| dc.description.abstract | In this thesis presents a periscope type of twelve times zoom lens for eight mega pixel mobile phone camera. The zoom lens has four groups. The first group of zoom lens that has three piece of lenses and a right angle prism is fixed. The second group of zoom lens has four piece of lenses. The third group of zoom lens has three piece of lenses. The fourth group of zoom lens has two piece of lenses. The zoom lens has a half field of view of 30o to 2.7552o, a focal length range of 4 mm to 48 mm, a F/# of 3 to 5.6, the thickness of 12 mm and the total length of 67.1 mm.
In this zoom lens, we divided five segment analysis depend on effective focal length. The effective focal length is 4 mm, 15 mm, 26 mm, 37 mm, 48 mm. The F/# of Zoom1 is 3, and the minimum MTF is 0.508 at 118 lp/mm in Zoom1. The F/# of Zoom2 is 3.65, and the minimum MTF is 0.578 at 97 lp/mm in Zoom2. The F/# of Zoom3 is 4.3, and the minimum MTF is 0.568 at 82 lp/mm in Zoom3. The F/# of Zoom4 is 4.95, and the minimum MTF is 0.605 at 71 lp/mm in Zoom4. The F/# of Zoom5 is 5.6, and the minimum MTF is 0.535 at 63 lp/mm in Zoom5. The maximum absolute value of the difference between the tangential MTF and sagittal MTF is 4.1% in Zoom1. The maximum value of the optical distortion is -1.999% in Zoom1. The maximum value of the lateral color is 3.9 μm in Zoom1. The minimum value of the relative illumination is 60.834% in Zoom1. | en_US |