Passive capacitive pen

Abstract

The application discloses a passive capacitive pen and relates to the technical field of capacitive pens. The passive capacitive pen comprises a pen body and a pen core assembly. The pen body is made of an insulating material and is provided with a mounting cavity. The front end of the pen body is provided with a pen mouth which is in communication with the mounting cavity. The pen core assembly comprises a guide piece, a pen core and a first conductive piece. The guide piece and the first conductive piece are arranged in the mounting cavity. The guide piece is provided with a guide hole. The pen core is made of a conductive material. One end of the pen core partially extends out of the pen mouth to form a pen head used for writing. The other end of the pen core passes through the guide hole and is connected with the first conductive piece. The pen head of the passive capacitive pen is more delicate, and the writing precision is higher. Meanwhile, the pen core is mounted in the pen body through the guide hole of the guide piece, so that the assembly is convenient and stable.

Description

Technical Field

[0001] This application relates to the field of capacitive pen technology, and in particular to a passive capacitive pen. Background Technology

[0002] With the widespread adoption and development of electronic devices, capacitive screens, as a common touch input device, have been widely used in smartphones, tablets, smart interactive whiteboards, and other electronic devices. To meet users' needs for writing, drawing, and other operations on capacitive screens, capacitive pens were developed.

[0003] In related technologies, passive capacitive pens are primarily integrated structures consisting of a pen tip and a pen body. This type of integrated capacitive pen is made entirely of conductive material, and its working principle involves capacitive coupling between the pen tip and the capacitive screen to achieve touch operation. When the pen tip touches the capacitive screen, it changes the capacitance distribution on the screen, and the capacitive screen detects this capacitance change to identify the pen tip's position.

[0004] However, due to its integrated design limitations, the stylus tip is usually relatively thick. When writing on a capacitive screen, the contact area between the stylus tip and the screen is larger, and the sensing area of ​​the capacitive screen is also correspondingly larger. This makes it difficult for the capacitive screen to accurately determine the specific position of the stylus tip, thus reducing the writing accuracy of the capacitive stylus. Summary of the Invention

[0005] This application provides a passive capacitive pen designed to improve the writing accuracy of the capacitive pen and enhance the writing experience.

[0006] To achieve the above objectives, this application provides a passive capacitive pen, including a pen body and a pen tip assembly. The pen body is made of an insulating material and has a mounting cavity. The front end of the pen body has a pen opening communicating with the mounting cavity. The pen tip assembly includes a guide, a pen tip, and a first conductive element. The guide and the first conductive element are disposed in the mounting cavity. The guide has a guide hole. The pen tip is made of a conductive material. One end of the pen tip extends out of the pen opening to form a pen tip for writing. The other end of the pen tip passes through the guide hole and is connected to the first conductive element.

[0007] In some embodiments, the inner diameter of the guide hole gradually decreases in the direction in which the pen refill extends away from the pen tip;

[0008] Alternatively, the pen body is a rotating structure, and the axis of the guide hole coincides with the axis of the mounting cavity;

[0009] Alternatively, the cross-section of the pen body is symmetrical, and the axis of the guide hole coincides with the center line of the mounting cavity.

[0010] In some embodiments, the pen body includes a mounting structure for mounting the guide member, the mounting structure including a stepped portion formed in the inner wall of the mounting cavity, the stepped portion for supporting the guide member, and the guide member abutting against the stepped portion.

[0011] In some embodiments, the mounting structure further includes a tapered guide portion formed on the inner wall of the mounting cavity, the tapered portion of the guide portion facing the stepped portion, for guiding the guide member to abut against the stepped portion.

[0012] In some embodiments, the guide member is cylindrical, the outer peripheral surface of the guide post fits against the inner wall of the mounting cavity, and the bottom surface of the guide member abuts against the stepped portion.

[0013] In some embodiments, the pen refill assembly further includes a second conductive element that is elastically deformable, which presses against the guide and the first conductive element and connects the pen refill and the first conductive element, respectively.

[0014] In some embodiments, the second conductive element is inserted into the pen refill, and the second conductive element abuts against the first conductive element.

[0015] In some embodiments, the second conductive element has a plug hole, and the pen refill is interference-fitted with the plug hole;

[0016] And / or, the pen refill portion passes through the connector hole.

[0017] In some embodiments, the first conductive element is a hollow cylindrical tube to avoid the portion of the pen refill passing through the insertion hole.

[0018] In some embodiments, the second conductive element is cylindrical, and the outer diameter of the second conductive element is not less than the outer diameter of the first conductive element.

[0019] In some embodiments, the pen lead includes a rigid needle and a writing part made of elastic material, the writing part being connected to one end of the needle and mounted at the pen tip.

[0020] In some embodiments, the writing part includes a first part and a second part connected together, the first part being mounted at the pen mouth, and the second part extending out of the pen mouth and covering the end face of the outer periphery of the pen mouth.

[0021] In some embodiments, the pen body further includes a mounting groove for mounting the writing part, the mounting groove connecting the mounting cavity and the pen tip, the pen tip being tapered in the direction toward the mounting groove to guide the first part to be mounted in the mounting groove.

[0022] In the passive capacitive pen provided in this application embodiment, the pen tip assembly is installed inside the pen body, and the pen tip extends out of the pen opening at the front end of the pen body to form the pen tip. Compared with the coarse pen tip of an integrated capacitive pen, the pen tip of this application is more refined, resulting in higher writing accuracy. Furthermore, when the capacitive pen is tilted on the writing surface, because the pen body is made of insulating material, it is less likely to change the electric field of the capacitive screen, avoiding interference with position recognition and thus improving the writing accuracy of the capacitive pen. In addition, the pen tip is installed inside the pen body through the guide hole of the guide component, making assembly convenient and stable. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a passive capacitive pen in the prior art;

[0025] Figure 2 This is a schematic diagram of the structure of a passive capacitive pen provided in an embodiment of this application;

[0026] Figure 3 This is an exploded view of the passive capacitive pen provided in an embodiment of this application;

[0027] Figure 4 for Figure 2 A cross-sectional view along the AA direction;

[0028] Figure 5 for Figure 2 A magnified view of a section at point B in the middle;

[0029] Figure 6 This is a schematic diagram of the pen refill structure provided in an embodiment of this application;

[0030] Figure 7 for Figure 2 A magnified view of a section at point C.

[0031] Explanation of icon numbers:

[0032] 1. Pen body; 11. Pen barrel; 12. End cap; 111. Mounting structure; 1111. Stepped section; 1112. Guide section; 2. Pen refill assembly; 21. Pen refill; 22. Guide component; 23. First conductive component; 24. Second conductive component; 211. Needle body; 212. Writing section; 2121. First part; 2122. Second part; 100. Mounting cavity; 200. Pen tip; 300. Guide hole; 400. Insertion hole; 500. Mounting groove; 600. Through hole.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In related technologies, such as Figure 1 As shown, passive capacitive pens generally adopt a one-piece structural design. These pens are typically made of conductive materials and can indeed interact with capacitive screens to a certain extent. However, this design has many significant drawbacks.

[0039] First, the unibody design often results in a relatively thick pen tip. When writing on a capacitive screen with such a thick tip, a series of problems arise. Firstly, the capacitive screen struggles to accurately recognize the pen tip's position. Even in normal writing mode, the thick tip already presents a challenge for position recognition. In actual use, users often hold the pen at different angles, exacerbating the problem when the pen is tilted against the writing surface. In this case, the pen body also comes into contact with or approaches the capacitive screen, altering its electric field. This change in electric field interferes with the screen's recognition of the pen tip's position, leading to inaccurate results and further affecting the pen's writing precision. This results in less smooth and accurate lines, especially during detailed writing or drawing, severely impacting the user experience.

[0040] Therefore, this application provides a passive capacitive pen to improve the writing accuracy of the passive capacitive pen and enhance the user experience.

[0041] Please see Figures 2 to 4 , Figure 2 This is a schematic diagram of the structure of a passive capacitive pen provided in an embodiment of this application; Figure 3 This is an exploded view of the passive capacitive pen provided in an embodiment of this application; Figure 4 for Figure 2 A cross-sectional view along the AA direction.

[0042] The passive capacitive pen of this embodiment includes a pen body 1 and a pen tip assembly 2. The pen body 1 is made of an insulating material, which can be a plastic with good insulating properties. The pen body 1 has a mounting cavity 100 and a pen tip 200. The mounting cavity 100 is a space for accommodating the pen tip assembly 2, and the pen tip 200 is located at the front end of the pen body 1 and communicates with the mounting cavity 100. Exemplarily, the pen body 1 includes a pen tube 11 and a tail cap 12 connected to the rear end of the pen tube 11. The pen tube 11 and the tail cap 12 cooperate to form the mounting cavity 100, and the pen tip 200 is located at the front end of the pen tube 11. The pen tube 11 can be a long, circular tube with a conical front end. The long, circular tube shape of the pen tube 11 makes it convenient for users to hold and use. At the same time, the conical front end of the pen tube 11 can reduce unnecessary obstruction of vision when writing close to the capacitive screen, providing users with a better writing field of view.

[0043] The pen refill assembly 2 is disposed in the mounting cavity 100, and includes a pen refill 21 and a first conductive element 23. The pen refill 21 is made of a conductive material, such as a highly conductive metal material, like copper or an alloy. One end of the pen refill 21 extends out of the pen opening 200 to form a pen tip for writing. Because the pen tip formed by the pen refill 21 is more refined than the thick pen tip of a traditional integrated capacitive pen, it allows for more precise control of the writing position and strokes when writing on a capacitive screen, greatly improving writing accuracy and thus enhancing the user's writing experience when drawing intricate patterns or writing small characters. The other end of the pen refill 21 is connected to the first conductive element 23. The connection method can be welding, threaded connection, or abutment, to ensure a good electrical connection between the pen refill 21 and the first conductive element 23, so that the electrical signal can be transmitted stably during the writing process. The first conductive element 23 is disposed in the mounting cavity 100, with one end connected to the pen refill 21 and the other end connected to the tail cap 12 of the pen body 1. For example, one end of the first conductive element 23 is electrically connected to the pen refill 21, and the other end abuts against the tail cap 12. Optionally, the outer wall of the first conductive element 23 is fitted to the inner wall of the mounting cavity 100 to reduce the distance between the first conductive element 23 and the human body when the human body holds the capacitive pen, thereby increasing the capacitance formed between the first conductive element 23 and the human body and improving the stability of electrical signal transmission.

[0044] In this embodiment, the pen body 1 is made of insulating material. When the capacitive pen is in use, especially when it is in contact with the capacitive screen at an angle, the insulating material does not conduct electricity and will not change the electric field of the capacitive screen like the conductive pen body of a traditional integrated passive capacitive pen. This avoids position recognition errors caused by the interference of the pen body 1 with the electric field of the capacitive screen, thereby effectively improving the writing accuracy of the capacitive pen.

[0045] The pen refill 21 in this embodiment is a crucial component for the operation of the capacitive pen, and it is inherently delicate and easily bent. Therefore, ensuring the stability and ease of installation of the pen refill 21 within the pen body 1 is particularly important. To this end, the pen refill assembly 2 in this embodiment also includes a guide member 22. The guide member 22 has a guide hole 300 through which the end of the pen refill 21 furthest from the pen tip passes to connect to the first conductive element 23. The function of the guide member 22 is to provide accurate installation position and directional guidance for the pen refill 21. Through the guide hole 300, the pen refill 21 can be stably installed within the pen body 1, preventing it from easily shaking or shifting during use, thus facilitating installation. For example, please refer to... Figure 5 , Figure 5 for Figure 2The enlarged view at point B shows that the inner diameter of the guide hole 300 gradually decreases in the direction the pen refill 21 extends away from the pen tip. The gradual inner diameter design of the guide hole 300 can be a smooth transition; for example, the guide hole 300 can be tapered, with the taper determined by factors such as the material, length, and diameter of the pen refill 21, such as a 30° taper. From the end closer to the pen tip to the end further away, the inner diameter of the guide hole 300 gradually decreases, forming a funnel-like shape, and its inner wall is smooth to reduce friction on the pen refill 21. When installing the pen refill 21, the end with the larger inner diameter is closer to the pen tip, facilitating initial insertion. The operator can easily insert the pen refill 21 into the guide hole 300 from this end without needing to precisely align it with a very small hole, reducing installation difficulty. As the pen refill 21 is inserted further away from the pen tip, the gradually decreasing inner diameter of the guide hole 300 provides increasingly stronger positioning and clamping effects for the pen refill 21. This makes the installation of the pen refill 21 within the guide hole 300 more stable, preventing radial wobble during use and ensuring that writing accuracy is not affected. Moreover, this gradient inner diameter design can accommodate pen refills 21 with different diameter error ranges, improving the error tolerance in the production process and reducing production costs.

[0046] In one embodiment, the pen body 1 is a solid of revolution. A solid of revolution refers to a closed geometric body formed by rotating a planar figure around a fixed straight line (the axis of the solid of revolution) within its plane. Common solids of revolution, such as cylinders and cones, can be used as the structure of the pen body 1 in this embodiment. Taking a cylinder as an example, it is formed by rotating a rectangle around one of its sides. In the pen body with a solid of revolution structure, the shape of the mounting cavity 100 is also a solid of revolution shape, and the axis of the guide hole 300 coincides with the axis of the mounting cavity 100. It is understood that the coincidence of the axis of the guide hole 300 and the axis of the mounting cavity 100 does not mean that the guide hole 300 is perfectly centered within the pen body 1, but rather that there can be a certain range of deviation. During the manufacturing process, the coincidence can be ensured through precise machining techniques. In this embodiment, the coincidence of the axis of the guide hole 300 and the axis of the mounting cavity 100 ensures that the pen refill 21 remains in the center position of the pen body 1 during installation and use. From an installation perspective, when the pen tip 21 is inserted into the guide hole 300, since the guide hole 300 coincides with the axis of the mounting cavity 100, the operator can more easily align and insert the pen tip 21, reducing the difficulty and time cost of installation. Furthermore, when writing with a capacitive pen, the pen tip 21 will not experience uneven external forces due to eccentricity, thus ensuring writing stability. For example, when writing straight lines, the pen tip 21 will not deviate from the center, preventing the strokes from bending or becoming uneven in thickness, greatly improving writing accuracy.

[0047] In another embodiment, the pen body 1 has a symmetrical cross-section, which can take many forms. For example, an ellipse is a symmetrical shape, with its major and minor axes dividing it into four symmetrical parts. When the pen body 1 has an elliptical cross-section, it possesses a unique aesthetic appeal, and the curvature of the ellipse provides a comfortable grip for the user. Additionally, regular polygons (such as squares and hexagons) are also common symmetrical cross-sectional shapes. Taking a square as an example, its four sides are equal and its four angles are right angles; this shape is more stable when placed and less prone to rolling.

[0048] When the pen body 1 has a symmetrical cross-section, the axis of the guide hole 300 coincides with the center line of the mounting cavity 100. For a pen body 1 with an elliptical cross-section, the center line of the mounting cavity 100 is a straight line passing through the center of the ellipse and perpendicular to the cross-section, and the axis of the guide hole 300 coincides with it. For a pen body 1 with a regular polygonal cross-section, the center line of the mounting cavity 100 is a straight line passing through the center of the regular polygon and perpendicular to the cross-section, and it also coincides with the axis of the guide hole 300. In this way, the pen refill 21 can be installed and operate within the pen body 1 along the direction of the center line of the mounting cavity 100.

[0049] like Figure 5 As shown, in some embodiments, the pen body 1 includes a mounting structure 111 for mounting the guide member 22. The mounting structure 111 includes a stepped portion 1111 formed on the inner wall of the mounting cavity 100. The stepped portion 1111 can be an annular platform structure surrounding a specific position on the inner wall of the mounting cavity 100, which can be determined according to the length of the pen refill 21. During manufacturing, the flatness and concentricity of the stepped portion 1111 with the mounting cavity 100 can be ensured through a precise mold forming process. The main function of the stepped portion 1111 is to support the guide member 22, providing a stable support plane for the guide member 22. When the guide member 22 is installed, its bottom surface can be placed stably on the stepped portion 1111, thereby determining the position of the guide member 22 in the axial direction of the pen body 1.

[0050] The mounting structure 111 also includes a tapered guide portion 1112, with the tapered portion facing the stepped portion 1111. This tapered guide portion 1112 is integrally formed with the inner wall of the mounting cavity 100, and its tapered angle is designed according to the dimensions of the guide member 22; for example, the tapered angle can be selected within the range of 15°-30°. During the installation of the guide member 22, the tapered guide portion 1112 plays a guiding role. When the guide member 22 is inserted into the mounting cavity 100, the tapered guide portion 1112 guides the guide member 22 to accurately abut against the stepped portion 1111. This guiding effect is similar to the principle of a funnel, allowing the guide member 22 to automatically align with the stepped portion 1111, reducing the difficulty of manual alignment during installation and greatly improving the convenience of installation.

[0051] Furthermore, the guide member 22 is cylindrical to ensure a tight fit with the mounting structure 111 of the pen body 1. The outer peripheral surface of the guide post conforms to the inner wall of the mounting cavity 100 to ensure the radial position of the guide member 22 within the mounting cavity 100 is stable and does not wobble. Simultaneously, the bottom surface of the guide member 22 abuts against the stepped portion 1111; the bottom surface of the guide member 22 is a plane for abutting against the stepped portion 1111.

[0052] When installing the guide member 22, the cylindrical guide member 22 is first placed into the mounting cavity 100. Due to the presence of the tapered guide portion 1112, the guide member 22 gradually moves along the tapered surface towards the step portion 1111. When the bottom surface of the guide member 22 contacts the step portion 1111, the installation is complete. This installation method is very convenient, and the operator can complete the installation without using complicated tools or making fine adjustments. Moreover, due to the synergistic effect of the step portion 1111 and the tapered guide portion 1112, the axis of the guide member 22 is ensured to be aligned with the axis of the pen body 1. Since the axis of the guide member 22 is aligned with the axis of the pen body 1, when the pen refill 21 passes through the guide hole 300 of the guide member 22 and the pen refill 21 is connected to the first conductive element 23, the axes of the pen refill 21, the conductive element, and the pen body 1 remain aligned. The coaxiality of the pen refill 21, the conductive element, and the pen body 1 plays a crucial role in writing accuracy. During writing, good coaxiality ensures that the pen tip 21 is subjected to uniform force in all directions, preventing unstable contact between the pen tip and the capacitive screen due to eccentricity. For example, when writing intricate patterns or small characters, it ensures the continuity and accuracy of strokes, improving writing precision and quality, and providing users with a superior writing experience.

[0053] Please continue reading Figure 5 To improve the ease of installation of the first conductive element 23 and the stability of signal transmission in the pen refill assembly 2, this embodiment also includes a second conductive element 24. Specifically, the pen refill assembly 2 includes an elastically deformable second conductive element 24. The second conductive element 24 has good elastic deformation capability. In this embodiment, a conductive material with a suitable elastic modulus, such as conductive silicone, can be selected. The second conductive element 24 presses against the guide element 22 and the first conductive element 23, and connects the pen refill 21 and the first conductive element 23 respectively, so that the second conductive element 24 plays a key role in the signal transmission path of the pen refill assembly 2.

[0054] Specifically, the second conductive element 24 is inserted into the pen refill 21, specifically, the end of the pen refill 21 furthest from the writing end is inserted into the second conductive element 24. For example, the pen refill 21 can be directly inserted into the flexible second conductive element 24, or the second conductive element 24 can have a socket for the pen refill 21 to be inserted. For example, the second conductive element 24 has a socket 400, and the pen refill 21 is interference-fitted with the socket 400. This interference fit design ensures that after the pen refill 21 is inserted into the socket 400, there is a certain pressure between the two, thus guaranteeing a tight connection. This tight connection ensures that during the use of the capacitive pen, even when affected by external forces such as vibration or changes in writing pressure, the connection between the pen refill 21 and the second conductive element 24 remains stable. From the perspective of signal transmission, when the pen tip (i.e. the writing end of the pen core 21) contacts the capacitive screen to generate an electrical signal, the electrical signal can be stably transmitted from the pen core 21 to the second conductive element 24 without problems such as signal interruption or signal attenuation caused by loose connection. This ensures the stability of signal transmission, thereby improving the accuracy and reliability of capacitive pen writing and providing users with a smoother and more accurate writing experience.

[0055] Furthermore, the insertion hole 400 of the second conductive component 24 is aligned with the guide hole 300 of the conductive component. Thus, during assembly, the operator can directly insert the pen refill 21 into the insertion hole 400 through the guide hole 300. Because the guide hole 300 provides accurate insertion direction guidance for the pen refill 21, it allows the pen refill 21 to be smoothly aligned and inserted into the insertion hole 400, thereby greatly improving the ease of installation of the pen refill 21.

[0056] Furthermore, the pen tip 21 passes through the insertion hole 400, making the second conductive element 24 closer to the middle of the pen tip 21, thereby reducing the torque on the pen tip 21 and preventing it from bending due to external interference during the use of the capacitive pen, thus improving the stability of the connection between the pen tip 21 and the second conductive element 24.

[0057] The second conductive element 24 abuts against the first conductive element 23. The first conductive element 23 is a hollow cylindrical tube, which not only greatly reduces the weight of the capacitive pen but also avoids the portion of the pen lead 21 passing through the insertion hole 400, preventing the pen lead 21 from colliding with and being damaged by the first conductive element 23 when it is inserted into the second conductive element 24. The second conductive element 24 is cylindrical, and its outer diameter is not less than that of the first conductive element 23. When the first conductive element 23 abuts against the second conductive element 24, the outer diameter of the second conductive element 24 is not less than that of the first conductive element 23, making it easier for the first conductive element 23 to abut against the second conductive element 24. This facilitates the installation of the first conductive element 23 and ensures good electrical contact between the two, which is beneficial for stable signal transmission.

[0058] During the assembly of the pen refill assembly 2, one end of the first conductive element 23 abuts against the second conductive element 24, while the other end is pressed tightly by the tail cap 12. The pressing force of the tail cap 12 on the first conductive element 23 is transmitted to the second conductive element 24 through the first conductive element 23, ensuring that the entire pen refill assembly 2 is in a stable state within the pen body 1. This not only ensures the fixation of each component in its physical position but, more importantly, ensures stable signal transmission. From a signal transmission perspective, when the pen tip contacts the capacitive screen, the generated electrical signal is transmitted through the pen refill 21 to the second conductive element 24, and then further transmitted through the first conductive element 23, which is tightly abutting against the second conductive element 24. The stable connection structure throughout the process avoids signal loss and interference, thereby improving the writing accuracy and performance of the capacitive pen.

[0059] Please see Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the pen refill 21 provided in an embodiment of this application; Figure 7 for Figure 2 A magnified view of a section at point C.

[0060] In some embodiments, the pen lead 21 includes a rigid needle 211 and a writing part 212 made of elastic material. The writing part 212 is connected to one end of the needle 211 and installed at the pen tip 200. The pen lead 21 in this embodiment adopts a combined rigid and flexible structural design. On one hand, the rigid needle 211 provides the necessary support strength for the pen lead 21, ensuring that the pen lead 21 will not easily bend or deform during writing, thus maintaining writing stability. For example, the needle 211 can be made of a metal material such as stainless steel, whose hardness is sufficient to withstand the pressure and friction during writing. On the other hand, the writing part 212 is made of a soft, elastic material, such as conductive rubber or a soft conductive polymer. This elastic material has good elastic deformation capability and can undergo slight deformation when in contact with the capacitive screen. When the capacitive pen is writing normally, the writing part 212 contacts the capacitive screen, and due to its elasticity, a certain deformation occurs at the contact point. This deformation can increase the contact area with the capacitive screen. Compared to traditional hard pen refills, the increased contact area significantly increases capacitance change, thereby improving electrical signal strength. This allows the capacitive screen to detect pen operation more sensitively, resulting in smoother writing.

[0061] Furthermore, the writing section 212 includes a first part 2121 and a second part 2122 connected together. The first part 2121 is installed at the pen tip 200 and plays a connecting role in the entire pen refill 21 structure, tightly connecting the pen refill 21 to the pen tip 200 of the pen body 1. The design of the first part 2121 matches the structure of the pen tip 200. For example, it can have an outer diameter adapted to the inner diameter of the pen tip 200. It is fixed to the pen tip 200 by interference fit, glue bonding or other suitable connection methods, thereby ensuring the stability of the pen refill 21 within the pen body 1 and preventing the pen refill 21 from shaking or shifting relative to the pen body 1 during writing, thus ensuring the accuracy and smoothness of writing.

[0062] The second part 2122 of the writing section 212 extends out of the pen tip 200 and covers the outer periphery of the pen tip 200 to form a pen tip for writing. As the part that directly contacts the capacitive screen, the second part 2122 undergoes a slight deformation when it comes into contact with the capacitive screen due to the properties of its elastic material. This slight deformation increases the contact area with the capacitive screen. The increased contact area significantly increases the capacitance change between the capacitive screen and the writing section 212, thereby improving the electrical signal strength. The capacitive screen can more sensitively detect the operation of the capacitive pen, and the writing sensitivity is greatly improved.

[0063] Furthermore, when writing with the capacitive stylus at an angle, the stylus tip 200 of the stylus body 1 risks approaching or contacting the capacitive screen. However, in this embodiment, since the second part 2122 of the writing section 212 covers the end face of the stylus tip 200, in this situation, it is the second part 2122, rather than the insulating stylus tip 200, that first contacts the capacitive screen. This effectively avoids errors caused by the stylus tip 200 contacting the capacitive screen, ensuring writing stability and accuracy, and providing users with a good writing experience at different writing angles.

[0064] To further improve the ease of pen refill installation, this embodiment provides a mounting groove 500 at the pen opening 200 of the pen body 1. Specifically, the pen body 1 includes a mounting groove 500 for mounting the writing part 212, and the mounting groove 500 connects the mounting cavity 100 and the pen opening 200. For example, the bottom of the mounting groove 500 is provided with a through hole 600, which connects the mounting groove 500 to the mounting cavity 100, allowing the pen refill 21 to be installed by passing through the through hole 600.

[0065] The pen tip 200, serving as the opening of the mounting slot 500, is tapered in the direction of the mounting slot 500. This tapered design of the pen tip 200 significantly guides the installation of the first part 2121 of the writing unit 212. Specifically, when beginning to install the first part 2121 of the writing unit 212, due to the shape of the tapered pen tip 200, the first part 2121 only needs to be roughly aligned with the pen tip 200. The tapered surface generates a gradually converging force on the first part 2121, allowing it to smoothly enter the mounting slot 500 along the tapered surface. This improves the ease of installation of the writing unit 212.

[0066] Furthermore, the axis of the mounting groove 500 coincides with the axis of the guide hole 300. During manufacturing, this axis alignment precision can be ensured through high-precision mold processing and accurate assembly techniques. When installing the pen refill 21, as the writing part 212 of the pen refill 21 is aligned with the mounting groove 500, because the axis of the mounting groove 500 coincides with the axis of the guide hole 300, the needle 211 of the pen refill 21 simultaneously inserts into the insertion hole 400 of the second conductive element 24 along the guide hole 300. This is a synchronous and automatic alignment process; the operator only needs a simple pushing motion to simultaneously complete the installation of the writing part 212 in the mounting groove 500 and the insertion of the needle 211 into both the guide hole 300 and the insertion hole 400. This avoids the cumbersome steps of separately aligning the writing part 212 and the needle 211 in the traditional installation method, significantly reducing installation time and labor intensity. Moreover, because the installation process is more accurate and stable, it reduces problems such as pen tip wobbling and poor contact that may be caused by improper installation, thus improving the overall quality and writing performance of the capacitive pen and providing users with a more reliable product.

[0067] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A passive capacitive pen, characterized in that, include: The pen body is made of insulating material and has a mounting cavity. The front end of the pen body has a pen opening that communicates with the mounting cavity. as well as A pen refill assembly includes a guide, a pen refill, and a first conductive element. The guide and the first conductive element are disposed in the mounting cavity. The guide has a guide hole. The pen refill is made of a conductive material. One end of the pen refill extends out of the pen opening to form a pen tip for writing. The other end of the pen refill passes through the guide hole and is connected to the first conductive element.

2. The passive capacitive pen according to claim 1, characterized in that, The inner diameter of the guide hole gradually decreases in the direction in which the pen refill extends away from the pen tip; Alternatively, the pen body is a rotating structure, and the axis of the guide hole coincides with the axis of the mounting cavity; Alternatively, the cross-section of the pen body is symmetrical, and the axis of the guide hole coincides with the center line of the mounting cavity.

3. The passive capacitive pen according to claim 2, characterized in that, The pen body includes a mounting structure for mounting the guide member. The mounting structure includes a stepped portion formed on the inner wall of the mounting cavity. The stepped portion is used to support the guide member, and the guide member abuts against the stepped portion.

4. The passive capacitive pen according to claim 3, characterized in that, The mounting structure further includes a tapered guide portion formed on the inner wall of the mounting cavity, the tapered portion of the guide portion facing the stepped portion, for guiding the guide member to abut against the stepped portion.

5. The passive capacitive pen according to claim 3 or 4, characterized in that, The guide member is cylindrical, with its outer circumferential surface fitting against the inner wall of the mounting cavity, and its bottom surface abutting against the stepped portion.

6. The passive capacitive pen according to claim 1, characterized in that, The pen refill assembly further includes a second conductive element that is elastically deformable. The second conductive element presses against the guide and the first conductive element, and connects the pen refill and the first conductive element respectively.

7. The passive capacitive pen according to claim 6, characterized in that, The second conductive element is inserted into the pen refill, and the second conductive element abuts against the first conductive element.

8. The passive capacitive pen according to claim 7, characterized in that, The second conductive element has a plug hole, and the pen refill is interference-fitted with the plug hole; Or, the pen tip portion passes through the connector hole.

9. The passive capacitive pen according to claim 8, characterized in that, The first conductive element is a hollow cylindrical tube to avoid the portion of the pen refill passing through the insertion hole.

10. The passive capacitive pen according to claim 9, characterized in that, The second conductive element is cylindrical, and the outer diameter of the second conductive element is not less than the outer diameter of the first conductive element.

11. The passive capacitive pen according to claim 1, characterized in that, The pen refill includes a rigid needle and a writing part made of elastic material. The writing part is connected to one end of the needle and is installed at the pen tip.

12. The passive capacitive pen according to claim 11, characterized in that, The writing section includes a first part and a second part connected together. The first part is installed at the pen mouth, and the second part extends out of the pen mouth and covers the end face of the outer periphery of the pen mouth to form a pen tip for writing.

13. The passive capacitive pen according to claim 13, characterized in that, The pen body also includes a mounting groove for mounting the writing part, the mounting groove connecting the mounting cavity and the pen tip, the pen tip being tapered in the direction toward the mounting groove to guide the first part to be mounted in the mounting groove.

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