Li Heng, Cheng Xuemin, Hao Qun
School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China.
Graduate School at Shenzhen, Department of Precision Instrument, Tsinghua University, Shenzhen 518055, China.
Sensors (Basel). 2015 Dec 31;16(1):45. doi: 10.3390/s16010045.
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.
提出了一种采用两个液体透镜和两个固定透镜组的四组稳定变焦系统。我们描述了一个5.06:1变焦系统的设计原理、实现方法和测试情况。实现的有效焦距（EFL）范围为6.93毫米至35.06毫米，视场（FOV）范围为8°至40°。当液体透镜1（L₁）的光焦度取值从0.0087毫米⁻¹到0.0192毫米⁻¹，且液体透镜2（L₂）的光焦度取值从0.0185毫米⁻¹到 -0.01毫米⁻¹时，该系统能够快速变焦。所实现的变焦系统的响应时间小于2.5毫秒，稳定时间小于15毫秒。对元件参数的分析和透镜性能的测量不仅进一步验证了设计原理，还展示了使用两个液体透镜的变焦过程。考虑到该系统快速、可靠且微型化，它对运动载体（如机器人、地面车辆和无人机）很有用。
