Push switch based on piezoelectric ceramics and touch electronic pen

Abstract

The pressing switch comprises a shell, a pressing piece, a piezoelectric ceramic piece and a first PCB, the piezoelectric ceramic piece is located in the shell, the piezoelectric ceramic piece is provided with a first face and a second face which are opposite in the first direction, the first face is connected with the other end of the pressing piece, and the second face is connected with the other end of the pressing piece. The second surface is provided with a first electrode and a second electrode; the first PCB is located in the shell and fixedly connected with the second face of the piezoelectric ceramic piece, the edge part of the first PCB is installed on the shell, and the middle part of the first PCB can deform in the first direction. According to the electronic pen, the pressing switch with the piezoelectric ceramic piece is adopted, and the piezoelectric ceramic piece is fixed to the first PCB, so that compared with the prior art that a switch with a light touch key is used for triggering the electronic pen to work, the strength of the piezoelectric ceramic piece and the strength of the first PCB are utilized, the strength of the whole piezoelectric ceramic piece is improved, and the electronic pen is more convenient to use. And the service lives of the push switch and the electronic pen are effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of touch control devices, and in particular to a push switch and a touch control electronic pen based on piezoelectric ceramics. Background Art

[0002] With the advancement of modern conferences, teaching and communications, touch control technology has been increasingly widely used in all walks of life, especially in the field of education, such as electronic pens used in electronic blackboards.

[0003] In the related art, a switch with a light touch button is generally used to trigger the electronic pen to work. However, the life of the light touch button is generally 100,000 to 150,000 times, but the number of times the electronic pen is pressed is much higher than 100,000 times, and the service life of the light touch button is limited. Therefore, it is necessary to provide a new switch structure with a longer service life. Summary of the invention

[0004] The embodiments of the present application provide a piezoelectric ceramic-based push switch and a touch-controlled electronic pen, which are used to improve the problem of short service life of a touch-button switch when a switch with a touch-button is used to trigger the operation of an electronic pen in the related art.

[0005] In a first aspect, an embodiment of the present application provides a push switch based on piezoelectric ceramics, comprising:

[0006] A shell body, wherein the interior of the shell body is hollow, and the shell body is provided with an opening in a first direction, and the opening is communicated with the interior of the shell body;

[0007] A pressing piece, the pressing piece is located in the shell and one end of the pressing piece protrudes from the opening;

[0008] A piezoelectric ceramic sheet, the piezoelectric ceramic sheet is located in the housing, the piezoelectric ceramic sheet has a first surface and a second surface opposite to each other along a first direction, the first surface is connected to the other end of the pressing member, and the second surface has a first electrode and a second electrode;

[0009] The first PCB board is located in the shell and is fixedly connected to the second surface of the piezoelectric ceramic sheet. The edge portion of the first PCB board is installed on the shell. The middle portion of the first PCB board can be deformed in a first direction. The shell has an avoidance space inside for avoiding the deformation of the middle portion.

[0010] In some embodiments, the push switch also includes two electrical connection connectors, which are arranged inside the shell, and the first PCB board has a conductive surface that faces away from the piezoelectric ceramic sheet along the first direction, and the conductive surface has two solder pads that are respectively conductive to the first electrode and the second electrode of the second surface, and the two solder pads are respectively fitted with the two corresponding electrical connection connectors.

[0011] In some embodiments, it also includes:

[0012] The second PCB board is located in the shell. Along the first direction, one end of the two electrical connection joints are electrically connected to the piezoelectric ceramic sheet via the pad, and the other end of the electrical connection joints are electrically connected to the second PCB board.

[0013] In some of the embodiments, the edge portion of the first PCB board has at least one limiting block, and the shell is correspondingly provided with a limiting groove, and the limiting block is embedded in the corresponding limiting groove.

[0014] In some of the embodiments, the first PCB board is provided with a plurality of limit blocks, and the plurality of limit blocks are all embedded in the corresponding limit grooves, at least one limit block is fixedly connected to the limit groove, and a gap G1 is provided between the side of the remaining limit blocks facing away from the piezoelectric ceramic sheet along the first direction and the limit groove, and satisfies: 0.1mm≤G1≤0.4mm.

[0015] In some embodiments, along the first direction, the thickness of the piezoelectric ceramic sheet is greater than or equal to 0.1 mm and less than or equal to 0.3 mm;

[0016] And / or, along the first direction, the thickness of the first PCB board is greater than or equal to 0.4 mm and less than or equal to 1 mm.

[0017] In some embodiments, the push switch also includes a transistor and a controller, the control electrode of the transistor is connected to the first electrode, the second electrode is grounded, the first electrode of the transistor is grounded, the second electrode of the transistor is connected to the working voltage, the second electrode outputs a high level or a low level signal, and the controller is connected to the second electrode and is configured to make a press judgment based on the level signal.

[0018] In some embodiments, the push switch also includes a capacitor, a first resistor and a second resistor, the first end of the capacitor is connected to the control electrode, the second end of the capacitor is grounded, the first end of the first resistor is connected to the control electrode, the second end of the first resistor is grounded, the first end of the second resistor is connected to the second electrode of the transistor, and the second end of the second resistor is connected to the working voltage.

[0019] In some of the embodiments, the push switch further includes a Zener diode, a cathode of the Zener diode is connected to the control electrode, and an anode of the Zener diode is grounded.

[0020] In a second aspect, an embodiment of the present application provides a touch electronic pen, including a pen tip and the above-mentioned push switch, wherein the pressing member of the push switch is the pen tip.

[0021] The piezoelectric ceramic-based push switch and touch-controlled electronic pen of the embodiment of the present application adopt a push switch with a piezoelectric ceramic sheet and fix the piezoelectric ceramic sheet to the first PCB board. Compared with the use of a switch with a light touch button to trigger the electronic pen to work in the related art, the strength of the piezoelectric ceramic sheet itself and the strength of the first PCB board are used to increase the strength of the overall piezoelectric ceramic sheet. In this way, the piezoelectric ceramic sheet is not easily damaged when the pressing member acts, which effectively increases the service life of the push switch.

[0022] In the embodiment of the present application, along the first direction, an avoidance space is provided inside the shell when the middle part of the first PCB board is deformed. In this way, when the pressing member acts, the piezoelectric ceramic sheet fixed on the first PCB board has sufficient deformation space, that is, the piezoelectric ceramic sheet can produce a sufficiently large deformation amount, thereby generating a voltage signal that meets the preset voltage. An electronic switch signal can be obtained without the use of an additional operational amplifier, which can effectively reduce the power consumption of the press switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a schematic structural diagram of a piezoelectric ceramic-based push switch provided in an embodiment of the present application;

[0025] Figure 2 yes Figure 1 A partial cross-sectional structural schematic diagram of a push switch is shown;

[0026] Figure 3 yes Figure 1 A partial structural schematic diagram of a push switch is shown;

[0027] Figure 4 yes Figure 1 A schematic diagram of a partial top view of the push switch is shown;

[0028] Figure 5 yes Figure 1 The structural schematic diagram of the piezoelectric ceramic sheet shown;

[0029] Figure 6 yes Figure 1 The structural schematic diagram of the piezoelectric ceramic sheet welded to the first PCB board is shown;

[0030] Figure 7 is a partial structural diagram of a push switch in another embodiment provided in the embodiment of the present application;

[0031] Figure 8 It is a schematic diagram of a processing circuit for a voltage signal generated by a piezoelectric ceramic sheet provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10. Press the switch;

[0034] 11. housing; 111. opening; 112. avoidance space; 113. limiting groove; 114. electrical connection connector;

[0035] 12. piezoelectric ceramic sheet; 121. first surface; 122. second surface; 123. first electrode; 124. second electrode;

[0036] 13. First PCB board; 131. First conducting surface; 132. Solder pad; 133. Limiting block; 134. Second conducting surface;

[0037] 14. Pressing piece;

[0038] 15. Second PCB board;

[0039] 16. transistor; 161. control electrode; 162. first electrode; 163. second electrode;

[0040] x, first direction. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0043] First, see Figures 1 to 4The embodiment of the present application provides a piezoelectric ceramic-based push switch 10 , including a housing 11 , a piezoelectric ceramic sheet 12 , a first PCB board 13 and a pressing member 14 . The shell 11 is hollow inside, and an opening 111 is provided in the shell 11 in the first direction x, and the opening 111 is connected to the inside of the shell 11. The pressing piece 14 is located in the shell 11 and one end protrudes from the opening 111; the piezoelectric ceramic piece 12 is located in the shell 11, and the piezoelectric ceramic piece 12 has a first surface 121 and a second surface 122 opposite to each other along the first direction x, the first surface 121 has a first electrode 123 and is connected to the other end of the pressing piece 14, and the second surface 122 has a first electrode 123 and a second electrode 124; the first PCB board 13 is located in the shell 11 and is fixedly connected to the second surface 122 of the piezoelectric ceramic piece 12, the edge portion of the first PCB board 13 is installed on the shell 11, the middle portion of the first PCB board 13 can be deformed in the first direction x, and the shell 11 has an avoidance space 112 for avoiding when the middle portion of the first PCB board 13 is deformed.

[0044] The piezoelectric ceramic-based push switch 10 of the embodiment of the present application adopts a push switch 10 with a piezoelectric ceramic sheet 12, and fixes the piezoelectric ceramic sheet 12 to a first PCB board 13. Compared with the use of a switch with a light touch button to trigger the operation of the electronic pen in the related art, the strength of the piezoelectric ceramic sheet 12 itself and the strength of the first PCB board 13 are used to increase the strength of the overall piezoelectric ceramic sheet 12. In this way, the piezoelectric ceramic sheet 12 is not easily damaged when the pressing member 14 acts, thereby effectively improving the service life of the push switch 10.

[0045] In the present application embodiment, refer again to Figure 2 and Figure 3 Along the first direction x, an avoidance space 112 is provided inside the housing 11 for the middle portion of the first PCB board 13 to be deformed. Thus, when the pressing member 14 is pressed, the piezoelectric ceramic piece 12 fixed on the first PCB board 13 has sufficient deformation space, that is, the piezoelectric ceramic piece 12 can produce a sufficiently large deformation amount, thereby generating a voltage signal that meets the preset voltage. An electronic switch signal can be obtained without the use of an additional operational amplifier, thereby effectively reducing the power consumption of the push switch 10.

[0046] In addition, the piezoelectric ceramic piece 12 has a simple structure, high energy conversion efficiency, no theoretical life limit, and does not use system power supply. It can generate electrical signals by itself, which can save system power of the push switch 10. Moreover, since it occupies a small space, it is very convenient to install and use.

[0047] Specifically, along the first direction x, when the end of the pressing member 14 protruding from the opening 111 is pressed, the piezoelectric ceramic sheet 12 abutting against the other end of the pressing member 14 is pressed by the pressing member 14, thereby driving the first PCB board 13 fixedly connected to the piezoelectric ceramic sheet 12 to deform in the avoidance space 112 inside the housing 11. In this way, the piezoelectric ceramic sheet 12 deforms along with the first PCB board 13 in the first direction x, and a voltage signal of a preset voltage can be generated between the first electrode 123 and the second electrode 124 on the second surface 122 of the first PCB board 13, thereby enabling the press switch 10 to drive the electronic pen to work normally. The following description assumes that the preset voltage is greater than 1V.

[0048] It should be noted that the piezoelectric ceramic sheet 12 in the embodiment of the present application is a flanged piezoelectric ceramic sheet. Figures 5 and 6 , from left to right are the rear view, side view and front view. The first surface 121 of the flanged piezoelectric ceramic sheet has a first electrode 123, and the second surface 122 has a first electrode 123 and a second electrode 124. The first electrode 123 of the first surface 121 and the first electrode 123 of the second surface 122 can be formed by the same electrode through a flanging process, so that a part of the same electrode is located on the first surface 121, and the other part extends to the second surface 122. The second surface 122 of the piezoelectric ceramic sheet 12 is connected to the first PCB board 13, so that the first PCB board 13 is away from the side of the piezoelectric ceramic sheet 12, and the signals of the first electrode 123 and the second electrode 124 in the piezoelectric ceramic sheet 12 can be conducted. It should be noted that the piezoelectric ceramic sheet 12 and the first PCB board 13 can be soldered by solder paste, which is not limited to this.

[0049] See again Figures 2 to 4The push switch 10 further includes two electrical connection joints 114, which are arranged inside the housing 11. The first PCB board 13 has a first conductive surface 131 facing the piezoelectric ceramic sheet 12 and a second conductive surface 134 away from the piezoelectric ceramic sheet 12 along the first direction x. The first conductive surface 131 has two pads 132 that are respectively connected to the first electrode 123 and the second electrode 124 of the second surface 122 of the piezoelectric ceramic sheet 12, and the two pads 132 are respectively welded to the first electrode 123 and the second electrode 124. The first PCB board 13 also has a through hole that penetrates the first conductive surface 131 and the second conductive surface 134 along the first direction x. After the electrical connection joint 114 is inserted into the through hole, it abuts against the corresponding pad 132, so that the first electrode 123 is connected to the corresponding electrical connection joint 114 through one pad 132, and the second electrode 124 is connected to the corresponding electrical connection joint 114 through the other pad 132. By providing two pads 132 corresponding to the first electrode 123 and the second electrode 124 on the first PCB board 13, the two electrical connection connectors 114 attached to the first PCB board 13 can respectively output the signals of the first electrode 123 and the second electrode 124 through the pads 132, thereby realizing the transmission of electrical signals between the piezoelectric ceramic sheet 12 and the electrical connection connectors 114. Compared with the related art of transmitting electrical signals by welding wires to the piezoelectric ceramic sheet 12, there is no need to worry about the problem of the welding wire being easily torn off, the structure is simple, the installation is convenient, and the reliability of the overall structure of the push switch 10 is improved.

[0050] It should be noted that the avoidance space 112 is located on the side where the second conductive surface 134 of the first PCB board 13 is located. In this way, when the piezoelectric ceramic sheet 12 is pressed by the pressing member 14, the first PCB board 13 can deform in the first direction x along with the piezoelectric ceramic sheet 12.

[0051] In the embodiment of the present application, the push switch 10 further includes a second PCB board 15, which is located in the housing 11. Along the first direction x, the second PCB board 15 can be away from the pressing member 14 relative to the first PCB board 13. Along the first direction x, one end of the two electrical connection joints 114 is electrically connected to the piezoelectric ceramic sheet 12 via the pad 132, and the other end of the electrical connection joints 114 is electrically connected to the second PCB board 15. By setting the second PCB board 15, the second PCB board 15 can be used to process the circuit of the voltage signal generated when the piezoelectric ceramic sheet 12 is pressed by the pressing member 14 and then deformed. The specific processing of the circuit will be further described below.

[0052] See also Figures 2 to 4The edge of the first PCB board 13 has at least one limiting block 133, and the housing 11 is correspondingly provided with a limiting groove 113, and the limiting block 133 is embedded in the corresponding limiting groove 113. The setting of the limiting block 133 and the limiting groove 113, on the one hand, can limit the installation position of the first PCB board 13 inside the housing 11, which is conducive to improving the installation alignment speed and accuracy of the first PCB board 13 inside the housing 11, and on the other hand, the first PCB board 13 can be limited to improve the installation stability of the first PCB board 13 in the housing 11, thereby improving the stability of the piezoelectric ceramic sheet 12 connected to the first PCB board 13, so that the piezoelectric ceramic sheet 12 is not easily displaced when the pressing member 14 presses in the first direction x, thereby generating a stable voltage signal.

[0053] It is understandable that the number of the limit blocks 133 can be one, two, three, four, etc., and can be flexibly designed in combination with actual needs, and there is no limitation on this. For example, the first PCB board 13 can include a main body and a plurality of limit blocks 133 arranged at the edge of the main body, and correspondingly, the housing can have a plurality of limit grooves 113. The main body can be circular, rectangular, etc., and the limit blocks 133 can also be circular, rectangular, etc. The shapes of the main body and the limit blocks 133 can be the same or different.

[0054] Furthermore, the first PCB board 13 is provided with a plurality of limit blocks 133, and the plurality of limit blocks 133 are all embedded in the limit groove 113, at least one limit block 133 is fixedly connected to the limit groove 113, and a gap G1 is provided between the side of the other limit blocks 133 that is away from the piezoelectric ceramic sheet 12 along the first direction x and the limit groove 113, and the following conditions are satisfied: 0.1mm≤G1≤0.4mm. At least one limit block 133 is fixedly connected to the limit groove 113, and the other limit blocks 133 are provided with a gap along the side that is away from the piezoelectric ceramic sheet 12 along the first direction x, so that when the piezoelectric ceramic sheet 12 is pressed by the pressing member 14 to generate a stable voltage signal, the voltage signal strength generated when the piezoelectric ceramic sheet 12 is deformed is further improved, so that the pressing switch 10 consumes less power to trigger the electronic pen to work.

[0055] By reasonably limiting the gap G1 between the side of the limiting block 133 on the first PCB board 13 that is away from the piezoelectric ceramic sheet 12 and the limiting groove 113 along the first direction x, the deformation of the piezoelectric ceramic sheet 12 can be reasonably controlled. That is, it can avoid the piezoelectric ceramic sheet 12 being damaged due to excessive deformation when subjected to a large impact force due to an excessively large gap, and it can also avoid the voltage signal strength generated when the piezoelectric ceramic sheet 12 is pressed by the pressing member 14 due to insufficient gap. For example, G1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.

[0056] It can be understood that the number of limit blocks on the first PCB board can be two, three, four, five, etc., in which one or more limit blocks are fixedly connected to the limit slots and there are gaps between other one or more limit blocks and the limit slots. The specific number can be flexibly designed according to actual needs and is not limited to this.

[0057] In the embodiment of the present application, the housing 11 may include a plurality of sub-housings, and the plurality of sub-housings may be detachably connected to each other. In this way, it is convenient to install the piezoelectric ceramic sheet 12, the first PCB board 13, the pressing member 14, the second PCB board 15, the electrical connection connector 114 and other components at corresponding positions in the housing 11, which is conducive to improving the assembly convenience between the components and the housing 11.

[0058] It should be noted that the detachable connection mentioned in the embodiments of the present application may be a screw connection, a snap connection, a threaded connection, etc., which is not limited thereto. The fixed connection mentioned in the embodiments of the present application may be welding, bonding, etc., which is not limited thereto.

[0059] In the embodiment of the present application, along the first direction x, the thickness of the piezoelectric ceramic sheet 12 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; and / or, along the first direction x, the thickness of the first PCB board 13 is greater than or equal to 0.4 mm and less than or equal to 1 mm. By reasonably limiting the thickness of the piezoelectric ceramic sheet 12 and the first PCB board 13 along the first direction x, it is possible to avoid the situation that the piezoelectric ceramic sheet 12 and the first PCB board 13 are too thin, resulting in the inability to use the strength of the first PCB board 13 to increase the strength of the entire piezoelectric ceramic sheet 12 after welding the piezoelectric ceramic sheet 12 to the first PCB board 13, resulting in the inability to increase the service life of the push switch 10; it is also possible to avoid the situation that the first PCB board 13 is too thin when the pressure member 14 acts on the first PCB board 13, resulting in a small deformation amount, and then the voltage signal strength generated by the piezoelectric ceramic sheet 12 is too small to detect whether the pressure member 14 is pressed.

[0060] Optionally, the thickness of the piezoelectric ceramic sheet 12 may be 0.1 mm, 0.2 mm, 0.3 mm, etc., and the thickness of the first PCB board 13 may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0061] It should be noted that the shapes of the piezoelectric ceramic sheet 12 and the first PCB board 13 do not constitute a specific limitation. In the actual application process, they can be designed according to actual needs, and the embodiment of the present application does not make too many limitations. For example, in another embodiment of the present application, refer to Figure 7, the piezoelectric ceramic sheet 12 may be circular, and accordingly, the first PCB board 13 may also be circular, and a rectangular stopper 133 may be convexly provided on the edge of the first PCB board 13. This embodiment differs from the piezoelectric ceramic sheet 12 and the first PCB board 13 in the above embodiment only in shape, and the technical solution and the beneficial effects brought by the technical solution are consistent, which will not be described one by one here.

[0062] In the present application, see Figure 8 The push switch 10 further includes a transistor 16 and a controller (not shown in the figure). The control electrode 161 of the transistor 16 is connected to the first electrode 123 of the piezoelectric ceramic sheet 12, and the second electrode 124 is grounded. The control electrode 161 of the transistor 16 receives the voltage signal SENSOR INT of the first electrode 123. The first electrode 162 of the transistor 16 is grounded, and the second electrode 163 of the transistor 16 is connected to the working voltage VCC. The second electrode 163 outputs an electronic switch signal INT of a high level or a low level. The controller is connected to the second electrode 163 and is configured to perform a press judgment according to the electronic switch signal INT. The control electrode 161 of the transistor 16 is connected to the first electrode 123, so as to control the transistor 16 to be turned on or off according to the voltage of the first electrode 123. That is, when the voltage between the control electrode 161 and the first electrode 162 is greater than 1V, the first electrode 162 and the second electrode 163 of the transistor 16 are turned on, and the second electrode 163 outputs a low-level signal; when the voltage between the control electrode 161 and the first electrode 162 is not greater than 1V, the first electrode 162 and the second electrode 163 of the transistor 16 are turned off and on, and the second electrode 163 outputs a high-level signal. The second electrode 163 is connected to the controller so that the controller detects whether the pressing member 14 is pressed according to the high-level or low-level signal output by the second electrode 163.

[0063] In the embodiment of the present application, the push switch 10 may further include a Zener diode ZL1, the cathode of the Zener diode ZL1 is connected to the control electrode 161, and the anode of the Zener diode ZL1 is grounded. If the voltage generated by the piezoelectric ceramic sheet 12 is too high, that is, when the voltage across the Zener diode ZL1 is too large, the Zener diode ZL1 is reversely broken down, thereby lowering the voltage of the control electrode 161 of the transistor 16. In this way, the transistor 16 can be protected from being damaged by high voltage.

[0064] Further, the transistor 16 may be an N-type field effect transistor QD1A, the field effect transistor QD1A having a gate G, a source S and a drain D, the gate G being the control electrode 161 of the transistor 16, the source S being the first electrode 162 of the transistor 16, the drain D being the second electrode 163 of the transistor 16, and when the voltage between the gate G and the source S is greater than 1V, the drain and the source can be turned on, that is, the field effect transistor QD1A is turned on. In an alternative structure, the transistor 16 may also be a P-type field effect transistor or a triode, etc., and the type of the transistor 16 is not limited here.

[0065] See again Figure 8 The push switch 10 further includes a capacitor CL2, a first resistor RL4, and a second resistor RL3. The first end of the capacitor CL2 is connected to the control electrode 161, the second end of the capacitor CL2 is grounded, the first end of the first resistor RL4 is connected to the control electrode 161, the second end of the first resistor RL4 is grounded, the first end of the second resistor RL3 is connected to the second electrode 163 of the transistor 16, and the second end of the second resistor RL3 is connected to the working voltage VCC. One end of the second resistor RL3 is connected to the second electrode 163 of the transistor 16, and the second resistor RL3 can form a reverse voltage circuit with the transistor 16, and then when the second electrode 163 of the transistor 16 is turned on with the first electrode 162, the second electrode 163 outputs a low-level electronic switch signal INT. In this way, whether the pressing member 14 is pressed can be determined based on whether the electronic switch signal INT is a low-level signal.

[0066] It should be noted that, in the embodiment of the present application, the capacitor CL2 , the first resistor RL4 , and the Zener diode ZL1 can adjust parameters according to the magnitude of SENSOR_INT (the voltage signal of the first electrode 123 ), and the parameter values ​​are not limited.

[0067] In the second aspect, the embodiment of the present application provides a touch electronic pen, which includes a pen tip and the above-mentioned push switch 10, and the push member 14 of the push switch 10 is the pen tip of the touch electronic pen. The specific structure of the push switch 10 refers to the above-mentioned embodiment. Since the touch electronic pen adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0068] Specifically, when the pen tip (i.e., the pressing member 14) of the touch electronic pen is performing a touch operation, the piezoelectric ceramic sheet 12 is deformed by the pressing action of the pen tip, that is, the first electrode 123 of the piezoelectric ceramic sheet 12 generates a voltage signal, so that the conduction and disconnection of the transistor 16 can be controlled according to the magnitude of the voltage signal. When the pen tip is pressed, the voltage generated by the first electrode 123 is greater than 1V, the first electrode 162 and the second electrode 163 of the transistor 16 are turned on, and the second electrode 163 outputs a low-level signal, that is, the electronic switch signal INT is a low-level signal; when the pen tip is not pressed, the voltage generated by the first electrode 123 is not greater than 1V, and the second electrode 163 outputs a high-level signal, that is, the electronic switch signal INT is a high-level signal; the controller determines whether the pen tip is pressed according to whether the electronic switch signal INT is a low-level signal or a high-level signal.

[0069] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to at least two, for example, two, three, four, etc. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0070] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A push switch based on piezoelectric ceramics, characterized in that: include: A shell, wherein the interior of the shell is hollow, and the shell is provided with an opening in a first direction, and the opening is communicated with the interior of the shell; A pressing member, the pressing member is located in the housing and one end of the pressing member protrudes from the opening; A piezoelectric ceramic sheet, the piezoelectric ceramic sheet is located in the housing, the piezoelectric ceramic sheet has a first surface and a second surface opposite to each other along the first direction, the first surface is connected to the other end of the pressing member, and the second surface has a first electrode and a second electrode; A first PCB board, the first PCB board is located in the shell and is fixedly connected to the second surface of the piezoelectric ceramic sheet, the edge portion of the first PCB board is installed on the shell, the middle portion of the first PCB board can be deformed in the first direction, and the shell has an escape space inside for evading when the middle portion is deformed.

2. The push switch according to claim 1, characterized in that: The push switch also includes two electrical connection connectors, which are arranged inside the shell. The first PCB board has a first conductive surface facing the piezoelectric ceramic sheet along the first direction. The first conductive surface has two solder pads that are respectively conductive to the first electrode and the second electrode of the second surface, and the two solder pads are respectively abutted and fitted with the two corresponding electrical connection connectors.

3. The push switch according to claim 2, characterized in that: The push switch also includes: A second PCB board, the second PCB board is located in the shell, along the first direction, one end of the two electrical connection connectors are electrically connected to the piezoelectric ceramic sheet via the welding pad, and the other end of the electrical connection connectors are electrically connected to the second PCB board.

4. The push switch according to claim 1, characterized in that: The edge portion of the first PCB board has at least one limiting block, and the housing is correspondingly provided with a limiting groove, and the limiting block is embedded in the corresponding limiting groove.

5. The push switch according to claim 4, characterized in that: The first PCB board is provided with a plurality of the limit blocks, and the plurality of limit blocks are all embedded in the corresponding limit grooves, at least one of the limit blocks is fixedly connected to the limit groove, and a gap G1 is provided between the side of the remaining limit blocks that is away from the piezoelectric ceramic sheet along the first direction and the limit groove, and satisfies: 0.1mm≤G1≤0.4mm.

6. The push switch according to claim 1, characterized in that: Along the first direction, the thickness of the piezoelectric ceramic sheet is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; And / or, along the first direction, the thickness of the first PCB board is greater than or equal to 0.4 mm and less than or equal to 1 mm.

7. The push switch according to claim 1, characterized in that: The push switch also includes a transistor and a controller, the control electrode of the transistor is connected to the first electrode, the second electrode is grounded, the first electrode of the transistor is grounded, the second electrode of the transistor is connected to the working voltage, the second electrode outputs a high level or a low level signal, and the controller is connected to the second electrode and is configured to make a press judgment based on the level signal.

8. The push switch according to claim 7, characterized in that: The push switch also includes a capacitor, a first resistor and a second resistor, the first end of the capacitor is connected to the control electrode, the second end of the capacitor is grounded, the first end of the first resistor is connected to the control electrode, the second end of the first resistor is grounded, the first end of the second resistor is connected to the second electrode of the transistor, and the second end of the second resistor is connected to the working voltage.

9. The push switch according to claim 7, characterized in that: The push switch further includes a voltage regulator diode, a cathode of the voltage regulator diode is connected to the control electrode, and an anode of the voltage regulator diode is grounded.

10. A touch electronic pen, comprising a pen tip, characterized in that: The push switch comprises the push switch according to any one of claims 1 to 9, wherein the pressing member of the push switch is the pen tip.

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