A pressure sensing module for an electronic pen and an electronic pen
By combining the module bracket, force transmission shaft, deformation component and strain gauge, the detection path of normal force is simplified, solving the problems of complex structure and high cost of existing electronic pens, and realizing more efficient normal force detection and lower production cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN XINWEI INTELLIGENT TECH CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-06-02
AI Technical Summary
Existing electronic pens are complex and costly to detect normal forces, resulting in low assembly and manufacturing efficiency.
The system employs a combination structure of modular support, force transmission shaft, deformation component, and strain gauge. It uses the lever principle to transmit the normal force to the deformation component for detection, thus simplifying the transmission path of the normal force.
It improves the integrity and accuracy of normal force detection, reduces production costs, and simplifies the manufacturing process.
Smart Images
Figure CN224318006U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic pen technology, and more particularly to a pressure-sensitive module for an electronic pen and an electronic pen. Background Technology
[0002] Electronic pens are widely used in various terminal devices with touch screens, such as tablet computers and touch screen mobile phones.
[0003] When using an electronic pen, users typically hold it at an angle. Therefore, the force exerted by the touchscreen on the pen, besides acting along the pen's axis, also includes a force perpendicular to the axis; this force is called the normal force. The completeness and accuracy of the normal force detection in the electronic pen affects its pressure sensitivity.
[0004] Currently, some electronic pens use more components and complex structural designs to collect and obtain normal force in order to improve the pressure sensitivity of the electronic pen. However, such designs make the assembly and manufacturing of electronic pens more inefficient and increase costs. Utility Model Content
[0005] To address the aforementioned problems, embodiments of this application provide a pressure-sensitive module for an electronic pen, comprising:
[0006] Module support, wherein the module support is provided with a hollow cavity;
[0007] A force transmission shaft is inserted into the hollow cavity. A preset gap is provided between the outer wall of the force transmission shaft and the inner wall of the hollow cavity, and one end of the force transmission shaft is used to connect with the tip of the electronic pen.
[0008] A deformable component, which is fixedly connected between the force transmission shaft and the module support;
[0009] A strain gauge is connected to the deformable element to detect the degree of deformation of the deformable element.
[0010] Optionally, along the axial direction of the force transmission shaft, the force transmission shaft includes a first shaft segment and a second shaft segment, wherein the diameter of the first shaft segment is smaller than the diameter of the second shaft segment;
[0011] The hollow cavity includes a first through hole and a second through hole that are interconnected; the diameter of the first through hole is smaller than the diameter of the second through hole;
[0012] The first shaft segment passes through the first through hole, and the second shaft segment passes through the second through hole.
[0013] Optionally, the module support includes a first support and a second support;
[0014] The first bracket is provided with the first through hole, and the second bracket is provided with the second through hole. The first bracket and the second bracket are coaxially arranged and connected.
[0015] The deformable component includes at least two independent spring pieces, which are circumferentially spaced around the force transmission shaft. One end of each spring piece is connected to the force transmission shaft, and the other end is connected to the module support.
[0016] Optionally, the spring includes a first connecting portion, a mounting portion, and a second connecting portion;
[0017] The first connecting part and the second connecting part are each fixed to one end of the mounting part. The first connecting part is bent relative to the mounting part to form a first included angle, and the second connecting part is bent relative to the mounting part to form a second included angle. The strain gauge is fixed to the mounting part.
[0018] The first connecting part is connected to the side wall of the force transmission shaft, and the second connecting part is connected to the side wall of the module bracket.
[0019] Optionally, the pressure-sensitive module further includes a reset component;
[0020] The reset member is disposed in the hollow cavity and is used to provide a force to the force transmission shaft. The force tends to make the axis of the force transmission shaft coincide with the axis of the hollow cavity.
[0021] Optionally, the reset element is a conical helical spring, and the pressure-sensitive module further includes a mounting base;
[0022] The first end of the conical helical spring abuts against the end of the force transmission shaft away from the pen tip, and the second end of the conical helical spring abuts against the mounting base. The mounting base is connected to the module bracket. The first end is the end with a smaller outer diameter of the conical helical spring, and the second end is the end with a larger outer diameter of the conical helical spring.
[0023] Optionally, a positioning structure is provided at the end of the force transmission shaft away from the pen tip, and the first end of the conical helical spring is fixedly connected to the positioning structure.
[0024] Optionally, the mounting base and the module bracket are fixedly connected by a threaded structure.
[0025] Optionally, the pressure-sensitive module further includes an adjusting nut;
[0026] The adjusting nut is connected to the force transmission shaft via a threaded structure to adjust the length of one end of the force transmission shaft extending out of the hollow cavity.
[0027] This application also provides an electronic pen, which includes any of the aforementioned pressure-sensitive modules.
[0028] In this embodiment, when the pressure-sensitive module is used in an electronic pen, the transmission path of the normal force acting on the pen tip is "pen tip—force transmission shaft—deformation element—strain gauge". This transmission path is simpler, and the normal force is less likely to be decomposed and dissipated by other components. This simpler design reduces the loss of normal force components, improving the completeness and accuracy of normal force detection, and thus enhancing the performance of the electronic pen. Furthermore, the pressure-sensitive module in this embodiment has a simple structure, making it easier to manufacture and assemble, which not only improves production efficiency but also reduces costs.
[0029] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0031] Figure 1 This is an isometric schematic diagram of a pressure-sensitive module in one embodiment of this application;
[0032] Figure 2 This is an embodiment of the present application. Figure 1 Side view;
[0033] Figure 3 This is an embodiment of the present application. Figure 2 A cross-sectional view along the AA direction;
[0034] Figure 4 This is an embodiment of the present application. Figure 3 Cross-sectional view of the central force transmission shaft when it is tilted;
[0035] Figure 5 This is an isometric schematic diagram of the force transmission shaft in one embodiment of this application;
[0036] Figure 6 This is an embodiment of the present application. Figure 5 Side view;
[0037] Figure 7 This is an isometric schematic diagram of the module bracket in one embodiment of this application;
[0038] Figure 8 This is an embodiment of the present application. Figure 7 Side view;
[0039] Figure 9 This is an embodiment of the present application. Figure 8A cross-sectional view along the BB direction;
[0040] Figure 10 This is an isometric schematic diagram of the spring sheet in one embodiment of this application.
[0041] Explanation of reference numerals in the attached figures:
[0042] 10. Module bracket; 11. Force transmission shaft; 12. Deformation component; 13. Reset component; 14. Mounting base; 15. Adjusting nut; 10a. First bracket; 10b. Second bracket; 101. Hollow cavity; 101a. First through hole; 101b. Second through hole; 111. First shaft section; 112. Second shaft section; 113. Positioning structure; 121. Spring piece; 1211. First connecting part; 1212. Mounting part; 1213. Second connecting part. Detailed Implementation
[0043] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0044] Smart writing tools such as electronic pens or smart pens are typically used with electronic devices that have touchscreens to perform selection, writing, or drawing functions on the touchscreen. When a user holds an electronic pen, the pen body is usually tilted relative to the touchscreen. Therefore, when the electronic pen is in this tilted position, its tip is subjected to a force not only along the axis of the pen body but also a force perpendicular to the axis of the pen body (called the normal force or radial force).
[0045] The pressure-sensitive modules of the various embodiments described below utilize the "lever principle" to transmit the deformation of the pen tip to a deformation element within the pressure-sensitive module. This allows strain gauges on the deformation element to detect the normal force when the electronic pen is tilted. The pressure-sensitive modules of these embodiments reduce the loss of normal force components, improving the completeness and accuracy of normal force detection, thus enhancing the performance of the electronic pen. Furthermore, their simple structure facilitates manufacturing and assembly, improving production efficiency and reducing costs.
[0046] Example 1
[0047] like Figure 1 The image shown is an isometric schematic diagram of a pressure-sensitive module for an electronic pen according to an embodiment of this application. Figure 2 for Figure 1 Side view. In Figure 1 and Figure 2 The pressure-sensitive module includes a module bracket 10, a force-transmitting shaft 11, and a deformation component 12. The module bracket 10 can be an injection-molded part or a metal part, and it is cylindrical with a hollow cavity 101. The hollow portion within the hollow cavity 101 can accommodate a portion of the force-transmitting shaft 11 and the deformation component 12. In some embodiments, the module bracket 10 can also be an irregular frame structure with hollow spaces. The hollow spaces can include the aforementioned hollow cavity 101 and gaps provided on the sidewalls of the module bracket 10. When the pressure-sensitive module of this embodiment is installed in an electronic pen, the module bracket 10 can be a component independent of the pen body shell, embedded inside the pen body shell, allowing the user to directly hold and touch the pen body shell when using the electronic pen. Alternatively, the module bracket 10 can be used directly as the pen body shell, eliminating the need for a separate pen body shell. That is, the module bracket 10 is used to install the force-transmitting shaft 11, the deformation component 12, etc., and is also exposed externally for the user to hold and contact.
[0048] The material of the force transmission shaft 11 is similar to that of the module bracket 1. The force transmission shaft 11 can also be an injection-molded part or a metal part. The force transmission shaft 11 passes through the hollow cavity 101. A preset gap is provided between the outer wall of the force transmission shaft 11 and the inner wall of the hollow cavity 101. One end of the force transmission shaft 11 is used to connect with the tip of the electronic pen. In one structure, the force transmission shaft 11 is relatively long, with one end extending out of the hollow cavity 101 and fixedly connected to the pen tip. In another structure, the force transmission shaft 11 is relatively short, with the part of the pen tip used for fixed connection to the force transmission shaft 11 extending into the hollow cavity 101. This preset gap is not only designed to allow the force transmission shaft 11 to pass normally through the hollow cavity 101, but also to allow the force transmission shaft 11 to deflect and swing relative to the module bracket 10, forming a lever-like tilting swing. For example, this preset gap can be slightly larger than the conventional assembly gap, ranging from 0.15mm to 0.5mm.
[0049] in addition, Figure 3 for Figure 1 A cross-sectional diagram along the AA direction, combined with... Figure 2 and Figure 3As illustrated, a deformable element 12 is provided in the gap between the force transmission shaft 11 and the module support 10. The deformable element 12 is connected to both the force transmission shaft 11 and the module support 10, suspending and supporting the force transmission shaft 11 within the hollow cavity 101 inside the module support 10. In this embodiment, the deformable element 12 can be multiple separate connecting pieces, or it can be a closed annular component surrounding the force transmission shaft 11. It can also be separated by multiple perforated gaps to form a connection for fixing to the module support 10 or the force transmission shaft 11. It is understood that regardless of the shape or structure of the deformable element 12, it possesses elastic deformation properties. When the force transmission shaft 11 moves relative to the module support 10, it can cause the deformable element 12 to deform. After the external force acting on the force transmission shaft 11 is removed, the deformable element 12 can return to its initial installed shape.
[0050] Additionally, a strain gauge (not shown in the figure) is connected to the deformable member 12. For example, the strain gauge can be glued to the deformable member 12. It is understood that the strain gauge in this embodiment can be a force sensor such as a strain gauge plate, which can detect the degree of deformation of the deformable member 12 when it deforms.
[0051] Figure 4 A simplified diagram of the force transmission shaft 11 tilting and deflecting is also shown. Figure 4 The direction indicated by the arrow F is the direction of the normal force, and the position of the deformable component 12 can be regarded as the fulcrum position when the force transmission shaft 11 deflects. Combined with... Figure 4 As illustrated, it is easy to understand that when a user holds the electronic pen at an angle, the normal force exerted by the touch screen on the pen tip causes the force transmission shaft 11 in the pressure-sensitive module to deflect and swing relative to the module support 10. When the force transmission shaft 11 deflects and swings, it also causes the deformation of the deformation component 12. Correspondingly, the deformation amplitude of the deformation component 12 can be detected by the strain gauge.
[0052] Combination Figure 3 and Figure 4The illustration also needs to clarify that when a user uses the electronic pen, the force on the pen tip may fall into three different categories: 1) The pen tip is subjected to an axial force along the axis of the force transmission shaft 11, which can cause the pen tip and the force transmission shaft 11 to tend to retract relative to the module support 1 along the axial direction; 2) The pen tip is subjected to a normal force perpendicular to the axis of the force transmission shaft 11, which can cause the pen tip and the force transmission shaft 11 to tend to rotate relative to the module support 1; 3) The pen tip is subjected to an inclined force that intersects the axis of the force transmission shaft 11 at an angle, which can be decomposed into the axial force in category 1) and the normal force in category 2). The inclined force can cause the pen tip and the force transmission shaft 11 to rotate and retract relative to the module support 1, and the motion of the pen tip and the force transmission shaft 11 is a composite motion. In the above three different usage scenarios of the electronic pen, at least one of the axial force and the normal force acting on the pen tip by the touch screen can be detected by the pressure-sensitive module of this application embodiment.
[0053] Therefore, when the pressure-sensitive module of this application is used in an electronic pen, the transmission path of the normal force acting on the pen tip is "pen tip—force transmission shaft 11—deformation element 12—strain gauge". This normal force transmission path is simpler, and the normal force is less likely to be decomposed and dissipated by other components. Adopting this simpler design structure reduces the loss of normal force components, improves the completeness and accuracy of normal force detection, and helps improve the performance of the electronic pen. Furthermore, the pressure-sensitive module of this application has a simple structure, is easier to manufacture and assemble, and not only improves product production efficiency but also reduces costs.
[0054] Example 2
[0055] In one embodiment, the force transmission shaft 11 in the aforementioned embodiment one of this application can be as follows: Figure 5 and Figure 6 As shown, this is a stepped shaft structure. Specifically, along the axial direction L of the force transmission shaft 11, the force transmission shaft 11 includes two parts: a first shaft segment 111 and a second shaft segment 112. The diameter of the first shaft segment 111 is smaller than the diameter of the second shaft segment 112. When the pressure-sensitive module is installed inside the electronic pen, the first shaft segment 111 is closer to the tip of the electronic pen, and the second shaft segment 112 is closer to the tail of the electronic pen.
[0056] Accordingly, combined Figures 7 to 9 The schematic module support 10 has a hollow cavity 101 including a first through hole 101a and a second through hole 101b that are interconnected. The diameter of the first through hole 101a is smaller than the diameter of the second through hole 101b.
[0057] When the force transmission shaft 11 is assembled with the module bracket 10, the first shaft segment 111 passes through the first through hole 101a, and the end of the first shaft segment 111 extends out of the first through hole 101a and can be connected to the tip of the electronic pen.
[0058] The second shaft segment 112 can be entirely located within the second through hole 101b.
[0059] Thus, the smaller diameter first through hole 101a can form an axial obstruction to the larger diameter second shaft segment 112, preventing the force transmission shaft 11 from sliding out and falling out of the hollow cavity 101.
[0060] Furthermore, in one embodiment, based on the above-described embodiment two, the module bracket 10 of this application embodiment can be a split structure, specifically including a first bracket 10a and a second bracket 10b. The first bracket 10a and the second bracket 10b can be injection molded using independent molds. A first through hole 101a is injection molded on the first bracket 10a, and a second through hole 101b is injection molded on the second bracket 10b. After the two brackets are coaxially arranged, their opposite ends can be nested and fixedly connected by adhesive.
[0061] Compared to a single piece, this modular bracket 10 with a split structure can reduce the mold development cost of the modular bracket 10 and reduce the manufacturing complexity of the modular bracket 10.
[0062] Example 3
[0063] In one embodiment, the deformable component 12 of the aforementioned embodiment 1 of this application can be as follows: Figure 2 and Figure 3 The shrapnel 121 shown is combined with... Figure 2 and Figure 3 As shown in the diagram, at least two spring pieces 121 are circumferentially spaced around the force transmission shaft 11. One end of each spring piece 121 is connected to the force transmission shaft 11, and the other end is connected to the module support 10. Each spring piece 121 is also fixed with a strain gauge (not shown in the figure). For example, when both ends of the spring piece 121 are respectively connected to the force transmission shaft 11 and the module support 10, a connection structure such as a protrusion or groove can be provided, or the corresponding parts can be connected together by adhesive bonding to ensure that the ends of the spring pieces 121 are fixed to the force transmission shaft 11 and the module support 10.
[0064] This split design and spaced-apart spring 121 can avoid interference from the normal force acting on the pen tip along different radial parts, that is, the normal force corresponding to the part of the spring 121 can be accurately detected.
[0065] Furthermore, in one embodiment, based on the above-described embodiment three, the spring 121 of the aforementioned embodiment one of this application can be as follows: Figure 10 As shown, the spring 121 can be made of metal sheet by stamping, or by injection molding of plastic with good elasticity and not easily broken. Combined with... Figure 4As illustrated, the spring 121 includes a first connecting portion 1211, a mounting portion 1212, and a second connecting portion 1213. The first connecting portion 1211 is connected to one end of the mounting portion 1212, and the second connecting portion 1213 is connected to the other end of the mounting portion 1212. The first connecting portion 1211 is bent relative to the mounting portion 1212 to form a first included angle, and the second connecting portion 1213 is bent relative to the mounting portion 1212 to form a second included angle.
[0066] It is understood that when the force transmission shaft 11 is not subjected to a normal force, the spring piece 121 maintains its initial shape, and both the first and second included angles retain their initial angles. The initial angles of the first and second included angles are designed accordingly based on the shape and structure of the hollow cavity 101 and the force transmission shaft 11; however, this embodiment does not limit this design. For example, Figure 10 The first and second included angles are both 90°.
[0067] The first connecting portion 1211 of the spring piece 121 is fixed to the side wall of the force transmission shaft 11, and the second connecting portion 1213 of the spring piece 121 is fixed to the side wall of the hollow cavity 101. Specifically, taking the aforementioned embodiment two as an example, the first connecting portion 1211 can be bonded and fixed to the outer wall of the first shaft segment 111, and the second connecting portion 1211 can pass through the through hole in the side wall of the first bracket 10a and be bonded and fixed to the outer wall of the second bracket 10b. The strain gauge can be bonded and fixed to the mounting portion 1212.
[0068] When the force transmission shaft 11 is subjected to a normal force, the force transmission shaft 11 causes the spring 121 to deform, which will at least cause a change in the first included angle. At the same time, the deformation of the spring 121 will cause the strain gauge on the mounting part 1212 to operate and output a corresponding electrical signal to reflect the magnitude of the normal force.
[0069] The Z-shaped spring 121 of this application embodiment has a relatively simple shape and structure, is easy to assemble, simplifies the action path of the normal force, improves the integrity of the normal force detection, and simplifies the assembly process.
[0070] In addition, it should be noted that in order to ensure that the first connecting part 1211 and the side wall of the force transmission shaft 11, and the second connecting part 1213 and the side wall of the hollow cavity 101 can fit tightly, when the side wall of the force transmission shaft 11 and the module bracket 10 is curved, the first connecting part 1211 and the second connecting part 1213 are also correspondingly curved, and the curvature is consistent with the curvature of the connected parts.
[0071] Furthermore, in one embodiment, based on the above-described embodiment three, the number of spring pieces 121 in this application embodiment can be an even number, evenly arranged around the force transmission shaft 11 in the circumferential direction. When the user uses the electronic pen, if the electronic pen is rotated around its own axis by a certain angle, the normal force in different directions can be detected by using the spring pieces 121 at different circumferential locations and strain gauges, thereby improving the detection differences between different usage methods.
[0072] Example 4
[0073] In one embodiment, when the normal force acting on the force transmission shaft 11 disappears, in order to enable the force transmission shaft 11 to automatically return to the center of the hollow cavity 101, the axis of the force transmission shaft 11 is kept to coincide with the axis of the hollow cavity 101 again.
[0074] like Figure 3 and Figure 4 As shown, the pressure-sensitive module of the aforementioned embodiment of this application may further include a reset member 13, which is disposed in the hollow cavity 101 and is used to provide force to the force transmission shaft 11.
[0075] It should be noted that the reset member 13 in this embodiment can be a simple structure with a spring or an elastic rubber pad, or it can be a more complex motion mechanism, as long as it can generate a force acting on the force transmission shaft 11. It is understood that this force includes at least a radial component along the force transmission shaft 11, which is opposite to the normal force mentioned in the previous embodiment. Therefore, the force of the reset member 13 tends to make the axis of the force transmission shaft 11 coincide with the axis of the hollow cavity 101. Therefore, when the normal force disappears, the force of the reset member 13 can push the force transmission shaft 11 to automatically return to center and reset. It should also be noted that in this embodiment, when the force transmission shaft 11 is tilted, after the deformation member 12 undergoes elastic deformation, the deformation member 12 will also generate a force that promotes the centering and reset of the force transmission shaft 11. Under the combined action of the reset member 13 and the deformation member 12, the process of centering and resetting the force transmission shaft 11 can be made more reliable and rapid, preventing the failure of either component from causing the force transmission shaft 11 to fail to reset.
[0076] Furthermore, in one embodiment, based on the above-described embodiment four, such as Figure 3 As shown, the reset member 13 in this embodiment can be a conical helical spring. In this case, the pressure-sensitive module also includes a mounting base 14.
[0077] like Figure 3As shown, for a conical helical spring, the end with the smaller outer diameter is the first end, and the end with the larger outer diameter is the second end. The first end of the conical helical spring abuts or connects to the end of the force transmission shaft 11 away from the pen tip, and the second end of the conical helical spring abuts or connects to the mounting base 14. The mounting base 14 is fixedly connected to the module bracket 10.
[0078] A conical helical spring is used as the reset element 13, with its smaller outer diameter end abutting against the force transmission shaft 11. When the force transmission shaft 11 deflects and swings, the first end of the conical helical spring deflects relative to the second end, thereby generating a radial force opposite to the normal force. This conical helical spring as the reset element 13 is simple and easy to assemble. In addition, the conical helical spring can also generate an axial force acting on the force transmission shaft 11, forming the axial damping feel of the electronic pen.
[0079] Furthermore, in one embodiment, based on the conical helical spring serving as the reset element 13 in the above embodiments, such as... Figure 5 As shown, a positioning structure 113 is provided at the end of the force transmission shaft 11 away from the pen tip. The first end of the conical helical spring is fixedly connected to the positioning structure 113, which can prevent the first end of the conical helical spring from slipping on the end face of the force transmission shaft 11. Exemplarily, the positioning structure 113 can be a positioning post protruding from the end face of the force transmission shaft 11 or a concave annular groove. The first end of the conical helical spring can be sleeved on the outside of the positioning post or embedded in the inside of the annular groove.
[0080] In another embodiment, based on the conical helical spring serving as the reset element 13 in the above embodiments, the mounting base 14 is fixedly connected to the module bracket 10 via a threaded structure. Using this fixing method, the conical helical spring can be tightened or loosened by rotating the mounting base 14, adjusting the deformation degree of the spring piece 121 during the initial installation of the pressure-sensitive module. Alternatively, during after-sales maintenance, rotating the mounting base 14 can make the spring piece 121 more sensitive to deformation, ensuring the accuracy of normal force detection.
[0081] Example 5
[0082] In one implementation, such as Figure 3 As shown, the pressure-sensitive module of the aforementioned embodiment of this application may further include an adjusting nut 15. The adjusting nut 15 is connected to the force transmission shaft 11 via a threaded structure to adjust the length of one end of the force transmission shaft 11 extending out of the hollow cavity 101.
[0083] Specifically, taking the aforementioned Embodiment 2 as an example, combined with Figure 3As illustrated, the adjusting nut 15 can be mounted on the first shaft segment 111. When the pressure-sensitive module of this embodiment is installed inside the electronic pen, the axial position of the adjusting nut 15 is fixed. When the adjusting nut 15 is rotated, the first shaft segment 111 can be extended or retracted. Therefore, by setting the adjusting nut 15, the extension length of the force transmission shaft 11 can be controlled, and the deformation degree of the spring 121 can also be adjusted. Of course, it is understood that the adjusting nut 15 and the mounting base 14 adjust the spring 121 from the head and tail of the pressure-sensitive module, respectively. In a specific design, one can be designed as a coarse adjustment and the other as a fine adjustment to balance efficiency and accuracy.
[0084] Example 6
[0085] This application also provides an electronic pen, which includes the pressure-sensitive module of any of the foregoing embodiments. By applying the above-described pressure-sensitive module to the electronic pen, the product performance of the electronic pen can be improved, and manufacturing efficiency can also be increased and costs reduced.
[0086] Example 7
[0087] This application also provides an electronic device, which includes the aforementioned electronic pen. In addition to the electronic pen, the electronic device also includes a touchscreen terminal (e.g., tablet computer, touchscreen phone, smart screen, etc.) used in conjunction with the electronic pen. Based on the advantages of the pressure-sensitive module and electronic pen described in the foregoing embodiments, the operational efficiency and user experience when the electronic pen interacts with such electronic devices can be improved.
[0088] 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 limit this application.
[0089] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this application, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0090] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.
[0091] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or at least two embodiments or examples.
[0093] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application.
Claims
1. A pressure-sensitive module for an electronic pen, characterized in that, include: Module support (10), wherein the module support (10) is provided with a hollow cavity (101); A force transmission shaft (11) is inserted into the hollow cavity (101). A preset gap is provided between the outer wall of the force transmission shaft (11) and the inner wall of the hollow cavity (101), and one end of the force transmission shaft (11) is used to connect with the tip of the electronic pen. Deformable element (12), the deformable element (12) is connected between the force transmission shaft (11) and the module support (10); A strain gauge is connected to the deformable element (12) to detect the degree of deformation of the deformable element (12).
2. The pressure-sensitive module for an electronic pen according to claim 1, characterized in that, Along the axial direction of the force transmission shaft (11), the force transmission shaft (11) includes a first shaft segment (111) and a second shaft segment (112), wherein the diameter of the first shaft segment (111) is smaller than the diameter of the second shaft segment (112); The hollow cavity (101) includes a first through hole (101a) and a second through hole (101b) that are interconnected; the diameter of the first through hole (101a) is smaller than the diameter of the second through hole (101b); The first shaft segment (111) passes through the first through hole (101a), and the second shaft segment (112) passes through the second through hole (101b).
3. The pressure-sensitive module for an electronic pen according to claim 2, characterized in that, The module support (10) includes a first support (10a) and a second support (10b); The first bracket (10a) is provided with the first through hole (101a), and the second bracket (10b) is provided with the second through hole (101b). The first bracket (10a) and the second bracket (10b) are coaxially arranged and connected.
4. The pressure-sensitive module for an electronic pen according to claim 1, characterized in that, The deformable element (12) includes at least two independent spring pieces (121), which are circumferentially spaced around the force transmission shaft (11). One end of the spring piece (121) is connected to the force transmission shaft (11), and the other end of the spring piece (121) is connected to the module bracket (10).
5. The pressure-sensitive module for an electronic pen according to claim 4, characterized in that, The spring clip (121) includes a first connecting part (1211), a mounting part (1212), and a second connecting part (1213); The first connecting part (1211) and the second connecting part (1213) are each fixed to one end of the mounting part (1212). The first connecting part (1211) is bent relative to the mounting part (1212) to form a first included angle, and the second connecting part (1213) is bent relative to the mounting part (1212) to form a second included angle. The strain gauge is fixed to the mounting part (1212). The first connecting part (1211) is connected to the side wall of the force transmission shaft (11), and the second connecting part (1213) is connected to the side wall of the module bracket (10).
6. The pressure-sensitive module for an electronic pen according to claim 1, characterized in that, The pressure-sensitive module also includes a reset component (13); The reset member (13) is disposed in the hollow cavity (101) and is used to provide a force to the force transmission shaft (11). The force tends to make the axis of the force transmission shaft (11) coincide with the axis of the hollow cavity (101).
7. The pressure-sensitive module for an electronic pen according to claim 6, characterized in that, The reset component (13) is a conical helical spring, and the pressure-sensitive module also includes a mounting base (14); The first end of the conical helical spring abuts against the end of the force transmission shaft (11) away from the pen tip, and the second end of the conical helical spring abuts against the mounting base (14). The mounting base (14) is connected to the module bracket (10). The first end is the end with a smaller outer diameter of the conical helical spring, and the second end is the end with a larger outer diameter of the conical helical spring.
8. The pressure-sensitive module for an electronic pen according to claim 7, characterized in that, The end of the force transmission shaft (11) away from the pen tip is provided with a positioning structure (113), and the first end of the conical helical spring is fixedly connected to the positioning structure (113).
9. The pressure-sensitive module for an electronic pen according to claim 7, characterized in that, The mounting base (14) and the module bracket (10) are fixedly connected by a threaded structure.
10. The pressure-sensitive module for an electronic pen according to claim 1, characterized in that, The pressure-sensitive module also includes an adjusting nut (15); The adjusting nut (15) is connected to the force transmission shaft (11) by a threaded structure to adjust the length of one end of the force transmission shaft (11) extending out of the hollow cavity (101).
11. An electronic pen, characterized in that, The electronic pen includes the pressure-sensitive module as described in any one of claims 1 to 10.