Compound eye mother lens composed of liquid sub-lens arrays with adjustable focal lengths and preparation method thereof

Abstract

The present invention relates to the field of micro-optical technology, and specifically relates to a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length and a preparation method thereof. The compound eye mother lens includes an outer skeleton, an inner skeleton, a transparent elastic film, and a liquid storage container; the outer skeleton and the inner skeleton are correspondingly arranged in an arc shape. The outer skeleton is provided with first through holes arranged in a central array along it, and the inner skeleton is provided with second through holes corresponding to the first through holes. The transparent elastic film is arranged between the inner skeleton and the outer skeleton to form a compound eye structure; the compound eye structure includes at least two. The liquid storage container is arranged between the compound eye structures, and the liquid storage container is provided with a liquid injection hole. By controlling the liquid in the liquid storage container through the liquid injection hole, a pressure difference is formed inside and outside the compound eye mother lens, driving the compound eye structure to deform. The transparent elastic film is divided into multiple sub-lenses, having the function of an "insect compound eye", forming a lens array, and further adjusting the focal length, and also solving the problem of relatively large spherical aberration.

Description

Technical Field

[0001] The present invention relates to the field of micro-optical technologies, and particularly to a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length and a preparation method thereof. Background Art

[0002] In micro-optical technologies, a microlens array is an important optical element, which shows broad application prospects in the fields of optical communication, optical imaging, optical storage, etc. As a cutting-edge two-dimensional integrated optical component, the microlens array is indispensable for promoting the progress of micro-optical elements, waveguide devices, and optical integrated systems. Its precise array structure brings revolutionary application potential to multiple fields such as optical communication, optical imaging, optical storage, optical display, and optical information processing. For example, efficient optical interconnection systems, complex image transformation and recognition technologies, and multifunctional optical passive device arrays created by microlens arrays have long attracted the close attention of the academic and industrial communities.

[0003] However, the focal length of the microlens array products widely used in the market today is fixed. Although it brings convenience in manufacturing and cost control, it also greatly limits the flexibility and scope of application of optical devices. Due to the lack of the ability to adjust the focal length, the fixed-focal-length microlens array cannot dynamically adjust the focal length or cannot be adjusted according to the application scenarios of different working environments, resulting in a decline in the overall performance of the microlens array and a limitation of potential application fields. For example, in occasions where it is necessary to adjust the focal length in real time to adapt to imaging of objects at different distances, the fixed-focal-length microlens array cannot meet the requirements, restricting its use in some high-end applications. Moreover, due to the fixed focal length, the microlens array has a low duty cycle and large spherical aberration, affecting the imaging quality. Summary of the Invention

[0004] In order to solve the technical problems that the focal length of the existing microlens array products cannot be dynamically adjusted, the scope of application is small, and the imaging quality is affected, the purpose of the present invention is to provide a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length, and the specific technical solutions adopted are as follows:

[0005] An outer framework, an inner framework, a transparent elastic film, and a liquid storage container;

[0006] The outer framework and the inner framework are correspondingly arranged and both are arc-shaped. The outer framework is provided with first through holes arranged in a central array along it, and the inner framework is provided with second through holes corresponding to the first through holes. The transparent elastic film is arranged between the inner framework and the outer framework to form a compound eye structure;

[0007] The compound eye structure includes at least two, the liquid storage container is arranged between the compound eye structures, and the liquid storage container is provided with a liquid injection hole.

[0008] Preferably, the shapes of the first through-hole and the second through-hole include any one of circular, square, and hexagonal shapes.

[0009] To solve the above problems, the present application also proposes: a preparation method for a compound eye master lens with adjustable focal length, which is used to prepare a compound eye master lens composed of a liquid sub-lens array with adjustable focal length as described in any one of the foregoing items. The method includes:

[0010] Obtain an outer frame and an inner frame, and perform pre-treatment;

[0011] Define the pre-treated inner frame as the base layer, and sequentially cover a transparent elastic film and the pre-treated outer frame in the vertical direction, and fix them to form a compound eye structure;

[0012] A liquid storage container is arranged between the compound eye structures, and a thin hard tube is inserted based on the liquid injection hole, and the gap is sealed by using ultraviolet light-curing glue;

[0013] Connect a liquid pumping mechanism to the other end of the thin hard tube, and inject or extract liquid into the liquid storage container through the liquid pumping mechanism. The liquid storage container correspondingly forms a pressure difference to drive the compound eye structure to deform, driving the transparent elastic film to bulge or sink.

[0014] Preferably, obtaining an outer frame and an inner frame, and performing pre-treatment includes:

[0015] Based on parametric modeling, open a first through-hole and a second through-hole on the outer frame and the inner frame respectively, and the first through-hole corresponds to the second through-hole, and adjust the curvature of the outer frame and the inner frame;

[0016] Perform pre-treatment by cleaning with isopropanol, UV strengthening, and nano-hydrophobic coating.

[0017] Preferably, the materials of the outer frame and the inner frame are any one of PLA, ABS, flexible TPU, PA, titanium alloy, stainless steel, carbon fiber composite material, and silicone rubber.

[0018] Preferably, the liquid pumping mechanism includes a first rubber tube, a water pump, a second rubber tube, and a syringe sequentially arranged close to the thin hard tube. Based on the first rubber tube and the second rubber tube, the syringe is driven by the water pump to perform any one of the operations of injecting liquid, extracting liquid, or cutting off liquid into the liquid storage container.

[0019] The present invention has the following beneficial effects:

[0020] 1. By combining a variable - focal - length square liquid lens structure with a lens array application, a compound - eye mother lens composed of a liquid sub - lens array with adjustable focal length proposed in this application is constructed. The liquid in the liquid storage container is controlled through the liquid injection hole, so that a pressure difference is formed inside and outside the compound - eye mother lens, driving the compound - eye structure to deform. The transparent elastic film is divided into multiple sub - lenses based on the corresponding centers of the first through - hole and the second through - hole, having the function of an "insect compound eye" and forming a lens array. The transparent elastic film bulges or depresses accordingly to adjust the focal length of the lens array, and also solves the problem of large spherical aberration. Since complex devices such as electrodes are not required, the measurement and calculation process is greatly simplified, that is, the current focal length is determined by the height or radian of the film bulge or depression, which has important technical and economic values. Moreover, the compound - eye mother lens structure proposed in this application is simple, easy to manufacture, and low - cost, improving the scope of application. Different shapes of the first through - hole and the second through - hole can increase the duty cycle according to actual applications.

[0021] 2. The present invention also provides a preparation method for a compound - eye mother lens with adjustable focal length, which is used to prepare the compound - eye mother lens composed of the above - mentioned liquid sub - lens array with adjustable focal length. This method has the same beneficial effects as the compound - eye mother lens composed of the above - mentioned liquid sub - lens array with adjustable focal length, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of a compound - eye mother lens composed of a liquid sub - lens array with adjustable focal length provided by an embodiment of the present invention;

[0024] Figure 2 It is an exploded view of the compound - eye structure of a compound - eye mother lens composed of a liquid sub - lens array with adjustable focal length provided by an embodiment of the present invention;

[0025] Figure 3 It is a top - view of the compound - eye structure of a compound - eye mother lens composed of a liquid sub - lens array with adjustable focal length provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the liquid storage container of a compound - eye mother lens composed of a liquid sub - lens array with adjustable focal length provided by an embodiment of the present invention;

[0027] Figure 5The flowchart of the steps for preparing a compound eye mother lens with adjustable focal length provided by an embodiment of the present invention;

[0028] In the figure:

[0029] 1. Liquid storage container; 2. Inner skeleton; 3. Transparent elastic film; 4. Outer skeleton; 5. Liquid injection hole. Specific embodiments

[0030] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following combines the accompanying drawings and preferred embodiments to detail the specific embodiments, structures, features, and effects of a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length and its preparation method provided by the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0032] The following specifically describes the specific solutions of a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length and its preparation method provided by the present invention with reference to the accompanying drawings.

[0033] Please refer to Figures 1-4 , which respectively show the structural schematic diagram of a compound eye mother lens composed of a liquid sub-lens array with adjustable focal length provided by the first embodiment of the present invention, the exploded view of the compound eye structure, the top view of the compound eye mother lens, and the structural schematic diagram of the liquid storage container, including:

[0034] Outer skeleton 4, inner skeleton 2, transparent elastic film 3, and liquid storage container 1;

[0035] The outer skeleton 4 and the inner skeleton 2 are correspondingly arranged in an arc shape. The outer skeleton 4 is provided with first through holes arrayed along the center, and the inner skeleton 2 is provided with second through holes corresponding to the first through holes. The transparent elastic film 3 is arranged between the inner skeleton 2 and the outer skeleton 4 to form a compound eye structure;

[0036] The compound eye structure includes at least two. The liquid storage container 1 is arranged between the compound eye structures, and the liquid storage container 1 is provided with a liquid injection hole 5.

[0037] It can be understood that the surface of the existing lens is spherical, resulting in spherical aberration in the lens array. However, the compound eye structure in the present application can form a quadratic surface, thereby reducing spherical aberration.

[0038] Preferably, the outer skeleton 4 and the inner skeleton 2 are correspondingly arranged in an arc shape. In this embodiment, the outer skeleton 4 and the inner skeleton 2 are hemispherical surfaces; in actual applications, the curvature of the surfaces of the outer skeleton 4 and the inner skeleton 2 changes according to the needs of the actual scenario and the requirements for imaging clarity, that is, it can start bending from a plane until a closed surface is formed at 360°.

[0039] Optionally, in this embodiment, the array arrangement of the first through holes and the second through holes is a "well" structure, that is, a three-dimensional matrix is formed, which can divide the transparent elastic film into nine sub-lenses; in addition, without affecting the overall structure and usability, the array arrangement of the first through holes and the second through holes can be a "cross" structure, that is, the transparent elastic film is divided into four sub-lenses, and the overall shape is a "field" structure.

[0040] Regarding the number setting of the first through holes and the second through holes, it can be changed according to actual needs. Generally, the through holes can cover the skeleton. Specifically, when the aperture of the through holes remains unchanged, the number of through holes increases as the skeleton becomes larger; when the number of through holes and the skeleton remain unchanged, the aperture of the through holes increases, and its range of values is generally 1-30 nm to improve flexibility to adapt to specific application scenarios; for example, in a mobile phone lens, the skeleton setting needs to be adjusted smaller, and if it is a vehicle-mounted lens, the skeleton can be adjusted larger.

[0041] Furthermore, the shapes of the first through holes and the second through holes include any one of circular, square, and hexagonal.

[0042] It can be explained that the duty cycle refers to the ratio of the area occupied by the microlens array to the total area of the lens. Generally, the duty cycle of the square microlens array is high, and the gap between the formed sub-lenses is small. There is a small gap between the circular sub-lenses. Therefore, according to the duty cycle requirements in actual applications, the shapes of the first through holes and the second through holes are adjusted to increase the duty cycle.

[0043] Understandably, by combining the variable-focus square liquid lens structure with the lens array application, a compound eye master mirror composed of a liquid sub-lens array with adjustable focal length proposed in this application is constructed. By controlling the liquid in the liquid storage container 1 through the liquid injection hole 5, a pressure difference is formed inside and outside the compound eye master mirror, driving the compound eye structure to deform. The transparent elastic film 3 is divided into multiple sub-lenses based on the corresponding positions of the first through hole and the second through hole, functioning as an "insect compound eye" and forming a lens array. The transparent elastic film 3 bulges or depresses accordingly to adjust the focal length of the lens array, and also solves the problem of large spherical aberration. Since no complex devices such as electrodes are required, the measurement and calculation process is greatly simplified, that is, the current focal length is determined by the height or curvature of the film bulge or depression, which has important technical and economic value. Moreover, the compound eye master mirror structure proposed in this application is simple, easy to manufacture, and low in cost, improving the scope of application. Different shapes of the first through hole and the second through hole can increase the duty cycle according to actual applications.

[0044] Please refer to Figure 5 , which shows the step flowchart of a method for preparing a compound eye master mirror with adjustable focal length provided in an embodiment of the present invention. That is, the second embodiment of the present invention provides a method for preparing a compound eye master mirror with adjustable focal length for preparing the compound eye master mirror composed of a liquid sub-lens array with adjustable focal length provided in the first embodiment. The method includes:

[0045] Step S1: Obtain the outer frame and the inner frame, and perform pre-treatment.

[0046] Step S2: Define the pre-treated inner frame as the base layer, sequentially cover the transparent elastic film and the pre-treated outer frame in the vertical direction, and fix them to form a compound eye structure.

[0047] Step S3: Set the liquid storage container between the compound eye structures, insert a thin hard tube based on the liquid injection hole, and use ultraviolet light-curing glue to bond the gaps for sealing.

[0048] Step S4: Connect a liquid pumping mechanism to the other end of the thin hard tube, inject or extract liquid into the liquid storage container through the liquid pumping mechanism, and the liquid storage container correspondingly forms a pressure difference to drive the compound eye structure to deform, driving the transparent elastic film to bulge or depress.

[0049] Preferably, in this embodiment, a photosensitive liquid crystal elastomer (LCE) is used as the transparent elastic film, and a gold nanoparticle (AuNPs) photothermal conversion layer is coated on its surface; without affecting the overall function, a titanium dioxide metasurface structure is etched on the surface of the transparent elastic film to form a broadband achromatic phase modulation layer. Combining the deformation of the compound eye structure caused by the liquid storage container, a dual-degree-of-freedom optical modulation of "mechanical zoom + metasurface wavefront control" is achieved. Specifically, by adjusting the liquid pressure in the liquid storage container, the transparent elastic film bulges or depresses to change the focal length. At the same time, the surface of the transparent elastic film is covered with countless nanocolumns thinner than hair. The optical path is finely adjusted through the nanocolumns to automatically correct the blur or dispersion caused by the deformation. By combining the two, a large range of zoom can be achieved, and aberration can be eliminated in real time.

[0050] Further, in step S1, it includes:

[0051] Step S11: Based on parametric modeling, the first through holes and the second through holes are respectively opened on the outer skeleton and the inner skeleton, and the first through holes correspond to the second through holes, and the arcs of the outer skeleton and the inner skeleton are adjusted;

[0052] Step S12: Pretreatment is carried out by cleaning with isopropyl alcohol, UV strengthening, and nano-hydrophobic coating.

[0053] Optionally, the inner skeleton and the outer skeleton can be made by any one of 3D printing technology, metal braiding technology, laser etching, and micro-injection molding process. Among them, 3D printing technology can precisely manufacture the inner skeleton and the outer skeleton by stacking materials layer by layer, which is beneficial for customized or small-batch production; metal braiding technology weaves materials such as metal wires and metal strips into a net and bends them mechanically or manually to form the inner skeleton and the outer skeleton with specific strength and flexibility; laser etching technology uses a high-energy laser beam to etch on the non-through-hole skeleton to obtain the inner skeleton and the outer skeleton, which is beneficial for miniaturized preparation; the micro-injection molding process manufactures the carbon fiber reinforced polyether ether ketone inner skeleton and the outer skeleton, that is, short carbon fibers are mixed with PEEK particles (Polyether Ether Ketone Granules), injected into a microporous mold at 280 °C, demolded after pressure holding and cooling, and the first through holes and the second through holes are opened by inserting needle-shaped ejector pins in the mold; in addition, the first through holes and the second through holes can be made of shape memory polymers (SMP). By locally irradiating with a near-infrared laser, that is, a laser beam with a wavelength of 808 nm, the deformation recovery of the SMP skeleton is triggered, and the deformation temperature is 45 °C, so as to dynamically adjust the corresponding distribution of the first through holes and the second through holes.

[0054] Understandably, the first through holes and the second through holes are respectively formed on the outer skeleton and the inner skeleton based on parametric modeling, that is, the structural strength and optical performance of the inner skeleton and the outer skeleton are balanced through gradient density design, the curved surface radian of the inner and outer skeletons is adjusted, and the curved surface accuracy of the microlens array is ensured by curing layer by layer with a layer thickness of 25 microns and supplemented with peripheral tree-shaped supports; then, through a series of pre-treatments such as isopropanol cleaning, UV strengthening and nano-hydrophobic coating, the light transmittance of the microlenses is improved, and they have both rigidity and lightweight characteristics.

[0055] Furthermore, the materials of the outer skeleton and the inner skeleton are any one of PLA, ABS, flexible TPU, PA, titanium alloy, stainless steel, carbon fiber composite material and silicone rubber.

[0056] As an optional implementation manner, the materials of the inner skeleton and the outer skeleton can be combined and adjusted according to the actual application scenario, that is, according to different material selections, the inner skeleton and the outer skeleton can also be divided into soft skeletons or rigid skeletons. Among them, the rigid skeleton can adjust the focal length of the sub-lens, while the flexible skeleton can adjust the focal lengths of both the mother lens and the sub-lens at the same time; it can be stated that the inner and outer skeletons can be prepared with flexible or rigid materials; or the inner skeleton is made of flexible material and the outer skeleton is made of rigid material; or the outer skeleton is made of flexible material and the inner skeleton is made of rigid material, so as to improve the performance and applicability; for example, in high-strength application scenarios, the skeleton is usually made of rigid material to effectively resist external impacts and pressures, provide necessary support and protection, and ensure that the compound eye mother lens can still work normally in harsh environments.

[0057] It should be noted that PLA (Poly-Lactic Acid, i.e., polylactic acid) is a biodegradable polymer with good biocompatibility and environmental protection characteristics. As a skeleton material, it can reduce environmental pollution while providing sufficient mechanical strength and heat resistance; ABS (Acrylonitrile Butadiene Styrene) has excellent impact resistance and heat resistance, can withstand harsh environments, and maintain good processing performance at the same time; flexible TPU (Thermoplastic Polyurethane) has excellent flexibility and wear resistance, can adapt to various complex working conditions, and ensure the stability and durability of the skeleton; PA (Polyamide) has the advantages of high strength, high wear resistance and good chemical resistance, and can maintain good performance under high load and harsh environments; titanium alloy is a metal material with high strength and low density, good corrosion resistance and high temperature resistance, and is suitable for the preparation of skeletons that require lightweight and high reliability; stainless steel has good corrosion resistance, ensuring the stable performance of the skeleton in various environments; carbon fiber composite materials, with their extremely high strength-to-weight ratio and stiffness-to-weight ratio, are especially suitable for the aerospace and high-end manufacturing fields; silicone rubber has excellent flexibility and good thermal stability, can maintain its physical and chemical properties unchanged at high temperatures, ensure that the compound eye mother lens will not be damaged due to temperature changes during use in high-temperature environments, and the silicone rubber has good light transmittance and will not have a negative impact on the imaging quality, ensuring clear images are provided; that is, the materials used to prepare the inner and outer skeletons each have their unique characteristics and advantages, and in actual applications, they are selected according to specific application requirements and performance requirements.

[0058] It should be noted that in step S3, the liquid storage container is arranged between the compound eye structures. A thin hard tube is inserted based on the injection hole and the gap is sealed with ultraviolet light-curing adhesive; among them, the ultraviolet light-curing adhesive has extremely strong bonding performance and can quickly cure under ultraviolet light irradiation to form a strong and sealed connection, which can ensure the reliability between the liquid storage container and the compound eye structure to prevent the liquid in the liquid storage container from leaking.

[0059] Furthermore, in step S4, the liquid pumping mechanism includes a first rubber tube, a water pump, a second rubber tube and a syringe arranged in sequence close to the thin hard tube. Based on the first rubber tube and the second rubber tube, the syringe is driven by the water pump to perform any one of the operations of injecting liquid, extracting liquid or blocking liquid into the liquid storage container.

[0060] Specifically, a first rubber tube is used to connect a thin rigid tube, and the other end of the thin rigid tube is connected to the liquid injection hole of the liquid storage container. The other end of the first rubber tube is successively connected to a water pump, a second rubber tube, and a syringe. After injecting or extracting liquid into the liquid storage container through the syringe, a pressure difference is formed inside and outside the liquid storage container, driving the deformation of the compound eye structure, and the transparent elastic film will also bulge or sink accordingly. The bulging film is divided into multiple sub-lenses under the action of the first through-hole and the second through-hole, constituting the function of an "insect compound eye" and forming a lens array. In addition, the amount of liquid injected or extracted can control the amplitude of the bulge or sink of the transparent elastic film. For example, for every 100 ml of liquid added, the liquid level height increases correspondingly to form a certain increase in liquid pressure. According to different actual requirements, the amount of liquid in the liquid storage container will be adjusted correspondingly according to the liquid pumping mechanism, thereby indirectly adjusting the lens focal length and forming a compound eye master mirror composed of a liquid sub-lens array with adjustable focal length.

[0061] It should be noted that the above-mentioned sequence of embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

Claims

1. A compound eye master mirror composed of a liquid microlens array with adjustable focal length, characterized in that, Comprising: An outer skeleton, an inner skeleton, a transparent elastic film, and a liquid storage container; The outer skeleton and the inner skeleton are correspondingly arranged in an arc shape. A first through hole is arrayed along the center on the outer skeleton, and a second through hole corresponding to the first through hole is provided on the inner skeleton. The transparent elastic film is arranged between the inner skeleton and the outer skeleton to form a compound eye structure; At least two of the compound eye structures are included. The liquid storage container is arranged between the compound eye structures, and a liquid injection hole is provided on the liquid storage container.

2. The compound eye mother lens composed of a liquid sub-lens array with adjustable focal length according to claim 1, characterized in that, The shapes of the first through hole and the second through hole include any one of circular, square, and hexagonal.

3. A preparation method of a compound eye master mirror with adjustable focal length, characterized in that, For preparing a compound eye master mirror composed of a liquid microlens array with adjustable focal length as described in any one of claims 1 to 2, the method includes: Obtaining an outer skeleton and an inner skeleton, and performing pretreatment; Defining the pretreated inner skeleton as a base layer, successively covering a transparent elastic film and the pretreated outer skeleton in the vertical direction, and fixing to form a compound eye structure; The liquid storage container is arranged between the compound eye structures. Insert a thin hard tube based on the liquid injection hole and use ultraviolet light-curing glue to bond the gap for sealing; Connect a liquid pumping mechanism to the other end of the thin hard tube. Inject or extract liquid into the liquid storage container through the liquid pumping mechanism. The liquid storage container correspondingly forms a pressure difference to drive the compound eye structure to deform, driving the transparent elastic film to bulge or sink.

4. The preparation method of a compound eye master mirror with adjustable focal length according to claim 3, characterized in that, Obtaining an outer skeleton and an inner skeleton, and performing pretreatment, including: Based on parametric modeling, a first through hole and a second through hole are respectively opened on the outer skeleton and the inner skeleton, and the first through hole and the second through hole correspond to each other, and the arcs of the outer skeleton and the inner skeleton are adjusted; Perform pretreatment by cleaning with isopropyl alcohol, UV strengthening, and nano-hydrophobic coating.

5. The preparation method of a compound eye mother lens with adjustable focal length according to claim 4, characterized in that, The materials of the outer skeleton and the inner skeleton are any one of PLA, ABS, flexible TPU, PA, titanium alloy, stainless steel, carbon fiber composite material, and silicone rubber.

6. The preparation method of a compound eye mother lens with adjustable focal length according to claim 3, characterized in that, The liquid pumping mechanism includes a first rubber tube, a water pump, a second rubber tube, and a syringe arranged in sequence close to the thin hard tube. Based on the first rubber tube and the second rubber tube, any one of injecting liquid, extracting liquid, or blocking liquid into the liquid storage container is performed by driving the syringe through the water pump.

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