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Publication numberCN101915989 A
Publication typeApplication
Application numberCN 201010239213
Publication date15 Dec 2010
Filing date28 Jul 2010
Priority date28 Jul 2010
Also published asCN101915989B
Publication number201010239213.1, CN 101915989 A, CN 101915989A, CN 201010239213, CN-A-101915989, CN101915989 A, CN101915989A, CN201010239213, CN201010239213.1
Inventors夏军, 姚晓寅
Applicant东南大学
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Electric field force-controlled liquid lens
CN 101915989 A
Abstract
The invention discloses an electric field force-controlled liquid lens. In the liquid lens, a barrier wall (3) is manufactured on a second transparent substrate (4), a second electrode (8) is covered on the barrier wall (3), a first liquid (5) is injected into the second electrode (8), a second liquid (2) is covered on the first liquid (5), a first electrode (7) is covered on a first transparent substrate (1), and the first electrode (7) is covered on the second liquid (2). The liquid lens structure does not need insulation layers, can not cause electrochemical reactions and has the advantages of fixed lens axis, low drive voltage and simple structure.
Claims(4)  translated from Chinese
  1. 一种电场力控制的液体透镜,包括第一透明基板(1)、第二透明基板(4)、第一电极(7)、第二电极(8)、第一液体(5)以及第二液体(6),其特征是:在所述的第二透明基板(4)上制作有障壁(3),在所述的障壁(3)上覆盖所述的第二电极(8),在第二电极(8)之间灌注所述的第一液体(5),所述的第二液体(2)覆盖在所述的第一液体(5)上,在所述的第一透明基板(1)上覆盖所述的第一电极(7),该第一电极(7)位于所述的第二液体(2)上。 A liquid lens control of electric force, comprising a first transparent substrate (1), a second transparent substrate (4), a first electrode (7), a second electrode (8), a first liquid (5) and a second liquid (6), characterized in that: on said second transparent substrate (4) to fabricate an barrier (3), the said barrier (3) covering the second electrode (8) on the second perfusion between said electrode (8) a first liquid (5), said second liquid (2) covering said first liquid (5), in said first transparent substrate (1) covering the first electrode (7), wherein the first electrode (7) located on said second liquid (2).
  2. 2.根据权利要求1所述的一种电场力控制的液体透镜,其特征是:第二电极(8)上覆盖疏水层。 2. The system of claim electric force control of the liquid lens 1, characterized in that: the second electrode (8) covers the hydrophobic layer.
  3. 3.根据权利要求1所述的一种电场力控制的液体透镜,其特征是:在第一电极(7)上增加薄膜晶体管阵列。 3. The electric force according to claim 1, wherein the control of the liquid lens, characterized in that: an increase in the thin film transistor array on the first electrode (7).
  4. 4.根据权利要求1所述的一种电场力控制的液体透镜,其特征是:液体透镜单元为旋转对称结构,排列方式可以是行列矩阵式排列、或品字状排列、或蜂窝状排列。 4. An electric field force control of the liquid lens according to claim 1, characterized in that: the liquid lens unit is a rotationally symmetric structure, the arrangement can be arranged in a matrix row, arranged or shaped article, or honeycomb arrangement. 2 2
Description  translated from Chinese

一种电场力控制的液体透镜 An electric force liquid lens control

技术领域 FIELD

[0001] 本发明涉及一种液体透镜结构,尤其是涉及一种在电压控制下能有效改变液体形状从而改变焦距的介电泳液体透镜结构。 [0001] The present invention relates to a liquid lens structure, in particular, relates to a voltage control can effectively change the shape of the liquid thereby changing dielectrophoretic focal length of the liquid lens structure.

背景技术 BACKGROUND

[0002] 液体透镜是由液体制成,模仿人眼晶状体的聚焦原理,通过控制液体发生形状变化从而引起折射率变化来实现聚焦和变焦。 [0002] The liquid lens is formed by the liquid, imitation focusing principle of human crystalline lens, thereby causing a refractive index change by controlling the change in shape of the liquid occurs to effect focusing and zooming. 与传统的透镜相比,液体透镜具有体积小、无需外部机械装置、反应速度快、无磨损、寿命长、成本低等特点。 Compared with traditional lenses, liquid lens with a small, without external mechanical device, fast response, no wear, long life, low cost. 液体透镜能在电压下可控地动态调节焦距,具有传统透镜不可比拟的优点。 Liquid lens can be controlled dynamically adjust the focus at a voltage, has incomparable advantages of traditional lenses. 液体透镜已经开始逐渐走入市场,应用于手机,相机,内窥镜等数码摄影、医疗、工业、通信领域。 Liquid lens has begun into the market, used in mobile phones, cameras, endoscopes and other digital photography, medical, industrial, communications. 液体透镜主要有以下几种工作原理:1、 通过机械力改变透镜外形和体积;2、通过加电改变液晶分子排列;3、基于电润湿或介电泳的原理使液体发生形变。 Liquid lenses are the following works: 1, change the shape and size of the lens by a mechanical force; 2, powered by changing the liquid crystal molecules are arranged; 3, based on the principle of electrowetting or liquid dielectrophoresis deformation occurs.

[0003] 电润湿现象可以用Young-Lippmann方程来描述: [0003] electrowetting phenomenon can be used to describe the Young-Lippmann equation:

[0004] cos θ = cos θγ + U2 [0004] cos θ = cos θγ + U2

2ασ/ν 2ασ / ν

[0005] 其中,θ为施加电压之后的液固接触角,θ γ为无电压时的初始液固接触角,%为真空介电常数,为介质层的相对介电常数,d为介质层的厚度,Qlv为液体和空气接触的表面张力,U为施加的电压。 [0005] where, θ is the applied voltage after the solid liquid contact angle, θ γ when no voltage is the initial liquid-solid contact angle,% vacuum permittivity, the relative permittivity of the dielectric layer, d is the dielectric layer thickness, the surface tension of liquid and air Qlv contact, U is the applied voltage. 1995年Gorman等人第一次实现了基于电润湿原理的液体透镜。 1995 Gorman, who first realized the liquid lens based on electrowetting principle. 他们将液滴置于透明电极上,通过施加电压使液滴发生了形变[1]。 They will be placed on the transparent electrode droplets, liquid droplets by applying a voltage deformation occurs [1]. 2000年,Berge和Peseux在先前Gorman等人实验的基础上,在电极上覆盖了介质层。年 2000, Berge and Peseux Gorman and others on the basis of previous experiments, the electrode covering the dielectric layer. 他们的问题在于如何将液滴中心固定在光轴上[2]。 Their problem is how the droplet center is fixed on the optical axis [2]. 2004年Philips公司提出了流体聚焦技术,将导电水溶液和油灌注到圆柱体容器中,在底面和侧壁上施加电压,在液体表面发生形变的同时,确保形变液面固定在圆柱体轴线上[3]。 2004 made by Philips fluid focus technique, the conductive solution and the oil was poured into a cylindrical container, a voltage is applied on the bottom and side walls, while the liquid surface is deformed, the deformation of the liquid level to ensure that the axis of the cylinder is fixed to [ 3]. 随后,Varioptic公司将导电溶液和油封装在圆锥形容器中,使液体透镜在光轴稳定性上有了很大的提高[4]。 Subsequently, Varioptic conductive solution and the oil companies will packaged in a conical container, the liquid lens has been greatly improved stability on the optical axis [4]. 但电润湿液体透镜多选用导电性溶液作为其中一种液体,实验表明易发生电化学反应,若要克服电化学反映则需在电极上覆盖绝缘层,为实现较低的工作电压,通常需要很薄的绝缘层,这在工艺制备上具有一定难度。 However, multi-use electrowetting liquid lens wherein the conductive solution is used as a liquid, experiments show prone to electrochemical reactions, the electrochemical reflect the need to overcome the insulating cover layer on the electrode, to achieve lower operating voltage, usually required a thin insulating layer, which has a certain degree of difficulty in the process for the preparation.

[0006] 介电泳控制不导电液体也能运用到液体透镜当中。 [0006] dielectrophoresis control non-conductive liquids which can be applied to the liquid lens. Chih-Cheng Cheng和J. Andrew Yeh在上下基板为ITO玻璃的容器中灌入一种低介电常数液滴和同密度的高介电常数的液体,利用DEP原理,在电压0-200V范围内焦距从34mm变化到12mm,上升和下降时间分别为650ms和300ms[5] [6]。 Chih-Cheng Cheng and J. Andrew Yeh poured into droplets of a low dielectric constant and a high dielectric constant with the density of the liquid in the upper and lower substrates of ITO glass container, utilizing the principles of DEP, in the range of the voltage 0-200V changes in focal length from 34mm to 12mm, the rise and fall times are 650ms and 300ms [5] [6]. 但此结构下的透镜,液滴会在平板上移动,不能控制透镜的位置。 However, this structure under the lens moving droplets on the plate, the position can not control the lens. Hongwen Ren和Shin-Tson Wu利用DEP力使液滴形成透镜阵列的同时改变焦距[7]。 Hongwen Ren and Shin-Tson Wu droplet formation utilizing DEP force while changing a focal length of the lens array [7]. 这样利用电场控制液滴分开并形成透镜,不能控制每个液滴的大小,不利于实现工业生产的标准化。 Thus the use of an electric field to control the droplet and forming a lens, you can not control the size of each droplet is not conducive to achieving standardization of industrial production. Su Xu, Yeong-Jyh Lin和Shin-Tson Wu提出了碗型电极DEP微透镜阵列的制备[8], 但碗型电极制备困难,很容易因为各种原因导致电场分布不均勻,而使液体运动不能形成透镜效果。 Su Xu, Yeong-Jyh Lin and Shin-Tson Wu proposed preparation bowl-shaped electrode DEP microlens array [8], but difficult to prepare a bowl-type electrode, it is easy because all causes uneven distribution of the electric field, motion of the liquid leaving the can not form a lens effect.

[0007] 为了克服现有液体透镜的不足,本发明提供一种介电泳液体透镜结构,采用两种不导电液体,避免了电化学反应,免去了介质层的制备。 [0007] In order to overcome the shortcomings of conventional liquid lens, the present invention provides a dielectrophoretic liquid lens structure using two non-conductive liquids, avoiding the electrochemical reaction, eliminating the need for the preparation of the dielectric layer. 壁电极的加入使电场的场强分布集中在障壁周围,液体界面处恰好能获得较高的场强,从而能在较低的电压使液体运动。 Wall of the electrode to the added field intensity distribution of the electric field concentrated around the barrier, the liquid at the interface just to obtain a higher field strength, which can make the motion of the liquid at a lower voltage. 壁电极还能控制液体位置不发生移动,并且液体界面离开壁电极后不再向中间运动。 Liquid electrode can control the position of the wall does not move, and after leaving the liquid interface to the middle of the wall of the electrode is no longer sport. 本发明使用的两种不导电且不相混容的液体,其表面自由能和介电常数与现有介电泳液体透镜相比也有所不同,使透镜的控制电压,透镜效果有一定区别。 The present invention is used in both non-conductive and not mixed liquid content, the surface free energy and also different dielectric constant compared to conventional dielectrophoresis liquid lens, the lens control voltage, there is a certain difference between the lens effect.

[0008] 参考文献: [0008] References:

[0009] [1]Christopher B. Gorman, Hans A. Biebuyck, George Μ. ffhitesides. Control of the Shape of Liquid Lenses on a Modified Gold Surface Using an Applied Electrical Potential across a Self-Assembled Monolayer. Langmuir,1995,11 (6), 2242-2246. [0009] [1] Christopher B. Gorman, Hans A. Biebuyck, George Μ. Ffhitesides. Control of the Shape of Liquid Lenses on a Modified Gold Surface Using an Applied Electrical Potential across a Self-Assembled Monolayer. Langmuir, 1995,11 (6), 2242-2246.

[0010] [2]B.Berge and J. Peseux. Variable focal lens controlled by an external voltage :An application of electrowetting. Eur. Phys. J. E,2000,3,159-163. . [0010] [2] B.Berge and J. Peseux Variable focal lens controlled by an external voltage:... An application of electrowetting Eur Phys J. E, 2000,3,159-163.

[0011] [3]BHW Hendriks, S. Kuiper, MAJ Van Aa, CA Renders and TW Tukker. Electrowetting-Based Variable-Focus Lens for Miniature Systems. OPTICAL REVIEW, 2005,12(3) ,255-259. [0011] [3] BHW Hendriks, S. Kuiper, MAJ Van Aa, CA Renders and TW Tukker. Electrowetting-Based Variable-Focus Lens for Miniature Systems. OPTICAL REVIEW, 2005,12 (3), 255-259.

[0012] [4] Lisa Saurei, Jerome Peseux, Frederic Laune and Bruno Berge. Tunable liquid lens based on electrowetting technology :principle, properties and applications.l_3Sept 2004, presented at the 10th Annual Micro-optics Conference, Jena, Germany. [0012] [4] Lisa Saurei, Jerome Peseux, Frederic Laune and Bruno Berge Tunable liquid lens based on electrowetting technology:. Principle, properties and applications.l_3Sept 2004, presented at the 10th Annual Micro-optics Conference, Jena, Germany.

[0013] [5]Chih-Cheng Cheng, C. Alex Chang and J. Andrew Yeh. Variable focus dielectric liquid droplet lens.OPTICS EXPRESS,2006,14(9),4101-4106. [0013] [5] Chih-Cheng Cheng, C. Alex Chang and J. Andrew Yeh. Variable focus dielectric liquid droplet lens.OPTICS EXPRESS, 2006,14 (9), 4101-4106.

[0014] [6]Chih-Cheng Cheng and J. Andrew Yeh. Dielectrically actuated liquid lens. OPTICSEXPRESS,2007,15(12),7140-7145. [0014] [6] Chih-Cheng Cheng and J. Andrew Yeh. Dielectrically actuated liquid lens. OPTICSEXPRESS, 2007,15 (12), 7140-7145.

[0015] [7]Hongwen Ren and Shin-Tson ffu. Tunable-focus liquid microlens array using dielectrophoretic effect. OPTICS EXPRESS,2008,16(4),2646-2652. [0015] [7] Hongwen Ren and Shin-Tson ffu. Tunable-focus liquid microlens array using dielectrophoretic effect. OPTICS EXPRESS, 2008,16 (4), 2646-2652.

[0016] [8]Su Xu, Yeong-Jyh Lin, and Shin-Tson ffu. Dielectric liquid microlens with well-shaped Electrode. OPTICS EXPRESS,2009,17(13),10499-10505. [0016] [8] Su Xu, Yeong-Jyh Lin, and Shin-Tson ffu. Dielectric liquid microlens with well-shaped Electrode. OPTICS EXPRESS, 2009,17 (13), 10499-10505.

发明内容 SUMMARY

[0017] 技术问题:为了克服电润湿液体透镜易击穿,介质层制备困难,及现有介电泳液体透镜结构难以固定液体位置等问题,本发明提供一种介电泳液体透镜结构,该结构不易击穿,无需介质层,能有效固定液体位置,实现动态控制焦距。 [0017] Technical Problem: In order to overcome the breakdown electrowetting liquid lens easy, difficult to prepare a dielectric layer, and the liquid existing dielectrophoresis difficult to fix the liquid lens structure location problem, the present invention provides a dielectrophoretic liquid lens structure, which easy breakdown, without the dielectric layer, the liquid can be effectively fixed position, dynamic focus control.

[0018] 技术方案:本发明解决其技术问题所采用的技术方案是:该结构由纵横排列的液体透镜单元组成,每个液体透镜单元的组成为:在第二透明基板上制作障壁,在障壁上覆盖第二电极,在第二电极之间灌注第一液体,第二液体覆盖在第一液体上,第一透明基板上覆盖第一电极,第一电极位于第二液体上。 [0018] Technical Solution: aspect of the present invention is used for solving the technical problems are: The structure consists of vertical and horizontal arrangement of the liquid lens unit composition, the composition of each of the liquid lens unit is: making the barriers on the second transparent substrate, the barrier covering the second electrode, the second electrode between the first perfusion liquid, the second liquid in the first liquid on the cover covering the first electrode on the first transparent substrate, a first electrode located on the second liquid.

[0019] 在本发明优选技术方案中,第二电极上覆盖有疏水层。 [0019] In a preferred aspect of the present invention, covered with a hydrophobic layer on the second electrode.

[0020] 在本发明优选技术方案中,在第一电极上增加薄膜晶体管阵列,每个液体透镜单元内第一液体和第二液体的交界面可以单独调整,即液体透镜单元的焦距可单独调整。 [0020] In a preferred aspect of the present invention, an increase on the first electrode thin film transistor array, each of the liquid lens unit within the first liquid and the second liquid interface can be adjusted individually, i.e., the focal length of the liquid lens unit can be adjusted individually .

4[0021] 在本发明优选技术方案中,液体透镜单元为旋转对称结构,排列方式可以是行列矩阵式排列、或品字状排列、或蜂窝状排列。 4 [0021] In a preferred aspect of the present invention, the liquid lens unit is rotationally symmetric structure, the arrangement can be arranged in a matrix row, arranged or shaped article, or honeycomb arrangement.

[0022] 有益效果:本发明的有益效果是,与传统电润湿透镜相比,第一液体和第二液体与第一电极和第二电极之间无需绝缘层,工作电压低,不易击穿,第一电极位于中间隔断上, 有利于固定透镜光轴位置,结构简单。 [0022] Advantageous Effects: beneficial effects of the present invention is compared with conventional without between the electrowetting lens, the first liquid and the second liquid with the first electrode and the second electrode insulating layer, low voltage, easy breakdown a first electrode located on the intermediate partition, is conducive to the location of a fixed lens optical axis, a simple structure.

附图说明 Brief Description

[0023] 图1是本发明优选实施例结构图; [0023] FIG. 1 is a configuration diagram of a preferred embodiment of the present invention;

[0024] 以上的图中有:1、第一透明基板,2、第二液体,3、障壁,4、第二透明基板,5、第一液体,6、第一液面,7、第一电极,8、第二电极。 [0024] The above figures are: 1, a first transparent substrate 2, the second liquid, 3, barrier ribs 4, a second transparent substrate 5, a first liquid, 6, the first level, 7, a first electrode 8, the second electrode.

具体实施方式 DETAILED DESCRIPTION

[0025] 图1所示为本发明优选实施例结构图,主要包括:第二透明基板4,可采用玻璃、透明树脂等材料,在第二透明基板4上制作障壁3,可以在第二透明基板4上直接印制金属网孔形成障壁3,障壁3可以直接作为第二电极8,例如银、铁、铜网孔等,或者利用SU-8等材料经紫外曝光形成此障壁3,再在障壁3上镀上导电膜形成第二电极8。 [0025] Figure 1 shows the structure view of a preferred embodiment of invention, including: a second transparent substrate 4, may be glass, transparent resin or the like, making the barrier 3 on the second transparent substrate 4, in the second transparent printed directly on the substrate 4 is formed of metal mesh barrier ribs 3, 3 can be used directly as the second barrier electrode 8, for example, silver, iron, copper mesh, etc., or the use of SU-8 and other materials formed by UV exposure this barrier 3, and then in barrier coating on the conductive film 8 is formed on the second electrode 3. 障壁3可以制成矩形、梯形等形状,也可以是没有尖角的圆弧形。 Barrier 3 may be made rectangular, a trapezoid, and may be no sharp corners rounded. 在障壁3之间灌注第一液体5,第一液体5选用介电常数小、表面自由能小的液体,例如二甲基硅氧烷、正己烷、异辛烷、十六烷、正癸醇等,第二液体2覆盖在第一液体5上,第二液体2选用介电常数大、表面自由能大的液体,例如丙三醇、乙二醇等,也可以第一液体5选用介电常数大、表面自由能大的液体,而第二液体2选用介电常数小、表面自由能小的液体。 3 perfusion between the first liquid barrier 5, selection of the first liquid 5 small dielectric constant, small liquid surface free energy, such as dimethyl siloxane, n-hexane, isooctane, hexadecane, n-decyl alcohol etc., the second liquid over the first liquid 2 5, selection of the second liquid two large dielectric constant, a large surface free energy of liquid, such as glycerol, ethylene glycol, etc., may be the first choice of the dielectric liquid 5 constant large, large liquid surface free energy, and the choice of the dielectric constant of the small second liquid 2, the liquid can be a small surface free. 第一透明基板1同第二透明基板4 一样,可采用玻璃、透明树脂等材料。 A first transparent substrate 1 with the second transparent substrate 4, as may be glass, transparent resin or the like. 第一透明基板1上需要镀上导电膜,形成第一电极7,也可以选用具有导电性的基板,例如ITO玻璃等。 On a first transparent substrate coated with a conductive film need to form a first electrode 7, and to be used with a conductive substrate, such as ITO glass and the like. 将第一电极7盖在第二液体2上,形成单透镜结构。 The first electrode 7 on the second liquid lid 2, forming a single lens structure. 在第二电极8上还可以覆盖疏水层,例如,聚四氟乙烯,cytop等材料,以减小液体界面运动的迟滞性。 On the second electrode 8 may also cover the hydrophobic layer, e.g., polytetrafluoroethylene, cytop other materials, to reduce the movement of the liquid interface hysteresis. 但是与电润湿器件不同,此处疏水层无需完整包覆第二电极8,当在第一电极7 和第二电极8之间施加电压时,第一液面6会发生移动,从而实现透镜动态调节焦距,例如第一电极7接地,第二电极8接正电压,第一电极7和第二电极8之间产生非均勻电场,第一液体5和第二液体2在非均勻电场下产生介电泳力,介电泳力作用介电常数大的液体,如第一液体5,向场强梯度大的地方流动,同时第一液面6发生形变,即在第二电极8的表面发生移动。 But with different electrowetting device, where the hydrophobic layer without complete coating of the second electrode 8, when voltage is applied between the first electrode 7 and the second electrode 8, the first liquid 6 moves occurred, in order to achieve the lens dynamically adjust the focus, for example, the first ground electrode 7, 8 second electrode connected to the positive voltage, resulting in non-uniform electric field between 7 and 8 of the first electrode and the second electrode, the first and second liquid liquid 5 2 production in the non-uniform electric field dielectrophoretic force, the dielectrophoretic force permittivity of liquid, as in the first liquid 5, the gradient field strength where large flow, while the first surface 6 is deformed, i.e. move occurs at the surface of the second electrode 8. 由于电场强度集中第二电极8周围,液体界面处恰好能获得较高的场强,从而在较低的电压下液体就能运动。 Since the electric field strength concentrated around the second electrode 8, the liquid at the interface just to obtain a higher field strength, so that a lower voltage can be liquid movement.

[0026] 图1中液体单透镜单元为旋转对称结构,液体透镜阵列排列方式可以是行列矩阵式排列、或品字状排列、或蜂窝状排列。 [0026] Figure 1 is a liquid single-lens unit rotationally symmetrical structure, the arrangement of the liquid lens array may be arranged in a matrix row, arranged or shaped article, or honeycomb arrangement. 另外,在第一电极7上增加薄膜晶体管阵列,每个液体透镜单元内第一液体和第二液体的交界面可以单独调整,即液体透镜单元的焦距可单独调整。 Further, on the first electrode 7 increases thin film transistor array, each of the liquid lens unit within the first liquid and the second liquid interface can be adjusted individually, i.e., the focal length of the liquid lens unit can be individually adjusted.

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Classifications
International ClassificationG02B26/02, G02B3/14
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