A new electronic pen nib

Abstract

The application belongs to the technical field of electronic equipment, and particularly relates to a novel electronic pen nib, which comprises: a pen nib shell; a sensing optical fiber spirally wound on the inner wall of the pen nib shell; an input end of the sensing optical fiber is connected with a light source module; an output end of the sensing optical fiber is connected with a light detector module; the light detector module is used for receiving a light signal transmitted by the sensing optical fiber and emitted by the light source module, and the light signal is used for representing the wear state of the pen nib. The application adopts the optical fiber sensing technology as a wear detection means, has the characteristics of high sensitivity and strong anti-interference ability compared with the traditional detection mode, can detect the slight wear change of the pen nib shell in real time and accurately, and greatly improves the accuracy and timeliness of detection.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic equipment, and particularly relates to a novel electronic pen tip. BACKGROUND

[0002] A capacitive pen is a common touch pen, which can be divided into an active capacitive pen and a passive capacitive pen. The pen tip of the passive capacitive pen can include a metal refill. When the metal refill is close enough to the electrode of the touch screen, the coupling capacitance between the metal refill and the electrode of the touch screen can be detected by the touch electronic device. Based on the detected coupling capacitance, the touch electronic device can determine the position of the pen tip of the passive capacitive pen relative to the touch screen, and thus can generate a touch event based on the determined position.

[0003] The pen tip of the active capacitive pen can also include a metal refill. Unlike the passive capacitive pen, the active capacitive pen can further include a signal generating circuit connected to the metal refill. The signal generating circuit can generate a touch signal and transmit the touch signal to the metal refill. The metal refill can emit the touch signal. After receiving the touch signal, the touch electronic device can determine the position of the pen tip of the active capacitive pen relative to the touch screen based on the touch signal, and thus can generate a touch event based on the determined position.

[0004] However, with the use of the capacitive pen, the shell included in the pen tip is likely to be worn out and expose the metal refill, which can cause the risk of scratching the touch screen. At present, there is a lack of effective detection means for the wear of the shell of the capacitive pen tip, and more reliance is placed on the user's own observation to determine whether the pen tip needs to be replaced. However, the accuracy of the user's own observation is poor. Therefore, a novel electronic pen tip is designed to improve. SUMMARY

[0005] In view of the above deficiencies in the prior art, the present application provides a novel electronic pen tip to solve the problems in the background art.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0007] A novel electronic pen tip, the pen tip comprising:

[0008] a pen tip shell;

[0009] a sensing optical fiber spirally wound on the inner wall of the pen tip shell, an input end of the sensing optical fiber being connected with a light source module, an output end of the sensing optical fiber being connected with a light detector module, the light detector module being configured to receive a light signal transmitted by the light source module through the sensing optical fiber, the light signal being configured to represent a wear state of the pen tip.

[0010] Further, a spiral groove is arranged on the inner wall of the pen tip shell, and the sensing optical fiber is fixedly installed in the spiral groove, and the input end and the output end of the sensing optical fiber are located on the same side close to the pen body.

[0011] Further, the signal processing module is electrically connected with the light detector module, the light detector module converts the received optical signal into an electrical signal and transmits the electrical signal to the signal processing module, and the signal processing module judges the wear degree of the pen tip shell according to the received electrical signal.

[0012] Further, the light detector module comprises a photodiode, a pre-transimpedance amplifier and an optical interface, and the photodiode is connected with the output end of the sensing optical fiber through the optical interface.

[0013] Further, the light source module comprises a laser diode, a driving circuit and an optical interface, the laser diode is connected with the driving circuit, and the laser diode is connected with the input end of the sensing optical fiber through the optical interface.

[0014] Further, the sensing optical fiber is a single-mode polarization maintaining optical fiber.

[0015] Further, the end of the pen tip away from the pen body is a smooth arc surface structure.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The present application adopts optical fiber sensing technology as the wear detection means, which has the characteristics of high sensitivity and strong anti-interference ability compared with the traditional detection method, can detect the slight wear change of the pen tip shell in real time and accurately, and greatly improves the accuracy and timeliness of detection.

[0018] 2. The sensing optical fiber is spirally wound on the inner wall of the pen tip shell, which can comprehensively perceive the wear condition of each position of the pen tip shell, and ensure that the detection result covers the entire pen tip shell. The signal processing module analyzes based on the accurate optical characteristic change and wear degree corresponding relationship model, and can accurately judge the wear degree of the pen tip shell, and provides a reliable trigger signal for the reminding device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of an electronic device assembly provided by the embodiment of the present application;

[0020] Figure 2 is a schematic diagram of an electronic pen provided by the embodiment of the present application;

[0021] Figure 3 is a schematic diagram of an electronic pen provided by the embodiment of the present application;

[0022] Figure 4 A schematic diagram of the tip end wear of the pen tip provided by the embodiment of the present application;

[0023] Figure 5 A schematic diagram of the single-side edge wear of the pen tip provided by the embodiment of the present application;

[0024] Figure 6 A flowchart of a wear detection method of a pen tip of an electronic pen provided by the embodiment of the present application;

[0025] The reference signs in the drawings of the specification include:

[0026] 100, electronic pen; 110, pen tip; 120, pen body; 130, metal refill; 140, light source module; 150, light detector module; 111, spiral groove; 112, sensing optical fiber;

[0027] 200, electronic device; 210, touch screen. DETAILED DESCRIPTION

[0028] In order for those skilled in the art to better understand the present application, the technical solutions of the present application are further described below in conjunction with the drawings and embodiments.

[0029] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of an electronic device assembly provided by the embodiment of the present application.

[0030] The electronic device assembly includes an electronic device 200 and an electronic pen 100, and the electronic pen 100 can touch the electronic device 200. For example, the electronic device 200 is a tablet computer. The electronic device 200 includes a touch screen 210, and the touch screen 210 can display information such as pictures or texts. The electronic pen 100 includes a pen tip 110 and a pen body 120, and the pen tip 110 of the electronic pen 100 can perform a touch operation on the touch screen 210 of the electronic device 200. The electronic device 200 can perform an operation in response to the touch operation of the electronic pen 100 based on the touch operation of the electronic pen 100. In other embodiments, the electronic device 200 can also be an electronic product such as a mobile phone, a notebook computer, a car machine, a smart watch, a smart bracelet, etc.

[0031] Please refer to Figure 2 , Figure 2A schematic diagram of an electronic pen provided for the embodiment, the electronic pen 100 comprises a pen tip 110 and a pen body 120 and a metal pen core 130, wherein the pen tip 110 and the pen body 120 are connected, and the pen tip 110 and the pen body 120 can be integrally connected or detachably connected. The end of the pen tip 110 away from the pen body 120 is a smooth arc surface structure, thereby preventing the pen tip 110 from scratching the touch screen 210, and also increasing the wear resistance of the pen tip 110. The pen tip 110 has a contact end for directly contacting the touch screen 210, a wear-resistant film layer can be coated at the contact end, and a substance with a silencing effect can be doped in the pen tip 110 without affecting the writing performance of the electronic pen, so as to reduce the noise when the pen tip 110 contacts the capacitive screen, thereby improving the user experience. The pen tip 110 comprises a pen tip shell, and a sensing optical fiber 112 is wound on the inner wall of the pen tip shell. The sensing optical fiber is tightly and regularly wound in a spiral shape on the inner wall of the pen tip shell and is in full contact with the pen tip shell. Specifically, the inner wall of the pen tip shell is provided with a spiral groove 111, and the sensing optical fiber 112 is installed in the spiral groove 111. The depth and width of the spiral groove on the inner wall of the pen tip shell are accurately matched with the sensing optical fiber, and low-refractive-index and high-elasticity optical glue (such as UV curing glue) is used to fix the sensing optical fiber, so as to ensure the stability of the optical fiber installation and avoid the interference of the deformation of the glue itself on the sensing performance of the optical fiber. The spacing between adjacent two turns of the sensing optical fiber is 0.5-1 mm, forming a monitoring network covering the full angle of the circumferential direction and the length of the axial direction of the pen tip shell. When any position of the pen tip shell is worn, the shape and structure change of the shell at this position will directly act on the sensing optical fiber wound on the surface thereof. Please refer to Figure 5 , the wear of the front end side of the pen tip shell causes the slight deformation of the shell to extrude the sensing optical fiber in contact therewith; please refer to Figure 4 , if the middle part of the pen tip shell is worn, it will stretch or extrude the sensing optical fiber wound in the area, thereby ensuring that the sensing optical fiber can sense the wear of each position of the pen tip shell.

[0032] When the surface of the shell is worn to form a groove, the sensing optical fiber at the groove will be bent, according to the principle of optical fiber optics, the micro-bending will cause part of the optical signal to be coupled from the core layer to the cladding layer, thereby increasing the transmission loss. The light power of the originally stable transmission optical signal will be reduced due to wear, and the more serious the wear, the greater the transmission loss, and the more obvious the light power drop. When the sensing optical fiber is extruded or stretched by the wear of the shell, the photoelastic effect will occur. The refractive index of the optical fiber material will change, which is specifically manifested as that the refractive index distribution inside the optical fiber is no longer uniform. The speed of the optical signal in the optical fiber is related to the refractive index, and the change of the refractive index will change the transmission speed of the optical signal, thereby causing the phase of the optical signal to change. When the pen tip shell is worn to cause the sensing optical fiber to be subjected to uneven stress, the principal axis of the optical fiber will rotate or the polarization mode dispersion will change, finally leading to the change of the polarization state of the optical signal.

[0033] Please continue to please refer to Figure 2 The electronic pen 100 further comprises a light source module 140, a light detector module 150, and a signal processing module (not shown in the figure), which is integrated inside the pen body 120; wherein the light source module 140 emits light signals to the sensing optical fiber 112, providing a stable light signal source for the tip wear detection process; the light detector module 150 is used to receive the light signals transmitted by the sensing optical fiber 112 emitted by the light source module 140, and convert the received light signals into electrical signals and transmit them to the signal processing module; the signal processing module determines the wear degree of the tip shell according to the received electrical signals.

[0034] The light source module 140 adopts a device capable of emitting stable wavelength and intensity light signals, such as a laser diode. The light source module 140 is installed in the pen body 120, or can be installed at the end of the pen tip 110 close to the pen body 120, and is connected with the power supply and control circuit of the electronic pen 100. Through the control circuit, the light source module continuously and stably emits light signals to the sensing optical fiber, providing a stable light signal source for the entire detection process.

[0035] In this embodiment, the sensing optical fiber 112 adopts a single-mode polarization maintaining optical fiber. One end of the sensing optical fiber 112 is connected with the light source module, which serves as the source of light signals. The light source module is connected with the power module through a driving circuit, and can provide stable light signal input to the sensing optical fiber. The other end is connected with the light detector module. After the light signal completes transmission in the sensing optical fiber, it enters the light detector module for photoelectric conversion.

[0036] In some optional embodiments, one end of the sensing optical fiber 112 is connected with a distributed feedback (DFB) laser diode in the light source module through an optical interface. A physical contact type fiber adapter is used at the interface, and optical coating treatment is performed to reduce light signal reflection loss. The other end of the sensing optical fiber 112 is also connected to the light detector module through an optical interface.

[0037] In this embodiment, the light detector module and the signal processing module are connected through a signal transmission line. After the light detector module converts the light signal into an electrical signal and preliminarily amplifies it through a preamplifier, the electrical signal is stably transmitted to the signal processing module through a transmission line such as a shielded wire or a flexible printed circuit board (FPC). This reduces the influence of external electromagnetic interference on the electrical signal and ensures that the signal processing module receives accurate electrical signals.

[0038] The InGaAs photodiode in the optical detector module receives the light signal with changed characteristics transmitted through the sensing optical fiber, and converts it into an electrical signal based on the photoelectric effect. The preamplifier amplifies the weak electrical signal converted, and transmits it to the signal processing module through the signal transmission line. After receiving the electrical signal, the signal processing module first performs filtering processing to remove noise interference, and then performs amplification, analog-to-digital conversion and other operations. Then, the processed electrical signal is compared with the reference electrical signal (corresponding to the initial optical characteristics of the light signal) when the pen tip shell is not worn, and the change amount of each parameter (such as the electrical signal parameters corresponding to the optical power, phase, and polarization state) is calculated. The signal processing module has a pre-established corresponding relationship model between the change of optical characteristics and the degree of wear, which is determined through a large number of experiments and simulations. Different optical characteristic change amounts correspond to different degrees of wear of the pen tip shell. According to the calculated change amount of the optical signal parameters and the corresponding relationship model, the real-time wear degree of the pen tip shell can be calculated. In order to clearly determine whether the pen tip needs to be replaced, different levels of wear thresholds are set in the signal processing module. For example, a light wear threshold and a heavy wear threshold are set. When the calculated wear degree of the pen tip shell reaches the light wear threshold, the signal processing module controls the reminder device to prompt the user that the pen tip has been worn to a certain extent and needs to be used with caution; when the wear degree reaches the heavy wear threshold, the signal processing module strongly reminds the user that the pen tip is severely worn and must be replaced in time to avoid scratching the touch screen.

[0039] In some optional embodiments, when the signal processing module analyzes that the wear degree of the pen tip shell reaches the preset threshold, the control line sends instructions to the sound reminder unit to emit warning sounds of different frequencies, sends instructions to the light reminder unit to control the annular RGB light belt to display corresponding colors, and sends instructions to the wireless communication unit to push the wear data and reminder information to the smart device through Bluetooth 5.3 technology.

[0040] The application also provides a method for detecting the wear of an electronic pen tip. The optical detector module 150 acquires light information emitted by the light source module 140 through the sensing optical fiber 112, which corresponds to the wear state of the pen tip; determines the wear state of the pen tip according to the light information; and performs a corresponding prompt operation according to the preset threshold of the wear state.

[0041] The above is only an embodiment of the present application, and relates to circuits and electronic components and modules, which are all prior art. Those skilled in the art can implement the present application without further description. The present application does not involve improvement of software and methods. Commonly known specific structures and characteristics in the scheme are not described in detail herein. Those skilled in the art know all common technical knowledge in the technical field of the present application before the filing date or the priority date, can know all prior art in the field, and have the ability to apply conventional experimental means before the date. Those skilled in the art can perfect and implement the present scheme based on their own ability under the guidance of the present application. Some typical known structures or known methods should not be an obstacle for those skilled in the art to implement the present application. It should be pointed out that, for those skilled in the art, a number of modifications and improvements can be made without departing from the structure of the present application. These should also be considered as the protection scope of the present application, and these will not affect the implementation effect and practicality of the patent.

Claims

1. A new type of electronic pen tip, characterized by: The pen tip comprises: A pen tip housing, wherein the inner wall of the pen tip housing is provided with a spiral groove; A sensing optical fiber is spirally wound on the inner wall of the pen tip housing, the sensing optical fiber is fixedly installed in the spiral groove, and the input end and output end of the sensing optical fiber are located on the same side close to the pen body; The input end of the sensing optical fiber is connected to a light source module, and the output end of the sensing optical fiber is connected to a light detector module. The light detector module is used to receive the light signal emitted by the light source module and transmitted through the sensing optical fiber. The light signal includes light power, phase, and polarization state of light. The light signal is used to characterize the wear state of the pen tip. It also includes a signal processing module, which is electrically connected to the light detector module. The light detector module converts the received light signal into an electrical signal and transmits it to the signal processing module. The signal processing module determines the degree of wear of the pen tip shell based on the received electrical signal.

2. The novel electronic pen tip according to claim 1, characterized in that: The optical detector module includes a photodiode, a pre-transimpedance amplifier and an optical interface. The photodiode is connected to the output end of the sensing optical fiber through the optical interface.

3. The novel electronic pen tip according to claim 1, characterized in that: The light source module includes a laser diode, a driving circuit and an optical interface. The laser diode is connected to the driving circuit, and the laser diode is connected to the input end of the sensing optical fiber through the optical interface.

4. The novel electronic pen tip according to claim 1, characterized in that: The sensing optical fiber is a single-mode polarization-maintaining optical fiber.

5. The novel electronic pen tip according to claim 1, characterized in that: The end of the pen tip away from the pen body is a smooth curved surface structure.

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