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Continuous zoom optical system with finite conjugate distance as an E-vision aid device |
WANG Yuan-yuan,L(U) Fan,CHEN Hao,ZHU De-xi,JIN Cheng-peng,LI Yi-yu |
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Abstract Objective To describe the principle and technique for designing a 10X continuous zoom optical system with a fixed finite conjugate distance as an E-vision aid device. Methods After the initial structure was designed by using Gaussian optics, optical design software was used to perform aberration correction and optical property evaluation which included modulation transfer function (MTF), spot diagram and diffuse spot diameter. The performance stability of the system was predicted by using a tolerance sensitivity analysis and the Monte Carlo method. Results The mechanically compensated zoom lens designed for an E -vision aid device combines four group components: a fixed front group, a moving variator, a fixed middle group and a compensator that includes a total of 10 lenses, an optical tube length of 84 mm and a front intercept distance of 316 mm. The zoom lens could achieve 10-60 mm continuous zoom and a magnification range from -0.03 to -0.3 without any image vignetting or obvious fluctuation in image quality. Conclusion A continuous zoom optical system with a fixed finite conjugate distance and large zoom ratio can be designed for an E-vision aid device with the help of Gaussian optics and aberration theory.
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Received: 14 May 2010
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