基于Varifocal变焦结构视光学系统设计

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关键词：渐进多焦点；光焦度；Varifocal;Alvarez透镜；自由曲面中图分类号：TP394.1;TH691.9 文献标志码：A doi：10.37188/CO.2024-0176 CSTR：32171.14.CO.2024-0176

Abstract： Most of the current visual training products available on the market use electronic screens to display objects of varying dimensions and distances， thereby stimulating the ciliary muscle through looking at the screen for visual function training. However， this method involves blue light radiation， which poses a potential hazard to the human eye.To address this issue，a visual optical system based on a Varifocal zoom structure has ben designed. The system achieves continuous magnification of optical power by manipulating the lateral movement of two sets of lenses perpendicular to the optical axis.This simulates changes in object distance and stimulating ciliary muscle regulation training. This paper first derives the surface shape limits of variable focal length lenses，incorporates the variable focal length spherical effect equation to optimize the basic surface shape of Alvarez lenses， and uses Zemax software for design. The designed lens surface is characterized by a third-order XY polynomial free-form surface， with a maximum relative vertical axis offset of 5.6mm between the two groups of lenses， achieving continuous magnification of refractive power between +4D and -8D . The design results indicate that the full-field modulation transfer function exceeds 0.3 at a Nyquist frequency of 30lp/mm ， with root mean square （RMS） radius values approaching the Airy spot radius value and distortion below 2% . The imaging quality of this optical system is satisfactory. Key words： progressive multifocal; optical power; Varifocal; Alvarez lens; free-form surface

1引言

随着科技飞速发展和人们生活水平的提高，视光学产品的应用需求日益增长。（剩余10575字）