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  • 學位論文

雷射掃描晶圓定位系統

Wafer Positioning by Laser Scanning Method

指導教授 : 李朱育
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摘要


本論文提出一雷射掃描晶圓定位系統用來量測集束型設備中晶圓的 圓心位置。此定位系統是由雷射掃描系統與散射光偵測系統組成。利用振鏡 掃描器將雷射光線反射至感測區域形成一道掃描光線。當機械手臂輸送晶圓 通過掃描光線時,散射光偵測系統將接收到一光強度隨時間變化之散射光時 序訊號。根據散射光時序訊號與已知的速度及位置參數,晶圓位置演算法便 可計算出機械手臂運動速度與晶圓圓心位置。 為驗證系統之定位能力,使用四吋晶圓進行實驗。在以實驗速度為速度 參數之實驗中,定位精確度小於1.5mm;在以理論速度為速度參數之實驗中 ,定位精確度則皆小於0.1mm。本系統亦可用於速度量測,速度量測之絕對 誤差小於1mm/s,量測精確度則低於0.7mm/s。

並列摘要


A laser scanning method for wafer positioning is proposeed to determine the center position of the wafer in the cluster tool. This positioning system incorporates a laser scanning system and a scattering light receiving system. The scanner is used to reflect a laser beam into a scanning line on the sensing area. As the wafer passes by the scanning line, a scattering light receiving system detects the time-sequence signal of the scattered lights. The velocity of a robot plate and the position of wafer ia determined by signal processing of the time-sequence signal. 4-inch wafer positioning experiment results demonstrate that the positioning system can be used to detectc the positioning of a wafer. The velocity measurement precision is under 0.7 mm/s, and the absolut error is about 1 mm/s. The wafer positioning precision is 0.1 mm.

參考文獻


[10] R. Fay, P. Peng, W. Chen, G. Tsai and J. F. Chang, “Wafer positioning device”, U. S. Patent, No. 6471464, 2002.
[13] J. W. Lee, B. G. Lee, J. J. Lee and J. Yoon, “Position error inspection for mounting wafer in cleaning device using the radial shape board”, VIZ ''09 Proceedings of the 2009 Second International Conference, pp. 247-252, 2009.
[14] V. F. Duma, A. G. Podoleanu and M. Nicolov, “Modeling a galvoscanner with an optimized scanning function”, Syrom 2009, pp. 539-548, 2010.
[15] V. Duma, “On-line measurements with optical scanners: metrological aspects”, Proc. SPIE, Vol. 5856, pp. 606-617, 2005.
[16] L. Beiser, “Fundamental architecture of optical scanning systems”, Applied Optics, Vol. 34, No. 31, pp. 7307-7317, 1995.

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