboratory of Bioelectromagnetism

Beijing, China

Beijing Key Laboratory of Bioelectromagnetism

Beijing, China
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Wang X.Y.,University of Chinese Academy of Sciences | Wang X.Y.,CAS Institute of Electrical Engineering | Wang X.Y.,Beijing Key Laboratory of Bioelectromagnetism | Fang G.R.,CAS Institute of Electrical Engineering | And 3 more authors.
Applied Mechanics and Materials | Year: 2013

It takes too much time for the software system of electron beam lithography to display files with large amount of graphic data, which affects the efficiency of electron beam lithography. In this paper, a graphic displaying algorithm is proposed and experimented. The result shows that the displaying algorithm not only guarantees the precision of the graphic data, but also displays files with large amount of graphic data fast, improving the efficiency effectively. © (2013) Trans Tech Publications, Switzerland.


Fang H.,CAS Institute of Electrical Engineering | Fang H.,University of China Acdemay of science | Fang H.,Beijing Key Laboratory of Bioelectromagnetism | Zheng L.,CAS Institute of Electrical Engineering | And 8 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2015

DBC(direct bonding copper) plate, as an important part to fulfill electrical connection by using ultrasonic bonding technique in classical power module, has a wide application in high power electronic device module. As a result, the bondability of DBC plate has a vital influence on products' rate and reliability. Previous studies focused on how the bonding parameters(power bonding, pressure bonding, bonding time) affect the performance of the bonding. However, few researches of surface morphology on the wire bondability were reported. This paper presents a study of the surface morphology of DBC plate on the ultrasonic wire bondability. The results of experiments show that the average distance between the microscopic irregularities(Sm) of the surface morphology of DBC plate has a very important influence on bondability. On one hand, better bondability will be abtained if the parameter Sm of the DBC plate surface is smaller. Otherwise, the bondability of DBC plate will be much worse. On the other hand, the bonding strength discreteness is decided by the surface roughness based on the successful bonded, the smaller of the surface roughness is, the less discrete of the bonding strength is. Lastly, these results are analysed by using spatial spectrum method and tribology theory. ©, 2015, Chinese Machine Press. All right reserved.

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