WO2010034146A1

WO2010034146A1 - Electro-wetting diffractive-refractive liquid variable-focus lens

Info

Publication number: WO2010034146A1
Application number: PCT/CN2008/002129
Authority: WO
Inventors: 张薇; 田维坚
Original assignee: 中国科学院西安光学精密机械研究所
Priority date: 2008-09-26
Filing date: 2008-12-30
Publication date: 2010-04-01
Also published as: CN101685170B; CN101685170A

Abstract

An electro-wetting hybrid refractive-diffractive zoom lens is disclosed, which includes a substrate frame, and the rims of a first substrate and a second substrate are connected with the substrate frame (228) to form a sealed container. The sealed container is filled with electrolyte and insulating liquid that do not mix with each other. A first cylindrical electrode and a second cylindrical electrode are formed on the internal wall of the substrate frame. The surface of the second electrode and the internal surface of the substrate frame are covered by hydrophobic insulating layer. The first electrode is totally immersed in the electrolyte. One of the first and the second substrate is diffraction substrate, and the other is the flat substrate, or both of the substrates are diffraction substrates.

Description

Electrowetting type folding and mixing liquid zoom

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a liquid variable-definition fiber, which is superior to an electrowetting type of diffractive hybrid zoom liquid lens.

Background technique

Liquid zoom is a new type of optical component based on the principle of bionics in the world. It mainly has a zoomable fiber that utilizes the change of the electrowetting flow, and a zoomable pass based on the curvature change of the surface of the filled liquid. Wide tunable range, strong zoom capability, smooth zoom, easy processing, etc., with good prospects.

Ordinary liquid pass, whether it is the use of the electrowetting flow to change the angle of the variable angle of the boat, the variable curvature of the surface of the filling liquid, according to the aberration equation, the required power once determined, the surface curvature or The curvature of the interface between the two mutually incompatible solutions is determined. Therefore, in the case where the required power is determined, a liquid liquid love itself does not have the degree of freedom to correct the aberration, which makes it impossible to clearly image during the imaging process. When liquid love is applied to the design of the zoom system, since the liquid grinding itself cannot correct the aberration, if the system is required to be clearly imaged, ^ m , the number of lenses increases, which is not conducive to the miniaturization and dexterity of the zoom system.

Referring to Fig. 1, a conventional electrowetting type liquid 3⁄4 is mainly composed of a first base plate 121, a first: a bottom glass plate 122, a first metal electrode 123, a second electrode 124, a hydrophobic insulating layer 125, and electrolysis. The night body 126 and the insulating liquid 127 are formed. When a suitable voltage is applied between the metal electrode 123 and the second metal electrode 124, the two mutually incompatible liquid electrolyte liquids 126 and the annihilation of the night body 127 and the 绝缘7j insulating layer 125 are worms. The angle changes such that the curvature of the interface between the electrolyte liquid 126 and the insulating liquid 127 changes, and the focal length/winning change of the electrowetting liquid fiber is obtained. Corresponding to a certain refractive power Φ, since the two outer surfaces of the electrowetting liquid are first planar, the first base plate 121 and the third bottom plate 122 are flat, the interface between the electrolyte liquid 126 and the insulating liquid 127 The radius of curvature R must be determined in order to achieve the required power of Φ, so there is no degree of freedom in optimizing the image quality in the optical design.

In recent years, the research on i-money components has focused on the imaging structure of the boat in terms of the structure and stability. The improvement and improvement of the quality of the pre-mirror imaging has not been reported.

At present, the design and research techniques of slimming lenses such as Varioptic, Philip, Samsung, and Langshijiang Co., Ltd. are relatively fast, mainly including electrowetting liquids » electrical type, structure, filling liquid, etc. Type liquid job. However, as a single varifocal element, technical studies on how to correct the aberration of the liquid fiber, improve the quality of the fiber image, and obtain the image quality of the surface with the minimum weight and the side are not reported so far. In recent years, Shanghai SI University and Tsinghua University have also carried out research on liquid fiber, but most of them have studied the production process of slim fiber, and there is no report on improving the quality of single liquid fiber imaging.

Summary of the invention

The object of the present invention is to provide an electrowetting type of diffractive mixed zoom liquid «, which solves the background art

Confirmation Intraoperative ordinary liquid «There is no design freedom, and it is impossible to optimize the technical problem on a single piece of liquid.

The design of the present invention is as follows -

An electrowetting type of diffractive hybrid zoom liquid fiber, including a ship frame 228, further comprising a first 222 221 that is sealingly connected to the face frame 228, a fiber 繊 frame 228 and a first substrate 222 The sealed chamber 229 is filled with an incompatible electric angle «226 edge liquid 227, a first inner body 223 of the pm rn 228, and a second electrode 224, the surface of the second electrode 224 and The inner surface of the fiber optic frame 228 is completely covered with the enamel edge layer 225, and the first electrode 223 is completely immersed in the electric profit 226; the special feature is: one of the first 繊222 and the third of the leg: The diffractive surface is the other, and the other is a flat curtain.

The base of the diffractive surface of the above-mentioned leg scoop is a plastic material cage.

An electrowetting type of diffractive hybrid zoom liquid fiber, comprising a crucible frame 228, further comprising a first ship 222 m ^ 221 sealingly connected to the crucible frame 228, the truss 228 of the household M and the first substrate 222 are: 3⁄4 The sealing chamber 229 formed by the reverse 221 is filled with the mutually incompatible electric angle 226 and the insulating liquid 227, and the inner side of the housing frame 228 has a ring-shaped first electrode 223 for the two electrodes 224, and the second electrode The surface of the 224 and the inner surface of the fiber optic frame 228 are all covered with a layer 225, and the first electrode 223 of the chamber is completely immersed in the electrolyte 226; the special feature is: the first fiber 222 of the leg and the first « 221 All are diffractive surface fibers.

The above-mentioned leg scoop diffractive surface fiber base is a plastic material such as a plastic material.

The invention has the following advantages:

1. Increased the design freedom of liquid fiber, so that the single-liquid job can achieve rehabilitation and spherical aberration.

2. According to the invention, the flat base of the liquid is a diffractive optical surface, and the design freedom of the liquid fiber is abbreviated under the cake which does not increase the weight and side of the liquid, and does not affect the liquid fiber structure and stability, according to different Imaging and zooming requirements, different diffractive surface parameters can be rationally designed, and the imaging quality of a single liquid fiber can be improved according to the need to optimize the design of the telescope.

3. The cage optical component of the invention is formed on the liquid substrate, so that the liquid fiber can be applied to the design of the micro-type and dexterous zoom system, and has the characteristics of good image quality, small size, light weight, simple manufacture and easy control.

4. With the present invention, the optical system has a smaller lazy and weight, making it possible to achieve a perfect zooming system for a single boat with one or two fold-mixing liquid lenses.

5. It can be extended more widely to various systems that have high requirements for image quality, and the system size of the XX inch system is severely circulated to ensure miniaturization of the system.

DRAWINGS

FIG. 1 is a schematic structural view of a conventional ordinary electrowetting type liquid love.

2 is a schematic view showing the structure of a system for folding and mixing electrowetting liquid fibers according to the present invention.

FIG. 3 is a schematic diagram of a modulation transfer function (MTF) curve of a conventional ordinary electrowetting type liquid invited to a short focal length. Figure 4. The modulation transfer function (MTF) of the divergent hybrid electrowetting liquid lens of the present invention at a short focal length is intended.

5 is a modulation transfer function (MTF) curve of a conventional ordinary electrowetting liquid lens at a long focal length. FIG. 6 is a modulation transfer function (MTF) of a divergent hybrid electrowetting liquid lens of the present invention at a long focal length. BRIEF DESCRIPTION OF THE DRAWINGS: 121-first base glass plate, 122-second base plate, 123-first metal electrode, 124-second metal electrode, 125" 7K insulating layer, 126-electrolyte liquid, 127 - Insulating liquid; 221- 13⁄4, 222-first, 223-first electrode, 224-second electrode, 225- rim layer, 226- electric profit, 227 - insulating liquid, 228~3⁄4 truss, 229 - Seal the chamber.

Specific bribery

The invention is to design a common planar substrate in a common liquid as a diffractive optical element, that is, a diffractive surface «, which may be the first base glass plate 121 ^ 3⁄4 bottom glass in the conventional common electrowetting liquid « One of the plates 122, or the first base plate plate 121 and the first: the bottom plate 122. The present invention is »¾ diffraction optical element added to the diffractive optical surface, i.e., the phase function I bow into two yuan _{surface: ^) = ~ (Α χ} γ 2 + A 2 y 4 + ...)

The binary phase function of the bow I input, so that the liquid 邈的翁和和和和和和和和和 j j j j j j j j : : :

S' [( ₊ _ϋ± ₊ 4(» _{1 +} l) _{q +} 3 _1± 2 _ς 2 _]

4 n _x -1 n _x {η _λ ― 1) η (η _χ ― 1) η _χ η ₂ -1 η ₂ (η ₂ ― 1) η ₂ {η ₂ - 1) η ₂

+ ₃ ³ [(\+ € ₃ ² ) - 32ηιΑΑ ₂ ]}

2 «, (n, - 1) η _γ 2 η ₂ (η ₂ -1) η ₂

«! η ₂

Among them, the five aberrations and numbers of -S _V 3⁄4M reflect the spherical aberration, coma, astigmatism, curvature of field and distortion. φ ,, respectively, along an incident) a blind two liquids assumed optical power "is the optical power of the diffractive optical surface undertaken; is« ¾ intersection of the light rays from the optical axis; _"2 respectively along The refractive index of the incident two cis liquids; Η is the Lagrangian non-wing; GG is the total number of the microscopic and diffractive surfaces formed by the two liquids incident, and the love is formed by the light of each liquid. Incident and exit The aperture angle is determined; m is the corresponding diffraction order. Unless otherwise specified, usually ml; λ is the corresponding wavelength; it is the fourth-order coefficient in the binary surface phase function, that is, the fourth-order aspheric coefficient.

After the design of the diffractive optical surface is added to the liquid «system, a fourth-order aspheric coefficient A ₂ appears in the astigmatism and number. This aspherical coefficient gives the liquid system a degree of design freedom, enabling a single liquid fiber to be fiber-like. The fourth-order aspherical coefficient can be used for the spherical aberration of the liquid job and the achromatic aberration of the electrowetting liquid lens can also be achieved due to the negative dispersion characteristics of the diffractive surface.

The sleek optical element of the present invention is suitable for the electrowetting liquid, that is, the cage optical surface is a main structural fiber part of the liquid fiber, and the i» method can be liquid under the liquid state, size and stability cake. The hall has a total degree of freedom in the design of the image difference IE, so that the image quality can be optimized according to the needs of the night body to improve the quality of liquid fiber imaging. The present invention makes it possible to realize a fully imaged zoom system in a single piece or in two pieces of a mixed liquid. According to different requirements, different diffraction surface parameters can be reasonably designed.

FIG. 2 is a schematic view showing the structure of a system for deleting and mixing electrowetting liquid fibers according to the present invention. The first substrate 222 is sealed to the frame 228 by a periphery of 3⁄4^:1«221, and a sealed chamber 229 is formed. The sealed chamber 229 is filled with a mutually incompatible electrolyte 226 and an insulating liquid 227. The inside of the frame 228 is provided with a ring-shaped first electrode 223, two electrodes 224, and the first electrode 223 and the second electrode 224 are generally metal electrodes. The surface of the second electrode 224 and the inner surface of the frame 228 are all covered with a enamel edge layer 225. The first electrode 223 is completely submerged in the electrical night 226. The invention can be one of Wei Yi 222 and the third one of the 3⁄43⁄4221 as a diffractive surface cage, and the other is a planar fiber. It is also possible that both the fibers 222 and the third portions are diffractive surface fibers. The diffractive surface fiber is a diffractive optical element, and a glass material, such as an optical plastic, can be specifically used.

The addition of the facet of the present invention enables the elimination of spherical aberration and apochromatism in the middle of a single electrowetting type of divergent mixed liquid to obtain a more perfect image of the folded and mixed electrowetting liquid fiber.

The comparison of the focal length variation of the folded-mixed liquid fiber of the present invention with the medium-modulation transfer function (MTF) of the ordinary liquid fiber focal length is shown in Figures 3, 4, 5, and 6. It can be seen that after the addition of the diffractive surface, the modulation transfer function (TF) of the system at different focal lengths is significantly improved, and the imaging quality is optimized.

Claims

Claim

An electrowetting type of diffractive hybrid zoom liquid fiber comprising a truss (228), further comprising a first crucible (222) and a second (221) peripherally bonded to the substrate frame (228), the ship The curtain frame (228) and the first weir (222) are sealed with an electrically incompatible electrical angle (226) and an insulating liquid (227) in a sealed cavity (229) composed of ^ (221). The inner body of (228) has a ring-shaped first electrode (223) and a second electrode (224), and the surface of the second electrode (224) and the inner surface of the anti-frame (228) are covered with a rim layer (225). The first electrode (223) of the household is completely immersed in the electrolyte (226); characterized in that: the first fiber (222) and the first: = 3⁄4 and (221) are diffractive surface defects, The other is a plane 繊.

2. The electrowetting type of divisible mixed zoom liquid fiber according to claim 1 is characterized in that: the hard surface of the diffractive surface of the fiber is a plastic material.

3. An electrowetting type of divisible hybrid zoom liquid fiber, comprising a ship frame (228), further comprising a first reverse (222) 3⁄4B » anti (221), 繊 of the periphery of the substrate frame (228) The sealing chamber (229) formed by the truss (228) and the first fiber (222) with 3⁄4^^3⁄4 reverse (221) is filled with mutually incompatible electrical angles « (226) and insulating liquid (227), The inner side of the M-fiber anti-frame (228) has a ring-shaped first electrode (223) and a second electrode (224), and the surface of the second electrode (224) and the inner surface of the reflex frame (228) are covered with germanium. The water insulating layer (225), the first electrode (223) of the crucible is completely submerged in the auxiliary (226); and the first cage (222) = ^ (221) is a diffractive surface.

4. According to claim 3, the electrophoresis type of the dip-mixing and zooming liquid liquid of the leg spoon is as follows: The diffractive surface of the diffractive surface is the plastic material of the surface.