Stylus device and refill structure

Abstract

The present invention discloses a stylus device and a refill structure. The refill structure includes a support unit, a core unit and a protective shell unit. One end of the support unit extends outward to form a joint, and the body of the support unit is used to connect with the pen body structure of the stylus device. One end of the core unit has a contact portion, and the other end of the core unit is recessed toward one end of the core unit to form a receiving portion, and the core unit receives the joint through the receiving portion to be sleeved on the joint. The contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65 mm and 1.25 mm. The protective shell unit covers the core unit and the joint and exposes the contact portion. Therefore, the stylus device and the refill structure of the present invention have a long service life, can provide users with a good operating feel, and can avoid damage to the touch screen.

Description

Technical Field

[0001] The present invention relates to the technical field of styluses, and more particularly to a stylus device and a refill structure that are durable, provide a good feel, and do not damage a screen. Background Art

[0002] With the advancement of technology, the pace of electronic product innovation is accelerating. Touchscreen-equipped electronic products, such as tablets and smartphones, have become a major trend and mainstream feature of today's technology. Most users use their fingers to tap and swipe on the touchscreen. However, prolonged writing, drawing, or detailed manipulation on the touchscreen can be difficult with fingers. Consequently, many users purchase styluses to operate touchscreens.

[0003] However, the contact end (i.e., the pen tip) of the existing stylus refill is designed to be relatively sharp. Therefore, when a user uses the contact end of the stylus refill to operate a touch screen, the contact end of the stylus refill is prone to excessive sliding on the touch screen, resulting in a poor operating feel for the user. In addition, the contact end of the stylus refill is also prone to damaging the surface of the touch screen, causing damage to the touch screen.

[0004] Moreover, the contact end of the existing stylus refill is a hollow conductive rubber, which is not only very easy to deform and break, making it very durable, but also, after the refill touches the touch screen, the contact end will deform as long as the user applies light pressure, resulting in poor sensitivity.

[0005] Therefore, how to overcome the above-mentioned defects through structural design improvements has become one of the important issues to be solved in this field. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a stylus device and a pen core structure to address the deficiencies of the prior art.

[0007] In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a stylus device, which includes a pen body structure and a pen core structure. The pen core structure is arranged at one end of the pen body structure, and the pen core structure includes a support unit, a core unit and a shell unit. One end of the support unit extends outward to form a joint, and the body of the support unit is used to connect with one end of the pen body structure. One end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65mm and 1.25mm. The protective shell unit is a hollow conical structure, which covers the core unit and the joint and exposes the contact part. The protective shell unit has a top surface and a bottom surface that are relatively arranged. The top surface and the contact part are in contact with each other. A part of the bottom surface is recessed toward the top surface to form a recessed part, and the center of the recessed part overlaps with the central axis of the protective shell unit.

[0008] In order to solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a refill structure, which includes a support unit, a core unit, and a protective shell unit. One end of the support unit extends outward to form a joint, and the main body of the support unit is used to connect with the pen body structure of the stylus device. One end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form a receiving portion. The core unit receives the joint through the receiving portion and is sleeved on the joint; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65mm and 1.25mm. The protective shell unit is a hollow conical structure, which covers the core unit and the joint and exposes the contact portion. The protective shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, and a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the protective shell unit.

[0009] One of the beneficial effects of the present invention is that the stylus pen device and the pen core structure provided by the present invention can improve the service life through the technical solution of "one end of the support unit extends outward to form a joint portion, the main body of the support unit is used to connect with the pen body structure of the stylus pen device. One end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65mm and 1.25mm. The shell unit is a hollow conical structure, the shell unit covers the core unit and the joint portion and exposes the contact portion, the shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the shell unit."

[0010] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 1 is a perspective schematic diagram of a stylus device according to a first embodiment of the present invention.

[0012] Figure 2 FIG. 1 is an exploded schematic diagram of a stylus device according to a first embodiment of the present invention.

[0013] Figure 3 FIG. 1 is a partial exploded diagram of a stylus device according to a first embodiment of the present invention.

[0014] Figure 4 Schematic diagram of the structure of the pen core according to the first embodiment of the present invention.

[0015] Figure 5 Schematic cross-sectional view of the pen core structure according to the first embodiment of the present invention.

[0016] Figure 6 Schematic diagram of the exploded structure of the pen core according to the first embodiment of the present invention.

[0017] Figure 7 FIG1 is a perspective diagram of the refill structure according to the first embodiment of the present invention from one viewing angle.

[0018] Figure 8 FIG. 1 is a perspective diagram of the refill structure of the first embodiment of the present invention from another perspective.

[0019] Figure 9 FIG. 1 is a schematic diagram of the stylus device in use according to the first embodiment of the present invention.

[0020] Figure 10 FIG. 1 is a first side view schematic diagram of a stylus device according to a first embodiment of the present invention.

[0021] Figure 11 FIG. 1 is a second side view of the stylus device according to the first embodiment of the present invention.

[0022] Figure 12 FIG. 4 is a third side view of the stylus device according to the first embodiment of the present invention.

[0023] Figure 13 FIG. 4 is an exploded schematic diagram of a stylus device according to a second embodiment of the present invention.

[0024] Figure 14 Schematic diagram of the structure of the pen core according to the second embodiment of the present invention.

[0025] Figure 15 Schematic cross-sectional view of the pen core structure according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following is an explanation of the implementation of the "stylus pen device and refill structure" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, it should be stated in advance that the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual size. The following embodiments will further explain the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0027] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components, these components should not be limited by these terms. These terms are primarily used to distinguish one component from another. In addition, the term "or" as used herein may include any one or more combinations of the associated listed items, depending on the actual situation.

[0028] First embodiment

[0029] See also Figures 1 to 12, which are respectively a three-dimensional schematic diagram of the stylus device of the first embodiment of the present invention, an exploded schematic diagram of the stylus device, a partially exploded schematic diagram of the stylus device, a structural schematic diagram of the refill structure, a cross-sectional schematic diagram of the refill structure, an exploded schematic diagram of the refill structure, a three-dimensional schematic diagram of the refill structure from one perspective, a three-dimensional schematic diagram of the refill structure from another perspective, a schematic diagram of the stylus device in use, a first side view schematic diagram of the refill structure, a second side view schematic diagram of the refill structure, and a third side view schematic diagram of the refill structure. Figure 1 and Figure 2 As shown, a first embodiment of the present invention provides a stylus device D comprising a body structure 1 and a core structure 2. The stylus device D can be a capacitive stylus or other type of stylus, and can be used with an electronic device E (such as, but not limited to, a smartphone, tablet computer, or touch-screen notebook computer) having a touch screen E1. That is, the stylus device D can operate the electronic device by contacting the touch screen.

[0030] Next, cooperate Figures 1 to 6 As shown, the refill structure 2 is disposed at one end of the pen body structure 1 and includes a support unit 20, a core unit 21, and a protective shell unit 22. The stylus device D may further include a tail cover structure 3, which is detachably disposed at the other end of the pen body structure 1.

[0031] Among them, cooperation Figures 4 to 6 As shown, one end of the support unit 20 extends outward to form a joint portion 200. The main body 201 of the support unit 20 is used to connect to the pen body structure 1 of the stylus device D. For example, the support unit 20 may be a rod-shaped structure, comprising a main body 201 and a joint portion 200, with the joint portion 200 located at one end of the main body 201. The main body 201 of the support unit 20 is used to connect to one end of the pen body structure 1 of the stylus device D. One end of the joint portion 200 may be conical, and the other end of the joint portion 200 is connected to the main body 201, and the joint portion 200 and the main body 201 form an integrated structure. The minimum diameter d1 of the joint portion 200 is equal to or less than the minimum diameter d2 of the main body 201, but is not limited thereto.

[0032] Next, cooperate Figures 4 to 6As shown, one end of the core unit 21 has a contact portion 210, and the other end of the core unit 21 is recessed toward one end of the core unit 21 to form a receiving portion 211. The core unit 21 receives the joint portion 200 through the receiving portion 211 so as to be sleeved on the joint portion 200; wherein the core unit 21 can be an elastic structure, therefore, when the core unit 21 and the support unit 20 are not joined, the space size of the receiving portion 211 can be smaller than the volume size of the joint portion 200, or, the space size of the receiving portion 211 can be equal to the volume size of the joint portion 200, but is not limited thereto.

[0033] The contact portion 210 has an arc surface 2100 facing away from the core unit 21, and the radius r of the arc surface 2100 may be between 0.65 mm and 1.25 mm. For example, the core unit 21 may be sleeved on the joint portion 200 of the support unit 20 and cover the joint portion 200, that is, the joint portion 200 is accommodated in the accommodation portion 211. One end of the core unit 21 may be mushroom-shaped, or the contact portion 210 may be semi-spherical. Moreover, the shape of the accommodation portion 211 may be consistent with the outer shape of the joint portion 200, but is not limited thereto. Among them, the radius r of the arc surface 2100 may preferably be 0.65 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm or 1.25 mm, but is not limited thereto.

[0034] Next, cooperate Figures 3 to 8 As shown, the shielding unit 22 can have a hollow conical structure. The shielding unit 22 covers the core unit 21 and the joint portion 200, leaving the contact portion 210 exposed. The shielding unit 22 has a top surface 220 and a bottom surface 221 disposed opposite each other. The top surface 220 and the contact portion 210 are in direct contact with each other. A portion of the bottom surface 221 is recessed toward the top surface 220 to form a recessed portion 222. The center of the recessed portion 222 overlaps with the central axis a of the shielding unit 22. For example, the shielding unit 22 can be mounted on the main body of the core unit 21, leaving the contact portion 210 exposed. The shielding unit 22 can have a hollow conical structure, and its cross-section can be trapezoidal. When the shielding unit 22 is mounted on the core unit 21, the top surface 220 of the shielding unit 22 is in close contact with the other side of the contact portion 210, while one side of the contact portion 210 is a circular arc surface 2100. A portion of the body 201 of the support unit 20 is located in the recess 222. The body 201 of the support unit 20 does not contact the shell unit 22, and the outer edge of the shell unit 22 is in contact with the outer edge of the contact portion 210, but the present invention is not limited thereto.

[0035] Therefore, with Figures 1 to 9As shown, when a user uses the stylus device D to operate the electronic device E, the contact portion 210 is designed with a special size. Therefore, the arc surface 2100 of the contact portion 210 can generate appropriate friction with the surface of the touch screen E1. That is, the arc surface 2100 can obtain appropriate resistance and sliding force, thereby providing the user with a good operating feel. Moreover, the arc surface 2100 of the contact portion 210 will not damage the surface of the touch screen E1. Moreover, because the refill structure 2 of the present invention adopts a multi-piece composite structure and the contact portion 210 of the core unit 21 is a solid structure, the contact portion 210 is not easily deformed or damaged, and the structural strength is greatly improved, thereby improving the service life and durability of the refill structure 2.

[0036] Thus, the stylus device D of the present invention, through the above-described technical solution, can achieve appropriate resistance and sliding force on the arcuate surface 2100 of the contact portion 210, thereby providing the user with a good operating feel. Furthermore, the arcuate surface 2100 of the contact portion 210 does not damage the surface of the touch screen E1. Furthermore, the contact portion 210 is less susceptible to deformation and damage, and the structural strength of the refill structure 2 is significantly enhanced.

[0037] Further, cooperate Figure 4 、 Figure 5 、 Figures 10 to 12 As shown, there may be a predetermined distance h between the center of the arc surface 2100 and the center of the bottom surface 221, and the predetermined distance h may be between 4 mm and 7 mm; wherein, the predetermined distance h may preferably be 6 mm or 6.35 mm. In addition, there may be a predetermined angle b (i.e., the taper of the shell unit 22) between the opposite sides of the shell unit 22, and the predetermined angle b may be between 17 degrees and 29 degrees; wherein, the predetermined angle b may preferably be between 17 degrees and 26 degrees, and most preferably be 27 degrees. Furthermore, in the case where the predetermined distance h of the refill structure 2 of the present invention remains unchanged, the size of the radius r of the arc surface 2100 of the core unit 21 may change and be adjusted as the predetermined angle b changes, or the angle of the predetermined angle b may change and be adjusted as the radius r of the arc surface 2100 changes; for example, in conjunction with Figures 10 to 12 As shown, the radius r of the arc surface 2100 of the three refill structures 2 is 0.65 mm, 0.9 mm and 1.25 mm respectively, and the predetermined distance h of the three refill structures 2 is the same. Figure 10 The predetermined angle b of the refill structure 2 is greater than Figure 11 The predetermined angle b of the refill structure 2 is Figure 11 The predetermined angle b of the refill structure 2 is greater than Figure 12In contrast, in the case of the refill structure 2 of the present invention, when the predetermined angle b remains unchanged, the radius r of the arc surface 2100 can be changed or adjusted according to the change of the predetermined distance h, or the length of the predetermined distance h can be changed or adjusted according to the change of the radius r of the arc surface 2100.

[0038] In addition, based on the above, the present invention further provides a refill structure 2, which includes a support unit 20, a core unit 21, and a protective shell unit 22. One end of the support unit 20 extends outward to form a joint 200, and the main body 201 of the support unit 20 is used to connect with the pen body structure 1 of the stylus device D. One end of the core unit 21 has a contact portion 210, and the other end of the core unit 21 is recessed toward one end of the core unit 21 to form a receiving portion 211. The core unit 21 receives the joint 200 through the receiving portion 211, so as to be sleeved on the joint 200; wherein the contact portion 210 has an arc surface 2100 facing away from the core unit 21, and the radius of the arc surface 2100 is between 0.65 mm and 1.25 mm. The shell unit 22 is a hollow conical structure. The shell unit 22 covers the core unit 21 and the joint 200, and exposes the contact portion 210. The shell unit 22 has a top surface 220 and a bottom surface 221 that are arranged opposite to each other. The top surface 220 and the contact portion 210 are in contact with each other. A portion of the bottom surface 221 is recessed toward the top surface 220 to form a recessed portion 222. The center of the recessed portion 222 overlaps with the central axis a of the shell unit 22.

[0039] However, the above example is only one feasible embodiment and is not intended to limit the present invention.

[0040] Second embodiment

[0041] See also Figures 13 to 15 , which are respectively an exploded schematic diagram of the stylus device according to the second embodiment of the present invention, a structural schematic diagram of the pen core structure, and a cross-sectional schematic diagram of the pen core structure. Please refer to Figures 1 to 12 As shown in the figure, the stylus pen structure D of this embodiment is substantially similar to the stylus pen structure D of the first embodiment, so the arrangement or operation of the same components will not be repeated here. In this embodiment, the pen body structure 1 of the present invention may further include an upper shell unit 10, a lower shell unit 11, an outer shell unit 12 and a control unit 13. Figures 1 to 3 and Figure 13As shown, the upper shell unit 10 and the lower shell unit 11 are detachably connected to each other, defining a storage space S between the upper shell unit 10 and the lower shell unit 11. The outer shell unit 12 is detachably mounted on the exterior of the upper shell unit 10 and the lower shell unit 11 to cover the upper shell unit 10 and the lower shell unit 11. Furthermore, the refill structure 2 is disposed at one end of the structure formed by the upper shell unit 10, the lower shell unit 11, and the outer shell unit 12, and the tail cover structure 3 is detachably disposed at the other end of the structure formed by the upper shell unit 10, the lower shell unit 11, and the outer shell unit 12. The control unit 13 can be disposed in the storage space S.

[0042] Furthermore, the contact portion 210 of the refill structure 2 of the present invention may also include a first portion 2101 and a second portion 2102. For example, Figure 13 and Figure 14 As shown, the first part 2101 is connected to the second part 2102. The first part 2101 can be semi-spherical, and the second part 2102 can be flat and conical. One side of the first part 2101 is an arc surface 2100, and the other side of the first part 2101 is connected to one side of the second part 2102. The other side of the second part 2102 is in direct contact with the top surface 220 of the shell unit 22. Figure 6 As shown, the radius r of the arc surface 2100 may be between 0.65 mm and 1.25 mm. The radius r of the arc surface 2100 may preferably be 0.65 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm or 1.25 mm, but is not limited thereto.

[0043] However, the above example is only one feasible embodiment and is not intended to limit the present invention.

[0044] Furthermore, in the present invention, the materials of the support unit 20, core unit 21, and shell unit 22 can be different. The materials of the support unit 20, core unit 21, and shell unit 22 can be selected and determined by the manufacturer based on actual needs. Furthermore, the support unit 20 and shell unit 22 can be made of a hard material, while the core unit 21 can be made of a solid, soft material.

[0045] Advantageous Effects of the Embodiments

[0046] One of the beneficial effects of the present invention is that the stylus device D and the refill structure 2 provided by the present invention can be formed by "one end of the support unit 20 extending outward to form a joint portion 200, and the body 201 of the support unit 20 is used to connect with the pen body structure 1 of the stylus device D. One end of the core unit 21 has a contact portion 210, and the other end of the core unit 21 is recessed toward one end of the core unit 21 to form a receiving portion 211. The core unit 21 receives the joint portion 200 through the receiving portion 211, so as to be sleeved on the joint portion 200; wherein the contact portion 210 has an arc surface 2100 facing away from the core unit 21, and the arc surface The radius of 2100 ranges from 0.65mm to 1.25mm. The protective shell unit 22 has a hollow conical structure. The protective shell unit 22 covers the core unit 21 and the joint 200, leaving the contact portion 210 exposed. The protective shell unit 22 has a top surface 220 and a bottom surface 221 arranged opposite each other. The top surface 220 and the contact portion 210 are in contact with each other. A portion of the bottom surface 221 is recessed toward the top surface 220 to form a recessed portion 222. The center of the recessed portion 222 overlaps with the central axis a of the protective shell unit 22. This "technical solution" improves service life, provides users with a good operating feel, and prevents damage to the touch screen.

[0047] Furthermore, the stylus device D and refill structure 2 provided by the present invention utilize a specially sized contact portion 210, which allows the arcuate surface 2100 of the contact portion 210 to generate moderate friction with the surface of the touch screen E1, thereby providing the user with a pleasant operating feel. Furthermore, the arcuate surface 2100 of the contact portion 210 does not damage the surface of the touch screen E1. Furthermore, because the refill structure 2 utilizes multiple tightly integrated components and the contact portion 210 of the core unit 21 is a solid structure, the contact portion 210 of the refill structure 2 is less susceptible to deformation and damage over long-term use. Furthermore, the structural strength of the refill structure 2 is significantly enhanced, thereby increasing the service life and durability of the refill structure 2.

[0048] The contents disclosed above are only preferred feasible embodiments of the present invention and therefore do not limit the scope of protection of the claims of the present invention. Therefore, all equivalent technical changes made using the contents of the description and drawings of the present invention are included in the scope of protection of the claims of the present invention.

Claims

1. A stylus device, characterized in that: include: Pen body structure; as well as The refill structure comprises: A support unit, one end of which extends outward to form a joint portion, and a body of the support unit is used to connect with one end of the pen body structure; A core unit, wherein one end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65 mm and 1.25 mm; and The shell unit is a hollow conical structure, the shell unit covers the core unit and the joint portion, and exposes the contact portion, the shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the shell unit. There is a predetermined distance between the center of the arc surface and the center of the bottom surface, and a predetermined angle is formed between the two opposite sides of the shell unit. When the predetermined distance is fixed, the angle of the predetermined angle changes or adjusts as the radius changes.

2. A stylus device, characterized in that: include: Pen body structure; as well as The refill structure comprises: A support unit, one end of which extends outward to form a joint portion, and a body of the support unit is used to connect with one end of the pen body structure; A core unit, wherein one end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65 mm and 1.25 mm; and The shell unit is a hollow conical structure, the shell unit covers the core unit and the joint portion, and exposes the contact portion, the shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the shell unit. There is a predetermined distance between the center of the arc surface and the center of the bottom surface, and there is a predetermined angle between the opposite sides of the shell unit. When the predetermined angle is fixed, the length of the predetermined distance changes or is adjusted according to the change of the radius.

3. The stylus device according to claim 1 or 2, wherein: The predetermined distance is between 4 mm and 7 mm.

4. The stylus device according to claim 1 or 2, wherein: The predetermined angle is between 17 degrees and 29 degrees.

5. The stylus device according to claim 1 or 2, wherein: The supporting unit, the core unit and the shell unit are made of different materials.

6. The stylus device according to claim 1 or 2, wherein: The support unit and the shell unit are made of hard material, and the core unit is made of soft material.

7. A pen core structure, characterized in that: include: a support unit, one end of which extends outward to form a joint portion, and a body of the support unit is used to connect with the pen body structure of the stylus device; A core unit, wherein one end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65 mm and 1.25 mm; and The shell unit is a hollow conical structure, the shell unit covers the core unit and the joint portion, and exposes the contact portion, the shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the shell unit. There is a predetermined distance between the center of the arc surface and the center of the bottom surface, and a predetermined angle is formed between the two opposite sides of the shell unit. When the predetermined distance is fixed, the angle of the predetermined angle changes or adjusts as the radius changes.

8. A pen core structure, characterized in that: include: a support unit, one end of which extends outward to form a joint portion, and a body of the support unit is used to connect with the pen body structure of the stylus device; A core unit, wherein one end of the core unit has a contact portion, and the other end of the core unit is recessed toward the one end of the core unit to form an accommodating portion, and the core unit accommodates the joint portion through the accommodating portion to be sleeved on the joint portion; wherein the contact portion has an arc surface facing away from the core unit, and the radius of the arc surface is between 0.65 mm and 1.25 mm; and The shell unit is a hollow conical structure, the shell unit covers the core unit and the joint portion, and exposes the contact portion, the shell unit has a top surface and a bottom surface arranged opposite to each other, the top surface and the contact portion are in contact with each other, a portion of the bottom surface is recessed toward the top surface to form a recessed portion, and the center of the recessed portion overlaps with the central axis of the shell unit. There is a predetermined distance between the center of the arc surface and the center of the bottom surface, and there is a predetermined angle between the opposite sides of the shell unit. When the predetermined angle is fixed, the length of the predetermined distance changes or is adjusted according to the change of the radius.

9. The pen core structure according to claim 7 or 8, characterized in that: The predetermined distance is between 4 mm and 7 mm.

10. The pen core structure according to claim 7 or 8, characterized in that: The predetermined angle is between 17 degrees and 29 degrees.

11. The pen core structure according to claim 7 or 8, characterized in that: The supporting unit, the core unit and the shell unit are made of different materials.

12. The pen core structure according to claim 7 or 8, characterized in that: The support unit and the shell unit are made of hard material, and the core unit is made of soft material.

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