表面聲波式觸控面板吸波材料之研究

表面聲波式觸控面板目前皆以手指作為面板觸碰源，因為人類皮膚俱有良好的吸收表面波能力。但對於市面上小尺寸或高解析度要求的觸控面板而言，為了減少觸碰時的接觸面積，觸控筆的使用，往往是必需的。找尋合適的吸波材質並以之製成觸控筆，是本文研究的目的。材料俱有吸波效果，將需考慮兩個方面：除了能使應力波傳遞至吸波介質時反射波儘量小，此介質尚需具備消耗波能量的效果。故使用橡膠此種黏彈性阻尼材料，分成單一材質吸波圓柱及雙層材質吸波圓柱來加以實驗分析。單一材質吸波圓柱是利用材料本身的阻尼特性，來達到散逸波能的目的，最終實驗結果顯示黏彈性材料每一振動週期中單位體積所消耗的能量，是影響其吸波耗能特性的關鍵；雙層材質吸波圓柱則是希望藉著結構上的設計，在忽略阻尼效應下，達到使應力波完全透射入吸波介質的目的，不過實驗結果輔以考慮阻尼效應的透射率推導，黏彈性材料無法達到應力波的完全透射。最後成功由單一材質吸波圓柱部份，找到了吸波效能足以用作表面聲波面板觸控筆材質，蕭氏硬度10A的TPE材料，並將之製成觸控筆成品。

關鍵字

表面聲波式；觸控面板；觸控筆；吸波材料；阻尼；雙層材質吸波圓柱

並列摘要

SAW touch panels now on the market mostly have the panel touch source based on user’s fingers. This is mainly because human skin can absorb surface wave with a desired effect. However, for the touch panels of smaller sizes or required a higher resolution, in order to reduce the touch area during contact, use of a stylus often is necessary. The objective of this research is to find out desirable wave-absorbing material to make stylus. For material to have wave absorbing capability, two aspects have to be considered: first, reflective wave should be as small as possible when stress wave is transmitted to the wave absorbing medium; second, the medium must be able to consume wave energy. Based on this consideration, a resilient damping material is being used, and wave absorbing cylindrical struts made from mono-material and wave absorbing cylindrical struts made from double-layer material have been formed to perform experiments and analysis. The wave absorbing cylindrical struts made from mono-material has damping characteristics to disperse wave. Experiment results indicate that the energy consumed by each unit of volume the resilient material in each vibration period is a critical factor affecting its wave absorbing characteristics. On the wave absorbing cylindrical struts made from double-layer material, the aim is adopting a structural design to allow the stress wave to fully penetrate in the wave absorbing material by neglecting the damping effect. However, deduction based on experiment results and transmission coefficient of the damping effect shows that the resilient material cannot achieve a total penetration for the stress wave. However, by adopting the mono-material wave absorbing cylindrical struts, a desired wave absorbing effect is achieved so that it can be used as the material to make the surface sound wave touch panel. The TPE material thus formed has Shore hardness of 10A. And a finished product of stylus can be made accordingly.

並列關鍵字

SAW touch panel ； stylus ； wave-absorbing material ； wave absorbing medium ； double-layer material

參考文獻

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國際替代計量

表面聲波式觸控面板吸波材料之研究

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