WO2022051950A1

WO2022051950A1 - Sensor, signal detection apparatus and electronic device

Info

Publication number: WO2022051950A1
Application number: PCT/CN2020/114288
Authority: WO
Inventors: 冯林; 杨旺旺
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2022-03-17

Abstract

A sensor (31), a signal detection apparatus and an electronic device. The sensor (31) comprises: a circuit board (21), a pressure detection electrode layer (22), a capacitive touch-control electrode layer (24) for forming sensing capacitance so as to perform touch-control detection, and an isolation layer (23) for shielding, wherein the pressure detection electrode layer (22) is arranged on the circuit board (21), the capacitive touch-control electrode layer (24) is located on the side of the pressure detection electrode layer (22) that faces away from the circuit board (21), and the isolation layer (23) is located between the pressure detection electrode layer (22) and the capacitive touch-control electrode layer (24); the pressure detection electrode layer (22) comprises a driving electrode (221) and a receiving electrode (222), a coupling capacitance being formed between the driving electrode (221) and the receiving electrode (222); and when the pressure detection electrode layer (22) is deformed under pressure, a variation value of coupling capacitance is an electrical signal corresponding to the pressure. The sensor (31) has the functions of both capacitive touch-control detection and pressure detection; in addition, the volume of the sensor (31) is effectively reduced, the difficulty of assembling the sensor (31) is reduced, and the rate of touching the sensor (31) by mistake is effectively reduced on the basis of enriching the user experience.

Description

Sensors, signal detection devices and electronic equipment

technical field

The present application relates to the technical field of sensors, and in particular, to a sensor, a signal detection device, and an electronic device.

Background technique

In the application scenario of human-computer interaction, sensors are usually used to obtain user operation information, thereby realizing the user's control of the terminal device. Taking the terminal device as a wireless earphone as an example, the user controls the wireless earphone by operating the operation keys on the wireless earphone. With the development trend of miniaturization and intelligence, wireless headsets have higher and higher requirements for human-computer interaction experience.

In the human-computer interaction solutions in the prior art, capacitive touch sensors, pressure sensors, etc. are usually used alone to detect user operations. The control sensor realizes single-click, double-click, slide, long-press and other detection, obtains user operations, and then realizes human-computer interaction. A separate capacitive touch sensor is prone to false triggering when touched by a hand. The separate capacitive touch sensor and separate pressure sensor make the human-computer interaction function single, and the user experience is not good.

In the human-computer interaction solution in the prior art, the pressure sensor is bulky and difficult to assemble, and it is difficult to use the pressure sensor and the touch sensor simultaneously in a small electronic device (for example, an earphone). To achieve pressure and touch detection, the user experience is not good.

SUMMARY OF THE INVENTION

The present application provides a sensor, a signal detection device and an electronic device to partially or completely solve the technical problems existing in the prior art.

In a first aspect, an embodiment of the present application provides a sensor, including:

Circuit board, pressure detection electrode layer, capacitive touch electrode layer for forming inductive capacitance for touch detection, and isolation layer for shielding; circuit board, pressure detection electrode layer, isolation layer and capacitive touch electrode layer in sequence The pressure detection electrode layer is arranged on the circuit board, the capacitive touch electrode layer is located on the side of the pressure detection electrode layer facing away from the circuit board, and the isolation layer is located between the pressure detection electrode layer and the capacitive touch electrode layer; the pressure detection electrode The layer includes a driving electrode and a receiving electrode, and a coupling capacitance is formed between the driving electrode and the receiving electrode; when the pressure detection electrode layer is deformed under pressure, the change value of the coupling capacitance is an electrical signal corresponding to the pressure.

In the embodiment of the present application, by arranging a pressure detection electrode layer, a capacitive touch electrode layer, and an isolation layer for shielding between the pressure detection electrode layer and the capacitive touch electrode layer on the circuit board, the simultaneous capacitive touch control is realized. The integrated sensor with the pressure detection function does not need to install the pressure sensor and the touch sensor at the same time, which effectively reduces the volume of the sensor and reduces the assembly difficulty of the sensor. Moreover, by combining capacitive touch and pressure detection, the false touch rate of the sensor can be effectively reduced on the basis of enriching the user experience.

In a possible implementation manner, in the sensor provided by the embodiment of the present application, the driving electrodes and the receiving electrodes of the pressure detection electrode layer are staggered and arranged on the same plane.

In the embodiment of the present application, compared with the capacitive pressure sensor in the prior art, electrodes located on two planes are generally used. When the user presses the existing capacitive pressure sensor, the distance between the electrodes on the two planes To achieve pressure detection, in order to ensure pressure detection, there needs to be a reserved space between two planes. In the prior art, an extra bracket is usually used to realize the reserved space between the two planes. However, in the embodiment of the present application, by arranging the driving electrodes and the receiving electrodes of the pressure detection electrode layer in a staggered manner on the same plane, not only the pressure detection can be realized, but additional brackets are not required, and the cost is low and the assembly is simple.

In a possible implementation, the sensor provided by the embodiment of the present application has a plurality of driving electrodes and a plurality of receiving electrodes; a first coupling capacitance exists between adjacent driving electrodes and receiving electrodes, and the coupling The capacitance is the total capacitance of each of the first coupling capacitors.

In the embodiment of the present application, by arranging multiple driving electrodes and multiple receiving electrodes, the pressure detection accuracy of the sensor can be improved.

In a possible implementation manner, in the sensor provided by the embodiment of the present application, the isolation layer is grounded.

In a possible implementation manner, in the sensor provided by the embodiment of the present application, the capacitive touch electrode layer includes any one of a self-capacitance detection electrode layer, a mutual-capacitance detection electrode layer, or a self-interconnected detection electrode layer.

In a possible implementation manner, in the sensor provided by the embodiment of the present application, the detection electrodes in the capacitive touch electrode layer are any one of rectangular detection electrodes, circular detection electrodes, or triangular detection electrodes.

In the embodiment of the present application, by adopting a rectangular detection electrode, a circular detection electrode or a triangular detection electrode, the flexibility of designing the capacitive touch electrode layer is improved.

In a possible implementation, in the sensor provided by the embodiment of the present application, the capacitive touch electrode layer includes a first detection electrode and a second detection electrode that form mutual capacitance, and the shapes of the first detection electrode and the second detection electrode are both Right-angled triangle, the first detection electrode and the second detection electrode form a square as a whole.

In a possible implementation, in the sensor provided by the embodiment of the present application, the capacitive touch electrode layer includes a third detection electrode and a fourth detection electrode, the third detection electrode and the fourth detection electrode are located on the same plane, and the third detection electrode and the fourth detection electrodes are alternately arranged.

In a possible implementation, for the sensor provided by the embodiment of the present application, the circuit board is a printed circuit board (Printed circuit boards, PCB) or a flexible printed circuit board (Flexible Printed Circuit, FPC).

The following describes the signal detection device and the earphone provided by the embodiments of the present application. For the content and effects, reference may be made to the sensors provided by the embodiments of the present application, and details are not repeated here.

In a second aspect, an embodiment of the present application provides a signal detection device, including: a signal processing circuit and a sensor provided by the first aspect and an optional manner of the first aspect;

The sensor is connected with the signal processing circuit; the signal processing circuit is used for generating pressure information and touch information by distribution according to the coupling capacitance and the sensing capacitance.

In a third aspect, an embodiment of the present application provides an electronic device, including: the signal detection apparatus provided in the second aspect and an optional manner of the second aspect.

In one possible embodiment, the sensor is located on the stem of the earphone.

The sensor, signal detection device and electronic equipment provided by the present application include: a circuit board, a pressure detection electrode layer, a capacitive touch electrode layer for forming an inductive capacitance for touch detection, and an isolation layer for shielding; pressure detection The electrode layer is arranged on the circuit board, the capacitive touch electrode layer is located on the side of the pressure detection electrode layer facing away from the circuit board, and the isolation layer is located between the pressure detection electrode layer and the capacitive touch electrode layer; the pressure detection electrode layer includes driving electrodes A coupling capacitance is formed between the driving electrode and the receiving electrode; when the pressure detection electrode layer is deformed under pressure, the change value of the coupling capacitance is an electrical signal corresponding to the pressure. In the embodiment of the present application, by arranging a pressure detection electrode layer, a capacitive touch electrode layer, and an isolation layer for shielding between the pressure detection electrode layer and the capacitive touch electrode layer on the circuit board, the simultaneous capacitive touch control is realized. It is an integrated sensor with pressure detection function, and does not need to install a pressure sensor and a touch sensor at the same time, which effectively reduces the volume of the sensor and reduces the assembly difficulty of the sensor. Moreover, by combining capacitive touch and pressure detection, the false touch rate of the sensor can be effectively reduced on the basis of enriching the user experience.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is an exemplary application scenario diagram provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a sensor provided by an embodiment of the present application;

3 is a schematic top view of a pressure detection electrode layer provided by an embodiment of the present application;

FIG. 4 and FIG. 5 are schematic diagrams of the working principle of the pressure detection electrode layer provided by an embodiment of the present application;

6 is a schematic structural diagram of a capacitive touch electrode layer provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a capacitive touch electrode layer provided by another embodiment of the present application;

FIG. 8 is a schematic structural diagram of a capacitive touch electrode layer provided by another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a signal detection apparatus provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of an earphone provided by an embodiment of the present application.

Description of reference numbers:

11: wireless headset;

12: sensor;

13: finger;

21: circuit board;

22: pressure detection electrode layer;

221: drive electrode;

222: receiving electrode;

23: isolation layer;

24: capacitive touch electrode layer;

31: sensor;

32: signal processing circuit;

33: control module;

71: the first detection electrode;

72: the second detection electrode;

81: the third detection electrode;

82: Fourth detection electrode.

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

The concept of the sensor, the signal detection device and the electronic device provided by the embodiments of the present application is that by setting the sensor with integrated capacitive touch and pressure detection functions, it is avoided to install the pressure sensor and the touch sensor at the same time, and the volume of the sensor is effectively reduced, And reduce the assembly difficulty of the sensor. Moreover, by combining capacitive touch and pressure detection, on the basis of enriching the user experience, the false touch rate of the sensor is effectively reduced.

Hereinafter, exemplary application scenarios of the embodiments of the present application are introduced.

The sensors and signal detection devices provided in the embodiments of the present application can be applied to electronic devices, where the electronic devices may be mobile terminals or other terminals that can be touched, such as smartphones, cameras, tablet computers, household appliances, wearable devices, etc. The device, for example, the electronic device may be the earphone provided by the embodiment of the present application. FIG. 1 is an exemplary application scenario diagram provided by an embodiment of the present application. As shown in FIG. 1 , the sensor or signal detection device provided by the embodiment of the present application may be applied to a wireless earphone 11 . The wireless earphone 11 includes a sensor 12 , and the sensor 12 is arranged on the rod of the wireless earphone 11, and the user can press the sensor 12 with the finger 13, so that the integrated sensor 12 can generate both capacitive touch signals and pressure signals, and the signal processing circuit performs corresponding processing to obtain the processing result. For example, when it is detected that an external object touches the earphone and the touch pressure reaches a certain value at the same time, it can be concluded that the touch is not a false touch by an external object, but the user needs to operate the earphone, and then the controller of the wireless earphone can be activated. Generate control instructions according to the processing results, for example, start playing, pause playing, etc., so that the control circuit of the wireless headset controls the wireless headset according to the user's operation. Not limited to this.

FIG. 2 is a schematic structural diagram of a sensor provided by an embodiment of the present application. As shown in FIG. 2 , the sensor provided by the embodiment of the present application may include:

Circuit board 21 , pressure detection electrode layer 22 , capacitive touch electrode layer 24 for forming inductive capacitance for touch detection, and isolation layer 23 for shielding; circuit board 21 , pressure detection electrode layer 22 , isolation layer 23 and the capacitive touch electrode layer 24 are arranged in sequence, the pressure detection electrode layer 22 is arranged on the circuit board 21, the capacitive touch electrode layer is located on the side of the pressure detection electrode layer facing away from the circuit board, the isolation layer is located on the pressure detection electrode layer and the capacitor between the touch electrode layers. For example, when the entire sensor is arranged horizontally, the circuit board, the pressure detection electrode layer, the isolation layer and the capacitive touch electrode layer are arranged in sequence from bottom to top. The layers and the capacitive touch electrode layer are sequentially arranged from the inside to the outside, so that the capacitive touch electrode layer is located outside the electronic device where the sensor is located, so that the capacitive touch sensor is located closer to the user.

The pressure detection electrode layer 22 includes a driving electrode 221 and a receiving electrode 222, and a coupling capacitance is formed between the driving electrode 221 and the receiving electrode 222; when the pressure detection electrode layer 22 is deformed under pressure, the change value of the coupling capacitance corresponds to the pressure electric signal. The integrated sensor provided by the present application can realize capacitive pressure detection and capacitive touch detection at the same time by arranging two layers of electrode layers and one layer of isolation layer on one circuit board, so that the overall structure of the sensor is simple and the volume is relatively small. Small, low cost and easy to install.

The circuit board is used to support the pressure detection electrode layer of the sensor, and is the carrier for the electrical connection of the electronic components in the sensor. The embodiment of the present application does not limit the specific type of the circuit board. In a possible implementation manner, the circuit board may be a PCB, and in this embodiment of the present application, a pressure detection electrode layer is provided on the PCB. PCB is a circuit board commonly used in electronic structures. By using PCB as a circuit board, the versatility of the sensor can be improved. In another possible implementation manner, the circuit board may be an FPC, and the pressure detection electrode layer is arranged on the FPC in this embodiment of the present application. It is conducive to the deformation of the pressure detection electrode layer under the action of external force and the recovery of the original state when the external force disappears, so as to improve the flexibility of the sensor and the accuracy of pressure detection, further reduce the volume of the sensor, and provide the possibility for the sensor to be applied to small electronic devices. , For example, applying sensors to small electronic devices such as earphones, sports bracelets, and electronic watches to save the space of electronic devices.

A pressure detection electrode layer is arranged on the circuit board, the pressure detection electrode layer includes a driving electrode and a receiving electrode, and a coupling capacitance exists between the driving electrode and the receiving electrode. By detecting the change of the coupling capacitance, the user's pressing information on the sensor can be obtained.

In a possible implementation manner, the driving electrodes and the receiving electrodes of the pressure detection electrode layer are staggered and arranged on the same plane. In the embodiment of the present application, compared with the capacitive pressure sensor in the prior art that generally uses electrodes located on two planes, when the user presses the existing capacitive pressure sensor, the distance between the electrodes on the two planes decreases. small to achieve pressure detection. In order to ensure the detection of the pressure, a space needs to be reserved between the two planes, and an extra bracket is usually used in the prior art to realize the reserved space between the two planes. However, in the embodiment of the present application, by arranging the driving electrodes and the receiving electrodes of the pressure detection electrode layer on the same plane and staggered, not only the pressure detection can be realized, but also an additional bracket is not required, and there is no need to use two layers. Space is reserved between the electrodes, so that the cost is lower, the space is saved, and the assembly is simple, and the staggered arrangement of the electrodes for pressure detection on the same plane can make the detection accuracy higher.

For ease of introduction, FIG. 3 is a schematic top view of the pressure detection electrode layer provided by an embodiment of the present application. With reference to FIGS. 2 and 3 , the driving electrodes 221 and the receiving electrodes 222 are staggered on the same plane. There is no limit to the number of receiving electrodes. In a possible implementation manner, the number of driving electrodes is one or more, and the number of receiving electrodes is one or more. If both the number of driving electrodes and the number of receiving electrodes are multiple, among the multiple driving electrodes and the multiple receiving electrodes, there is a first coupling capacitance between the adjacent driving electrodes and the receiving electrodes, and the coupling capacitance is each first coupling The total capacitance of the capacitors.

By arranging multiple driving electrodes and multiple receiving electrodes, the detection accuracy of the pressure signal by the sensor can be improved. In the same area of the pressure detection electrode layer, the smaller the width and spacing between the driving electrodes and the receiving electrodes, the more the number of driving electrodes and receiving electrodes can be set, and the detection accuracy of the sensor can be further improved. In a possible implementation manner, the width of the driving electrode and the receiving electrode may be 60 micrometers (μm), and the distance between the driving electrode and the receiving electrode may be set to 60 μm. limited to this.

In order to improve the efficiency of detecting the coupling capacitance, in a possible implementation, a plurality of driving electrodes are connected, and a plurality of receiving electrodes are connected. By connecting multiple driving electrodes and multiple receiving electrodes, the total capacitance of each first coupling capacitor can be directly detected without first detecting each first coupling capacitor and then calculating the total capacitance of each first coupling capacitor.

There is a coupling capacitance between the driving electrode and the receiving electrode of the pressure detection electrode layer. When the pressure detection electrode layer is deformed under pressure, the change value of the coupling capacitance is an electrical signal corresponding to the pressure. For ease of introduction, FIG. 4 and FIG. 5 are schematic diagrams of the working principle of the pressure detection electrode layer provided by an embodiment of the present application. As shown in FIG. 4 and FIG. 5 , the pressure detection electrode layer 22 includes a plurality of driving electrodes 221 and In the receiving electrode 222, there is a coupling capacitance between the adjacent driving electrodes and the receiving electrodes. In FIG. 4 and FIG. 5, the pressure detection electrode layer includes 4 driving electrodes and 4 receiving electrodes as an example to illustrate, from left to right ( The arrow indicates the direction), there is a first coupling capacitance C1 between the first driving electrode and the first receiving electrode, a first coupling capacitance C2 exists between the first receiving electrode and the second driving electrode, and so on, and finally A first coupling capacitance Cn exists between one driving electrode and the last receiving electrode, and the distance between adjacent driving electrodes and receiving electrodes is, for example, d. When the user presses the sensor, as shown in Figure 5, the pressure detection electrode layer of the sensor is deformed, and the distance between the adjacent driving electrodes and the receiving electrodes increases by Δd. The coupling capacitance is inversely proportional to the distance d between the driving electrode and the receiving electrode. As d increases, the first coupling capacitance between the driving electrode and the receiving electrode decreases. A second coupling capacitance exists between adjacent driving electrodes and receiving electrodes. For example, the second coupling capacitance C1-ΔC1 exists between the first driving electrode and the first receiving electrode, and the second coupling capacitance C2-ΔC2 exists between the first receiving electrode and the second driving electrode, so that By analogy, the second coupling capacitance existing between the last driving electrode and the last receiving electrode is Cn-ΔCn.

The electrical signal corresponding to the pressure value is the change value of the coupling capacitance, then the change value of the coupling capacitance is the difference between the coupling capacitance after deformation and the coupling capacitance, and the coupling capacitance is the total capacitance of each first coupling capacitance, and the coupling capacitance after deformation The capacitance is the total capacitance of each of the second coupling capacitors. Taking the embodiments shown in FIG. 4 and FIG. 5 as an example, that is, the change value of the coupling capacitance is ΔC1+ΔC2+...+ΔCn, and the embodiment of the present application only takes this as an example.

The sensor provided by the embodiment of the present application further includes a capacitive touch electrode layer, and the capacitive touch electrode layer is used to form an inductive capacitance to detect the user's touch, slide and other operations on the sensor, thereby enriching the functions of the sensor. Compared with the capacitive touch module in the prior art, it has the defect that it is easy to be touched by the user, resulting in false triggering. The sensor provided by the embodiment of the present application can perform user operations by combining the coupling capacitance and the sensing capacitance, and cooperate with the signal processing circuit. Judgment, effectively reduce the false touch rate. In addition, by integrating the capacitive touch electrode layer, the isolation layer, and the pressure detection electrode layer on the circuit board through the sensor provided by the embodiment of the present application, not only can the pressure touch and capacitive touch be detected at the same time to realize the pressure touch, and the cost is also low. Low and simple to assemble, it can be used in small electronic devices, such as wireless earphones, etc.

The embodiments of the present application do not limit the specific structure of the capacitive touch electrode layer. In a possible implementation manner, the capacitive touch electrode layer may be a self-capacitance detection electrode layer, a mutual capacitance detection electrode layer, or a self-interacting integrated detection electrode. any of the layers. Among them, the self-capacitance refers to the capacitance formed by the detection electrode and the ground. When the user touches, a parallel capacitance will be added, so that the capacitance of the self-capacitance detection electrode layer changes. By using the self-capacitance detection electrode layer, the number of detection electrodes can be reduced. save costs. Mutual capacitance refers to the capacitance formed by two electrodes (one as the transmitting electrode and the other as the receiving electrode). Scanning the capacitance change at each intersection can be used to determine the position of the touch point. By using the mutual capacitance detection electrode layer, the accuracy of capacitive touch detection can be improved, and the interference of sweat and temperature can be better reduced. In the self-interconnected detection electrode layer, self-capacitance and mutual capacitance can be formed at the same time. By using the self-interconnected detection electrode layer, it can be used in various application scenarios and has stronger adaptability.

In order to detect the user's sliding operation on the sensor through the capacitive touch electrode layer, in a possible implementation manner, the detection electrodes in the capacitive touch electrode layer can be arranged in multiple rows and columns; or, in the capacitive touch electrode layer The detection electrodes can also be arranged in a row or a column. The embodiment of the present application is only an example and is not limited to this. In addition, the embodiment of the present application does not limit the shape of the detection electrode. For example, the detection electrode may be a rectangular detection electrode, a triangular detection electrode, or a circular detection electrode, etc. , by adopting rectangular detection electrodes, circular detection electrodes or triangular detection electrodes, the flexibility of designing the capacitive touch electrode layer is improved.

The sensor provided by the embodiment of the present application further includes an isolation layer for shielding between the pressure detection electrode layer and the capacitive touch electrode layer, and the isolation layer is used to shield the body part from the pressure detection electrode layer when the body part presses the sensor. The generated inductive capacitance can further ensure the accuracy of the coupling capacitance in the pressure detection electrode layer. Wherein, the isolation layer may be a conductive isolation layer, and the charges generated when the user touches are released through the conductive isolation layer. The embodiment of the present application does not limit the specific material of the isolation layer, for example, the conductor may be metal copper.

In the embodiment of the present application, by arranging a pressure detection electrode layer, a capacitive touch electrode layer, and an isolation layer for shielding between the pressure detection electrode layer and the capacitive touch electrode layer on the circuit board, it is realized that the sensor has a capacitive touch sensor at the same time. The functions of control and pressure detection are realized, and the pressure sensor and the touch sensor do not need to be installed at the same time, which effectively reduces the volume of the sensor and reduces the assembly difficulty of the sensor. Moreover, by combining capacitive touch and pressure detection, on the basis of enriching the user experience, the false touch rate of the sensor is effectively reduced.

In a possible implementation, FIG. 6 is a schematic structural diagram of a capacitive touch electrode layer provided by an embodiment of the present application. As shown in FIG. 6 , the capacitive touch electrode layer may be a self-capacitance touch electrode layer, as shown in FIG. 6 . In the above description, the capacitive touch electrode layer includes four detection electrodes as an example for description, and the embodiments of the present application do not limit the number and shape of the detection electrodes to this. Detection electrode 1, detection electrode 2, detection electrode 3 and detection electrode 4 are located on the same plane. When the user touches the capacitive touch electrode layer with a finger, the detection electrode at the touch position of the finger generates an inductive capacitance with the human body. The size of the inductive capacitance and the change of the inductive capacitance can determine the operation of the sensor by the user, wherein the inductive capacitance includes the inductive capacitance of a plurality of detection electrodes. For example, as shown in Figure 6, the user's finger slides from the detection electrode 1, through the detection electrode 2 and the detection electrode 3 to the detection electrode 4, when the user's finger slides from the detection electrode 1 to the detection capacitor 2, the sensing capacitance of the detection electrode 1 is determined by When the user's finger slides from the detection electrode 2 to the detection electrode 3, the inductive capacitance of the detection electrode 2 changes from large to small, and the inductive capacitance of the detection electrode 3 changes from small to large. , when the user's finger slides from the detection electrode 3 to the detection electrode 4 , the inductive capacitance of the detection electrode 3 changes from large to small, and the inductive capacitance of the detection electrode 4 changes from small to large. In the embodiment of the present application, by outputting the sensing capacitance to the signal processing circuit, and detecting the sensing capacitance of the plurality of detection electrodes in the sensing capacitance through the signal processing circuit, it can be determined whether the user has a sliding operation on the sensor. The embodiments of the present application are only taken as an example, and are not limited thereto.

In another possible implementation, the capacitive touch electrode layer includes a first detection electrode and a second detection electrode that form mutual capacitance, the first detection electrode and the second detection electrode form a square as a whole, and the first detection electrode and the second detection electrode form a square as a whole. The shapes of the detection electrodes are all right triangles, and the hypotenuse of the first detection electrode is opposite to the hypotenuse of the second detection electrode. For ease of introduction, FIG. 7 is a schematic structural diagram of a capacitive touch electrode layer provided by another embodiment of the present application. As shown in FIG. 7 , the capacitive touch electrode layer may be a self-integrated detection electrode layer, wherein the first detection electrode 71 is the detection electrode A, and the second detection electrode 72 is the detection electrode B. The inductive capacitance may include the inductive capacitance of the detection electrode A, the inductive capacitance of the detection electrode B, and may also include the capacitance signals of the detection electrode A and the detection electrode B. The embodiments of the present application do not limit the shape and number of the detection electrodes to this. Taking the user's finger sliding on the sensor from right to left (in the direction of the arrow shown in Figure 7) as an example, when the finger is close to the right side, the sensing capacitance of the detection electrode B is greater than that of the detection electrode A. As the finger slides to the left, The inductive capacitance of the detection electrode B gradually decreases, the inductive capacitance of the detection electrode A gradually increases, and the inductive capacitance of the detection electrode A gradually becomes larger than the inductive capacitance of the detection electrode B. In the embodiment of the present application, by outputting the sensing capacitance to the signal processing circuit, and detecting the sensing capacitance of the plurality of detection electrodes in the sensing capacitance through the signal processing circuit, it can be determined whether the user has a sliding operation on the sensor. The embodiments of the present application are only taken as an example, and are not limited thereto.

In the embodiment of the present application, by using the first detection electrode and the second detection electrode that form mutual capacitance, and the shapes of the first detection electrode and the second detection electrode are both right-angled triangles, the first detection electrode and the second detection electrode are integrally formed. The square shape is conducive to the detection of the user's touch point and the user's sliding operation.

In another possible implementation manner, in the sensor provided by the embodiment of the present application, the capacitive touch electrode layer includes a third detection electrode and a fourth detection electrode, and the third detection electrode and the fourth detection electrode are arranged alternately.

FIG. 8 is a schematic structural diagram of a capacitive touch electrode layer provided by another embodiment of the present application. As shown in FIG. 8 , the capacitive touch electrode layer includes four sets of detection electrodes, which are detection electrodes M, detection electrodes N, and detection electrodes P, respectively. and the detection electrode Q, the sensing capacitance includes the capacitance signal of the detection electrode M, the capacitance signal of the detection electrode N, the capacitance signal of the detection electrode P and the capacitance signal of the detection electrode Q, and each group of detection electrodes includes the staggered third detection electrodes 81 and The fourth detection electrode 82, when the user's finger slides from right to left (the direction indicated by the arrow in FIG. 8), outputs the inductive capacitance to the signal processing circuit, and detects the capacitance signals of the plurality of detection electrodes in the inductive capacitance through the signal processing circuit , the user's swipe operation on the sensor can be determined. The embodiments of the present application are only taken as an example, and are not limited thereto.

In the embodiment of the present application, the capacitive touch electrode layer includes the third detection electrode and the fourth detection electrode which are located on the same plane and arranged in a staggered manner, which not only saves the space of the capacitive touch electrode layer, but also saves the space of the sensor. The plurality of staggered third detection electrodes and fourth detection electrodes can also improve the detection accuracy of the capacitive touch electrode layer.

An embodiment of the present application provides a signal detection device. FIG. 9 is a schematic structural diagram of the signal detection device provided by an embodiment of the present application. As shown in FIG. 9 , the signal processing circuit 32 of the signal detection device provided by the embodiment of the present application and the The sensor 31 provided in the above embodiment; the sensor 31 is connected to the signal processing circuit 32; the signal processing circuit 32 is used to generate pressure information and touch information respectively according to the coupling capacitance and the sensing capacitance.

The signal detection device provided by the embodiment of the present application sends the coupling capacitance and the sensing capacitance of the pressure detection electrode layer to the signal processing circuit through the sensor, and the signal processing circuit generates pressure information and touch information according to the coupling capacitance and the sensing capacitance. Wherein, the pressure information may include the magnitude of the pressure, the time of pressing, the number of times of pressing, etc., and the touch information may include the touch position, the touch time, the touch track, etc. The embodiment of the present application is only an example, and is not limited to this.

An embodiment of the present application provides an earphone. FIG. 10 is a schematic structural diagram of the earphone provided by an embodiment of the present application. As shown in FIG. 10 , the earphone provided by the embodiment of the present application includes the signal detection device provided by the embodiment of the present application.

The signal detection device includes a sensor 31 and a signal processing circuit 32 , and the earphone includes an earphone stem 111 (also called the stem of the earphone) and an earphone head 112 . By arranging the signal detection device in the earphone, the user can touch the earphone.

In a possible implementation manner, the sensor 31 is located at the position of the earphone handle 111 of the earphone, which facilitates the user's touch operation on the sensor and improves the user experience.

The earphone may further include a control module 33, which is connected to the signal processing circuit 32, and is used for generating a control signal according to the pressure information and the touch information, so as to control the earphone.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. Scope.

Claims

A sensor, characterized in that it includes:

a circuit board, a pressure detection electrode layer, a capacitive touch electrode layer for forming an inductive capacitance for touch detection, and an isolation layer for shielding;

The circuit board, the pressure detection electrode layer, the isolation layer and the capacitive touch electrode layer are arranged in sequence, the pressure detection electrode layer is arranged on the circuit board, and the capacitive touch electrode layer is located under the pressure the side of the detection electrode layer facing away from the circuit board, the isolation layer is located between the pressure detection electrode layer and the capacitive touch electrode layer;

The pressure detection electrode layer includes a driving electrode and a receiving electrode, and a coupling capacitance is formed between the driving electrode and the receiving electrode; when the pressure detection electrode layer is deformed under pressure, the change value of the coupling capacitance is: The electrical signal corresponding to the pressure.
The sensor of claim 1, wherein:

The driving electrodes and the receiving electrodes of the pressure detection electrode layer are arranged alternately on the same plane.
The sensor according to claim 2, wherein the number of the driving electrodes is multiple, and the number of the receiving electrodes is multiple;

A first coupling capacitance exists between the adjacent driving electrodes and the receiving electrodes, and the coupling capacitance is the total capacitance of each of the first coupling capacitances.
The sensor according to any one of claims 1-3, wherein the isolation layer is grounded.
The sensor according to claim 4, wherein the capacitive touch electrode layer comprises any one of a self-capacitance detection electrode layer, a mutual-capacitance detection electrode layer, or a self-mutual integrated detection electrode layer.
The sensor according to claim 5, wherein the detection electrodes in the capacitive touch electrode layer are any one of rectangular detection electrodes, circular detection electrodes or triangular detection electrodes.
The sensor according to claim 5, wherein the capacitive touch electrode layer comprises a first detection electrode and a second detection electrode that form mutual capacitance, and the shapes of the first detection electrode and the second detection electrode are Both are right-angled triangles, and the first detection electrode and the second detection electrode form a square as a whole.
The sensor according to claim 5, wherein the capacitive touch electrode layer comprises a third detection electrode and a fourth detection electrode, the third detection electrode and the fourth detection electrode are located on the same plane and the third detection electrode The detection electrodes and the fourth detection electrodes are staggered.
The sensor according to any one of claims 1-3, wherein the circuit board is a printed circuit board (PCB) or a flexible printed circuit board (FPC).
A signal detection device, comprising: a signal processing circuit and the sensor according to any one of claims 1-9;

the sensor is connected to the signal processing circuit;

The signal processing circuit is configured to generate pressure information and touch information according to the coupling capacitance and the sensing capacitance, respectively.
An electronic device, characterized by comprising: the signal detection device according to claim 10 .
The electronic device according to claim 11, wherein the electronic device is an earphone, and the sensor is located on a rod portion of the earphone.