[2] [2] ZENG Z, PENG R L, HE M. Effect of oil liquid viscosity on hysteresis in doubleliquid variablefocus lens based on electrowetting[C]Proceedings of SPIE International Conference on Optical Photonics Engineering. Chengdu, China: SPIE, 2017: 1025012.

[4] PENG R L, WANG D Z, CHEN J B. Electrically-controlled and liquid-based optical imaging apparatus[J]. Acta Photonica Sinica, 39, 1836-1839(2010).

[5] [5] OH S H, SEO J H, JEON J P, et al. Liquid lens based on electromagic actuation f highperfmance miniature cameras[C]Proceedings of the 18th International Conference on Solidstate Senss, Actuats Microsystems. Anchage, AK, USA: IEEE, 2015: 2077 2080.

[12] KOPP D, BRENDER T, ZAPPE H. All-liquid dual-lens optofluidic zoom system[J]. Applied Optics, 56, 3758-3763(2017).

[15] LI H Z. Design of three-group flexible high ratio zoom optical system[J]. Laser & Optoelectronics Progress, 53, 122203(2016).

[17] XIE Y Y, LI X N. Quantitative formula for automatic focimeter[J]. Journal of University of Shanghai for Science and Technology, 35, 161-164(2013).