An Electrically Tunable Zoom System Using Liquid Lenses

Sensors

Heng Li¹  Xuemin Cheng²  Qun Hao¹ 

[1] School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;Graduate School at Shenzhen, Department of Precision Instrument, Tsinghua University, Shenzhen 518055, China;

关键词: optical imaging;    liquid lens;    stabilized zoom system;    Gaussian bracket;   

DOI  :  10.3390/s16010045

来源: mdpi

【 摘 要 】

A four-group stabilized zoom system using two liquid lenses and two fixed lens groups is proposed. We describe the design principle, realization, and the testing of a 5.06:1 zoom system. The realized effective focal length (EFL) range is 6.93 mm to 35.06 mm, and the field of view (FOV) range is 8° to 40°. The system can zoom fast when liquid lens 1’s (L₁’s) optical power take the value from 0.0087 mm⁻¹ to 0.0192 mm⁻¹ and liquid lens 2’s (L₂’s) optical power take the value from 0.0185 mm⁻¹ to −0.01 mm⁻¹. Response time of the realized zoom system was less than 2.5 ms, and the settling time was less than 15 ms.The analysis of elements’ parameters and the measurement of lens performance not only verify the design principle further, but also show the zooming process by the use of two liquid lenses. The system is useful for motion carriers e.g., robot, ground vehicle, and unmanned aerial vehicles considering that it is fast, reliable, and miniature.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.