- 學位論文
手機鏡頭的雜散光抑制研究
Study on Stray Light Suppressing in Cell Phone Lens
摘要
手機鏡頭中的雜散光構成因素不同於相機鏡頭與投影機鏡頭，傳統相機與投影機鏡頭雜散光發生時，光線多經由鏡筒反射或邊緣漏光所造成，若改變鏡筒擋光板(baffle)結構形狀或追加遮光片(sheet)改變口徑大小，可以減輕大部分的雜散光；手機鏡頭因為尺寸的縮小，鏡片邊緣形狀結構也會引發出反射造成雜散光。除了改變遮光片的口徑大小與改變擋光板上形狀結構外，在本論文中，我們研究利用改變鏡片有效徑外的形狀結構，來抑制雜散光。本文以兩片式百萬畫素手機鏡頭實驗，模擬分析雜散光的路徑，並以傳統手法做初步改善，再配合鏡片形狀變更的新手法達到更佳的狀態；以傳統遮蔽手法縮小口徑時，可以將原本雜散光平均能量比0.083％的鏡頭改善到0.019％，若再經由鏡片有效徑外的形狀結構改變，將可改善到雜散光平均能量比0.003％的程度。
並列摘要
The stray light problem in the cell phone lens differs from those in a camera and a projector. The stray light in a camera or a projector normally is caused by the cone reflection or light leak of a rim. If we change the structure and shape of baffle or reduce the length of diameter of a sheet, the stray light can be avoided to a certain level. For the cell phone lens, due to its small size, the rim structure of lens may cause light reflection and lead to stray light. In this thesis, besides reducing the diameter of a sheet or changing the structure and shape of a baffle, we study the method on suppressing the stray light by changing the lens structure outside the effective diameter. IA two-piece lens for mega pixel cell phones is used in our experiment. We perform the simulation of the trace of stray light for and use traditional methods to make primary improvement. Then, we perform adjustments based by change the shape of lens rim. When traditional method of reducing the size of effective diameter is applied, the average stray light energy is improved from 0.083% to 0.019%. By changing the lens structure outside the effective diameter, the average stray light energy is further reduced to 0.003%.