A hybrid digital technology-based original handwriting electromagnetic pen

Abstract

The application discloses a mixed digital technology-based original handwriting electromagnetic pen, which adopts a mixed synchronous transmission reporting system of analog signals and digital signals, and the MCU control circuit is used for synchronous calculation of the two signals and difference value data complementation, the MCU control circuit is used for high-precision data operation and processing, the original handwriting writing function can be realized, the mouse function can also be realized, and the cost investment is reduced; the MCU control circuit is used for separate collection and calculation of analog signals and digital signals, and the analog signals and the digital signals are used as the complement to reserve useful signal data, so that the packet loss phenomenon is prevented; the MCU control circuit is used for calculation of the time and the high or low of the frequency of the data signal waveform collected by the ADC analog-digital conversion circuit, so that the stability of writing water is controlled, and the pen peak is obvious.

Description

Technical Field

[0001] This invention belongs to the field of computer input device manufacturing technology, specifically relating to an original handwriting electromagnetic pen based on hybrid digital technology. Background Technology

[0002] The core principle of the original handwriting electromagnetic pen is electromagnetic induction technology; the technical stability of the original handwriting electromagnetic pen in the current technology still has certain defects; the existing digital pens on the market use a single method to report data to the system, that is, the analog signal is only converted into a digital signal and reported to the system. The data at the reporting system end is prone to packet loss, the pen strokes are not obvious when writing, and the ink flow is not stable.

[0003] Current digital pens mainly use pressure capacitors and pressure resistors to calculate pressure values ​​by detecting voltage through an ADC (Analog-Converter). These two methods are costly and the consistency of their effects is not ideal. They can also produce certain deviations in different usage environments, especially in low-temperature environments. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, the present invention aims to provide an original handwriting electromagnetic pen based on hybrid digital technology, which can improve the accuracy of data calculation, realize the original handwriting writing function, and also realize mouse function, while reducing cost investment; and prevent leakage, ensure stable ink flow, and clear pen strokes.

[0005] The technical solution adopted in this invention is as follows:

[0006] An original handwriting electromagnetic pen based on hybrid digital technology includes a pen body, a writing section at the front of the pen body, and a circuit section at the rear of the pen body;

[0007] The writing unit includes a pen tip, a magnetic ring, a handwriting emission coil, and a writing support. The magnetic ring is coaxially disposed within the inner cavity of the writing support, and the handwriting emission coil is fitted onto the outer surface of the writing support. The pen tip is coaxially disposed at the center of the magnetic ring and the writing support, and the pen tip is used to move and write on the sensor antenna board of the display screen. The handwriting emission coil is used to emit a writing analog signal according to the content written by the pen tip.

[0008] The circuit section includes a PCB circuit board, a handwriting emission circuit, an oscillation circuit, an ADC analog-to-digital converter circuit, and an MCU control circuit.

[0009] The front end of the PCB circuit board is fixedly connected to the rear end of the writing bracket; the original handwriting emission circuit, oscillation circuit, ADC analog-to-digital circuit and MCU control circuit are arranged on the PCB circuit board in a front-to-back order.

[0010] The MCU control circuit includes a control chip, an analog signal module, and a digital signal module. The analog signal module receives the writing analog signal and transmits it to the control chip. The ADC analog-to-digital converter is used to acquire the voltage of the writing analog signal, convert it into a digital signal, and input it to the digital signal module of the MCU control circuit. The control chip independently calculates the writing analog signal and the digital signal to obtain the final pressure value data, which is then transmitted to the display screen sequentially through the oscillation circuit, the original handwriting emission circuit, the original handwriting emission coil, the magnetic ring, and the pen tip.

[0011] Furthermore, the controlled chip performs synchronous calculations on analog and digital signals.

[0012] Furthermore, after the control chip independently calculates and writes analog and digital signals, it performs differential value complementation before outputting the final pressure value data. The oscillation circuit is used to convert the pressure value data output by the MCU control circuit into frequency conversion data.

[0013] Furthermore, the control chip adopts the M0 architecture.

[0014] Furthermore, the writing simulation signal emitted by the original handwriting transmitting coil is a low-frequency signal of 100kHz-1MHz.

[0015] Furthermore, the original handwriting transmission circuit includes a frequency conversion module, a floating frequency distribution module, and at least one button;

[0016] The button is used to control the working mode of the PCB circuit board, to switch between receiving signal mode and output signal mode;

[0017] The frequency conversion module is used to receive the frequency conversion data transmitted by the oscillation circuit and transmit it to the original handwriting transmitting coil via the floating frequency distribution module.

[0018] Furthermore, the original handwriting emission circuit is equipped with two buttons, each with a frequency matching capacitor, enabling the original handwriting electromagnetic pen to switch to mouse working mode.

[0019] Furthermore, the writing support includes a cylindrical magnetic ring support section located at the front end of the writing support and a connecting section located at the rear end of the writing support. The original handwriting transmitting coil is fitted onto the outer cylindrical surface of the magnetic ring support section. The rear end of the magnetic ring support section is fixedly connected to the front end of the connecting section.

[0020] Furthermore, the connecting section is a cylindrical structure with an outer diameter larger than that of the magnetic ring support section; the front end of the connecting section is provided with an outwardly protruding annular support boss, and the rear end of the connecting section is provided with multiple inwardly recessed limiting grooves.

[0021] Finally, the main body of the PCB circuit board is a PCB board structure. A circular connecting plate is provided at the front end of the PCB circuit board. Multiple outward protruding clips are provided on the edge of the connecting plate. The PCB circuit board is fixedly connected to the magnetic ring support section through the cooperation of multiple clips and multiple limiting slots.

[0022] The beneficial effects of this invention are as follows:

[0023] An electromagnetic pen based on hybrid digital technology for original handwriting is disclosed. It employs a system that synchronously transmits and reports both analog and digital signals. An MCU control circuit synchronously calculates and complements the differences between the two signals, resulting in high-precision data processing. This allows for both original handwriting writing and mouse functionality while reducing costs. The MCU control circuit separately acquires and calculates analog and digital signals, using them as complements to retain useful data and prevent packet loss. Furthermore, the MCU control circuit calculates the waveform time and frequency of the data signals acquired by the ADC analog-to-digital converter, thereby controlling the stability of the ink flow and ensuring clear pen strokes. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the original handwriting electromagnetic pen based on hybrid digital technology according to Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the principle of the original handwriting electromagnetic pen based on hybrid digital technology in Embodiment 1 of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1-2 As shown, this invention provides an original handwriting electromagnetic pen based on hybrid digital technology. The overall design scheme is as follows: when writing or drawing on an electromagnetic screen, drawing board, or electromagnetic-related devices, a hybrid analog signal and digital signal synchronous transmission and reporting system is adopted. The MCU control circuit synchronously calculates the two signals and performs data complementation on the difference values. The MCU control circuit processes the data with high accuracy, enabling the original handwriting writing function as well as mouse function, while reducing cost investment; it also prevents packet leakage, ensures stable ink flow, and produces clear pen strokes.

[0028] The main structure of the original handwriting electromagnetic pen based on hybrid digital technology is a pen body with a writing section at the front and a circuit section at the rear. The writing section realizes the writing function, and the circuit section realizes the reception and conversion of writing signals, and transmits them to an electromagnetic screen, drawing board or other electromagnetic related devices to display the original handwriting or drawing.

[0029] The hybrid digital electromagnetic pen uses a combination of analog and digital signals, with a low-frequency signal ranging from 100kHz to 1MHz. This low-frequency signal is used for close-range touch control, enabling electromagnetic handwriting. When used with the pen's buttons, it can replace a mouse and provides additional shortcut functions. Low-frequency electromagnetic handwriting is achieved through the contact pressure between the pen tip and the screen's glass cover, with an effective distance of 1-30mm from the receiving antenna.

[0030] Hybrid digital electromagnetic pen: The front-end analog signal section consists of the pen tip 1, magnetic ring 2, original handwriting transmitting coil 3, suspended frequency distribution module 61, frequency conversion module 63, and the part up to the back of the two buttons. The back-end digital signal section consists of the oscillation circuit and the MCU control circuit.

[0031] The system consists of two different types of signals: analog and digital. One set of analog signals is directly input into the electromagnetic pen MCU to report frequency detection data, while the other set is a digital signal obtained by the ADC after the analog signal at the front end acquires the voltage change and is then input into the MCU to report data. The data from both sets are independently calculated by the MCU, and the difference values ​​are complemented to obtain the final pressure value data.

[0032] The initial source of the signal is the analog signal generated by the slight movement of the magnetic ring caused by the handwriting pressure of the pen tip when writing or drawing on an electromagnetic screen, drawing board, or other electromagnetic devices. The change in distance between the magnetic ring and the coil during the movement generates a frequency change.

[0033] The coordinate data represents the actual position of the digital pen when writing on the electromagnetic screen, and the pressure data represents the linear ink flow and pen tip data when writing on the electromagnetic screen.

[0034] Hybrid digital electromagnetic pen: Because individual digital signals have the phenomenon of missing data packets during transmission, about 500-1000 data points need to be transmitted per microsecond during writing (the amount of data is related to the resolution). Therefore, it is easy for missing data packets to occur. Hence, a set of analog signal data synchronization is added. The MCU independently and accurately calculates the two signals and then performs comprehensive difference compensation. In this way, users can truly feel the effect of the real original handwriting during actual use.

[0035] The specific structure is as follows:

[0036] The writing unit's specific structure includes a pen tip 1, a magnetic ring 2, a handwriting emission coil 3, and a writing support 4. The magnetic ring 2 is coaxially disposed within the inner cavity of the writing support 4, and the handwriting emission coil 3 is fitted onto the outer surface of the writing support 4. The pen tip 1 is coaxially disposed at the center of the magnetic ring 2 and the writing support 4. The pen tip 1 is used to move and write on the sensor antenna board of an electromagnetic screen, drawing board, or other electromagnetically related device display. The handwriting emission coil 3 is used to emit a writing analog signal according to the content written by the pen tip, specifically, it emits a writing analog signal according to the change in the position and distance of the magnetic ring when the pen tip is writing. The specific structure of the writing unit can follow the conventional structure of electromagnetic pens in the prior art.

[0037] When the pen tip moves to write, it is driven by the writing pressure to move back and forth along the axial straight line, which in turn drives the magnetic ring to move back and forth along the axial straight line. The change in position and distance between the magnetic ring and the original handwriting transmitting coil produces a frequency change, which causes the original handwriting transmitting coil to transmit a signal according to the frequency change, that is, to transmit a writing analog signal according to the content written by the pen tip.

[0038] The original handwriting transmitting coil also receives signals transmitted by the signal coil on the sensor antenna board of an electromagnetic screen, drawing board, or other electromagnetically related device display. The original handwriting electromagnetic pen based on hybrid digital technology, after receiving the signal transmitted by the signal coil on the sensor antenna board within the effective range of the signal coil on the sensor antenna board, transmits real-time coordinate position signals, as well as drawing, writing, pressure, and linear signals to the sensor antenna board.

[0039] The specific structure of the circuit section includes a PCB circuit board 5, a handwriting emission circuit 6, an oscillation circuit 7, an ADC analog-to-digital converter circuit 8, and an MCU control circuit 9. The PCB circuit board 5 is the main supporting structure of the circuit section, and the front end of the PCB circuit board 5 is fixedly connected to the rear end of the writing bracket 4. The handwriting emission circuit 6, the oscillation circuit 7, the ADC analog-to-digital converter circuit 8, and the MCU control circuit 9 are fixedly installed on the PCB circuit board 5 in a front-to-back order. The structure is simple and compact, occupies little space, and has a small size.

[0040] The specific structure of the MCU control circuit 9 consists of a control chip 91, an analog signal module, and a digital signal module. The analog signal module is used to receive the writing analog signal and transmit it to the control chip 91. The ADC analog-to-digital circuit is used to collect the voltage of the writing analog signal, convert it into a digital signal, and input it to the digital signal module of the MCU control circuit. The control chip is used to independently calculate the writing analog signal and digital signal to obtain the final pressure value data, which is then transmitted sequentially through the oscillation circuit, the original handwriting emission circuit, the original handwriting emission coil, the magnetic ring, and the pen tip to the display screen of the electromagnetic screen, drawing board, or other electromagnetically related devices.

[0041] The control chip performs synchronous calculations on analog and digital signals.

[0042] After the control chip independently calculates the analog and digital signals, it performs differential value complementation before outputting the final pressure value data. The oscillation circuit is used to convert the pressure value data output by the MCU control circuit into frequency conversion data.

[0043] The control chip adopts a low-power M0 architecture, eliminating the need for additional control components. The M0 architecture chip boasts high operating efficiency, completing a task in a short time and remaining in sleep mode most of the time, consuming minimal energy and exhibiting excellent energy efficiency. Therefore, the M0 architecture chip in this invention can meet the needs of independently calculating analog and digital signals with a small number of ports. For example, the control chip can connect to analog and digital signal modules via six ports, while each module only requires three ports for connection setup.

[0044] The handwriting transmitting coil emits a low-frequency signal of 100kHz-1MHz. This low-frequency signal is used for close-range touch control, enabling electromagnetic handwriting. When used with the electromagnetic pen buttons, it can replace mouse functionality and provide additional shortcut functions. Low-frequency electromagnetic handwriting is achieved through the contact pressure between the pen tip and the screen's glass cover, with an effective distance of 1-30mm from the receiving antenna.

[0045] Hybrid digital electromagnetic pen: The hybrid system consists of two different types of signals, analog and digital. One set of analog signals is directly input to the electromagnetic pen's MCU to report frequency detection data, while the other set is a digital signal obtained by the ADC after the analog signal at the front end acquires voltage changes and is input to the MCU to report data. The data from both sets are independently calculated by the MCU, and the difference values ​​are complemented to obtain the final pressure value data.

[0046] The initial source of the signal is the analog signal generated by the slight movement of the magnetic ring caused by the handwriting pressure of the pen tip when writing or drawing on an electromagnetic screen, drawing board, or other electromagnetic devices. The change in distance between the magnetic ring and the coil during the movement generates a frequency change.

[0047] The coordinate data represents the actual position of the digital pen when writing on the electromagnetic screen, and the pressure data represents the linear ink flow and pen tip data when writing on the electromagnetic screen.

[0048] Hybrid digital electromagnetic pen: Because individual digital signals have the phenomenon of missing data packets during transmission, about 500-1000 data points need to be transmitted per microsecond during writing (the amount of data is related to the resolution). Therefore, it is easy for missing data packets to occur. Hence, a set of analog signal data synchronization is added. The MCU independently and accurately calculates the two signals and then performs comprehensive difference compensation. In this way, users can truly feel the effect of the real original handwriting during actual use.

[0049] The original handwriting transmission circuit 6 has a specific structure consisting of a floating frequency distribution module 61, a frequency conversion module 63, and at least one button.

[0050] The buttons are used to control the working mode of the PCB circuit board, switching between receiving signal mode and output signal mode;

[0051] The frequency conversion module 63 is used to receive the frequency conversion data transmitted by the oscillation circuit and transmit it to the original handwriting transmitting coil 3 via the floating frequency distribution module 61.

[0052] In actual operation, the original handwriting emission circuit is equipped with two buttons: a first button 62 and a second button 64. Each button is equipped with a frequency matching capacitor, which enables the original handwriting electromagnetic pen to switch to mouse working mode.

[0053] The MCU control circuit separately acquires and calculates analog and digital signals, using them as complements to retain useful signal data, thereby preventing packet loss. The MCU control circuit also calculates the waveform time and frequency of the data signals acquired by the ADC analog-to-digital circuit, thereby controlling the stability of the writing ink and achieving a clear pen stroke.

[0054] The main structure of the frequency converter module consists of multiple capacitors, specifically ten capacitors arranged in a two-row, five-column array. Alternatively, existing frequency converter circuit structures can be directly adopted.

[0055] The main structure of the floating frequency distribution module also consists of multiple capacitors, specifically fifteen capacitors can be arranged; alternatively, the frequency distribution circuit structure in the existing technology can be directly adopted.

[0056] This invention utilizes a suspended frequency distribution module to achieve real-time coordinate positioning of the original handwriting electromagnetic pen within the effective range of the matching sensor antenna board when it is not in contact with the device, based on hybrid digital technology.

[0057] The main structure of an ADC analog-to-digital module consists of a chip and several capacitors and resistors; in particular, the existing ADC analog-to-digital circuit structure can also be directly adopted.

[0058] The main structure of the oscillator circuit consists of several transistors, filter capacitors, filter resistors, and inductors. Alternatively, it can directly adopt existing oscillator circuit structures that include operational amplifiers. The oscillator circuit generates an AC signal with a specific frequency and amplitude.

[0059] After the MCU control circuit independently calculates and writes analog and digital signals to obtain the final pressure value data, it sends the data to the receiving end by opening the port control switch.

[0060] The oscillation circuit generates a signal voltage through relevant components at the tip of the pen, and achieves frequency selection through the output and input terminals of the operational amplifier, feeding back a portion of the output signal to the input terminal to form an oscillation.

[0061] The control chip detects the frequency change of the writing analog signal separately, and then performs calculations. The writing analog signal comes from the analog part of the front end.

[0062] The ADC analog-to-digital converter module uses a NAND gate structure; a NAND gate is a combination of an AND gate and a NOT gate, performing an AND operation first, then a NOT operation. The NAND operation requires two inputs; if both inputs are represented by 0 and 1, the result of the AND operation is the product of those two values.

[0063] The control chip performs frequency detection and control functions. The voltage value is different for each frequency segment. The voltage value is collected and integrated by the ADC and the simulation calculation results are combined and complemented to calculate the final result.

[0064] Furthermore, the specific structural features of each component, their assembly positions, and functional principles are as follows:

[0065] The main structure of the writing bracket 4 consists of a cylindrical magnetic ring support section at the front of the writing bracket and a connecting section at the rear of the writing bracket. The original handwriting transmitting coil 3 is mounted on the outer cylindrical surface of the magnetic ring support section; the rear end of the magnetic ring support section is fixedly connected to the front end of the connecting section.

[0066] Furthermore, the connecting section is a cylindrical structure with an outer diameter larger than that of the magnetic ring support section; an outwardly protruding annular support boss is provided at the front end of the connecting section, and multiple inwardly recessed limiting slots are provided at the rear end of the connecting section.

[0067] Furthermore, the main body of PCB circuit board 5 is a PCB board structure. A circular connecting plate is set at the front end of the PCB circuit board, and multiple outwardly protruding locking blocks are set on the edge of the connecting plate. The PCB circuit board is fixedly connected to the magnetic ring support section through the cooperation of multiple locking blocks and multiple limiting slots. The writing bracket 4 can also be fixedly installed by cooperating with the electromagnetic pen shell through the limiting slots, making the assembly operation convenient.

[0068] This invention is based on a hybrid digital technology original handwriting electromagnetic pen. It is designed to address issues such as packet loss and inconsistent ink flow and unclear pen peaks in existing digital pen transmission systems. It adopts a synchronous transmission and reporting system that combines analog and digital signals. The MCU performs synchronous calculations on the two signals to complement the difference values, thus making the data calculated by the MCU more accurate.

[0069] The hybrid digital electromagnetic digital pen of the present invention can realize the original handwriting writing function;

[0070] The hybrid digital electromagnetic digital pen of this invention can realize mouse functions.

[0071] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A hybrid digital technology based original handwriting electromagnetic pen, characterized by: It includes a pen body, with a writing section at the front and a circuit section at the rear. The writing unit includes a pen tip, a magnetic ring, a handwriting emission coil, and a writing support. The magnetic ring is coaxially disposed in the inner cavity of the writing support, and the handwriting emission coil is fitted onto the outer surface of the writing support. The pen tip is coaxially positioned at the center of the magnetic ring and the writing bracket, and is used to move and write on the sensor antenna board of the display screen; the original handwriting transmission coil is used to transmit writing analog signals according to the content written by the pen tip; The circuit section includes a PCB circuit board, a handwriting emission circuit, an oscillation circuit, an ADC analog-to-digital converter circuit, and an MCU control circuit. The front end of the PCB circuit board is fixedly connected to the rear end of the writing bracket; the original handwriting emission circuit, oscillation circuit, ADC analog-to-digital circuit and MCU control circuit are arranged on the PCB circuit board in a front-to-back order. The MCU control circuit includes a control chip, an analog signal module, and a digital signal module. The analog signal module receives the writing analog signal and transmits it to the control chip. The ADC analog-to-digital converter is used to acquire the voltage of the writing analog signal, convert it into a digital signal, and input it to the digital signal module of the MCU control circuit. The control chip independently calculates the writing analog signal and the digital signal to obtain the final pressure value data, which is then transmitted to the display screen sequentially through the oscillation circuit, the original handwriting emission circuit, the original handwriting emission coil, the magnetic ring, and the pen tip.

2. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 1, characterized in that: The control chip performs synchronous calculations on analog and digital signals.

3. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 2, characterized in that: After the control chip independently calculates and writes analog and digital signals, it performs differential value complementation before outputting the final pressure value data. The oscillation circuit is used to convert the pressure value data output by the MCU control circuit into frequency conversion data.

4. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 3, characterized in that: The control chip uses the M0 architecture.

5. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 4, characterized in that: The writing simulation signal emitted by the original handwriting transmitting coil is a low-frequency signal of 100kHz-1MHz.

6. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 1, characterized in that: The original handwriting transmission circuit includes a frequency conversion module, a floating frequency distribution module, and at least one button; The button is used to control the working mode of the PCB circuit board, to switch between receiving signal mode and output signal mode; The frequency conversion module is used to receive the frequency conversion data transmitted by the oscillation circuit and transmit it to the original handwriting transmitting coil via the floating frequency distribution module.

7. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 1, characterized in that: The original handwriting emission circuit is equipped with two buttons, each with a frequency matching capacitor, which enables the original handwriting electromagnetic pen to switch to mouse working mode.

8. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 7, characterized in that: The writing stand includes a cylindrical magnetic ring support section at the front of the writing stand and a connecting section at the rear of the writing stand. The original handwriting emission coil is fitted onto the outer cylindrical surface of the magnetic ring support section. The rear end of the magnetic ring support section is fixedly connected to the front end of the connecting section.

9. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 8, characterized in that: The connecting section is a cylindrical structure with an outer diameter larger than that of the magnetic ring support section; the front end of the connecting section is provided with an outwardly protruding annular support boss, and the rear end of the connecting section is provided with multiple inwardly recessed limiting grooves.

10. The original handwriting electromagnetic pen based on hybrid digital technology according to claim 1, characterized in that: The main body of the PCB circuit board is a PCB board structure. A circular connecting plate is provided at the front end of the PCB circuit board. Multiple outward protruding clips are provided on the edge of the connecting plate. The PCB circuit board is fixedly connected to the magnetic ring support section through the cooperation of multiple clips and multiple limiting slots.

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