Composite material, stylus tip, stylus tip assembly, stylus and molding method

Abstract

The present application relates to the technical field of touch control. Disclosed are a composite material, a stylus tip, a stylus tip assembly, a stylus and a molding method. The composite material at least comprises a mixture of fibers and a thermoplastic resin, wherein the fibers and the thermoplastic resin are bonded with each other to jointly form a first porous structure, a second porous structure is formed within the fibers, and the first porous structure and the second porous structure have resilience. The composite material provided by the present application can effectively improve the amplitude of writing, thereby generating rustling and a grainy sensation during the writing process; therefore, a user can feel the realistic texture similar to that felt when writing on paper.

Description

Composite material, stylus tip, stylus tip assembly, stylus and molding method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 27, 2023, with application number 202311289201.3 and application name “Composite material, stylus tip, stylus tip assembly, stylus and molding method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of touch technology, and in particular to a composite material, a stylus tip, a stylus tip assembly, a stylus, and a molding method. Background Art

[0003] With the widespread use of touch-enabled electronic devices such as mobile phones, computers, and drawing tablets in our daily lives and work, styluses have gradually become a mainstream method of human-computer interaction. Users can perform touch operations on touch devices by tapping or sliding the tip of the stylus on the touch screen of the touch device.

[0004] Currently, styluses on the market are mainly divided into electromagnetic and capacitive types. With a capacitive stylus, the tip of the stylus emits an electrical signal. When the capacitive stylus is brought close to the touchscreen, the electric field on the touchscreen is disturbed, causing the internal capacitance of the touchscreen to change. By measuring this capacitance change, the system can determine the position of the capacitive stylus on the touchscreen, enabling touch operations.

[0005] Capacitive styluses are popular due to their low cost and good compatibility. However, due to the limitations of current stylus tip materials, users struggle to experience the realistic texture of writing on paper when using them, and the writing experience needs to be improved.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, the present application provides a composite material, a stylus tip, a stylus tip assembly, a stylus and a molding method. The present application is introduced from multiple aspects below, and the implementation methods and beneficial effects of the following multiple aspects can be referenced with each other.

[0008] In a first aspect, the present application provides a composite material, which comprises at least a mixture of fibers and a thermoplastic resin, wherein the fibers and the thermoplastic resin are bonded to each other to form a first porous structure, and a second porous structure is formed inside the fibers, and the first porous structure and the second porous structure have resilience.

[0009] According to embodiments of the present application, when the composite material contacts and slides relative to another object (e.g., a touch screen described in the embodiments below), the first and second porous structures are subjected to stress. As the magnitude of the stress changes, the first and second porous structures compress and rebound, squeezing and releasing air within them. This causes significant vibration, causing particles within the first and second porous structures to collide and move with each other, producing a noticeable rustling sound and a grainy feel, thereby effectively enhancing the writing experience.

[0010] In a possible implementation of the first aspect, the fibers are conductive fibers that have been subjected to a conductive treatment, and / or the thermoplastic resin is a conductive thermoplastic resin that has been subjected to a conductive treatment, thereby enabling the composite material to be conductive.

[0011] In a possible implementation of the first aspect, the composite material further includes a mixture of conductive fillers, fibers, and thermoplastic resins, thereby further improving the conductive properties of the composite material.

[0012] In a possible implementation of the first aspect above, the conductive filler includes carbon, metal powder, or metal fiber.

[0013] In a possible implementation of the first aspect, the electrical conductivity of the composite material is 0.001 S / m to 1 S / m.

[0014] In a possible implementation of the first aspect, the fiber includes polyester fiber, terylene fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber, or glass fiber.

[0015] In a possible implementation of the first aspect, the thermoplastic resin includes a polyurethane resin, a polycarbonate resin, a polyoxymethylene resin, or a thermoplastic polyamide elastomer resin.

[0016] In a possible implementation of the first aspect, the weight of the fibers accounts for 40% to 70% of the total weight of the composite material, and the weight of the thermoplastic resin accounts for 20% to 50% of the total weight of the composite material.

[0017] In a possible implementation of the first aspect above, the weight of the fiber accounts for 10% to 30% of the total weight of the composite material, the weight of the thermoplastic resin accounts for 60% to 90% of the total weight of the composite material, and the weight of the conductive filler accounts for 2% to 10% of the total weight of the composite material.

[0018] A second aspect of the present application provides a stylus pen tip, wherein the material of the writing end of the stylus pen tip is any composite material of the first aspect and any possible implementation of the first aspect.

[0019] It should be understood that the beneficial effects of the second aspect mentioned above can be referred to the description of the first aspect mentioned above and will not be repeated here.

[0020] In a possible implementation of the second aspect, the stylus tip is made of a composite material that is conductive, which can further enhance the signal strength and stability of the stylus tip, thereby enhancing the writing linearity of the stylus tip.

[0021] A third aspect of the present application provides a stylus pen tip assembly, comprising a housing, and the stylus pen tip of the second aspect and any one of the possible implementations of the second aspect. The stylus pen tip comprises a head and a shaft connected along a first direction, the writing end being disposed at the head, and the shaft being inserted into the housing. The shaft comprises a first shaft segment, the first shaft segment being in contact with the inner wall of the housing, and the outer diameter of the first shaft segment gradually increasing from the first end toward the second end, with the first end being closer to the head than the second end.

[0022] According to the embodiments of the present application, since the writing end of the stylus tip is made of the aforementioned composite material, when the user writes with the stylus tip assembly, the first and second porous structures in the composite material repeatedly compress and rebound, effectively increasing the writing amplitude and producing a noticeable rustling sound and grainy feel. Furthermore, the inner wall of the housing mates with the first rod segment, effectively strengthening the connection between the stylus tip and the housing, thereby preventing the stylus tip from detaching from the housing and being damaged in the event of a drop, thereby improving its reliability and resistance to drops.

[0023] In a possible implementation of the third aspect, the stylus tip is mushroom-shaped, with the head forming a mushroom head and the stem forming a mushroom stem.

[0024] According to the embodiments of the present application, the mushroom-shaped head has a thicker wall, which provides better wear resistance, thereby increasing the service life of the stylus tip. Furthermore, the mushroom-shaped head is less likely to deform when dropped, further improving the drop resistance and reliability of the stylus tip.

[0025] In a possible implementation of the third aspect, the shell is made of injection molding material.

[0026] In a possible implementation of the third aspect, the material of the housing includes polycarbonate or acrylonitrile-butadiene-styrene copolymer.

[0027] A fourth aspect of the present application provides a stylus pen, which includes a pen body and a stylus pen tip assembly according to the third aspect and any one of the possible implementations of the third aspect, wherein the stylus pen tip assembly is connected to the pen body through a shell.

[0028] It should be understood that the beneficial effects of the fourth aspect mentioned above can be referred to the description of the first aspect mentioned above and will not be elaborated here.

[0029] A fifth aspect of the present application provides a method for forming a composite material, the method comprising:

[0030] obtaining fiber tows;

[0031] performing an impregnation treatment on the fiber tow to obtain a fiber tow having a surface coated with a thermoplastic resin;

[0032] The thermoplastic resin coated on the surface of the fiber tow is cured to obtain a composite material.

[0033] The composite material molding method described above, through impregnation, curing, and other processes, can produce a mixture of fibers and thermoplastic resin, thereby obtaining a composite material. The mutually bonded fibers and thermoplastic resin can jointly form a first porous structure with resilience, while the interior of the fibers can form a second porous structure with resilience. This allows the composite material to produce a noticeable rustling sound and graininess when rubbed against other objects (e.g., the touch screen described in the examples below). This method has simple steps and low molding difficulty.

[0034] In a possible implementation of the fifth aspect, the fiber tow is a conductive fiber tow that has been subjected to a conductive treatment, so that the prepared composite material is conductive.

[0035] In a possible implementation of the fifth aspect, the conductive processing includes:

[0036] The fiber tow is cleaned with alkali solution;

[0037] The cleaned fiber tow is soaked in metal salt water to attach metal ions to the surface of the fiber tow;

[0038] The metal ions attached to the surface of the fiber bundle are reduced to make the fiber bundle conductive.

[0039] In a possible implementation of the fifth aspect, the fiber tow is a fiber tow processed by a grinding gun.

[0040] According to the embodiment of the present application, the uniformity, surface quality and workability of the conductive fiber bundle can be further improved by preforming the fiber bundle with a grinding gun.

[0041] In a possible implementation of the fifth aspect, the fiber tow is subjected to an impregnation treatment, including:

[0042] mixing a thermoplastic resin and an ester mixed solvent to obtain a mixed solution;

[0043] The fiber bundle is impregnated with the mixed liquid.

[0044] According to the embodiments of the present application, the ester solvent can further improve the fluidity of the thermoplastic resin, thereby reducing the difficulty of the infiltration process and further improving the yield rate of the composite material.

[0045] A sixth aspect of the present application provides a method for forming a stylus pen tip assembly, for forming the stylus pen tip assembly according to the third aspect and any one of the possible implementations of the third aspect, the method comprising:

[0046] Get a stylus tip;

[0047] The stylus tip is placed in an injection mold, and the housing is molded by in-mold injection molding to obtain a stylus tip assembly.

[0048] The aforementioned stylus tip assembly molding method first uses a composite material to create the stylus tip, then uses in-mold injection molding to integrate the housing and stylus tip into a single piece. This allows the housing's shape to more closely match the stylus tip's profile, effectively reducing the clearance between the housing and the stylus tip. This improves the precision of the stylus tip assembly, further enhancing the accuracy of writing force and pressure, and reducing the wobble of the stylus tip assembly during writing. Furthermore, this molding method is simple, resulting in a low yield rate for the stylus tip assembly and excellent aesthetics.

[0049] In one possible implementation of the sixth aspect, the injection mold includes a front mold, a rear mold, a first insert, and a second insert. The first insert is disposed within the front mold and is positioned over the exterior of the stylus tip head. The second insert is positioned within the front and rear molds and is clamped to the stylus tip shaft. The front and rear mold cavities mate to form the exterior structure of the stylus tip housing, and the second insert mates with the stylus tip to form the interior structure of the stylus tip housing.

[0050] In a possible implementation of the sixth aspect above, the head of the stylus tip is interference fit with the inner wall of the first insert, and, along the first direction, the end face of the stylus tip is in contact with the end face of the shell, and the difference between the diameter of the end face of the stylus tip and the diameter of the end face of the shell is 0.1 mm to 0.3 mm, wherein the diameter of the end face of the stylus tip is larger than the diameter of the end face of the shell, and the first direction is the extension direction of the stylus tip.

[0051] Based on this, the radial tolerance of the stylus tip can be effectively reduced, ensuring that the stylus tip and the first insert can fit tightly, thereby achieving injection molding and sealing. The injection molding material will not overflow from the fitting gap between the stylus tip and the first insert to produce scratches, thereby further improving the aesthetics of the stylus tip assembly and preventing scratches.

[0052] In a possible implementation of the sixth aspect, an elastic pad is provided between the stem of the stylus tip and the second insert along a first direction, where the first direction is an extension direction of the stylus tip, thereby effectively reducing the axial tolerance of the stylus tip.

[0053] In one possible implementation of the sixth aspect, the housing includes a first connecting portion and a second connecting portion connected along a first direction, the first direction being the extension direction of the stylus tip, the first connecting portion being configured to connect to the stem of the stylus tip, the outer diameter of the first connecting portion of the housing gradually increasing from its first end toward its second end, the first end of the first connecting portion being further away from the second connecting portion than the second end, and an annular bone groove being defined on an end surface of the second end.

[0054] According to the embodiments of the present application, the outer diameter of the first connecting portion of the housing gradually increases from the first end to the second end, resulting in a smoother, more aesthetically pleasing, and refined stylus tip. Furthermore, the annular bone groove effectively reduces the thickness of the second end, thereby preventing shrinkage such as localized dents and voids at the second end during injection molding, further improving the housing's yield rate.

[0055] In one possible implementation of the sixth aspect, the injection mold's injection port is positioned within the annular bone groove. This prevents injection marks (e.g., spray marks and air marks) from being left on the surface of the stylus tip assembly, effectively enhancing the aesthetics and refinement of the stylus tip assembly.

[0056] In a possible implementation of the sixth aspect mentioned above, the shell includes a first connecting portion and a second connecting portion connected along a first direction, the second connecting portion of the shell is provided with an internal thread for screwing with the pen shaft, and a stop groove is provided on the outer peripheral surface of the second connecting portion of the shell.

[0057] According to the embodiments of the present application, the housing and the pen holder are detachably connected via a threaded connection, facilitating the replacement of the stylus tip assembly as needed. This threaded connection effectively strengthens the connection between the housing and the pen holder, further enhancing drop resistance. Furthermore, the anti-rotation groove prevents the housing from rotating with the second insert. This allows the second insert to be smoothly rotated out after the internal threads of the housing are formed, preventing damage to the housing during demolding and effectively improving the housing's yield rate.

[0058] In a possible implementation of the sixth aspect, the gap between the first insert and the front mold is used for exhaust.

[0059] This eliminates the need for additional venting slots in the front mold, resulting in a smooth, flawless surface finish for the finished stylus tip assembly, further enhancing its aesthetics. Furthermore, the gap between the first insert and the front mold ensures smooth glue flow after injection, preventing air trapping and glue shortages in complex structures or corners.

[0060] The seventh aspect of the present application provides a molding method for a stylus pen tip assembly, which is used to mold the stylus pen tip assembly of the third aspect and any one of the possible implementations of the third aspect. The method includes: molding the stylus pen tip and the nib shell in an injection mold by a double-shot injection molding process to obtain the stylus pen tip assembly.

[0061] The above-mentioned molding method of the stylus pen tip assembly can mold the stylus pen tip assembly in one step, effectively reducing the fitting clearance between the stylus pen tip and the housing, avoiding installation deviation caused by multiple injection molding assemblies, and improving molding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 shows an exemplary scene diagram of interaction between a stylus pen and an electronic device in an embodiment of the present application;

[0063] FIG2 shows a schematic structural diagram of a stylus in some technical solutions;

[0064] FIG3 shows a schematic structural diagram of a stylus in some other technical solutions;

[0065] FIG4A shows a micrograph of a composite material in an embodiment of the present application;

[0066] FIG4B shows a partial enlarged view of the composite material in the S1 region in FIG4A in an embodiment of the present application;

[0067] FIG5A shows a schematic structural diagram of a stylus pen according to an embodiment of the present application;

[0068] FIG5B shows a partial enlarged view of the stylus in the S2 area in FIG5A according to an embodiment of the present application;

[0069] FIG5C shows a cross-sectional view of the stylus pen at the area S2 in FIG5A taken along line AA according to an embodiment of the present application;

[0070] FIG6A shows a side view of a stylus tip assembly according to an embodiment of the present application;

[0071] FIG6B shows a cross-sectional view of the stylus tip assembly taken along line AA in FIG6A in an embodiment of the present application;

[0072] FIG7 shows a schematic structural diagram of a stylus tip according to an embodiment of the present application;

[0073] FIG8 shows a flow chart of a method for forming a composite material according to an embodiment of the present application;

[0074] FIG9 shows a flow chart of a method for forming a stylus pen tip according to an embodiment of the present application;

[0075] FIG10 is a flow chart showing a method for forming a stylus pen tip assembly according to an embodiment of the present application;

[0076] FIG11 is a schematic diagram showing a stylus pen tip assembly formed by in-mold injection molding in an injection mold according to an embodiment of the present application. DETAILED DESCRIPTION

[0077] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0078] The embodiments of the present application are used to provide a composite material that can be applied to the stylus tip of a stylus pen, effectively improving the writing experience. Before describing the technical solution of the present application, an exemplary application scenario of the present application is first introduced with reference to the accompanying drawings.

[0079] Figure 1 illustrates an exemplary scenario of interaction between a stylus 1 and an electronic device 2 in an embodiment of the present application. As shown in Figure 1 , electronic device 2 can be any electronic device capable of interacting with stylus 1. For example, electronic device 2 can be any touch-enabled electronic device, such as a mobile phone, tablet computer, laptop computer, drawing tablet, media player, wearable device, e-reader, or touch-sensitive television, though this application does not limit this. The following description uses a tablet computer as an example.

[0080] As shown in Figure 1, the stylus 1 may include a stylus tip assembly 01 and a pen body 02. The stylus tip assembly 01 includes a connected stylus tip 10 and a shell 20. The shell 20 is connected to one end of the pen body 02 to install the stylus tip assembly 01 on the pen body 02. The electronic device 2 includes a touch-sensitive display screen 201. The user can hold the pen body 02 of the stylus 1 with his hand and contact the stylus tip 10 of the stylus 1 with the display screen 201 to interact with the display screen 201. For example, the user can slide the stylus 1 on the display screen 201 to perform operations such as writing and drawing. For another example, the user can also click on an application icon (not shown) on the display screen 201 through the stylus 1 to start the corresponding application.

[0081] The following describes an exemplary structure of a stylus pen with reference to the accompanying drawings.

[0082] Figure 2 shows a schematic structural diagram of the stylus 1a in some technical solutions. Referring to Figure 2, the stylus tip assembly 01a of the stylus 1a includes a stylus tip 10a, a shell 20a and a conductive lead pin 30a. Among them, the stylus tip 10a is conductive plastic. The material of the shell 20a is insulating plastic. The stylus tip 10a is arranged inside the shell 20a. And is connected to one end of the conductive lead pin 30a. The other end of the conductive lead pin 30a is used to connect to the radio frequency circuit (not shown) inside the stylus 1a. The stylus tip assembly 01a may also include an elastic pen head (not shown). One end of the elastic pen head is connected to the stylus tip 10a, and the other end is located on the outside of the shell 20a.

[0083] In the above-mentioned stylus pen 1a, the stylus tip 10a and the shell 20a of the stylus pen 1a are both made of plastic, which is relatively smooth and has a small contact area with the touch screen. When using the stylus pen 1a to write, no obvious rustling sound or graininess will be produced, and it is difficult for users to feel the realistic texture similar to writing on paper.

[0084] FIG3 shows a schematic structural diagram of a stylus 1b in some other technical solutions. Referring to FIG3 , the stylus tip 10b of the stylus 1b is made of insulating fiber. A top cover 03b is provided on the top of the pen body 02b. The top cover 03b seals the top of the pen body 02b. An elastic member 04b, a pressure block 05b, and a cotton tube 06b are provided inside the pen body 02b. The top of the elastic member 04b is connected to the top cover 03b, and the bottom is fixedly connected to the pressure block 05b. The bottom of the pressure block 05b is movably connected to the top of the cotton tube 06b. The outer surface of the cotton tube 06b is a plastic film, and the interior is filled with cotton. Conductive liquid can be stored in the cotton. The bottom of the cotton tube 06b is connected to the stylus tip 10b. During use, the user needs to apply a large amount of pressure to the stylus 1b so that the conductive liquid in the cotton tube 06b can fully soak the stylus tip 10b, thereby achieving touch operation.

[0085] In the stylus pen 1b, the stylus tip 10b of the stylus pen tip 1b is made of relatively soft fiber. Therefore, when the stylus pen tip 10b contacts the touch screen, it is also difficult to produce obvious rustling sound and grainy feeling.

[0086] In summary, due to the limitations of the stylus tip material, users cannot produce a noticeable rustling sound or grainy feeling when using the stylus for writing and other operations. As a result, users cannot feel the realistic texture similar to paper, and the accuracy and fluency of writing are poor.

[0087] The composite material provided in the embodiments of the present application is used to improve the aforementioned issues. In the embodiments of the present application, the composite material includes a porous structure (e.g., the first porous structure 130 and the second porous structure 140 described below). When the composite material is applied to the stylus tip 10 of the stylus pen 1, the porous structure of the composite material can effectively increase the writing amplitude of the stylus tip 10, thereby making the rustling sound and graininess more pronounced, making writing more realistic and natural, helping users better control writing speed and force, and improving writing accuracy and comfort.

[0088] The technical solution of this application is described in detail below with reference to the accompanying drawings.

[0089] Figure 4A shows a micrograph of composite material 100 according to an embodiment of the present application. Figure 4B shows a partial magnified view of region S1 of composite material 100 according to an embodiment of the present application. Referring to Figures 4A and 4B , composite material 100 includes at least a mixture of fibers 110 and thermoplastic resin 120.

[0090] The fibers 110 and thermoplastic resin 120 are bonded to each other. That is, the contact surfaces of the fibers 110 and thermoplastic resin 120 exhibit adhesion, thereby integrating the fibers 110 and thermoplastic resin 120 into a single entity. The bonded fibers 110 and thermoplastic resin 120 together form a first porous structure 130. The first porous structure 130 includes a plurality of pores G1 formed between adjacent fibers 110 and thermoplastic resin 120.

[0091] 4B , the fiber 110 includes a plurality of fine fiber filaments 111 . The interior of the fiber 110 can form a second porous structure 140 that is compressible and resilient. The second porous structure 140 includes a plurality of pores G2 formed between adjacent fiber filaments 111 .

[0092] The first porous structure 130 and the second porous structure 140 are both resilient. In other words, the first porous structure 130 and the second porous structure 140 will deform under the action of an external force, and when the external force is removed, the first porous structure 130 and the second porous structure 140 can quickly return to their original shape.

[0093] When the composite material 100 contacts and slides relative to a touch screen (e.g., the display screen 201 described above), stress is applied to the first porous structure 130 and the second porous structure 140. As the magnitude of the stress changes, the pores G1 of the first porous structure 130 and the pores G2 of the second porous structure 140 compress and rebound, squeezing and releasing the air within pores G1 and G2. This causes significant vibration, causing particles within the first and second porous structures 130 and 140 to collide and move with each other, producing a noticeable rustling sound and a grainy feel, thereby effectively enhancing the writing experience.

[0094] In some embodiments of the present application, the weight of the fiber 110 may account for 40% to 70% of the total weight of the composite material 100 , and the weight of the thermoplastic resin 120 may account for 20% to 50% of the total weight of the composite material 100 .

[0095] In some embodiments of the present application, the porosity of the first porous structure 130 may be 5-10%.

[0096] In some embodiments of the present application, the porosity of the second porous structure 140 may be 5-30%.

[0097] In some embodiments of the present application, the composite material 100 has conductive properties, thereby effectively enhancing the signal strength of the stylus tip 10 and improving the writing linearity of the stylus tip 10. For example, the fibers 110 of the composite material 100 may be conductive fibers that have undergone a conductive treatment to enable the composite material 100 to be conductive. For another example, the thermoplastic resin 120 of the composite material 100 may be a conductive thermoplastic resin that has undergone a conductive treatment to enable the composite material 100 to be conductive.

[0098] Furthermore, the composite material 100 may also include a mixture of conductive fillers (e.g., carbon, metal powder, or metal fibers), fibers 110, and thermoplastic resin 120. The conductive fillers can further enhance the conductivity of the composite material 100, thereby effectively increasing the signal strength of the stylus tip 10 and improving the writing linearity of the stylus tip 10.

[0099] For example, the weight of the fiber 110 may account for 10% to 30% of the total weight of the composite material 100, the weight of the thermoplastic resin 120 may account for 60% to 90% of the total weight of the composite material 100, and the weight of the conductive filler may account for 2% to 10% of the total weight of the composite material 100.

[0100] In some embodiments of the present application, the electrical conductivity of the composite material 100 is 0.001S / m to 1S / m, for example, 0.001S / m, 0.002S / m, 0.003S / m, etc., to ensure that it can meet the writing requirements in various application scenarios.

[0101] In some embodiments of the present application, the fiber 110 includes polyester fiber, terylene fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber, or glass fiber.

[0102] In some embodiments of the present application, the thermoplastic resin 120 includes a polyurethane resin (e.g., thermoplastic polyurethanes (TPU)), a polycarbonate resin (e.g., polycarbonate (PC)), a polyoxymethylene resin (e.g., polyformaldehyde (POM)) or a thermoplastic polyamide elastomer resin (e.g., thermoplastic polyamide elastomer (TPAE)).

[0103] In some implementations, the thermoplastic resin 120 can be a polyurethane resin. Polyurethane resins contain alternating soft segments (flexible long chains of oligomer polyols) and hard segments (diisocyanates and chain extenders), as well as hydrogen bonds within the polyurethane groups, resulting in strong intermolecular forces. Therefore, after curing, polyurethane resins exhibit excellent wear resistance and toughness, further enhancing the durability of the composite material 100.

[0104] The present application also provides a stylus tip, a stylus tip assembly, and a stylus including the stylus tip. The writing end of the stylus tip provided herein (i.e., the end that contacts the touch screen when writing) is made of the composite material 100 described above, effectively increasing the writing amplitude, thereby enhancing the rustling sound and graininess of writing, and improving the user experience. This is described in detail below with reference to the accompanying drawings.

[0105] Figures 5A to 5C illustrate the structure of a stylus pen 1 according to an embodiment of the present application. Figure 5B shows a partially enlarged view of the stylus pen 1 in the S2 region in Figure 5A, with the internal structure of the stylus pen 1 indicated by dashed lines. Figure 5C shows a cross-sectional view of the stylus pen 1 taken along line AA in the S2 region in Figure 5A. In conjunction with Figures 5A to 5C, the stylus pen 1 includes a stylus tip assembly 01 and a pen holder 02.

[0106] The stylus tip assembly 01 includes a stylus tip 10 and a shell 20. The stylus tip 10 includes a head 11 and a rod 12. The head 11 and the rod 12 are connected along the X direction (as a first direction). The head 11 is provided with a writing end 111. The material of the writing end 111 is a composite material 100. The shell 20 includes a first connecting portion 21 and a second connecting portion 22 arranged opposite to each other along the X direction. The first connecting portion 21 of the shell 20 is sleeved on the outside of the rod 12 of the stylus tip 10. The second connecting portion 22 of the shell 20 is connected to the pen body 02.

[0107] The pen holder 02 extends along the X direction. The pen holder 02 can be a cylindrical structure or a hollow tubular structure of any other shape, for example, the cross section of the hollow tubular structure is a square, hexagonal, octagonal, or irregular polygonal shape, etc., which is not limited in this application.

[0108] In some embodiments of the present application, a pressure-sensing module 03 may be installed inside the pen body 02. This module interfaces with the stylus tip 10 to accurately measure the force applied by the user to the stylus 1, thereby further improving writing accuracy. In other embodiments, the pen body 02 may also include other components, such as buttons, input / output components (USB port), or a cap, though this application does not impose any limitations on these components.

[0109] Since the material of the writing end 111 of the stylus tip 10 is made of the above-mentioned composite material 100, when the user uses the stylus 1 to write, the first porous structure 130 and the second porous structure 140 in the composite material 100 will repeatedly produce compression and rebound, thereby effectively increasing the writing amplitude, thereby producing a noticeable rustling sound and granularity. The specific principle of the composite material 100 producing rustling sound and granularity can refer to the above-mentioned Figures 4A and 4B and their related descriptions, which will not be repeated here. Secondly, the first porous structure 130 and the second porous structure 140 make the surface of the composite material 100 have a concave and convex irregular structure, which can effectively increase the contact area between the stylus tip 10 and the touch screen, thereby increasing the friction between the porous mesh structure 130 and the touch screen, increasing the writing amplitude, and thus enhancing the granularity and rustling sound. This rustling sound and granularity can give users an experience that is closer to writing with paper and pen, making writing more real and natural. Moreover, this sound and touch can also help users better control writing speed, writing strength, and pen stroke changes, thereby improving writing accuracy and fluency.

[0110] In addition, the composite material 100 has a certain degree of flexibility. When the stylus pen 1 falls, the composite material 100 can produce deformation buffering, effectively absorbing the impact energy generated by the fall, avoiding damage to the internal components of the stylus pen 1 (for example, the pressure sensing module 03), and effectively improving the drop resistance reliability of the stylus pen 1.

[0111] In some embodiments of the present application, all parts of the stylus tip 10 can be made of the composite material 100 described above. The composite material 100 is conductive. In other words, the conductive composite material 100 can be used to create a conductive stylus tip 10. This allows the conductive portion of the stylus tip 10 to directly contact a touch screen (e.g., the display screen 201 described above), further enhancing the signal strength and stability of the stylus 1 and, in turn, the linearity of the stylus 1's writing.

[0112] For example, as shown in FIG2 , since the insulating shell 20a and the elastic pen tip are both wrapped around the outside of the conductive stylus tip 10a, when the stylus 1a is used to write, the stylus tip 10a will not be in direct contact with the touch screen. The stylus tip 10a will generate a certain signal loss when transmitting the capacitive signal. As shown in FIG3 , when the user holds the stylus 1b and writes, the pressure applied to the stylus 1b will change, resulting in different degrees of infiltration of the conductive liquid into the stylus tip 10b, which in turn causes the signal of the stylus 1b to fluctuate greatly. In the embodiment of the present application, the material of the stylus tip 10 of the stylus 1 is a conductive composite material 100. The conductive part of the stylus tip 10 can be in direct contact with the touch screen, and there is no insulating layer to hinder the transmission of the signal. Therefore, compared with the stylus 1a shown in FIG2 and the stylus 1b shown in FIG3 , the signal strength and stability of the stylus 1 provided by the present application are better.

[0113] Furthermore, the stylus tip 1b shown in FIG3 requires an elastic member 04b, a pressure block 05b, and a cotton tube 06b to achieve electrical conductivity, resulting in a complex structure and increased assembly difficulty. In contrast, the stylus tip 10 in this application can be made of a conductive composite material 100, which is inherently conductive. Therefore, no additional components are required within the stylus 1 to facilitate electrical conductivity. The stylus 1 has a simpler structure and is less difficult to assemble.

[0114] The specific structure and connection method of each component of the touch pen 1 will be further described below with reference to the accompanying drawings.

[0115] Figures 6A and 6B illustrate schematic diagrams of the structure of a stylus tip assembly 01 according to an embodiment of the present application, wherein Figure 6A is a side view of the stylus tip assembly 01, and Figure 6B is a cross-sectional view of the stylus tip assembly 01 taken along line AA in Figure 6A. Figure 7 illustrates a schematic diagram of the structure of a stylus tip 10 according to an embodiment of the present application.

[0116] 6A to 7 , the stem 12 of the stylus tip 10 includes a first stem segment 121. The outer diameter of the first stem segment 121 gradually increases from the first end 1211 to the second end 1212. The first end 1211 of the first stem segment 121 is closer to the head 11 than the second end 1212 of the first stem segment 121. The shape of the inner wall 23 of the housing 20 matches the shape of the first stem segment 121, so that the first stem segment 121 fits snugly against the inner wall 23. This effectively strengthens the connection between the stylus tip 10 and the housing 20, preventing the stylus tip 10 from detaching from the housing 20 and being damaged in the event of a fall, thereby improving its drop resistance.

[0117] In some embodiments of the present application, the stylus tip 10 is mushroom-shaped. Specifically, the head 11 of the stylus tip 10 is formed into a mushroom head, and the stem 12 is formed into a mushroom stem. Because the mushroom-shaped head 11 has a thicker wall, it offers improved wear resistance, thereby extending the lifespan of the stylus tip 10. Furthermore, the mushroom-shaped head 11 is less likely to deform when dropped, further enhancing the stylus tip 10's drop resistance and reliability.

[0118] Compared to the solution shown in Figure 2 above, which uses a housing 20a to enclose the stylus tip 10a, the thickness of the housing 20a is limited due to the need to ensure that the stylus tip 10a can transmit a certain signal strength. Consequently, the housing 20a is prone to deformation after long-term use or after being dropped, and its wear resistance is also poor. However, the present invention, by designing the stylus tip 10 into a mushroom shape, effectively improves wear resistance and drop resistance reliability.

[0119] Continuing with Figures 6B and 7 , in some embodiments of the present application, along the X-direction, the end surface 13 of the stylus tip 10 mates with the end surface 24 of the housing 20. The difference between the diameters of the end surface 13 and the end surface 24 is 0.1 mm to 0.3 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, etc. Furthermore, the diameter of the end surface 13 is larger than the diameter of the end surface 24. This helps prevent scratches during the molding process of the stylus tip assembly 01, further improving the aesthetics of the stylus tip assembly 01 and preventing scratches.

[0120] In some embodiments of the present application, the outer diameter of the first connecting portion 21 of the housing 20 gradually increases from the first end 211 to the second end 212, so as to make the stylus tip 1 more streamlined, more beautiful, and more refined. Specifically, the first end 211 of the first connecting portion 21 is farther away from the second connecting portion 22 than the second end 212.

[0121] In order to avoid shrinkage (such as local depression, cavity, etc.) caused by excessive wall thickness of the second end 212 of the first connecting portion 21 during the molding process of the shell 20, in some embodiments of the present application, an annular bone groove 213 can be opened on the end surface 2121 of the second end 212.

[0122] In some embodiments of the present application, the stylus tip assembly 01 and the pen body 02 are detachably connected, so that the stylus tip assembly 01 can be replaced at any time according to actual needs. For example, referring to Figure 6B and in combination with Figures 5B and 5C, the second connecting portion 22 of the shell 20 is provided with an internal thread 221. The pen body 02 is provided with an external thread 04. The internal thread 221 and the external thread 04 are screwed together, so that the shell 20 is connected to the pen body 02. In this way, the stylus tip assembly 01 can be removed from the pen body 02 by rotating the shell 20 for easy replacement. In addition, the internal thread 221 and the external thread 04 are screwed together to effectively enhance the connection strength between the shell 20 and the pen body 02, so that the stylus 1 is not easy to break, and the drop reliability of the stylus 1 is further improved.

[0123] In order to prevent the shell 20 from being unable to escape from the thread core (for example, the second insert 34 described below) during the process of forming the internal thread 221, in some embodiments of the present application, a stop groove 222 can be opened on the outer peripheral surface of the second connecting portion 22 of the shell 20.

[0124] In some embodiments of the present application, the housing 20 is made of an injection molding material. That is, the housing 20 can be formed by injection molding. The injection molding material can be polycarbonate or acrylonitrile-butadiene-styrene copolymer (ABS).

[0125] After introducing the specific structures of the components and materials in the stylus pen 1 , the following will continue to introduce the molding methods of the components and materials in the stylus pen 1 .

[0126] The present application provides a molding method for a composite material 100 , which is described below.

[0127] FIG8 shows a flow chart of a method for forming a composite material 100 in an embodiment of the present application. Referring to FIG8 , the forming method specifically includes the following steps:

[0128] S110: Obtaining a fiber tow.

[0129] In some embodiments of the present application, the fiber 110 may be stretched and spun by a spinning process to obtain a fiber tow, wherein the fiber 110 may include polyester fiber, terylene fiber, acrylic fiber or nylon fiber.

[0130] S120: performing an impregnation treatment on the fiber bundle to obtain a fiber bundle having a surface coated with a thermoplastic resin.

[0131] In some embodiments of the present application, the thermoplastic resin 120 may be first mixed with an ester solvent to obtain a mixture of the thermoplastic resin 120 and the ester solvent. The fiber tow may then be pre-impregnated with the mixture of the thermoplastic resin 120 and the ester solvent, and the flowing mixture of the thermoplastic resin 120 and the ester solvent may then be impregnated into the fiber tow. The ester solvent may further enhance the fluidity of the thermoplastic resin 120, thereby reducing the difficulty of the impregnation process and thereby improving the yield rate of the composite material 100.

[0132] In some embodiments of the present application, the thermoplastic resin 120 may be a polyurethane resin, a polycarbonate resin, a polyoxymethylene resin, or a thermoplastic polyamide elastomer resin.

[0133] In some implementations, the thermoplastic resin 120 may be a polyurethane resin. Polyurethane resins contain alternating soft segments (flexible long chains of oligomer polyols) and hard segments (diisocyanate and chain extender), as well as hydrogen bonds within the polyurethane groups. This creates strong intermolecular forces and, after curing, exhibits excellent wear resistance and toughness, further enhancing the durability of the composite material.

[0134] S130: Curing the thermoplastic resin coated on the surface of the fiber tow to obtain a composite material.

[0135] According to the above steps, the fiber bundle coated with the thermoplastic resin 120 can be placed in a heating furnace to be heated to volatilize the ester solvent, thereby drying and curing the thermoplastic resin 120, thereby obtaining a composite material 100 with appropriate hardness.

[0136] The molding method of the composite material 100 can obtain a mixture of fibers 110 and thermoplastic resin 120 through treatments such as impregnation and curing, thereby obtaining the composite material 100. Among them, the mutually bonded fibers 110 and thermoplastic resin 120 can jointly form a first porous structure with resilience (for example, the first porous structure 110 shown in FIG4A ), and the interior of the fibers 110 can form a second porous structure with resilience (for example, the second porous structure 120 shown in FIG4B ), so that the composite material 100 can produce a noticeable rustling sound and grainy feeling when rubbed against the touch screen. This method has simple steps and low molding difficulty.

[0137] In some embodiments of the present application, the fiber bundles may be conductive fiber bundles that have been subjected to a conductive treatment, so that the prepared composite material 100 can be conductive.

[0138] For example, the conductive treatment may include: first, cleaning the fiber tow with an alkaline solution. Then, soaking the cleaned fiber tow in a metal salt solution to allow metal ions to adhere to the surface of the fiber tow. Finally, reducing the metal ions attached to the surface of the fiber tow, thereby making the fiber tow conductive, thereby obtaining the conductive composite material 100.

[0139] In some implementations, the metal ions attached to the surface of the fiber tow can be reduced by physical vapor deposition (PVD) to further improve the conductive properties of the fiber tow.

[0140] In some implementations, the metal brine may be a copper sulfate-based metal brine, a nickel sulfate-based metal brine, or a copper chloride-based metal brine. Accordingly, the metal ion may be a copper-containing metal ion or a nickel-containing metal ion.

[0141] In some embodiments of the present application, the fiber tows may be preformed using a grinding gun to further improve the uniformity, surface quality, and workability of the conductive fiber tows. For example, after the conductive treatment, the fiber tows may be preformed using a grinding gun to eliminate surface defects (e.g., uneven large protrusions and depressions) resulting from the conductive treatment, thereby facilitating subsequent processing to obtain the composite material 100 and further improving the yield rate of the composite material 100.

[0142] Based on the molding method of the composite material 100 provided in the present application, the present application also provides a molding method of the stylus pen tip 10 , which is introduced below.

[0143] FIG9 shows a flow chart of a method for forming a stylus pen tip 10 according to an embodiment of the present application. Referring to FIG9 , the forming method specifically includes the following steps:

[0144] S210: Obtaining a conductive composite material.

[0145] The specific method for obtaining the conductive composite material 100 may refer to the aforementioned method for forming the conductive composite material 100 , and will not be described in detail here.

[0146] S220: trimming the conductive composite material to obtain a stylus tip.

[0147] In some embodiments of the present application, the conductive composite material 100 can be cut, ground, or otherwise processed into a desired shape (e.g., the mushroom shape shown in FIG. 7 ) according to actual needs, thereby obtaining a stylus tip 10 .

[0148] The above-described stylus tip forming method can produce a stylus tip 10 by appropriately trimming a conductive composite material 100. Because the conductive composite material 100 includes a porous structure (e.g., the first porous structure 130 and the second porous structure 140 shown in Figures 4A and 4B ), writing with the stylus tip 10 produces a noticeable rustling sound and a grainy feel, effectively enhancing the user's writing experience. This method is simple and has low molding difficulty.

[0149] Based on the molding method of the composite material 100 and the molding method of the stylus pen tip 10 provided in the present application, the present application also provides a molding method of the stylus pen tip assembly 01, which is introduced below.

[0150] FIG10 shows a flow chart of a molding method of the stylus pen tip assembly 01 in an embodiment of the present application. Referring to FIG10 , the molding method specifically includes the following steps:

[0151] S310: Obtaining a stylus tip.

[0152] The specific method of obtaining the stylus tip 10 may refer to the aforementioned steps S210 and S220 and will not be described in detail here.

[0153] S320: placing the stylus tip into an injection mold, and molding a housing by in-mold injection molding to obtain a stylus tip assembly.

[0154] 11 shows a schematic diagram of an embodiment of the present invention wherein the stylus tip assembly 01 is formed by in-mold injection molding in an injection mold 3. Referring to FIG11 , the injection mold 3 includes a front mold 31, a back mold 32, a first insert 33, and a second insert 34.

[0155] The first insert 33 is disposed in the front mold 31 and is sleeved on the outside of the head 11 of the stylus tip 10. The second insert 34 is inserted into the rear mold 32 and the front mold 31 and is clamped on the shaft 12 of the stylus tip 10.

[0156] The front mold cavity 311 of the front mold 31 and the rear mold cavity 321 of the rear mold 32 can form the external structure of the housing 20 . The second insert 34 and the stylus tip 10 can form the internal structure of the housing 20 .

[0157] The injection molding material used to form the shell 20 is heated until it is completely melted, and then the completely melted injection molding material is injected into the cavity of the injection mold 3 using high pressure. After cooling and shaping, the shell 20 is formed, thereby obtaining the stylus tip assembly 01.

[0158] The aforementioned molding method for the stylus tip assembly 01 first produces the stylus tip 10, then integrally molds the housing 20 and stylus tip 10 through in-mold injection molding. This allows the shape of the housing 20 to better match the shape of the stylus tip 10, effectively reducing the clearance between the housing 20 and the stylus tip 10. This improves the precision of the stylus tip assembly 01, thereby increasing the accuracy of writing force and pressure, and reducing the wobble of the stylus tip assembly 01 during writing. Furthermore, this molding method is simple, resulting in a low yield rate for the stylus tip assembly 01 and a superior aesthetic appearance.

[0159] For example, in the stylus tip assembly 01b shown in FIG3 , the stylus tip 10b and the pen body 02b are formed separately, and the stylus tip 10b is formed by grinding, resulting in poor molding precision. The stylus tip 10b is installed on the pen body 02b by plugging and unplugging, and there is an installation error between the pen body 02b and the stylus tip 10b, resulting in low matching precision. This results in the stylus tip assembly 01b being unable to accurately transmit writing force and pressure, resulting in a strong sense of shaking when writing, and a low degree of refinement in appearance. In the present application, the stylus tip 10 and the housing 20 are integrally molded by in-mold injection molding. The housing 20 can fit more tightly with the stylus tip 10, effectively avoiding installation errors caused by poor grinding molding precision, improving matching precision, and eliminating the sense of shaking when writing, and being able to accurately transmit writing force and pressure. At the same time, the integrated stylus tip 10 and housing 20 are also more aesthetically pleasing.

[0160] The structure of the injection mold 3 will be described in detail below with reference to the accompanying drawings.

[0161] Continuing with reference to Figure 11 in conjunction with Figures 6B and 7 , in some embodiments of the present application, along the X-direction, the end surface 13 of the stylus tip 10 abuts against the end surface 24 of the housing 20. The difference between the diameters of the end surface 13 and the end surface 24 is 0.1 mm to 0.3 mm, with the diameter of the end surface 13 being greater than the diameter of the end surface 24. Furthermore, the head 11 of the stylus tip 10 forms an interference fit with the inner wall 331 of the first insert 33.

[0162] Based on this, the radial tolerance of the stylus tip 10 can be effectively reduced, ensuring that the stylus tip 10 and the first insert 33 can fit tightly, thereby realizing injection molding and sealing. The injection molding material will not overflow from the fitting gap between the stylus tip 10 and the first insert 33 to produce scratches, thereby further improving the aesthetics of the stylus tip assembly 01 and preventing scratches.

[0163] In some embodiments of the present application, an elastic pad 35 is provided between the stem 12 of the stylus tip 10 and the second insert 34 , thereby effectively reducing the axial tolerance of the stylus tip 10 .

[0164] Continuing with reference to FIG. 11 and in conjunction with FIG. 6B , in some embodiments of the present application, an annular groove 213 may be formed on the end surface 2121 of the second end 212 of the housing 20. The annular groove 213 can effectively reduce the thickness of the second end 212, thereby preventing shrinkage such as localized depressions or cavities in the second end 212 during injection molding, thereby further improving the yield rate of the housing 20.

[0165] In some embodiments of the present application, the glue inlet can be opened in the annular bone groove 213, so as to avoid leaving injection marks (for example, spray marks and air marks caused by injection) on the surface of the stylus tip assembly 01, thereby effectively improving the beauty and refinement of the appearance of the stylus tip assembly 01.

[0166] In some embodiments of the present application, a locking groove 222 may be formed on the outer circumference of the second connecting portion 22 of the housing 20. The locking groove 222 prevents the housing 20 from rotating with the rotation of the second insert 34. This allows the second insert 34 to be smoothly rotated out after the internal threads 221 of the housing 20 are formed, preventing damage to the housing 20 during the demolding process and effectively improving the yield rate of the housing 20.

[0167] Continuing with Figure 11 , in some embodiments of the present application, the gap G3 between the first insert 33 and the front mold 31 can be used for air venting. This eliminates the need for additional venting slots in the front mold 31, resulting in a smooth, flawless surface finish for the finished stylus tip assembly 01 and further enhancing its aesthetic appeal. Furthermore, the gap G3 ensures smooth glue flow after glue injection, preventing air entrapment and glue shortages in complex structures or corners (e.g., area S3 in Figure 11 ).

[0168] In some other embodiments of the present application, the composite material 100 may also be formed by injection molding.

[0169] For example, the fiber 110 and the thermoplastic resin 120 may be mixed to obtain an injection molding material for making the composite material 100 , and then the injection molding material for making the composite material 100 may be injected into an injection mold by an injection molding machine, and the composite material 100 may be obtained after cooling and shaping.

[0170] The fiber 110 may be made of carbon fiber, aramid fiber, or glass fiber. The thermoplastic resin 120 may be made of polyurethane resin, polycarbonate resin, polyoxymethylene resin, or thermoplastic polyamide elastomer resin.

[0171] In some embodiments of the present application, the thermoplastic resin 120 may be a conductive thermoplastic resin that has been subjected to a conductive treatment, thereby enabling the resulting composite material 100 to be conductive. For example, the molten thermoplastic resin 120 may be filled with a conductive filler (e.g., carbon, metal powder, or metal fiber) to enable the thermoplastic resin 120 to be conductive.

[0172] In order to further enhance the conductive properties of the composite material 100, in some implementations, the fiber 110, the thermoplastic resin 120 and the conductive filler (for example, carbon, metal powder or metal fiber) can be mixed to obtain an injection molding material for making the composite material 100, and then the injection molding material for making the composite material 100 is injected into the injection mold through an injection molding machine, and the conductive composite material 100 is obtained after cooling and shaping.

[0173] Based on the molding method of the composite material 100 , in some embodiments of the present application, the stylus tip 10 and the housing 20 may also be molded by injection molding to obtain the stylus tip assembly 01 .

[0174] For example, the injection molding material for the stylus tip 10 and the injection molding material for the housing 20 can be mixed first, and then the two injection molding materials are respectively injected into the cavities of an injection mold (such as the injection mold 3 described above) using a double-shot injection molding machine. After cooling and finalizing, the stylus tip assembly 01 is obtained. The injection molding material used to make the stylus tip 10 is the same as the injection molding material used to make the conductive composite material 100 described above, and will not be described in detail here.

[0175] The molding method of the stylus pen tip assembly 01 described above can mold the stylus pen tip assembly 01 in one step, thereby effectively reducing the fitting clearance between the stylus pen tip 10 and the housing 20, improving the molding accuracy, and achieving a high yield rate for the stylus pen tip assembly 01. For example, in the stylus pen tip assembly 01a shown in FIG2 above, the stylus pen tip 10a and the conductive lead 30a are molded into one piece by an in-mold injection molding process, and then molded into one piece with the housing 20a, and then the elastic member is connected to the stylus pen tip 10a by adhesive or hot melt, ultimately obtaining the stylus pen tip assembly 01a. The molding steps of the stylus pen tip assembly 01a are cumbersome and complex, and the molding accuracy is unstable, resulting in a low yield rate for the stylus pen tip assembly 01a. In the present application, the stylus pen tip assembly 01 can be molded in one step by the molding method described above, thereby effectively avoiding the installation deviation caused by multiple injection molding assemblies, achieving higher molding accuracy and yield rate, and simplifying the steps.

[0176] In some embodiments of the present application, the molding shrinkage of the injection molding material used to make the housing 20 is similar to that of the injection molding material used to make the stylus tip 10, thereby further improving molding accuracy, making the stylus tip assembly 01 smoother in appearance, and reducing the need for subsequent processing and finishing. For example, the injection molding material used to make the housing 20 can be polycarbonate or acrylonitrile-butadiene-styrene copolymer.

[0177] In some embodiments of the present application, when the injection molding material used to make the housing 20 may be polycarbonate or acrylonitrile-butadiene-styrene copolymer, the thermoplastic resin 120 in the injection molding material used to make the stylus tip 10 may be thermoplastic polyurethane. The polarity of thermoplastic polyurethane is similar to that of polycarbonate or acrylonitrile-butadiene-styrene copolymer. Therefore, thermoplastic polyurethane and polycarbonate or acrylonitrile-butadiene-styrene copolymer can achieve compatibility, permeability, and penetration in the molten state, forming bonds at the molecular chain level, thereby improving adhesion and further enhancing the connection strength between the stylus tip assembly 10 and the housing 20.

[0178] The above is an introduction to the technical solution of this embodiment. It should be noted that this embodiment is an exemplary introduction to the technical solution of this application, and those skilled in the art may make other modifications.

[0179] For example, in this embodiment, double-shot injection molding is performed in an injection mold to obtain an integrally formed stylus tip assembly 01, but the present application is not limited thereto.

[0180] In other embodiments, the stylus tip 10 may be first injection-molded in an injection mold, and then the housing 20 may be injection-molded in the injection mold by in-mold injection molding to obtain the stylus tip assembly 01. The injection molding material used to make the stylus tip 10 is the same as the injection molding material used to make the conductive composite material 100 described above, and the injection molding material used to make the housing 20 is the same as the injection molding material used to make the housing 20 in the double-shot injection molding process described above, and their details are not repeated here.

[0181] In some other embodiments, the stylus tip 10 may be separately injection molded in an injection mold. The injection molding material used to make the stylus tip 10 is the same as the injection molding material used to make the conductive composite material 100, and will not be described in detail here.

[0182] The above describes the implementation methods of the present application by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation methods. On the contrary, the purpose of introducing the application in conjunction with the implementation methods is to cover other options or modifications that may be extended based on the claims of the present application. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details are omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other unless there is a conflict.

[0183] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "outside", "inside", "circumferential", "radial", "axial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0184] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "dispose," "install," "connect," and "fit" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0185] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A composite material, characterized in that: The composite material at least includes a mixture of fibers and thermoplastic resin, the fibers and the thermoplastic resin are bonded to each other to form a first porous structure, a second porous structure is formed inside the fibers, and the first porous structure and the second porous structure have resilience.

2. The composite material according to claim 1, characterized in that The fiber is a conductive fiber that has been subjected to a conductive treatment, and / or the thermoplastic resin is a conductive thermoplastic resin that has been subjected to a conductive treatment.

3. The composite material according to claim 2, characterized in that The composite material also includes a mixture of conductive fillers, fibers and thermoplastic resin.

4. The composite material according to claim 3, characterized in that The conductive filler includes carbon, metal powder or metal fiber.

5. The composite material according to any one of claims 2 to 4, characterized in that: The electrical conductivity of the composite material is 0.001 S / m to 1 S / m.

6. The composite material according to claim 1, characterized in that The fibers include polyester fibers, terylene fibers, acrylic fibers, nylon fibers, carbon fibers, aramid fibers or glass fibers.

7. The composite material according to claim 1, characterized in that The thermoplastic resin includes polyurethane resin, polycarbonate resin, polyoxymethylene resin or thermoplastic polyamide elastomer resin.

8. The composite material according to claim 1, characterized in that The weight of the fiber accounts for 40% to 70% of the total weight of the composite material, and the weight of the thermoplastic resin accounts for 20% to 50% of the total weight of the composite material.

9. The composite material according to claim 3, characterized in that The weight of the fiber accounts for 10% to 30% of the total weight of the composite material, the weight of the thermoplastic resin accounts for 60% to 90% of the total weight of the composite material, and the weight of the conductive filler accounts for 2% to 10% of the total weight of the composite material.

10. A touch pen tip, characterized in that: The material of the writing end of the stylus pen tip is the composite material according to any one of claims 1 to 9.

11. The stylus pen tip according to claim 10, characterized in that: The material of the stylus pen tip is the composite material, and the composite material is conductive.

12. A stylus pen tip assembly, characterized in that: A stylus pen comprising a housing and the stylus pen tip according to claim 10 or 11, wherein the stylus pen tip comprises a head and a stem connected along a first direction, the writing end is arranged at the head, and the stem is inserted into the housing; The rod portion includes a first rod segment, the first rod segment is in contact with the inner wall of the shell, and the outer diameter of the first rod segment gradually increases from the first end to the second end, and the first end is closer to the head than the second end.

13. The stylus pen tip assembly according to claim 12, wherein: The stylus tip is mushroom-shaped, the head portion forms a mushroom head, and the stem portion forms a mushroom stem.

14. The stylus pen tip assembly according to claim 12, wherein: The shell is made of injection molding material.

15. The stylus pen tip assembly according to claim 12, wherein: The material of the housing includes polycarbonate or acrylonitrile-butadiene-styrene copolymer.

16. A touch pen, characterized in that: It comprises a pen holder and a stylus pen tip assembly according to any one of claims 12 to 15, wherein the stylus pen tip assembly is connected to the pen holder through the shell.

17. A method for forming a composite material, characterized in that: The method comprises: obtaining a fiber tow; Performing an impregnation treatment on the fiber bundle to obtain a fiber bundle with a surface coated with a thermoplastic resin; The thermoplastic resin coated on the surface of the fiber bundle is cured to obtain the composite material.

18. The method according to claim 17, characterized in that The fiber bundle is a conductive fiber bundle that has been subjected to conductive treatment.

19. The method according to claim 18, characterized in that The conductive treatment comprises: Using alkaline solution to clean the fiber tow; The cleaned fiber bundle is soaked in metal salt water to attach metal ions to the surface of the fiber bundle; The metal ions attached to the surface of the fiber bundle are reduced to make the fiber bundle conductive.

20. The molding method according to claim 17, characterized in that: The fiber bundle is a fiber bundle treated by a grinding gun.

21. The method according to claim 17, characterized in that The step of subjecting the fiber bundle to an impregnation treatment comprises: Mixing the thermoplastic resin and the ester mixed solvent to obtain a mixed solution; The fiber bundle is impregnated with the mixed liquid.

22. A method for molding a stylus pen tip assembly, used for molding the stylus pen tip assembly according to any one of claims 12 to 15, characterized in that: The method comprises: Get the stylus tip; The stylus tip is placed in an injection mold, and a housing is formed by in-mold injection molding to obtain the stylus tip assembly.

23. The method according to claim 22, characterized in that The injection mold comprises a front mold, a rear mold, a first insert and a second insert, wherein: The first insert is arranged in the front mold, and the first insert is sleeved on the outside of the head of the stylus tip. The second insert is passed through the front mold and the rear mold, and is clamped on the stem of the stylus tip. The front mold cavity and the rear mold cavity can form the external structure of the pen tip shell when they are matched, and the second insert and the stylus pen tip can form the internal structure of the pen tip shell when they are matched.

24. The method according to claim 23, characterized in that The head of the stylus tip is interference fit with the inner wall of the first insert, and, along a first direction, the end face of the stylus tip is in contact with the end face of the shell, and the difference between the diameter of the end face of the stylus tip and the diameter of the end face of the shell is 0.1mm to 0.3mm, wherein the diameter of the end face of the stylus tip is larger than the diameter of the end face of the shell, and the first direction is the extension direction of the stylus tip.

25. The method according to claim 23, characterized in that An elastic pad is provided between the stem of the stylus tip and the second insert along a first direction, and the first direction is an extending direction of the stylus tip.

26. The method according to claim 23, characterized in that The housing comprises a first connection portion and a second connection portion connected along a first direction, the first direction being an extending direction of the stylus tip, the first connection portion being used to connect to a rod portion of the stylus tip, the outer diameter of the first connection portion of the housing gradually increasing from the first end thereof to the second end thereof, and the first end of the first connection portion is farther away from the second connection portion than the second end thereof; An annular bone groove is provided on the end surface of the second end.

27. The method according to claim 26, characterized in that The glue inlet of the injection mold is opened in the annular bone groove.

28. The method according to claim 23, characterized in that The shell comprises a first connection part and a second connection part connected along a first direction, the second connection part of the shell is provided with an internal thread for screwing with the pen holder, and a rotation-stopping groove is provided on the outer peripheral surface of the second connection part of the shell.

29. The method according to claim 23, characterized in that The gap between the first insert and the front mold is used for exhaust.

30. A method for molding a stylus pen tip assembly, used for molding the stylus pen tip assembly according to any one of claims 12 to 15, characterized in that: The method comprises: molding a stylus tip and a stylus tip housing in an injection mold by a double-shot injection molding process to obtain the stylus tip assembly.

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