Reduction of Stray Light Effect Using Coatings in Cell Phone Lense

• Main Authors: Jia-Lung Hung, 洪嘉隆
• Other Authors: 謝振榆
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/8t5q7f

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所在職專班 === 100 === 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.