Stylus and strain gauge assembly

Abstract

Disclosed in the present application are a stylus and a strain gauge assembly. The stylus comprises a barrel, a frame, a tip, a main shaft assembly, a sensing support, a control assembly, and a strain gauge. The main shaft assembly is connected to the tip; when the stylus is used for writing on a screen, the main shaft assembly is used for enabling the tip to move in a preset direction relative to the barrel; the control assembly is electrically connected to the strain gauge; the sensing support comprises a deformation beam and at least one cantilever connected to the deformation beam, the deformation beam extending in the preset direction and being connected to the frame, and the at least one cantilever being connected to the main shaft assembly; the strain gauge is arranged on the deformation beam. When the tip moves in the preset direction relative to the barrel, the main shaft assembly drives the at least one cantilever to move, such that the deformation beam and the strain gauge undergo elastic deformation, and then the control assembly detects the elastic deformation of the strain gauge to obtain the writing pressure of the tip with respect to the screen. In this way, the sensing support has a simple structure, such that the overall structure of the stylus is relatively simple.

Description

Touch pen and strain gauge assembly TECHNICAL FIELD

[0001] The present application relates to a touch pen and a strain gauge assembly. BACKGROUND

[0002] With the explosive growth of screen-based electronic devices such as smart phones and tablets, screen-based electronic devices are usually equipped with touch pens for easy operation of the screen.

[0003] In the related art, the touch pen often involves pressure detection in the application process. For example, the touch pen detects the force on the screen to determine whether the touch pen is being used. Alternatively, in the drawing process, the touch pen detects the force on the screen to control the thickness of the handwriting.

[0004] The pressure detection device of the touch pen includes a deformable frame and a strain gauge. The strain gauge is attached to the collection position of the deformable frame. In this way, when the pen tip of the touch pen is subjected to pressure, the pen tip will exert a force on the deformable frame to cause the deformable frame to deform, and the strain gauge will generate a corresponding strain. The strain gauge converts the strain signal into an electrical signal to obtain the current pressure value of the pen tip. However, the deformable frame usually adopts a parallelogram linkage structure, which makes the structure of the touch pen difficult. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a touch pen which can reduce the structural difficulty.

[0006] In a first aspect, the embodiments of the present application provide a touch pen, which comprises:

[0007] a pen barrel;

[0008] a pen stand arranged in the pen barrel;

[0009] a pen tip arranged in the pen stand and at least partially protruding from the pen barrel;

[0010] a main shaft assembly arranged in the pen stand and connected with the pen tip, the main shaft assembly being configured to enable the pen tip to move relative to the pen barrel in a predetermined direction when the touch pen is used to write on a screen;

[0011] a strain gauge;

[0012] a control assembly electrically connected to the strain gauge; and

[0013] The sensing support comprises a deformation beam and at least one cantilever connected to the deformation beam, the deformation beam extends along the preset direction and is connected to the pen holder, the at least one cantilever is connected to the main shaft assembly, the strain gauge is arranged on the deformation beam, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the strain gauge are elastically deformed, and then the control assembly detects the elastic deformation of the strain gauge to obtain the writing force of the pen head relative to the screen.

[0014] In a second aspect, the embodiments of the present application provide a strain gauge assembly; the strain gauge assembly is applied to a stylus, and the strain gauge assembly comprises:

[0015] The sensing support comprises a deformation beam and at least one cantilever connected to the deformation beam, the deformation beam extends along the preset direction and is connected to the pen holder, the at least one cantilever is connected to the main shaft assembly, the strain gauge is arranged on the deformation beam, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the strain gauge are elastically deformed, and then the control assembly detects the elastic deformation of the strain gauge to obtain the writing force of the pen head relative to the screen.

[0016] The sensing support comprises a deformation beam and at least one cantilever connected to the deformation beam, the deformation beam extends along the preset direction and is connected to the pen holder, the at least one cantilever is connected to the main shaft assembly, the strain gauge is arranged on the deformation beam, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the strain gauge are elastically deformed, and then the control assembly detects the elastic deformation of the strain gauge to obtain the writing force of the pen head relative to the screen.

[0017] From the above technical solutions, it can be seen that in the stylus and the strain gauge assembly of the embodiments of the present application, the sensing support is composed of a deformation beam and at least one cantilever, the strain gauge is arranged on the deformation beam, and the main shaft assembly is connected to the at least one cantilever. In this way, the overall structure of the sensing support is simple, the assembly difficulty of the sensing support in the stylus is effectively reduced, so that the manufacturing difficulty of the stylus is reduced. At the same time, as a key component of the stylus, the structure of the stylus is simpler, so that the cost of the stylus is effectively reduced.

[0018] Further, the sensing support is composed of a deformation beam and at least one cantilever, the occupied space of the sensing support in the cross section of the stylus is effectively reduced, therefore, the cross section of the pen barrel does not need to be designed to be large to meet the installation requirements of the sensing support, and the stylus can be made thinner. In application, a large accommodation groove does not need to be reserved on the shell of the electronic device to accommodate the stylus, so that the appearance of the electronic device is ensured.

[0019] Further, the main shaft assembly is connected with the at least one cantilever, so that the main shaft assembly is not easy to interfere with the movement of the at least one cantilever when acting on the at least one cantilever, thereby ensuring that the main shaft assembly can preferably push the elastic deformation beam to produce elastic deformation through the at least one cantilever, so as to drive the strain gauge to produce elastic deformation, and then the corresponding electric signal can be accurately obtained to be sent to the control assembly, and the control assembly can obtain the writing force of the pen tip relative to the screen according to the electric signal corresponding to the elastic deformation of the strain gauge, and the scheme can be better implemented.

[0020] In addition, the pen tip, the main shaft assembly, the sensing support, the strain gauge and the control assembly can be pre-installed on the pen holder during assembly of the stylus, and then the pen holder is installed in the pen barrel, so that the stylus is convenient to assemble. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 is a schematic diagram of the overall structure of the stylus according to an embodiment of the present application;

[0023] Fig. 2 is an exploded structural schematic diagram of the stylus according to the first embodiment of the present application;

[0024] Fig. 3 is an exploded schematic diagram of part of the structure of the stylus according to the first embodiment of the present application;

[0025] Fig. 4 is a structural schematic diagram of the sensing support and the strain gauge according to the first embodiment of the present application;

[0026] Fig. 5 is an assembly schematic diagram of part of the structure of the stylus according to the first embodiment of the present application;

[0027] Fig. 6 is an exploded structural schematic diagram of the stylus according to the second embodiment of the present application;

[0028] Fig. 7 is an exploded schematic diagram of part of the structure of the stylus according to the second embodiment of the present application;

[0029] Fig. 8 is an exploded structural schematic diagram of the sensing support and the strain gauge according to the second embodiment of the present application;

[0030] Fig. 9 is a structural schematic diagram of another strain gauge of the stylus according to the second embodiment of the present application;

[0031] Fig. 10 is an assembly schematic diagram of part of the structure of the stylus according to the second embodiment of the present application;

[0032] Fig. 11 is an exploded structural schematic diagram of the stylus in the third embodiment of the present application;

[0033] Fig. 12 is a partial structural exploded schematic diagram of the stylus in the third embodiment of the present application;

[0034] Fig. 13 is a structural schematic diagram of the sensing bracket and strain gauge in the stylus in the third embodiment of the present application;

[0035] Fig. 14 is a partial structural assembly schematic diagram of the stylus in the third embodiment of the present application;

[0036] Fig. 15 is a structural schematic diagram of a sensing bracket in the stylus in the third embodiment of the present application;

[0037] Fig. 16 is a structural schematic diagram of another sensing bracket and strain gauge in the stylus in the third embodiment of the present application;

[0038] Fig. 17 is a structural and assembly schematic diagram of another sensing bracket and strain gauge in the stylus in the third embodiment of the present application;

[0039] Fig. 18 is an exploded structural schematic diagram of the main shaft assembly of the stylus in the third embodiment of the present application.

[0040] Reference signs: 100, barrel; 200, bracket; 210, first bracket; 211, first boss; 212, second boss; 220, second bracket; 300, stylus tip; 400, main shaft assembly; 410, first shaft; 411, guide hole; 420, second shaft; 430, elastic member; 440, connecting head; 500, sensing bracket; 510, first cantilever; 520, deformation beam; 521, notched portion; 530, second cantilever; 531, arc-shaped protrusion; 540, static beam; 600, main board; 610, clearance notch; 700, strain gauge; 710, FPC; 711, strain segment; 712, connecting segment; 713, static segment; 720, first bridge arm resistor; 730, second bridge arm resistor; 800, first electrode; 810, first spring member; 820, first extension arm; 900, second electrode; 910, second spring member; 920, second extension arm; M'M', first direction; N'N', second direction. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals indicate like elements or elements having the same or similar function throughout the several disclosed embodiments. The embodiments described below are examples of the present application, and are not intended to limit the present application.

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, up, down and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting and the like should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The present application will be further described in detail below with reference to the accompanying drawings.

[0047] The touch pen provided by the embodiment of the present application can be a capacitive pen or an inductive pen, but is not limited to only the above two. The touch pen can be applied to various electronic devices with screens, such as mobile phones, tablets, tablet computers, all-in-one computers, notebooks and the like, which are not listed one by one.

[0048] Referring to FIGS. 1 to 4, the touch pen comprises a pen barrel 100, a pen holder 200, a pen head 300, a main shaft assembly 400, an induction support 500, a control assembly and a strain gauge 700.

[0049] The pen barrel 100 serves as the shell of the touch pen. The pen barrel 100 is in a cylindrical structure, and the specific material of the pen barrel 100 is not limited here, and the designer can reasonably select according to actual needs; for example, the material of the pen barrel 100 can include but is not limited to plastic.

[0050] The pen holder 200 is a support for the stylus, and is used to carry components such as the pen tip 300, the main shaft assembly 400, the sensing support 500, the control assembly, and the strain gauge 700. The specific structure of the pen holder 200 will be described below.

[0051] The pen holder 200 is arranged in the pen barrel 100. The specific connection between the pen holder 200 and the pen barrel 100 is not limited here, and the designer can make reasonable design according to actual needs; for example, the pen holder 200 can be, but is not limited to, detachably connected with the pen barrel 100 by at least one of the following modes: screwing, clamping, or inserting; for another example, the pen holder 200 can also be, but is not limited to, non-detachably connected with the pen barrel 100 by gluing.

[0052] The pen tip 300 is a nib of the stylus for contacting the screen. The pen tip 300 is arranged in the pen holder 200 and at least partially extends out of the pen barrel 100; for example, the pen tip 300 is axially slidingly arranged in the pen holder 200 and extends out of the head of the pen barrel 100.

[0053] The main shaft assembly 400 is used to enable the pen tip 300 to move relative to the pen barrel 100 in a preset direction when the stylus is used to write on the screen. The preset direction can be understood as the axial direction of the stylus, or the axial direction of the pen barrel 100.

[0054] The main shaft assembly 400 is arranged in the pen holder 200 and connected with the pen tip 300; for example, the main shaft assembly 400 is axially slidingly arranged in the pen holder 200, and the front end of the main shaft assembly 400 is connected with the connecting end (i.e., the rear end) of the pen tip 300.

[0055] The sensing support 500 is used to carry the strain gauge 700, and the sensing support 500 includes a deformation beam 520 and at least one cantilever connecting the deformation beam 520.

[0056] The deformation beam 520 extends in the preset direction and is connected with the pen holder 200. The deformation beam 520 can be directly connected with the pen holder 200, or indirectly connected with the pen holder 200 through other components (e.g., the first cantilever 510 described below).

[0057] The at least one cantilever is connected with the main shaft assembly 400, so that the cantilever (e.g., the second cantilever 530 described below) connected with the main shaft assembly 400 can move under the action of the main shaft assembly 400, so that the deformation beam 520 connected with the cantilever can elastically deform.

[0058] The strain gauge 700 is adapted to elastically deform together with the deformation beam 520 when the deformation beam 520 elastically deforms; the specific structure of the strain gauge 700 will be described below.

[0059] Strain gauge 700 is arranged on deformation beam 520, so that strain gauge 700 can also produce elastic deformation along with deformation beam 520 in the process of elastic deformation of deformation beam 520.

[0060] Control assembly is a control module of the stylus, and control assembly is electrically connected with strain gauge 700; for example, control assembly includes mainboard 600, and mainboard 600 is electrically connected with strain gauge 700.

[0061] When pen head 300 moves relative to pen barrel 100 along a preset direction, main shaft assembly 400 drives at least one cantilever to move, so that deformation beam 520 and strain gauge 700 produce elastic deformation, and then control assembly detects the elastic deformation of strain gauge 700 to obtain the writing force of pen head 300 relative to the screen.

[0062] In the process of pressure detection, the front end of pen head 300 is a writing end acting on the screen, and pen head 300 receives a corresponding reaction force from the screen, and pen head 300 transmits the reaction force to the cantilever through main shaft assembly 400, and because the cantilever is connected with deformation beam 520 and deformation beam 520 is connected with pen holder 200, the cantilever produces elastic deformation at the center position of the length direction of deformation beam 520 when the cantilever receives the force transmitted by pen head 300. In the process of deformation, strain gauge 700 also deforms correspondingly along with the elastic deformation of deformation beam 520, and strain gauge 700 converts the deformation into an electrical signal and sends the electrical signal to mainboard 600 of control assembly, and mainboard 600 of control assembly calculates the reaction force received by pen head 300, that is, the force of pen head 300 acting on the screen according to the received signal.

[0063] As can be seen from the above, sensing support 500 is composed of deformation beam 520 and at least one cantilever, strain gauge 700 is arranged on deformation beam 520, and main shaft assembly 400 is connected with the at least one cantilever, so that sensing support 500 has a simple overall structure, the assembly difficulty of sensing support 500 in the stylus is effectively reduced, so that the manufacturing difficulty of the stylus is reduced; at the same time, sensing support 500 is a key component in the stylus, and the structure of the stylus is simpler, so that the cost of the stylus is effectively reduced.

[0064] In addition, sensing support 500 is composed of deformation beam 520 and at least one cantilever, and the occupied space of sensing support 500 in the cross section of the stylus is effectively reduced, so that the cross section of pen barrel 100 does not need to be designed to be large to meet the installation requirements of sensing support 500, and the stylus can be made thinner. In application, a large accommodation groove does not need to be reserved on the shell of the electronic device to accommodate the stylus, so that the appearance of the electronic device is ensured.

[0065] In addition, the stylus can be assembled more conveniently by pre-installing the stylus tip 300, the main shaft assembly 400, the sensing bracket 500, the strain gauge 700 and the main board 600 on the stylus holder 200, and then installing the stylus holder 200 in the stylus barrel 100.

[0066] The specific structure of the strain gauge 700 is different for different structures of the sensing bracket 500. The specific structure design of the strain gauge 700 can include, but is not limited to, the following several embodiments.

[0067] Embodiment one

[0068] Referring to FIGS. 3 to 5, when the sensing bracket 500 is directly connected to the stylus holder 200, the sensing bracket 500 includes a deformation beam 520, and at least one cantilever includes a second cantilever 530. The second cantilever 530 is connected to one end of the deformation beam 520 close to the stylus tip 300. The main shaft assembly 400 abuts against the second cantilever 530. When the stylus tip 300 moves relative to the stylus barrel 100 along a preset direction, the main shaft assembly 400 drives the second cantilever 530 to move. At this time, the sensing bracket 500 is arranged in an L-shaped structure. The strain gauge 700 includes an electrical connector and at least one resistor. The electrical connector includes a strain segment 711 and a connecting segment 712 connected to each other. The strain segment 711 is arranged in close contact with one side of the deformation beam 520. The connecting segment 712 is electrically connected to the main board 600 of the control assembly. It can be understood that in this embodiment, the at least one resistor can be arranged on the strain segment 711. When the stylus tip 300 moves relative to the stylus barrel 100 along the preset direction, the main shaft assembly 400 drives the at least one cantilever to move, so that the deformation beam 520 and the at least one resistor are elastically deformed, so that the elastic deformation is detected, that is, the strain gauge 700 obtains the deformation amount according to the elastic deformation of the at least one resistor, and sends the corresponding electrical signal to the main board 600 of the control assembly.

[0069] The electrical connector is an FPC 710. The strain segment 711 and the connecting segment 712 are an integrally formed FPC structure. The at least one resistor is a printed resistor formed on the FPC 710 of the strain segment 711, or a sheet-shaped resistor wire arranged on the FPC 710 of the strain segment 711.

[0070] Further, in this embodiment, the at least one resistor can include two first bridge arm resistors 720. The two first bridge arm resistors 720 are arranged in a first direction MM' on the strain segment 711 to form a half-bridge on the electrical connector. When the stylus tip 300 moves relative to the stylus barrel 100 along the preset direction, the main shaft assembly 400 drives the at least one cantilever (such as the second cantilever 530) to move, so that the deformation beam 520 and the two first bridge arm resistors 720 are elastically deformed.

[0071] It should be noted that the main shaft assembly 400 and the second cantilever 530 are connected in abutment, so that the main shaft assembly 400 is less likely to interfere with the movement of the second cantilever 530 when acting on the second cantilever 530, thereby ensuring that the main shaft assembly 400 can better push the deformation beam 520 to produce elastic deformation through the second cantilever 530, that is, the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, thereby driving the strain gauge 700 to deform, and then the corresponding electrical signal can be accurately obtained to be sent to the mainboard 600 of the control assembly, and the present application scheme can be better implemented.

[0072] Specifically, the two first bridge arm resistors 720 can produce deformation when the deformation beam 520 deforms. The first bridge arm resistor 720 is a printed resistor arranged on the FPC 710, or the first bridge arm resistor 720 is a sheet-shaped resistor wire arranged on the FPC 710, which is arranged according to actual needs.

[0073] The deformation beam 520 is arranged in a sheet shape; the two first bridge arm resistors 720 are rectangular sheet-shaped bodies extending along the second direction NN', and the short edges at both ends of the two first bridge arm resistors 720 are electrically connected to the strain section 711. The second direction NN' is perpendicular to the first direction MM', and the second direction NN' is the same as the preset direction.

[0074] During the elastic deformation of the deformation beam 520, since the two first bridge arm resistors 720 are rectangular sheet-shaped bodies, the two first bridge arm resistors 720 also deform correspondingly with the deformation beam 520, thereby converting the elastic deformation of the deformation beam 520 into an electrical signal. Because the two first bridge arm resistors 720 form a half bridge on the FPC 710, the FPC 710 and the two first bridge arm resistors 720 form a half-bridge pressure sensor, and the half-bridge pressure sensor generates a corresponding pressure signal according to the electrical signal of the two first bridge arm resistors 720 and transmits it to the mainboard 600 of the control assembly. The mainboard 600 of the control assembly calculates the pressure received by the pen tip 300 according to the received pressure signal, that is, the force of the pen tip 300 on the screen.

[0075] Of course, referring to FIGS. 3-5, when the deformation beam 520 is indirectly connected with the pen holder 200, the at least one cantilever can further include a first cantilever 510 connected with a rear end of the deformation beam 520 (i.e., an end of the deformation beam 520 away from the pen tip 300), and the first cantilever 510 and the second cantilever 530 are located on the same side of the deformation beam 520. At this time, the induction bracket 500 is arranged in a U-shaped structure, and the deformation beam 520 is connected with the pen holder 200 through the first cantilever 510. The pen holder 200 includes a holder body, and the pen tip 300, the main shaft assembly 400, the induction bracket 500, and the main board 600 of the control assembly are sequentially arranged along a predetermined direction on the holder body. The first boss 211 and the second boss 212 are arranged at intervals on the holder body, and a positioning gap for the first cantilever 510 to be clamped is formed between the first boss 211 and the second boss 212. During assembly of the stylus, the pen tip 300, the main shaft assembly 400, the induction bracket 500, the strain gauge 700, and the main board 600 of the control assembly can be pre-installed on the pen holder 200, and then the pen holder 200 is installed in the pen barrel 100. In this way, the stylus is assembled more conveniently.

[0076] The induction bracket 500 is arranged in a U-shaped sheet structure. It can be understood that the induction bracket 500 adopts such a structure, first, the overall structure of the induction bracket 500 is simple, and accordingly, the induction bracket 500 saves space inside the pen barrel 100 when applied in the pen barrel 100. The pen barrel 100 can be made smaller in cross-section, and the induction bracket 500 is also more convenient to install. Second, the structure of the induction bracket 500 as a key component of the stylus is simplified, and accordingly, the manufacturing cost of the stylus is effectively reduced.

[0077] The strain section 711 is arranged on a side of the deformation beam 520 opposite to the first cantilever 510 and the second cantilever 530. Alternatively, the strain section 711 is arranged on the same side of the deformation beam 520 as the first cantilever 510 and the second cantilever 530, and the strain section 711 is located between the first cantilever 510 and the second cantilever 530. It is worth noting that the strain gauge 700 as a key component of the stylus is only arranged on one side of the deformation beam 520 in the present application, while a common strain gauge 700 is usually arranged on both sides of the deformation beam 520. In this way, the structural complexity of the strain gauge 700 is simplified, and the installation structure of the strain gauge 700 is effectively reduced, and the manufacturing process of the stylus is also effectively reduced.

[0078] One of the side wall of the second cantilever 530 and the end of the main shaft assembly 400 is provided with an arc-shaped protrusion 531, and the arc-shaped protrusion 531 abuts against the other one of the side wall of the second cantilever 530 and the end of the main shaft assembly 400. For example, the front side of the second cantilever 530 can be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531; for another example, the rear end of the main shaft assembly 400 can also be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531. It can be understood that the second cantilever 530 and the main shaft assembly 400 abut against each other through the arc-shaped protrusion 531, so that when the main shaft assembly 400 acts on the second cantilever 530, the main shaft assembly 400 is less likely to interfere with the movement of the second cantilever 530, thereby ensuring that the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, and then the corresponding electrical signal can be accurately obtained to input the mainboard 600 of the control assembly.

[0079] In order to further facilitate the installation of the stylus, referring to FIGS. 3-5, the frame body includes a first support 210 and a second support 220 that are coupled to each other, wherein the pen head 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700, and the mainboard 600 of the control assembly are sequentially arranged on one side of the first support 210 close to the second support 220. The second support 220 is coupled to the first support 210, and the second support 220 is used to keep the pen head 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700, and the mainboard 600 of the control assembly on the first support 210, so that the pen head 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700, and the mainboard 600 of the control assembly are installed more conveniently.

[0080] The first boss 211 and the second boss 212 are arranged on one side of the first support 210 close to the second support 220, and the first boss 211 is located in front of the second boss 212 (i.e., the first boss 211 is closer to the pen head 300 than the second boss 212) to form a positioning gap therebetween. When the sensing support 500 is installed on the first support 210, the first cantilever 510 is fixedly clamped into the positioning gap between the first boss 211 and the second boss 212, so that the sensing support 500 is conveniently installed on the first support 210.

[0081] Embodiment Two

[0082] Referring to FIGS. 6-8, when the induction bracket 500 is directly connected with the pen holder 200, the induction bracket 500 comprises a deformation beam 520, at least one cantilever comprises a second cantilever 530, the second cantilever 530 is connected with the deformation beam 520 at one end close to the pen head 300, the main shaft assembly 400 abuts against the second cantilever 530, when the pen head 300 moves relative to the pen barrel 100 along a preset direction, the main shaft assembly 400 drives the second cantilever 530 to move, at this time, the induction bracket 500 is arranged in an L-shaped structure. The strain gauge 700 comprises an electrical connector and at least one resistor, the at least one resistor comprises four bridge arm resistors, wherein the electrical connector comprises a strain segment 711 and a connecting segment 712 connected with each other, the strain segment 711 is arranged in close contact with one side of the deformation beam 520, and the connecting segment 712 is electrically connected with the main board 600 of the control assembly. The four bridge arm resistors are arranged on the strain segment 711 to form an electric bridge on the electrical connector, and the four bridge arm resistors are arranged in a sheet shape to be able to produce deformation when the deformation beam 520 deforms. It can be understood that in the embodiment, the four bridge arm resistors are arranged on the strain segment 711, when the pen head 300 moves relative to the pen barrel 100 along a preset direction, the main shaft assembly 400 drives at least one cantilever to move, so that the deformation beam 520 and the four bridge arm resistors produce elastic deformation, so that the elastic deformation is detected, that is, the strain gauge 700 obtains the deformation amount according to the elastic deformation of the four bridge arm resistors, and sends the corresponding electrical signal to the main board 600 of the control assembly.

[0083] Wherein the electrical connector is an FPC 710, and the strain segment 711 and the connecting segment 712 are an integrally formed FPC structure. The at least one resistor is a printed resistor formed on the FPC 710 of the strain segment 711, or a sheet-shaped resistor wire arranged on the FPC 710 of the strain segment 711.

[0084] It should be noted that the main shaft assembly 400 and the second cantilever 530 adopt an abutting connection mode, so that when the main shaft assembly 400 acts on the second cantilever 530, it is not easy to interfere with the movement of the second cantilever 530, thereby ensuring that the main shaft assembly 400 can better push the deformation beam 520 to produce elastic deformation through the second cantilever 530, that is, the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, thereby driving the strain gauge 700 to deform, and then the corresponding electrical signal can be accurately obtained to be sent to the main board 600, and the present application scheme can be better implemented.

[0085] The four bridge arm resistors are also deformed correspondingly with the deformation beam 520 during the elastic deformation of the deformation beam 520, so as to convert the elastic deformation of the deformation beam 520 into an electrical signal. Since the four bridge arm resistors form an electric bridge on the FPC 710, the FPC 710 and the four bridge arm resistors form a bridge pressure sensor. The bridge pressure sensor generates a corresponding pressure signal according to the electrical signal of the four bridge arm resistors and transmits the pressure signal to the mainboard 600. The mainboard 600 calculates the pressure on the pen tip 300 according to the received pressure signal, i.e., the force of the pen tip 300 on the screen.

[0086] The at least one resistor (such as the four bridge arm resistors) includes two first bridge arm resistors 720 and two second bridge arm resistors 730. The two first bridge arm resistors 720 are arranged at intervals along a first direction MM' on the strain section 711, and the two second bridge arm resistors 730 are arranged at intervals along a second direction NN' on the strain section 711. The two first bridge arm resistors 720 and the two second bridge arm resistors 730 form an electric bridge on the electrical connector. When the pen tip 300 moves relative to the pen barrel 100 along a preset direction, the main shaft assembly 400 drives the at least one cantilever (such as the second cantilever 530) to move, so that the deformation beam 520, the two first bridge arm resistors 720, and the two second bridge arm resistors 730 are elastically deformed. The first direction MM' intersects the second direction NN'.

[0087] Specifically, the two first bridge arm resistors 720 can be deformed when the deformation beam 520 is deformed, and the two second bridge arm resistors 730 can be deformed when the deformation beam 520 is deformed. The first bridge arm resistor 720 / second bridge arm resistor 730 is a printed resistor arranged on the FPC 710, or the first bridge arm resistor 720 / second bridge arm resistor 730 is a sheet-shaped resistor wire arranged on the FPC 710, which is arranged according to actual needs.

[0088] The two first bridge arm resistors 720 are sheet-shaped bodies in a rectangular shape, and the short edges at both ends of the two first bridge arm resistors 720 are electrically connected to the strain section 711. The two second bridge arm resistors 730 are sheet-shaped bodies in a rectangular shape, and the short edges at both ends of the two second bridge arm resistors 730 are electrically connected to the strain section 711. The first direction MM' is perpendicular to the second direction NN'.

[0089] Of course, referring to FIGS. 6-8, when the deformation beam 520 is indirectly connected with the pen holder 200, the at least one cantilever can further include a first cantilever 510 connected with a rear end of the deformation beam 520 (i.e., an end of the deformation beam 520 away from the pen tip 300), and the first cantilever 510 and the second cantilever 530 are located on the same side of the deformation beam 520, at which time the induction bracket 500 is arranged in a U-shaped structure, and the deformation beam 520 is connected with the pen holder 200 through the first cantilever 510. The pen holder 200 includes a holder body, a first boss 211 and a second boss 212, and the pen tip 300, the main shaft assembly 400, the induction bracket 500 and the main board 600 of the control assembly are sequentially arranged in a predetermined direction on the holder body, the first boss 211 and the second boss 212 are arranged on the holder body in a spaced manner, and a positioning gap for the first cantilever 510 to be clamped into is formed between the first boss 211 and the second boss 212. During assembly of the stylus, the pen tip 300, the main shaft assembly 400, the induction bracket 500, the strain gauge 700 and the main board 600 of the control assembly can be pre-installed on the pen holder 200, and then the pen holder 200 is installed in the pen barrel 100. In this way, the stylus is assembled more conveniently.

[0090] The induction bracket 500 is arranged in a U-shaped sheet structure. It can be understood that the induction bracket 500 adopts such a structural form, firstly, the overall structure of the induction bracket 500 is simple, and accordingly, when the induction bracket 500 is applied in the pen barrel 100, the inside space of the pen barrel 100 is saved, the pen barrel 100 can be made smaller in cross-section, and the induction bracket 500 is also more convenient to install. Secondly, as a key component of the stylus, the structure of the induction bracket 500 is simplified, and accordingly, the manufacturing cost of the stylus is effectively reduced.

[0091] One of the side wall of the second cantilever 530 and the end of the main shaft assembly 400 is provided with an arc-shaped protrusion 531, and the arc-shaped protrusion 531 abuts against the other of the side wall of the second cantilever 530 and the end of the main shaft assembly 400. For example, the front side of the second cantilever 530 can be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531; for another example, the rear end of the main shaft assembly 400 can also be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531. It can be understood that the second cantilever 530 abuts against the main shaft assembly 400 through the arc-shaped protrusion 531, and in this way, when the main shaft assembly 400 acts on the second cantilever 530, the main shaft assembly 400 is less likely to interfere with the movement of the second cantilever 530, thereby ensuring that the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, and in turn, the corresponding electrical signal can be accurately obtained to be input to the main board 600 of the control assembly.

[0092] In order to further facilitate the installation of the stylus, referring to FIGS. 6 and 7, the frame body comprises a first support 210 and a second support 220 which are coupled to each other, wherein the stylus tip 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700 and the main board 600 of the control assembly are sequentially arranged on the side of the first support 210 close to the second support 220. The second support 220 is coupled to the first support 210, and the second support 220 is used to keep the stylus tip 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700 and the main board 600 of the control assembly on the first support 210, so that the stylus tip 300, the main shaft assembly 400, the sensing support 500, the strain gauge 700 and the main board 600 of the control assembly are installed more conveniently.

[0093] The first boss 211 and the second boss 212 are arranged on the side of the first support 210 close to the second support 220, and the first boss 211 is located in front of the second boss 212 (i.e., the first boss 211 is closer to the stylus tip 300 than the second boss 212) to form a positioning gap therebetween. When the sensing support 500 is installed on the first support 210, the first cantilever 510 is fixedly clamped into the positioning gap between the first boss 211 and the second boss 212, so that the sensing support 500 is conveniently installed on the first support 210.

[0094] More specifically, referring to FIG. 8, the first bridge arm resistor 720 is a rectangular sheet-shaped body extending along the second direction NN', and the second bridge arm resistor 730 is a rectangular sheet-shaped body extending along the first direction MM', and the first direction MM' is the same as the preset direction. At this time, the long sides of the two first bridge arm resistors 720 are arranged perpendicular to the sides of the deformation beam 520, and the long sides of the two second bridge arm resistors 730 are arranged parallel to the sides of the deformation beam 520. When the deformation beam 520 is deformed, the first bridge arm resistor 720 is deformed in the width direction thereof, the length of the first bridge arm resistor 720 is reduced, and accordingly, the resistance of the first bridge arm resistor 720 is reduced, so that the first bridge arm resistor 720 generates a negative strain; at the same time, the second bridge arm resistor 730 is deformed in the length direction thereof, the length of the second bridge arm resistor 730 is increased, and accordingly, the resistance of the second bridge arm resistor 730 is increased, so that the second bridge arm resistor 730 generates a positive strain. The main board 600 of the control assembly receives the electrical signal of the negative strain of the first bridge arm resistor 720 and the electrical signal of the positive strain of the second bridge arm resistor 730, so as to accurately calculate the bending condition of the deformation beam 520, and thus determine the acting force of the stylus tip 300.

[0095] Further, a first bridge arm resistor 720 is arranged on the deformation beam 520 near the first cantilever 510, another first bridge arm resistor 720 is arranged on the deformation beam 520 near the second cantilever 530, and the two first bridge arm resistors 720 are symmetrically arranged about the bisector plane, where the bisector plane refers to a plane equidistantly located between the first cantilever 510 and the second cantilever 530, and the bisector plane also bisects the deformation beam 520. The two second bridge arm resistors 730 are arranged in the space between the two first bridge arm resistors 720, the center of the long side of each second bridge arm resistor 730 corresponds to the center of the side of the deformation beam 520, and the distance between each first bridge arm resistor 720 and second bridge arm resistor 730 is the same, that is, the center of the long side of the second bridge arm resistor 730 is located on the bisector plane.

[0096] It can be understood that, during the deformation of the deformation beam 520, the two first bridge arm resistors 720 are symmetrically arranged on both sides of the bisector plane, and the deformation degree of the two first bridge arm resistors 720 is basically the same to generate the same negative strain; at the same time, the two second bridge arm resistors 730 are located at the center of the deformation beam 520, so the deformation degree of the two second bridge arm resistors 730 is basically the same to generate the same positive strain. The main board 600 of the control assembly receives the same negative strain and the same positive strain at the same time, so that the main board 600 of the control assembly can calculate the bending condition of the deformation beam 520 based on the electrical signals detected by the first bridge arm resistor 720 and the second bridge arm resistor 730, thereby determining the acting force of the stylus tip 300.

[0097] In addition, the first bridge arm resistor 720 and the second bridge arm resistor 730 adopt the above structure, the two second bridge arm resistors 730 are located in the gap space between the two first bridge arm resistors 720, so that the two first bridge arm resistors 720 and the two second bridge arm resistors 730 are compactly assembled on the strain section 711, and the deformation beam 520 does not need to be arranged with a larger length and width to meet the installation of the first bridge arm resistor 720 and the second bridge arm resistor 730, so that the size of the sensing support 500 is effectively reduced.

[0098] More specifically, referring to FIG. 9, the first bridge arm resistor 720 is a rectangular sheet extending along the first direction MM', and the second bridge arm resistor 730 is a rectangular sheet extending along the second direction NN', which is the same as the preset direction. In this case, the long sides of the two first bridge arm resistors 720 are arranged perpendicularly to the sides of the deformation beam 520, and the long sides of the two second bridge arm resistors 730 are arranged in parallel to the sides of the deformation beam 520. When the deformation beam 520 deforms, the first bridge arm resistor 720 deforms in the width direction thereof, the length of the first bridge arm resistor 720 is reduced, and accordingly, the resistance of the first bridge arm resistor 720 is reduced, so that the first bridge arm resistor 720 generates a negative strain. Meanwhile, the second bridge arm resistor 730 deforms in the length direction thereof, the length of the second bridge arm resistor 730 is increased, and accordingly, the resistance of the second bridge arm resistor 730 is increased, so that the second bridge arm resistor 730 generates a positive strain. The main board 600 of the control assembly receives the electrical signal of the negative strain of the first bridge arm resistor 720 and the electrical signal of the positive strain of the second bridge arm resistor 730, so as to accurately calculate the bending condition of the deformation beam 520, and thus determine the acting force of the stylus tip 300.

[0099] Further, one second bridge arm resistor 730 is arranged at the position of the deformation beam 520 close to the first cantilever 510, and the other second bridge arm resistor 730 is arranged at the position of the deformation beam 520 close to the second cantilever 530, and the two second bridge arm resistors 730 are symmetrically arranged about the bisecting plane, which is a plane equidistantly located between the first cantilever 510 and the second cantilever 530 and bisects the deformation beam 520. The two first bridge arm resistors 720 are located between the two second bridge arm resistors 730, the center of the short side of each first bridge arm resistor 720 is located at the center of the side of the deformation beam 520, and the distance between each first bridge arm resistor 720 and the second bridge arm resistor 730 is the same, i.e., the center of the short side of the first bridge arm resistor 720 is located on the bisecting plane. Therefore, during the deformation of the deformation beam 520, the deformation degree of the two first bridge arm resistors 720 is basically the same to generate the same negative strain, and the deformation degree of the two second bridge arm resistors 730 is basically the same to generate the same positive strain, so that the main board 600 of the control assembly simultaneously receives the same negative strain and positive strain.

[0100] Referring to FIG. 8, the center position of the long side of the second bridge arm resistor 730 corresponds to the center position of the side of the deformation beam 520, referring to FIG. 9, the center position of the short side of the first bridge arm resistor 720 corresponds to the center position of the side of the deformation beam 520, referring to FIG. 8 and FIG. 9, the two sides of the deformation beam 520 are provided with arc-shaped notched portions 521 at the center positions, and the lowest points of the notched portions 521 correspond to the center positions of the sides of the deformation beam 520. It can be understood that by providing the notched portions 521 at the center positions of the sides of the deformation beam 520, the notched portions 521 increase the sensitivity of the deformation beam 520 at the center positions, and therefore, when the deformation beam 520 is acted on by the spindle assembly 400, it can be deformed sensitively at the center positions, thereby driving the bridge arm resistor to deform greatly to generate a large enough electrical signal to be transmitted to the main board 600 of the control assembly, so as to accurately calculate the pressure value.

[0101] Referring to FIG. 7, FIG. 8 and FIG. 10, the first cantilever 510 and the second cantilever 530 are arranged on the same side of the sensing bracket 500, more specifically, the first cantilever 510 and the second cantilever 530 are located on the side of the sensing bracket 500 away from the second bracket 220, and the strain segment 711 of the strain gauge 700 is arranged on the other side of the sensing bracket 500. It can be understood that the first cantilever 510 and the second cantilever 530 are arranged on the same side of the sensing bracket 500, and the strain gauge 700 is arranged on the other side of the sensing bracket 500. In this way, the interference between the strain gauge 700 and the first cantilever 510 and the second cantilever 530 is effectively avoided, thereby facilitating the arrangement of the strain gauge 700 on the sensing bracket 500 to be connected to the main board 600 of the control assembly; and the sensing bracket 500 adopts such a structural form that the projections of the first cantilever 510 and the second cantilever 530 in the axial direction overlap, the sensing bracket 500 occupies a small space in the area of the cross section of the stylus, and the stylus can be made smaller in size. Of course, the first cantilever 510, the second cantilever 530 and the strain segment 711 can also be arranged on the same side of the deformation beam 520, i.e. the strain segment 711 is located between the first cantilever 510 and the second cantilever 530.

[0102] Embodiment three

[0103] Referring to FIGS. 11-13, when the induction bracket 500 is directly connected with the pen holder 200, the induction bracket 500 comprises a deformation beam 520, at least one cantilever comprises a second cantilever 530, the second cantilever 530 is connected with the deformation beam 520 at one end close to the pen head 300, the main shaft assembly 400 abuts against the second cantilever 530, when the pen head 300 moves relative to the pen barrel 100 along a preset direction, the main shaft assembly 400 drives the second cantilever 530 to move, at this time, the induction bracket 500 is arranged in an L-shaped structure. The strain gauge 700 comprises an electrical connector and at least one resistor, the at least one resistor comprises two first bridge arm resistors 720 and two second bridge arm resistors 730, wherein the electrical connector comprises a strain segment 711, a static segment 713 and a connecting segment 712 connected in sequence, the strain segment 711 is arranged in close contact with one side of the deformation beam 520, the static segment 713 is arranged separately from the deformation beam 520, and the connecting segment 712 is electrically connected with the main board 600 of the control assembly. The two first bridge arm resistors 720 are arranged in the first direction MM' and spaced apart on the strain segment 711, the two second bridge arm resistors 730 are arranged in the first direction MM' and spaced apart on the static segment 713, the two first bridge arm resistors 720 and the two second bridge arm resistors 730 form an electrical bridge on the electrical connector, and the two first bridge arm resistors 720 can produce elastic deformation when the deformation beam 520 deforms, and the two second bridge arm resistors 730 can not produce elastic deformation when the deformation beam 520 deforms. The main shaft assembly 400 drives the second cantilever 530 to move, so that the deformation beam 520 and the two first bridge arm resistors 720 produce elastic deformation. It can be understood that in the embodiment, the two first bridge arm resistors 720 are arranged on the strain segment 711, and the two second bridge arm resistors 730 are arranged on the static segment 713, when the pen head 300 moves relative to the pen barrel 100 along a preset direction, the main shaft assembly 400 drives at least one cantilever to move, so that the deformation beam 520 and the two first bridge arm resistors 720 produce elastic deformation, so that the elastic deformation is detected, that is, the strain gauge 700 obtains the deformation amount according to the elastic deformation of the two first bridge arm resistors 720, and sends the corresponding electrical signal to the main board 600 of the control assembly.

[0104] Wherein the electrical connector is FPC 710, and the strain segment 711 and the connecting segment 712 are an integral FPC structure. The at least one resistor is a printed resistor formed on the FPC 710, or a sheet resistor wire arranged on the FPC 710.

[0105] Specifically, the first bridge arm resistor 720 / second bridge arm resistor 730 is a printed resistor arranged on the FPC 710, or a sheet resistor wire arranged on the FPC 710, which is arranged according to actual needs.

[0106] It should be noted that the main shaft assembly 400 and the second cantilever 530 adopt the abutting connection mode, so that the main shaft assembly 400 is not easy to interfere with the movement of the second cantilever 530 when acting on the second cantilever 530, thereby ensuring that the main shaft assembly 400 can better push the deformation beam 520 to produce elastic deformation through the second cantilever 530, that is, the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, thereby driving the strain gauge 700 to deform, and then the corresponding electrical signal can be accurately obtained to be sent to the mainboard 600 of the control assembly, and the present application scheme can be better implemented.

[0107] In the deformation process of the deformation beam 520, the two first bridge arm resistors 720 also deform correspondingly with the deformation beam 520, so as to convert the elastic deformation of the deformation beam 520 into an electrical signal. Meanwhile, the static section 713 is separately arranged from the deformation beam 520, and the two second bridge arm resistors 730 always remain unchanged. Because the two first bridge arm resistors 720 and the two second bridge arm resistors 730 constitute an electric bridge, the FPC 710, the two first bridge arm resistors 720 and the two second bridge arm resistors 730 constitute a bridge pressure sensor. The bridge pressure sensor generates a corresponding pressure signal according to the electrical signals of the first bridge arm resistor 720 and the two second bridge arm resistors 730, and transmits the pressure signal to the mainboard 600 of the control assembly. The mainboard 600 of the control assembly calculates the pressure received by the pen tip 300 according to the received pressure signal, that is, the force of the pen tip 300 acting on the screen.

[0108] The FPC 710 is provided with the strain section 711 and the static section 713, the two first bridge arm resistors 720 are arranged on the strain section 711, and the two second bridge arm resistors 730 are arranged on the static section 713. In this way, when the strain gauge 700 is applied to the sensing support 500, only the positive strain or negative strain of the strain gauge 700 needs to be considered. Therefore, the sensing support 500 does not need to be provided with a relatively complex structure to meet the strain gauge 700, for example, a parallelogram linkage structure does not need to be provided, and the structure of the sensing support 500 is simplified. Therefore, the occupied space of the sensing support 500 in the cross section of the stylus is effectively reduced, and the cross section of the pen barrel 100 does not need to be designed to be relatively large to meet the installation requirements of the sensing support 500, so that the stylus can be made thinner. In application, the shell of the electronic device does not need to be provided with a relatively large accommodation groove to accommodate the stylus, thereby ensuring the appearance of the electronic device.

[0109] Of course, referring to FIG. 13 and FIG. 14, when the deformation beam 520 is indirectly connected with the pen holder 200, the at least one cantilever can further include a first cantilever 510 connected with the end of the deformation beam 520 away from the pen tip. The sensing bracket 500 can further include a static beam 540, the static beam 540 and the deformation beam 520 are arranged on one side of the pen holder 200 along a preset direction, the first cantilever 510 is connected with the front end of the static beam 540 (i.e. the end of the static beam 540 close to the pen tip 300) and the pen holder 200, the first cantilever 510 and the second cantilever 530 are located on the same side of the deformation beam 520 and the static beam 540, and the static segment 713 is arranged on the static beam 540, at this time, the sensing bracket 500 is arranged in an F-shaped structure, and the deformation beam 520 is connected with the pen holder 200 through the first cantilever 510.

[0110] During detection, the front end of the pen tip 300 acts on the screen as a writing end, the pen tip 300 receives a corresponding reaction force from the screen, and the pen tip 300 transmits the reaction force to the second cantilever 530 through the main shaft assembly 400. Because the first cantilever 510 is in a relatively fixed state with the pen holder 200, when the second cantilever 530 receives the force transmitted by the pen tip 300, the deformation beam 520 elastically deforms at the center position in the length direction thereof. During deformation of the deformation beam 520, the two first bridge arm resistors 720 also deform correspondingly, thereby converting the elastic deformation of the deformation beam 520 into an electrical signal. The static segment 713 is arranged on the static beam 540 to be separated from the deformation beam 520, and the two second bridge arm resistors 730 remain unchanged.

[0111] As can be seen from the above, the sensing bracket 500 is composed of the first cantilever 510, the deformation beam 520, the second cantilever 530 and the static beam 540, the strain segment 711 is arranged on the deformation beam 520, the static segment 713 is arranged on the static beam 540, and the main shaft assembly 400 abuts against the second cantilever 530. In this way, the overall structure of the sensing bracket 500 is simple, the assembly difficulty of the sensing bracket 500 in the stylus is effectively reduced, thereby effectively reducing the manufacturing difficulty of the stylus; at the same time, as a key component of the stylus, the structure of the stylus is simpler, thereby effectively reducing the cost of the stylus.

[0112] In addition, the sensing bracket 500 is composed of the first cantilever 510, the deformation beam 520, the static beam 540 and the second cantilever 530, and the occupied space of the sensing bracket 500 in the cross section of the stylus is effectively reduced. Therefore, the cross section of the pen barrel 100 does not need to be designed to be large to meet the installation requirements of the sensing bracket 500, and the stylus can be made thinner. In application, a large accommodation groove does not need to be reserved on the shell of the electronic device to accommodate the stylus, thereby ensuring the appearance of the electronic device.

[0113] It should be noted that when the induction bracket 500 includes the deformation beam 520 and the at least one cantilever includes the second cantilever 530 (at this time, the induction bracket 500 is arranged in an L-shaped structure), or when the induction bracket 500 includes the deformation beam 520 and the at least one cantilever includes the first cantilever 510 and the second cantilever 530 (that is, the induction bracket 500 is arranged in a U-shaped structure, refer to FIG. 15), the static section 713 can be arranged on the pen holder 200, or the static section 713 can be arranged on the mainboard 600 of the control assembly, which is arranged according to actual needs. Referring to FIG. 16, for example, the pen holder 200 is provided with a mounting boss 213, the mounting boss 213 is located between the induction bracket 500 and the mainboard 600 of the control assembly, and the first cantilever 510 is fixedly connected to the side of the mounting boss 213 away from the mainboard 600 of the control assembly. The mounting boss 213 has a mounting surface which is substantially the same as the back of the deformation beam 520. The strain section 711 is arranged on the back of the deformation beam 520, and the static section 713 is arranged on the mounting surface of the mounting boss 213. It can be understood that through the arrangement of the mounting boss 213, the mounting boss 213 can serve as a mounting carrier, thereby facilitating the installation of the induction bracket 500. At the same time, the mounting surface of the mounting boss 213 also facilitates the arrangement of the static section 713 to be connected to the mainboard 600 of the control assembly.

[0114] More specifically, referring to FIG. 14, the first bridge arm resistor 720 is a rectangular sheet body extending along the second direction NN', and the short sides of the two first bridge arm resistors 720 are electrically connected to the strain section 711. The second bridge arm resistor 730 is a rectangular sheet body extending along the second direction NN', and the short sides of the two second bridge arm resistors 730 are electrically connected to the static section 713. The second direction NN' is perpendicular to the first direction MM', and the second direction NN' is the same as the preset direction, at this time, the long sides of the two first bridge arm resistors 720 are arranged in parallel with the side of the deformation beam 520. It should be noted that the side of the deformation beam 520 can be understood as the connecting line of the first cantilever 510 to the second cantilever 530, and the center position of the long side of the first bridge arm resistor 720 corresponds to the center position of the side of the deformation beam 520. Therefore, when the deformation beam 520 is bent, the deformation beam 520 deforms in the length direction, thereby causing the first bridge arm resistor 720 to deform and switch to transmit an electrical signal to the mainboard 600 of the control assembly. If the short sides of the two first bridge arm resistors 720 are arranged in parallel with the side of the deformation beam 520, the center position of the short side of the first bridge arm resistor 720 corresponds to the center position of the side of the deformation beam 520. Therefore, when the deformation beam 520 is bent, the deformation beam 520 deforms in the width direction, thereby causing the first bridge arm resistor 720 to deform and switch to transmit an electrical signal to the mainboard 600 of the control assembly.

[0115] Further, the center position of the long side of the first bridge arm resistor 720 corresponds to the center position of the side of the deformation beam 520, and the deformation beam 520 is provided with an arc-shaped notch portion 521 at the center position of the side (see FIG. 15), and the lowest point of the notch portion 521 corresponds to the center position of the side of the deformation beam 520. It can be understood that by providing the notch portion 521 at the center position of the side of the deformation beam 520, the notch portion 521 increases the sensitivity of the deformation beam 520 at the center position, and thus when the deformation beam 520 is subjected to the action of the spindle assembly 400, the deformation beam 520 can be deformed sensitively at the center position, thereby driving the first bridge arm resistor 720 to deform by a large arc to generate a large enough electrical signal to the main board 600 of the control assembly, so as to accurately calculate the pressure value.

[0116] Referring to FIGS. 12 to 14, the pen holder 200 includes a holder body, a first boss 211 and a second boss 212, the pen tip 300, the spindle assembly 400, the sensing bracket 500 and the main board 600 of the control assembly are sequentially arranged on the holder body in the axial direction, the first boss 211 and the second boss 212 are arranged at intervals on the holder body, and a positioning gap for the first cantilever 510 to be clamped is formed between the first boss 211 and the second boss 212. In the assembly process of the stylus, the pen tip 300, the spindle assembly 400, the sensing bracket 500, the strain gauge 700 and the main board 600 of the control assembly can be pre-installed on the pen holder 200, and then the pen holder 200 is installed in the pen barrel 100. In this way, the stylus is assembled more conveniently.

[0117] In order to further facilitate the installation of the stylus, the holder body includes a first support 210 and a second support 220 that are buckled to each other, wherein the pen tip 300, the spindle assembly 400, the sensing bracket 500, the strain gauge 700 and the main board 600 of the control assembly are sequentially arranged on one side of the first support 210 close to the second support 220. The second support 220 is buckled to the first support 210, and the second support 220 is used to keep the pen tip 300, the spindle assembly 400, the sensing bracket 500, the strain gauge 700 and the main board 600 of the control assembly on the first support 210. Thus, the pen tip 300, the spindle assembly 400, the sensing bracket 500, the strain gauge 700 and the main board 600 of the control assembly are installed more conveniently.

[0118] The first boss 211 and the second boss 212 are arranged on one side of the first support 210 close to the second support 220, and the first boss 211 is arranged in front of the second boss 212 at intervals (i.e., the first boss 211 is closer to the pen tip 300 than the second boss 212), so as to form a positioning gap therebetween. When the sensing bracket 500 is installed on the first support 210, the first cantilever 510 is clamped into the positioning gap between the first boss 211 and the second boss 212. In this way, the sensing bracket 500 is conveniently installed on the first support 210.

[0119] Referring to FIG. 13 and FIG. 14, the first cantilever 510 includes a first fixed sheet 511, a second fixed sheet 512 and a bending portion 513. The first fixed sheet 511 and the second fixed sheet 512 are located on the same side of the deformation beam 520 and the static beam 540. The first fixed sheet 511 is connected to the rear end of the deformation beam 520 (i.e. the end of the deformation beam 520 away from the pen head 300). The second fixed sheet 512 is connected to the front end of the static beam 540 (i.e. the end of the static beam 540 close to the pen head 300). The first fixed sheet 511 and the second fixed sheet 512 are arranged in parallel to form a positioning gap. One end of the bending portion 513 is connected to the end of the first fixed sheet 511 away from the deformation beam 520. The other end of the bending portion 513 is connected to the end of the second fixed sheet 512 away from the static beam 540. The first fixed sheet 511 and the second fixed sheet 512 form a deformation gap therebetween.

[0120] Therefore, when the sensing bracket 500 is mounted on the first bracket 210, the first fixed sheet 511 and the second fixed sheet 512 are simultaneously clamped into the positioning gap between the first boss 211 and the second boss 212. The first fixed sheet 511 abuts against the side surface of the first boss 211. The second fixed sheet 512 abuts against the side surface of the second boss 212. The first fixed sheet 511 and the second fixed sheet 512 form a deformation gap therebetween. The first fixed sheet 511 and the second fixed sheet 512 can be elastically deformed relative to each other, so as to be stably clamped into the positioning gap between the first boss 211 and the second boss 212.

[0121] It should be noted that the first cantilever 510 adopts the structure of the first fixed sheet 511 and the second fixed sheet 512, and is connected by the bending portion 513. In this way, when the deformation beam 520 is deformed by the main shaft assembly 400, the first cantilever 510 can consume power by the bending portion 513, and prevent the reaction force from being transmitted to the static beam 540 by the second fixed sheet 512, so as to prevent the static beam 540 from being slightly deformed, and further prevent the second bridge arm resistor 730 from being deformed.

[0122] In other embodiments, referring to FIG. 17, the first cantilever 510 can also be arranged as a plate-shaped body between the deformation beam 520 and the static beam 540. In this way, the sensing bracket 500 has a simple structure and is convenient to assemble.

[0123] Further, referring to FIG. 13 and FIG. 14, the induction bracket 500 further comprises a third cantilever 550, the third cantilever 550 is a sheet body, one end of the third cantilever 550 is connected to the rear end of the static beam 540 (i.e. the end of the static beam 540 away from the pen head 300), and a fixed gap is formed between the first cantilever 510 and the third cantilever 550 for the second boss 212 to be clamped into. Therefore, when the induction bracket 500 is assembled to the first bracket 210, the second boss 212 is clamped and fixed in the fixed gap between the first cantilever 510 and the third cantilever 550. In this way, the third cantilever 550 further fixes the position of the static beam 540, thereby preventing the static beam 540 from being bent, and avoiding the deformation of the second bridge resistor 730; and the induction bracket 500 is also more convenient to assemble with the first bracket 210.

[0124] The first cantilever 510, the second cantilever 530 and the third cantilever 550 are arranged on the same side of the induction bracket 500, more specifically, the first cantilever 510, the second cantilever 530 and the third cantilever 550 are located on the side of the induction bracket 500 away from the second bracket 220, and the strain segment 711 and the static segment 713 are arranged on the other side of the induction bracket 500, i.e. the strain segment 711 is arranged on the side of the deformation beam 520 away from the first bracket 210, and the static segment 713 is arranged on the side of the static segment 713 away from the first bracket 210. It can be understood that the first cantilever 510, the second cantilever 530 and the third cantilever 550 are arranged on the same side of the induction bracket 500, and the strain sheet 700 is arranged on the other side of the induction bracket 500. In this way, the interference between the strain sheet 700 and the first cantilever 510, the second cantilever 530 and the third cantilever 550 is effectively avoided, thereby facilitating the arrangement of the strain sheet 700 on the induction bracket 500 to be connected to the main board 600 of the control assembly; and the induction bracket 500 adopts this structural form, the projections of the first cantilever 510, the second cantilever 530 and the third cantilever 550 in the axial direction overlap, the area of the induction bracket 500 in the cross section of the stylus occupies a small space, and the stylus can be made smaller in size.

[0125] One of the side wall of the second cantilever 530 and the end of the main shaft assembly 400 is provided with an arc-shaped protrusion 531, and the arc-shaped protrusion 531 abuts against the other one of the side wall of the second cantilever 530 and the end of the main shaft assembly 400. For example, the front side of the second cantilever 530 can be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531; for another example, the rear end of the main shaft assembly 400 can also be provided with the arc-shaped protrusion 531, and the end of the main shaft assembly 400 abuts against the second cantilever 530 through the arc-shaped protrusion 531. It can be understood that the second cantilever 530 and the main shaft assembly 400 abut against each other through the arc-shaped protrusion 531, so that when the main shaft assembly 400 acts on the second cantilever 530, the motion of the second cantilever 530 is not easily interfered, so as to ensure that the force transmitted by the main shaft assembly 400 can be better fed back to the elastic deformation of the deformation beam 520, and then the corresponding electric signal can be accurately obtained to input the main board 600 of the control assembly.

[0126] Based on the above embodiments one to three, the specific structure design of the main shaft assembly 400 and the main board 600 of the control assembly can include but is not limited to the following modes.

[0127] Referring to FIGS. 3, 7 and 12, the main board 600 is provided with a U-shaped accommodation gap 610 near one end of the induction support 500, and part of the structure of the induction support 500 is located in the accommodation gap 610, for example, the first cantilever 510 and part of the deformation beam 520 are located in the accommodation gap 610, so that the main board 600 and the induction support 500 are compactly assembled together, saving the space inside the pen barrel 100, and reserving enough space for the installation of other modules, such as batteries, signal electrodes, etc.

[0128] Referring to FIGS. 3, 7, 12 and 18, the main shaft assembly 400 includes a first shaft 410, a second shaft 420 and an elastic member 430, wherein the first shaft 410 is axially provided with a guide hole 411, the guide hole 411 only penetrates the rear end of the first shaft 410, and the second shaft 420 is slidably arranged on the first shaft 410 through the guide hole 411. The elastic member 430 is located in the guide hole 411, the front end of the elastic member 430 abuts against the bottom of the guide hole 411, that is, abuts against the first shaft 410, and the rear end of the elastic member 430 abuts against the front end of the second shaft 420; wherein the end of the first shaft 410 away from the second shaft 420 is connected with a connecting end, and the end of the second shaft 420 away from the first shaft 410 abuts against the second cantilever 530.

[0129] It can be understood that the elastic member 430 can be a spring with a large elastic coefficient, and the first shaft member 410 and the second shaft member 420 are elastically and slidingly connected by the elastic member 430. In this way, when the force of the pen head 300 on the screen is large, the elastic member 430 can be compressed, thereby preventing the pen head 300 from excessively pressing the screen. Since the elastic member 430 is a spring with a large elastic coefficient, the elastic member 430 will not be compressed when the user normally uses the stylus, thereby ensuring the use of the stylus.

[0130] Further, in order to facilitate the connection of the main shaft assembly 400 and the pen head 300, the main shaft assembly 400 further comprises a connecting head 440, the connecting end of the pen head 300 is threadedly connected with the front end of the connecting head 440, and the front end of the first shaft member 410 is snap-connected with the rear end of the connecting head 440. Alternatively, the connecting end of the pen head 300 is snap-connected with the front end of the connecting head 440, and the front end of the first shaft member 410 is threadedly connected with the rear end of the connecting head 440. It can be understood that, during the assembly of the main shaft assembly 400 and the pen head 300 to the first support 210, first, the connecting head 440 is connected with the pen head 300 or the main shaft assembly 400 in advance, and the pen head 300 is pre-installed on the first support 210. Then, the main shaft assembly 400 is connected with the pen head 300 through the connecting head 440, so as to assemble the main shaft assembly 400 to the first support 210. The connecting head 440, the first shaft member 410 and the pen head 300 are connected in different ways. In this way, the first shaft member 410 and the pen head 300 will not affect each other when connected with the connecting head 440, and the above assembly method can be conveniently implemented.

[0131] Referring to FIGS. 3, 7 and 12, the stylus further comprises a first electrode 800, which comprises a first spring member 810 and a first extension arm 820 connected with each other. The first spring member 810 is sleeved on the outside of the second shaft member 420, and the rear end of the first spring member 810 abuts against the first shaft member 410, so as to keep the second shaft member 420 and the second cantilever 530 abutting against each other. The first extension arm 820 is arranged on the first support 210 in the axial direction, and the first extension arm 820 is electrically connected with the main board 600. Thus, the first spring member 810 is electrically connected with the main board 600 through the first extension arm 820, and the first spring member 810 can be used as a signal electrode of the stylus.

[0132] Referring to FIG. 3, FIG. 7 and FIG. 12, the stylus further comprises a second electrode 900, the second electrode 900 comprising a second spring member 910 and a second extension arm 920 connected with each other, wherein the second spring member 910 is sleeved on the head of the pen head 300 and is conically arranged, the second spring member 910 is just adapted to the head shell of the pen head 300. The second extension arm 920 is arranged on the first support 210 along the axial direction, the second extension arm 920 is electrically connected with the main plate 600, thus the second spring member 910 is electrically connected with the main plate 600 through the second extension arm 920, and the second spring member 910 can be used as a signal electrode of the stylus.

[0133] Referring to FIG. 1 to FIG. 4, the embodiment of the present application further provides a strain gauge assembly, the strain gauge assembly is applied to the stylus, and the strain gauge assembly comprises the sensing support 500 and the strain gauge 700. The sensing support 500 comprises a deformation beam 520 and at least one cantilever connected with the deformation beam 520, the deformation beam 520 extends along a preset direction and is used for connecting with the pen holder 200 of the stylus, and the at least one cantilever is used for connecting with the main shaft assembly 400 of the stylus. The strain gauge 700 is arranged on the deformation beam 520, when the pen head 300 of the stylus moves relative to the pen barrel 100 of the stylus along the preset direction, the at least one cantilever is driven by the main shaft assembly 400 of the stylus to move, so that the deformation beam 520 and the strain gauge 700 are elastically deformed, and then the control assembly of the stylus detects the elastic deformation of the strain gauge 700 to obtain the writing force of the pen head 300 of the stylus relative to the screen. It can be understood that the specific structural features of the strain gauge assembly provided by the embodiment of the present application have been described in detail in the embodiments of the stylus of FIG. 1 to FIG. 18, which will not be repeated here.

[0134] The technical means disclosed in the present application is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. A stylus, characterized by The application relates to a stylus, comprising: a pen barrel; a pen holder arranged in the pen barrel; a pen head arranged in the pen holder and at least partially extending out of the pen barrel; a main shaft assembly arranged in the pen holder and connected with the pen head, the main shaft assembly being used for enabling the pen head to move relative to the pen barrel along a preset direction when the stylus is used to write on a screen; a strain gauge; a control assembly electrically connected with the strain gauge; and an induction support comprising a deformation beam and at least one cantilever connected with the deformation beam, the deformation beam extending along the preset direction and being connected with the pen holder, the at least one cantilever being connected with the main shaft assembly, the strain gauge being arranged on the deformation beam, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the strain gauge are elastically deformed, and then the control assembly detects the elastic deformation of the strain gauge to obtain the writing force of the pen head relative to the screen. The strain gauge comprises:

2. The stylus of claim 1, wherein an electrical connector comprising a strain segment and a connecting segment connected with each other, the strain segment being arranged on one side of the deformation beam, and the connecting segment being electrically connected with the control assembly; at least one resistor arranged on the strain segment, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the at least one resistor are elastically deformed. The at least one resistor comprises:

3. The stylus of claim 2, wherein two first bridge arm resistors, the two first bridge arm resistors being arranged on the strain segment along a first direction to form a half bridge on the electrical connector, when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the two first bridge arm resistors are elastically deformed.

4. The stylus according to claim 3, wherein: the deformation beam is arranged in a sheet shape; the two first bridge arm resistors are rectangular sheet shapes extending along a second direction, and the short edges of the two first bridge arm resistors are electrically connected with the strain segment; wherein the second direction is perpendicular to the first direction, and the second direction is the same as the preset direction. The at least one resistor further comprises:

5. The stylus of claim 3, wherein, two second bridge arm resistors, the two second bridge arm resistors being arranged on the strain segment along the second direction to form an electrical bridge with the two first bridge arm resistors on the electrical connector, and when the pen head moves relative to the pen barrel along the preset direction, the main shaft assembly drives the at least one cantilever to move, so that the deformation beam and the two second bridge arm resistors are elastically deformed; wherein the first direction intersects with the second direction.

6. The stylus according to claim 5, wherein: the two first bridge arm resistors are rectangular sheet shapes, and the short edges of the two first bridge arm resistors are electrically connected with the strain segment, the two second bridge arm resistors are rectangular sheet shapes, and the short edges of the two second bridge arm resistors are electrically connected with the strain segment, and the first direction is perpendicular to the second direction. ​ 7.The stylus of claim 6, wherein the first bridge resistor is a long rectangular sheet extending in the second direction, the second bridge resistor is a long rectangular sheet extending in the first direction, and the first direction is the same as the preset direction; or the first bridge resistor is a long rectangular sheet extending in the first direction, the second bridge resistor is a long rectangular sheet extending in the second direction, and the second direction is the same as the preset direction. 8.The stylus of any one of claims 1-7, wherein the at least one suspension arm comprises a second suspension arm connected to the shape-changing beam at an end close to the stylus tip, and the spindle assembly abuts against the second suspension arm, and when the stylus tip moves relative to the barrel in the preset direction, the spindle assembly drives the second suspension arm to move. 9.The stylus of claim 8, wherein the at least one suspension arm further comprises a first suspension arm connected to the shape-changing beam at an end away from the stylus tip, and the first suspension arm and the second suspension arm are located on the same side of the shape-changing beam; the pen holder comprises a holder body, a first boss and a second boss, and the stylus tip, the spindle assembly, the sensing bracket and the control assembly are sequentially arranged in the preset direction on the holder body, the first boss and the second boss are arranged at intervals on the holder body, and a positioning gap for the first suspension arm to be clamped into is formed between the first boss and the second boss. 10.The stylus of claim 3, wherein the electrical connector further comprises a static segment between the strain segment and the connecting segment, the static segment is connected to the strain segment and the connecting segment, and the static segment is arranged separately from the shape-changing beam; the at least one resistor further comprises two second bridge resistors, and the two second bridge resistors are arranged at intervals on the static segment in the first direction to form an electrical bridge with the two first bridge resistors on the electrical connector, and the two second bridge resistors do not produce elastic deformation when the shape-changing beam and the two first bridge resistors produce elastic deformation. 11.The stylus of claim 10, wherein the at least one suspension arm comprises a second suspension arm connected to the shape-changing beam at an end close to the stylus tip, and the spindle assembly abuts against the second suspension arm, and when the stylus tip moves relative to the barrel in the preset direction, the spindle assembly drives the second suspension arm to move, so that the shape-changing beam and the two first bridge resistors produce elastic deformation. 12.The stylus of claim 11, wherein the at least one suspension arm further comprises a first suspension arm connected to the shape-changing beam at an end away from the stylus tip. ​ ​ ​ ​ ​ ​ ​ ​ ​ The sensing support further comprises a static beam, the static beam and the deformation beam are arranged on one side of the pen holder along the preset direction, one end of the first cantilever close to the pen head is connected with the static beam, and the first cantilever is connected with the pen holder, the first cantilever and the second cantilever are located on the same side of the deformation beam and the static beam, and the static section is arranged on the static beam. 13.The stylus of claim 12, wherein, The first bridge arm resistor is a rectangular sheet extending along a second direction, and the short edges at both ends of the first bridge arm resistor are electrically connected with the strain section, and the second bridge arm resistor is a rectangular sheet extending along the second direction, and the short edges at both ends of the second bridge arm resistor are electrically connected with the static section; wherein the second direction is perpendicular to the first direction, and the second direction is the same as the preset direction. 14.The stylus of claim 12, wherein, The first cantilever comprises a first fixed sheet, a second fixed sheet and a bending part, the first fixed sheet and the second fixed sheet are located on the same side of the deformation beam and the static beam, one end of the first fixed sheet away from the deformation beam is connected with the deformation beam, one end of the second fixed sheet close to the pen head is connected with the static beam, one end of the bending part is connected with one end of the first fixed sheet away from the deformation beam, the other end of the bending part is connected with one end of the second fixed sheet away from the static beam, and a deformation gap is formed between the first fixed sheet and the second fixed sheet. 15.The stylus of claim 12, wherein, The pen holder comprises a holder body, a first boss and a second boss, the pen head, the main shaft assembly, the sensing support and the control assembly are sequentially arranged on the holder body along the preset direction, the first boss and the second boss are arranged on the holder body in a spaced manner, and a positioning gap for the first cantilever to be clamped is formed between the first boss and the second boss. 16.The stylus of claim 15, wherein, The first boss is closer to the pen head than the second boss; The sensing support further comprises a third cantilever, one end of the third cantilever away from the pen head is connected with the static beam, and a fixing gap for the second boss to be clamped is formed between the third cantilever and the first cantilever. 17.The stylus of claim 11, wherein, One of the side wall of the second cantilever and the end of the main shaft assembly is provided with an arc-shaped protrusion, and the arc-shaped protrusion abuts against the other of the side wall of the second cantilever and the end of the main shaft assembly.

18. The stylus of claim 2, wherein, The electrical connector is an FPC, and the strain section and the connecting section form an integral FPC structure.

19. The stylus of claim 18, wherein, The at least one resistor is a printed resistor formed on the FPC of the strain section or a sheet-shaped resistor wire arranged on the FPC of the strain section.

20. A strain gauge assembly, characterized by The strain gauge assembly is applied to a stylus, and the strain gauge assembly comprises: The induction support includes a deformation beam and at least one cantilever connected to the deformation beam, the deformation beam extends along a preset direction and is used to connect with a pen holder of the stylus, and the at least one cantilever is used to connect a main shaft assembly of the stylus. Strain gauges are arranged on the deformation beam, when a pen head of the stylus moves along the preset direction relative to a pen barrel of the stylus, the at least one cantilever moves under the drive of the main shaft assembly of the stylus, so that the deformation beam and the strain gauges generate elastic deformation, and then a control assembly of the stylus detects the elastic deformation of the strain gauges to obtain the writing force of the pen head of the stylus relative to a screen.

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