Electromagnetic pen and electromagnetic touch system
By using resonant circuits and key components in the electromagnetic pen to control the frequency of the resonant signal, the problem of existing electromagnetic pens requiring built-in Bluetooth modules and additional batteries is solved, and complex control functions without additional batteries are realized, reducing costs.
Patent Information
- Application Number
- CN202422112380.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-28
AI Technical Summary
Existing electromagnetic pens require built-in Bluetooth modules and additional batteries when implementing complex control functions, resulting in high costs and increased complexity.
An electromagnetic pen is designed, using resonant circuits and key components. Through the cooperation of variable capacitors and key components, the frequency of the resonant signal is controlled to achieve complex control functions without additional batteries.
This enables the expansion of the electromagnetic pen control function without the need for additional batteries, reducing costs and simplifying design.
Smart Images
Figure CN222939468U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of electronic devices, and particularly to an electromagnetic pen and an electromagnetic touch control system. Background Art
[0002] An electromagnetic pen can achieve a writing function by touching on an electromagnetic screen carried by an electronic device.
[0003] In related technologies, when using an electromagnetic pen to achieve complex control functions (for example, using the electromagnetic pen to adjust the thickness of a writing stroke), it is necessary to built-in a wireless communication module such as Bluetooth in the electromagnetic pen and pair it through a corresponding communication protocol to transmit control instructions. This method not only requires an additional battery to supply power in the electromagnetic pen, but also has a high implementation cost. Utility Model Content
[0004] To overcome the problems existing in related technologies, the present disclosure provides an electromagnetic pen and an electromagnetic touch control system.
[0005] According to a first aspect of an embodiment of the present disclosure, there is provided an electromagnetic pen, including:
[0006] A resonant circuit, including an inductor, a resistor, and a variable capacitor, for emitting a resonant signal;
[0007] A button assembly, connected to the variable capacitor, for controlling the capacitance value of the variable capacitor so as to control the resonant frequency of the resonant signal.
[0008] In some embodiments, the inductor, the resistor, and the variable capacitor are connected in series in sequence.
[0009] In some embodiments, the inductor, the resistor, and the variable capacitor are connected in parallel with each other.
[0010] In some embodiments, the inductor is wound around the tip of the electromagnetic pen.
[0011] In some embodiments, the button assembly has multiple trigger states, and different trigger states correspond to different capacitance values of the variable capacitor.
[0012] In some embodiments, the variable capacitor includes: a first capacitor plate and a second capacitor plate;
[0013] The button assembly is connected to the first capacitor plate and / or the second capacitor plate. When the button assembly is in different trigger states, the effective area and / or the distance between the first capacitor plate and the capacitor plate are different.
[0014] In some embodiments, the button assembly includes any one of a push-button, a lever button, and a roller button.
[0015] According to a second aspect of the embodiments of the present disclosure, there is provided an electromagnetic touch system, including: an electronic device and an electromagnetic pen as described in the first aspect;
[0016] Wherein, the electronic device includes: a screen assembly and a control assembly;
[0017] The screen assembly includes: a display layer and an electromagnetic induction layer; wherein, the display layer is used for displaying information, and the electromagnetic induction layer is used for receiving resonance signals;
[0018] The control assembly is respectively connected to the display layer and the electromagnetic induction layer.
[0019] In some embodiments, the electromagnetic induction layer includes an antenna array;
[0020] The antenna array can generate a magnetic field in the energized state, so that the inductor of the electromagnetic pen can generate an induced current and transmit a resonance signal;
[0021] The antenna array can receive a resonance signal in the powered-off state and determine the position of the electromagnetic pen according to the intensity of the resonance signal.
[0022] In some embodiments, when the distance between the electromagnetic pen and the screen assembly is less than the induction distance, the control assembly is used to display a position identifier of the electromagnetic pen on the display layer according to the position of the electromagnetic pen returned by the antenna array.
[0023] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:
[0024] The electromagnetic pen provided by the embodiments of the present disclosure includes a resonance circuit and a button assembly. Among them, the resonance circuit can send resonance signals. There is a variable capacitor in the resonance circuit, and the button assembly is connected to the variable capacitor. By controlling the capacitance value of the variable capacitor through the button assembly, the resonance frequency of the resonance signal can be controlled. Thus, the electromagnetic pen provided by the embodiments of the present disclosure can change the resonance frequency of the emitted resonance signal through the button, enabling the electronic device to sense the operation of the button assembly on the electromagnetic pen, so as to expand the control function of the electromagnetic pen without the need for a battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 Shows a schematic structural diagram of an electromagnetic pen in an embodiment of the present disclosure.
[0026] Figure 2 Shows a schematic structural diagram of another electromagnetic pen in an embodiment of the present disclosure.
[0027] Figure 3 Shows a schematic structural diagram of an electromagnetic touch system in an embodiment of the present disclosure.
[0028] Reference Numerals:
[0029] 110 - Inductor; 120 - Resistor; 130 - Variable Capacitor; 140 - Button Assembly; 150 - Nib; 310 - Stylus; 320 - Screen Assembly; 321 - Display Layer; 322 - Electromagnetic Induction Layer; 330 - Control Assembly. Detailed Description of the Embodiment
[0030] Here, exemplary embodiments will be described in detail, and examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.
[0031] In addition, the terms "first", "second", etc. used in the present disclosure are only for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0032] Figure 1 The structural schematic diagram of a stylus in an embodiment of the present disclosure is shown, as Figure 1 shown, the stylus may include: a resonant circuit and a button assembly 140.
[0033] Among them, the resonant circuit includes: an inductor 110, a resistor 120, and a variable capacitor 130. The inductor 110, the resistor 120, and the variable capacitor 130 can form an RLC circuit and can emit a resonant signal through the inductor 110.
[0034] The button assembly 140 is connected to the variable capacitor 130 and can be used to control the capacitance value of the variable capacitor 130 so as to control the resonant frequency of the resonant signal.
[0035] It can be understood that in the RLC circuit, the resonant frequency can be expressed by the following formula (1).
[0036]
[0037] Where f 0 is the resonant frequency, L is the inductance value, and C is the capacitance value of the variable capacitor.
[0038] Thus, it can be seen that when the capacitance value of the variable capacitor 130 changes, the resonant frequency of the RLC circuit will change accordingly.
[0039] In some embodiments, the button assembly 140 includes any one of a push-button, a lever button, and a roller button. Those skilled in the art can understand that these types of button assemblies 140 can physically change the capacitance value of the variable capacitor 130 without additional power support.
[0040] Exemplarily, the capacitance value of the variable capacitor 130 can be adjusted by changing the relative position between the capacitor plates. For example, changing the effective area between the capacitor plates or the distance between the capacitor plates.
[0041] That is to say, by operating the button assembly 140 connected to the variable capacitor 130, the position of at least one capacitor plate can be changed, thereby realizing the adjustment of the capacitance value.
[0042] In some embodiments, the button assembly 140 has multiple trigger states, and different trigger states correspond to different capacitance values of the variable capacitor 130.
[0043] Exemplarily, the variable capacitor 130 may include a first capacitor plate and a second capacitor plate. The button assembly 140 is connected to the first capacitor plate and / or the second capacitor plate. When the button assembly 140 is in different trigger states, the effective area and / or the distance between the first capacitor plate and the capacitor plate are different.
[0044] Exemplarily, the button assembly 140 is preset with multiple fixed gears, and the capacitance value of the variable capacitor 130 corresponding to each gear is fixed. Correspondingly, the resonant frequency corresponding to each gear is also fixed.
[0045] Therefore, an electronic device supporting electromagnetic induction can identify the resonant frequency, determine the trigger state of the button assembly 140, and execute corresponding preset program instructions, thereby realizing non-contact interaction between the electromagnetic pen and the electronic device.
[0046] In some embodiments, the inductor 110 is wound around the tip 150 of the electromagnetic pen, so that an electronic device supporting electromagnetic touch can accurately sense the position of the tip 150 of the electromagnetic pen.
[0047] Figure 2 Show a schematic structural diagram of another electromagnetic pen in an embodiment of the present disclosure. Different from Figure 1 the electromagnetic pen shown, in Figure 2 the electromagnetic pen shown, the inductor 110, the resistor 120, and the variable capacitor 130 are connected in parallel with each other.
[0048] In the inductor 110, the resistor 120, and the variable capacitor 130 connected in parallel with each other, the resonant frequency can be expressed by the following formula (2).
[0049]
[0050] Among them, f 0 is the resonant frequency, L is the inductance value, C is the capacitance value of the variable capacitor, and R is the resistance value of the resistor.
[0051] When the resistance value of the resistor R is extremely small, the above formula (2) can be approximately equivalent to formula (1), that is, by changing the capacitance value of the variable capacitor 130, the effect of adjusting the resonant frequency can be achieved.
[0052] Thus, it can be seen that Figure 2 the principle of solving problems by the electromagnetic pen shown Figure 1 is similar to that of the electromagnetic pen shown above. For the sake of concise description, the repeated parts will not be elaborated.
[0053] Figure 3 shows a schematic structural diagram of an electromagnetic touch system in an embodiment of the present disclosure. As Figure 3 shown, the electromagnetic touch system includes an electronic device and Figure 1 or Figure 2 the electromagnetic pen 310 shown.
[0054] Exemplarily, the electronic device may include a screen component 320 and a control component 330.
[0055] The screen component 320 may include: a display layer 321 and an electromagnetic induction layer 322.
[0056] Among them, the display layer 321 is used to display information, which may be an LCD module or an OLED module, etc.
[0057] The electromagnetic induction layer 322 may be used to receive a resonant signal, and it may be provided on the back side of the display layer 321, that is, the side where the display layer 321 does not display information.
[0058] The control component 330 is respectively connected to the display layer 321 and the electromagnetic induction layer 322.
[0059] In some embodiments, the electromagnetic induction layer 322 includes an antenna array (not shown in the figure). Among them, the antenna array may be composed of a plurality of coils that intersect horizontally and vertically.
[0060] The control component 330 can control the working state of the antenna array to switch the antenna array between the powered-on state and the powered-off state.
[0061] In some embodiments, when the antenna array is in the powered-on state, it can generate a magnetic field through the coil, so that an induced current is generated in the inductance of the electromagnetic pen 310, and the variable capacitor of the electromagnetic pen 310 is charged.
[0062] When the antenna array is in the powered-off state, it can receive the resonant signal generated by the resonant circuit through the coil and judge the position of the electromagnetic pen 310 according to the intensity of the resonant signal.
[0063] Exemplarily, according to the intensity of the resonant signal, the intersection of the horizontal and vertical coils with the highest received resonant signal intensity can be used as the position of the electromagnetic pen 310.
[0064] In some embodiments, when the distance between the electromagnetic pen 310 and the screen assembly 320 is less than the induction distance, the control component 330 is configured to display a position identifier of the electromagnetic pen 310 on the display layer 321 according to the position of the electromagnetic pen 310 returned by the antenna array.
[0065] Exemplarily, the induction distance may be the maximum distance at which the antenna array can sense the resonant signal emitted by the electromagnetic pen 310. The position identifier may be a graphic identifier such as "○", "×", etc.
[0066] In some embodiments, the control component 330 is further configured to execute a preset program instruction when the frequency of the resonant signal changes.
[0067] Exemplarily, when the distance between the electromagnetic pen 310 and the screen assembly 320 is less than the induction distance, the antenna array can receive the resonant signal emitted by the electromagnetic pen 310 and determine the position of the electromagnetic pen 310 according to the intensity of the resonant signal. At the same time, when the antenna array detects that the resonant frequency of the resonant signal changes, the frequency of the resonant signal can be fed back to the control component 330 so that the control component 330 can sense the change in the resonant frequency and execute the corresponding program instruction.
[0068] For example, the writing stroke style of the electromagnetic pen 310 can be switched in a preset order each time the resonant frequency change is detected. It is also possible to switch the writing stroke style of the electromagnetic pen 310 to the style corresponding to the first resonant frequency when the resonant frequency change is detected as the first resonant frequency, and switch the writing stroke style of the electromagnetic pen 310 to the style corresponding to the second resonant frequency when the resonant frequency change is detected as the second resonant frequency.
[0069] For another example, each time the resonant frequency change is detected, the text near the hovering position of the electromagnetic pen 310 (i.e., the position identifier displayed on the display layer 321) can be captured and the corresponding explanatory information or translation information can be output.
[0070] Thus, the electromagnetic touch control system provided by the embodiments of the present disclosure can achieve various interaction modes through the cooperation of the electromagnetic pen and the electronic device.
[0071] The embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0072] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should equally be regarded as the content disclosed by the present disclosure.
Claims
1. An electromagnetic pen, characterized in that: include: A resonant circuit, including an inductor, a resistor and a variable capacitor, for transmitting a resonant signal; The key assembly is connected to the variable capacitor and is used to control the capacitance of the variable capacitor so as to control the resonant frequency of the resonant signal.
2. The electromagnetic pen according to claim 1, characterized in that: The inductor, the resistor and the variable capacitor are connected in series in sequence.
3. The electromagnetic pen according to claim 1, characterized in that: The inductor, the resistor and the variable capacitor are connected in parallel.
4. The electromagnetic pen according to any one of claims 1 to 3, characterized in that: The inductor is wound on the pen tip of the electromagnetic pen.
5. The electromagnetic pen according to claim 1, characterized in that: The button assembly has multiple trigger states, and different trigger states correspond to different capacitance values of the variable capacitor.
6. The electromagnetic pen according to claim 1 or 5, characterized in that: The variable capacitor comprises: a first capacitor plate and a second capacitor plate; The button assembly is connected to the first capacitor plate and / or the second capacitor plate. When the button assembly is in different triggering states, the effective area and / or the spacing between the first capacitor plate and the capacitor plate are different.
7. The electromagnetic pen according to claim 1 or 5, characterized in that: The button assembly includes any one of a press button, a lever button and a roller button.
8. An electromagnetic touch system, characterized in that: include: An electronic device and an electromagnetic pen as claimed in any one of claims 1 to 4; Wherein, the electronic device comprises: a screen component and a control component; The screen assembly includes: a display layer and an electromagnetic induction layer; wherein the display layer is used to display information, and the electromagnetic induction layer is used to receive a resonance signal; The control component is connected to the display layer and the electromagnetic induction layer respectively.
9. The system according to claim 8, characterized in that The electromagnetic induction layer includes an antenna array; The antenna array can generate a magnetic field when powered on, so that the inductance of the electromagnetic pen can generate an induced current and emit a resonant signal; The antenna array can receive a resonance signal in a power-off state, and determine the position of the electromagnetic pen according to the strength of the resonance signal.
10. The system according to claim 9, characterized in that When the distance between the electromagnetic pen and the screen component is less than the sensing distance, the control component is used to display the position mark of the electromagnetic pen on the display layer according to the position of the electromagnetic pen returned by the antenna array.