CN206248862U - The bionical zoom microlens system of polymer gel eyeball - Google Patents

Abstract

The utility model discloses a polymer gel eyeball bionic zoom microlens system, which comprises a zoom microlens and an adjustable voltage source. The output voltage of the adjustable voltage source can control the change of the focal length of the zoom microlens. A zoom microlens consists of a polymer gel, a positive electrode, an insulator, and a negative electrode. The positive electrode, the insulator and the negative electrode are concentric ring structures with a certain thickness, which are distributed sequentially from the center to the outside, and the surfaces are even, and the same side of the three is pasted with a circular polymer gel. The positive and negative electrodes can be made of highly conductive sheets or films such as copper, silver, and graphene, and the insulator can be made of non-deformable insulating materials such as POM. The zoom microlens system of the utility model uses polymer gel with electrorheological behavior as the lens main body, realizes the zoom behavior in a self-driven manner, does not rely on fluid, is stable, convenient, low in energy consumption, low in cost, simple in structure, and thin in thickness , easy to realize miniaturization.

Description

Polymer gel eyeball biomimetic zoom microlens system

technical field

The invention belongs to the field of bionic manufacturing, and relates to the field of zoom microlenses, in particular to an eyeball bionic zoom microlens system based on polymer gel.

Background technique

Machine vision is used to replace human eyes for measurement and judgment. It has been widely used in optics, electronics, automobile manufacturing, semiconductor, military, aerospace and other industries, involving computers, artificial intelligence, opto-mechanical integration and other fields. Optical lens, as the core of machine vision, is developing towards intelligence, miniaturization, and flexibility. At present, its zooming method is mainly realized by mechanically moving the relative position of the multi-lens combination, but this method is complex in structure, bulky, and difficult to control. Difficulty, high cost, and low accuracy restrict its application.

Some experts and scholars at home and abroad have carried out research on the zoom system one after another, and have made some progress. Mainly in three aspects:

One is to achieve zooming by controlling the shape of one or two fluid interfaces. For example, in 2011, Dr. Federico Carpi of the University of Pisa proposed a bionic adaptive lens driven by a dielectric elastomer. It is modeled on the structure of the human eye, and the flexible electrode is energized to make the clamp Fluidic dielectric elastomer deforms to achieve focal length change (Carpi,F.; Frediani,G.; Turco,S.; De Rossi,D.,Bioinspired Tunable Lens with Muscle-Like ElectroactiveElastomers.Advanced Functional Materials 2011,21( 21), 4152-4158);

The second is to achieve zooming through local refractive index changes. For example, in 2000, L.G. Commander et al. proposed a zoom lens composed of liquid crystals through refractive index changes (Commander, L.G.; Day, S.E.; Selviah, D.R., Variable focal length microlenses. Optics Communications 2000, 177(1-6), 157-170). Both of the above two methods can achieve the advantages of large zoom range, fast response speed, and high resolution. However, because the fluid contained in the lens system is likely to cause fluid leakage, this will greatly reduce the service life of the lens. At the same time, the external drive module is too large. It takes up a lot of space and is not easy to be applied and promoted.

The third is to use the application of electroactive polymers to replace the use of the above fluids, but this method inevitably requires the use of transparent electrodes, such as poly(3,4-ethylenedioxythiophene), indium tin oxide, etc., which will limit the zoom In the application space of the lens, the prestress generated by clamping weakens the life of the electroactive polymer, and the imaging effect of the lens is restricted by the transparency of the transparent electrode (Son, S.I.; Pugal, D.; Hwang, T.; Choi , H.R.; Koo, J.C.; Lee, Y.; Kim, K.; Nam, J.D., Electromechanically driven variable-focus lens based on transparent dielectric elastomer. Appl Opt 2012, 51(15), 2987-96).

Contents of the invention

In view of the deficiencies of existing zoom lens systems, the purpose of the present invention is to propose an adaptive eyeball bionic zoom microlens system that does not rely on fluids and transparent electrodes, breaking through the application limitations of previous zoom systems, and realizing simple and flexible zoom microlenses , stability and miniaturization.

The technical solution of the present invention is to use the polymer gel with electrorheological behavior as the lens body and self-driven. The specific solution is as follows: a polymer gel eyeball bionic zoom microlens system, including a zoom microlens and an adjustable The voltage source and the zoom microlens are connected to the positive and negative poles of the adjustable voltage source through wires to form a closed loop, and the focal length of the zoom microlens can be controlled by changing the output voltage of the adjustable voltage source. A zoom microlens consists of a polymer gel, a positive electrode, an insulator, and a negative electrode. The positive electrode, the insulator, and the negative electrode are concentric ring structures with a certain thickness, distributed sequentially from the center to the outside, and the surfaces are even, and the same side of the three is pasted with a circular polymer gel. The positive electrode contains through-holes with a diameter of less than 10mm. The polymer gel can be transparent electrorheological gel such as PVC gel with plasticizer. The positive and negative electrodes can be made of highly conductive sheets or films such as copper, silver, and graphene, and the insulator can be made of non-deformable insulating materials such as POM.

The present invention is a polymer gel eyeball bionic zoom microlens system. When the positive pole and the negative pole of the zoom microlens are energized, the polymer gel at the through hole of the positive pole creeps and deforms in the hole to form a meniscus cross section (curvature of the upper and lower surfaces) set to R1 and R2 respectively). Due to creep deformation, the thickness h of the gel lens at the boundary of the through hole increases, so that R2>R1, according to the lens manufacturer's formula, thus forming a zoom concave lens. As the voltage increases, R2>>R1, the focal length will become very small. When the parallel light passes through the zoom microlens, the light diverges onto the opaque light screen. The existence of the insulator makes the polymer gel creep and deform in the through hole of the positive electrode, and avoids creeping to the side of the positive electrode, so that the creep deformation in the positive electrode hole can be maximized, so that the focal length change is the largest. The adjustable range of the voltage between the positive and negative electrodes can be determined according to the material of the polymer gel, so that the focal length can vary from ∞ to 0mm. Due to the small power, the energy consumption is low.

The invention relates to a polymer gel eyeball bionic zoom microlens system. The combined lens includes the zoom microlens, a convex lens, a clamping device and an adjustable voltage source. The zoom microlens and the convex lens are coaxially arranged with a distance of L, and are combined by a clamping device. The clamping device can be a fixed structure or a movable structure that allows the zoom microlens and the convex lens to move coaxially for a varying distance. By moving the distance L between the zoom microlens and the convex lens or controlling the focal length of the zoom microlens through an adjustable voltage source, the focal length of the combined lens can be changed on the basis of the inherent focal length of the convex lens.

The invention relates to a polymer gel eyeball bionic zoom microlens system. A focal length measuring device includes a parallel light source, a bracket, a zoom microlens, a translucent light screen, a CCD camera, a casing and a computer. The main body of the parallel light source, the bracket, and the translucent light screen are all cylindrical structures, coaxially distributed from left to right. The center of the holder contains a circular hole for mounting a zoom microlens. The semi-transparent light screen is made of a certain thickness of non-shading material, so that the CCD camera can record the change of the image on the right side. The shell is used to install parallel light sources, brackets, translucent light screens and CCD cameras, and provides power supply devices, distance adjustment devices and zoom micro-lens voltage adjustment devices to make each device work. The computer is connected to the CCD camera to obtain real-time data. The parallel light source irradiates the parallel light on the bracket installed with the zoom microlens, and the translucent light screen obtains the light spot image, and the CCD camera arranged on the right side records the change process of the light spot image on the translucent light screen. In the case of distance between components, CCD camera magnification, and power-on voltage, the focal length change can be displayed in real time through software. The focal length change process, response speed and focal length stability value of the zoom microlens under different voltages can be obtained through the focal length measuring device.

A polymer gel eyeball bionic zoom microlens system of the present invention has the advantages of: (1) The polymer gel with electrorheological behavior is used as the lens body to realize the zoom behavior in a self-driven manner, without relying on fluid, stable, Convenient, low energy consumption, and low cost; (2) The polymer gel is located on the same side of the positive and negative electrodes, which is convenient for disassembly and installation, and does not require the clamping of the transparent electrode, does not generate prestress and is not affected by the transparency of the transparent electrode, The structure is simple, the thickness is thin, and it is easy to realize miniaturization; (3) The use of insulators maximizes the deformation, and the focal length can be automatically adjusted in a large range from zero to infinity; (4) The system contains a focus measuring device, which can reflect real-time The focal length change process, and the response speed and focal length stability value of the zoom microlens under different voltages are obtained, so as to provide a reference for the use of the zoom microlens.

Description of drawings

Fig. 1 is a schematic diagram of a polymer gel eyeball bionic zoom microlens system of the present invention.

Fig. 2 is a schematic diagram of deformation principle of a polymer gel eyeball bionic zoom microlens system of the present invention.

Fig. 3 is a large deformation schematic diagram of a polymer gel eyeball bionic zoom microlens system of the present invention.

Fig. 4 is a schematic diagram of the imaging principle of a polymer gel eyeball bionic zoom microlens system of the present invention.

Fig. 5 is a schematic diagram of a combined lens system of a polymer gel eyeball bionic zoom microlens system according to the present invention.

Fig. 6 is a schematic diagram of a focal length measurement device of a polymer gel eyeball bionic zoom microlens system according to the present invention.

In the figure: 1-zoom microlens, 2-polymer gel lens, 3-positive pole, 4-insulator, 5-negative pole, 6-adjustable voltage source, 7-parallel light, 8-opaque light screen, 9-convex lens , 10-clamping device, 11-adjustable voltage source, 12-parallel light source, 13-support, 14-translucent light screen, 15-CCD camera, 16-housing, 17-computer.

detailed description

A polymer gel eyeball bionic zoom microlens system of the present invention, as shown in Figure 1, the system includes a zoom microlens 1 and an adjustable voltage source 6, the zoom microlens 1 passes through the positive and negative of the wire and the adjustable voltage source 6 Pole connections form a closed loop, and the focal length of the zoom microlens 1 can be controlled by changing the output voltage of the adjustable voltage source 6 . The zoom microlens 1 includes a polymer gel lens 2 , a positive electrode 3 , an insulator 4 and a negative electrode 5 . The positive electrode 3 , the insulator 4 and the negative electrode 5 are concentric circular ring structures with a certain thickness, which are distributed sequentially from the center to the outside, and the surfaces are even, and a circular polymer gel lens 2 is pasted on the same side of the three. The positive electrode 3 contains through holes with a diameter of less than 10 mm. The polymer gel lens 2 can be a transparent electrorheological gel such as PVC gel with a plasticizer. The positive electrode 3 and the negative electrode 5 can be made of highly conductive sheets or films such as copper, silver, and graphene, and the insulator 4 can be made of non-deformable insulating materials such as POM.

A polymer gel eyeball bionic zoom microlens system of the present invention, as shown in Figure 2, when the positive pole 3 and the negative pole 5 in the zoom microlens are energized, the polymer gel lens 2 at the through hole of the positive pole 3 creeps into the hole Deformed to form a meniscus cross-section (the curvature of the upper and lower surfaces is set to R1, R2, respectively). As shown in Figure 3, due to creep deformation, the thickness h of the gel lens at the boundary of the through hole increases, so that R2>R1, according to the lens manufacturer's formula, thus forming a zoom concave lens. As the voltage increases, R2>>R1, the focal length will become very small. As shown in FIG. 4 , when the parallel light 7 passes through the zoom microlens 1 , the light diverges onto the opaque light screen 8 . The existence of the insulator 4 enables the polymer gel lens 2 to creep and deform in the through hole of the positive electrode 3, and avoid creeping to the side of the positive electrode 3, so that the creep deformation in the hole of the positive electrode 3 can be maximized, so that the focal length change is the largest. The adjustable range of the voltage between the positive and negative electrodes can be determined according to the material of the polymer gel, so that the focal length can vary from ∞ to 0 mm. For example, a PVC gel, through the voltage range of 0 ~ 1kV, makes the focal length range from ∞ to 20mm. Due to the small power, the energy consumption is low.

A polymer gel eyeball bionic zoom microlens system of the present invention, as shown in FIG. The zoom microlens 1 and the convex lens 9 are coaxially arranged with a distance of L, and are combined by a clamping device 9. The clamping device 9 can be a fixed structure, or the zoom microlens 1 and the convex lens 9 can be coaxially moved for a variable distance active structure, such as screw nut structure. By moving the distance L between the zoom microlens 1 and the convex lens 9 or controlling the focal length of the zoom microlens 9 by adjusting the voltage of the voltage source 11, the focal length of the combined lens can be changed on the basis of the intrinsic focal length of the convex lens.

A polymer gel eyeball bionic zoom microlens system of the present invention, as shown in Figure 6, the focal length measuring device includes a parallel light source 12, a bracket 13, a zoom microlens 1, a translucent light screen 14, a CCD camera 15, and a housing 16 and computer 17. The main bodies of the parallel light source 12, the bracket 13, and the translucent light screen 14 are all cylindrical structures, coaxially distributed from left to right. The center of the bracket 13 contains a circular hole for installing the zoom microlens 1 . The translucent light screen 14 is made of a certain thickness of non-shading material, so that the CCD camera 15 can record the change of the image on the right side. The housing 16 is used to install the parallel light source 12, the bracket 13, the translucent light screen 14 and the CCD camera 15, and provide the power supply unit, the distance adjustment unit and the zoom microlens voltage adjustment unit for each device to work. Computer 17 is connected with CCD camera to obtain real-time data. The parallel light source 12 irradiates the parallel light on the bracket 13 on which the zoom microlens 1 is installed, and the translucent light screen 14 obtains the light spot image, and the CCD camera arranged on the right side records the change process of the light spot image on the translucent light screen, and the computer 17 The distance of each workpiece, the magnification of the CCD camera, and the power-on voltage are set in advance to display the change of the focal length in real time through the software. The focal length change process, response speed and focal length stability value of the zoom microlens 1 under different voltages can be obtained through the focal length measuring device.

Claims (7)

1. the bionical zoom microlens system of polymer gel eyeball, it is characterised in that：Including becoming focus microlens and variable voltage source, Become focus microlens and closed-loop path is connected and composed by the both positive and negative polarity of wire and variable voltage source, by changing the defeated of variable voltage source Going out voltage can control to become the focal length variations of focus microlens；Becoming focus microlens includes polymer gel, positive pole, insulator and bears Pole, positive pole, insulator and negative pole are certain thickness donut structure, are outwards sequentially distributed by center, and flush, three Person posts the same side circular polymer gel, and positive pole contains through hole.

2. the bionical zoom microlens system of polymer gel eyeball according to claim 1, it is characterised in that：Positive pole contains Through hole of the diameter less than 10mm.

3. the bionical zoom microlens system of polymer gel eyeball according to claim 1, it is characterised in that：Polymer coagulates Glue is that the transparent electric current such as the PVC gel with plasticizer becomes gel.

4. the bionical zoom microlens system of polymer gel eyeball according to claim 1, it is characterised in that：Positive pole and negative Pole can be made up of the conductive foil high such as copper, silver, Graphene or film.

5. the bionical zoom microlens system of polymer gel eyeball according to claim 1, it is characterised in that：Insulator can It is made up of the on-deformable insulating materials such as POM.

6. the bionical zoom microlens system of polymer gel eyeball according to claim 1, it is characterised in that：It is micro- in zoom Coaxially arranged convex lens at a certain distance from lens, and be combined together by clamping device and constitute compound lens.

7. the bionical zoom microlens system of polymer gel eyeball according to claim 6, it is characterised in that：Clamping device It is fixed structure, or allows change focus microlens and convex lens coaxially to move the bascule of change distance.