- 學位論文
利用光學鍍膜改善手機鏡頭之雜散光
Reduction of Stray Light Effect Using Coatings in Cell Phone Lense
摘要
目前光學鏡頭的應用非常廣泛，諸如手機、相機、投影機及液晶螢幕等，而他們的成像都有鬼影和雜散光產生使得影像變得不清晰，因此我們在鏡片上做處理，以優化其影像畫質。這裡，我們應用光學薄膜理論作為鍍膜技術的基礎，以及使用成像品質的光學軟體來優化設計，並且降低鏡片上的雜散光產生。而鍍膜設計層數分別為四和六層架構，且利用光譜儀實測後，發現在波長範圍450nm ~ 660nm的平均反射率可分別減少為0.73％~0.76％ 以及0.43％~0.48％。顯示在六層的鍍膜架構下，可以有效降低其平均反射率，但鬼影和雜散光的現象依然存在。故再一次利用光學鏡片軟體改善鬼影和雜散光現象，經過光學鏡片軟體改善後可將光線聚焦在相同的位置上，而且有一個較佳鬼影比值為0.00006，顯示鬼影可有效的被改善。因此，此設計能實際的應用在光學鏡頭上。 在本文最主要探討手機鏡頭，塑膠鏡片內部所產生的雜散光及鬼影。目的是為了將鬼影及雜散光的產生到最低，利用鍍膜技術鍍上抗反射膜，以及運用光學鏡片軟體輔助，以達到優化的效果，本文中明確展現了其成效，因此可利用此結果在爾後鏡頭之塑膠鏡片製造上可以有所幫助。
並列摘要
Currently, there is a broad application using optical lenses. They are cellular phones, cameras, projectors, monitor etc.; however, their images exhibit ghosting and flare effect. They are subject to unclear images; therefore, there is a need for improving and optimizing lens properties. With the aid of using optical software and optical thin film coating technology, a design with reduced ghosting can be achieved, also reducing stray light generated on the lenses. By introducing spectroscopy measurement (wavelength ranging from 450nm to 660nm) of four to six layers coatings, the average reflectivity can be reduced from 0.73% to 0.76% and 0.43% to 0.48%, respectively. When using six-layer coating lens, the reflectivity can be significantly reduced, but ghosting and flare still persist. If an optical optimization software is utilized for thin film coating design and assuming that these incident lights are being focused at the same location, the ratio of ghosting is decreased to 0.0006, which is a substantial improvement. With these improvements, this design is practically applicable to optical lenses. We mainly focus on the ghosting and flare induced in cell phone and plastic lenses. The goal is to reduce the ghosting and flare effect at most; optimization is achieved by using the anti-reflective coating of thin film, with the help from the use of lens design software in order to sustain optimal solution. The effectiveness of the proposed scenario is demonstrated; it can be applied in the manufacturing process of plastic lenses.