本論文提出二倍變焦一百萬畫素膠囊內視鏡設計，為四片鏡片，含三片塑膠非球面與一片玻璃球面，採用三群鏡組的設計，第一群有兩片鏡片，第二群為一片鏡片，第三群為一片鏡片。本膠囊內視鏡主要觀測小腸，小腸半徑約12.5 mm，設物高為12.5 mm，物面為一曲面進行設計，曲率半徑為15 mm，變焦鏡頭之焦距範圍為1.064 mm ~ 2.039 mm，半視角範圍71.66至30，F/ 2.8 ~ F/ 3.5，變焦鏡頭長度為11.6 mm，鏡片最大有效口徑為6 mm。 本變焦鏡頭設計依放大率分為六段分析，即Zoom 1、Zoom 2、Zoom 3、Zoom 4、Zoom 5與Zoom 6，其放大率分別為-0.0845、-0.0984、-0.1150、-0.1317、-0.1482、-0.1690。Zoom 1至Zoom 2，F/#為2.8，其最大空間頻率為147 lp/mm，MTF最小為0.408，其切向MTF與徑向MTF絕對值的差值最大為0.078。Zoom 3 至 Zoom 4，F/#為3.2，最大空間頻率為132 lp/mm，MTF最小為0.447，其切向MTF與徑向MTF絕對值的差值最大為0.024。Zoom 5 至 Zoom 6，F/#為3.5，最大空間頻率為121 lp/mm，MTF最小為0.448，其切向MTF與徑向MTF絕對值的差值最大為0.053。Zoom 1 至 Zoom 6光學畸變，其最大值為-14.89%，在Zoom 1位置。Zoom 1 至 Zoom 6相對照度，其最小值為71.8%，在Zoom 1位置。Zoom 1 至 Zoom 6橫向色差，其最大值為1.5 μm，也在Zoom 1位置。 ;In this thesis, we present a two times zoom lens for a one mega pixel capsule endoscope camera. The zoom lens with three group employed in the capsule endoscope simply consisted of three piece of plastic aspherical lens and a piece of spherical lenses. The first group of zoom lens that has two piece of lenses. The second group and the third group of zoom lens has one piece of lenses.Capsule endoscopy is mainly used to observe small intestine.The radius of the small intestine is 12.5 mm so we set that object height is 12.5 mm, and proposes the object plane of intestine is a curved surface. The first order of zoom lens has a half field of view of 30o to 71.66o, a focal length range of 1.064 mm to 2.039 mm, a f-number of 2.8 to 3.5, total length of 11.6 mm, the maximum aperture of 6 mm. We divided the zoom lens into six-segment analysis depend on magnification. The magnification of six-segment zoom system is -0.0845, -0.0984, -0.1150, -0.1317, -0.1482, and -0.1690, respectively. The f-number of first zoom system and second zoom system is 2.8. The f-number of third zoom system and fourth zoom system is 3.2. The f-number of fifth zoom system and sixth zoom system is 3.5. The minimum MTF was 0.408 at 147 lp/mm in first zoom system. The maximum absolute value of the difference between the tangential direction MTF and the sagittal direction MTF is 0.078 in first zoom system.The maximum distortion is -14.89% in first zoom system. The minimum relative illumination is 71.8% in first zoom system. The maximum lateral color is 1.5μm in first zoom system.
