數位相機閃光燈透鏡之照度均勻化的結構設計; The structual design of digital camera flash lens for the illumination uniformity.

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题名:	數位相機閃光燈透鏡之照度均勻化的結構設計;The structual design of digital camera flash lens for the illumination uniformity.
作者:	許朝昇;Chao-shen Hsu
贡献者:	機械工程研究所碩士在職專班
关键词:	照度;均勻性;閃光燈;透鏡;結構設計;structual design;illumination;flash light;lens
日期:	2011-06-21
上传时间:	2012-01-05 12:27:44 (UTC+8)
摘要:	隨著數位相機的普及化，人們對於攝影越來越不陌生，隨手留下紀錄，成為生活的一部分。而閃光燈則是數位相機相機不可或缺的一部分，對於拍攝主體具有補光的效果。為了產生高能量的補光效果，必須有效地聚集光線。　現有的閃光燈透鏡之設計上，大部份著眼於有效地聚集光線，以產生高能量的輸出，使得照度分佈之光型小而集中。而分佈過於集中，往往對於成像造成曝光過度、色偏、解析度降低及暗角等現象，而影響影像之品質。為了改善此現象，必須透過閃光燈透鏡之設計，來提升分佈之均勻性。　本研究針對數位相機的內建閃光燈模組之透鏡設計，分別以氙氣燈管及白光LED做為光源，將單一光源分割為區域光源，針對區域內光線之分佈特性，設計透鏡之表面微結構，最後再整合成複合透鏡。透鏡透過光學軟體之模擬，在有效距離2.5m，在2m×1.5m的有效範圍內，得到以下的結果：以氙氣燈管為光源所設計之複合透鏡均勻度為82.6%;以白光LED為光源所設計之複合透鏡均勻度為85%。　複合透鏡之模擬結果與現有的閃光燈透鏡之比較，在照度分佈的均勻性上，有顯著之提升。　As the population of digital camera, people are more familiar with the photography. Recording everything in our daily life conveniently has become one part of our lives. Built-in flash module is one of the important parts of digital camera to increase the lighting of main subject. In order to producing high-energy filling light effect, we must gather light more efficiency. 　Most of designs on flash module focus on gathering light efficiency. By exporting high-energy light, we make the planar illumination narrow and concentrated. One the other hand, photo’s quality will decreased by concentrated light due to overexposing, low resolution, and dark corners. In order to improve this question, we need to increase the wise of planar illumination by redesigning the flash light module. 　In this study, the flash module of built- in digital camera lens is using xenon lamp and white LED as light source. We separated one light source into multi-region light source. For the distribution of light within the region, we change the structure of micro lens and integrate them into the compound lens. By the simulation software through the optical lens, in the effective distance of 2.5m and effective range of 2x1.5m, we get the following results: When using xenon light as light source, the uniformity of the compound lens is 82.6%; when using white LED light as light source, the uniformity of the compound lens is 85%. 　In conclusion, compound lens has a better illumination uniformity and significant upgrade comparing to the simulation results of existing flash lens.
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