- 學位論文
應用液態透鏡及機械式移動方式實現超廣角變焦鏡頭
The optical design of a zoom ultra wide angle lens by using liquid lens and mechanical motion technologies
摘要
隨著科技的發展進步與產品的推陳出新，人們對於視覺享受要求越來越高，甚至為了增加視場角度，許多雙鏡頭模組的設計也因應而出，增加光學元件成本與高運算量且複雜的影像處理技術。超廣角變焦鏡頭理念，在焦距最短時，將得到最廣範圍監控，若要觀察遠處某一點時我們可以透過光學變焦，使得焦距變長，達到望遠的功能，此時就必須犧牲點視場角，但視場角的減少會使得畸變減少，畸變的減少將減少後端影像處理複雜度，也可以得到更清楚的影像。 在這項研究中，提出了液態透鏡和機械移動技術超廣角變焦鏡頭的光學設計。在第一個光學設計中，我們使用液態透鏡作為超廣角鏡頭的變焦分量。在第二個光學設計中，我們利用透鏡之間的移動來實現光學變焦功能。 在液態透鏡設計中，我們引入兩個實例，即：兩組液態透鏡和四組液態透鏡，用於實現光學變焦功能。三種實例都具三段式變焦，分別為170度、160度、150度。我們將兩組和四組液態透鏡作為變焦鏡頭成功地應用於超廣角鏡頭，但性能受限於液態鏡頭焦距範圍和小孔徑尺寸，因此成像質量不容易提高。當我們使用變焦超廣角鏡頭系統的機械移動設計時，鏡頭總系統長度在19mm以內， 方面控制小於±5%且相對照度有90%以上的表現，在MTF方面，於各個視場角在空間頻率180 lp/mm時均可達到37%以上，光斑大小在5.0μm內，橫向色差小於±2μm。比較其他研究，本研究提出的變焦超廣角鏡頭系統的機械移動設計不僅可以保持圖像質量，而且通過鏡組之間的移動實現光學變焦功能。
並列摘要
With the development of science and technology and product innovation, people for the visual enjoyment requirements are getting higher and higher. Even in order to increase the field of view, dual lens module design is developed and hence increases the cost of optical components and high computational complexity of complexity image processing technology. The concept of ultra-wide angle zoom lens is that the shortest focus lead to most extensive range of monitoring. We can through the optical zoom to make the focal length longer to achieve telephoto function, but it sacrifices the view angle. When we reduce field of view, it makes the distortion reduced and reduces the complexity of back-end image processing. In this study, the optical design of the liquid lens and mechanical motion technologies of zoom ultra-wide-angle zoom lens is proposed. At the first optical design, we use the liquid lens as zoom component into the ultra wide-angle lens. In the second optical design, we use of the movement between the lens to achieve optical zoom function. In the liquid lens design, we introduce two examples i.e., 1. two groups of liquid Lenses and four groups of liquid lenses for realizing optical zoom function. Hence, there are three examples with three sections of zoom, i.e., 170 degrees, 160 degrees and 150 degrees, respectively in the thesis. We adopt two groups and four groups of liquid lens as zoom lens into the ultra wide-angle lens successfully, but the performance is limited liquid lens focal length range and small aperture size and hence, the imaging quality is not easy to improve. When we use mechanical motion design scheme of zoom ultra wide-angle lens system, the total lens system length is within 19mm. Distortion control less than ± 5% and relative illumination is more than 90%.In all field of view, the MTFs are more than 37% when the spatial frequency of 180 lp/mm, the spot size are less than 5.0 μm, the lateral color are less than ± 2 μm. With comparisons of other researches, the proposed mechanical motion design scheme of zoom ultra wide-angle lens system not only maintains the image quality, but also achieves the optical zoom function by the motion between the lens groups.