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隐藏式双层梳齿驱动的MEMS扫描镜阵列

Hidden Dual Layer Comb Drive MEMS Scanning Mirror Array

  • 摘要: 针对传统静电驱动型MEMS扫描镜阵列普遍存在填充因子偏低、谐振频率较小的问题,提出了一种具有高填充因子、高谐振频率的二维MEMS扫描镜阵列。该扫描镜使用隐藏式梳齿驱动,外侧驱动结构为嵌套式双层梳齿。通过理论分析构建了扫描镜的驱动模型,并利用COMSOL软件对其静、动态特性进行了仿真研究。仿真结果表明,该器件在实现91%高填充因子的同时,当施加30 V正弦驱动电压时,此扫描镜内、外轴的谐振频率分别达到9364.9 Hz与13262 Hz,对应的偏转角可达4.1°和6.3°。通过对阵列特征频率与静态响应的分析,验证了该阵列具有良好的阵列一致性。此外,针对该器件设计了一套制备工艺并对其工艺误差敏感性进行了分析,为静电MEMS微镜阵列应用于扫描成像提供了理论参考。

     

    Abstract: To address the common shortcomings of conventional electrostatic-driven MEMS scanning mirror arrays, including low fill factor and low resonant frequency, a two-dimensional MEMS scanning mirror array featuring a high fill factor and high resonant frequency is developed. This scanning mirror employs a concealed comb-drive technique, featuring a nested double-layer comb structure for its outer drive unit. Through theoretical analysis, a drive model for the scanning mirror was constructed, and its static and dynamic characteristics were simulated using COMSOL software. Theoretical results indicate that while achieving a high fill factor of 91%, under a 30 V sinusoidal voltage drive, the inner and outer axes of this scanning mirror exhibit resonant frequencies of 9364.9 Hz and 13262 Hz respectively, corresponding to deflection angles of 4.1° and 6.3°. Analysis of the array’s characteristic frequencies and static response verifies that the array exhibits good consistency. Furthermore, a fabrication process was designed for this device, and its sensitivity to process errors was analyzed, providing a theoretical reference for the application of electrostatic MEMS micromirror arrays in scanning imaging.

     

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