Citation: | HU Shen-bao, ZHANG Jing, ZHANG Gong, ZHANG Jun-ming, ZHANG Yan. Design of visual optical system based on Varifocal zoom structure[J]. Chinese Optics. doi: 10.37188/CO.2024-0176 |
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 been 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 5.6 mm 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.
[1] |
王婉珠, 李爱华, 倪连红. VTS4疗法联合传统综合疗法治疗屈光不正性弱视的效果[J]. 中国医学创新,2023,20(15):107-110.
WANG W ZH, LI A H, NI L H. Effect of VTS4 therapy combined with traditional comprehensive therapy in the treatment of ametropia amblyopia[J]. Medical Innovation of China, 2023, 20(15): 107-110. (in Chinese).
|
[2] |
迟英杰, 王华君, 李霄, 等. 视觉训练系统联合传统综合疗法对屈光不正性弱视治疗的临床效果评价[J]. 中华实验眼科杂志,2022,40(6):451-457.
CHI Y J, WANG H J, LI X, et al. Clinical evaluation of vision therapy system 4 combined with traditional comprehensive training for ametropic amblyopia[J]. Chinese Journal of Experimental Ophthalmology, 2022, 40(6): 451-457. (in Chinese).
|
[3] |
黄艳, 李雪瑶, 刘庆. 视觉功能训练系统在屈光性弱视患儿治疗中的应用效果[J]. 中国卫生标准管理,2023,14(13):1-5.
HUANG Y, LI X Y, LIU Q. Effectiveness of visual function training system in the treatment of children with refractive amblyopia[J]. China Health Standard Management, 2023, 14(13): 1-5. (in Chinese).
|
[4] |
杨翠. 基于IPMC驱动的可变焦微透镜的研究[D]. 太原: 太原理工大学, 2021.
YANG C. Research on variable focal microlens driven by IPMC[D]. Taiyuan: Taiyuan University of Technology, 2021. (in Chinese).
|
[5] |
HAO Q, CHEN CH X, CAO J, et al. Ultra-wide varifocal imaging with selectable region of interest capacity using Alvarez lenses actuated by a dielectric elastomer[J]. Photonics Research, 2022, 10(7): 1543-1551. doi: 10.1364/PRJ.455331
|
[6] |
卞旭琪. 自由曲面变焦成像系统的研究[D]. 苏州: 苏州大学, 2017.
DIAN X Q. Research on freeform varifocal optical imaging systems[D]. Suzhou: Soochow University, 2017. (in Chinese).
|
[7] |
ALVAREZ L W. Two-element variable-power spherical lens: US, 3305294[P]. 1967-02-21.
|
[8] |
BARBERO S, RUBINSTEIN J. Adjustable-focus lenses based on the Alvarez principle[J]. Journal of Optics, 2011, 13(12): 125705. doi: 10.1088/2040-8978/13/12/125705
|
[9] |
HOU CH L, XIN Q, ZANG Y. Optical zoom system realized by lateral shift of Alvarez freeform lenses[J]. Optical Engineering, 2018, 57(4): 045103.
|
[10] |
蒋婷婷, 冯华君, 李奇. 自由曲面变焦的内调焦式光学系统设计[J]. 红外与激光工程,2021,50(4):20200290. doi: 10.3788/IRLA20200290
JIANG T T, FENG H J, LI Q. Design on internal focusing optical system with zoom lens of freeform[J]. Infrared and Laser Engineering, 2021, 50(4): 20200290. (in Chinese). doi: 10.3788/IRLA20200290
|
[11] |
蒋婷婷, 徐之海, 李奇. 基于五阶自由曲面垂轴偏移的空间相机变焦方法[J]. 飞控与探测,2023,6(2):18-22.
JIANG T T, XU ZH H, LI Q. Zooming method for space cameras based on lateral shift of fifth-order free-form lenses[J]. Flight Control & Detection, 2023, 6(2): 18-22. (in Chinese).
|
[12] |
欧阳琦, 柳萌遥, 宁妍, 等. 基于Alvarez透镜的紧凑型红外连续变倍系统设计[J]. 激光与光电子学进展,2024,61(10):1022001.
OUYANG Q, LIU M Y, NING Y, et al. Design of a compact infrared continuous optical zoom system based on Alvarez lenses[J]. Laser & Optoelectronics Progress, 2024, 61(10): 1022001. (in Chinese).
|
[13] |
CAMPBELL C E. Conditions under which two-element variable power lenses can be created. Part 1. Theoretical analysis[J]. Journal of the Optical Society of America A, 2011, 28(10): 2148-2152. doi: 10.1364/JOSAA.28.002148
|
[14] |
CAMPBELL C E. Conditions under which two-element variable power lenses can be created. Part 2. Application to specific designs[J]. Journal of the Optical Society of America A, 2011, 28(10): 2153-2159. doi: 10.1364/JOSAA.28.002153
|
[15] |
罗宇杰. 紧凑型无盲区全景成像光学系统及其变焦组件设计研究[D]. 杭州: 浙江大学, 2018.
LUO Y J. Design of compact non-blind area PAL system and its zoom elements[D]. Hangzhou: Zhejiang University, 2018. (in Chinese).
|
[16] |
禹静. 自由曲面镜片评价方法的研究[D]. 天津: 天津大学, 2015.
YU J. Study on evaluation method of freeform spectacle lenses[D]. Tianjin: Tianjin University, 2015. (in Chinese).
|
[17] |
华芳芳, 禹静, 李东升. 渐进多焦点镜片光学系统MTF评价的仿真分析[J]. 光学技术,2018,44(6):709-716.
HUA F F, YU J, LI D SH. Research on MTF evaluation method of progressive addition lenses[J]. Optical Technique, 2018, 44(6): 709-716. (in Chinese).
|
[18] |
张梅. 基于个性化眼光学结构的人眼色差的研究[D]. 天津: 南开大学, 2010.
ZHANG M. Research on chromatic aberration of human eye based on individual eye[D]. Tianjin: Nankai University, 2010. (in Chinese).
|