4-bit digital liquid lens for variable focal length

2009 ◽  
Author(s):  
Dong Woo Lee ◽  
Young-Ho Cho
Keyword(s):  
Focal Length ◽  
Liquid Lens

Liquid Lens Module with Wide Field-of-View and Variable Focal Length

2010 ◽  
Vol 6 (4) ◽  
pp. 141-144 ◽  
Author(s):  
Sang Won Seo ◽  
Seungoh Han ◽  
Jun Ho Seo ◽  
Woo Bum Choi ◽  
Man Young Sung
Keyword(s):  
Focal Length ◽  
Field Of View ◽  
Wide Field ◽  
Liquid Lens ◽  
Wide Field Of View

The analysis on the optical power of focal length tunable liquid lens

2015 ◽  
Author(s):  
Chenguang Zhang ◽  
Yiquan Liu ◽  
Jianguo Xin
Keyword(s):  
Focal Length ◽  
Optical Power ◽  
Liquid Lens

Low spherical aberration of the focal length tunable liquid lens

2015 ◽  
Author(s):  
YiQuan Liu ◽  
ChenGuang Zhang ◽  
JianGuo Xin
Keyword(s):  
Spherical Aberration ◽  
Focal Length ◽  
Liquid Lens

Focal length hysteresis of a double-liquid lens based on electrowetting

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

Low-Power Liquid Lens Having Si Cylinder Chamber for Capsule Endoscope

2008 ◽  
Vol 1075 ◽  
Author(s):  
Sangwon Seo ◽  
Seungoh Han ◽  
Jun-Ho Seo ◽  
Young-Mok Kim ◽  
Moon-Sik Kang ◽  
...  
Keyword(s):  
Wafer Bonding ◽  
Focal Length ◽  
Cylinder Wall ◽  
Capsule Endoscope ◽  
Silicon Thin Film ◽  
Imaging Capability ◽  
Liquid Lens ◽  
Thermal Oxide ◽  
Mems Technology ◽  
Capability Improvement

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.

The Research of a Variable-Focus Ultrasonic Liquid Lens

2014 ◽  
Vol 598 ◽  
pp. 371-374
Author(s):  
Yu Wang ◽  
Wei Wang ◽  
Xu Zhou ◽  
Fu Long Zhai
Keyword(s):  
Response Time ◽  
Focal Length ◽  
Influence Factors ◽  
Ultrasonic Field ◽  
External Control ◽  
Control Voltage ◽  
External Voltage ◽  
Liquid Lens ◽  
Variable Focus ◽  
The Relationship

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.

scholarly journals Lorentz Force Actuated Tunable-Focus Liquid Lens

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 714
Author(s):  
Kari L. Van Grinsven ◽  
Alireza Ousati Ashtiani ◽  
Hongrui Jiang
Keyword(s):  
Lorentz Force ◽  
Large Range ◽  
Focal Length ◽  
Optical Systems ◽  
Wavefront Sensor ◽  
Physical Movement ◽  
Liquid Lenses ◽  
Liquid Lens ◽  
Magnetically Actuated

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.

Design and Analysis of Novel Four-Quadrant Double Liquid Lens Based on EWOD

2011 ◽  
Vol 403-408 ◽  
pp. 4388-4397
Author(s):  
Xiao Hu ◽  
Jiu Li ◽  
Jin Feng Liu ◽  
Zi Qiang Huang
Keyword(s):  
Electric Field ◽  
Applied Voltage ◽  
Optical Axis ◽  
Focal Point ◽  
Focal Length ◽  
Electrowetting On Dielectric ◽  
Voltage Difference ◽  
Liquid Lens ◽  
Four Quadrant ◽  
The Relationship

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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