4-bit digital liquid lens for variable focal length

Author(s):  
Dong Woo Lee ◽  
Young-Ho Cho
Keyword(s):  
2010 ◽  
Vol 6 (4) ◽  
pp. 141-144 ◽  
Author(s):  
Sang Won Seo ◽  
Seungoh Han ◽  
Jun Ho Seo ◽  
Woo Bum Choi ◽  
Man Young Sung

2015 ◽  
Author(s):  
Chenguang Zhang ◽  
Yiquan Liu ◽  
Jianguo Xin

2015 ◽  
Author(s):  
YiQuan Liu ◽  
ChenGuang Zhang ◽  
JianGuo Xin

2013 ◽  
Vol 15 (2) ◽  
pp. 025707 ◽  
Author(s):  
Runling Peng ◽  
Dazhen Wang ◽  
Zhiwei Hu ◽  
Jiabi Chen ◽  
Songlin Zhuang
Keyword(s):  

2008 ◽  
Vol 1075 ◽  
Author(s):  
Sangwon Seo ◽  
Seungoh Han ◽  
Jun-Ho Seo ◽  
Young-Mok Kim ◽  
Moon-Sik Kang ◽  
...  

ABSTRACTThe liquid lens based on MEMS technology can be an appropriate solution to improve the imaging capability of a capsule endoscope because it can be realized small enough and also consume negligible power. In this paper, a cylinder-type liquid lens was designed to minimize the dead area and then fabricated with MEMS technology combining the silicon thin-film process and the wafer bonding process where the multiple dielectric layer of Teflon, silicon nitride and thermal oxide was formed on the cylinder wall. The focal length of the lens module including the fabricated liquid lens was changed reproducibly as a function of the applied voltage. With the change of 30V in the applied bias, the focal length of the constructed lens module could be tuned in the range of about 42cm. The fabricated liquid lens was also proven to be small enough to be adopted in the capsule endoscope, which means the liquid lens can be utilized for the imaging capability improvement of the capsule endoscope.


2014 ◽  
Vol 598 ◽  
pp. 371-374
Author(s):  
Yu Wang ◽  
Wei Wang ◽  
Xu Zhou ◽  
Fu Long Zhai

In this paper, a variable-focus ultrasonic liquid lens controlled by the external voltage is demonstrated. That is, the liquid lens can be reshaped with the external voltage, which will cause the focal length to change. The relationship between liquid lens’ shape and the control voltage was obtained. The influence factors of the response time were researched. And the distribution of the ultrasonic field after the lens under different external control voltages was simulated.


Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 714
Author(s):  
Kari L. Van Grinsven ◽  
Alireza Ousati Ashtiani ◽  
Hongrui Jiang

Tunable-focus liquid lenses provide focal length tuning for optical systems, e.g., cameras, where physical movement of rigid lenses are not an option or not preferable. In this work we present a magnetically actuated liquid lens utilizing the Lorentz force to vary the focal length as the current through the system is varied. The resulting lens can operate as both a diverging and a converging lens depending on the direction of current applied and has a large range of focal lengths, from −305 mm to –111 mm and from 272 mm to 146 mm. We also characterized the aberrations of the lens during the actuation with a Shack–Hartmann wavefront sensor, and utilized the lens for imaging, during which we measured a resolution of 7.13 lp/mm.


2011 ◽  
Vol 403-408 ◽  
pp. 4388-4397
Author(s):  
Xiao Hu ◽  
Jiu Li ◽  
Jin Feng Liu ◽  
Zi Qiang Huang

A novel double liquid lens based on Electrowetting-On-Dielectric (EWOD) is presented and analyzed. The special construction is that the lens was divided into four quadrants. The particular fabrication process is presented to achieve the structure. It was proved that the lens not only expressed the electric zoom character but also shifted focal point away from optical axis. It also achieved an infinite focal length under zero electric field. The paper presented the relationship between the focus length and applied voltage, also gave the association between focus length and the applied voltage from 0V to 80V. We analyzed how the optical axis shifted according to the voltage difference between quadrants, furthermore, explained the new function that the focus object was away from center of lens.


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