Electromagnetic handwriting pen and handwriting system

Abstract

The utility model provides an electromagnetic handwriting pen and a handwriting system. The electromagnetic handwriting pen comprises a pen core, an ejector rod and a pressure sensor which are sequentially arranged, the device further comprises an elastic piece, the elastic piece is arranged between the ejector rod and the pressure sensor, and the ejector rod is in transmission connection with the elastic piece in a non-prepressing mode. The electromagnetic handwriting pen is switched between a first state and a second state; in the first state, the writing pressure of the refill is transmitted to the pressure sensor through the ejector rod and the elastic piece in sequence. And in the second state, the ejector rod is not subjected to pre-compression towards the elastic piece. Due to the fact that a pre-pressing spring is omitted, even if the elastic piece is aged along with use, the ejector rod cannot be subjected to pre-pressing force deviating from the elastic piece. And the pressure detected by the pressure sensor in a non-working state is only reduced along with the aging of the elastic piece and is not increased. Therefore, the problem of ink leakage caused by the use of the electromagnetic handwriting pen in the prior art is solved, and the service life of the electromagnetic handwriting pen is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent accessories, and particularly relates to an electromagnetic stylus and a handwriting system.

Background Art

[0002] With the improvement of the scientific and technological level, various intelligent terminal devices have become common tools in people's lives. The common interaction method of these terminal devices is touch operation. The electromagnetic stylus and the handwriting tablet have become common input devices to facilitate users to perform input operations such as writing or drawing.

[0003] In order to make the use feeling of the electromagnetic stylus closer to that of a real pen, a pressure sensor is often provided in the electromagnetic stylus to detect the pressure applied to the pen tip by the user during writing, so as to display the thickness change of the handwriting on the terminal device according to the magnitude of the user's writing pressure, and simulate the feeling of the pen tip during the real pen writing process.

[0004] In the prior art, the electromagnetic stylus includes a pen core, a preloading spring, a push rod, a silica gel pad and a pressure sensor; during the user's writing process, the writing pressure of the pen core is transmitted to the silica gel pad through the push rod, and then transmitted to the pressure sensor by the silica gel pad. At the same time, the preloading spring is arranged on the side of the push rod facing the pen core to press the push rod against the silica gel pad to fill the space gap between the push rod and the silica gel pad and prevent the pen core from shaking.

[0005] In the above prior art, the preloading spring applies a pre-pressure to the pressure sensor, and the elasticity of the silica gel pad itself provides a resistance. The pre-pressure and the resistance form a resultant force on the pressure sensor. In the factory state, the manufacturer zeros the resultant force. Thus, when the user does not use the electromagnetic stylus, the pressure sensor does not detect pressure, and the handwriting of the electromagnetic stylus is not displayed on the terminal device.

[0006] However, during the use of the electromagnetic stylus, the silica gel pad needs to frequently bear and conduct the writing pressure of the pen core, and can bear a pressure of about five hundred grams at most; while the preloading spring only needs to continuously provide a pre-pressure of about three to four grams. Considering the characteristic that the silica gel material itself is more prone to fatigue and aging compared with the metal spring, the elasticity of the silica gel pad is more likely to decrease. At this time, the resistance applied by the silica gel pad to the preloading spring decreases. The resultant force balance between the silica gel pad and the preloading spring shifts, resulting in the pre-pressure detected by the pressure sensor being greater than the zero-adjusted value at the factory when the user is not writing. The pressure sensor misjudges the pre-pressure as the writing pressure, so that when the user is not in a writing state, the electromagnetic stylus still inputs writing handwriting to the terminal device.

[0007] Therefore, the above solution of the prior art will cause misrecognition of the electromagnetic stylus due to aging during use, so that the electromagnetic stylus will input handwriting to the terminal device even when not in use, which is commonly known as the "ink leakage" phenomenon.

Summary of the Utility Model

[0008] The utility model provides an electromagnetic stylus. Through the non-preloaded transmission connection between the ejector rod and the elastic member, the problem of "ink leakage" caused by the pressure sensor misidentifying the pre-pressure as the writing pressure as the elastic member ages is solved.

[0009] In a first aspect of the utility model, an electromagnetic stylus is provided, which includes a pen tip, an ejector rod, and a pressure sensor arranged in sequence; an elastic member is further included, wherein the elastic member is arranged between the ejector rod and the pressure sensor, and the ejector rod is in transmission connection with the elastic member in a non-preloaded manner; the electromagnetic stylus switches between a first state and a second state, wherein the first state is the state when the electromagnetic stylus is writing, and the second state is the state when the electromagnetic stylus is not writing; in the first state, the writing pressure of the pen tip is sequentially transmitted to the pressure sensor through the ejector rod and the elastic member; in the second state, the ejector rod is not subjected to the pre-pressure towards the elastic member.

[0010] In a second aspect of the utility model, a handwriting system is provided, which includes a handwriting board and the electromagnetic stylus of the first aspect. The electromagnetic stylus is used for writing on the handwriting board to input a writing signal into the terminal device.

[0011] The electromagnetic stylus provided by the utility model includes a pen tip, an ejector rod, and a pressure sensor arranged in sequence; an elastic member is further included, wherein the elastic member is arranged between the ejector rod and the pressure sensor, and the ejector rod is in transmission connection with the elastic member in a non-preloaded manner; the electromagnetic stylus switches between a first state and a second state; in the first state, the writing pressure of the pen tip is sequentially transmitted to the pressure sensor through the ejector rod and the elastic member; in the second state, the ejector rod is not subjected to the pre-pressure towards the elastic member. Since the pre-pressure spring is cancelled, even if the elastic member ages during use, the ejector rod will not be subjected to the pre-pressure towards the elastic member. The pressure detected by the pressure sensor in the non-working state will only decrease with the aging of the elastic member and will not increase. Thus, the "ink leakage" phenomenon of the electromagnetic stylus in the prior art during use is solved, and the service life of the electromagnetic stylus is prolonged.

Description of the Drawings

[0012] Figure 1 is an exploded view of the electromagnetic stylus provided by the utility model;

[0013] Figure 2 is Figure 1 a partial enlarged view of part A in

[0014] Figure 3 is a partial assembled exploded view of the electromagnetic stylus provided by the utility model;

[0015] Figure 4 is Figure 3 a schematic diagram after assembling the assembled exploded view in

[0016] Figure 5 An exploded view of the cooperation relationship among the elastic member, the pressure sensor, the seat chamber and the circuit board in the electromagnetic stylus provided by the present utility model;

[0017] Figure 6 A schematic diagram of the ejector rod in the electromagnetic stylus provided by the present utility model;

[0018] Figure 7 A sectional view of the electromagnetic stylus provided by the present utility model;

[0019] Figure 8 is Figure 7 A partial enlarged view of part B in

[0020] Figure 9 A schematic diagram of the cooperation between the elastic member and the pressure sensor of the electromagnetic stylus provided by the present utility model.

Specific Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0022] Please refer to FIGS. 1 to Figure 2 , and Figures 7 to 8 . The present application provides an electromagnetic stylus, which includes a housing 100, and a pen core 200, an ejector rod 400 and a pressure sensor 600 sequentially arranged in the housing 100; it further includes an elastic member 500, wherein the elastic member 500 is arranged between the ejector rod 400 and the pressure sensor 600, and the ejector rod 400 is in transmission connection with the elastic member 500 in a non-preloaded manner; the electromagnetic stylus switches between a first state and a second state; the first state is the state when the electromagnetic stylus is writing, and the second state is the state when the electromagnetic stylus is not writing; in the first state, the writing pressure of the pen core 200 is sequentially transmitted to the pressure sensor 600 through the ejector rod 400 and the elastic member 500; in the second state, the ejector rod 400 is not subjected to a pre-pressure towards the elastic member 500.

[0023] In this embodiment, the refill 200, the ejector rod 400, the elastic member 500, and the pressure sensor 600 are arranged in sequence. Preferably, the elastic member 500 can be set as a silica gel pad. In the first state, the writing pressure can be transmitted from the refill 200 to the pressure sensor 600 through the ejector rod 400 and the silica gel pad in sequence, so as to detect the writing pressure of the user. Thus, the ejector rod 400 and the elastic member 500 are in transmission connection during the working process. In the second state, since the preloading spring is cancelled, even if the elastic member 500 ages during use, the ejector rod 400 will not be subjected to the preloading force biased towards the elastic member 500. Therefore, after the pressure sensor 600 is zeroed in the factory state, the pressure detected by the pressure sensor 600 in the non-working state will only decrease as the elastic member 500 ages and will not increase. This solves the "ink leakage" phenomenon of the electromagnetic stylus in the prior art during use, and greatly extends the service life of the electromagnetic stylus.

[0024] Optionally, since the preloading spring is cancelled and the gap between the ejector rod 400 and the elastic member 500 cannot be filled by the preloading force, the present utility model adopts the following methods to make up for it.

[0025] (1) The ejector rod 400 abuts against the elastic member 500. At this time, there is no space gap between the ejector rod 400 and the elastic member 500.

[0026] (2) The gap range between the ejector rod 400 and the elastic member 500 is less than the preset value. At this time, by improving the processing precision of the ejector rod 400, the gap between the ejector rod 400 and the elastic member 500 is controlled within the preset value, and the user will not perceive the slight shaking caused by the tiny space gap.

[0027] (3) The range in which the ejector rod 400 is inserted into the elastic member 500 is less than the preset value. At this time, by appropriately extending the ejector rod 400, the ejector rod 400 is appropriately inserted into the elastic member 500 to fill the space gap between the ejector rod 400 and the elastic member 500. Due to the pressure input by slightly inserting the ejector rod 400 into the elastic member 500, the pressure sensor 600 can be zeroed in the factory state.

[0028] For the above three methods, due to the deviation of the processing precision, they may all occur, but as long as the processing precision is controlled within the above preset value, the shaking feeling brought by the space gap to the refill 200 can be compensated.

[0029] Meanwhile, since the preloading spring is cancelled, the raw material cost of the electromagnetic stylus provided by the present utility model is reduced, and the assembly process is more simplified.

[0030] It should be noted that in the existing technical solution, due to the provision of a preloading spring, the preloading force provided by the preloading spring presses the elastic member 500 against the pressure sensor 600, playing a fixing role. In the present utility model, since the preloading spring is cancelled, the following method is adopted to fix the elastic member 500.

[0031] Please refer to Figure 2 , the end of the circuit board 700 is embedded in the seat compartment 800, the circuit board 700 and the seat compartment 800 enclose a first installation space 900, the pressure sensor 600 and the elastic member 500 are arranged in the first installation space 900, wherein; the pressure sensor 600 is fixedly connected to the circuit board 700, and the pressure sensor 600 presses and fixes the elastic member 500 in the seat compartment 800.

[0032] In this embodiment, the end of the circuit board 700 is embedded in the seat compartment 800, so as to realize the fixed connection of the circuit board 700. In this case, the circuit board 700 and the seat compartment 800 enclose a first installation space 900 for installing the pressure sensor 600 and the elastic member 500. Thus, while realizing the connection between the circuit board 700 and the seat compartment 800, by using the installation of the circuit board 700 and the seat compartment 800, the elastic member 500 is fixed between the seat compartment 800 and the pressure sensor 600. It not only realizes the installation of the elastic member 500, but also ensures the contact between the elastic member 500 and the pressure sensor 600, overcoming the situation that the elastic member 500 is loose relative to the pressure sensor 600 due to the cancellation of the preloading spring.

[0033] Optionally, there are various connection methods between the circuit board 700 and the seat compartment 800. The following provides a preferred embodiment.

[0034] As Figures 3 to 5 shown, an installation groove 710 is provided at the end of the circuit board 700, and the installation groove 710 extends along the length direction of the circuit board 700; a clamping block 810 is provided at one end of the seat compartment 800 close to the circuit board 700. The clamping block 810 includes a first sub-block 811 and a second sub-block 812, and the first sub-block 811 and the second sub-block 812 are arranged in an interleaved manner to form a hook-shaped structure for clamping the circuit board 700. When the circuit board 700 is inserted into the seat compartment 800, the first sub-block 811 is embedded in the installation groove 710, and the second sub-block 812 presses on the circuit board 700.

[0035] Optionally, after the circuit board 700 is inserted into the seat compartment 800, to ensure the stability of the relative arrangement of the circuit board 700 and the seat compartment 800, a first convex claw 820 is provided on the seat compartment 800. When the first sub-block 811 is embedded in the installation groove 710, the first convex claw 820 fixes the end of the circuit board 700.

[0036] In this embodiment, preferably, there are two first convex claws 820, which respectively correspond to parts on both sides of the installation groove 710 of the circuit board 700, so as to further fix the circuit board 700 after it is engaged with the seat compartment 800. The above-mentioned clamping block 810 fixes one end of the circuit board 700, and the first convex claw 820 fixes the other end of the circuit board 700. The two cooperate to achieve stable fixation of the circuit board 700.

[0037] As a preferred implementation, as Figure 9 shown, the pressure sensor 600 includes a circuit sub-board 610 and a sensor unit 620. Among them, the circuit sub-board 610 has a T-shaped structure, including a cross arm and a longitudinal arm, and the sensor unit 620 is arranged on the cross arm; when the circuit board 700 is inserted into the seat compartment 800, the longitudinal arm of the circuit sub-board 610 is inserted into the installation groove 710, and the cross arm of the circuit sub-board 610 presses on the upper surface of the circuit board 700 and is electrically connected to the circuit board 700.

[0038] In this embodiment, the cross arm of the circuit sub-board 610 is wider, so that there is a larger area available for fixing the sensor unit 620 for sensing the writing pressure. The longitudinal arm of the circuit sub-board 610 is inserted into the installation groove 710. In this way, the circuit sub-board 610 is vertically connected to the circuit board 700.

[0039] To fix the circuit sub-board 610, a jack 850 is provided on the seat compartment 800. After the longitudinal arm of the circuit sub-board 610 passes through the installation groove 710, it is inserted into the jack 850.

[0040] In this embodiment, since the circuit sub-board 610 itself is fixed to the circuit board 700, and the circuit sub-board 610 is further fixed to the seat compartment 800 through the jack 850, not only the installation stability of the circuit sub-board 610 is improved, but also the connection stability between the circuit board 700 and the seat compartment 800 is strengthened.

[0041] Further, in order to stably connect the circuit sub-board 610 to the circuit board 700, the installation groove 710 on the circuit board 700 is T-shaped, including a longitudinal groove and a transverse groove. The longitudinal groove is inserted into the first sub-block 811, and the transverse groove is used to accommodate the lower end of the cross arm after the circuit sub-board 610 is inserted.

[0042] In this embodiment, the longitudinal groove of the mounting groove 710 is used to connect with the seat compartment 800, and the transverse groove is used to accommodate the lower end of the circuit board 610. In this way, the connection between the circuit board 610 and the circuit board 700 is firm. Preferably, the electrical connection between the circuit board 610 and the circuit board 700 is made by soldering, so as to transmit the pressure signal obtained by the sensing unit to the circuit board 700. At the same time, soldering can improve the connection stability between the circuit board 610 and the circuit board 700.

[0043] In summary, the preferred installation process among the circuit board 700, the seat compartment 800, the elastic member 500, and the pressure sensor 600 is as follows:

[0044] (1) As Figure 9 shown, solder the sensor unit 620 to the circuit board 610;

[0045] (2) As Figure 9 shown, cover the elastic member 500 (i.e., the silicone pad) on the sensor unit 620;

[0046] (3) As Figures 3 to 4 shown, insert the circuit board 700 into the seat compartment 800. During this process, the first sub-block 811 on the seat compartment 800 is embedded in the mounting groove 710 on the circuit board 700, and the second sub-block 812 is pressed on the circuit board 700; the first claw 820 at the other end of the seat compartment 800 fixes the end of the circuit board 700.

[0047] (4) As Figure 5 shown, insert the circuit board 610 into the mounting groove 710 until the longitudinal arm of the circuit board 610 is firmly inserted into the jack 850 of the seat compartment 800.

[0048] (5) Connect the circuit board 610 and the circuit board 700 by soldering.

[0049] In this way, through the above steps, the firm connection between the seat compartment 800 and the circuit board 700 is realized, preventing the two from loosening during use. At the same time, for the firm connection between the seat compartment 800 and the circuit board 700, the first installation space 900 formed by the seat compartment 800 and the circuit board 700 can stably accommodate the elastic member 500 and prevent it from shifting.

[0050] Furthermore, the ejector rod is arranged inside the seat compartment 800. When the refill 200 bears the writing pressure, the ejector rod 400 slides inside the seat compartment 800 to transmit the writing pressure of the refill 200. Preferably, the connection method between the seat compartment 800 and the ejector rod 400 is as follows.

[0051] As Figure 3 、 4As shown in FIGS. 6, a first through hole 830 is provided on the seat chamber 800, and the ejector rod 400 passes through the first through hole 830 and is in driving connection with the elastic member 500; a limiting block 410 is provided on the side wall of the ejector rod 400, and a limiting hole 840 adapted to the limiting block 410 is provided on the seat chamber 800. The side wall of the limiting block 410 facing the elastic member 500 is provided as an inclined surface 411.

[0052] In this embodiment, the ejector rod 400 penetrates into the first through hole 830 and thus slides in the first through hole 830. The seat chamber 800 not only fixes the ejector rod 400 but also guides the ejector rod 400 to move along the axial direction of the pen. Further, in order to prevent the ejector rod 400 from sliding out of the first through hole 830, the limiting block 410 and the limiting hole 840 are provided. Among them, the side wall of the limiting block 410 facing the elastic member 500 is provided as an inclined surface 411. Thus, during the installation process, when the ejector rod 400 is inserted into the first through hole 830, the limiting block 410 can be induced to deform through the induction of the inclined surface 411, ensuring that the ejector rod 400 is smoothly inserted into the first through hole 830 of the seat chamber 800. When the limiting block 410 has been inserted into the limiting hole 840, since the back surface of the limiting block 410 is not an inclined surface 411, the limiting block 410 cannot exit along the original path, thereby playing a role in preventing the ejector rod 400 from exiting the seat chamber 800.

[0053] As Figure 2 shown, further, the electromagnetic stylus provided by the present utility model further includes a magnetic induction assembly 300. The pen core 200 passes through the magnetic induction assembly 300 and is connected to the first end of the ejector rod 400. The magnetic induction assembly 300 is used to generate a magnetic induction signal, and the magnetic induction signal is used for the pen core 200 to realize touch input. The magnetic induction assembly 300 is connected to the seat chamber 800 through a soft rubber sleeve 10. A second through hole 11 is provided on the rubber sleeve 10. One end of the magnetic induction assembly 300 is inserted into one side of the second through hole 11, and one end of the seat chamber 800 is inserted into the other side of the rubber sleeve 10.

[0054] Optionally, the pen core 200 passes through the magnetic induction assembly 300, and the magnetic induction assembly 300 is connected to the seat chamber 800. Thus, the magnetic induction assembly 300 generates a magnetic control signal for realizing touch input through the pen core 200. Optionally, the magnetic induction assembly 300 includes a coil 310 and a magnetic sleeve 320. Among them, the coil 310 is wound around the periphery of the magnetic sleeve 320, the coil 310 is connected to the circuit board 700, and the pen core 200 passes through the magnetic sleeve 320 and is then connected to the ejector rod 400.

[0055] In this embodiment, since the rubber sleeve 10 is made of soft material, a soft connection between the magnetic induction component 300 and the seat chamber 800 is achieved. Even if there is an offset between the magnetic induction component 300 and the seat chamber 800 during the installation process, resulting in non-coaxial installation, due to the soft connection between the two, after the outer shell 100 of the electromagnetic stylus is inserted, it will return to coaxial under the pressure of the outer shell 100 without generating additional pressure. Otherwise, if the rubber sleeve 10 is made of hard material as in the prior art, once there is an offset between the magnetic induction component 300 and the seat chamber 800, causing them to be non-coaxial. During the installation process, when it is straightened to the coaxial state under the pressure of the outer shell 100, the hard rubber sleeve 10 may deform and press the pen core 200 or the ejector rod 400, generating pressure towards the pressure sensor 600, resulting in misidentification by the pressure sensor 600 and causing the "ink leakage" phenomenon. The present utility model sets the rubber sleeve 10 as soft, thus solving this problem.

[0056] The present utility model also provides a handwriting system, including a handwriting tablet and the electromagnetic stylus as described above. The electromagnetic stylus is used to write on the handwriting tablet to input a writing signal into a terminal device.

[0057] In summary, the electromagnetic stylus provided by the present utility model includes a pen core, an ejector rod, and a pressure sensor arranged in sequence; it also includes an elastic member. The elastic member is arranged between the ejector rod and the pressure sensor, and the ejector rod is in transmission connection with the elastic member in a non-preloading manner; the electromagnetic stylus switches between a first state and a second state; in the first state, the writing pressure of the pen core is transmitted to the pressure sensor through the ejector rod and the elastic member in sequence; in the second state, the ejector rod is not under the pre-pressure towards the elastic member. Since the preloading spring is cancelled, even if the elastic member ages during use, the ejector rod will not be under the pre-pressure towards the elastic member. The pressure detected by the pressure sensor in the non-working state will only decrease with the aging of the elastic member and will not increase. Thus, the "ink leakage" phenomenon caused by the use of the electromagnetic stylus in the prior art is solved, and the service life of the electromagnetic stylus is extended.

[0058] The above-described embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An electromagnetic stylus, comprising a pen tip, a push rod, and a pressure sensor arranged in sequence; characterized in that, It further includes an elastic member, wherein, the elastic member is disposed between the ejector rod and the pressure sensor, and the ejector rod is drivingly connected to the elastic member in a non-preloaded manner; the electromagnetic stylus switches between a first state and a second state, wherein the first state is the state when the electromagnetic stylus is writing, and the second state is the state when the electromagnetic stylus is not writing; in the first state, the writing pressure of the pen tip is sequentially transmitted to the pressure sensor through the ejector rod and the elastic member; in the second state, the ejector rod is not subjected to a pre-pressure towards the elastic member.

2. The electromagnetic stylus according to claim 1, wherein It further includes a seat bin and a circuit board. The end of the circuit board is embedded in the seat bin. The circuit board and the seat bin enclose a first installation space. The pressure sensor and the elastic member are disposed in the first installation space, wherein; the pressure sensor is fixedly connected to the circuit board, and the pressure sensor fixes the elastic member in the first installation space.

3. The electromagnetic stylus according to claim 2, wherein, The end of the circuit board is provided with an installation groove, and the installation groove extends along the length direction of the circuit board; One end of the seat bin close to the circuit board includes a clamping block, and the clamping block includes a first sub-block and a second sub-block. The first sub-block and the second sub-block are arranged alternately to form a hook-shaped structure for clamping the circuit board; when the circuit board is inserted into the seat bin, the first sub-block is embedded in the installation groove, and the second sub-block is pressed on the circuit board.

4. The electromagnetic stylus according to claim 3, wherein, The seat bin is provided with a first convex claw. When the first sub-block is embedded in the installation groove, the first convex claw fixes the end of the circuit board.

5. The electromagnetic stylus according to claim 3, characterized in that, The pressure sensor includes a circuit sub-board and a sensor unit, wherein, the circuit sub-board is in a T-shaped structure and includes a cross arm and a longitudinal arm. The sensor unit is disposed on the cross arm; after the circuit board is inserted into the seat bin, the longitudinal arm of the circuit sub-board is inserted into the installation groove, and the cross arm of the circuit sub-board is pressed on the upper surface of the circuit board and electrically connected to the circuit board.

6. The electromagnetic stylus according to claim 5, wherein, The seat bin is provided with a jack, and the longitudinal arm of the circuit sub-board is inserted into the jack after passing through the installation groove.

7. The electromagnetic stylus according to claim 5, characterized in that, The installation groove is in a T shape and includes a longitudinal groove and a transverse groove. The longitudinal groove is inserted with the first sub-block, and the transverse groove is used to accommodate the lower end of the cross arm after the circuit sub-board is inserted.

8. The electromagnetic stylus according to claim 2, wherein, The seat bin is provided with a first through hole, and the ejector rod passes through the first through hole and is drivingly connected to the elastic member; a limiting block is included on the side wall of the ejector rod, a limiting hole adapted to the limiting block is opened on the seat bin, and the side wall of the limiting block facing the elastic member is an inclined surface.

9. The electromagnetic stylus according to claim 2, wherein It further includes a magnetic induction component, the pen tip passes through the magnetic induction component and is connected to the ejector rod. The magnetic induction component is used to generate a magnetic induction signal, and the magnetic induction signal is used for the pen tip to realize touch input; the magnetic induction component is connected to the seat bin through a soft rubber sleeve. The rubber sleeve is provided with a second through hole. One end of the magnetic induction component is inserted into one side of the second through hole, and one end of the seat bin is inserted into the other side of the rubber sleeve.

10. A handwriting system, comprising a handwriting tablet, and an electromagnetic handwriting pen as described in any one of claims 1 to 9, wherein the electromagnetic handwriting pen is used for writing on the handwriting tablet to input a writing signal into a terminal device.

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