離子高分子金屬化合物應用於光學變焦模組及其可靠性測試

一般傳統上的自動變焦系統是由一系列的透鏡組所組成，再藉由馬達或電磁驅動的方式來移動透鏡的位置達到變焦的效果，然而這種方式需要較大的空間，且重量也相對較重，不太適合現在微型鏡頭的趨勢，因此，我們設計了一款面鏡反射式的變焦系統，反射式的變焦系統除了能夠利用折疊光路來使空間的運用更有效率外，還可以有效降低色散的現象，對於現在的微型鏡頭來說，此設計可以更貼近輕薄短小。在這裡，我們使用一種離子性高分子金屬複合材料(IPMC)來製作可形變的面鏡，藉由改變面鏡的曲率來達到變焦的效果，利用遮罩的方式，可以定義出任意形狀的可形變面鏡，而因為這種材料的特性，我們可以用較低的電壓來達到較高的形變量，約3伏特就可以驅動。此外，為了使IPMC 的表面能夠當作光學反射面，我們使用聚二甲基矽氧烷(PDMS)來改善IPMC表面的粗糙度，使得粗糙度降低至18 nm 的程度，最後，我們把製作完成的可形變面鏡放入我們設計好的光學變焦模組裡面測試，分析所得的影像。

關鍵字

離子性高分子金屬複合材料；聚二甲基矽氧烷；可形變面鏡

並列摘要

In order to meet modern requirement, electronic products are made smaller and thinner. We used deformable mirrors (DMs) in optical systems that can make camera modules thinner and lighter in electronic products. An Ionic-Polymer Metal Composite (IPMC) plays the critical role in our design of deformable mirrors. It has good bending feature and can be driven by low voltage (usually less than 5 volts). Other technologies such as liquid lenses, MEMS deformable mirrors, and liquid crystal lens, all need higher voltage to reach similar optical power of IPMC. After fabrication of IPMC deformable mirrors, we used PDMS on one surface to improve the surface roughness before reflective metal is deposited. Key characteristics of IPMC deformable mirror are demonstrated in the paper. By coating a silver layer on the smoothed IPMC surface, the reflection is up to 90%. From simulation results, the zoom ratio of this module can be expected 1.8 times. Experimentally, the deformable mirror can be changed from flat to 65 diopters (m-1) by only 3 volts. In this paper, we demonstrated a reflective optical zoom module with three mirrors and two deformable mirrors.

並列關鍵字

ionic polymer metal composite (IPMC) ； polydimethyl siloxane (PDMS) ； deformable mirror

參考文獻

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[5] Huang, Y. H., Wei, H. C., Hsu, W. Y., Cheng, Y. C., & Su, G. D. J. (2014). Optical zoom camera module using two poly-dimethylsiloxane deformable mirrors. Applied optics, 53(29), H248-H256.

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離子高分子金屬化合物應用於光學變焦模組及其可靠性測試

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