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標題: | 使用MetalMUMPs技術製作靜電旋轉平台和一維電熱致動器以及多維度之微機電電熱夾 Electrostatic In-plane Comb-drive Rotational Platforms, 1-D Vertical Electrothermal Actuators, and Multiple DOFs MEMS Gripper Fabricated by the MetalMUMPs Process |
作者: | Dian-Sheng Chen 陳典聖 |
指導教授: | 蔡睿哲 |
關鍵字: | 微機電,靜電致動器,電熱致動器,微機電電熱夾,平面梳狀致動器,多層材料, MEMS,MEMS gripper,electrostatic actuator,electrothermal actuator,in-plane comb-drive actuator,multi-material, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 微機電系統(Microelectromechanical System, MEMS)是一種結合光學、機械、電子、材料、控制、物理、化學、生醫等多重技術領域的整合型微小化系統製造技術,隨著科技的進步,許多微機電(MEMS)的技術也逐漸發展趨於成熟,目前其應用範圍也非常的廣泛,包括加速計(accelerometer)、壓力感測計、生化感測計、噴墨印表機噴頭、陀螺儀、以及許多種感測器等等。而藉由COMS/MEMS整合製程以帶來更高的競爭力,並擴大了MEMS在消費性電子產品的潛在應用。
常見的致動器具有不同驅動方式:靜電驅動、電熱驅動、壓電形變、電磁驅動……等等,而驅動方式不同產生位移效果也有差異,一般而言針對不同的材料特性以及不同元件操作方式去設計其驅動方式。 於本篇論文中介紹利用MetalMUMPs製程方式去製造各種不同的元件,首先是以靜電方式驅動的平面梳狀致動器(comb-drive)一維旋轉平台。此旋轉平台的轉軸位於平台底部中央,當加電壓於疏狀致動器時,側向將會有靜電力產生,此平台會因為底部有支點的關係而傾倒,所以會產生旋轉。得到實驗結果為當施加105V的電壓時平台的旋轉角度可達2.870. 論文中提出的第二種設計是一維垂直方向位移的電熱致動器。改變以往以單一材料(uni-material)為主要結構或者是不同材料結合而成的雙層結構(bimorph),我們設計了分隔式、再加上多種材料結合而成的電熱致動器,其中最頂層之鎳金屬具有較大的熱膨脹係數(CTE)以及較小的比熱,中間層是空氣視為gap,底層的多晶矽(Polysilicon)當做電流通路並且被氮化矽(Si3N4)所包覆住。當電流通整個結構時鎳金屬會產生一維垂直向下的彎曲。經過量測多組不同設計尺寸的元件得到最小的驅動電流在1.06mA時,致動器頂端即可達到20μm向下的位移,消耗的功率為16.29mW. 本篇論文的最後我們提出了結合兩個各自獨立方向的電熱致動器,組合成二維的微機電電熱夾(MEMS gripper),其中橫向的位移是由鎳金屬所組成的冷端-熱端結構(hot-arm and cold-arm architecture)當電流導通後,由於截面積大小不同,將產生溫差而使得膨脹不同造成橫向方面的位移,另外縱向位移是由本論文中所提出的第二種電熱致動器設計,藉由結合兩者而設計成為可以夾住物體的元件,本元件產生最大的橫向位移83.7μm以及縱向位移98μm,當電壓分別加橫向電壓0.6v以及縱向電壓87.2v Micro-Electro-Mechanical System(MEMS) is the technology which integrate the optics, mechanics, electronics, materials, control, chemicals, physicals, and biomedical, and optoelectronics techniques to fabricate micro-scale mechanical elements. With the technology progressing, many other MEMS technology develop gradually. In recent years, MEMS have applied to a wide field, including the accelerometer sensor using in airbag deployment systems for modern automobiles, inkjet-printer cartridges, pressure sensor, biological sensor, micro-gyroscopes, etc. The applications of MEMS technology have covered the consumer electronics due to integration of CMOS technology. The actuation methods for typical micro-actuator include electrostatic driving, electrothermal driving, piezoelectric deformation, and electromagnetic driving, etc. Various mechanisms have been exploited to generate force and displacement. In generally, we have to drive the device by its material characteristic and the operation. In this paper, we present some device which were made by MetalMUMPs process. The first, we design a 1-D rotational platform which is driven by electrostatic in-plane comb-drive actuators. The rotation axis locates on the middle of the bottom of the platform. When we apply the voltage between the comb fingers, the platform will cause “tilt” due to the created pivot on the bottom of the platform so that the rotational platform is accomplished. An out-of-plane rotational platform with in-plane electrostatic comb-drive actuators is presented in this thesis. A rotational angle of ±2.87o is achieved at a static driving voltage of 105V. Another design proposed in this thesis is the vertical electrothermal actuators. We design the electrothermal actuators in the form of separated multi-materials which are different from uni-material and bimorph. Among them, the upper nickel metal provides higher coefficient of thermal expansion (CTE) and lower specific heat. The middle layer of the structure is air gap. Silicon nitride is used to be the torsion springs that connects to the movable nickel combs and rotational platform. Polysilicon enclosed in the nitride springs provides the electrical feed-through for the movable combs. While the electric current passes through this circuit, the tip of the nickel metal will induce downward bending. After measuring several devices in different design parameters, the actuator tip displacement of 20μm is achieved in driving power of 16.29mW. In the last of the article, we present the bidirectional MEMS gripper by combing two independent directions electrothermal actuators. The nickel metal compose hot-arm and cold-arm architecture. The two arms have different cross area so that the current flow this structure it would make the different temperature between them and cause the lateral displacement. Moreover, the vertical displacement is achieved by the second kind of design. Combing the two different directions actuators, the MEMS gripper is capable of two-dimensional manipulation. The in-plane and out-of-plane tip displacements are 83.7 μm at 0.6 V and 98 μm at 87.2 V, respectively. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/25873 |
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顯示於系所單位: | 光電工程學研究所 |
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