光學鏡片非球面係數逆向工程及光學軟體模擬分析

手機加入照相的功能已經是必備，而照相鏡頭勢必要求輕薄短小、低價格、高攝影品質，要符合這些要求，在鏡頭中加入非球面塑膠鏡片就成了必須性的做法。非球面塑膠鏡片在射出成形過程中會因塑膠材料的特性、成形時的設定參數(溫度、壓力、射出速度等) 影響塑膠收縮，造成形狀精度與設計值有所誤差，而這一誤差值影響成像品質有多大，是否需要進行模仁補償來改善形狀精度?若可以先模擬得知其結果，將可減少許多開發的時間及成本。此研究是利用Form Talysurf 儀器進行非球面資料點的截取，再以數值方法軟體MATLAB之曲線擬合工具逆向求出非球面係數(R,K,A2,A4,A6,…,A20)，然後將此非球面係數代入光學設計軟體(CODE V)模擬分析，若分析結果是成像品質低落，就對此鏡片作誤差補償;若影響不大，就朝其它因素去改善。最後，將利用此法對一顆已量產的非球面手機鏡頭(1P)，作一逆向工程，並且將此逆向工程的結果實作，驗證此法的可信性。其次將設計一手機鏡頭 (3P) ，並設計在實際可能遇到的形狀精度，來探討塑膠非球面鏡片之形狀精度，對光學成像品質的影響。

關鍵字

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並列摘要

Photographic capability is one of the essential functions to mobile phone nowadays. Lens of camera installed on a mobile phone is required light in weight, thin, short, small, low cost, and high quality of photographing. In order to achieve all requirements, adding a plastic aspheric lens on a camera becomes necessary. While formation of the plastic aspheric lens, various plastic materials and controlled parameters such as temperature, pressure, and injection velocity will affect the degree of plastic condensation causing the shape inaccuracy and error compared with the original design data. How deep affection would be caused by the shape inaccuracy and error on the picture quality? Would it be needed to improve the shape accuracy by modifying the core of injection casting? If the final result could be simulated, it would reduce lots of development(manpower) cost and time. This study is using the Form Talysurf instrument to acquire the coordinate of all points over the surface of an aspheric lens. Using numerical software MATLAB to fit the function curve with all co-ordinates to reverse and obtain the coefficient of the aspheric lens (R, K, A2, A4, A6,…,A20). Afterwards, applying the coefficient to the optic design software (CODE V) to perform the simulation analysis. If the analytic result shows a low quality of picture, action of error compensations for lens will be taken. If the above affection is not the main issue, other factors will be considered for further improvement/adjustment. Finally, in order to verity the reliability of this approach, a practical reverse engineering will be performed by using an aspheric optical lens (1P) from a camera installed on a mass-produced mobile phone. In order to study the affection of picture quality from the shape accuracy of a plastic aspheric lens, a new optical lens (3P) for camera will be designed. For the plastic injection of the new designed optical lens, the associated parameters on the shape accuracy will be controlled and monitored.