Writing control method, electronic blackboard, intelligent pen and intelligent writing system

Abstract

The invention provides a writing control method, an electronic blackboard, an intelligent pen and an intelligent writing system.A first induction coil used for generating a magnetic field is laid on a screen of the electronic blackboard, and a magnet is arranged in a pen point of the intelligent pen; the intelligent pen controls the magnet to radiate a magnetic field through the pen point of the intelligent pen, and triggers the electronic blackboard to supply power to the first induction coil used for generating the magnetic field, so that the intelligent pen suspends above the electronic blackboard, and the pen point of the intelligent pen does not make contact with the surface of the electronic blackboard; the polarity of a magnetic field generated by the first induction coil is the same as that of a magnetic field radiated by the magnet through the pen point of the intelligent pen, so that the pen point of the intelligent pen can suspend above the surface of the electronic blackboard, the pen point does not make direct contact with the electronic blackboard, and friction noise between the pen point and the electronic blackboard is reduced.

Description

Technical Field

[0001] This application relates to the field of smart pens, and more particularly to a writing control method, an electronic blackboard, a smart pen, and a smart writing system. Background Technology

[0002] With the continuous enrichment of digital teaching scenarios, smart capacitive pens with wireless amplification functions have become a key electronic writing tool and have been widely used in the education field.

[0003] However, in actual use, traditional smart capacitive pens with amplification functions are prone to generating friction noise during writing because the pen tip is in direct contact with the surface of the electronic blackboard. This noise is picked up by the smart pen's microphone and amplified by the amplification system, thus affecting the auditory experience of the user and those around them. Summary of the Invention

[0004] Based on the aforementioned technological status, this application provides a writing control method, an electronic blackboard, a smart pen, and an intelligent writing system to reduce friction noise between the tip of the smart pen and the electronic blackboard.

[0005] To achieve the above-mentioned technical objectives, this application proposes the following technical solution:

[0006] According to a first aspect of the embodiments of this application, a writing control method is provided, applied to an electronic blackboard, wherein the screen of the electronic blackboard is covered with a first induction coil for generating a magnetic field; the method includes: when a smart pen is sensed writing on the electronic blackboard, supplying power to the first induction coil so that the smart pen suspends above the electronic blackboard, and the tip of the smart pen does not contact the surface of the electronic blackboard; wherein a magnet is disposed inside the tip of the smart pen, and the polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the tip of the smart pen.

[0007] In some implementations, the screen of the electronic blackboard is further equipped with a second induction coil for detecting radio frequency signals, and the smart pen is internally equipped with a radio frequency circuit for transmitting radio frequency signals; the method further includes: detecting the radio frequency signals emitted by the smart pen through the second induction coil; when the second induction coil detects the radio frequency signals emitted by the smart pen, confirming that the smart pen is writing on the electronic blackboard.

[0008] In some implementations, the method further includes: the electronic blackboard sending the signal strength of the radio frequency signal detected by the second induction coil to the smart pen, so that the smart pen adjusts the magnetic field strength of the magnet according to the signal strength of the radio frequency signal, thereby controlling the smart pen to levitate above the electronic blackboard.

[0009] In some implementations, the method further includes: the electronic blackboard adjusting the strength of the magnetic field generated by the first induction coil based on the signal strength of the radio frequency signal detected by the second induction coil, so as to control the smart pen to float above the electronic blackboard.

[0010] According to a second aspect of the embodiments of this application, a writing control method is provided, applied to a smart pen, wherein a magnet is disposed within the tip of the smart pen. The method includes: when the smart pen writes on an electronic blackboard, the smart pen controls the magnet to radiate a magnetic field through the tip of the smart pen, and triggers the electronic blackboard to supply power to a first induction coil for generating a magnetic field, so that the smart pen suspends above the electronic blackboard, and the tip of the smart pen does not contact the surface of the electronic blackboard; wherein the first induction coil is disposed on the screen of the electronic blackboard, and the polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the tip of the smart pen.

[0011] In some implementations, the smart pen is equipped with an internal radio frequency circuit for transmitting radio frequency signals, and the screen of the electronic blackboard is also covered with a second induction coil for detecting radio frequency signals; the method further includes: when the smart pen writes on the electronic blackboard, controlling the radio frequency circuit to transmit radio frequency signals, so that when the second induction coil detects the radio frequency signals, the electronic blackboard supplies power to the first induction coil.

[0012] In some implementations, the method further includes: receiving the signal strength of the radio frequency signal transmitted by the electronic blackboard; obtaining the signal strength of the radio frequency signal through the second induction coil; and adjusting the magnetic field strength of the magnet based on the signal strength of the radio frequency signal to control the smart pen to levitate above the electronic blackboard.

[0013] In some implementations, adjusting the magnetic field strength of the magnet based on the signal strength of the radio frequency signal to control the smart pen to levitate above the electronic blackboard includes: adjusting the magnitude of the current in the magnet based on a comparison between the signal strength of the radio frequency signal and a preset signal strength range to control the smart pen to levitate above the electronic blackboard.

[0014] In some implementations, the maximum value of the preset signal strength range is a first preset signal strength, and the minimum value of the preset signal strength range is a second preset signal strength; the smart pen is also equipped with an induced current sensor, used to output a corresponding induced current value based on the change in distance between the magnet and the induced current sensor; adjusting the magnitude of the current in the magnet according to the comparison result between the signal strength of the radio frequency signal and the preset signal strength range to control the smart pen to levitate above the electronic blackboard includes: when it is determined that the signal strength of the radio frequency signal is greater than the first preset signal strength, and the difference between the two is greater than or equal to a preset difference, controlling the... The current in the magnet increases to control the tip of the smart pen to move away from the electronic blackboard until the induced current value increases to a preset induced current value range; or, when it is determined that the signal strength of the radio frequency signal is less than the second preset signal strength, and the difference between the two is greater than or equal to a preset difference, the current in the magnet decreases to control the tip of the smart pen to move closer to the electronic blackboard until the induced current value decreases to a preset induced current value range; wherein, when the induced current value output by the induced current sensor is within the preset induced current value range, the tip of the smart pen does not contact the surface of the electronic blackboard, and is able to generate a writing trajectory on the electronic blackboard.

[0015] According to a third aspect of the embodiments of this application, an electronic blackboard is provided, comprising: a first induction coil disposed on a screen of the electronic blackboard for generating a magnetic field; the electronic blackboard is configured to implement the writing control method as described in the first aspect.

[0016] According to a fourth aspect of the embodiments of this application, a smart pen is provided, wherein a magnet is disposed within the tip of the smart pen, and the smart pen is configured to implement the writing control method as described in the second aspect.

[0017] According to a fifth aspect of the embodiments of this application, an intelligent writing system is provided, including an electronic blackboard and an intelligent pen; wherein, the screen of the electronic blackboard is provided with a first induction coil for generating a magnetic field, and the tip of the intelligent pen is provided with a magnet; the electronic blackboard is configured to implement the writing control method described in the first aspect; and / or, the intelligent pen is configured to implement the writing control method described in the second aspect.

[0018] This application provides a writing control method, electronic blackboard, smart pen, and smart writing system. The method involves an electronic blackboard screen with a first induction coil for generating a magnetic field, and a smart pen tip containing a magnet. When the smart pen writes on the electronic blackboard, it controls the magnet to radiate a magnetic field through the pen tip, triggering the electronic blackboard to supply power to the first induction coil. This causes the smart pen to levitate above the blackboard without the pen tip touching its surface. The polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the pen tip. Therefore, a repulsive force is generated between the pen tip and the blackboard, allowing the pen tip to levitate above the blackboard surface. This avoids direct contact between the pen tip and the blackboard, preventing friction noise and amplifying friction noise when using both writing and amplification functions simultaneously, thus preventing an impact on the auditory experience. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A flowchart illustrating a writing control method provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a smart pen tip provided in an embodiment of this application;

[0022] Figure 3 A flowchart illustrating a writing control method provided in an embodiment of this application;

[0023] Figure 4 A flowchart illustrating a writing control method provided in an embodiment of this application;

[0024] Figure 5 A flowchart for adjusting the pen tip position provided in an embodiment of this application.

[0025] Figure label:

[0026] 100 - Electronic blackboard; 101 - First induction coil; 102 - Second induction coil; 103 - Control circuit;

[0027] 200-Smart pen; 201-Microcontroller; 202-Pen tip; 203-RF circuit; 204-Inductive current sensor; 205-Magnet; 206-Metal ring. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Before introducing the solution proposed in this application, the relevant technologies will first be introduced:

[0030] Existing smart capacitive pens (short for smart pens) not only have basic writing functions, but also integrate amplification functions.

[0031] In classroom teaching scenarios, the smart pen can connect to the electronic blackboard through its internal wireless communication chip, transmit the teacher's voice signal collected by the microphone to the electronic blackboard, and play it through the built-in audio codec, public address system (PA), and speaker in the electronic blackboard, thereby replacing the traditional classroom audio equipment to achieve voice amplification.

[0032] However, when the tip of the smart pen writes or slides on the surface of the electronic blackboard, the noise generated by the friction between the pen tip and the electronic blackboard is also picked up by the microphone and transmitted and amplified along with the teacher's voice signal, thus affecting the sound amplification quality.

[0033] To avoid amplifying writing noise, the common practice is to turn off the amplification function during writing. This means that the writing and amplification functions cannot be used simultaneously, preventing teachers from providing effective audio explanations while writing, thus reducing the continuity of teaching and the efficiency of interaction.

[0034] In addition, long-term physical friction not only exacerbates pen tip wear and reduces writing accuracy, but may also lead to a decline in device performance and a shortened lifespan.

[0035] In view of this, the embodiments of this application aim to provide a writing control method, an electronic blackboard, a smart pen, and an intelligent writing system, with the goal of reducing friction noise by controlling the pen tip to float above the electronic blackboard, so that the pen tip does not directly contact the electronic blackboard. These will be described in detail in the following embodiments.

[0036] Figure 1 This is a schematic diagram of the structure of an intelligent writing system provided in an embodiment of this application. Figure 1As shown, the intelligent writing system includes an electronic blackboard 100 and a smart pen 200, which are communicatively connected. This communication connection can be either wireless or wired; this embodiment does not limit the specific connection method. Wireless communication connections include WiFi, Bluetooth, mobile networks, or LoRa, among others.

[0037] The electronic blackboard 100 has a first induction coil 101 and a second induction coil 102 mounted on its screen. The electronic blackboard 100 also contains a control circuit 103, which is connected to both the first induction coil 101 and the second induction coil 102. The first induction coil 101 is a transmitting coil (Tx coil), and the second induction coil 102 is a receiving coil (Rx coil).

[0038] The smart pen 200 includes a microcontroller 201, a pen tip 202, an radio frequency circuit 203, and an inductive current sensor 204; a magnet 205 is disposed inside the pen tip 202.

[0039] The electronic blackboard 100 interacts with the smart pen 200, thereby enabling the pen tip 202 of the smart pen 200 to float above the surface of the electronic blackboard 100. Specifically:

[0040] The microcontroller 201 is used to control the radio frequency circuit 203 to transmit radio frequency signals and control the power supply of the magnet 205 to turn on when the smart pen 200 writes on the electronic blackboard, thereby energizing the magnet 205 and generating a magnetic field.

[0041] When the smart pen 200 is turned on, it can confirm that it is writing on the electronic blackboard 100.

[0042] The second induction coil 102 is used to detect the radio frequency signal sent by the smart pen 200 and send it to the control circuit 103.

[0043] The control circuit 103 is used to control the power supply of the first induction coil 101 to be turned on when a radio frequency signal is received, so that the first induction coil 101 is energized and generates a magnetic field with the same polarity as the magnetic field of the magnet 205.

[0044] For ease of explanation, the magnetic field generated by the first induction coil 101 on the electronic blackboard 100 will be referred to as the first magnetic field, and the magnetic field generated by the magnet 205 inside the smart pen 200 will be referred to as the second magnetic field.

[0045] Because the polarity of the first magnetic field is the same as that of the second magnetic field, a repulsive force is generated between the pen tip 202 and the electronic blackboard 100, thus allowing the pen tip 202 to float above the surface of the electronic blackboard 100. In this way, the pen tip 202 and the electronic blackboard 100 do not directly contact each other, avoiding frictional noise. Furthermore, when using both writing and amplification functions simultaneously, frictional noise is prevented from being amplified, thus avoiding negative impacts on the auditory experience.

[0046] In actual use, the hovering position of the pen tip 202 may change. If the hovering position of the pen tip 202 is not appropriate, it may cause friction noise or affect the writing effect. For example, when the pen tip 202 is too close to the electronic blackboard 100, it may cause friction noise; while when the pen tip 202 is too far from the electronic blackboard 100, it may affect the writing effect or even make writing impossible. Therefore, it is necessary to monitor in real time whether the distance between the pen tip 202 and the electronic blackboard 100 is within a reasonable range.

[0047] According to the principle of electromagnetic induction, the induced voltage (i.e., signal strength) in the receiving coil is inversely proportional to the square of the distance from the transmitting source (smart pen). The closer the smart pen is to a coil, the stronger the signal received by that coil; conversely, the farther away, the weaker the signal. Therefore, by detecting whether the signal strength of the radio frequency signal is within a preset signal strength range, it can be indirectly determined whether the distance between the pen tip 202 and the electronic blackboard 100 is reasonable, that is, whether the pen tip 202 and the electronic blackboard 100 are in contact while ensuring writing effect. Specifically, this process can be implemented using the following embodiment:

[0048] In some embodiments, the second induction coil 102 is also used to detect the signal strength of the radio frequency signal sent by the smart pen 200 and send it to the control circuit 103.

[0049] The control circuit 103 is also used to send the signal strength of the radio frequency signal to the smart pen 200 when it is determined that the signal strength of the radio frequency signal exceeds the preset signal strength range.

[0050] Here, the preset signal strength range can be understood as the range of radio frequency signal strength corresponding to when the pen tip 202 can both float on the surface of the electronic blackboard 100 and generate writing traces normally.

[0051] When the pen tip 202 is close to the electronic blackboard 100, the intensity of the radio frequency signal detected by the second induction coil 102 will increase. At this time, the intensity of the radio frequency signal is greater than the maximum value of the preset signal intensity range, which may generate friction noise. When the pen tip 202 is far from the electronic blackboard 100, the intensity of the radio frequency signal detected by the second induction coil 102 will decrease. At this time, the intensity of the radio frequency signal is less than the minimum value of the preset signal intensity range, which may not guarantee the writing effect.

[0052] Therefore, the microcontroller 201 can determine whether the pen tip 202 is suspended within a reasonable distance above the electronic blackboard 100 based on the comparison between the radio frequency signal strength detected by the second induction coil 102 and the maximum and minimum values ​​of the preset signal strength range. Specifically, it can determine whether the pen tip 202 is too close or too far from the electronic blackboard 100. When the distance between the pen tip 202 and the electronic blackboard 100 is determined to be too close or too far, the microcontroller 201 adjusts the current of the magnet 205 to control the smart pen 200 to suspend at a suitable position above the electronic blackboard 100, ensuring good writing performance. For ease of explanation, the maximum value of the preset signal strength range will be referred to as the first preset signal strength, and the minimum value of the preset signal strength range will be referred to as the second preset signal strength.

[0053] Specifically: the microcontroller 201 is also used to receive the signal strength of the radio frequency signal sent by the electronic blackboard 100; based on the signal strength of the radio frequency signal, it adjusts the magnetic field strength of the magnet 205 to control the smart pen 200 to float above the electronic blackboard 100.

[0054] The method of adjusting the magnetic field strength of magnet 205 based on the signal strength of radio frequency signal includes: adjusting the magnetic field strength of magnet 205 according to the comparison result between the signal strength of radio frequency signal and a preset signal strength range, so as to control the smart pen 200 to float above the electronic blackboard 100.

[0055] The adjustment process, based on a comparison between the signal strength of the radio frequency signal and a preset signal strength range, adjusts the magnetic field strength of magnet 205 to control the smart pen 200 to levitate above the electronic blackboard 100. This includes: when the signal strength of the radio frequency signal is greater than a first preset signal strength, and the difference between the two is greater than or equal to a preset difference, increasing the current of magnet 205 to control the pen tip 202 of the smart pen 200 away from the electronic blackboard 100, thereby increasing the induced current value to within a preset induced current value range; or, when the signal strength of the radio frequency signal is less than a second preset signal strength, and the difference between the two is greater than or equal to a preset difference, decreasing the current of magnet 205 to control the pen tip 202 of the smart pen 200 closer to the electronic blackboard 100, thereby decreasing the induced current value to within a preset induced current value range. The following section provides a detailed explanation of this adjustment process in conjunction with the structure of the smart pen tip 202:

[0056] Figure 2 This is a schematic diagram of the structure of a smart pen tip provided in an embodiment of this application. Figure 2 As shown, the tip 202 of the smart pen 200 has a hollow structure, and the magnet 205 is embedded in the hollow structure and fixedly connected by a metal ring 206.

[0057] The pen tip 202 and the current sensor 204 are elastically connected via an elastic device (not shown in the figure). The elastic device can be a spring.

[0058] The induced current value in the induced current sensor 204 changes with the distance between the magnet 205 and the induced current sensor 204. When the magnet 205 is close to the induced current sensor 204, the induced current in the induced current sensor 204 increases; conversely, when the magnet 205 is far away from the induced current sensor 204, the induced current in the induced current sensor 204 decreases.

[0059] When the microcontroller 201 determines that the signal strength of the radio frequency signal is greater than a first preset signal strength, and the difference between the two is greater than or equal to a preset difference, it indicates that the pen tip 202 is too close to the electronic blackboard 100. It then needs to increase the current in the magnet 205 to strengthen the magnetic force of the second magnetic field generated by the magnet 205. This increases the repulsive force between the magnet 205 and the electronic blackboard 100, causing the magnet 205 to move the pen tip 202 away from the electronic blackboard. The elastic device is compressed, bringing the magnet 205 closer to the induced current sensor 204, thereby increasing the induced current in the induced current sensor 204. When the induced current value increases to within a preset induced current value range, the distance between the magnet 205 and the induced current sensor 204 decreases to within a preset distance range, and the corresponding radio frequency signal strength also decreases to within a preset signal strength range. At this point, the pen tip 202 can suspend at a suitable position above the electronic blackboard 100.

[0060] When the microcontroller 201 determines that the signal strength of the radio frequency signal is less than the second preset signal strength, and the difference between the two is greater than or equal to the preset difference, it indicates that the pen tip 202 is too far from the electronic blackboard 100. The current in the magnet 205 needs to be reduced to decrease the magnetic force of the second magnetic field generated by the magnet 205. At this time, the repulsive force between the magnet 205 and the electronic blackboard 100 will decrease, and the magnet 205 will move the pen tip 202 closer to the electronic blackboard. The elastic device is stretched, causing the magnet 205 to move away from the induced current sensor, thereby reducing the induced current in the induced current sensor 204. When the induced current value decreases to within the preset induced current value range, the distance between the magnet 205 and the induced current sensor 204 increases to within the preset distance range, and the corresponding radio frequency signal strength also increases to within the preset signal strength range. At this time, the pen tip 202 can suspend at a suitable position above the surface of the electronic blackboard 100.

[0061] For example, during the experiment, the signal strength of the radio frequency signal and the range of induced current values ​​sensed by the corresponding induced current sensor can be measured multiple times when the pen tip 202 is not in contact with the electronic blackboard 100 and can write smoothly to generate a writing trajectory. This allows for the determination of a first preset induced current value and a second preset induced current value, as well as the corresponding first preset signal strength and second preset signal strength.

[0062] The signal strength of the radio frequency signal can be measured by the built-in signal strength detection circuit of the smart pen.

[0063] For example, according to the test, when the induced current value sensed by the induced current sensor 204 is within the current range B, the radio frequency signal strength is within the signal strength range C, and the distance between the magnet 205 and the induced current sensor 204 is within the distance range D, the pen tip 202 does not contact the electronic blackboard 100 and can write smoothly, producing a writing trajectory.

[0064] Based on the above rules, when the radio frequency signal strength is less than the minimum value of the C signal strength range, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too far. At this time, reduce the current of the magnet 205 until the induced current returns to the B current range. At this time, it can be determined that the distance between the magnet 205 and the induced current sensor 204 also returns to the D distance range. The pen tip 202 and the electronic blackboard 100 do not contact each other and can write smoothly, generating a writing trajectory.

[0065] When the radio frequency signal strength is greater than the maximum value of range C, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too close. At this time, the current of the magnet 205 is increased until the induced current returns to the current range B. At this time, it can be determined that the distance between the magnet 205 and the induced current sensor 204 has returned to the distance range D. The pen tip 202 and the electronic blackboard 100 do not contact each other and can write smoothly, producing a writing trajectory.

[0066] For example, assuming that the pen tip 202 does not contact the electronic blackboard 100 and can write smoothly, when a writing trajectory is generated, the current range of B is 0uA to 200uA, the corresponding signal strength of C is -65dBm to 0dBm, and the corresponding distance range of D is 1mm to 3mm.

[0067] When the detected radio frequency signal strength is greater than 0 dBm, it indicates that the pen tip 202 is too close to the electronic blackboard 100, and the distance between the magnet 205 and the induced current sensor 204 is greater than 3 mm. It is necessary to increase the current in the magnet 205 to increase the magnetic force of the second magnetic field generated by the magnet 205, causing the magnet 205 to move the pen tip 202 away from the electronic blackboard 100. This increases the induced current between the magnet 205 and the induced current sensor 204 to greater than or equal to 0 μA, and within the range of 0 μA to 200 μA, thus reducing the radio frequency signal strength to less than or equal to 0 dBm, and within the range of -65 dBm to 0 dBm. At this point, the distance between the magnet 205 and the induced current sensor 204 decreases to less than or equal to 3 mm, and within the range of 1 mm to 3 mm.

[0068] When the detected radio frequency signal strength is less than -65dBm, it indicates that the pen tip 202 is far from the electronic blackboard 100, and the distance between the magnet 205 and the induced current sensor 204 is less than 1mm. It is necessary to reduce the current in the magnet 205, thereby decreasing the magnetic force of the second magnetic field generated by the magnet 205. This causes the magnet 205 to move the pen tip 202 closer to the electronic blackboard 100, reducing the induced current between the magnet 205 and the induced current sensor 204 to less than or equal to 200uA, and within the range of 0uA to 200uA. This increases the radio frequency signal strength to less than or equal to -65dBm, and within the range of -65dBm to 0dBm. At this point, the distance between the magnet 205 and the induced current sensor 204 increases to greater than or equal to 1mm, and within the range of 1mm to 3mm. In some embodiments, to improve the detection accuracy of the radio frequency signal while ensuring that the first magnetic field can cover the entire electronic blackboard 100 as much as possible, the following configuration can be adopted: the first induction coil 101 includes multiple rows of first induction coils; the second induction coil 102 includes multiple rows of second induction coils; the multiple rows of first induction coils and multiple rows of second induction coils are alternately arranged. The multiple rows of first induction coils and multiple rows of second induction coils can be fabricated using MEMS (Microelectromechanical Systems) technology.

[0069] In some embodiments, in order to prevent the magnetic field from interfering with surrounding electronic devices, the pen tip 202 may be made of a high magnetic permeability material as a shield for the second magnetic field, so that the second magnetic field radiates along the axis of the pen tip while shielding magnetic fields in other directions, thereby confining the second magnetic field to a local area around the pen tip 202.

[0070] In some embodiments, for safety reasons, the power supply can be automatically cut off when the magnetic levitation system malfunctions or the current is abnormal, so that the pen tip 202 can quickly fall back to a safe position to avoid damage to the user and the electronic blackboard 100.

[0071] In some embodiments, rare-earth magnets can be used for magnet 205 to optimize the levitation effect. The high magnetic properties of rare-earth magnets can ensure that the pen tip 202 remains levitated under extremely small magnetic field changes, thereby improving system stability and response speed.

[0072] Based on the structure of the electronic blackboard 100 and the smart pen 200 described above, this application also provides embodiments of the following writing control method:

[0073] Figure 3 A flowchart illustrating a writing control method provided in an embodiment of this application. Figure 3As shown, the writing control method provided in this embodiment is applied to the electronic blackboard 100, and includes the following steps S301:

[0074] S301. When the smart pen is sensed writing on the electronic blackboard, power is supplied to the first induction coil so that the smart pen floats above the electronic blackboard and the tip of the smart pen does not touch the surface of the electronic blackboard.

[0075] The polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the tip of the smart pen.

[0076] When the electronic blackboard 100 senses writing on its surface by the smart pen 200, it supplies power to the first induction coil 101 to generate a first magnetic field.

[0077] According to the principle of "like poles repel and unlike poles attract", when the polarity of the first magnetic field generated by the first induction coil 101 is the same as the polarity of the second magnetic field radiated by the magnet 205 through the tip 202 of the smart pen 200, the first induction coil 101 and the magnet 205 will repel each other, so that the pen tip 202 does not directly contact the electronic blackboard 100, thereby enabling the smart pen 200 to levitate above the electronic blackboard 100.

[0078] The first magnetic field and the second magnetic field have the same polarity, meaning that the polarity of both the first magnetic field and the second magnetic field is either South Pole (S-type) or both North Pole (N-type).

[0079] Specifically, the magnitude, direction, and frequency of the current in the first induction coil 101 and the magnet 205 can be adjusted to regulate the magnitude and direction of the first and second magnetic fields, so that the second magnetic field has the same polarity as the first magnetic field.

[0080] When implementing step S301, it is first necessary to sense whether the smart pen 200 is writing on the electronic blackboard 100. This sensing includes: detecting the radio frequency signal emitted by the smart pen through a second induction coil, and confirming that the smart pen is writing on the electronic blackboard when the second induction coil detects the radio frequency signal emitted by the smart pen.

[0081] The second induction coil 102 is a receiving coil (Rx coil) used to detect the radio frequency (RF) signal emitted by the smart pen 200. When a user wants to write on the electronic blackboard 100 with the smart pen 200, the smart pen 200 will move closer to the electronic blackboard 100. At this time, the RF signal emitted by the RF circuit 203 inside the smart pen 200 will be detected by the second induction coil 102, and the electronic blackboard 100 will confirm that it has sensed writing by the smart pen 200 on the electronic blackboard 100. Conversely, when the smart pen 200 is away from the electronic blackboard 100, the RF signal emitted by the RF circuit 203 inside the smart pen 200 may not be detected by the second induction coil 102 or the detected RF signal may be weak, and the electronic blackboard 100 will confirm that it has not sensed writing by the smart pen 200 on the electronic blackboard 100.

[0082] In some embodiments, the electronic blackboard can also send the signal strength of the radio frequency signal detected by the second induction coil to the smart pen, so that the smart pen adjusts the magnetic field strength of the magnet according to the signal strength of the radio frequency signal, thereby controlling the smart pen to float at a suitable position above the electronic blackboard without contacting the surface of the electronic blackboard and ensuring good writing effect.

[0083] The signal strength of the radio frequency signal detected by the second induction coil 102 will change with the distance between the tip 202 of the smart pen 200 and the electronic blackboard 100.

[0084] For example, when the pen tip 202 is closer to the electronic blackboard 100, the signal strength of the radio frequency signal received by the second induction coil 102 will increase. Conversely, when the pen tip 202 is farther from the electronic blackboard 100, the signal strength of the radio frequency signal received by the second induction coil 102 will decrease.

[0085] The pen tip 202 is too close to the electronic blackboard 100, making it prone to direct contact and generating friction noise. Conversely, if the pen tip 202 is too far from the electronic blackboard 100, it may affect the writing effect. Therefore, when the electronic blackboard 100 detects the signal strength of the radio frequency signal, it can send it to the smart pen 200. The smart pen 200 then adjusts the magnetic field strength of the magnet 205 according to the signal strength of the radio frequency signal, controlling the smart pen 200 to float within a preset height range above the electronic blackboard 100. This effectively reduces friction noise during the writing process while ensuring the writing effect.

[0086] In some embodiments, the electronic blackboard 100 may also adjust the strength of the magnetic field generated by the first induction coil 101 according to the signal strength of the radio frequency signal detected by the second induction coil 102, so as to control the smart pen 200 to float above the electronic blackboard 100.

[0087] The electronic blackboard 100 adjusts the strength of the magnetic field generated by the first induction coil 101 based on the signal strength of the radio frequency signal detected by the second induction coil 102, so as to control the smart pen 200 to float above the electronic blackboard 100. This includes adjusting the magnitude of the current in the first induction coil 101 based on the comparison result between the signal strength of the radio frequency signal and a preset signal strength range, so as to control the smart pen 200 to float above the electronic blackboard 100.

[0088] In some embodiments, adjusting the current in the first induction coil 101 based on a comparison between the signal strength of the radio frequency signal and a preset signal strength to control the smart pen 200 to float above the electronic blackboard 100 includes: increasing the current in the first induction coil 101 when it is determined that the signal strength of the radio frequency signal is greater than a first preset signal strength and the difference between the two is greater than or equal to a preset difference, so that the tip 202 of the smart pen 200 moves away from the electronic blackboard 100 until the current value in the first induction coil 101 increases to within a preset current value range; or, decreasing the current in the first induction coil 101 when it is determined that the signal strength of the radio frequency signal is less than a preset signal strength and the difference between the two is greater than or equal to a preset difference, so that the tip 202 of the smart pen 200 moves closer to the electronic blackboard 100 until the current value in the first induction coil 101 decreases to within a preset current value range.

[0089] If the signal strength of the radio frequency signal is greater than the first preset signal strength, and the difference between the two is greater than or equal to the preset difference, it indicates that the pen tip 202 is too close to the electronic blackboard 100. It is necessary to increase the current in the first induction coil 101 to increase the magnetic force of the first magnetic field generated by the first induction coil 101, thereby increasing the repulsive force between the pen tip 202 and the electronic blackboard 100. This causes the magnet 205 to move the pen tip 202 away from the electronic blackboard 100. When the current in the first induction coil 101 increases to the preset current range, the pen tip 202 of the smart pen 200 is suspended in a suitable position above the electronic blackboard 100, which can ensure that the pen tip does not contact the surface of the electronic blackboard, while ensuring normal writing and generating writing trajectory.

[0090] Conversely, if the signal strength of the radio frequency signal is less than the second preset signal strength, and the difference between the two is greater than or equal to the preset difference, it indicates that the pen tip 202 is too far from the electronic blackboard 100. It is necessary to reduce the current in the first induction coil 101 to reduce the magnetic force of the first magnetic field generated by the first induction coil 101, so as to reduce the repulsive force between the pen tip 202 and the electronic blackboard 100, and cause the magnet 205 to move the pen tip 202 closer to the electronic blackboard 100. When the current in the first induction coil 101 is reduced to the preset current range, the pen tip 202 of the smart pen 200 is suspended in a suitable position above the electronic blackboard 100.

[0091] The electronic blackboard 100 may also be equipped with a current sensor connected to the first induction coil 101 to measure the current value in the first induction coil 101, thereby determining whether the current value in the first induction coil 101 has been adjusted to a preset current range.

[0092] For example, by repeatedly measuring the signal strength of the radio frequency signal and the current value in the corresponding first induction coil 101 when the pen tip 202 is not in contact with the electronic blackboard 100 and can write smoothly to generate a writing trajectory, the first preset current value and the second preset current value are determined, as well as the corresponding first preset signal strength and the second preset signal strength are determined.

[0093] The signal strength of the radio frequency signal can be measured using the built-in signal strength detection circuit of the smart pen. The current value can be measured using a current sensor.

[0094] For example, it was found through experiments that when the current value in the first induction coil 101 is within the B' current range, and at the same time, the radio frequency signal strength is within the C signal strength range, the pen tip 202 does not contact the electronic blackboard 100 and can write smoothly, generating a writing trajectory.

[0095] Based on the above rules, when the radio frequency signal strength is less than the minimum value of the C signal strength range, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too far. At this time, the current value in the first induction coil 101 is reduced until the current returns to the B' current range. At this time, it can be determined that the distance between the pen tip 202 and the electronic blackboard 100 has returned to a reasonable distance range.

[0096] When the radio frequency signal strength is greater than the maximum value of range C, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too close. At this time, the current value in the first induction coil 101 is increased until the current returns to the range of current B'. At this time, it can be determined that the distance between the pen tip 202 and the electronic blackboard 100 has returned to a reasonable distance range.

[0097] Figure 4A flowchart illustrating a writing control method provided in an embodiment of this application. Figure 4 As shown, the writing control method provided in this embodiment is applied to the smart pen 200, and includes the following steps S401:

[0098] S401. When the smart pen writes on the electronic blackboard, the smart pen controls the magnet to radiate a magnetic field through the tip of the smart pen, and triggers the electronic blackboard to supply power to the first induction coil used to generate the magnetic field, so that the smart pen levitates above the electronic blackboard.

[0099] The polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the tip of the smart pen.

[0100] In this embodiment, the magnet 205 can be an electromagnet, which exhibits magnetism when energized. By changing the magnitude, direction, and frequency of the current in the electromagnet, the magnitude and direction of the magnetic force of the second magnetic field radiated by the magnet can be altered.

[0101] When the smart pen 200 writes on the electronic blackboard 100, the microcontroller 201 in the smart pen 200 can control the power supply device of the magnet 205 to supply power to the magnet 205, so that it is energized and thus generates a second magnetic field with the same polarity as the first magnetic field.

[0102] In some embodiments, when the smart pen 200 writes on the electronic blackboard 100, the control radio frequency circuit 203 transmits a radio frequency signal so that when the second induction coil 102 detects the radio frequency signal, the electronic blackboard 100 supplies power to the first induction coil 101.

[0103] When the smart pen 200 writes on the electronic blackboard 100, the microcontroller 201 in the smart pen 200 can also control the radio frequency circuit 203 to emit radio frequency signals. When this radio frequency signal is detected by the second induction coil 102, the electronic blackboard 100 determines that the smart pen 200 is writing on the electronic blackboard 100, and triggers the power supply device controlling the first induction coil 101 to supply power to it, thereby causing current to flow through the first induction coil 101 and generating a first magnetic field. Since the two magnetic fields have the same polarity, a repulsive force is generated between the pen tip 202 and the electronic blackboard 100. This force allows the pen tip 202 to float in a suitable position above the electronic blackboard 100, ensuring that the pen tip does not contact the electronic blackboard while ensuring a good writing effect and producing a writing trajectory.

[0104] In practical applications, the hovering position of the pen tip 202 above the electronic blackboard 100 may change. If the hovering position of the pen tip 202 is inappropriate, it may generate friction noise or affect the writing effect. For example, when the pen tip 202 is too close to the surface of the electronic blackboard 100, friction noise will be generated; conversely, when the pen tip 202 is too far from the surface of the electronic blackboard 100, it may affect the writing effect or even make writing impossible. In order to ensure the writing effect while reducing friction noise, this application also provides the following embodiments:

[0105] Figure 5 A flowchart illustrating the adjustment of the pen tip position provided in an embodiment of this application. Figure 5 As shown, this embodiment includes the following steps S501-S502:

[0106] S501, Receive the signal strength of the radio frequency signal sent by the electronic blackboard 100, wherein the signal strength of the radio frequency signal is obtained by sensing the second induction coil 102.

[0107] Because the tip 202 of the smart pen 200 is relatively close to the electronic blackboard 100, it is prone to direct contact with the electronic blackboard 100, thus generating friction noise; while when the tip 202 is too far from the electronic blackboard 100, it may affect the writing effect. Therefore, it is necessary to detect in real time whether the distance between the tip 202 of the smart pen 200 and the electronic blackboard 100 is within a reasonable range.

[0108] According to the principle of electromagnetic induction, the induced voltage (i.e., signal strength) in the receiving coil is inversely proportional to the square of the distance from the transmitting source (smart pen). The closer the transmitting source is to a coil, the stronger the signal received by that coil; conversely, the farther away, the weaker the signal.

[0109] The signal strength of the radio frequency signal received by the second induction coil 102 will change with the distance between the pen tip 202 and the electronic blackboard 100. For example, when the pen tip 202 is closer to the electronic blackboard 100, the signal strength of the radio frequency signal received by the second induction coil 102 is stronger. Conversely, when the pen tip 202 is farther from the electronic blackboard 100, the signal strength of the radio frequency signal received by the second induction coil 102 will be weaker.

[0110] Therefore, based on the intensity of the radio frequency signal sensed by the second induction coil 102, it can be determined whether the distance between the pen tip 202 of the smart pen 200 and the electronic blackboard 100 is within a reasonable range, thereby ensuring that the two do not come into contact and ensuring a good writing effect.

[0111] S502: Based on the signal strength of the radio frequency signal, adjust the magnetic field strength of the magnet to control the smart pen to float above the electronic blackboard.

[0112] Step S502 includes: adjusting the magnitude of the current in the magnet 205 based on the comparison result between the signal strength of the radio frequency signal and the preset signal strength range, so as to control the smart pen 200 to float above the electronic blackboard 100.

[0113] Specifically, based on the comparison between the signal strength of the radio frequency signal and the preset signal strength, the magnitude of the current inside the magnet is adjusted to control the smart pen 200 to float above the electronic blackboard 100 and generate writing trajectories. This includes the following implementation methods:

[0114] In some implementations, the magnitude of the current in the magnet 205 is adjusted based on the comparison between the signal strength of the radio frequency signal and a preset signal strength range to control the smart pen 200 to float above the electronic blackboard 100. This includes: when it is determined that the signal strength of the radio frequency signal is greater than a first preset signal strength and the difference between the two is greater than or equal to a preset difference, the current in the magnet 205 is increased to control the pen tip 202 of the smart pen 200 to move away from the electronic blackboard until the induced current value increases to within the preset induced current value range.

[0115] Specifically, increasing the current within magnet 205 increases the magnetic force of the second magnetic field generated by magnet 205. This increases the repulsive force between magnet 205 and the electronic blackboard 100, causing magnet 205 to move pen tip 202 away from the electronic blackboard 100. At this point, the elastic device is compressed, and magnet 205 approaches the induced current sensor 204, reducing the distance between them to a preset range. The induced current value increases accordingly, thereby increasing the distance between pen tip 202 and the electronic blackboard 100. When the induced current value increases to a preset range, it is determined that the pen tip of the smart pen 200 is suspended above the electronic blackboard 100, without contact, ensuring good writing performance and producing a writing trajectory.

[0116] In other implementations, the magnitude of the current in the magnet 205 is adjusted based on the comparison between the signal strength of the radio frequency signal and a preset signal strength range to control the smart pen 200 to float above the electronic blackboard 100. This includes: when it is determined that the signal strength of the radio frequency signal is less than a second preset signal strength, and the difference between the two is greater than or equal to a preset difference, the current in the magnet 205 is reduced to control the tip of the smart pen to approach the electronic blackboard until the induced current value decreases and falls within the preset induced current value range.

[0117] Specifically, reducing the current in magnet 205 decreases the magnetic force of the second magnetic field generated by magnet 205. This reduces the repulsive force between magnet 205 and the electronic blackboard 100, causing magnet 205 to move pen tip 202 closer to the electronic blackboard 100. The elastic device is stretched, and magnet 205 moves away from the induced current sensor 204, increasing the distance between them to a preset range. The induced current value decreases accordingly, further reducing the distance between pen tip 202 and the electronic blackboard 100. When the induced current value decreases to a preset range, it is determined that the pen tip of the smart pen 200 is suspended above the electronic blackboard 100, with no contact between the two, ensuring good writing performance and producing a writing trajectory.

[0118] The smart pen incorporates an internal current sensor that outputs a corresponding induced current value based on changes in the distance between the magnet and the sensor. When the induced current value output by the sensor is within a preset range, the distance between the magnet and the sensor is within a preset distance range, and the radio frequency signal strength is within a preset signal strength range, the pen tip does not contact the electronic blackboard surface, and the pen can write smoothly on the blackboard.

[0119] For example, during the experiment, the signal strength of the radio frequency signal and the range of induced current values ​​sensed by the corresponding induced current sensor can be measured multiple times when the pen tip 202 is not in contact with the electronic blackboard 100 and can write smoothly to generate a writing trajectory. This allows for the determination of a first preset induced current value and a second preset induced current value, as well as the corresponding first preset signal strength and second preset signal strength.

[0120] The signal strength of the radio frequency signal can be measured by the built-in signal strength detection circuit of the smart pen.

[0121] For example, according to experimental measurements, when the induced current value sensed by the induced current sensor 204 is within the current range B, and the radio frequency signal strength is within the signal strength range C, and the distance between the magnet 205 and the induced current sensor 204 is within the distance range D, the pen tip 202 does not contact the electronic blackboard 100 and can write smoothly, generating a writing trajectory.

[0122] Based on the above rules, when the radio frequency signal strength is less than the minimum value of the C signal strength range, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too far. At this time, reduce the current of the magnet 205 until the induced current returns to the B current range. At this time, it can be determined that the distance between the magnet 205 and the induced current sensor 204 also returns to the D distance range. The pen tip 202 and the electronic blackboard 100 do not contact each other and can write smoothly, generating a writing trajectory.

[0123] When the radio frequency signal strength is greater than the maximum value of range C, it indicates that the distance between the pen tip 202 and the electronic blackboard 100 is too close. At this time, the current of the magnet 205 is increased until the induced current returns to the current range B. At this time, it can be determined that the distance between the magnet 205 and the induced current sensor 204 has returned to the distance range D. The pen tip 202 and the electronic blackboard 100 do not contact each other and can write smoothly, producing a writing trajectory.

[0124] For example, assuming that the pen tip 202 does not contact the electronic blackboard 100 and can write smoothly, when a writing trajectory is generated, the current range of B is 0uA to 200uA, the corresponding signal strength of C is -65dBm to 0dBm, and the corresponding distance range of D is 1mm to 3mm.

[0125] When the detected radio frequency signal strength is greater than 0 dBm, it indicates that the pen tip 202 is too close to the electronic blackboard 100, and the distance between the magnet 205 and the induced current sensor 204 is greater than 3 mm. It is necessary to increase the current in the magnet 205 to increase the magnetic force of the second magnetic field generated by the magnet 205, causing the magnet 205 to move the pen tip 202 away from the electronic blackboard 100. This increases the induced current between the magnet 205 and the induced current sensor 204 to greater than or equal to 0 μA, and within the range of 0 μA to 200 μA, thus reducing the radio frequency signal strength to less than or equal to 0 dBm, and within the range of -65 dBm to 0 dBm. At this point, the distance between the magnet 205 and the induced current sensor 204 decreases to less than or equal to 3 mm, and within the range of 1 mm to 3 mm.

[0126] When the detected radio frequency signal strength is less than -65dBm, it indicates that the pen tip 202 is far from the electronic blackboard 100, and the distance between the magnet 205 and the induced current sensor 204 is less than 1mm. It is necessary to reduce the current in the magnet 205, thereby decreasing the magnetic force of the second magnetic field generated by the magnet 205. This causes the magnet 205 to move the pen tip 202 closer to the electronic blackboard 100, reducing the induced current between the magnet 205 and the induced current sensor 204 to less than or equal to 200uA, and within the range of 0uA to 200uA. This increases the radio frequency signal strength to less than or equal to -65dBm, and within the range of -65dBm to 0dBm. At this point, the distance between the magnet 205 and the induced current sensor 204 increases to greater than or equal to 1mm, and within the range of 1mm to 3mm.

[0127] In some embodiments, the capacitive touchscreen of the electronic blackboard has metallic row and column lines. The position of the touch point can be determined by detecting the induced current of the capacitor at the intersection of the row and column lines. The coordinates of adjacent points in time sequence can then form a writing trajectory, thereby enabling contactless writing on the electronic blackboard with the pen tip.

[0128] The magnetic levitation pen tip technology used in this embodiment effectively solves the noise problem caused by physical friction during writing in traditional capacitive pens, achieving silent writing. Whether used in classrooms, meeting rooms, or other scenarios requiring high concentration, it will not produce any disturbing noise, significantly improving the user's writing comfort.

[0129] Thanks to the floating design of the pen tip, the friction between it and the electronic blackboard is almost zero, making the writing process smoother and more fluid, with even and natural strokes. This not only improves the accuracy of writing but also enhances the visual aesthetics of the writing, bringing users a better writing experience.

[0130] Furthermore, the magnetic levitation structure avoids direct contact between the pen tip and the electronic blackboard surface, significantly reducing wear and effectively extending the lifespan of the pen tip. Even after long-term frequent use, it maintains stable writing performance, avoiding problems such as positioning deviation or writing insensitivity caused by pen tip wear.

[0131] Furthermore, by using high-precision sensors (such as optical sensors or Hall effect sensors) and high-performance microprocessors, real-time and precise control of the pen tip's hovering height and spatial position can be achieved. Whether in different operating scenarios such as rapid writing or detailed drawing, the pen tip trajectory can be accurately captured, ensuring the stability and accuracy of the input signal and comprehensively guaranteeing high responsiveness and high fidelity in writing and drawing.

[0132] In summary, this magnetic levitation pen tip has achieved comprehensive optimization in terms of quietness, smoothness, durability, and precision control, significantly improving the overall performance and user experience of intelligent writing tools.

[0133] For the foregoing method embodiments, in order to simplify the description, they are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0134] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0135] The steps in the methods of the various embodiments of this application can be adjusted, merged, or deleted in order according to actual needs, and the technical features described in each embodiment can be replaced or combined.

[0136] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0137] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A writing control method characterized by, The application is applied to an electronic blackboard, a screen of the electronic blackboard is paved with a first induction coil for generating a magnetic field; the method comprises: When the smart pen is sensed to write on the electronic blackboard, the first induction coil is powered to make the smart pen hover above the electronic blackboard, and the nib of the smart pen does not contact the surface of the electronic blackboard; The nib of the smart pen is internally provided with a magnet, and the polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the nib of the smart pen.

2. The method of claim 1, wherein, The screen of the electronic blackboard is also paved with a second induction coil for detecting a radio frequency signal, and the smart pen is internally provided with a radio frequency circuit for emitting a radio frequency signal; The method further comprises: The second induction coil detects the radio frequency signal emitted by the smart pen; When the second induction coil detects the radio frequency signal emitted by the smart pen, it is confirmed that the smart pen writes on the electronic blackboard.

3. The method of claim 2, wherein, The method further comprises: The electronic blackboard sends the signal strength of the radio frequency signal detected by the second induction coil to the smart pen, so that the smart pen adjusts the magnetic field strength of the magnet according to the signal strength of the radio frequency signal to control the smart pen to hover above the electronic blackboard.

4. The method of claim 2, wherein, The method further comprises: The electronic blackboard adjusts the strength of the magnetic field generated by the first induction coil according to the signal strength of the radio frequency signal detected by the second induction coil to control the smart pen to hover above the electronic blackboard.

5. A writing control method characterized by, The application is applied to a smart pen, a magnet is arranged in the nib of the smart pen, and the method comprises: When the smart pen writes on the electronic blackboard, the smart pen controls the magnet to radiate a magnetic field through the nib of the smart pen and triggers the electronic blackboard to power the first induction coil for generating a magnetic field, so that the smart pen hovers above the electronic blackboard, and the nib of the smart pen does not contact the surface of the electronic blackboard; The first induction coil is paved on the screen of the electronic blackboard, and the polarity of the magnetic field generated by the first induction coil is the same as the polarity of the magnetic field radiated by the magnet through the nib of the smart pen.

6. The method of claim 5, wherein, The smart pen is internally provided with a radio frequency circuit for emitting a radio frequency signal, and the screen of the electronic blackboard is also paved with a second induction coil for detecting a radio frequency signal; The method further comprises: When the smart pen writes on the electronic blackboard, the radio frequency circuit is controlled to emit a radio frequency signal, so that when the second induction coil detects the radio frequency signal, the electronic blackboard powers the first induction coil.

7. The method of claim 6, wherein, The method further comprises: The signal strength of the radio frequency signal sent by the electronic blackboard is received; the signal strength of the radio frequency signal is sensed by the second induction coil; Based on the signal strength of the radio frequency signal, the magnetic field strength of the magnet is adjusted to control the smart pen to hover above the electronic blackboard.

8. The method of claim 7, wherein, Based on the signal strength of the radio frequency signal, the magnetic field strength of the magnet is adjusted to control the smart pen to hover above the electronic blackboard, which comprises: Based on the comparison between the signal strength of the radio frequency signal and a preset signal strength range, the magnitude of the current in the magnet is adjusted to control the smart pen to levitate above the electronic blackboard.

9. The method of claim 8, wherein, The maximum value of the preset signal strength range is the first preset signal strength, and the minimum value of the preset signal strength range is the second preset signal strength. The smart pen also contains an induced current sensor, used to output a corresponding induced current value based on changes in the distance between the magnet and the induced current sensor; the step of adjusting the magnitude of the current in the magnet based on a comparison between the signal strength of the radio frequency signal and a preset signal strength range, to control the smart pen to levitate above the electronic blackboard, includes: When it is determined that the signal strength of the radio frequency signal is greater than the first preset signal strength, and the difference between the two is greater than or equal to the preset difference, the current in the magnet is increased to control the tip of the smart pen to move away from the electronic blackboard until the induced current value increases to within the preset induced current value range. or, When it is determined that the signal strength of the radio frequency signal is less than the second preset signal strength, and the difference between the two is greater than or equal to the preset difference, the current in the magnet is reduced to control the tip of the smart pen to move closer to the electronic blackboard until the induced current value is reduced to the range of the preset induced current value. When the induced current value output by the induced current sensor is within the preset induced current value range, the tip of the smart pen does not contact the surface of the electronic blackboard, and it is able to generate a writing trajectory on the electronic blackboard.

10. An electronic blackboard, characterized by include: A first induction coil for generating a magnetic field is laid on the screen of the electronic blackboard; The electronic blackboard is configured to implement the writing control method as described in any one of claims 1 to 4.

11. A smart pen, characterized by The smart pen has a magnet inside its tip and is configured to implement the writing control method as described in any one of claims 5 to 9.

12. An intelligent writing system characterized by, Including electronic blackboards and smart pens; The electronic blackboard screen is covered with a first induction coil for generating a magnetic field, and the tip of the smart pen contains a magnet. The electronic blackboard is configured to implement the writing control method as described in any one of claims 1 to 4; And / or, The smart pen is configured to implement the writing control method as described in any one of claims 5 to 9.

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