15 October 2012 Optical and mechanical design of 10X zoom lens for low-vision devices
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Abstract
Video magnifiers as a low-vision devices require special zoom lens which has finite conjugate distance for shooting close object. Unlike the zoom lens using zoom cam developed previously, here the optical and mechanical design of zoom lens which is driven by stepping motor and has the potential to realize auto-focus and manual-focus is introduced. This mechanical compensated zoom lens which has a tube length of 81.8 mm and a front intercept distance of 310 mm comprises four groups which are objective, variator, relay and compensator. The optical system can realize continuous zoom from 9.6~186 mm and 10X zoom ratio with stable image quality. System performance is evaluated by using modulation transfer function (MTF), diffuse spot in diameter and tolerance sensitivity analysis. The mechanical structure designed to realize auto-focus and manual-focus function of the zoom lens is depicted in detail.
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Yiyu Li, Chuan Hu, Jiaojie Chen, Haihua Feng, Yuanyuan Wang, Fan Lu, "Optical and mechanical design of 10X zoom lens for low-vision devices", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84190R (15 October 2012); doi: 10.1117/12.970484; https://doi.org/10.1117/12.970484
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