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

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

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.

To Understand Myopic Alleviation by Conducting Finite Element Structural Analysis of a Cornea With an Intrastromal Corneal Ring Implant

2015 ◽  
Author(s):  
Salman N. Khan ◽  
Panos S. Shiakolas
Keyword(s):  
Finite Element ◽  
Focal Length ◽  
Optical Power ◽  
The United States ◽  
Valuable Insight ◽  
Fe Model ◽  
Computationally Efficient ◽  
Intrastromal Corneal Ring ◽  
Light Rays ◽  
Insight Into

Myopia or shortsightedness is a visual impairment condition that is affecting more than 32 million Americans according to the American Academy of Ophthalmology, and this number is expected to increase even further with the increasing life expectancy in the United States. Myopia occurs when light rays entering the cornea are focused in front of the retina due to: high corneal curvature, short axial length of the eye, or high optical power of the natural lens. These reasons suggest that light refracting elements play a pivotal role in determining visual acuity. The cornea is the principal refractive element in the eye contributing almost 75 percent of ocular refractive power and if the shape of the cornea can be changed to increase or decrease the focal length of the converging light rays it could present a possible solution to improving myopia. The presented research focuses on the effects of intrastromal corneal ring (ICR) implantation on the shape of the cornea by developing a computationally efficient 3D axisymmetric finite element (FE) model of the cornea utilizing hyperelastic material properties. The results of the developed corneal FE model with a 360° ICR implant are analyzed and discussed. The FE model results provide confidence in the ability of the ICR implants to reduce myopia. The attained FE model results not only agree qualitatively with published clinical data but also provide a valuable insight into the surgery.

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.

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