Novel electronic pen point

Abstract

The invention belongs to the technical field of electronic equipment, and particularly relates to a novel electronic pen point. A nib housing; the sensing optical fiber is spirally wound on the inner wall of the pen point shell, the input end of the sensing optical fiber is connected with a light source module, the output end of the sensing optical fiber is connected with an optical detector module, and the optical detector module is used for receiving an optical signal transmitted by the sensing optical fiber and emitted by the light source module; the optical signal is used for representing the wear state of the pen point. The optical fiber sensing technology is adopted as an abrasion detection means, compared with a traditional detection mode, the optical fiber abrasion detection device has the advantages of being high in sensitivity and anti-interference capacity, can accurately detect tiny abrasion changes of the pen point shell in real time, and greatly improves accuracy and timeliness of detection.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic equipment, and in particular relates to a novel electronic pen tip. Background Art

[0002] A capacitive stylus is a relatively common type of stylus, which can be divided into two types: active capacitive stylus and passive capacitive stylus. The tip of a passive capacitive stylus may include a metal refill. When the metal refill is close enough to the touch screen, the coupling capacitance between the metal refill and the touch screen electrodes can be detected by the touch-sensitive electronic device. Based on the detected coupling capacitance, the touch-sensitive electronic device can determine the position of the passive capacitive stylus tip relative to the touch screen, thereby generating a touch event based on the determined position.

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

[0004] However, as capacitive styluses are used, the housing of the pen tip is likely to wear out, exposing the metal refill and potentially scratching the touch screen. Currently, there's no effective way to detect wear on the housing of a capacitive stylus tip, relying primarily on user observation to determine whether the tip needs replacement. However, this method, which relies on user observation, is inaccurate. To address this issue, a new electronic pen tip has been designed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a new type of electronic pen tip to solve the above-mentioned problems in the background art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A novel electronic pen tip, the pen tip comprising: Pen tip housing; The sensing optical fiber is spirally wound on the inner wall of the pen tip shell. The input end of the sensing optical fiber is connected to the light source module, and the output end of the sensing optical fiber is connected to the 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 is used to characterize the wear state of the pen tip.

[0007] Furthermore, a spiral groove is provided 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.

[0008] Furthermore, 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.

[0009] Furthermore, the optical detector module includes a photodiode, a pre-transimpedance amplifier and an optical interface, and the photodiode is connected to the output end of the sensing optical fiber through the optical interface.

[0010] Furthermore, 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.

[0011] Furthermore, the sensing optical fiber is a single-mode polarization-maintaining optical fiber.

[0012] Furthermore, the end of the pen tip away from the pen body is a smooth curved surface structure.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses optical fiber sensing technology as a wear detection method. Compared with traditional detection methods, it has the characteristics of high sensitivity and strong anti-interference ability. It can accurately detect subtle wear changes of the pen tip shell in real time, greatly improving the accuracy and timeliness of detection; 2. The sensing fiber is spirally wound around the inner wall of the pen tip housing, enabling comprehensive sensing of wear at every location, ensuring comprehensive coverage of the entire pen tip housing. The signal processing module analyzes the relationship between optical property changes and wear levels, accurately determining the extent of wear and providing a reliable trigger signal for the reminder device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an electronic device assembly provided by an embodiment of the present application; Figure 2 A schematic diagram of an electronic pen provided in an embodiment of the present application; Figure 3 A schematic diagram of an electronic pen provided in an embodiment of the present application with a metal refill removed; Figure 4 A schematic diagram of the wear of the pen tip provided in an embodiment of the present application; Figure 5A schematic diagram of a single-side wear of a pen tip provided in an embodiment of the present application; Figure 6 A flowchart of a method for detecting wear of an electronic pen tip provided in an embodiment of the present application; The reference numerals in the drawings of the specification include: 100, electronic pen; 110, pen tip; 120, pen body; 130, metal pen core; 140, light source module; 150, light detector module; 111, spiral groove; 112, sensing fiber; 200. Electronic equipment; 210. Touch screen. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0016] See also Figure 1 , Figure 1 This is a structural diagram of an electronic device component provided in an embodiment of the present application.

[0017] The electronic device assembly includes an electronic device 200 and an electronic pen 100. 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, which can display information such as images or text. The electronic pen 100 includes a pen tip 110 and a pen body 120. The pen tip 110 of the electronic pen 100 can perform touch operations on the touch screen 210 of the electronic device 200. Based on the touch operations of the electronic pen 100, the electronic device 200 can perform operations responsive to the touch operations. In other embodiments, the electronic device 200 can also be an electronic product such as a mobile phone, a laptop computer, a car computer, a smart watch, or a smart bracelet.

[0018] See also Figure 2 , Figure 2The schematic diagram of an electronic pen provided in an embodiment is as follows. The electronic pen 100 includes a pen tip 110, a pen body 120, and a metal pen core 130. The pen tip 110 and the pen body 120 are connected. The pen tip 110 and the pen body 120 can be connected in an integral manner or in a detachable manner. The end of the pen tip 110 away from the pen body 120 is a smooth curved surface structure, thereby preventing the pen tip 110 from scratching the touch screen 210 and increasing the wear resistance of the pen tip 110. The pen tip 110 has a contact end for direct contact with the touch screen 210. A wear-resistant film layer can be coated at the contact end. Under the premise of not affecting the writing performance of the electronic pen, a substance with a sound-absorbing effect can be doped into the pen tip 110 to reduce the noise when the pen tip 110 contacts the capacitive screen, thereby improving the user experience. The pen tip 110 includes a pen tip shell, and a sensing optical fiber 112 is wound around the inner wall of the pen tip shell. The sensing optical fiber is wound around the inner wall of the pen tip shell in a tight and regular spiral shape, and the sensing optical fiber is in full contact with the pen tip shell. Specifically, a spiral groove 111 is provided on the inner wall of the pen tip shell, 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 precisely match the sensing optical fiber. At the same time, a low-refractive-index, high-elasticity optical glue (such as UV-curing glue) is used to fix the sensing optical fiber, ensuring the stability of the optical fiber installation and avoiding the interference of the deformation of the glue itself on the optical fiber sensing performance. The distance between two adjacent circles of sensing optical fiber is 0.5-1 mm, forming a monitoring network covering the entire circumferential angle and axial length of the pen tip shell. When wear occurs at any position of the pen tip shell, the shape and structural changes of the shell at that position will directly affect the sensing optical fiber wrapped around its surface. Please refer to Figure 5 , the front side of the pen tip shell is worn, and the slight deformation caused by the thinning of the shell will squeeze the sensing optical fiber in contact with it; Figure 4 If the middle part of the pen tip shell is worn, it will cause stretching or squeezing of the sensing optical fiber wrapped in this area, thereby ensuring that the sensing optical fiber can sense the wear of various positions of the pen tip shell.

[0019] When grooves form on the housing due to wear, the sensing fiber will microbend in the grooves. According to the principles of fiber optics, microbending causes some of the light signal to couple from the fiber core to the cladding, resulting in increased transmission loss. The optical power of the previously stably transmitted light signal will decrease due to wear. The more severe the wear, the greater the transmission loss and the more pronounced the drop in optical power. When the sensing fiber is subjected to compressive or tensile stress caused by housing wear, an elastic-optic effect occurs. The refractive index of the optical fiber material changes, manifesting as a non-uniform refractive index distribution within the fiber. The speed at which light signals travel through an optical fiber is related to the refractive index. This change in refractive index changes the transmission speed of the light signal, which in turn shifts the phase of the light signal. When the wear of the pen tip housing subjects the optical fiber to uneven stress, the fiber's principal polarization axis can rotate or produce changes in polarization mode dispersion, ultimately changing the polarization state of the light signal.

[0020] Please continue to see Figure 2 The electronic pen 100 also includes a light source module 140, a light detector module 150, and a signal processing module (not shown in the figure). The signal processing module is integrated into the pen body 120. The light source module 140 transmits a light signal to the sensing optical fiber 112, providing a stable light signal source for the pen tip wear detection process. The light detector module 150 is used to receive the light signal emitted by the light source module 140 and transmitted through the sensing optical fiber 112, and convert the received light signal into an electrical signal and transmit 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.

[0021] The light source module 140 uses a device that can emit light signals of stable wavelength and intensity, 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 to the power supply and control circuit of the electronic pen 100. The control circuit ensures that 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.

[0022] 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 to the light source module. The light source module serves as the source of the optical signal and is connected to the power module through a driving circuit, which can provide a stable optical signal input for the sensing optical fiber; the other end is connected to the optical detector module. When the optical signal completes transmission in the sensing optical fiber, it enters the optical detector module for photoelectric conversion.

[0023] In some optional embodiments, one end of the sensing fiber 112 is connected to the distributed feedback (DFB) laser diode in the light source module via an optical interface. This interface utilizes a physical contact fiber adapter and is optically coated to reduce optical signal reflection loss. The other end of the sensing fiber 112 is also connected to the light detector module via an optical interface.

[0024] In this embodiment, the photodetector module and the signal processing module are connected via a signal transmission line. The photodetector module converts the optical signal into an electrical signal, which is then initially amplified by a pre-transimpedance amplifier. The electrical signal is then stably transmitted to the signal processing module via a transmission line such as a shielded conductor or a flexible printed circuit board (FPC). This reduces the impact of external electromagnetic interference on the electrical signal, ensuring that the signal processing module receives accurate signals.

[0025] The InGaAs photodiode in the optical detector module receives the optical signal, which has undergone characteristic changes after transmission through the sensing fiber, and converts it into an electrical signal based on the photoelectric effect. A pre-transimpedance amplifier initially amplifies the converted weak electrical signal and transmits it via a signal transmission line to the signal processing module. Upon receiving the electrical signal, the signal processing module first filters it to remove noise interference, then performs amplification and analog-to-digital conversion. The processed electrical signal is then compared with a baseline electrical signal (corresponding to the initial optical characteristics of the optical signal) when the pen tip housing is unworn. The changes in various parameters (such as optical power, phase, and polarization state) are calculated. The signal processing module incorporates a pre-established model that correlates optical characteristic changes with wear. This model, through extensive experiments and simulations, determines the corresponding degree of wear on the pen tip housing. Based on the calculated optical signal parameter changes and the corresponding model, the current wear level of the pen tip housing can be calculated. To clearly determine whether the pen tip wear requires user replacement, the signal processing module sets different wear thresholds, such as light wear thresholds and heavy wear thresholds. When the calculated wear level of the pen tip shell reaches the light wear threshold, the signal processing module controls the reminder device to remind the user that the pen tip has been worn to a certain extent and needs to be used with caution; when the wear level reaches the heavy wear threshold, the signal processing module strongly reminds the user that the pen tip is severely worn and the pen tip must be replaced in time to avoid scratches on the touch screen.

[0026] In some optional implementation schemes, when the signal processing module analyzes that the degree of wear of the pen tip shell reaches a preset threshold, an instruction is sent to the sound reminder unit through the control line to make it emit warning sounds of different frequencies; an instruction is sent to the light reminder unit to control the annular RGB light strip to display the corresponding color; and an instruction is sent to the wireless communication unit to push the wear data and reminder information to the smart device through Bluetooth 5.3 technology.

[0027] The present application also provides a method for detecting wear of an electronic pen tip, wherein the light detector module 150 obtains light information emitted by the light source module 140 through the sensing optical fiber 112, and the light information corresponds to the wear status of the pen tip; the wear status of the pen tip is determined based on the light information; and a corresponding prompt operation is performed based on a preset threshold value of the wear status.

[0028] The above are only embodiments of the present invention, and the circuits, electronic components and modules involved are all prior art, which can be fully implemented by those skilled in the art. It is needless to say that the content protected by this application does not involve improvements to software and methods. Common knowledge such as the specific structures and characteristics known in the scheme are not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all prior art in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A new type of electronic pen tip, characterized by: The pen tip comprises: Pen tip housing; The sensing optical fiber is spirally wound on the inner wall of the pen tip shell. The input end of the sensing optical fiber is connected to the light source module, and the output end of the sensing optical fiber is connected to the 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 is used to characterize the wear state of the pen tip.

2. The novel electronic pen tip according to claim 1, characterized in that: A spiral groove is provided 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 the output end of the sensing optical fiber are located on the same side close to the pen body.

3. The novel electronic pen tip according to claim 1, characterized in that: 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.

4. 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.

5. 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.

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

7. 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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