Electronic pen and electronic device
By setting up an analog front-end module in the electronic pen to amplify the voltage signal of the piezoelectric ceramic component, the problem of recognition difficulties caused by small voltage signals in the existing technology is solved, thereby improving the accuracy and functional versatility of the electronic pen.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN XINWEI INTELLIGENT TECH CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-08-04
AI Technical Summary
The voltage signal output by the piezoelectric ceramic component in existing electronic pens is relatively small, which causes the control module to be unable to accurately identify it, affecting the accuracy of use.
An analog front-end module is set up in the electronic pen to amplify the voltage signal detected by the piezoelectric ceramic component and output it to the control module. The drive module then drives the piezoelectric ceramic component to work.
It improves the accuracy of electronic pen use, enables accurate identification and control of voltage signals from piezoelectric ceramic components, and enhances the switching of writing modes and vibration feedback functions.
Smart Images
Figure CN224595091U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic pen technology, and in particular to an electronic pen and electronic device. Background Technology
[0002] With the continuous improvement of electronic pen structure, some electronic pens have begun to incorporate piezoelectric ceramic components. These components have pressure sensing capabilities. When a user uses the electronic pen, the piezoelectric ceramic components can detect changes in the pressure applied by the user's hand while holding the pen. Based on the piezoelectric effect, the piezoelectric ceramic components generate an electric charge, forming a voltage signal.
[0003] However, due to the small deformation of the pen shell, the pressure signal detected by the piezoelectric ceramic component is usually quite weak, and the resulting voltage signal may be in the millivolt range. This causes the control module to be unable to accurately identify the voltage signal of the piezoelectric ceramic component, affecting the accuracy of the electronic pen. Utility Model Content
[0004] In view of this, this application provides an electronic pen and an electronic device to at least solve the problem that the voltage signal value output by the piezoelectric ceramic component in the prior art electronic pen is small, which affects the accuracy of the electronic pen.
[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:
[0006] This application provides an electronic pen, including a pen shell, a piezoelectric ceramic component, an analog front-end module, a control module, and a drive module, wherein the piezoelectric ceramic component is connected to the pen shell;
[0007] The pen shell has a receiving cavity, and the analog front-end module, the control module, and the drive module are all disposed within the receiving cavity; the input terminal of the analog front-end module is electrically connected to the piezoelectric ceramic component, and the output terminal of the analog front-end module is electrically connected to the control module; the input terminal of the drive module is electrically connected to the control module, and the output terminal of the drive module is electrically connected to the piezoelectric ceramic component.
[0008] The piezoelectric ceramic component is used to detect the user's operating pressure on the pen shell and generate a first voltage signal; the analog front-end module is used to amplify the first voltage signal to generate a second voltage signal and output the second voltage signal to the control module; the control module is used to control the drive module to drive the piezoelectric ceramic component to work according to the second voltage signal.
[0009] Optionally, the electronic pen further includes a control switch disposed within the receiving cavity; the control switch is connected between the analog front-end module and the piezoelectric ceramic component, and the control switch is used to control the conduction or disconnection of the circuit between the analog front-end module and the piezoelectric ceramic component.
[0010] Optionally, the analog front-end module is integrated inside the control module; or, the analog front-end module is independent of the control module but external to it and electrically connected to the control module.
[0011] Optionally, the control module is used to detect the on / off state of the control switch, and output a first signal or a second signal to the drive module when the control switch is off; the drive module is used to drive the piezoelectric ceramic component to vibrate when the first signal is received, and the drive module is used to drive the piezoelectric ceramic component to produce sound when the second signal is received.
[0012] Optionally, the electronic pen further includes: a wireless communication module disposed within the receiving cavity; the wireless communication module being electrically connected to the control module; the wireless communication module being used to receive instructions and send the instructions to the control module; and the control module being used to output the second signal to the driving module upon receiving the instructions.
[0013] Optionally, the piezoelectric ceramic component is disposed within the receiving cavity; or, the piezoelectric ceramic component is disposed outside the receiving cavity and connected to the pen shell.
[0014] Optionally, the pen shell has a gripping area, and the piezoelectric ceramic component is provided corresponding to the gripping area.
[0015] Optionally, the pen shell corresponding to the gripping area is made of a soft material; or, the thickness of the pen shell corresponding to the gripping area is less than the thickness of other parts of the pen shell.
[0016] Optionally, the piezoelectric ceramic component has a multi-layer structure.
[0017] This application also provides an electronic device, including the electronic pen described in any of the foregoing claims.
[0018] Compared with existing technologies, the electronic pen and electronic device described in this application have the following advantages:
[0019] The electronic pen of this application has an analog front-end module between the piezoelectric ceramic component and the control module. The input end of the analog front-end module is electrically connected to the piezoelectric ceramic component, and the output end of the analog front-end module is electrically connected to the control module. The analog front-end module can amplify the first voltage signal detected by the piezoelectric ceramic component to generate a second voltage signal, and output the second voltage signal to the control module, thereby helping the control module to accurately identify the second voltage signal and improving the accuracy of the electronic pen.
[0020] The electronic device of this application has the same or similar advantages as the prior art and the aforementioned electronic pen, which will not be repeated here. Attached Figure Description
[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:
[0022] Figure 1 This is one of the hardware composition diagrams of the electronic pen in the embodiments of this application;
[0023] Figure 2 This is the second schematic diagram of the hardware composition of the electronic pen in the embodiments of this application;
[0024] Figure 3 This is a circuit diagram of the electronic pen in an embodiment of this application.
[0025] Explanation of reference numerals in the attached figures:
[0026] 10. Pen casing; 20. Pen nib;
[0027] 11. Piezoelectric ceramic component; 12. Analog front-end module; 13. Control module; 14. Drive module; 15. Control switch; 16. Wireless communication module; 17. Boost module; 18. Marking module. 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, 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] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.
[0030] The term "comprising" or any other variations thereof in the specification and claims of this application is intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal device 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 terminal device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.
[0031] The following detailed description of an electronic pen and electronic device provided in this application is provided through specific embodiments.
[0032] Electronic pens or smart pens are typically used in conjunction with touchscreen electronic devices to perform selection, writing, or drawing functions on the touchscreen. With continuous improvements in the structure of electronic pens, some pens have begun to incorporate piezoelectric ceramic components. These components are usually composed of a piezoelectric ceramic dielectric material placed between two circular copper electrodes. Piezoelectric ceramic components exhibit the piezoelectric effect, including direct and inverse piezoelectric effects. The direct piezoelectric effect refers to the generation of an electric charge when an external force is applied to the piezoelectric ceramic component. The inverse piezoelectric effect refers to the mechanical deformation that occurs when an electric field is applied to the piezoelectric ceramic component, with the degree of deformation being directly proportional to the electric field strength.
[0033] The use of piezoelectric ceramic components in electronic pens enables pressure sensing. When a user grips the pen, the piezoelectric ceramic component detects changes in pressure from the user's hand. Based on the piezoelectric effect, the component generates an electric charge, forming a voltage signal. The greater the pressure, the more charge is generated, and the larger the voltage signal. However, because the pen shell deformation is typically small, the pressure signal detected by the piezoelectric ceramic component is usually weak, resulting in a low voltage signal value, typically around 10mV to 500mV. Voltage signals within this range cannot be accurately recognized by the control module, thus preventing the control module from generating corresponding actions and affecting the accuracy of the electronic pen's use.
[0034] The electronic pens described in the following embodiments of this application include an analog front end (AFE) module. The analog front end module is electrically connected to the piezoelectric ceramic component and the control module, respectively. The analog front end module can amplify the voltage signal detected by the piezoelectric ceramic component and output it to the control module, thereby helping the control module to accurately identify the voltage signal generated by the piezoelectric ceramic component and improving the accuracy of the electronic pen.
[0035] Figure 1 This illustration shows one of the hardware configuration diagrams of the electronic pen in an embodiment of this application. (Refer to...) Figure 1 The electronic pen in this embodiment includes a pen shell 10, a piezoelectric ceramic component 11, an analog front-end module 12, a control module 13, and a drive module 14.
[0036] The piezoelectric ceramic component 11 can be a layered structure, or it can be a block, columnar, or other structural form; the specific type is not limited in this embodiment. The piezoelectric ceramic component 11 is connected to the pen shell 10. The connection between the piezoelectric ceramic component 11 and the pen shell 10 can be achieved through any method such as snap-fit, adhesive bonding, assembly, or welding; the specific connection method is not limited in this embodiment. The piezoelectric ceramic component 11 is used to detect the user's operating pressure on the pen shell 10. The user's operating pressure on the pen shell 10 will cause the piezoelectric ceramic component 11 to deform, thereby generating an electric charge and forming a first voltage signal.
[0037] The pen shell 10 has a receiving cavity, in which the analog front-end module 12, control module 13 and drive module 14 are all located. Some brackets, mounting bases and other components for support and fixation can be set in the receiving cavity, and the analog front-end module 12, control module 13 and drive module 14 are fixed in the receiving cavity through these components.
[0038] The input terminal of the analog front-end module 12 is electrically connected to the piezoelectric ceramic component 11, and the output terminal of the analog front-end module 12 is electrically connected to the control module 13. The analog front-end module 12 can amplify the first voltage signal generated by the piezoelectric ceramic component 11 to generate a second voltage signal, and output the second voltage signal to the control module 13. For example, the analog front-end module 12 can amplify the voltage signal generated by the piezoelectric ceramic component 11 in the range of 10mV to 500mV to the range of 1V to 5V, and then output the amplified voltage signal to the control module 13 so that the control module 13 can accurately identify the voltage signal.
[0039] The analog front-end module 12 includes an amplifier that amplifies a small-range voltage signal to a range recognizable by the control module 13. The analog front-end module 12 also includes a filter to remove noise and interference from the voltage signal, retaining the valid signal and thus improving the signal-to-noise ratio. The analog front-end module 12 further includes an analog-to-digital converter (ADC) that converts the amplified and filtered analog signal into a digital signal recognizable by the control module 13, facilitating further processing and analysis by the control module 13. For example, this embodiment may employ a 12-bit resolution ADC with a reference voltage of 2V and a minimum resolvable voltage of 0.5mV, thereby effectively recognizing the pressure signal detected by the piezoelectric ceramic component 11.
[0040] The input terminal of the drive module 14 is electrically connected to the control module 13, and the output terminal of the drive module 14 is electrically connected to the piezoelectric ceramic component 11. The drive module 14 can convert the low-power signal output by the control module 13 into a high-voltage drive signal, thereby driving the piezoelectric ceramic component 11 to work. In other words, the control module 13 can control the drive module 14 to drive the piezoelectric ceramic component 11 to work.
[0041] Therefore, the electronic pen of this embodiment incorporates an analog front-end module 12, a control module 13, and a drive module 14 within the housing cavity of the pen casing 10. The input terminal of the analog front-end module 12 is electrically connected to the piezoelectric ceramic component 11, and its output terminal is electrically connected to the control module 13. The analog front-end module 12 amplifies the first voltage signal generated by the piezoelectric ceramic component 11 to generate a second voltage signal, and outputs the second voltage signal to the control module 13. The input terminal of the drive module 14 is electrically connected to the control module 13, and its output terminal is electrically connected to the piezoelectric ceramic component 11. The control module 13 controls the drive module 14 to drive the piezoelectric ceramic component 11 to operate based on the second voltage signal. Since the analog front-end module 12 amplifies the first voltage signal detected by the piezoelectric ceramic component 11 to form a second voltage signal, which is then output to the control module 13, the control module 13 can accurately identify the second voltage signal and control the drive module 14 to drive the piezoelectric ceramic component 11 based on the second voltage signal. This effectively improves the accuracy of the electronic pen.
[0042] It should be noted that the piezoelectric ceramic component 11, analog front-end module 12, control module 13 and drive module 14 in this application can be independent electronic units that can form their own systems. They are composed of multiple circuits or components and can provide specific interfaces to the outside world to realize corresponding functions. The realization of their functions is determined by the characteristics of the electronic components and circuits included in each module. This application does not focus on the implementation method of each module's functions and does not involve the improvement of the method.
[0043] For example, in the embodiments of this application, the analog front-end module 12 can be a CDS1883 chip, the control module 13 can be an HC32L110 chip, the drive module 14 can be a DRV2667 chip, and the control switch 15 can be an APL0501A model.
[0044] The electronic pen in this embodiment also includes a pen tip 20 connected to the pen shell 10. The pen tip 20 contains electrodes, and the control module 13 is electrically connected to the electrodes. The electrodes have good conductivity and can be made of metal materials such as copper, copper alloys, or stainless steel. The electrodes are electrically connected to the control module 13, enabling the transmission of electrical signals generated by the control module 13 to the pen tip 20. The pen tip is used for interaction with the touchscreen of the electronic device, realizing the electronic pen's selection, writing, or drawing functions.
[0045] The pen tip 20 has multiple writing modes, such as fine pen writing mode, normal writing mode, and thick pen writing mode. If the projection diameter of the pen tip on the touch screen is thin, it corresponds to fine pen writing mode; if the projection diameter is moderate, it corresponds to normal writing mode; and if the projection diameter is thick, it corresponds to thick pen writing mode. For example, if the projection diameter of the pen tip on the touch screen is 0.3mm, the pen tip 20 is in fine pen writing mode, producing thinner lines; if the projection diameter is 0.5mm, the pen tip 20 is in normal writing mode, producing lines more suitable for everyday writing; and if the projection diameter is 0.7mm, the pen tip 20 is in thick pen writing mode, producing thicker lines.
[0046] Figure 2 This is shown as a second schematic diagram of the hardware composition of the electronic pen in an embodiment of this application, with reference to... Figure 2 The pen casing 10 is equipped with a wireless communication module 16, such as a Bluetooth module. The wireless communication module 16 enables wireless signal transmission between the electronic pen and the touch screen, thereby controlling the projection diameter of the pen tip on the touch screen according to the first voltage signal generated by the piezoelectric ceramic component 11, so as to achieve the switching of different writing modes.
[0047] The second voltage signal output from the analog front-end module 12 to the control module 13 is determined by the first voltage signal value of the piezoelectric ceramic component 11. The first voltage signal value of the piezoelectric ceramic component 11 is positively correlated with the operating pressure value of the user on the pen shell 10 detected by the piezoelectric ceramic component 11. That is, the greater the operating pressure value of the user on the pen shell 10 detected by the piezoelectric ceramic component 11, the greater the value of the first voltage signal generated by the piezoelectric ceramic component 11, and the greater the value of the second voltage signal output from the analog front-end module 12 to the control module 13. Thus, the control module 13 can control the pen tip 20 to be in different writing modes according to the value of the second voltage signal obtained, so as to adapt to different operating pressures.
[0048] In some embodiments of this application, when the second voltage signal output from the analog front-end module 12 to the control module 13 is within a first threshold range, the control module 13 controls the pen tip 20 to be in fine pen writing mode; when the second voltage signal output from the analog front-end module 12 to the control module 13 is within a second threshold range, the control module 13 controls the pen tip 20 to be in normal writing mode; and when the second voltage signal output from the analog front-end module 12 to the control module 13 is within a third threshold range, the control module 13 controls the pen tip 20 to be in thick pen writing mode.
[0049] The first, second, and third threshold ranges can be set according to requirements. For example, the first threshold range can be set to be smaller than the second threshold range, and the second threshold range can be set to be smaller than the third threshold range. For instance, the first threshold range could be 1V to 2V, the second threshold range could be 2V to 3V, and the third threshold range could be 3V to 5V. Of course, the specific ranges can be flexibly set according to requirements. This means that when the piezoelectric ceramic component 11 detects a small amount of pressure applied by the user to the pen shell 10 (e.g., a light press), the pen tip 20 is in fine-pen writing mode. When the piezoelectric ceramic component 11 detects a relatively large amount of pressure applied by the user to the pen shell 10 (e.g., a slight press), the pen tip 20 is in normal writing mode. When the piezoelectric ceramic component 11 detects an even larger amount of pressure applied by the user to the pen shell 10 (e.g., a heavy press), the pen tip 20 is in thick-pen writing mode.
[0050] Therefore, the electronic pen of this embodiment can have three modes. When pressed lightly, the control module 13 controls the diameter of the projection of the pen tip on the touch screen to be 0.3mm, so that the pen tip 20 is in fine pen writing mode. When pressed slightly, the control module 13 controls the diameter of the projection of the pen tip on the touch screen to be 0.5mm, so that the pen tip 20 is in fine pen normal writing mode. When pressed heavily, the control module 13 controls the diameter of the projection of the pen tip on the touch screen to be 0.7mm, so that the pen tip 20 is in thick pen writing mode.
[0051] In this way, users can switch between 20 different pen tip thicknesses based on the different pressures applied when holding the electronic pen, without having to perform operations on the corresponding touchscreen. Compared with existing technologies, this helps to enrich the usage modes of the electronic pen and increases the real-time nature and convenience of user operations.
[0052] It should be noted that the writing mode of the pen tip 20 in this embodiment can also be applied when the pen tip 20 performs the drawing function. Thus, the fine pen writing mode can correspond to the outlining of fine lines, the normal writing mode can correspond to the outlining of relatively thick and thin lines, and the thick pen writing mode can correspond to the outlining of even thicker lines.
[0053] Optionally, in some embodiments of this application, the analog front-end module 12 can be integrated into the control module 13. This helps to improve the integrated design of the electronic pen's internal components, thereby saving the space occupied by the analog front-end module 12 and the control module 13 in the cavity, and facilitating the installation and layout of other components.
[0054] Alternatively, the analog front-end module 12 can be independent of the control module 13. That is, the analog front-end module 12 and the control module 13 are two independent components, and the analog front-end module 12 is electrically connected to the control module 13 through pins. This helps to reduce the manufacturing difficulty of the control module 13 and reduce the probability of signal interference.
[0055] Both of the above methods can achieve effective signal transmission between the analog front-end module 12 and the control module 13, and the specific settings can be flexibly configured according to actual needs.
[0056] Reference Figure 2 In some embodiments of this application, the electronic pen further includes: a control switch 15, which is disposed in the receiving cavity of the pen shell 10; the control switch 15 is connected between the analog front-end module 12 and the piezoelectric ceramic component 11, and the control switch 15 is used to control the conduction or disconnection of the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11.
[0057] The control switch 15 can be an electronic switch such as a field-effect transistor or a micro switch. The control switch 15 can realize the conduction or disconnection of the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11 by its own on / off state. In other words, when the control switch 15 is on, the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11 is on, and when the control switch 15 is off, the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11 is disconnected.
[0058] When the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11 is connected, the analog front-end module 12 acquires the first voltage signal generated by the piezoelectric ceramic component 11, amplifies the first voltage signal to form a second voltage signal, and outputs it to the control module 13. When the circuit between the analog front-end module 12 and the piezoelectric ceramic component 11 is disconnected, the analog front-end module 12 cannot acquire the first voltage signal generated by the piezoelectric ceramic component 11. At this time, the piezoelectric ceramic component 11 can not be used to perform the function of detecting the user's operating pressure on the pen shell 10, but can be used to perform other functions such as vibration and sound generation.
[0059] Of course, in some other embodiments of this application, no control switch 15 is provided between the analog front-end module 12 and the piezoelectric ceramic component 11. The control module 13 itself can choose whether to acquire the second voltage signal amplified by the analog front-end module 12. For example, when the piezoelectric ceramic component 11 needs to perform the function of detecting the user's operating pressure on the pen shell 10, the second voltage signal amplified by the analog front-end module 12 is acquired. When the piezoelectric ceramic component 11 needs to perform other functions such as vibration and sound generation, the second voltage signal amplified by the analog front-end module 12 is not acquired.
[0060] Furthermore, in some embodiments of this application, the control module 13 is used to detect the on / off state of the control switch 15, and outputs a first signal or a second signal to the drive module 14 when the control switch 15 is off; the drive module 14 is used to drive the piezoelectric ceramic element 11 to vibrate when the first signal is received, and the drive module 14 is used to drive the piezoelectric ceramic element 11 to emit sound when the second signal is received.
[0061] Specifically, the piezoelectric ceramic component 11 exhibits the inverse piezoelectric effect. When an alternating electric field is applied to both ends of the piezoelectric ceramic component 11, it undergoes periodic expansion and contraction deformation along the direction of the electric field, thereby inducing vibration. If the vibration frequency is within the sound wave range (20Hz~20kHz), it will push the air to generate sound waves, thus causing the piezoelectric ceramic component 11 to produce sound. In conjunction with the aforementioned embodiment, when the control switch 15 is off, the piezoelectric ceramic component 11 is used to perform other functions such as vibration and sound generation.
[0062] Therefore, when the control switch 15 is off, the control module 13 can output a first signal or a second signal to the drive module 14. The first signal can be an alternating voltage signal, and the second signal can be a high-frequency signal. When the drive module 14 receives the first signal, it drives the piezoelectric ceramic element 11 to vibrate; when it receives the second signal, it drives the piezoelectric ceramic element 11 to emit sound. The vibration of the piezoelectric ceramic element 11 enables the electronic pen to simulate the vibration feedback of writing with a real pen, providing users with a vibrational feel closer to that of real handwriting. The sound emitted by the piezoelectric ceramic element 11 helps users locate the electronic pen, enabling a locator function and effectively reducing the probability of losing the electronic pen.
[0063] Therefore, the electronic pen in this embodiment can not only use the pressure detection of the piezoelectric ceramic component 11 to realize the switching function of different writing modes of the pen tip 20, but also use the vibration of the piezoelectric ceramic component 11 to make the electronic pen have the vibration feedback function that simulates the writing of a real pen, providing users with a vibration feel that is closer to real handwriting, but also use the sound of the piezoelectric ceramic component 11 to realize the electronic pen's locating function.
[0064] Furthermore, refer to Figure 2 In some embodiments of this application, the electronic pen further includes: a wireless communication module 16, which is disposed in the receiving cavity of the pen shell 10; the wireless communication module 16 is electrically connected to the control module 13; the wireless communication module 16 is used to receive instructions and send the instructions to the control module 13; the control module 13 is used to output a second signal to the drive module 14 when the instructions are received.
[0065] The wireless communication module 16 can be a Bluetooth module, Wi-Fi module, ZigBee module, etc. The wireless communication module 16 is equipped to enable data communication between the electronic pen and external mobile devices, such as mobile phones, electronic watches, tablets, etc. The wireless communication module 16 is electrically connected to the control module 13. The wireless communication module 16 can send the acquired instructions to the control module 13. The instructions received by the wireless communication module 16 can be user operation instructions for external mobile devices or user operation instructions for touch screens. All of the above operation instructions can be acquired by the wireless communication module 16 and then sent to the control module 13.
[0066] Upon receiving an instruction, the control module 13 outputs a second signal to the drive module 14, specifically a high-frequency signal, causing the drive module 14 to drive the piezoelectric ceramic element 11 to emit sound. In conjunction with the aforementioned embodiment, this is equivalent to the control module 13 outputting a high-frequency signal to the drive module upon detecting that the control switch 15 is open and upon receiving an instruction, causing the drive module 14 to drive the piezoelectric ceramic element 11 to emit sound. Here, the instruction refers to the command sent by the user to the electronic pen via a mobile device, and the high-frequency signal refers to a signal with a relatively high frequency. Since the range of sound frequencies audible to the human ear is typically 20Hz to 20kHz, if it is necessary for the piezoelectric ceramic element 11 to emit audible sound, the high-frequency signal driving the piezoelectric ceramic element 11 can be set to fall within this range.
[0067] For example, if a user needs to find the electronic pen, they can send a search command to the pen via a mobile device such as a smartphone. The wireless communication module 16 can receive the search command and send it to the control module 13. Upon receiving the command, the control module 13 can output a high-frequency signal to the drive module 14, causing the drive module 14 to drive the piezoelectric ceramic component 11 to emit sound. Thus, this embodiment utilizes the principle that the piezoelectric ceramic component 11 can emit sound under high-frequency signals, making it convenient for users to locate the electronic pen, realizing the electronic pen search function, and effectively reducing the probability of losing the electronic pen.
[0068] Reference Figure 2 In some embodiments of this application, the cavity is further provided with a boost module 17 and a coding module 18; the boost module 17 is electrically connected to the drive module 14 and the coding module 18 respectively, and the boost module 17 is used to output high voltage to the drive module 14 and the coding module 18.
[0069] The input terminal of the boost module 17 is electrically connected to the power supply, and the output terminal of the boost module 17 is electrically connected to the drive module 14 and the coding module 18, respectively. The main function of the boost module 17 is to boost the lower input voltage to a higher voltage suitable for the operation of specific functional modules within the electronic pen. For example, the electronic pen typically includes a coding module 18 for generating and transmitting coding signals, enabling communication and interaction between the electronic pen and the touchscreen. The coding module 18 requires a higher voltage environment to operate; therefore, the output terminal of the boost module 17 is electrically connected to the coding module 18 to provide high voltage for its normal operation.
[0070] In addition, the piezoelectric ceramic component 11 typically requires operation under high voltage conditions. Therefore, the output terminal of the boost module 17 is also electrically connected to the piezoelectric ceramic component 11 to provide high voltage for its normal operation. This allows the piezoelectric ceramic component 11 to reuse the boost module 17 within the electronic pen, eliminating the need for a separate boost module for it. This helps reduce the number of electronic components within the electronic pen's housing and controls the pen's manufacturing cost.
[0071] Figure 3 The circuit diagram of the electronic pen in the embodiment of this application is shown, with reference to Figure 3 The electronic pen includes a piezoelectric ceramic component 11, an analog front-end module 12, a control module 13, a drive module 14, a control switch 15, a boost module 17, and a coding module 18.
[0072] Analog front-end module 12 has an AIN (Analog Input) pin, such as... Figure 3 As shown in the diagram, the AIN1 and AIN0 pins are electrically connected to the piezoelectric ceramic component 11. One of the AIN1 and AIN0 pins corresponds to the positive terminal of the piezoelectric ceramic component 11, and the other corresponds to the negative terminal of the piezoelectric ceramic component 11. The AIN1 and AIN0 pins of the analog front-end module 12 serve as the input terminals of the analog front-end module 12, used to receive voltage or current signals from other analog devices.
[0073] Both the analog front-end module 12 and the control module 13 have RX (Receive) pins and TX (Transmit) pins. The RX pin typically acts as a signal receiver, used to receive data from other devices, while the TX pin typically acts as a signal transmitter, used to convert the digital signals within the module into electrical signals and send them to other devices. The RX pin of the analog front-end module 12 is electrically connected to the TX pin of the control module 13, and vice versa.
[0074] The RST (Reset) pin, INT (Interrupt) pin, SCL (Serial Clock Line) pin, and SDA (Serial Data Line) pin of the drive module 14 are electrically connected to the corresponding pins of the control module 13 for signal input. The RST pin is primarily used to reset the relevant module. The INT pin is primarily used to send interrupt request signals to the relevant module. The SCL pin is primarily used to transmit clock signals in the I2C (Inter-Integrated Circuit) communication protocol. The SDA pin is primarily used to transmit data signals in the I2C communication protocol. The OUT+ (Positive haptic diver differential output) pin and OUT- (Negative haptic diver differential output) pin of the drive module 14 are electrically connected to the piezoelectric ceramic component 11. The OUT+ pin corresponds to the positive terminal of the piezoelectric ceramic component 11, and the OUT- pin corresponds to the negative terminal of the piezoelectric ceramic component 11.
[0075] Control switch 15 is connected between analog front-end module 12 and piezoelectric ceramic component 11. Figure 3 The diagram shows two control switches 15, which are connected to the positive and negative terminals of the piezoelectric ceramic element 11, respectively. The control module 13 has two pins, PA1 and PA2, which are electrically connected to the two control modules 13 and used to control the on / off state of the control modules 13.
[0076] The output of boost module 17 is electrically connected to the VDD pin of drive module 14 to provide high voltage to drive module 14. The VDD pin of each module is typically a logic high-level power supply voltage, providing the positive voltage required for module operation. The GND pin of each module is called ground and is usually connected to the negative terminal of the power module or battery, serving as a grounding point.
[0077] Optionally, in some embodiments of this application, the piezoelectric ceramic component 11 is disposed within the receiving cavity of the pen shell 10. The main component of the pen shell 10 is the housing, which forms the receiving cavity. The piezoelectric ceramic component 11 is disposed within the receiving cavity, meaning that the piezoelectric ceramic component 11 is not visually apparent from the pen shell 10. In this manner, the housing of the pen shell 10 provides better protection for the piezoelectric ceramic component 11, helping to extend its service life.
[0078] Alternatively, in some other embodiments of this application, the piezoelectric ceramic component 11 is disposed outside the receiving cavity and connected to the pen shell 10. The piezoelectric ceramic component 11 can be connected to the pen shell 10 by adhesive bonding, snap-fitting, or other methods. For example, the pen shell 10 can have a slot adapted to the structural shape of the piezoelectric ceramic component 11, which holds the piezoelectric ceramic component 11 in place. The slot limits the position of the piezoelectric ceramic component 11, helping to improve the installation stability of the piezoelectric ceramic component 11. This arrangement helps to improve the sensitivity of the piezoelectric ceramic component 11 to user-operated pressure detection.
[0079] Alternatively, in some other embodiments of this application, the piezoelectric ceramic component 11 can be directly embedded into the pen housing 10. Specifically, the pen housing 10 is typically manufactured by injection molding. During the injection molding process of the pen housing 10, the piezoelectric ceramic component 11 can be directly encapsulated within the pen housing 10. This eliminates the need for subsequent installation steps of the piezoelectric ceramic component 11, simplifies the manufacturing of the electronic pen, and effectively ensures the installation stability of the piezoelectric ceramic component 11 on the pen housing 10.
[0080] Optionally, in some embodiments of this application, the pen shell 10 is provided with a gripping area, and the piezoelectric ceramic component 11 is disposed corresponding to the gripping area. Typically, the gripping area of the pen shell 10 is located near the pen tip 20, allowing the piezoelectric ceramic component 11 to be disposed corresponding to the gripping area. When the user holds the pen to write, pressure can be directly applied to the piezoelectric ceramic component 11, enabling it to provide more precise switching of writing modes and vibration feedback. Of course, the position of the gripping area may differ for different users, and therefore the gripping area can be freely set according to the user's usage habits; this embodiment does not impose any limitations on this.
[0081] It should be noted that, in conjunction with the aforementioned embodiments, regardless of whether the piezoelectric ceramic component 11 is disposed inside or outside the receiving cavity, the piezoelectric ceramic component 11 can be disposed corresponding to the gripping area of the pen shell 10.
[0082] Optionally, based on the above embodiments, the pen shell 10 corresponding to the grip area is made of a soft material. For example, the pen shell 10 corresponding to the grip area can be made of elastic polymer, rubber, or other materials. This setting can enhance the pressure transmission effect of the grip area, enhance the sensitivity of the piezoelectric ceramic component 11, increase the deformation and signal strength of the piezoelectric ceramic component 11, and at the same time help optimize the structure of the pen shell 10 and improve the writing feel.
[0083] Alternatively, the thickness of the pen shell 10 corresponding to the grip area can be less than the thickness of other parts of the pen shell 10. For example, the thickness of the pen shell 10 corresponding to the grip area can be about 1mm to 3mm less than the thickness of other parts of the pen shell 10. This setting can also enhance the pressure transmission effect of the grip area, enhance the sensitivity of the piezoelectric ceramic component 11, and improve the deformation and signal strength of the piezoelectric ceramic component 11.
[0084] Optionally, in some embodiments of this application, the piezoelectric ceramic element 11 has a multi-layer structure. The multi-layer structure increases the effective working area of the piezoelectric ceramic element 11, allowing for a larger displacement under the same driving voltage compared to a single-layer piezoelectric ceramic element 11, thereby improving the detection sensitivity of the piezoelectric ceramic element 11. Simultaneously, the multi-layer structure can disperse stress when the piezoelectric ceramic element 11 is subjected to external forces, reducing the pressure borne by individual layers and thus reducing the risk of breakage due to stress concentration.
[0085] This application also provides an electronic device, which includes the electronic pen of any of the foregoing embodiments. In addition to the electronic pen, the electronic device also includes a touchscreen for use with the electronic pen, such as a tablet computer, touchscreen phone, smart screen, or learning machine. The electronic pen can perform selection, writing, or drawing functions on the touchscreen, realizing interaction between the electronic pen and the touchscreen. Based on the advantages of the electronic pen described in the foregoing embodiments, the accuracy and user experience of the electronic device's interaction can be improved.
[0086] It should be understood that the phrase "some embodiments" throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.
[0087] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An electronic pen, characterized by It includes a pen shell (10), a piezoelectric ceramic component (11), an analog front-end module (12), a control module (13), and a drive module (14), wherein the piezoelectric ceramic component (11) is connected to the pen shell (10); The pen shell (10) has a receiving cavity, and the analog front-end module (12), the control module (13) and the drive module (14) are all located in the receiving cavity; The input terminal of the analog front-end module (12) is electrically connected to the piezoelectric ceramic component (11), and the output terminal of the analog front-end module (12) is electrically connected to the control module (13); the input terminal of the drive module (14) is electrically connected to the control module (13), and the output terminal of the drive module (14) is electrically connected to the piezoelectric ceramic component (11); The piezoelectric ceramic component (11) is used to detect the user's operating pressure on the pen shell (10) and generate a first voltage signal; the analog front-end module (12) is used to amplify the first voltage signal to generate a second voltage signal and output the second voltage signal to the control module (13); the control module (13) is used to control the drive module (14) to drive the piezoelectric ceramic component (11) to work according to the second voltage signal.
2. The electronic pen according to claim 1, characterized by The electronic pen also includes a control switch (15), which is located inside the receiving cavity; The control switch (15) is connected between the analog front-end module (12) and the piezoelectric ceramic component (11). The control switch (15) is used to control the conduction or disconnection of the circuit between the analog front-end module (12) and the piezoelectric ceramic component (11).
3. The electronic pen according to claim 1, wherein The analog front-end module (12) is integrated inside the control module (13); or, the analog front-end module (12) is independent of the control module (13) and external, and is electrically connected to the control module (13).
4. The electronic pen according to claim 2, wherein The control module (13) is used to detect the on / off state of the control switch (15) and output a first signal or a second signal to the drive module (14) when the control switch (15) is off. The drive module (14) is used to drive the piezoelectric ceramic component (11) to vibrate when the first signal is received, and the drive module (14) is used to drive the piezoelectric ceramic component (11) to produce sound when the second signal is received.
5. The electronic pen according to claim 4, wherein The electronic pen also includes a wireless communication module (16), which is disposed within the receiving cavity; The wireless communication module (16) is electrically connected to the control module (13); the wireless communication module (16) is used to receive instructions and send the instructions to the control module (13). The control module (13) is used to output the second signal to the drive module (14) upon receiving the instruction.
6. The electronic pen according to any one of claims 1 to 5, characterized in that, The piezoelectric ceramic component (11) is disposed inside the receiving cavity; or, the piezoelectric ceramic component (11) is disposed outside the receiving cavity and connected to the pen shell (10).
7. The electronic pen according to claim 6, wherein The pen shell (10) has a gripping area, and the piezoelectric ceramic component (11) is provided corresponding to the gripping area.
8. The electronic pen according to claim 7, characterized by The pen shell (10) corresponding to the gripping area is made of a soft material; or, the thickness of the pen shell (10) corresponding to the gripping area is less than the thickness of other parts of the pen shell (10).
9. The electronic pen according to claim 1, wherein The piezoelectric ceramic component (11) has a multi-layer structure.
10. An electronic device, comprising: Includes the electronic pen as described in any one of claims 1 to 9.