| 摘要: | 本論文使用8個數位攝影鏡頭之設計進行鏡頭長度的分析與像面彎曲探討，分別為30萬畫素的兩個設計、100萬畫素的一個設計、200萬畫素的四個設計與200萬畫素像面彎曲的一個設計。
在30萬畫素的兩個設計中，將半視角從20度增加到30度，使得有效焦距變短，鏡頭長度從12.964 mm縮短為8.439 mm，再選擇較小的單一畫素大小，將成像高度變小，進行100萬與200萬畫素的第一個設計，其鏡頭長度分別為5 mm與2.65 mm，在200萬畫素的第二個設計中，以達到相對照度的要求下，將半視角增加至32度，使得鏡頭長度縮短為2.447 mm，在200萬畫素的第三與第四個設計中，縮短後焦距並探討鏡片之折光率、主平面間距、厚度、折射率與第二主平面的關係，其鏡頭長度分別為2.14 mm與2 mm。
當鏡頭長度越薄，像方主光線角度會越大，造成相對照度下降，場曲也同時變大，導致成像品質下降，所以鏡頭長度的縮短是有一個限制的，在200萬畫素像面彎曲的設計中，其像面的曲率半徑為-6.318 mm，修正了像方主光線角度過大的問題，並且補償場曲造成的像差，使得成像品質提高。
;This paper uses eight digital photographic lens designs to analyze the overall length of the lens and the curved imaging surface, which are two designs of VGA, one design of 1 million pixels, four designs of 2 million pixels, and one design imaging on a curved surface of 2 million pixels.
In the two designs of VGA, increasing the half field angle from 20 degrees to 30 degrees make the effective focal length shorter, so the overall length is from 12.964 mm to 8.439 mm. Then select the smaller pixel size and reduce the imaging height to do the 1 million and the first design of 2 million pixels. The overall length of the lens is 5 mm and 2.65 mm, respectively. In the second design of 2 million pixels, the half field angle was increased to 32 degrees under the requirement of relative illumination, which shortened the overall length of the lens to 2.447 mm. In the third and fourth designs of 2 million pixels, shorten the back focal length and discuss the relationship between the power, the principal plane spacing, the thickness, the refractive index and the second principal plane of the lens. The overall length of the lens is 2.14 mm and 2 mm, respectively.
When the overall length of the lens is thinner, the chief ray angle will be larger, so the relative illumination decreases. When the field curvature also increases, the image quality decreases. Therefore, there is a limit to shortening the overall length. In the design imaging on a curved surface of 2 million pixels, the radius of curvature of the image surface is -6.318 mm, which corrects the problem of the chief ray angle too large, and compensates for the aberration caused by the field curvature, so that the image quality is improved. |
