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Browsing by Author "Ye, Zheng-Jie"

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    Effect of Pd distribution on Pd-plated Cu wire using different electronic flame off settings
    (2017-03-01)
    Cheng, Pi-Ying
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    Lai, Po-Ying
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    Ye, Zheng-Jie
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    Hsieh, Cheng-Li
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    Ye, Jiun-Ming
    Pd-coated Cu wires show interesting properties such as good electrical conductivity, thermal conductivity, and reliability and are widely used in microelectronic packaging. However, during the formation of free air balls (FABs) and bonded balls via Pd-coated Cu wires, the electronic flame off (EFO) current setting affects Pd distribution in FABs and bonded balls. This study investigated the effect of different EFO current settings on Pd distribution during the formation of FABs and bonded balls, and also analyzed the influence of EFO current settings on FAB formation. Pd distribution in FABs and bonded balls, as well as the distribution of other elements, were observed. The corrosion on the surface of a bonded ball was observed through high temperature storage tests (HTSTs). The result revealed that there were different Pd distributions in the formation processed via different EFO current settings of FABs and bonded balls. Further, different EFO current settings also resulted in a different FAB shape. The result of HTST indicated that proportional Pd distribution could decelerate the corrosion of a bonded ball.
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    Rapid displacement sensor based on fitting scan
    (2016)
    Ye, Zheng-Jie
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    Hwang, Chi-Hung
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    Cheng, Pi-Ying
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    Chen, Chih-Yen
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    Weng, Chun-Jen
    A rapid displacement sensor with a varifocal lens based on a method of fitting scan is proposed for 3D surface profiling. The focal length of the varifocal lens can be adjusted by varying the driving current. By detecting the reflective power of the reflected laser, the displacement can be obtained. By integrating a LabVIEW program based on a Levenberg-Marquardt algorithm in this system, the measuring speed can be substantially improved. Finally, the 3D surface profile of a step-height sample was successfully scanned by this displacement sensor.