Flexible pen point, micron liquid film preparation device and preparation method thereof

Abstract

The invention relates to a flexible pen point and a micron liquid film preparation device and method, a first brush body and a second brush body are arranged in an outlet runner of the flexible pen point, a plurality of long brushes of the second brush body are located between adjacent short brushes of the first brush body, and the flexible pen point serves as a spray nozzle outlet of the micron liquid film preparation device. During preparation, the first brush body is driven to move back and forth relative to the second brush body to drive the short brush and the long brush to swing back and forth, so that a solution in the spray head flows to the tail end of the long brush through the outlet flow channel, the first liquid supply hole of the first brush body and the second liquid supply hole of the second brush body by a capillary phenomenon, and a liquid cone is formed and is directly written on a collecting device which moves relatively; the micron liquid film is prepared through micro-pen direct writing, smooth direct writing of a high-concentration and high-viscosity solution can be achieved, the uniformity, smoothness and surface quality of liquid film preparation are improved, the width of the liquid film is easy to regulate and control, the machining precision and preparation efficiency of the micron liquid film are improved, and the application range of the micron liquid film is widened.

Description

Technical Field

[0001] The present invention belongs to the technical field of micro-pen direct writing, and in particular relates to a flexible pen tip, a micron liquid film preparation device and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development of the fields of microelectronics, precision machinery, MENS, etc., processing and preparation methods that can perform micron and nanometer precision have become increasingly valued, and the preparation method of liquid film products has become one of the important means to promote the development of disciplines such as precision mechanics, materials science, and microelectronics. Therefore, it is necessary to develop a micron liquid film preparation device and its preparation method to improve preparation efficiency, product quality and scope of application, and meet the application needs of microfluidics, biomedicine, energy, optics and other fields.

[0003] Common liquid film manufacturing methods include: casting method, such as that used to make polyimide (PI) liquid film; sol-gel hydrothermal method, such as that used to make ATO conductive liquid film; near-field direct writing electrospinning method, such as that used to make fiber film. In comparison, the micro-pen direct writing method has the advantages of achieving higher graphic accuracy through a computer-controlled nozzle, directly writing regular or complex geometric shapes, without relying on prefabricated masks, avoiding the tedious process of mask preparation, and being applicable to a variety of material systems including polymers, hydrogels, and biocompatible materials. However, the preparation of micron liquid films still faces the following technical problems:

[0004] (1) Risk of nozzle blockage / uneven liquid film: For high-concentration, high-viscosity solutions, such as slurries containing high molecular weight polymers and nanoparticles, which have poor fluidity, static shear force is easily formed in the nozzle with a small aperture, resulting in solution retention and solidification, and mechanical blockage, which limits the applicable range of solution concentration for micro-pen direct writing. Although, for example, patent CN116353212A discloses a pneumatic-assisted piezoelectric vibration direct writing spray pen device and application, which drives the piezoelectric ceramic ring to vibrate through a signal generator and a power amplifier, and combines the pneumatic assistance provided by the air compressor to eject electronic material ink from the nozzle to improve the injection problem of high-viscosity liquids, controlling liquid injection through pressure regulation and vibration combination increases the control difficulty. It is easy to cause flow interruption due to insufficient driving pressure to overcome the viscous resistance of the high-viscosity solution, or to destroy the stability of the liquid column due to uneven pressure or unstable vibration, resulting in injection dispersion or splashing problems, causing inconsistent liquid volume in a single injection, unstable liquid distribution, and forming a liquid film of uneven thickness after deposition, affecting the quality of the micron liquid film product. For example, if the liquid film is locally too thick or too thin, it will form a stress gradient or affect the functional properties of the material.

[0005] (2) Poor flatness / surface quality: Existing direct writing equipment mostly uses rigid pen tips such as metal nozzles. When writing directly close to the substrate / deposited film surface, it is easy to scratch the deposited liquid film due to Z-axis height control errors, forming scratches, structural deformation or damaging the substrate, resulting in the final deposited film surface flatness or surface quality deteriorating, making it difficult to adapt to the microscopic undulations of the substrate, resulting in a decrease in yield, an increase in post-processing steps, affecting production efficiency, and limiting application scenarios.

[0006] (3) Difficulty in controlling the width of the liquid film: The inner diameter of the traditional micro-pen nozzle is fixed, and it is difficult to adjust the width. For example, even if the flow rate is increased by increasing the pressure, the low diffusivity of the high-viscosity solution will cause the liquid film width to approach the theoretical limit of the nozzle inner diameter and cannot be further widened. At the same time, although increasing the pressure can increase the flow rate, it may also aggravate the instability of the injection, resulting in a limited range of width control. Micro-pen direct writing is usually a serial process, and large-area liquid films need to be spliced line by line. The time consumption increases linearly with the area, affecting the preparation efficiency and micro-scale processing accuracy. Summary of the Invention

[0007] The present invention aims to solve at least one of the above-mentioned technical problems to a certain extent. The present invention provides a flexible pen tip, a micron liquid film preparation device and a preparation method thereof. The micron liquid film is prepared by direct writing with a micro pen, which can achieve smooth direct writing of high-concentration and high-viscosity solutions, reduce the control difficulty, improve the uniformity, flatness and surface quality of liquid film preparation, make the liquid film width easy to control, and is conducive to improving the processing accuracy, preparation efficiency and scope of use of the micron liquid film.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] The first aspect of the present invention is to provide a flexible pen tip, including an outlet flow channel and a first driving mechanism, wherein a first brush body and a second brush body are provided in the outlet flow channel, the first brush body is provided with a plurality of first liquid supply holes and short brushes, the second brush body is provided with a plurality of second liquid supply holes and a long brush, the second liquid supply holes are connected with the inside of the outlet flow channel through the first liquid supply holes, the second liquid supply holes are located between adjacent short brushes and long brushes, and the plurality of long brushes are respectively located between adjacent short brushes, and the first driving mechanism is used to drive the first brush body to reciprocate relative to the second brush body, and drive the short brush and the long brush to swing back and forth.

[0010] In order to further improve the surface quality of the liquid film, in a preferred technical solution, the long brush and the short brush are made of flexible material.

[0011] In order to further promote uniform flow and distribution of the solution and improve the uniformity of the liquid film, in a preferred technical solution, a plurality of first liquid supply holes and a plurality of second liquid supply holes are respectively arranged in a one-to-one correspondence, and the moving stroke of the first brush body is ≤ the length of the second liquid supply hole.

[0012] In order to further reduce the risk of nozzle blockage caused by solution viscosity, high-frequency vibration drive can be used. In a preferred technical solution, an elastic support is provided between the first brush body and the outlet flow channel, and the first driving mechanism includes an exciter connected to the first brush body.

[0013] In order to further facilitate the change of the width of the direct-writing liquid film, in a preferred technical solution, multiple groups of first brush bodies and second brush bodies detachably connected to the outlet flow channel are included.

[0014] The second aspect of the present invention is to provide a micron liquid film preparation device, including a nozzle and a collection device, the nozzle inlet is connected to a liquid supply device, the nozzle outlet is provided with a flexible pen head as described in any one of the above items, and the long brush and the short brush are facing the collection device.

[0015] In order to further expand the concentration range of the solution used for micro-pen direct writing, in a preferred technical solution, the nozzle inlet is connected to an air supply device.

[0016] In order to further improve the flatness of the product and the uniformity of liquid film preparation, in the preferred technical solution, the nozzle is provided with an air cavity, a first buffer cavity and a liquid supply channel which are connected in sequence, the air cavity is connected to the air supply device, the first buffer cavity is connected to the liquid supply device, and the liquid supply channel is connected to the outlet channel.

[0017] In order to further improve the uniformity of liquid film preparation, in a preferred technical solution, a plurality of liquid supply channels are provided, and a second buffer cavity is provided between the plurality of liquid supply channels and the outlet channel.

[0018] In order to further improve the efficiency, stability and dimensional accuracy of liquid film preparation, a preferred technical solution includes a second driving mechanism, which is used to drive the collecting device to move relative to the nozzle, or the nozzle to move relative to the collecting device in a three-dimensional direction.

[0019] A method for preparing a micron liquid film, based on any one of the above-mentioned micron liquid film preparation devices, the preparation method comprising:

[0020] The first driving mechanism drives the first brush body to move back and forth relative to the second brush body, driving the short brush and the long brush to swing back and forth;

[0021] The liquid supply device delivers the solution required for direct writing of liquid film to the nozzle, so that the solution flows to the end of the long brush through capillary phenomenon, forming a liquid cone and directly writing on the collecting device. The relative movement of the nozzle and the collecting device is controlled, and finally the micron liquid film product is deposited.

[0022] In order to further control the preparation efficiency and micro-scale processing accuracy of the liquid film, in the preferred technical solution, the number / size of the first brush body and the second brush body is controlled; and / or, the solution flow rate is controlled; and / or, the gas supply device is used to supply gas pressure to the nozzle to control the gas flow rate; and / or, the output frequency / amplitude range of the first driving mechanism is controlled; and / or, the motion trajectory is set according to the micron liquid film, and the second driving mechanism drives the collecting device relative to the nozzle, or the nozzle moves relative to the collecting device in three dimensions along the motion trajectory to control the motion trajectory, positioning accuracy, load control speed, and stroke of the second driving mechanism.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The flexible pen tip and micron liquid film preparation device of the present invention provide a certain amount of reciprocating movement for the first brush body with the help of the first driving mechanism, so that the reciprocating swing of the short brush drives the swing of the adjacent long brush. Combined with the synergistic effect of the capillary effect, the flow resistance can be effectively reduced and the flow of the solution can be promoted. In particular, when performing micro-pen direct writing operations with high-concentration and high-viscosity solutions, the risk of nozzle blockage caused by solution viscosity can be effectively reduced. At the same time, the liquid is prompted to form a stable liquid cone at the end of the long brush fiber, reducing the risk of liquid injection due to uneven pressure or unstable vibration, effectively reducing the control difficulty, achieving smooth and stable direct writing, and expanding the solution concentration range for micro-pen direct writing, which is conducive to precise control of liquid spreading and improving the uniformity of micron liquid film preparation.

[0025] (2) The flexible pen tip and micron liquid film preparation device of the present invention adopt a long brush-short brush alternating array structure made of flexible material to form a flexible structure, which can replace the rigid pen tip to reduce the risk of damage to the substrate / liquid film deposition structure and further improve the flatness and surface quality of the liquid film.

[0026] (3) The flexible pen tip and micron liquid film preparation device of the present invention adopt multiple groups of first brush bodies and second brush bodies that can be detachably connected. Through combined assembly, cross-scale adjustment of the liquid film width can be achieved, making the liquid film width easy to control, and further controlling the micron liquid film preparation efficiency and microscale processing accuracy.

[0027] (4) The micron liquid film preparation device and method of the present invention utilizes micro-pen direct writing to prepare micron liquid film, which can be further optimized by optimizing the nozzle liquid supply structure, controlling the relative movement of the nozzle and the collecting device, and finally depositing to form a micron liquid film product, thereby further improving the uniformity of liquid film preparation, preparation efficiency and micro-scale processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0029] Figure 1is a schematic structural diagram of embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic structural diagram of the first brush body and the second brush body of Example 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the working principle of Example 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the assembly of embodiment 2 of the present invention;

[0033] Figure 5 It is a structural diagram of embodiment 3 of the present invention.

[0034] Markings in the figure: air supply device 1, air cavity 2, nozzle 3; flexible pen tip 4, first brush body 41, first liquid supply hole 411, short brush 412, second brush body 42, second liquid supply hole 421, long brush 422, through hole 423, elastic support 43, outlet flow channel 44, shell 441, cover plate 442, mounting groove 443; collecting device 5, second driving mechanism 6, first driving mechanism 7, liquid supply flow channel 8, first buffer cavity 9, liquid supply device 10, second buffer cavity 11. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "up", "down", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. The materials and instruments used in this embodiment, without specific manufacturer and model information, are all commercially available products.

[0038] Example 1:

[0039] In view of the problem that the nozzle 3 is blocked / the liquid film is uneven when preparing micron liquid film by micro-pen direct writing in the prior art, which leads to the problem that the application scope of micron liquid film preparation is limited, the efficiency is low, and the product quality is poor, the present invention considers improving the structure of the pen tip to promote the smooth and stable direct writing of the solution to improve this problem, such as Figures 1-2 As shown, a preferred embodiment of the flexible pen tip 4 of the present invention, the flexible pen tip 4 includes an outlet flow channel 44 and a first driving mechanism 7, a first brush body 41 and a second brush body 42 are provided in the outlet flow channel 44, the first brush body 41 is provided with a plurality of first liquid supply holes 411 and short brushes 412, the second brush body 42 is provided with a plurality of second liquid supply holes 421 and a long brush 422, the second liquid supply hole 421 is connected with the inside of the outlet flow channel 44 through the first liquid supply hole 411, the second liquid supply hole 421 is located between adjacent short brushes 412 and long brushes 422, and a plurality of long brushes 422 are respectively located between adjacent short brushes 412, and the first driving mechanism 7 is used to drive the first brush body 41 to move back and forth relative to the second brush body 42, and drive the short brush 412 and the long brush 422 to swing back and forth.

[0040] For example, Figure 1 As shown, the outlet flow channel 44 includes a hollow shell 441 and a cover plate 442. The outlet flow channel 44 is formed inside the shell 441. A mounting groove 443 is provided in the shell 441. The first brush body 41 and the second brush body 42 are horizontally arranged in the mounting groove 443. The first brush body 41 is located above the second brush body 42. The second brush body 42 is provided with a plurality of through holes 423 so that the short brush 412 can pass through the through holes 423 and hang down. The cover plate 442 is covered under the second brush body 42 and connected to the shell 441 to facilitate the disassembly and assembly of the first brush body 41 and the second brush body 42. The movement of the second brush body 42 is restricted by cooperating with the second brush body 42 through the mounting groove 443. The length of the long brush 422 is greater than the length of the short brush 412. The plurality of long brushes 422 are respectively located between adjacent short brushes 412. The working principle of the above-mentioned flexible pen head 4 may include:

[0041] like Figure 3As shown in (a), in the initial state, the first liquid supply hole 411, the second liquid supply hole 421 and the outlet flow channel 44 are connected, and the long brush 422 and the short brush 412 naturally hang down vertically under the action of gravity, shaped like a flat brush; Figure 3 As shown in (b), after the first driving mechanism 7 drives the first brush body 41 to move leftward relative to the second brush body 42, the short brush 412 on the first brush body 41 is driven to swing rightward under the action of inertia, and hits the drooping adjacent long brush 422, causing the adjacent long brush 422 to be stressed and swing rightward. At this time, the first liquid supply hole 411, the second liquid supply hole 421 and the interior of the outlet flow channel 44 are still connected; Figure 3 As shown in (c), after the first driving mechanism 7 drives the first brush body 41 to move rightward relative to the second brush body 42, the short brush 412 on the first brush body 41 is driven to swing leftward under the action of gravity and inertia, causing the adjacent long brush 422 to swing leftward under the action of gravity and the impact of the short brush 412 on the other side of the long brush 422. At this time, the first liquid supply hole 411, the second liquid supply hole 421 and the interior of the outlet flow channel 44 are still connected; Figure 3 As shown in (d), as the first brush body 41 moves back and forth continuously / at high frequency relative to the second brush body 42, the short brush 412 and the long brush 422 swing back and forth respectively, so that the solution required for direct writing of the liquid film, such as the spinning solution, can penetrate from the outlet channel 44, the first liquid supply hole 411, and the second liquid supply hole 421 to the root gap between the adjacent long brushes 422 and the short brush 412, and the tiny gap between the long brush 422 and the short brush 412 is used to generate capillary suction, so that the liquid flows to the end of the long brush 422 to form a liquid cone, thereby performing smooth direct writing.

[0042] Compared with the existing pen tip / nozzle 3, which is prone to the risk of outlet blockage caused by solution viscosity, the first driving mechanism 7 provides a certain amount of reciprocating movement for the first brush body 41, and the reciprocating swing of the short brush 412 drives the adjacent long brush 422 to swing through mechanical coupling, forming a periodic disturbance, strengthening the capillary flow of the liquid between the long brushes 422, which can effectively reduce the flow resistance and promote the flow of the solution. Especially when carrying out micro-pen direct writing operations with high-concentration and high-viscosity solutions, it can effectively reduce the risk of nozzle 3 blockage caused by solution viscosity, achieve smooth direct writing, and expand the solution concentration range for micro-pen direct writing; at the same time, compared with the solution being directly ejected from the nozzle, it is easy to cause uneven pressure or unstable vibration, etc. The risk of liquid injection, unstable distribution, and uneven liquid film can be eliminated. The reciprocating swing of the short brush 412 of the flexible pen tip 4 can break the static balance of the liquid surface tension, and the capillary effect can cause the liquid to form a stable liquid cone at the end of the long brush 422 fiber, rather than the high-pressure injection of the traditional nozzle, thereby avoiding the jet splitting or dripping caused by the high pressure of the traditional nozzle, simplifying the liquid transmission process, and eliminating the need for complex pressure regulation and vibration combination to achieve liquid injection, effectively reducing the control difficulty, and achieving good release and uniform distribution of the liquid through the synergistic effect of mechanical movement and capillary effect, which is conducive to the precise control of the liquid spread and improving the uniformity of micron liquid film preparation.

[0043] In view of the current situation in which the flatness / surface quality of micron liquid films prepared by the micro-pen direct writing method in the prior art is poor due to the rigidity of the pen tip, the present invention considers using a flexible pen tip 4 to replace the rigid pen tip to reduce the risk of damage to the substrate / liquid film deposition structure. Furthermore, the long brush 422 and the short brush 412 are made of flexible materials. For example, the material used for the long brush 422 and the short brush 412 is preferably fluoroplastic FEP, which has a low dielectric constant and friction coefficient, as well as excellent weather resistance. Compared with the rigid pen tip, it is easy to scratch the substrate / deposited structure when writing directly close to the substrate / deposited film surface. The flexible pen tip 4 adopts an alternating array structure of long brushes 422 and short brushes 412 made of flexible material to form a flexible structure. By utilizing the adaptive characteristics of the flexible structure, it can conform to the curved surface, improve contact uniformity, reduce the risk of scratching, and further improve the surface quality of the liquid film.

[0044] Furthermore, the plurality of first liquid supply holes 411 and the plurality of second liquid supply holes 421 are respectively arranged in a one-to-one correspondence, and the moving stroke of the first brush body 41 is less than or equal to the length of the second liquid supply hole 421; for example, Figures 1 to 3 As shown, the first brush body 41 is provided with a dense array of first liquid supply holes 411, and the second liquid supply holes 411 are arranged corresponding to the first liquid supply holes 411. Compared with the correspondence between a larger first liquid supply hole 411 and multiple second liquid supply holes 421, the one-to-one correspondence can make the liquid supply positions evenly distributed, further promote the uniform flow and distribution of the solution, so as to improve the uniformity of the liquid film. At the same time, the size of the through hole 423 can be used to form a limit for the end brush, forming a stroke limit for the first brush body 41. If the second liquid supply hole 421 is a circular hole, the moving stroke of the first brush body 41 is ≤ the diameter of the second liquid supply hole 421, so that during the movement of the first brush body 41, the first liquid supply hole 411 and the second liquid supply hole 421 are always connected to maintain liquid supply.

[0045] Furthermore, an elastic support 43 is provided between the first brush body 41 and the outlet flow channel 44. The first driving mechanism 7 includes an exciter connected to the first brush body 41, for example: Figure 1 As shown, the elastic support 43 is a spring arranged between the two sides of the first brush body 41 and the shell 441, the vibrator is installed outside the shell 441, and the output shaft of the vibrator passes through the shell 441 to connect / contact the first brush body 41, then the first brush body 41 can be elastically supported by the spring 43, and the first brush body 41 is driven by the vibrator to reciprocate at a high frequency relative to the second brush body 42 and the outlet flow channel 44, so that the short brush 412 obtains a certain amount of vibration, and then the short brush 412 vibrates to drive the long brush 422 to promote the flow of solution. Preferably, the output frequency of the vibrator is: 5Hz~20Hz, and the amplitude range of the vibrator is: 400μm~40000μm. The use of high-frequency vibration drive further reduces the risk of blockage of the nozzle 3 caused by solution viscosity and simplifies the drive.

[0046] Example 2:

[0047] The traditional micro-brush nozzle 3 has a fixed inner diameter and is difficult to adjust in width. Figure 4 As shown, another preferred embodiment of the flexible pen tip 4 of the present invention is shown, which differs from Example 1 in that the flexible pen tip 4 includes multiple groups of first brush bodies 41 and second brush bodies 42 detachably connected to the outlet flow channel 44.

[0048] For example, Figure 4 As shown, the flexible pen tip 4 can adopt a modular design. After removing the cover plate 442, multiple groups of first brush bodies 41 and second brush bodies 42 can be assembled in parallel. After installation, the width of the pen tip can be increased, so that the flexible pen tip 4 has a larger area of direct contact with the surface of the collecting device 5, and a wide micron liquid film direct writing can be performed to obtain a liquid film with sufficient width to improve the preparation efficiency; similarly, when the width of the pen tip needs to be reduced, one or more groups of first brush bodies 41 and second brush bodies 42 can be removed and replaced with baffles or short brushes 412 and long brushes 422 with different distribution densities of first brush bodies 41 and second brush bodies 42 to change the width of the pen tip, which is suitable for high-precision micron liquid film direct writing scenarios with smaller widths to improve micro-scale processing accuracy; it can also By controlling the lengths of the short brush 412 and the long brush 422 of different first brush bodies 41 and second brush bodies 42, for example, a gradient pen tip can be formed for direct writing of a wedge-shaped liquid film with continuously changing thickness; or by controlling the materials of the short brush 412 and the long brush 422 of different first brush bodies 41 and second brush bodies 42 for combined direct writing; thereby further enabling the flexible pen tip 4 to achieve good release and uniform distribution of the liquid through the synergistic effect of mechanical vibration and capillary effect, thereby avoiding the problem of unstable jetting, and facilitating the change of the width of the direct-written liquid film. By assembling first brush bodies 41 and second brush bodies 42 modules of different specifications, continuous cross-scale adjustment of the liquid film width can be achieved, thereby further controlling the efficiency of micron liquid film preparation and the microscale processing accuracy.

[0049] Example 3:

[0050] like Figure 5 As shown, a preferred embodiment of the micron liquid film preparation device of the present invention, the micron liquid film preparation device includes a nozzle 3 and a collecting device 5, the inlet of the nozzle 3 is connected to the liquid supply device 10, and the outlet of the nozzle 3 is provided with a flexible pen head 4 as described in Example 1, and the long brush 422 and the short brush 412 are facing the collecting device 5.

[0051] For example, Figure 5As shown, the outlet of the nozzle 3 is connected to the shell 441 of the flexible pen tip 4, so that the outlet flow channel 44 serves as the outlet of the nozzle 3. The liquid supply device 10 uses a solution pump, and the solution pump model used is Lange TJ-3A, and the preferred flow range is: 0.505μl / min-5.05ml / min; the solution pump can deliver the solution required for direct writing of the liquid film, such as the spinning solution, to the nozzle 3 through the pipeline, so that the solution is extruded until the flexible pen tip 4, and the vibrator provides a certain amount of vibration to the first brush body 41. The short brush 412 is driven and drives the long brush 422. The solution flows to the end of the long brush 422 through capillary phenomenon, forming a liquid cone and finally directly writing on the collecting device 5. During the direct writing process, the nozzle 3 and the collecting device 5 are controlled to move relative to each other, and a liquid film with a sufficient width is obtained by direct writing, which is finally deposited to form a micron liquid film product.

[0052] When the above-mentioned micron liquid film preparation device uses a high-concentration, high-viscosity solution to carry out micro-pen direct writing operations, the first driving mechanism 7 is used to provide a certain amount of reciprocating movement for the short brush 412, which can promote the flow of solution and reduce the risk of blockage of the nozzle 3 due to solution viscosity. It can effectively avoid the blockage of the nozzle 3 and achieve smooth direct writing of high-concentration, high-viscosity solutions. At the same time, it reduces the liquid injection problems caused by uneven pressure or unstable vibration, ensures the uniformity of liquid film preparation, and thus expands the solution concentration range used for micro-pen direct writing.

[0053] Furthermore, the inlet of the nozzle 3 is connected to the air supply device 1; for example, Figure 5 As shown, the air supply device 1 adopts an air pump, which is connected to the inlet of the nozzle 3 through a pipeline. The air pump used is Lange TS-1B, and the flow range is: 0.505μl / min-5.05ml / min. It provides air pressure. The flexible pen tip 4 can achieve good release and uniform distribution of the liquid through the synergistic effect of mechanical vibration and capillary effect, avoiding the problem of unstable injection. The solution can be squeezed from the nozzle 3 to the flexible pen tip 4 under the action of its own weight and air pressure, which can further overcome the viscosity of the solution and expand the concentration range of the solution used for micro-pen direct writing.

[0054] Furthermore, the nozzle 3 is provided with an air cavity 2, a first buffer cavity 9 and a liquid supply channel 8 which are connected in sequence. The air cavity 2 is connected to the air supply device 1, the first buffer cavity 9 is connected to the liquid supply device 10, and the liquid supply channel 8 is connected to the outlet channel 44; for example, Figure 5 As shown, the air cavity 2 is located above the first buffer cavity 9, and the air pump is connected to the air cavity 2 through a pipeline for buffering and providing a more stable air pressure. The solution pump is connected to the first buffer cavity 9 through a pipeline for buffering and providing a more stable solution. The solution is squeezed to the outlet flow channel 44 through the liquid supply channel under the action of its own weight and air pressure, which is beneficial to further improve the product flatness and uniformity of liquid film preparation through the stable distribution of the solution in the nozzle 3.

[0055] Furthermore, the liquid supply channel 8 is provided with a plurality of channels, and a second buffer chamber 11 is provided between the plurality of liquid supply channels 8 and the outlet channel 44; for example: Figure 5 As shown, one end of each of the multiple vertically arranged liquid supply channels is connected to the first buffer chamber 9, respectively, to divert the solution at the inlet of the single first buffer chamber 9 into multiple independent streams, thereby reducing the flow pressure of the single liquid supply channel and preliminarily homogenizing the liquid flow rate, which is particularly suitable for high-viscosity solutions. The other ends of the multiple vertically arranged liquid supply channels are connected to the horizontal liquid supply channel, so that the solution can diffuse from the horizontal liquid supply channel to the left and right sides, forming a two-way flow into the second buffer chamber 11. The cross-section of the second buffer chamber 11 is a T-shaped structure, which eliminates the turbulence caused by the fluid impact through the sudden change of the cross-section, thereby further buffering, improving the stability of the solution transportation, and further improving the uniformity of the liquid film preparation.

[0056] Furthermore, it includes a second driving mechanism 6, which is used to drive the collecting device 5 to move relative to the nozzle 3, or the nozzle 3 to move relative to the collecting device 5 in three dimensions; for example: Figure 5 As shown, the collecting device 5 is a collecting plate, and the second driving mechanism 6 is a motion platform connected to the bottom of the collecting plate. The selected motion platform is a PDV PT-GD140G high-precision mobile platform with a repeatability of 5 μm, an absolute positioning accuracy of 8 μm, a no-load speed of 0 mm / min to 500 mm / min, and a stroke of 50 mm to 500 mm. The nozzle 3 is fixed with a bracket, and the collecting plate can be driven to move in three axes relative to the nozzle 3 according to a preset motion path. The technical principle of the additive direct writing method is based on accumulation. The computer is used to control the motion platform to drive the collecting plate to move according to a predetermined trajectory, and the direct writing solution is deposited at the collecting device 5 into a desired specific pattern, which can further improve the efficiency, stability and dimensional accuracy of liquid film preparation.

[0057] Example 4:

[0058] A preferred embodiment of the micron liquid film preparation method of the present invention is based on the micron liquid film preparation device described in Example 3 above, and the preparation method includes:

[0059] The first driving mechanism 7 drives the first brush body 41 to move back and forth relative to the second brush body 42, driving the short brush 412 and the long brush 422 to swing back and forth;

[0060] The liquid supply device 10 delivers the solution required for direct writing of the liquid film to the nozzle 3, so that the solution flows to the end of the long brush 422 through capillary action, forming a liquid cone and directly writing on the collecting device 5. The nozzle 3 and the collecting device 5 are controlled to move relative to each other, and finally deposited to form a micron liquid film product.

[0061] For example, the above preparation method may include the following steps:

[0062] (1) Prepare the solution required for direct writing liquid film and load it into the liquid supply device 10. According to the direct writing width requirement, assemble and install the flexible pen tip 4.

[0063] (2) Check the connection status of each component. The flexible pen tip 4 is placed with a collecting plate below. The collecting plate is placed on a moving platform. Adjust the collecting plate to determine the starting position of direct writing. According to the specific pattern expected by the micron liquid film, set the movement trajectory of the collecting plate on the moving platform.

[0064] (3) Turn on the solution pump and the air pump, and the solution reaches the nozzle 3 through the pipeline. The flexible pen tip 4 is stably supplied with liquid. Turn on the vibrator to provide a certain amount of vibration to the short brush 412. The vibration of the short brush 412 then drives the long brush 422. In this way, the solution can flow to the end of the long brush 422 through capillary phenomenon, forming a liquid cone.

[0065] (4) The motion platform drives the collection plate to move along the motion trajectory set in step (2). The flexible pen tip 4 is in direct contact with the surface of the collection plate. The liquid cone on the flexible pen tip 4 is evenly coated on the collection plate. The flexible pen tip 4 is in direct contact with the surface of the collection plate over a large area. Direct writing obtains a liquid film with sufficient width, which is finally deposited to form a complete micron liquid film.

[0066] The above-mentioned method for preparing micron liquid film uses a solution pump to transport the solution, an air pump to provide air pressure, and at the same time uses an exciter to vibrate the short brush 412 of the flexible pen tip 4 to drive the long brush 422, and uses the capillary phenomenon to make the spinning liquid form a liquid cone for direct writing. There is no need for complex pressure control and vibration combination to achieve liquid injection. Only relying on capillary action can achieve good liquid distribution at the pen tip, which simplifies the liquid transmission process, reduces the risk of liquid injection caused by uneven pressure or unstable vibration, and ensures the uniformity of liquid film preparation. It can solve the problems of the existing technology in preparing micron liquid films, such as complex procedures, low preparation efficiency, poor product flatness, poor surface quality, and rigid pen tips that are extremely easy to scratch the deposited structure.

[0067] Furthermore, methods for further controlling the preparation efficiency and micro-scale processing accuracy of the liquid film include:

[0068] Control the number / size of the first brush body 41 and the second brush body 42; for example, increasing the number of the first brush body 41 and the second brush body 42 can expand the liquid distribution area, improve the liquid film coverage efficiency, and improve the preparation efficiency. By adjusting the array density and size of the first brush body 41 and the second brush body 42, direct writing solutions of different viscosities can be matched, further optimizing the uniformity of solution transmission.

[0069] And / or, controlling the solution flow rate; for example, controlling the solution flow rate may match the permeability of the first liquid supply hole 411 and the second liquid supply hole 421 .

[0070] And / or, the gas supply device 1 delivers gas to the nozzle 3 to provide air pressure and control the gas flow rate; for example, the air pressure assists in pushing the solution through the first liquid supply hole 411 and the second liquid supply hole 421, which can further overcome the viscous resistance, reduce the blockage of the nozzle 3, and expand the scope of application of the process.

[0071] And / or, control the output frequency / amplitude range of the first driving mechanism 7; for example, the output frequency and amplitude of the movement of the short brush 412 are associated with the capillary effect strength and the liquid spreading speed. High-frequency and low-amplitude vibrations can promote uniform dispersion of the liquid, and low-frequency and high-amplitude vibrations can enhance the driving force of liquid flow, which is suitable for high-viscosity solutions.

[0072] And / or, according to the motion trajectory set by the micron liquid film, the second driving mechanism 6 drives the collecting device 5 relative to the nozzle 3, or the nozzle 3 moves relative to the collecting device 5 in the three-dimensional direction along the motion trajectory, and controls the motion trajectory, positioning accuracy, load control speed, and stroke of the second driving mechanism 6; for example: according to the liquid film design requirements, such as straight lines, curves, complex patterns, etc., the relative motion path of the collecting device 5 and the nozzle 3 is set to form a motion trajectory; the positioning accuracy is used to improve the film forming accuracy; the load control speed is matched with the liquid film forming speed; and the stroke range is used to adapt to the requirements of large-area or multi-region liquid film preparation.

[0073] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flexible pen tip, characterized in that: The invention comprises an outlet flow channel (44) and a first driving mechanism (7). A first brush body (41) and a second brush body (42) are provided in the outlet flow channel (44). The first brush body (41) is provided with a plurality of first liquid supply holes (411) and short brushes (412). The second brush body (42) is provided with a plurality of second liquid supply holes (421) and long brushes (422). The second liquid supply holes (421) are connected to the inside of the outlet flow channel (44) through the first liquid supply holes (411). The second liquid supply holes (421) are located between adjacent short brushes (412) and long brushes (422). The plurality of long brushes (422) are respectively located between adjacent short brushes (412). The first driving mechanism (7) is used to drive the first brush body (41) to move back and forth relative to the second brush body (42), and drive the short brushes (412) and the long brushes (422) to swing back and forth.

2. The flexible pen tip according to claim 1, characterized in that: The long brush (422) and the short brush (412) are made of flexible material.

3. The flexible pen tip according to claim 1, characterized in that: An elastic support (43) is provided between the first brush body (41) and the outlet flow channel (44), and the first driving mechanism (7) includes an exciter connected to the first brush body (41).

4. The flexible pen tip according to claim 1, characterized in that: It comprises a plurality of groups of first brush bodies (41) and second brush bodies (42) detachably connected to an outlet flow channel (44).

5. A micron liquid film preparation device, characterized in that: The invention comprises a nozzle (3) and a collecting device (5), wherein the inlet of the nozzle (3) is connected to a liquid supply device (10), the outlet of the nozzle (3) is provided with a flexible pen tip (4) as described in any one of claims 1 to 4, and the long brush (422) and the short brush (412) are directed toward the collecting device (5).

6. The micron liquid film preparation device according to claim 5, characterized in that: The inlet of the nozzle (3) is connected to an air supply device (1).

7. The micron liquid film preparation device according to claim 6, characterized in that: The nozzle (3) is provided with an air cavity (2), a first buffer cavity (9) and a liquid supply channel (8) which are connected in sequence. The air cavity (2) is connected to the air supply device (1), the first buffer cavity (9) is connected to the liquid supply device (10), and the liquid supply channel (8) is connected to the outlet channel (44).

8. The micron liquid film preparation device according to claim 7, characterized in that: There are multiple liquid supply channels (8), and a second buffer cavity (11) is provided between the multiple liquid supply channels (8) and the outlet channel (44).

9. The micron liquid film preparation device according to claim 5, characterized in that: It comprises a second driving mechanism (6), which is used to drive the collecting device (5) to move relative to the nozzle (3), or the nozzle (3) to move relative to the collecting device (5) in three-dimensional directions.

10. A method for preparing a micron liquid film, characterized in that: The micron liquid film preparation device according to claim 5, wherein the preparation method comprises: The first driving mechanism (7) drives the first brush body (41) to move back and forth relative to the second brush body (42), driving the short brush (412) and the long brush (422) to swing back and forth; The liquid supply device (10) delivers the solution required for direct writing of the liquid film to the nozzle (3), so that the solution flows to the end of the long brush (422) through capillary action, forms a liquid cone and is directly written on the collecting device (5). The nozzle (3) and the collecting device (5) are controlled to move relative to each other, and finally the micron liquid film product is deposited.

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