Pen tip assembly, preparation method thereof, composite material and touch pen

Abstract

The invention provides a pen point assembly, a preparation method thereof, a composite material and a touch pen. The pen point assembly comprises a mounting shell and a pen point. Wherein the mounting shell is an insulating shell and is provided with a first end face and a first mounting hole, and the first mounting hole penetrates through the shell from the first end face. The pen point is made of conductive plastic and comprises a writing face and a second end face which are oppositely arranged, the writing face is a convex arc face used for writing, the second end face faces the first end face and is connected with the first end face, the pen point blocks the first mounting hole, and the hardness of the pen point is smaller than that of the mounting shell. According to the pen point assembly, the coupled semaphore between the pen point and the touch screen can be improved so as to improve the positioning accuracy in the writing process, and the wear resistance of the pen point is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic equipment, and in particular to a stylus pen tip assembly and a preparation method thereof, a composite material and a stylus pen. Background Art

[0002] When the stylus writes or draws on the screen, the pen tip emits high-frequency current. The touch screen receives the current signal emitted by the pen tip, and the processor processes the current signal received by the screen to obtain the coordinates of the pen tip on the screen. Figure 1 FIG. 1 is a schematic diagram of the structure of a pen tip assembly of an existing stylus pen. Figure 1 As shown, the pen tip assembly of the stylus pen includes an outer coating layer 101 and an inner conductive electrode 102, wherein the outer coating layer 101 is a non-conductive plastic, and the inner conductive electrode 102 is a metal electrode. The signal between the conductive electrode 102 and the touch screen needs to pass through the coating layer 101. In this structure, in order to achieve a sufficiently large coupled signal amount, the coating layer 101 is generally a soft material with low hardness. If the coating layer 101 is thicker, less charge is coupled to the touch screen through the coating layer 101, resulting in a low signal amount, inability to achieve precise positioning, and insensitive writing. If the coating layer is thinner, the wear resistance of the coating layer will deteriorate, and the sliding damping force generated between the pen tip assembly and the touch screen will be reduced, thereby affecting the service life of the pen tip assembly and the writing experience. Summary of the invention

[0003] The present application provides a pen tip assembly and a preparation method thereof, a composite material and a stylus pen, so that the pen tip can have both high positioning accuracy and high wear resistance.

[0004] In a first aspect, the present application provides a nib assembly of a stylus pen, wherein the nib assembly is applied to a stylus pen, and the stylus pen is an input device of an electronic device. The nib assembly includes a mounting shell and a nib. The mounting shell is an insulating shell, provided with a first end face and a first mounting hole, and the first mounting hole passes through the shell from the first end face. The material of the nib is conductive plastic, and the nib includes a writing surface and a second end face arranged oppositely, the writing surface is a convex arc surface for writing, the second end face is arranged toward the first end face and connected to the first end face, the nib blocks the first mounting hole, and the hardness of the nib is less than the hardness of the mounting shell.

[0005] In the pen tip assembly of the present application, the mounting shell is an insulating shell with a high hardness, which can play the role of a support frame. The first end face of the mounting shell is connected to the second end face of the pen tip to fix the pen tip to the mounting shell. The hardness of the pen tip is relatively soft compared to the mounting shell and can be used for writing. The pen tip is made of conductive plastic and has conductive properties. When writing, the writing surface is directly in contact with the touch screen, and the charge can be directly conducted to the touch screen without signal loss, and better positioning can be achieved during the writing process. In addition, since the conductive plastic pen tip can directly contact the touch screen for writing, the thickness of the pen tip is not limited, and a high thickness setting can be achieved to improve the wear resistance of the pen tip.

[0006] In an optional implementation, the first end face and the second end face are both planes, and the first end face and the second end face are connected by pressing. In this structure, the first end face and the second end face are connected by plane fitting or bonding.

[0007] In an optional implementation, the first end face and the second end face both include a plane segment and a curved segment, and the first end face and the second end face are connected by the plane segment and the curved segment. In another optional low-stress connection structure, the first end face and the second end face are both curved surfaces, the first end face is a concave curved surface, and the second end face is a convex curved surface matched with the concave curved surface; or, the first end face is a convex curved surface, and the second end face is a concave curved surface matched with the convex curved surface. In another optional low-stress connection structure, the first end face is a first wavy curved surface, and the second end face is a second wavy curved surface matched with the first wavy curved surface. In each of the above possible low-stress connection structures, the first end face and the second end face are connected by bite and abutment at the same time, which can increase the abutment area between the first end face and the second end face, and increase the connection stability between the writing part and the mounting shell. Similarly, in this connection method, the abutment area between the first end face and the second end face is increased, which helps to improve the bonding strength between the two.

[0008] In an optional implementation, the pen tip includes a writing portion and a connecting portion, the connecting portion is connected to the writing portion, the connecting portion is inserted through the first mounting hole and is electrically connected to the refill of the stylus pen, and the writing portion is disposed outside the mounting shell. The connecting portion can be provided to achieve a fixed connection between the pen tip and the mounting shell, thereby enhancing the connection strength between the two.

[0009] In an optional implementation, the connection portion includes a connection column, and the connection column is connected to the first mounting hole by interference fit, bonding or threading. The connection column is made of conductive plastic, which has a certain elasticity and can be connected to the first mounting hole by interference fit, bonding or threading. The above connection method can facilitate the assembly and disassembly of the pen tip.

[0010] In an optional implementation, the connecting portion includes a connecting column and a positioning piece connected to the connecting column, and the positioning piece is connected to a partial shell of the mounting shell. By adding a positioning piece, the connection reliability between the connecting column and the first mounting hole can be strengthened, and the pen tip can be prevented from falling off from the mounting shell. Among them, in an optional implementation, the positioning piece includes a positioning piece, and the positioning piece is fixedly connected to the end of the connecting column away from the writing portion and is arranged outside the first mounting hole, and the outer diameter of the positioning piece is larger than the aperture of the first mounting hole. In this connection structure, the connecting column can be inserted into the first mounting hole, one end of the connecting column is connected to the writing portion, and the other end is connected to the positioning piece. The positioning piece is arranged outside the first mounting hole. The outer diameter of the positioning piece is larger than the aperture of the first mounting hole, and the connecting portion can be fixed in the first mounting hole, thereby strengthening the connection of the connecting portion and preventing the connecting portion from falling off from the first mounting hole.

[0011] In an optional implementation, the positioning member is a positioning ring, which is an annular protrusion formed by protruding outward from the peripheral side surface of part of the connecting column, and the inner wall of the first mounting hole is provided with an annular groove matching the annular protrusion, and the annular protrusion is arranged in the annular groove and is connected with the annular groove. In this connection method, the annular protrusion as the positioning ring is connected with the annular groove formed on the inner wall of the first mounting hole to provide resistance to prevent the connecting column from moving, thereby realizing the anti-detachment setting of the connecting part and enhancing the connection strength between the pen tip and the mounting shell.

[0012] In an optional implementation, the connecting portion is a cylindrical structure or a truncated cone structure or a combination of a cylindrical and a truncated cone structure. Wherein, when the connecting portion is a truncated cone structure, the outer diameter of the connecting portion gradually decreases from the writing portion to the connecting portion.

[0013] In an optional implementation, the Shore hardness of the pen tip is 75A to 95A, and the conductivity of the pen tip is 10 2.5 Ω~10 7.9 Ω, the damping force of the pen tip is 0.5~1.5N.

[0014] In an optional implementation, the mounting shell has a second mounting hole, the first mounting hole and the second mounting hole are arranged opposite to each other, and a cavity is provided between the first mounting hole and the second mounting hole, and the first mounting hole and the second mounting hole are both connected to the cavity. The first mounting hole is used to fix the connecting part, and the second mounting hole can be used to connect with the pen holder of the stylus pen. The connection between the pen core and the connecting part can be realized in the cavity.

[0015] In an optional implementation, the mounting shell is a conical structure, and the diameter of the first mounting hole is smaller than the diameter of the second mounting hole. The mounting shell has a conical shape, which is convenient for writing and avoids obstruction.

[0016] In an optional implementation, the material forming the pen tip includes a substrate and a conductive agent, and the mass proportion of the conductive agent in the pen tip is 10wt% to 30wt%; the substrate includes at least one of thermoplastic polyurethane elastomer, acrylonitrile-butadiene-styrene copolymer, and polyoxymethylene, and the conductive agent includes at least one of polyethylene terephthalate conductive fiber, carbon fiber, superconducting carbon black, carbon nanotubes or indium tin oxide.

[0017] In an optional implementation, the material forming the mounting shell includes polycarbonate, or a combination of polycarbonate and acrylonitrile-butadiene-styrene copolymer.

[0018] In an optional implementation, the connection surface between the pen tip and the mounting shell is a welding surface. The welding connection can avoid the use of additional connection structures, such as adhesives or processed threads, and the welding connection can also help the pen tip and the mounting shell form an integrated connection structure and increase the connection strength.

[0019] In a second aspect, the present application provides a method for preparing the pen tip assembly of the present application, comprising:

[0020] Placing a first injection molding material for forming a first structural component in a first injection molding mold, and performing injection molding at a first temperature to form the first structural component;

[0021] The first structural member and a second injection molding material for forming the second structural member are placed in the second injection molding mold, and the pen tip assembly is injection molded at a second temperature, wherein the first structural member is one of the pen tip or the mounting shell, and the second structural member is the other of the pen tip or the mounting shell; wherein the melting point of the first injection molding material is 30 to 80°C higher than the melting point of the second injection molding material, and the second injection molding temperature is lower than the first injection molding temperature.

[0022] In an optional implementation, the first structural member is a pen tip, and the second structural member is a mounting shell.

[0023] In a third aspect, the present application provides a composite material for preparing a pen tip, wherein the composite material is a conductive plastic, the Shore hardness of the composite material is 75A to 95A, and the conductivity of the composite material is 10 2.5 Ω~10 7.9 Ω, the damping force of the pen tip is 0.5~1.5N.

[0024] Among them, in one implementation, the composite material may include a substrate and a conductive agent, and the mass proportion of the conductive agent in the composite material is 10wt% to 30wt%; the substrate includes at least one of thermoplastic polyurethane elastomer, acrylonitrile-butadiene-styrene copolymer, and polyoxymethylene, and the conductive agent includes at least one of polyethylene terephthalate conductive fiber, carbon fiber, superconducting carbon black, carbon nanotubes or indium tin oxide.

[0025] In a fourth aspect, the present application provides a stylus pen comprising a pen barrel, a pen core and a pen tip of the present application, wherein the pen core is disposed in the pen barrel, a mounting shell of the pen tip is connected to the pen barrel, a writing part of the pen tip is electrically connected to the pen core, and the pen core is used to generate an electrical signal.

[0026] The refill is connected to the pen tip, and the refill is used to generate an electrical signal. The electrical signal generated by the refill is directly transmitted to the pen tip, and the writing surface of the pen tip is coupled with the touch screen. In this process, the writing surface is directly in contact with the touch screen, which reduces the charge loss and has a higher signal amount, so higher writing accuracy can be achieved.

[0027] The technical effects that can be achieved by the second to fourth aspects mentioned above can be described with reference to the corresponding effects in the first aspect mentioned above, and will not be repeated here.

[0028] Among them, the data in the above-mentioned possible implementation methods of the present application, such as the Shore hardness of the pen tip, the conductivity of the pen tip, the damping force of the pen tip, the mass percentage of the conductive agent, etc., when measuring, the values ​​within the scope of engineering measurement error should be understood as being within the scope specified in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the structure of an existing pen tip;

[0030] Figure 2 This is a schematic diagram of the structure of a stylus pen according to an embodiment of the present application;

[0031] Figure 3 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the disassembled structure of a pen tip assembly according to an embodiment of the present application;

[0033] Figure 5 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0034] Figure 6 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0035] Figure 7This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0036] Figure 8 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0037] Fig. 9 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0038] Fig.10 This is a schematic structural diagram of a pen tip assembly according to an embodiment of the present application;

[0039] Fig.11 This is a schematic cross-sectional structure diagram of a stylus pen according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 10-pen tip assembly; 11-mounting shell; 111-first mounting hole; 112-second mounting hole; 113-cavity; 114-first end surface;

[0042] 12-pen tip; 121-writing part; 122-connecting part; 123-writing surface; 124-second end surface; 125-positioning member;

[0043] 20-pen holder; 30-pen core; 40-conductive connector; 41-pin needle; 101-coating layer; 102-conductive electrode. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0045] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context.

[0046] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0047] With the development of touch technology, many electronic devices can be equipped with a stylus for touch input. A stylus is a pen-shaped input tool, an input device for electronic devices, used to input commands to a computer screen, mobile device, drawing tablet and other devices with a touch screen. Users can select files or draw by clicking the touch screen with the stylus. Figure 2 FIG. 1 is a schematic diagram of the structure of a stylus pen. Figure 2 As shown, the stylus generally includes components such as a pen barrel 20, a pen core 30 and a pen tip assembly 10, and may also include components such as a battery, an antenna, and a touch panel (not shown in the figure). Among them, the pen core 30 is arranged in the pen barrel 20 and can be used to generate an electrical signal, such as an electric charge.

[0048] Figure 3 FIG. 1 is a schematic diagram of the structure of a pen tip assembly. Figure 3 As shown, the pen tip assembly 10 includes a mounting shell 11 and a pen tip 12. The mounting shell 11 is used to fix the pen tip 12. Figure 2 The mounting shell 11 is connected to the pen barrel 20 of the stylus. The pen core 30 is electrically connected to the pen tip 12 to transmit the electrical signal to the pen tip 12. The pen tip 12 couples the electrical signal to the touch screen. The touch screen positions the stylus according to the coupled signal amount, thereby realizing functions such as file selection and drawing.

[0049] The structures of the mounting shell and the pen tip of the pen tip assembly are explained below.

[0050] Figure 4 FIG. 1 is a schematic diagram of the disassembled structure of the pen tip and the mounting shell of an embodiment. Figure 3 and Figure 4As shown, the outer shape of the mounting shell 11 can be a conical structural surface. Along the axial direction of the mounting shell 11, one end of the mounting shell 11 is provided with a first mounting hole 111, and the other end is provided with a second mounting hole 112. The caliber of the first mounting hole 111 can be smaller than the caliber of the second mounting hole 112. The first mounting hole 111 and the second mounting hole 112 are arranged opposite to each other, and a cavity 113 is provided between the two. The first mounting hole 111 and the second mounting hole 112 are both connected to the cavity 113. The cavity 113 can be used to accommodate a pen core. The first mounting hole 111 of the mounting shell 11 can be used to connect with the pen tip 12, and can also be used to penetrate the pen core, so that the pen core passes through the first mounting hole 111 and is electrically connected to the pen tip 12. The second mounting hole 112 is used to connect with the pen barrel 20. Among them, the connection between the second mounting hole 112 and the pen barrel 20 can be a variety of connection methods such as a snap connection, a threaded connection, or an interference fit connection.

[0051] Since the mounting shell 11 plays a role in mounting and fixing the pen tip 12, the mounting shell 11 has a certain hardness and needs to be insulated from the pen tip 12. Therefore, the mounting shell 11 can be made of a plastic material with a Shore hardness greater than or equal to 85D. In an optional embodiment, the material forming the mounting shell 11 includes polycarbonate (PC), or a combination of polycarbonate and acrylonitrile butadiene styrene (ABS).

[0052] like Figure 4 As shown, the mounting shell 11 has a first end surface 114, and the first end surface 114 can contact or abut the pen tip 12. Figure 3 The pen tip 12 includes a writing portion 121, and the writing portion 121 is provided with a second end surface 124 and a writing surface 123. The second end surface 124 is a surface connected to the first end surface 114. The first end surface 114 and the second end surface 124 can be a plane or a curved surface. The specific structure and connection relationship of the first end surface 114 and the second end surface 124 will be described later.

[0053] like Figure 3 and Figure 4 As shown, in the embodiment of the present application, the writing surface 123 is a convex arc surface. With the second end surface 124 of the writing portion 121 as a reference, the writing surface 123 protrudes from the second end surface 124 in a direction away from the housing 11 to form a convex arc surface, such as a parabola, a spherical surface or a spherical surface. Using a convex arc surface as the writing surface 123 can facilitate writing at various angles without damaging the touch screen. The structure of the writing portion 121 can be a mushroom head structure or a spherical crown structure, which can be a hollow structure or a solid structure. When it is a hollow structure, the wall thickness of the writing portion 121 can be greater than or equal to 2 mm to improve the wear resistance of the writing portion 121.

[0054] When writing, since the pen tip 12 needs to contact the touch screen to realize the writing function, the hardness of the pen tip 12 is relatively low compared to the hardness of the mounting shell 11, and can be made of a material with a Shore hardness greater than or equal to 75A and less than or equal to 95A. When the Shore hardness of the pen tip 12 is lower than 75A, the writing part 121 is too soft and the writing distance is short; when the hardness of the pen tip 12 is greater than 95A, the writing part 121 is not easy to be demolded, and the direct bonding force with the mounting shell 11 is poor.

[0055] In addition, the pen tip 12 of the embodiment of the present application has a conductive function, and when in contact with the touch screen, the electric signal can be directly coupled to the touch screen. Therefore, the pen tip 12 can be made of conductive plastic.

[0056] The conductive plastic material forming the pen tip 12 needs to have a relatively low hardness as well as a relatively high conductivity and a suitable damping force to satisfy the user's writing experience. 2.5 Ω~10 7.9 Ω, the damping force meets 0.5~1.5N.

[0057] As an exemplary illustration, the conductive plastic may include a substrate and a conductive agent, and the conductive agent is dispersed in the substrate. The substrate may be selected from at least one of thermoplastic urethane (TPU), acrylonitrile butadiene styrene (ABS), and polyformaldehyde (POM), and the conductive agent includes at least one of polyethylene terephthalate (PET) conductive fiber, carbon fiber, superconducting carbon black, carbon nanotubes, or indium tin oxide (ITO). It is understandable that in order to achieve the connection between the pen tip 12 and the mounting shell 11, the material of the pen tip 12 and the mounting shell 11 should be selected to have good connection compatibility, similar thermal expansion coefficients, and similar shrinkage rates.

[0058] The mass proportion of the conductive agent in the pen tip 12 can be, for example, 10wt% to 30wt%. When the mass proportion of the conductive agent is 10wt% to 30wt%, the amount of signal transmitted from the pen tip 12 to the electronic device remains basically unchanged. However, as the content of the conductive agent increases, the content of the substrate will decrease, and the substrate provides the main writing damping force in the writing part 121. The reduction in the content of the substrate will lead to a decrease in the friction resistance of the writing part 121, and a poor writing experience. Therefore, the proportion of the conductive agent needs to be in an appropriate range.

[0059] Continue to refer to Figure 3 and Figure 4In addition to the writing part 121, the pen tip 12 may also include a connecting part 122. The connecting part 122 and the writing part 121 may be made of the same conductive plastic to form an integrated connection structure. One end of the connecting part 122 is connected to the writing part 121, and the other end is used to connect to the mounting shell 11. For example, the connecting part 122 may be inserted into the first mounting hole 111 to achieve connection with the mounting shell 11. Figure 3 As shown, the connection portion 122 may include a connection column, which is inserted into the first mounting hole 111 and connected to the first mounting hole 111 by interference fit, thereby achieving a fixed connection between the connection portion 122 and the mounting shell 11. In addition to being connected to the first mounting hole 111 by interference fit, the connection column may also be connected by bonding or threading. The specific connection form between the connection column and the first mounting hole 111 is not limited.

[0060] Figure 5 It is a schematic structural diagram of a pen tip assembly of an embodiment. Figure 6 FIG. 1 is a schematic diagram of the structure of a pen tip assembly according to an embodiment of the present invention. Figure 5 and Figure 6 As shown, Figure 3 The difference from the illustrated embodiment is that the connection portion 122 may further include a positioning member 125 fixedly connected to the connection column, and the positioning member 125 is connected to a portion of the housing of the mounting shell 11, thereby enhancing the connection strength between the connection portion 122 and the mounting shell 11.

[0061] like Figure 5 As shown, the positioning member 125 can be a positioning piece provided at one end of the connecting column. The positioning piece is provided outside the first mounting hole 111 and in the cavity 113 of the mounting shell 11, and its diameter is larger than the aperture of the first mounting hole 111 to block the first mounting hole 111, so that the positioning piece is always fixed in the cavity 113, thereby preventing the connecting column from falling off from the first mounting hole 111.

[0062] In another embodiment, if Figure 6 As shown, the positioning member 125 is a positioning ring provided on the peripheral side of the connecting column. The positioning ring is an annular protrusion formed by protruding outward from the peripheral side of part of the connecting column. The inner wall of the first mounting hole 111 is provided with an annular groove matching the annular protrusion, and the annular protrusion is provided in the annular groove and connected with the annular groove so that the positioning ring is fixed in the annular groove inside the first mounting hole 111. In this connection structure, the positioning ring is connected to the mounting shell at the hole wall of the first mounting hole 111 to form an anti-slip structure of the connecting column to increase the connection strength between the connecting column and the mounting shell 11.

[0063] The connecting column may be a cylindrical structure, a truncated cone structure, or a combination of a cylindrical structure and a truncated cone structure. Figure 4 In an optional embodiment, the connecting column is a cylindrical structure. Accordingly, the first mounting hole 111 is a cylindrical hole. Figure 7 FIG. 2 is a schematic diagram of the structure of a pen tip in another embodiment. Figure 7 As shown, the connecting post is a truncated cone structure. From the writing portion 121 to the connecting post, the radial dimension of the connecting post gradually decreases.

[0064] above Figures 3 to 7 In the structure shown, the pen tip 12 can be connected to the mounting shell 11 through the connecting portion 122, and can also be connected to the mounting shell 11 through the writing portion 121. Among them, the side surface of the writing portion 121 used for connecting with the connecting portion 122 can be connected to the surface of the mounting shell 11 where the first mounting hole 111 is set. Among them, the side end surface of the mounting shell 11 facing the writing portion 121 is recorded as the first end surface 114, and the side end surface of the writing portion 121 facing the mounting shell 11 is recorded as the second end surface 124. The first end surface 114 and the second end surface 124 are attached and contacted, such as bonding or crimping.

[0065] Refer to Figures 3 to 7 The first end surface 114 and the second end surface 124 may both be planar structures, and the first end surface 114 and the second end surface 124 are press-fitted and connected. For example, the press-fitting connection may be achieved during an injection molding process.

[0066] During the writing process, the force applied by the touch screen to the writing portion 121 of the pen tip 12 is transmitted to the first end face 114 of the mounting shell 11 through the second end face 124 of the writing portion 121, thereby an interaction force exists between the first end face 114 and the second end face 124. When the force is large, the binding force between the two can be reduced, and even relative displacement between the two can occur. In order to increase the binding force between the first end face 114 and the second end face 124 and prevent the first end face 114 and the second end face 124 from relative slipping along the binding surface, the first end face 114 and the second end face 124 can be a non-planar structure.

[0067] Figure 8 FIG. 1 is a schematic diagram of the structure of a pen tip assembly according to an embodiment of the present invention. Figure 8 As shown, the first end face 114 includes a plane segment and a curved segment, and the second end face 124 also includes a plane segment and a curved segment. The first end face 114 and the second end face 124 fit together, wherein the plane segment of the first end face 114 fits together with the plane segment of the second end face 124, and the curved segment of the first end face 114 fits together with the curved segment of the second end face 124. If the curved segment of the first end face 114 is convex, the curved segment of the second end face 124 is concave. If the curved segment of the second end face 124 is concave, the curved segment of the first end face 114 is convex.

[0068] like Figure 8As shown, the curved surface section of the second end face 124 of the writing portion 121 may be arranged at the edge of the second end face 124. The curved surface section may be an annular flange formed along the edge of the second end face 124. The area between the annular flange and the connecting column may be a flat section. Correspondingly, the curved surface section of the first end face 114 of the mounting shell 11 may be located at the edge of the first end face 114. The curved surface section is an annular groove arranged along the edge of the first end face 114. The annular flange and the annular groove are connected to each other in a cooperative manner. When a sliding force along the bonding surface direction is generated between the first end face 114 and the second end face 124, the setting of the annular flange and the annular groove can prevent movement between the two, thereby enhancing the bonding strength between the first end face 114 and the second end face 124.

[0069] It is understandable that the curved surface section of the second end surface 124 can also be a convex tooth provided on the second end surface 124. Correspondingly, the first end surface 114 is provided with a groove matching the convex tooth. The convex tooth can be inserted into the groove, thereby realizing the bite connection structure of the first end surface 114 and the second end surface 124.

[0070] Fig. 9 A schematic structural diagram of a pen tip assembly according to another embodiment. Fig.10 FIG. 2 is a schematic diagram of the structure of a pen tip assembly in another embodiment. Fig. 9 and Fig.10 As shown, in the structure of the pen tip 12, the first end surface 114 and the second end surface 124 are both curved surfaces.

[0071] Reference Fig. 9 The first end surface 114 is a convex surface protruding toward the writing portion 121, and correspondingly, the second end surface 124 is a concave surface matching the convex surface. The convex surface of the first end surface 114 and the concave surface of the second end surface 124 match to form a concave-convex matching occlusal connection structure.

[0072] Reference Fig.10 The first end face 114 is a concave surface, and correspondingly, the second end face 124 is a convex surface protruding toward the mounting shell 11. The concave surface of the first end face 114 and the convex surface of the second end face 124 cooperate with each other to form a concave-convex fit occlusal connection structure.

[0073] In addition, when both the first end face 114 and the second end face 124 are curved surfaces, they can also be wavy curved surfaces. For example, the first end face 114 is a first wavy curved surface, and the second end face 124 is a second wavy curved surface that matches the first wavy curved surface. In addition, the first end face 114 and the second end face 124 can also be other irregular curved surface connection structures or multi-segment plane connection structures to achieve the occlusal connection between the first end face 114 and the second end face 124.

[0074] As described above, when the first end face 114 and the second end face 124 are non-planar connection structures, an occlusal connection structure may be formed between the two. When a force is formed between the first end face 114 and the second end face 124, the non-planar connection structure may disperse the stress between the first end face 114 and the second end face 124 in multiple directions, thereby avoiding slippage between the first end face 114 and the second end face 124.

[0075] Based on the same technical purpose, the present application also provides a method for preparing a pen tip assembly. The preparation method comprises the following steps:

[0076] S11, placing a first injection molding material for forming a first structural component in a first injection mold, and injection molding the first structural component at a first temperature;

[0077] S12. Place the first structural member and a second injection molding material for forming a second structural member in the second injection mold, and form the pen tip assembly by injection molding at a second temperature, wherein the first structural member is one of the pen tip and the mounting shell, and the second structural member is the other of the pen tip and the mounting shell.

[0078] The melting point of the first injection molding material is 30-80° C. higher than the melting point of the second injection molding material, and the second injection molding temperature is lower than the first injection molding temperature.

[0079] Taking the first structural member as a pen tip and the second structural member as a mounting shell as an example, the preparation method of the pen tip assembly of the embodiment of the present application includes:

[0080] S11, placing a first injection molding material for forming the pen tip 12 in a first injection molding mold, and injection molding the pen tip 12 at a first temperature;

[0081] S12, placing the pen tip 12 and a second injection molding material for forming the mounting shell 11 in the second injection mold, and injection molding the outer layer of the pen tip 12 at a second temperature to form the mounting shell 11, to obtain the pen tip assembly; wherein the melting point of the first injection molding material is 30 to 80°C higher than the melting point of the second injection molding material, and the second injection molding temperature is lower than the first injection molding temperature.

[0082] In the above-mentioned injection molding process, if the melting point of the first injection molding material is lower than that of the second injection molding material, when the second injection molding is performed, the structure of the pen tip has collapsed, and the two cannot be effectively connected. Therefore, the melting point of the first injection molding material must be higher than that of the second injection molding material, so that the pen tip can be softened to a certain extent at the second injection molding temperature, so that it can be bonded with the second injection molding material at the second injection molding temperature, so that the pen tip and the mounting shell have a certain connection strength. However, if the difference between the melting point of the first injection molding material and the melting point of the second injection molding material is too small, such as less than 30°C, at the second injection molding temperature, the pen tip formed by the first injection molding material is prone to excessive softening or melting, and cannot maintain the original structure. If the difference between the melting point of the first injection molding material and the second injection molding material is too large, such as greater than 80°C, the pen tip cannot soften during the second injection molding, thereby affecting the welding of the pen tip and the mounting shell and reducing the connection strength between the two.

[0083] The pen tip assembly of the present application will be further described in detail below in combination with specific embodiments and comparative examples.

[0084] Example 1

[0085] The pen tip assembly of this embodiment has a mounting shell made of PC with a Shore hardness of 90D. The pen tip is a combination of TPU and carbon fiber. The content of TPU is 70wt.%, the Shore hardness is 75A, and the content of carbon fiber is 30wt.%, and the Mohs hardness is 5-5.5.

[0086] Example 2

[0087] The pen tip assembly of this embodiment has a mounting shell made of PC with a Shore hardness of 90D. The pen tip is a combination of TPU and carbon fiber. The content of TPU is 80wt.%, the Shore hardness is 75A, and the content of carbon fiber is 20wt.%, and the Mohs hardness is 5-5.5.

[0088] Example 3

[0089] The pen tip assembly of this embodiment has a mounting shell made of PC with a Shore hardness of 90D. The pen tip is a combination of TPU and carbon fiber. The content of TPU is 90wt.%, the Shore hardness is 75A, and the content of carbon fiber is 10wt.%, and the Mohs hardness is 5-5.5.

[0090] Comparative Example 1

[0091] The pen tip assembly of this comparative example has a structure as follows Figure 1 As shown, it includes a conductive electrode 102 and an outer coating layer 101. The conductive electrode 102 is a metal electrode. The outer coating layer 101 is TPU. The thickness of the outer coating layer 101 is 0.3 mm.

[0092] The signal amount, writing life and writing resistance of the pen tip in different embodiments and comparative examples were tested respectively. The test results are listed in Table 1.

[0093] The signal quantity test method is as follows: the electronic pen draws a vertical line on the tablet end with a force of 100g and 5mm / s to read the signal quantity on the tablet end.

[0094] The test method for writing life is: the electronic pen draws a line vertically on the tablet end with a force of 200g and a speed of 150mm / s. The pen tip functions normally without bending, cracking, hardening or falling off.

[0095] The writing resistance test method is as follows: the electronic pen draws a vertical line on the tablet end with a force of 150g and 50mm / s to test the pen tip resistance.

[0096] Table 1

[0097] serial number semaphore Writing life Writing resistance Example 1 6520 20,000 meters 1.38N Example 2 6571 10,000 meters 1.21N Example 3 6763 5000m 1.46N Comparative Example 1 2677 3 20,000-meter 0.6N

[0098] It can be seen from the test data in Table 1 that since the pen tip of the embodiment of the present application is made of conductive material, it can be made into a writing part of any thickness and solidity as needed, without considering the thickness of the writing part. Therefore, the writing part of the present application is no longer limited by thickness, so as to significantly improve the writing life of the writing part. In addition, the pen tip is directly a conductive electrode, which directly contacts the touch screen for charge coupling during the writing process, and there is no signal loss in the coupling process. Therefore, the pen tip of Examples 1-3 of the present application has a much larger signal amount than the pen tip in Comparative Example 1, and the writing life is basically 3 times that of the pen tip in Comparative Example 1, and the writing resistance is also significantly improved, which is conducive to improving the writing experience.

[0099] Based on the same technical purpose, the present application also provides a composite material for preparing a pen tip. The composite material is a conductive plastic with a hardness of 75A to 95A and a conductivity of 10 2.5 Ω~10 7.9 Ω, damping force 0.5-1.5N. The composite material includes a substrate and a conductive agent, and the mass proportion of the conductive agent in the composite material is 10wt%-30wt%. The substrate includes at least one of thermoplastic polyurethane elastomer, acrylonitrile-butadiene-styrene copolymer, and polyoxymethylene, and the conductive agent includes at least one of polyethylene terephthalate conductive fiber, carbon fiber, superconducting carbon black, carbon nanotubes, or indium tin oxide.

[0100] Based on the same technical purpose, the present application also provides a stylus. Fig.11 FIG. 1 is a schematic diagram of a cross-sectional structure of a stylus pen. Fig.11As shown, the stylus pen includes a pen barrel 20, a pen core 30 and the pen tip assembly 10 of the present application, wherein the pen core 30 is arranged in the pen barrel 20, the mounting shell 11 of the pen tip assembly 10 is connected to the pen barrel 20, the writing part of the pen tip 12 is electrically connected to the pen core 30, and the pen core 30 is used to generate an electrical signal.

[0101] The pen core 30 and the pen tip 12 may be electrically connected directly or through a conductive connector. Fig.11 As shown, the stylus pen further includes a conductive connector 40. The conductive connector 40 is disposed in a cavity formed by the mounting shell 11. The pen core 30 and the pen tip 12 can be electrically connected via the conductive connector 40. The conductive connector 40 is a metal component, one end of which is connected to the pen core 30 and the other end is connected to the pen tip 12. A pin 41 may be provided at one end of the conductive connector 40 connected to the pen tip 12, and the pin 41 is connected to the pen tip 12, such as abutting. Figure 3 and Fig.11 When the pen tip 12 includes a writing part and a connecting part, the connecting part 122 passes through the first mounting hole 111 and abuts against the pin 41 of the conductive connecting member 40, and the other end of the conductive connecting member 40 is connected to the pen core 30. The electrical signal generated by the pen core 30 can be transmitted to the pen tip 12 through the conductive connecting member 40.

[0102] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pen tip assembly, characterized in that: The pen tip assembly is applied to a stylus pen, which is an input device of an electronic device, and includes: The mounting shell is an insulating shell, provided with a first end surface and a first mounting hole, wherein the first mounting hole passes through the shell from the first end surface; A pen tip, wherein the material of the pen tip is conductive plastic, the pen tip comprises a writing surface and a second end surface which are arranged opposite to each other, the writing surface is a convex arc surface for writing, and the second end surface is arranged toward the first end surface and connected to the first end surface; The pen tip blocks the first mounting hole, and the hardness of the pen tip is smaller than the hardness of the mounting shell.

2. The pen tip assembly according to claim 1, characterized in that: The first end surface and the second end surface are both planes, and the first end surface and the second end surface are pressed together or bonded.

3. The pen tip assembly according to claim 1 or 2, characterized in that: The first end surface and the second end surface both include a plane segment and a curved segment, and the first end surface and the second end surface are connected by the engagement of the plane segment and the curved segment.

4. The pen tip assembly according to claim 1 or 2, characterized in that: The first end surface and the second end surface are both curved surfaces, the first end surface is a concave curved surface, and the second end surface is a convex curved surface that cooperates with the concave curved surface; Or, the first end surface is a convex curved surface, and the second end surface is a concave curved surface matched with the convex curved surface; Alternatively, the first end surface is a first wavy curved surface, and the second end surface is a second wavy curved surface matching the first wavy curved surface.

5. The pen tip assembly according to any one of claims 1 to 4, characterized in that: The pen tip includes a writing part and a connecting part; the connecting part is connected to the writing part, the connecting part is passed through the first mounting hole and is electrically connected to the pen core of the stylus pen, and the writing part is arranged outside the mounting shell.

6. The pen tip assembly according to claim 5, characterized in that: The connecting portion includes a connecting column, and the connecting column is connected to the first mounting hole by interference fit, bonding or threading.

7. The pen tip assembly according to claim 5, characterized in that: The connecting portion includes a connecting column and a positioning member connected to the connecting column, and the positioning member is connected to a part of the shell of the mounting shell.

8. The pen tip assembly according to claim 7, characterized in that: The positioning member is a positioning piece, which is fixedly connected to an end of the connecting column away from the writing portion and arranged outside the first mounting hole. The radial dimension of the positioning piece is larger than the aperture of the first mounting hole.

9. The pen tip assembly according to claim 7, characterized in that: The positioning member is a positioning ring, which is an annular protrusion protruding outward from a portion of the peripheral side surface of the connecting column. The inner wall of the first mounting hole is provided with an annular groove matching the annular protrusion. The annular protrusion is arranged in the annular groove and is connected with the annular groove.

10. The pen tip assembly according to any one of claims 5 to 9, characterized in that: The connecting portion is a cylindrical structure.

11. The pen tip assembly according to any one of claims 5 to 9, characterized in that: The connecting portion is a truncated cone structure, and the outer diameter of the connecting column gradually decreases from the writing portion to the connecting portion.

12. The pen tip assembly according to any one of claims 1 to 11, characterized in that: The Shore hardness of the pen tip is 75A to 95A, and the conductivity of the pen tip is 10 2.5 Ω~10 7.9 Ω, the damping force of the pen tip is 0.5~1.5N.

13. The pen tip assembly according to any one of claims 1 to 12, characterized in that: The material forming the pen tip includes a substrate and a conductive agent, and the conductive agent accounts for 10wt% to 30wt% of the pen tip; The substrate includes at least one of thermoplastic polyurethane elastomer, acrylonitrile-butadiene-styrene copolymer, and polyoxymethylene, and the conductive agent includes at least one of polyethylene terephthalate conductive fiber, carbon fiber, superconducting carbon black, carbon nanotube, or indium tin oxide.

14. The pen tip assembly according to any one of claims 1 to 13, characterized in that: The connection surface between the pen tip and the mounting shell is a welding surface.

15. A method for preparing a pen tip assembly according to any one of claims 1 to 14, characterized in that: include: Placing a first injection molding material for forming a first structural component in a first injection molding mold, and performing injection molding at a first temperature to form the first structural component; The first structural member and a second injection molding material for forming the second structural member are placed in the second injection molding mold, and the pen tip assembly is injection molded at a second temperature, wherein the first structural member is one of the pen tip or the mounting shell, and the second structural member is the other of the pen tip or the mounting shell; wherein the melting point of the first injection molding material is 30 to 80°C higher than the melting point of the second injection molding material, and the second injection molding temperature is lower than the first injection molding temperature.

16. A composite material for a stylus pen tip, characterized in that: The composite material is a conductive plastic, the Shore hardness of the composite material is 75A to 95A, and the conductivity of the composite material is 10 2.5 Ω~10 7.9 Ω, the damping force of the pen tip made of the composite material is 0.5N to 1.5N.

17. The composite material according to claim 16, characterized in that The composite material includes a substrate and a conductive agent, wherein the mass proportion of the conductive agent in the composite material is 10wt% to 30wt%; the substrate includes at least one of thermoplastic polyurethane elastomer, acrylonitrile-butadiene-styrene copolymer, and polyoxymethylene, and the conductive agent includes at least one of polyethylene terephthalate conductive fiber, carbon fiber, superconducting carbon black, carbon nanotubes, or indium tin oxide.

18. A touch pen, characterized in that: It comprises a pen barrel, a pen core and a pen tip assembly as described in any one of claims 1 to 13, wherein the pen core is arranged in the pen barrel, the mounting shell of the pen tip assembly is connected to the pen barrel, the writing part of the pen tip is electrically connected to the pen core, and the pen core is used to generate an electrical signal.

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