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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65208

    Title: 超大景深(多段式,物距無窮遠至10mm)手機鏡頭設計
    Authors: 黃凱章;Huang,Kai-chang
    Contributors: 光電科學與工程學系
    Keywords: 超大景深;多段式;Autofocus
    Date: 2014-07-30
    Issue Date: 2014-10-15 14:43:17 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本設計是以自動對焦手機鏡頭設計為主,物距是從無窮遠至9.754 mm,此最短距離為2倍焦距長之手機鏡頭設計。ㄧ般物距越短,其主光線與邊緣光線高度與角度會漸漸變化,造成真實f/#會變大及像差也會有所改變,由其是物距越短變化越大,我們為了區隔此變化,依據物距變化分成兩部分分析。當物距從無窮遠至100 mm 距離,要求MTF大於50%,在空間頻率114 lp/mm 位置之超大景深要求,我們分別對物距無窮遠、1500 mm、550 mm、325 mm等做分析。至於物距在100 mm至9.754 mm,其MTF變化很大。如物距為100 mm, MTF為50.9%,在空間頻率114 lp/mm 位置,其物方解析度為592 dpi;當物距在9.754 mm時,其放大率為-1,其MTF 為42.5%,在空間頻率14 lp/mm 位置,其物方解析度為711 dpi。

    ;The design is based on the cell phone camera of autofocus . The camera can take pictures from infinity to10 mm (distance of two times focal length). In order to achieve the goal of great depth of field, we requisite the MTF of the object distance from infinity to 10 mm more than 50% in 114 line pair per mm. The object distance for quantity of camera and first order calculation is divided into several parts such as Infinity(for scenery)、1500 mm(for Group Photo)、550mm(selfie)、325 mm(photo A4 document)..etc.
    As to the object distance from 100 mm to 10mm, the optical quality we want is MTF higher than 40 percent and DPI is greater than 300. For example, we require that when the spatial frequency is 14 lp/mm which means DPI is 711, MTF should greater than 40 percent.
    Appears in Collections:[光電科學研究所] 博碩士論文

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