Composite material, touch pen tip, touch pen tip assembly, touch pen and forming method

Abstract

The invention relates to the technical field of touch control, and discloses a composite material, a touch control pen point, a touch control pen point assembly, a touch control pen and a forming method. The composite material at least comprises a mixture of fibers and thermoplastic resin, the fibers and the thermoplastic resin are mutually bonded to jointly form a first porous structure, a second porous structure is formed in the fibers, and the first porous structure and the second porous structure have rebound resilience. According to the composite material, the writing amplitude can be effectively improved, so that sand sound and granular sensation are generated in the writing process, and then a user can feel the vivid texture similar to that of writing on paper.

Description

Technical Field

[0001] 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

[0002] With the popularity of electronic devices with touch functions such as mobile phones, computers, and drawing tablets in people's lives and work, stylus has gradually become one of the mainstream human-computer interaction methods. Users can perform touch operations on touch devices by clicking or sliding the tip of the stylus on the touch screen of the touch device.

[0003] The styluses on the market are mainly divided into electromagnetic styluses and capacitive styluses. For capacitive styluses, the tip of the stylus emits an electrical signal. When the capacitive stylus is close to the touch screen, the electric field on the touch screen will be disturbed and the capacitance inside the touch screen will change. By measuring this capacitance change, the system can determine the position of the capacitive stylus on the touch screen and then realize touch operation.

[0004] Among them, capacitive stylus pens are popular due to their low cost and good compatibility. However, due to the limitations of the material of the current stylus tip, when users use capacitive stylus pens for writing and other operations, it is difficult for users to feel the realistic texture similar to writing on paper, and the writing experience needs to be improved. Summary of the invention

[0005] 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 aspects can be referenced to each other.

[0006] The first aspect of 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.

[0007] According to the embodiment of the present application, when the composite material contacts and slides relative to other objects (for example, the touch screen described in the embodiments below), the first porous structure and the second porous structure will be subjected to stress. As the stress changes, the first porous structure and the second porous structure will be compressed and rebounded, and the air in the first porous structure and the second porous structure will be squeezed and released accordingly, thereby causing greater vibration, so that the particles inside the first porous structure and the second porous structure collide and move with each other, producing obvious rustling sound and granularity, thereby effectively improving the writing experience.

[0008] In a possible implementation of the first aspect, 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, so that the composite material can conduct electricity.

[0009] In a possible implementation of the first aspect above, the composite material further includes a mixture of conductive fillers, fibers and thermoplastic resins, thereby further improving the conductive properties of the composite material.

[0010] In a possible implementation of the first aspect above, the conductive filler includes carbon, metal powder or metal fiber.

[0011] In a possible implementation of the first aspect above, the electrical conductivity of the composite material is 0.001 S / m to 1 S / m.

[0012] In a possible implementation of the first aspect, the fiber includes polyester fiber, polyester fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber or glass fiber.

[0013] 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.

[0014] In a possible implementation of the first aspect above, 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.

[0015] 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.

[0016] 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.

[0017] 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 elaborated here.

[0018] In a possible implementation of the second aspect, the material of the stylus tip is a composite material, and the composite material is conductive, which can further improve the signal strength and stability of the stylus tip, thereby improving the writing linearity of the stylus tip.

[0019] The third aspect of the present application provides a stylus pen tip assembly, which includes 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 includes a head and a rod connected along a first direction, the writing end is arranged at the head, and the rod is inserted into the housing. The rod includes a first rod segment, the first rod segment is in contact with the inner wall of the housing, 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.

[0020] According to the embodiment of the present application, since the material of the writing end of the stylus tip is made of the composite material, when the user uses the stylus tip assembly to write, the first porous structure and the second porous structure in the composite material will repeatedly generate compression and rebound, thereby effectively increasing the writing amplitude, thereby generating a noticeable rustling sound and granular feeling. In addition, the inner wall of the shell fits with the first rod segment, which can effectively enhance the connection strength between the stylus tip and the shell, thereby preventing the stylus tip from detaching from the shell and being damaged when falling, thereby improving the reliability of drop resistance.

[0021] 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.

[0022] According to the embodiment of the present application, since the mushroom-shaped head has a thicker wall thickness, it can have better wear resistance, thereby improving the service life of the stylus tip. At the same time, the mushroom-shaped head is not easy to deform when falling, thereby further improving the drop resistance reliability of the stylus tip.

[0023] In a possible implementation of the third aspect above, the shell is made of injection molding material.

[0024] In a possible implementation of the third aspect above, the material of the shell includes polycarbonate or acrylonitrile-butadiene-styrene copolymer.

[0025] A fourth aspect of the present application provides a stylus pen, which includes a pen holder 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 holder via a shell.

[0026] 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.

[0027] A fifth aspect of the present application provides a method for forming a composite material, the method comprising:

[0028] obtaining a fiber tow;

[0029] Performing an impregnation treatment on the fiber bundle to obtain a fiber bundle with a surface coated with a thermoplastic resin;

[0030] The thermoplastic resin coated on the surface of the fiber tow is cured to obtain a composite material.

[0031] The molding method of the composite material can obtain a mixture of fibers and thermoplastic resins through treatments such as impregnation and curing, and then obtain a composite material. The mutually bonded fibers and thermoplastic resins can form a first porous structure with resilience, and the inside of the fibers can form a second porous structure with resilience, so that the composite material can produce obvious rustling sound and granularity when rubbed against other objects (for example, the touch screen described in the embodiments below). This method has simple steps and low molding difficulty.

[0032] In a possible implementation of the fifth aspect, the fiber bundle is a conductive fiber bundle that has been subjected to a conductive treatment, so that the prepared composite material can be conductive.

[0033] In a possible implementation of the fifth aspect, the conductive processing includes:

[0034] The fiber tow is cleaned with alkali solution;

[0035] The cleaned fiber bundle is soaked in metal salt water to attach metal ions to the surface of the fiber bundle;

[0036] The metal ions attached to the surface of the fiber bundle are reduced to make the fiber bundle conductive.

[0037] In a possible implementation of the fifth aspect, the fiber bundle is a fiber bundle processed by a grinding gun.

[0038] According to the implementation mode of the present application, the uniformity, surface quality and processability of the conductive fiber bundle can be further improved by preforming the fiber bundle with a grinding gun.

[0039] In a possible implementation of the fifth aspect, the fiber tow is subjected to an impregnation treatment, including:

[0040] Mixing a thermoplastic resin and an ester mixed solvent to obtain a mixed solution;

[0041] The fiber bundle is impregnated with the mixed liquid.

[0042] 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 treatment and further improving the yield rate of the composite material.

[0043] A sixth aspect of the present application provides a method for molding 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 comprising:

[0044] Get the stylus tip;

[0045] The stylus tip is placed in an injection mold, and a shell is formed by in-mold injection molding to obtain a stylus tip assembly.

[0046] The molding method of the stylus tip assembly first uses a composite material to make a stylus tip, and then the shell and the stylus tip are molded into one piece by in-mold injection molding, which can make the shape of the shell more compatible with the shape of the stylus tip, effectively reduce the matching gap between the shell and the stylus tip, thereby improving the accuracy of the stylus tip assembly, and then improve the accuracy of transmitting writing force and pressure, and reduce the shaking feeling of the stylus tip assembly when writing. In addition, this molding method is simple, the stylus tip assembly has a low yield rate, and good aesthetics.

[0047] In a 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 in the front mold, the first insert is sleeved on the outside of the head of the stylus tip, and the second insert is passed through the front mold and the rear mold and clamped on the stem of the stylus tip. The front mold cavity and the rear mold cavity can form the external structure of the nib shell after being matched, and the second insert can form the internal structure of the nib shell after being matched with the stylus tip.

[0048] 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.

[0049] Based on this, the radial tolerance of the stylus tip can be effectively reduced to ensure that the stylus tip and the first insert can fit tightly, thereby achieving injection molding 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.

[0050] 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, and the first direction is an extension direction of the stylus tip, thereby effectively reducing the axial tolerance of the stylus tip.

[0051] In a possible implementation of the sixth aspect, the housing includes a first connection portion and a second connection portion connected along a first direction, the first direction is an extension direction of the stylus tip, the first connection portion is used to connect to a rod portion of the stylus tip, the outer diameter of the first connection portion of the housing gradually increases from its first end to its second end, and the first end of the first connection portion is farther away from the second connection portion than the second end. An annular bone position groove is provided on the end surface of the second end.

[0052] According to the embodiment of the present application, the outer diameter of the first connecting portion of the shell gradually increases from the first end to the second end, which can make the shape of the stylus tip more smooth, more beautiful and refined. In addition, the annular bone groove can effectively reduce the thickness of the second end, thereby avoiding shrinkage such as local depressions and cavities at the second end during injection molding, thereby further improving the yield rate of the shell.

[0053] In a possible implementation of the sixth aspect, the injection port of the injection mold is opened in the annular bone groove, thereby avoiding leaving injection marks (e.g., spray marks and air marks caused by injection) on the surface of the stylus tip assembly, effectively improving the aesthetics and refinement of the stylus tip assembly.

[0054] In a possible implementation of the sixth aspect 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 an outer peripheral surface of the second connecting portion of the shell.

[0055] According to the embodiment of the present application, the housing and the pen holder are detachably connected by a threaded connection, so that the stylus tip assembly can be replaced at any time according to actual needs. At the same time, the threaded connection can effectively enhance the connection strength between the housing and the pen holder, further improving the drop reliability. In addition, the anti-rotation groove can prevent the housing from rotating with the rotation of the second insert. In this way, after the internal thread of the housing is formed, the second insert can be smoothly rotated out to avoid damage to the housing during the demolding process, effectively improving the yield rate of the housing.

[0056] In a possible implementation of the sixth aspect above, the gap between the first insert and the front mold is used for exhaust.

[0057] Based on this, there is no need to open additional exhaust grooves on the front mold, so that the appearance of the stylus tip assembly after molding is smooth and flawless, further improving the aesthetics of the stylus tip assembly. At the same time, the gap between the first insert and the front mold can ensure smooth glue flow after glue injection, avoiding air entrapment and glue shortage in complex structures or dead corners.

[0058] The seventh aspect of the present application provides a molding method of 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 comprises: 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.

[0059] The above-mentioned molding method of the stylus pen tip assembly can mold the stylus pen tip assembly in one step, effectively reduce the matching clearance between the stylus pen tip and the housing, avoid installation deviation caused by multiple injection molding assemblies, and improve molding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 An exemplary scene diagram of the interaction between the stylus pen and the electronic device in the embodiment of the present application is shown;

[0061] Figure 2 A schematic diagram of the structure of a stylus in some technical solutions is shown;

[0062] Figure 3 Shows a schematic diagram of the structure of a stylus in some other technical solutions;

[0063] Figure 4A shows a micrograph of a composite material in an example of the present application;

[0064] Figure 4B It shows that the composite material in the embodiment of the present application Figure 4A A local magnified image of the middle S1 region;

[0065] Figure 5A A schematic diagram of the structure of a stylus pen in an embodiment of the present application is shown;

[0066] Figure 5B The stylus in the embodiment of the present application is shown Figure 5A A local magnified image of the middle S2 region;

[0067] Figure 5C It shows that the stylus in the embodiment of the present application is Figure 5A Cross-sectional view of AA in the middle S2 region;

[0068] Fig. 6A A side view of a stylus tip assembly in an embodiment of the present application is shown;

[0069] Figure 6B The stylus tip assembly in the embodiment of the present application is shown in FIG. Fig. 6A Sectional view of AA in the middle;

[0070] Figure 7 A schematic diagram of the structure of the stylus tip in an embodiment of the present application is shown;

[0071] Figure 8A flow chart showing a method for forming a composite material in an embodiment of the present application is shown;

[0072] Fig. 9 A flow chart showing a method for forming a stylus pen tip in an embodiment of the present application is shown;

[0073] Fig.10 A flow chart showing a method for forming a stylus pen tip assembly in an embodiment of the present application is shown;

[0074] Fig.11 A schematic diagram of molding a stylus pen tip assembly by in-mold injection molding in an injection mold in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0075] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0076] The embodiment of the present application is used to provide a composite material, which can be applied to the stylus tip of a stylus pen, and can effectively improve the writing experience. Before describing the technical solution of the present application, an exemplary application scenario of the present application is first introduced in conjunction with the accompanying drawings.

[0077] Figure 1 FIG. 1 shows an exemplary scene diagram of the interaction between the stylus pen 1 and the electronic device 2 in an embodiment of the present application. Figure 1 As shown, the electronic device 2 can be any electronic device that can interact with the stylus 1. For example, the electronic device 2 can be any electronic device with a touch function, such as a mobile phone, a tablet computer, a laptop computer, a drawing tablet, a media player, a wearable device, an e-reader, or a touch-controlled TV, and the present application does not limit this. The following is an explanation using the electronic device 2 being a tablet computer as an example.

[0078] like Figure 1 As shown, the stylus 1 may include a stylus tip assembly 01 and a pen body 02. The stylus tip assembly 01 includes a stylus tip 10 and a shell 20 connected to each other. The shell 20 is connected to one end of the pen body 02 to mount 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.

[0079] The following describes an exemplary structure of the stylus pen in conjunction with the accompanying drawings.

[0080] Figure 2 The schematic diagram of the structure of the stylus pen 1a in some technical solutions is shown. 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 a 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.

[0081] In the above-mentioned stylus pen 1a, the materials of the stylus tip 10a and the shell 20a of the stylus pen 1a are both 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 granularity will be produced, and it is difficult for users to feel the realistic texture similar to writing on paper.

[0082] Figure 3 FIG. 1 shows a schematic diagram of the structure of the stylus pen 1b in some other technical solutions. Figure 3 , the material of the stylus tip 10b of the stylus 1b is 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 pressing block 05b and a cotton tube 06b are provided inside the pen body 02b. Among them, the top of the elastic member 04b is connected to the top cover 03b, and the bottom is fixedly connected to the pressing block 05b. The bottom of the pressing block 05b is movably connected to the top of the cotton tube 06b. The outer side of the cotton tube 06b is a plastic film, and the inside 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 pressure to the stylus 1b so that the conductive liquid in the cotton tube 06b can fully soak the stylus tip 10b, thereby realizing the touch operation.

[0083] In the above-mentioned stylus 1b, the material of the stylus tip 10b of the stylus tip 1b is relatively soft fiber. Therefore, when the stylus tip 10b contacts the touch screen, it is also difficult to produce obvious rustling sound and grainy feeling.

[0084] In summary, due to the limitation of the material of the stylus tip, the user cannot produce obvious rustling sound and graininess when using the stylus for writing and other operations. Therefore, the user cannot feel the realistic texture similar to paper, and the accuracy and fluency of writing are poor.

[0085] The composite material provided in the embodiment of the present application is used to improve the above-mentioned problems. In the embodiment of the present application, the composite material includes a porous structure (for example, 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 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 granularity more obvious, making the writing more real and natural, helping the user to better control the writing speed and strength, and improving the accuracy and comfort of writing.

[0086] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0087] Figure 4A A micrograph of the composite material 100 in an example of the present application is shown. Figure 4B The composite material 100 in the embodiment of the present application is shown in Figure 4A A partial enlarged view of the S1 region in the middle. Figure 4A and Figure 4B , the composite material 100 includes at least a mixture of fibers 110 and a thermoplastic resin 120 .

[0088] The fibers 110 and the thermoplastic resin 120 are bonded to each other. That is, there is an adhesive force between the contact surfaces of the fibers 110 and the thermoplastic resin 120, so that the fibers 110 and the thermoplastic resin 120 become a whole. The mutually bonded fibers 110 and the thermoplastic resin 120 can form a first porous structure 130 together. The first porous structure 130 includes a plurality of pores G1 formed between adjacent fibers 110 and thermoplastic resins 120.

[0089] refer to Figure 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 can be compressed and rebounded. The second porous structure 140 includes a plurality of pores G2 formed between adjacent fiber filaments 111.

[0090] The first porous structure 130 and the second porous structure 140 are both resilient, that is, the first porous structure 130 and the second porous structure 140 will deform under the action of external force, and when the external force applied to the first porous structure 130 and the second porous structure 140 is removed, the first porous structure 130 and the second porous structure 140 can quickly return to their original shapes.

[0091] When the composite material 100 contacts and slides relatively with the touch screen (for example, the display screen 201 described above), the first porous structure 130 and the second porous structure 140 are subjected to stress. 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 are compressed and rebounded, and the air in the pores G1 and G2 is squeezed and released accordingly, thereby causing greater vibration, so that the particles inside the first porous structure 130 and the second porous structure 140 collide and move with each other, producing an obvious rustling sound and a granular feel, thereby effectively improving the writing experience.

[0092] 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 .

[0093] In some embodiments of the present application, the porosity of the first porous structure 130 may be 5-10%.

[0094] In some embodiments of the present application, the porosity of the second porous structure 140 may be 5-30%.

[0095] In some embodiments of the present application, the composite material 100 has a conductive property, which can effectively enhance the signal strength of the stylus tip 10 and improve the writing linearity of the stylus tip 10. For example, the fiber 110 of the composite material 100 can be a conductive fiber that has been subjected to a conductive treatment, so that the composite material 100 can be conductive. For another example, the thermoplastic resin 120 of the composite material 100 can be a conductive thermoplastic resin that has been subjected to a conductive treatment, so that the composite material 100 can be conductive.

[0096] Furthermore, the composite material 100 may also include a mixture of conductive fillers (e.g., carbon, metal powder or metal fiber), fibers 110, and thermoplastic resin 120. The conductive fillers can further enhance the conductivity of the composite material 100, thereby effectively enhancing the signal strength of the stylus tip 10 and improving the writing linearity of the stylus tip 10.

[0097] Exemplarily, the weight of fiber 110 may account for 10% to 30% of the total weight of composite material 100 , the weight of thermoplastic resin 120 may account for 60% to 90% of the total weight of composite material 100 , and the weight of conductive filler may account for 2% to 10% of the total weight of composite material 100 .

[0098] 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.

[0099] In some embodiments of the present application, the fiber 110 includes polyester fiber, polyester fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber or glass fiber.

[0100] 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., polyoxymethylene (POM)) or a thermoplastic polyamide elastomer resin (e.g., thermoplastic polyamide elastomer (TPAE)).

[0101] In some implementations, the thermoplastic resin 120 may be a polyurethane resin. The polyurethane resin contains alternating soft segments (flexible long chains of oligomer polyols) and hard segments (diisocyanates and chain extenders), as well as hydrogen bonds in the polyurethane groups, and has strong intermolecular forces. Therefore, the polyurethane resin has excellent wear resistance and toughness after curing, thereby further improving the durability of the composite material 100.

[0102] The present application also provides a stylus tip, a stylus tip assembly and a stylus including the stylus tip. The material of the writing end of the stylus tip provided in the present application (i.e., the end of the stylus tip that contacts the touch screen when writing) is the composite material 100, which can effectively increase the writing amplitude, thereby enhancing the rustling sound and granularity when writing, and improving the user experience. The following is a detailed description with reference to the accompanying drawings.

[0103] FIG. 5A to FIG. 5C The schematic diagram of the structure of the stylus pen 1 in the embodiment of the present application is shown. Figure 5B The stylus pen 1 is shown in Figure 5A A partial enlarged view of the S2 area in the figure, and the dotted line shows the internal structure of the stylus pen 1, Figure 5C The stylus pen 1 is shown in Figure 5A A cross-sectional view of the AA section of the S2 region. FIG. 5A to FIG. 5C The stylus pen 1 includes a stylus pen tip assembly 01 and a pen holder 02 .

[0104] 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 which are 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 holder 02.

[0105] The pen holder 02 extends along the X direction. The pen holder 02 may 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, hexagon, octagon, or irregular polygon, etc., and the present application does not limit this.

[0106] In some embodiments of the present application, a pressure sensing module 03 may be provided inside the pen body 02. The pressure sensing module 03 is connected to the stylus tip 10 to accurately measure the force applied by the user to press the stylus 1, thereby further improving the writing accuracy. In other embodiments, other components may be provided on the pen body 02, such as buttons, input / output components (USB interface), or caps, etc., and the present application does not impose any restrictions on this.

[0107] Since the writing end 111 of the stylus pen tip 10 is made of the composite material 100, when the user uses the stylus pen 1 to write, the first porous structure 130 and the second porous structure 140 in the composite material 100 will repeatedly generate compression and rebound, thereby effectively increasing the writing amplitude, thereby generating obvious rustling sound and granular feeling. The specific principle of the composite material 100 generating rustling sound and granular feeling can be referred to the above Figure 4A and Figure 4B And the related descriptions are not 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, and improving the writing amplitude, thereby 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 master the writing speed, writing strength, and pen stroke changes, etc., to improve the accuracy and fluency of writing.

[0108] In addition, the composite material 100 has a certain flexibility. When the stylus pen 1 falls, the composite material 100 can generate deformation buffer, effectively absorb the impact energy generated by the fall, avoid damage to the internal components of the stylus pen 1 (for example, the pressure sensing module 03), and effectively improve the drop resistance reliability of the stylus pen 1.

[0109] In some embodiments of the present application, the material of each part of the stylus tip 10 can be the composite material 100 mentioned above. The composite material 100 has a conductive property. In other words, the conductive composite material 100 can be used to make a conductive stylus tip 10. In this way, the conductive part of the stylus tip 10 can directly contact the touch screen (for example, the display screen 201 mentioned above), thereby further improving the signal strength and stability of the stylus 1, and further improving the writing linearity of the stylus 1.

[0110] For example Figure 2 As shown, since the insulating shell 20a and the elastic pen tip are wrapped around the conductive stylus tip 10a, the stylus tip 10a will not directly contact the touch screen when the stylus 1a is used for writing. The stylus tip 10a will generate a certain signal loss when transmitting the capacitive signal. Figure 3 As shown in FIG. 1 , when the user holds the stylus pen 1b and writes, the pressure applied to the stylus pen 1b will change, resulting in different degrees of infiltration of the stylus pen tip 10b by the conductive liquid, which in turn causes the signal of the stylus pen 1b to fluctuate greatly. In the embodiment of the present application, the material of the stylus pen tip 10 of the stylus pen 1 is a conductive composite material 100, and the conductive part of the stylus pen tip 10 can directly contact the touch screen, and there is no insulating layer to hinder the transmission of the signal. Therefore, compared with Figure 2 The stylus pen 1a and Figure 3 The stylus pen 1b shown in the present application has better signal strength and stability.

[0111] also, Figure 3 The stylus tip 1b shown needs to be provided with an elastic member 04b, a pressing block 05b and a cotton tube 06b to make the stylus tip 10b conductive, which has a complex structure and increases the difficulty of assembly. In the present application, the stylus tip 10 can be made of a conductive composite material 100, which can be conductive itself, so there is no need to add other components to the stylus 1 to assist the stylus tip 10 to achieve the conductive function, and the structure of the stylus 1 is simpler and the difficulty of assembly is lower.

[0112] The specific structure and connection method of each component in the touch pen 1 are further described below with reference to the accompanying drawings.

[0113] Fig. 6A and Figure 6B The structure diagram of the stylus tip assembly 01 in the embodiment of the present application is shown, wherein: Fig. 6A is a side view of the stylus tip assembly 01, Figure 6B For the stylus tip assembly 01 Fig. 6A Sectional view of AA. Figure 7 A schematic diagram of the structure of the stylus pen tip 10 in an embodiment of the present application is shown.

[0114] Combination FIG. 6A to FIG. 7 , the rod portion 12 of the stylus tip 10 includes a first rod segment 121. The outer diameter of the first rod segment 121 gradually increases from the first end 1211 to the second end 1212. Among them, the first end 1211 of the first rod segment 121 is closer to the head 11 than the second end 1212 of the first rod segment 121. The shape of the inner wall 23 of the shell 20 is adapted to the shape of the first rod segment 121, so that the first rod segment 121 fits the inner wall 23. In this way, the connection strength between the stylus tip 10 and the shell 20 can be effectively enhanced, thereby preventing the stylus tip 10 from being detached from the shell 20 and damaged when falling, thereby improving the reliability of drop resistance.

[0115] In some embodiments of the present application, the stylus tip 10 is mushroom-shaped. The head 11 of the stylus tip 10 is formed into a mushroom head, and the stem 12 is formed into a mushroom stem. Since the mushroom-shaped head 11 has a thicker wall thickness, it can have better wear resistance, thereby improving the service life of the stylus tip 10. At the same time, the mushroom-shaped head 11 is not easy to deform when falling, thereby further improving the drop resistance reliability of the stylus tip 10.

[0116] Compare the above Figure 2 In the solution of using a shell 20a to wrap the stylus tip 10a, the thickness of the shell 20a is limited because it is necessary to ensure that the stylus tip 10a can transmit a signal of a certain strength. Therefore, the shell 20a is easily deformed after long-term use or after falling, and the wear resistance is also poor. However, the present application can effectively improve the wear resistance and drop resistance reliability by designing the stylus tip 10 into a mushroom shape.

[0117] Continue reading Figure 6B and Figure 7 In some embodiments of the present application, along the X direction, the end surface 13 of the stylus tip 10 is in contact with the end surface 24 of the housing 20. The difference between the diameter of the end surface 13 and the diameter of the end surface 24 is 0.1 mm to 0.3 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, etc. In addition, the diameter of the end surface 13 is greater than the diameter of the end surface 24. This can help avoid the generation of scratches during the molding process of the stylus tip assembly 01, thereby further improving the aesthetics of the stylus tip assembly 01 and preventing scratches.

[0118] In some embodiments of the present application, the outer diameter of the first connection portion 21 of the housing 20 gradually increases from the first end 211 to the second end 212, so that the appearance of the stylus tip 1 is smoother, more beautiful and refined. The first end 211 of the first connection portion 21 is farther away from the second connection portion 22 than the second end 212.

[0119] 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 may be opened on the end surface 2121 of the second end 212.

[0120] In some embodiments of the present application, the stylus tip assembly 01 and the pen holder 02 are detachably connected, so that the stylus tip assembly 01 can be replaced at any time according to actual needs. Figure 6B Combined with Figure 5B and Figure 5C , the second connection portion 22 of the housing 20 is provided with an internal thread 221. The pen holder 02 is provided with an external thread 04. The internal thread 221 and the external thread 04 are screwed together, so that the housing 20 is connected to the pen holder 02. In this way, the stylus tip assembly 01 can be removed from the pen holder 02 by rotating the housing 20 for easy replacement. In addition, the screwing of the internal thread 221 and the external thread 04 can effectively enhance the connection strength between the housing 20 and the pen holder 02, so that the stylus 1 is not easy to break, and the reliability of the stylus 1 in case of falling is further improved.

[0121] 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 may be provided on the outer peripheral surface of the second connecting portion 22 of the shell 20.

[0122] In some embodiments of the present application, the material of the housing 20 is 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).

[0123] After introducing the specific structures of the components and materials in the stylus pen 1 , the molding methods of the components and materials in the stylus pen 1 are further introduced below.

[0124] The present application provides a molding method of a composite material 100 , which is introduced below.

[0125] Figure 8 FIG. 1 is a flow chart showing a method for forming a composite material 100 in an embodiment of the present application. Figure 8 , the molding method specifically comprises the following steps:

[0126] S110: Obtaining a fiber tow.

[0127] In some embodiments of the present application, the fiber 110 may be stretched and spun by a spinning process to obtain a fiber bundle, wherein the fiber 110 may include polyester fiber, polyester fiber, acrylic fiber or nylon fiber.

[0128] S120: performing an impregnation treatment on the fiber bundle to obtain a fiber bundle with a surface coated with a thermoplastic resin.

[0129] 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, and then the fiber tow may be pre-impregnated with the mixture of the thermoplastic resin 120 and the ester solvent, and the fiber tow may be impregnated with the flowing mixture of the thermoplastic resin 120 and the ester solvent. The ester solvent may further improve the fluidity of the thermoplastic resin 120, thereby reducing the difficulty of the impregnation process, and further improving the yield rate of the composite material 100.

[0130] 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.

[0131] In some implementations, the thermoplastic resin 120 may be a polyurethane resin. The polyurethane resin contains alternating soft segments (flexible long chains of oligomer polyols) and hard segments (diisocyanates and chain extenders), as well as hydrogen bonds in the polyurethane groups, strong intermolecular forces, and excellent wear resistance and toughness after curing, thereby further improving the durability of the composite material.

[0132] S130: Curing the thermoplastic resin coated on the surface of the fiber bundle to obtain a composite material.

[0133] According to the above steps, the fiber bundle coated with the thermoplastic resin 120 can be placed in a heating furnace. The ester solvent is volatilized by heating in the heating furnace, so that the thermoplastic resin 120 is dried and solidified, thereby obtaining a composite material 100 with appropriate hardness.

[0134] The molding method of the composite material 100 can obtain a mixture of the fiber 110 and the thermoplastic resin 120 through treatments such as impregnation and curing, thereby obtaining the composite material 100. The mutually bonded fiber 110 and the thermoplastic resin 120 can jointly form a first porous structure with resilience (for example, Figure 4A The first porous structure 110 shown in the figure can form a second porous structure with resilience inside the fiber 110 (for example, Figure 4B The second porous structure 120 is shown, so that when the composite material 100 is rubbed against the touch screen, it can produce obvious rustling sound and graininess. This method has simple steps and low molding difficulty.

[0135] In some embodiments of the present application, the fiber bundles mentioned above may be conductive fiber bundles that have been subjected to conductive treatment, so that the prepared composite material 100 can be conductive.

[0136] Exemplarily, the conductive treatment may specifically include: first, washing the fiber bundle with an alkali solution. Then, soaking the washed fiber bundle in a metal salt solution so that metal ions can adhere to the surface of the fiber bundle. Finally, reducing the metal ions attached to the surface of the fiber bundle, so that the fiber bundle can conduct electricity, thereby obtaining a conductive composite material 100.

[0137] In some of the implementations, the metal ions attached to the surface of the fiber bundle can be reduced by physical vapor deposition (PVD) to further improve the conductive properties of the fiber bundle.

[0138] In some implementations, the metal salt water may be copper sulfate-based metal salt water, nickel sulfate-based metal salt water or copper chloride-based metal salt water. Accordingly, the metal ions may be copper-containing metal ions or nickel-containing metal ions.

[0139] In some embodiments of the present application, the fiber bundles may be preformed by a grinding gun to further improve the uniformity, surface quality and processability of the conductive fiber bundles. For example, after the conductive treatment of the fiber bundles, the fiber bundles may be preformed by a grinding gun to eliminate surface defects (e.g., uneven large protrusions and depressions) caused by the conductive treatment, so as to facilitate subsequent processing and forming to obtain the composite material 100, and further improve the yield rate of the composite material 100.

[0140] 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, and the molding method is introduced below.

[0141] Fig. 9 FIG. 1 is a flow chart showing a method for forming a stylus tip 10 in an embodiment of the present application. Fig. 9 , the molding method specifically comprises the following steps:

[0142] S210: Obtaining a conductive composite material.

[0143] The specific method for obtaining the conductive composite material 100 may refer to the aforementioned molding method of the conductive composite material 100 , which will not be described in detail herein.

[0144] S220: trimming the conductive composite material to obtain a stylus tip.

[0145] In some embodiments of the present application, the conductive composite material 100 can be cut, ground, or processed into a desired shape (for example, the above-mentioned Figure 7 The stylus tip 10 is thus obtained.

[0146] The above-mentioned stylus tip forming method can obtain the stylus tip 10 by appropriately trimming the conductive composite material 100. Since the conductive composite material 100 includes a porous structure (for example, Figure 4A and Figure 4B The first porous structure 130 and the second porous structure 140 are shown in FIG. 1 , so when the stylus tip 10 is used for writing, an obvious rustling sound and a granular feeling can be generated, thereby effectively improving the writing experience of the user. This method has simple steps and low molding difficulty.

[0147] Based on the molding method of the composite material 100 and the molding method of the stylus tip 10 provided in the present application, the present application also provides a molding method of the stylus tip assembly 01, and the molding method is introduced below.

[0148] Fig.10 FIG. 1 is a flow chart showing a method for forming a stylus tip assembly 01 in an embodiment of the present application. Fig.10 , the molding method specifically comprises the following steps:

[0149] S310: Obtain a stylus tip.

[0150] The specific method of obtaining the stylus pen tip 10 may refer to the aforementioned steps S210 and S220, which will not be described in detail herein.

[0151] S320: placing the stylus tip into an injection mold, and molding a shell by in-mold injection molding to obtain a stylus tip assembly.

[0152] For example, Fig.11 FIG. 1 is a schematic diagram showing a stylus tip assembly 01 formed by in-mold injection molding in an injection mold 3 in an embodiment of the present application. Fig.11 The injection mold 3 includes a front mold 31 , a rear mold 32 , a first insert 33 and a second insert 34 .

[0153] The first insert 33 is disposed in the front mold 31. The first insert 33 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 stem 12 of the stylus tip 10.

[0154] 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 pen tip 10 can form the internal structure of the housing 20 .

[0155] 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.

[0156] The molding method of the stylus tip assembly 01 is to first produce the stylus tip 10, and then to mold the housing 20 and the stylus tip 10 into one piece by in-mold injection molding, so that the shape of the housing 20 is more compatible with the shape of the stylus tip 10, and the matching gap between the housing 20 and the stylus tip 10 is effectively reduced, thereby improving the accuracy of the stylus tip assembly 01, and then improving the accuracy of transmitting writing force and pressure, and reducing the shaking feeling of the stylus tip assembly 01 when writing. In addition, this molding method is simple, the stylus tip assembly 01 has a low yield rate, and good aesthetics.

[0157] For example, the above Figure 3 In the stylus tip assembly 01b shown, the stylus tip 10b and the pen holder 02b are formed separately, and the stylus tip 10b is formed by grinding, and the forming precision is poor. The stylus tip 10b is installed on the pen holder 02b by plugging and unplugging, and there is an installation error between the pen holder 02b and the stylus tip 10b, and the matching precision is low. As a result, the stylus tip assembly 01b cannot accurately transmit the writing force and pressure, the writing shaking feeling is strong, and the appearance is not refined. In the present application, the stylus tip 10 and the shell 20 are injection molded into one by in-mold injection molding. The shell 20 can fit more closely with the stylus tip 10, effectively avoiding the installation error caused by the poor grinding forming precision, improving the matching precision, and there is no shaking feeling when writing, and the writing force and pressure can be accurately transmitted. At the same time, the aesthetics of the integrated stylus tip 10 and the shell 20 are also better.

[0158] The structure of the injection mold 3 is described in detail below with reference to the accompanying drawings.

[0159] Continue to refer Fig.11 Combined with Figure 6B and Figure 7 In some embodiments of the present application, along the X direction, the end surface 13 of the stylus tip 10 fits with the end surface 24 of the housing 20. The difference between the diameter of the end surface 13 and the diameter of the end surface 24 is 0.1 mm to 0.3 mm, wherein the diameter of the end surface 13 is greater than the diameter of the end surface 24. In addition, the head 11 of the stylus tip 10 is interference-fitted with the inner wall 331 of the first insert 33.

[0160] Based on this, the radial tolerance of the stylus tip 10 can be effectively reduced to ensure that the stylus tip 10 and the first insert 33 can fit tightly, thereby achieving 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.

[0161] 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 , so as to effectively reduce the axial tolerance of the stylus tip 10 .

[0162] Continue to refer Fig.11 Combined with Figure 6B In some embodiments of the present application, an annular groove 213 may be provided 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 avoiding shrinkage such as local depressions and cavities at the second end 212 during injection molding, thereby further improving the yield rate of the housing 20.

[0163] In some embodiments of the present application, the glue inlet can be opened in the annular bone groove 213 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.

[0164] In some embodiments of the present application, a rotation-stopping groove 222 may be provided on the outer circumferential surface of the second connecting portion 22 of the housing 20. The rotation-stopping groove 222 may prevent the housing 20 from rotating along with the rotation of the second insert 34. In this way, after the internal thread 221 of the housing 20 is formed, the second insert 34 may be smoothly rotated and removed, thereby avoiding damage to the housing 20 during the demolding process, and effectively improving the yield rate of the housing 20.

[0165] Continue reading Fig.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 exhaust. In this way, there is no need to open other exhaust grooves on the front mold 31, so that the appearance of the stylus tip assembly 01 after molding is smooth and flawless, further improving the aesthetics of the stylus tip assembly 01. At the same time, the gap G3 can ensure smooth glue flow after glue injection, avoiding the occurrence of complex structures or dead corners (for example, Fig.11 In the S3 area in the test tube, there are air entrapment and glue shortage.

[0166] In some other embodiments of the present application, the composite material 100 may also be formed by injection molding.

[0167] 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.

[0168] The material of the fiber 110 may be carbon fiber, aramid fiber or glass fiber. The thermoplastic resin 120 may be polyurethane resin, polycarbonate resin, polyoxymethylene resin or thermoplastic polyamide elastomer resin.

[0169] 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, so that the composite material 100 can be conductive. For example, a conductive filler (e.g., carbon, metal powder, or metal fiber) may be filled in the molten thermoplastic resin 120 to make the thermoplastic resin 120 conductive.

[0170] 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 an injection mold by an injection molding machine, and the conductive composite material 100 is obtained after cooling and shaping.

[0171] 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 .

[0172] For example, the injection molding material for making the stylus tip 10 and the injection molding material for making the housing 20 can be prepared first, and then the two injection molding materials are respectively injected into the cavity of the injection mold (such as the above-mentioned injection mold 3) by a double-shot injection molding machine, and after cooling and shaping, the stylus tip assembly 01 is obtained. Among them, the injection molding material used to make the stylus tip 10 is consistent with the injection molding material used to make the conductive composite material 100, and will not be described in detail here.

[0173] The molding method of the stylus tip assembly 01 can mold the stylus tip assembly 01 in one step, thereby effectively reducing the matching gap between the stylus tip 10 and the housing 20, improving the molding accuracy, and the stylus tip assembly 01 has a high yield rate. Figure 2In the stylus tip assembly 01a shown, the stylus tip 10a and the conductive lead pin 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 tip 10a by adhesive or hot melt, etc., to finally obtain the stylus tip assembly 01a. The molding steps of the stylus tip assembly 01a are cumbersome and complicated, and the molding accuracy is unstable, resulting in a low yield rate of the stylus tip assembly 01a. In the present application, the stylus tip assembly 01 can be molded in one go by the above molding method, thereby effectively avoiding the installation deviation caused by multiple injection molding assemblies, and the molding accuracy and yield rate are higher, and the steps are simple.

[0174] In some embodiments of the present application, the molding shrinkage of the injection molding material used to make the housing 20 is similar to the molding shrinkage of the injection molding material used to make the stylus tip 10, thereby further improving the molding accuracy, making the appearance of the stylus tip assembly 01 smoother, and reducing the need for subsequent processing and trimming. For example, the injection molding material used to make the housing 20 can be polycarbonate or acrylonitrile-butadiene-styrene copolymer.

[0175] 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, penetration and penetration in a molten state, forming a bond at the molecular chain level, thereby improving the adhesion, and further improving the connection strength between the stylus tip assembly 10 and the housing 20.

[0176] The technical solution of this embodiment is introduced above. 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.

[0177] For example, in this embodiment, double-shot injection molding is performed in an injection mold to obtain an integrally formed stylus pen tip assembly 01, but the present application is not limited thereto.

[0178] In some other embodiments, the stylus tip 10 may be firstly injection molded in an injection mold, and then the housing 20 may be injection molded in the injection mold by in-mold injection molding, thereby obtaining the stylus tip assembly 01. The injection molding material used to make the stylus tip 10 is consistent with the injection molding material used to make the conductive composite material 100, and the injection molding material used to make the housing 20 is consistent with the injection molding material used to make the housing 20 in the double-shot injection molding process, which will not be described in detail here.

[0179] 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.

[0180] The above is an explanation of the implementation mode of the present application by 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 mode. On the contrary, the purpose of introducing the application in conjunction with the implementation mode 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 without conflict.

[0181] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "outside", "inside", "circumferential", "radial", "axial" 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0182] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection" and "fitting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0183] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also 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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