Large aperture tunable-focus liquid lens using shape memory alloy spring

Hasan, Nazmul; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.1364/oe.24.013334

Cited by 52 publications

(15 citation statements)

References 19 publications

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“…However, this problem seems solvable in the near future since an aperture of about 20 mm is already enough to achieve more reasonable fnumbers and there are research groups proposing designs for tuneable lenses with diameters of 30 mm and more (e.g. [12,13]). Since the intention behind our experimental setup is a demonstration of the general feasibility of our approach we did not focus on a systems optimization with respect to aberrations etc.…”

Section: Theoretical Considerations and Limitationsmentioning

confidence: 99%

Zoom systems with tuneable lenses and linear lens movements

Lenk

Mitschunas

Sinzinger

2019

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Classical zoom lenses are based on movements of sub-modules along the optical axis. Generally, a constant image plane position requires at least one nonlinear sub-module movement. This nonlinearity poses a challenge for the mechanical implementation. Tuneable lenses can change their focal length without moving along the optical axis. This offers the possibility of small system lengths. Since the focal range of tuneable lenses with significant aperture diameters is still limited, the use of tuneable optics in zoom lenses is usually restricted to miniaturized applications. Methods: To solve the challenge of the nonlinear movement in classical zoom lenses and the limitations of tuneable lenses for macroscopic applications we propose a combination of both concepts. The resulting 'Hybrid Zoom Lens' involves linear movements of sub modules as well as changing the focal length of a tuneable lens. The movements of the sub-modules and the focal length tuning of the lens are already determined by the collinear layout of the zoom lens. Therefore, we focus on collinear considerations and develop a method that allows a targeted choice of specific collinear layouts for our 'Hybrid zoom lenses'. Results: Based on examples and an experimental setup we demonstrate the feasibility of our approach. We apply the proposed method to examples of classical zoom lenses and zoom lenses based exclusively on tuneable lenses. Thereby we are able to show possible advantages of our 'Hybrid zoom lenses' over these widespread system types. Conclusions: We demonstrate important collinear considerations for the integration of tuneable lenses into a zoom lens. We show that the combination of classical zoom lens concepts with tuneable lenses offers the possibility to reach smaller system lengths for macroscopic zoom lenses while requiring only a small focal tuning range of the tuneable lens.

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Section: Theoretical Considerations and Limitationsmentioning

confidence: 99%

Zoom systems with tuneable lenses and linear lens movements

Lenk

Mitschunas

Sinzinger

2019

J. Eur. Opt. Soc.-Rapid Publ.

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“…The surface of the liquid is changed by the electric field, which changes the focus. Hasan et al [ 9 ] suggested an accommodating IOL that uses a shape memory alloy spring controlled by electric heat. Vdovin et al [ 10 ] suggested an accommodating IOL that uses a liquid crystal lens deformed by conductive metal that is moved by an electrical field.…”

Section: Introductionmentioning

confidence: 99%

Artificial accommodating intraocular lens powered by an ion polymer-metal composite actuator

et al. 2021

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The current method of controlling the focus of an accommodating intraocular lens is based on ciliary muscle contraction and cannot be used in older patients with presbyopia. We aimed to develop a dynamically accommodating intraocular lens powered by a membrane-shaped ion polymer metal composite actuator that is thin enough to be inserted in the eye. This study addresses two key problems identified in our previous accommodating intraocular lens prototype: the lack of repeatability due to the use of swine lenses instead of artificial lenses and the occurrence of a sixth order aberration. Thus, we present a new accommodating intraocular lens design and a method to transfer energy to actuators. To accommodate lens deformation and depth of focus, we used a membrane-shaped ion polymer metal composite actuator, thin enough to be inserted in the eye, and used an artificial silicone lens. To prevent the sixth order aberration, we included a ring between the ion polymer metal composite actuator and the lens. Different voltage patterns were applied to the IPMC actuator and changes in focus were observed. We were able to obtain repeatability and prevent the sixth order aberration. The dioptric power changed to ±0.23 D when ±1.5 V was used; however, at >1.5 V, a large accommodating range occurred, in addition to astigmatic vision. Thus, we have developed a novel prototype that is completely artificial, allowing reproducible and repeatable results. Visual accommodative demands were successfully met; however, although astigmatic vision was lessened, it was not completely eradicated.

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“…In addition, tunable focus liquid lenses with large optical aperture were also introduced, which provided larger range of tunable power [13][14][15][16]. In order to reduce gravity effects to the performance of liquid lens, one method used an inplane pretention force onto the membrane to take the place of surface tension and another used a nonuniform thickness profile of flexible membrane [17,18].…”

Section: Introductionmentioning

confidence: 99%

Progressive Multifocal Liquid Lenses Based on Asymmetric Freeform Surface Structure of Nonuniform Thickness Elastic Membranes with Different Constraints

Jia

Zhang

2019

International Journal of Optics

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For a progressive multifocal liquid lens with an elastic membrane deformed by liquid pressure, to realize a reasonably power distribution, asymmetric deformation characteristics of the membrane surface are needed. Based on the asymmetric freeform surface structure, this paper proposed progressive multifocal liquid lenses focused by liquid with nonuniform thickness membranes. The structure and mathematical model of power distribution for the lens are introduced. The membrane deformation and the corresponding power distribution of the lenses with asymmetric freeform surface are predicted and compared under uniform pressure load and different boundary conditions using the finite element method. An optical testing system is constructed to analyze the optical characteristics of the fabricated lenses through observing the focusing performance of the F target image at different regions of the lenses. Experimental results show that the liquid lenses can realize as asymmetrical progressive multifocal liquid lenses after liquid accommodation; meanwhile, the trends of power distribution of the lenses generally agree well with simulations.

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Large aperture tunable-focus liquid lens using shape memory alloy spring

Cited by 52 publications

References 19 publications

Zoom systems with tuneable lenses and linear lens movements

Zoom systems with tuneable lenses and linear lens movements

Artificial accommodating intraocular lens powered by an ion polymer-metal composite actuator

Progressive Multifocal Liquid Lenses Based on Asymmetric Freeform Surface Structure of Nonuniform Thickness Elastic Membranes with Different Constraints

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