WO2021143423A1

WO2021143423A1 - Stylus

Info

Publication number: WO2021143423A1
Application number: PCT/CN2020/136336
Authority: WO
Inventors: 陈文俊; 李艳波; 马宁; 王克猛; 郑红生; 郑涛
Original assignee: 华为技术有限公司
Priority date: 2020-01-16
Filing date: 2020-12-15
Publication date: 2021-07-22
Also published as: CN113138680A; CN113138680B

Abstract

Provided is a stylus (100), said stylus (100) comprising a main body (10) and a pen tip (20); said pen tip (20) is arranged at one end of the main body (10); at least a part of the pen tip (20) is used for contacting a touch-control screen of an electronic device; the pen tip (20) comprises a first radiating body (P1); said first radiator (P1) simultaneously serves as a Bluetooth radiating part and a radiating part of the stylus (100); the first radiating body (P1) is used for sending and receiving Bluetooth signals, and is used for receiving or sending electrode signals; the electrode signal can be used by the touch-control screen of the electronic device to determine a touch-control position of the stylus (100). The stylus (100) can be provided with a Bluetooth antenna in the limited space of the stylus (100), improving user experience.

Description

Stylus

Technical field

This application relates to the field of electronic technology, and in particular to a stylus.

Background technique

At present, the stylus is a relatively common input device used with electronic equipment (such as mobile phones, tablet computers, etc.), which is convenient for people's lives. The electrodes of the stylus and the Bluetooth antenna cooperate with each other to provide users with a more realistic writing experience. In addition, the Bluetooth antenna can also realize functions such as power return and air mouse control.

An existing stylus structure is shown in Figure 1, including a pen body 12, an electrode 14 and a Bluetooth antenna 16. The electrode 14 and the Bluetooth antenna 16 are of separate design. The electrode 14 is arranged at the end of the pen body 12. The antenna 16 can be arranged in the middle of the pen or at the end of the pen. In addition, referring to FIG. 1, when the stylus is in the writing mode or the air mouse mode, the Bluetooth antenna 16 will be easily held at the center of the pen or at the end of the pen. However, in the process of implementing the present invention, the inventor found that the structure of the above-mentioned stylus has at least the following problems: on the one hand, the Bluetooth antenna will occupy the space of the stylus, compress the battery volume, and reduce the endurance of the whole machine; on the other hand, , Because the Bluetooth antenna is in the middle of the pen or at the end of the pen, it is easy to be held in actual use, resulting in increased signal transmission delay, which will affect the user experience.

Summary of the invention

The embodiment of the present application provides a stylus pen, in which a Bluetooth antenna is arranged at the tip of the stylus, which can not occupy the volume of the battery, and at the same time can improve the user experience.

The embodiment of the present application provides a stylus, including:

main body;

A pen tip, the pen tip is arranged at one end of the main body, at least a part of the pen tip is used to contact a touch screen of an electronic device; and

The pen tip includes a first radiator, the first radiator serves as the Bluetooth radiating part and the electrode radiating part of the stylus at the same time, the first radiator is used to send and receive Bluetooth signals, and is used to receive or send electrodes Signal. With the stylus provided in the present application, the Bluetooth antenna and the electrode can share the first radiator, and the Bluetooth signal can be sent and received through the first radiator, and the first radiator can also be used to receive or Sending electrode signals, the electrode signals being used by the touch screen of the electronic device to determine the touch position of the stylus pen. As a result, the radiator can be arranged at the end of the main body of the stylus, and the volume of the main body of the stylus does not need to be additionally occupied, that is, the battery volume of the stylus can not be invaded, and the user experience can also be improved.

In a possible design, the stylus further includes a Bluetooth module, and the Bluetooth module is electrically connected to the first radiator to send and receive the Bluetooth signal through the first radiator. In this way, the stylus can establish a communication connection with the electronic device through the Bluetooth module, thereby providing the user's experience.

In another possible design, the stylus further includes a first isolation element, a first end of the first isolation element is electrically connected to the first radiator, and a second end of the first isolation element It is electrically connected to the Bluetooth module. Therefore, the electrode signal can be isolated by the first isolation element, so as to prevent these low-frequency square wave signals from causing interference to the Bluetooth module, and the first isolation element can also prevent the electrode signal from being passed through the Bluetooth module. The short-circuit fails, thereby improving the user experience.

In another possible design, the stylus further includes a Bluetooth matching circuit, and the Bluetooth matching circuit is electrically connected between the second end of the first isolation element and the Bluetooth module for balancing The impedance between the Bluetooth module and the first radiator. As a result, the impedance between the Bluetooth module and the first radiator can be balanced, so that the impedance between the two can reach a matching state, thereby improving the user experience.

In another possible design, the stylus pen further includes a control module electrically connected to the first radiator to send and receive the electrode signal through the first radiator. Thus, the stylus can send and receive the electrode signal through the control module and the first radiator, so that the electronic device can determine the touch of the stylus on the pen tip of the electronic device based on the electrode signal. Control the location, and then improve the user experience.

In another possible design, the stylus further includes a second isolation element, and the second isolation element is electrically connected between the first radiator and the control module. Therefore, the Bluetooth signal can be isolated by the second isolation element, so as to prevent these high-frequency Bluetooth signals from causing interference to the control module, thereby improving the user experience.

In another possible design, the stylus further includes a third isolation element, the first end of the third isolation element is electrically connected to the first radiator, and the second end of the third isolation element Grounded. As a result, the third isolation element can prevent the electrode signal from being short-circuited to the ground to fail, thereby improving the user experience.

In another possible design, the first radiator includes a first power feeder and a second power feeder, and the Bluetooth module feeds a radio frequency signal to the first radiation through the first power feeder The control module feeds a voltage signal to the first radiator through the second power feeder. In this way, the Bluetooth module can realize that the radiator radiates a Bluetooth signal by feeding a radio frequency signal to the first power feeder, and the first radiator can also receive electrode signals.

In another possible design, the first radiator includes a first radiating part, and the first power feeding part and the second power feeding part are both provided at a first end of the first radiating part. Thus, the Bluetooth module can realize that the radiator radiates Bluetooth signals by feeding a current signal to the first power feeder, and the first radiator can also receive electrode signals.

In another possible design, the radiator further includes a second radiating part, and the second end of the first radiating part is electrically connected to the first end of the second radiating part. Thus, the Bluetooth module can feed radio frequency signals to the first power feeder, so that the first radiator can finally send and receive Bluetooth signals, and the first radiator can also receive or send electrodes. Signal, and then improve the user experience.

In another possible design, the second end of the first radiating portion extends upward to form a connecting portion, and the second end of the first radiating portion is electrically connected to the second radiating portion through the connecting portion.

In another possible design, a first opening is formed between the first end and the second end of the first radiating part, and a second opening is formed between the first end and the second end of the second radiating part . As a result, the user experience is improved.

In another possible design, the first power feeder and the second power feeder are both disposed adjacent to the first opening. As a result, the user experience is improved.

The stylus provided in the embodiments of the present application uses the same radiator to radiate Bluetooth signals and receive or send electrode signals, and achieve signal isolation through inductors and capacitive devices, so as to realize the coexistence of the two. The main body of the stylus saves space for the layout of the Bluetooth antenna, avoids encroaching on the volume of the battery, improves the battery life experience, and can also reduce the risk of the Bluetooth antenna being held by hand, and enhance the user experience.

Description of the drawings

FIG. 1 is a schematic diagram of a stylus pen and its use in the prior art.

Fig. 2 is a schematic diagram of a stylus provided by an embodiment of the present application.

Fig. 3 is a circuit diagram of the stylus provided by the first embodiment of the present application.

Fig. 4 is a circuit diagram of the stylus provided by the second embodiment of the present application.

Fig. 5 is a circuit diagram of the stylus provided by the third embodiment of the present application.

Fig. 6 is a schematic diagram of the tip of a stylus provided by an embodiment of the present application.

Fig. 7 is a schematic diagram of a radiator proposed in an embodiment of the present application.

Fig. 8 is a schematic diagram of a Bluetooth radiation unit proposed by an embodiment of the present application.

FIG. 9 is a schematic diagram of an electrode radiation part proposed by an embodiment of the present application.

FIG. 10 is a graph of S parameter (scattering parameter) of the radiator in the stylus provided by an embodiment of the present application.

FIG. 11 is a diagram of the radiation efficiency of the radiator in the stylus provided by an embodiment of the present application.

Symbol description of main components

Handwriting pen 100

Subject 10

Pen body 12

Electrode 14

Bluetooth antenna 16

Writing note 20

Bluetooth Radiation Department 22

Electrode Radiation Department 24

Battery 30

Circuit board 40

The first radiator P1

The first isolation element P2

The second isolation element P3

Bluetooth matching circuit P4

Control module P5

The third isolation element P6

The second radiator P7

Third radiator P8

Bluetooth module P9

First Radiation Department 32

The first feeder department 322

The second feeder department 324

The first opening 326

Grounding department 328

Second Radiation Department 34

The second opening 342

Connection Department 36

The following specific embodiments will further describe this application in detail in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them.

Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art to which this application belongs without creative work are within the protection scope of this application.

Please refer to FIG. 2, an embodiment of the present application provides a stylus 100. The stylus 100 in the embodiment of the present application can be associated with an electronic device (not shown) with a touch function, and the display content of the electronic device can be operated through the stylus 100. Wherein, the electronic device may be a mobile phone, a handheld computing device, a personal digital assistant (PDA), a tablet computer, or the like.

The stylus 100 in the embodiment of the present application may include a main body 10 and a pen tip 20.

Specifically, when the user holds the stylus 100, the main body 10 is used to provide a holding part. That is, the user holds the main body 10 and then holds the stylus pen 100.

Optionally, when the stylus 100 in the embodiment of the present application needs to send out signals, the main body 10 may also be used to house the battery 30, the circuit board 40, and other related devices, which is not specifically limited in the present application.

Further, in a specific implementation process, in order to enable the user to hold it comfortably, the main body 10 may be configured as a cylinder, or an ellipsoid is a better choice. Of course, those of ordinary skill in the art to which this application belongs can also set the main body 10 in other three-dimensional shapes such as a rectangular parallelepiped, and this application does not make specific restrictions.

In the embodiment of the present application, the pen tip 20 is provided at one end of the main body 10, and at least a part of the pen tip 20 is used to contact the touch screen of the electronic device, so that the electronic device can determine the touch of the stylus on the touch screen. Therefore, when the user holds the main body 10, the pen tip 20 can be used for touch control, so as to realize the input of information by the stylus. In the embodiment of the present application, the central axis of the pen tip 20 and the main body 10 may be collinear. In other embodiments, the central axis of the pen tip 20 and the main body 10 may not be collinear.

Further, in the embodiment of the present application, the pen tip 20 may include a first radiator P1, and the first radiator P1 may simultaneously serve as the Bluetooth radiating part and the electrode radiating part of the stylus. The first radiator P1 is used for sending and receiving Bluetooth signals, and for receiving or sending electrode signals. It can be understood that, in the embodiment of the present application, the electrode signal can be used by the touch screen of the electronic device to determine the touch position of the stylus pen. That is, in the embodiment of the present application, the first radiator P1 can be used to receive electrode signals. In some embodiments of the present application, the first radiator P1 may also be used to transmit electrode signals.

In a specific implementation process, the stylus 100 can send a Bluetooth signal to an electronic device and receive a Bluetooth signal of the electronic device through the first radiator P1. The stylus 100 can also send electrode signals to or receive electrode signals of the electronic device through the first radiator P1.

Optionally, in some embodiments of the present application, the electrode signal may be a voltage signal, that is, the electrode signal may be a voltage square wave signal with a frequency band of 100KHz-500KHz.

Further, the pen tip 20 may further include a second radiator P7 and a third radiator P8. In an embodiment of the present application, the second radiator P7 and the third radiator P8 are both TX electrodes, that is, the second radiator P7 and the third radiator P8 can both be used to direct electrons The device sends electrode signals.

Since the tip 20 of the stylus 100 in the embodiment of the present application is a position that the user does not often hold, it is difficult for the user to touch the first radiator P1 regardless of whether the stylus is in the writing mode or the air mouse mode. Improve user experience. That is, in the embodiment of the present application, the Bluetooth antenna can be arranged in the limited space of the stylus, and at the same time, the user's hand-holding experience can also be taken into consideration.

In addition, since the first radiator P1 is arranged at the position of the pen tip, there is no need to additionally occupy the volume of the main body 10 in the stylus 100.

In the embodiment of the present application, by using a first radiator P1 to send and receive Bluetooth signals and receive or send electrode signals, there is no need to separately perform headroom processing for the Bluetooth antenna, so the appearance of the all-metal pen holder can be adapted.

Please refer to FIG. 3, which is a circuit diagram of the first embodiment of the stylus 100 of the present application. The stylus 100 may include a first isolation element P2 and a Bluetooth matching circuit P4. In the embodiment of the present application, the first isolation element P2 may be a capacitor.

The first end of the first isolation element P2 is electrically connected to the first radiator P1, and the second end of the first isolation element P2 is electrically connected to the Bluetooth matching circuit P4. That is, Bluetooth signals can be sent and received through the first radiator P1.

In the embodiment of the present application, the stylus 100 may further include a second isolation element P3. In some embodiments of the present application, the second isolation element P3 may be an inductor.

The second isolation element P3 is electrically connected to the first radiator P1. That is, in an embodiment of the present application, the electrode signal can be received through the second isolation element P3 and the first radiator P1.

Please refer to FIG. 4, which is a circuit diagram of a second embodiment of the stylus 100 of this application. The differences between the stylus pen 100 of this embodiment and the stylus pen 100 of the first embodiment are:

In the embodiment of the present application, the stylus 100 may further include a third isolation element P6. Specifically, the first end of the third isolation element P6 is electrically connected to the first radiator P1, and the second end of the third isolation element P6 is grounded. In the embodiment of the present application, the third isolation element P6 may optionally be a capacitor.

In the embodiment of the present application, the first radiator P1 may be an inverted F antenna (IFA) mode with its own grounding leg.

In the embodiment of the present application, the third isolation element P6 can be used to prevent the electrode signal from entering the Bluetooth module, and can prevent the electrode signal from being short-circuited to the ground through the Bluetooth module.

Please refer to FIG. 5, which is a circuit diagram of a third embodiment of the stylus 100 of the present application. The differences between the stylus pen 100 of this embodiment and the stylus pen 100 of the first embodiment are:

In the embodiment of the present application, the stylus 100 may further include a control module P5 and a Bluetooth module P9.

Specifically, the second isolation element P3 is electrically connected between the first radiator P1 and the control module P5, and the control module P5 is electrically connected to the first isolation element P3 through the second isolation element P3. The radiator P1, whereby the control module P5 can receive electrode signals or send electrode signals through the first radiator P1.

In an embodiment of the present application, the control module P5 may be provided in the main body 10.

In the embodiment of the present application, the Bluetooth module P9 is electrically connected to the Bluetooth matching circuit P4. That is, the Bluetooth module P9 is electrically connected to the first radiator P1, and further transmits and receives the Bluetooth signal through the first radiator P1.

It can be understood that, in this embodiment, the stylus 100 can establish a communication connection with an electronic device through the Bluetooth module P9. In an embodiment of the present application, the Bluetooth module P9 may be provided in the main body 10.

In the embodiment of the present application, the Bluetooth matching circuit P4 can be electrically connected between the second end of the first isolation element P2 and the Bluetooth module P9, and thus can be used to balance the Bluetooth module P9 and the Bluetooth module P9. The impedance between the first radiator P1 in turn enables the impedance between the two to reach a matching state.

It can be understood that, in order to prevent the electrode signal of the control module P5 (such as a square wave signal of 100KHz˜500KHz) from entering the Bluetooth module P9 and causing interference. In the embodiment of the present application, the first isolation element P2 (such as a capacitor) is provided between the first radiator P1 and the Bluetooth module P9, that is, the capacitor can prevent the electrode from the control module P5 The signal enters the Bluetooth module P9 to avoid the electrode signal from causing interference to the Bluetooth module P9. In addition, the first isolation element P2 can also be used to prevent the electrode signal from being short-circuited through the Bluetooth module P9.

It can be understood that, in order to prevent the Bluetooth signal of the Bluetooth module P9 from entering the control module P5 and causing interference, in the embodiment of the present application, the first radiator P1 and the control module P5 are provided between the The second isolation element P3 (such as an inductor) prevents high-frequency Bluetooth signals from entering the control module P5 through the inductor.

Thus, the effect of isolating Bluetooth signals and electrode signals can be achieved through the first isolation element P2 and the second isolation element P3, and the sending and receiving functions of Bluetooth signals and electrode signals can be achieved through the same radiator.

Optionally, the first isolation element P2 and the second isolation element P3 are both disposed close to the first radiator P1.

It can be understood that, in some embodiments of the present application, multiple first isolation elements may be connected in series between the first radiator P1 and the Bluetooth module P9, or the first radiator P1 and the Bluetooth module P9 may be connected in series. Multiple first isolation elements can also be connected in parallel. For example, multiple capacitors may be connected in series between the first radiator P1 and the Bluetooth module P9, or multiple capacitors may be connected in parallel between the first radiator P1 and the Bluetooth module P9. In addition, the capacitance value between the first radiator P1 and the Bluetooth module P9 can be changed and adjusted according to actual needs.

In some embodiments of the present application, multiple second isolation elements may be connected in series between the first radiator P1 and the control module P5, or between the first radiator P1 and the control module P5 Multiple second isolation elements can also be connected in parallel. For example, multiple inductors may be connected in series between the first radiator P1 and the control module P5, or multiple inductors may be connected in parallel between the first radiator P1 and the control module P5. In addition, the inductance value between the first radiator P1 and the control module P5 can be changed and adjusted according to actual needs.

It should be noted that the number and value of capacitance between the first radiator P1 and the Bluetooth module P9, and the number and value of inductance between the first radiator P1 and the control module P5 are not This application is the only form, and this application is not specifically restricted here.

In some embodiments of the present application, the battery 30 and the circuit board 40 are both arranged in the main body 10. Optionally, the Bluetooth module P9 and the control module P5 can be set on the circuit board 40, and the battery 30 can be used to provide related devices such as the Bluetooth module P9 and the control module P5. power supply.

Please refer to FIG. 6. FIG. 6 shows a partial structure diagram of the pen tip 20 according to an embodiment of the application.

In an embodiment of the present application, the third radiator P8 is sleeved on the second radiator P7, and the first radiator P1 is sleeved on the second radiator P7. In some embodiments of the present application, the second radiator P7 and the third radiator P8 are both electrically connected to the control module P5, that is, the second radiator P7 and the third radiator P8 Both can be used to send electrode signals to electronic devices.

It can be understood that, in the embodiment of the present application, both the second radiator P7 and the third radiator P8 can be TX electrodes. Specifically, in the embodiment shown in FIG. 6, the second radiator P7 is a columnar electrode, and the third radiator P8 is a cone-shaped ring electrode. It should be noted that the design of the electrode shape can be different according to actual needs, that is, the electrode shapes of the second radiator P7 and the third radiator P8 shown in the embodiment of the present application are only used as an example for illustration, not It is a specific limitation of this application.

Please refer to FIG. 7, which shows a specific structure diagram of the first radiator P1 according to an embodiment of the application.

In the embodiment of the present application, the first radiator P1 has a spiral structure. The length of the first radiator P1 may be a quarter of the working wavelength of the Bluetooth antenna. In the embodiment of the present application, the length of the first radiator P1 may be 25 mm. Therefore, the Bluetooth signal radiated by the first radiator P1 can be made to work in the 2.4 GHz Bluetooth frequency band.

In the embodiment of the present application, the first radiator P1 may include a first radiating part 32 and a second radiating part 34.

In the embodiment of the present application, the first end of the first radiating portion 32 may be provided with a grounding portion 328. The grounding portion 328 can be connected to the main body 10 through a cable (not shown) to provide a ground for the first radiator P1.

Specifically, the cable may include a core (not shown) and an outer conductor (not shown) surrounding the core. One end of the wire core is electrically connected to the grounding portion 328, and the outer conductor is electrically connected to a metal component (not shown) in the main body 10, so as to realize the grounding of the first radiator P1.

It can be understood that, in the embodiment of the present application, both the first radiating portion 32 and the second radiating portion 34 are substantially annular.

The first end of the first radiation portion 32 is provided with a first power feeding portion 322. Therefore, the Bluetooth module P9 can feed the radio frequency signal F1 to the first radiating part 32 through the first feeding part 322. In the embodiment of the present application, the first end of the first radiating portion 32 is further provided with a second power feeding portion 324. In some embodiments of the present application, the control module P5 may feed a voltage signal V1 to the first radiating part 32 through the second power feeding part 324, or an electrode signal received by the first radiator P1 It can also be transmitted to the control module P5 through the second feeder 324.

Further, the second end of the first radiating portion 32 extends upward to form a connecting portion 36. The second end of the first radiating portion 32 is electrically connected to the first end of the second radiating portion 34 through the connecting portion 36, so that the first radiator P1 can radiate Bluetooth signals and electrodes outward Signal.

A first opening 326 is formed between the first end and the second end of the first radiating portion 32, and a second opening 342 is formed between the first end and the second end of the second radiating portion 34. In this embodiment, the first power feeding portion 322 and the second power feeding portion 324 are both disposed close to the first opening 326.

It can be understood that, in this embodiment, the first radiating portion 32, the second radiating portion 34, the connecting portion 36, the first feeding portion 322, and the second feeding portion 324 may be It is made of materials such as iron parts, metal copper foil, and conductors in the laser direct structuring (LDS) process.

As shown in FIG. 8, when the Bluetooth module P9 feeds radio frequency signals to the first radiating portion 32 through the first feeding portion 322, the first radiator P1 at this time can be used as a Bluetooth radiating portion 22 to use.

That is, the Bluetooth module P9 at this time can send and receive Bluetooth signals through the Bluetooth radiation part 22, so that the stylus can establish a Bluetooth connection with the electronic device.

Please refer to FIG. 9, when the control module P5 feeds a voltage signal to the first radiation portion 32 through the second power feeding portion 324, the first radiator P1 at this time can serve as the electrode radiation portion 24 To use.

That is, the control module P5 at this time can send or receive electrode signals through the electrode radiation part 24, so that the electronic device can determine the touch of the stylus on the touch screen of the electronic device based on the electrode signal. Location.

Fig. 10 is a graph of S parameter (scattering parameter) of the stylus. Among them, the curve S101 is a graph of S parameters (scattering parameters) of the stylus without TX electrodes, and the curve S102 is a graph of S parameters (scattering parameters) of the stylus with TX electrodes. It can be seen from FIG. 10 that the stylus can make the Bluetooth signal radiated by the first radiator P1 work in the 2.4 GHz Bluetooth frequency band.

Please refer to FIG. 11, which is a graph of the radiation efficiency of the stylus 100. It can be seen from FIG. 11 that the resonance of Bluetooth is biased towards a low level, and the peak efficiency of the first radiator P1 drops by about 3 dB.

The stylus 100 provided by the embodiment of the present application uses a radiator to radiate Bluetooth signals and electrode signals, and can realize signal isolation through inductance and capacitance, so as to realize the coexistence of the two, so as to lay out in the limited space of the stylus Bluetooth antenna. On the one hand, it can reduce the risk of hand-holding, on the other hand, it can increase the available battery space and improve the user experience.

For those skilled in the art, it is obvious that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, no matter from which point of view, the above-mentioned embodiments of this application should be regarded as exemplary and non-restrictive. The scope of this application is defined by the appended claims rather than the above description, so it is intended that All changes falling within the meaning and scope of equivalent elements of the claims are included in this application.

Claims

A stylus pen, characterized in that it comprises:

main body;

A pen tip, the pen tip is arranged at one end of the main body, at least a part of the pen tip is used to contact a touch screen of an electronic device; and

The pen tip includes a first radiator, the first radiator serves as the Bluetooth radiating part and the electrode radiating part of the stylus at the same time, the first radiator is used to send and receive Bluetooth signals, and to receive or send electrodes Signal, the electrode signal is used to determine the touch position of the stylus pen by the touch screen of the electronic device.
The stylus of claim 1, wherein the stylus further comprises a Bluetooth module, and the Bluetooth module is electrically connected to the first radiator to send and receive the first radiator through the first radiator. Bluetooth signal.
The stylus according to claim 2, wherein the stylus further comprises a first isolation element, and the first isolation element is electrically connected between the first radiator and the Bluetooth module for use To prevent electrode signals from entering the Bluetooth module.
The stylus of claim 3, wherein the stylus further comprises a Bluetooth matching circuit, and the Bluetooth matching circuit is electrically connected between the second end of the first isolation element and the Bluetooth module, It is used to balance the impedance between the Bluetooth module and the first radiator.
The stylus of claim 2, wherein the stylus further comprises a control module, the control module is electrically connected to the first radiator to send or receive electrode signals through the first radiator .
8. The stylus of claim 5, wherein the stylus further comprises a second isolation element, and the second isolation element is electrically connected between the first radiator and the control module for Prevent the Bluetooth signal from entering the control module.
The stylus of claim 2, wherein the stylus further comprises a third isolating element, the first end of the third isolating element is electrically connected to the first radiator, and the third isolating element is electrically connected to the first radiator. The second end of the element is grounded, and the third isolation element is used to prevent the electrode signal from being short-circuited to the ground.
The stylus according to claim 5, wherein the first radiator includes a first power feeding part and a second power feeding part, and the Bluetooth module feeds a radio frequency signal through the first power feeding part to For the first radiator, the control module feeds a voltage signal to the first radiator through the second feeder.
The stylus according to claim 8, wherein the first radiator includes a first radiating part, and the first power feeding part and the second power feeding part are both provided in the first radiating part The first end.
The stylus of claim 9, wherein the first radiator further comprises a second radiating part, and the second end of the first radiating part is electrically connected to the first end of the second radiating part .
The stylus according to claim 10, wherein the second end of the first radiating part extends upward to form a connecting part, and the second end of the first radiating part is electrically connected to the connecting part through the connecting part. The second radiation department.
The stylus of claim 11, wherein a first opening is formed between the first end and the second end of the first radiating part, and the first end and the second end of the second radiating part are different from each other. A second opening is formed between.
The stylus of claim 12, wherein the first power feeding portion and the second power feeding portion are both disposed adjacent to the first opening.