Capacitive pressure sensor, shell assembly and electronic pen

Abstract

The utility model particularly relates to a capacitive pressure sensor, a shell assembly and an electronic pen, the capacitive pressure sensor comprises a variable capacitor, the variable capacitor comprises a flexible conducting strip, an annular gasket and a dielectric layer which are stacked in sequence, and the first side of the flexible conducting strip is arranged to be in contact with an outer pressure part; the second side, back to the external pressure piece, of the flexible conducting strip is provided with an arc-shaped protrusion. The annular gasket is arranged on the second side of the flexible conducting strip, and a through hole for deformation of the arc-shaped bulge is formed in the middle of the annular gasket; the dielectric layer is arranged on the side, back to the flexible conducting strip, of the annular gasket, and a conducting layer is arranged on the side, back to the annular gasket, of the dielectric layer. The second side, back to the external pressure piece, of the flexible conducting strip is provided with the arc-shaped protrusion, the arc-shaped protrusion penetrates through the annular gasket to make contact with the dielectric layer, the deformation amount of the flexible conducting strip in the using process can be reduced, and the service life of the flexible conducting strip is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and in particular, to a capacitive pressure sensor, a housing assembly, and an electronic pen. Background Art

[0002] The information provided in this section is only background information related to the present disclosure, and it does not necessarily represent prior art.

[0003] Currently, most of the pressure-variable capacitance sensors of existing tactile devices such as electronic pens use a force-receiving rod to press a very thin conductive sheet with flat surfaces on both sides to contact a conductive ceramic sheet, so as to sense the force on the force-receiving rod. However, when the force-receiving rod directly presses the conductive sheet, the middle of the conductive sheet is subjected to greater force and the periphery is subjected to smaller force, resulting in the middle of the conductive sheet being stretched and thinned, with a large deformation. After the force-receiving rod applies force repeatedly, the conductive sheet will be worn and the internal molecular structure will change, causing the deformation of the conductive sheet to increase, and further resulting in a deterioration of the sensing performance of the pressure-variable capacitance sensor in the electronic pen.

[0004] Moreover, when the conductive sheet is deformed as a whole by the force-receiving rod pressing, a certain degree of contact area needs to be formed on the capacitive surface of the conductive sheet contacting the conductive ceramic sheet to change the output capacitance of the conductive sheet. This process requires the force-receiving rod to apply a large pressure, making the pressure-variable capacitance sensor unable to sense light pressure and resulting in poor sensitivity of the pressure-variable capacitance sensor. Summary of the Invention

[0005] The objective of this application is to at least solve the technical problem that the conductive sheet is prone to failure during the long-term compression deformation process. This objective is achieved through the following technical solutions:

[0006] In a first aspect of this application, a capacitive pressure sensor is provided. The capacitive pressure sensor includes a variable capacitor. The variable capacitor includes a flexible conductive sheet, an annular gasket, and a dielectric layer that are stacked in sequence. The first side of the flexible conductive sheet is set to contact an external pressure member, and an arc-shaped protrusion is provided on the second side of the flexible conductive sheet facing away from the external pressure member. The annular gasket is disposed on the second side of the flexible conductive sheet, and a through hole for the arc-shaped protrusion to deform is formed in the middle of the annular gasket. The dielectric layer is disposed on the side of the annular gasket facing away from the flexible conductive sheet, and a conductive layer is provided on the side of the dielectric layer facing away from the annular gasket.

[0007] Those skilled in the art can understand that in this application, an arc-shaped protrusion is provided on the second side of the flexible conductive sheet facing away from the external pressure member. By passing through the annular gasket through the arc-shaped protrusion to contact the dielectric layer, the deformation amount of the flexible conductive sheet during use can be reduced, and the service life of the flexible conductive sheet is improved. Specifically, the arc-shaped protrusion can reduce the deformation amount of the flexible conductive sheet. After the capacitive pressure sensor is repeatedly clicked, the wear and internal molecular structure change of the arc-shaped protrusion of the flexible conductive sheet are relatively small. Therefore, the service life of the flexible conductive sheet can be extended.

[0008] In addition, the flexible conductive sheet moves as a whole during the compression process. When the arc-shaped protrusion of the flexible conductive sheet contacts the dielectric layer, a capacitance change can be generated, so that the capacitive pressure sensor can sense a lighter pressure, improving the sensitivity of the capacitive pressure sensor. Further, by changing the arc surface curvature of the arc-shaped protrusion of the flexible conductive sheet, different pressure sensing change curves can be reflected by the capacitive pressure sensor.

[0009] In some embodiments, the first side of the flexible conductive sheet is set as a plane, and a lapping portion that lapping to the annular gasket is provided on the periphery of the flexible conductive sheet.

[0010] In some embodiments, the arc-shaped protrusion is set to at least cover the through hole, and the arc-shaped protrusion can deform in the direction of the dielectric layer through the through hole under the push of the external pressure member.

[0011] The second aspect of this application provides a housing assembly of a capacitive pressure sensor. The housing assembly is used to accommodate the capacitive pressure sensor according to the first aspect of this application. The housing assembly includes: a housing, an accommodation space for accommodating the capacitive pressure sensor is formed inside the housing; two signal lines, the two signal lines are respectively connected to the flexible conductive sheet and the conductive layer of the capacitive pressure sensor, and at least one signal line is set to be integrally formed with the housing.

[0012] In some embodiments, the housing is set as a cylindrical structure with one side open. One signal line is arranged on the side wall of the cylindrical structure and connected to the flexible conductive sheet, and the other signal line is arranged at the bottom of the cylindrical structure and faces the conductive layer.

[0013] In some embodiments, the housing assembly further includes an inner housing, and the inner housing extends from the open side into the accommodation space of the outer housing and is installed on the outer housing.

[0014] In some embodiments, a clamping groove is provided on the inner wall of the outer housing, a clamping block that can cooperate with the clamping groove is provided on the outer wall of the inner housing, and a guiding portion that cooperates with the clamping groove is provided at the assembly front end of the clamping block.

[0015] In some embodiments, the inner shell is mounted to the outer shell and pressed against the flexible conductive sheet of the capacitive pressure sensor. A gap for accommodating the flexible conductive sheet is formed between the inner shell and the outer shell, and the thickness of the gap is less than the thickness of the flexible conductive sheet in its natural state.

[0016] The third aspect of the present application provides an electronic pen, which includes a capacitive pressure sensor according to the first aspect of the present application, and / or a housing assembly including a capacitive pressure sensor according to the second aspect of the present application.

[0017] In some embodiments, the external pressure member is the pen tip assembly of the electronic pen. The pen tip assembly includes a pen tip and a pen tip clip sleeved on one end of the pen tip close to the flexible conductive sheet. The pen tip clip is provided with a planar contact head that contacts the flexible conductive sheet. Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 It is a schematic exploded view of an electronic pen according to an embodiment of the present application;

[0020] Figure 2 is Figure 1 a partial cross-sectional view of the shown electronic pen;

[0021] Figure 3 is Figure 1 a whole cross-sectional view of the shown electronic pen;

[0022] Figure 4 is Figure 3 an assembly drawing of the shown electronic pen;

[0023] Figure 5 is Figure 3 another perspective assembly drawing of the shown electronic pen;

[0024] Figure 6 It is an assembly drawing of an electronic pen according to another embodiment of the present application;

[0025] Figure 7 is Figure 6 a partial structure assembly drawing of the shown electronic pen;

[0026] Figure 8 It is a schematic structural view of an electronic pen according to an embodiment of the present application in an initial state;

[0027] Figure 9 It is a schematic structural view of an electronic pen according to an embodiment of the present application in a lightly pressed state;

[0028] Figure 10 This is a schematic structural diagram of an electronic pen in a heavy - pressure state according to an embodiment of the present application.

[0029] Among them, the reference numerals are as follows:

[0030] 100, electronic pen;

[0031] 10, flexible conductive sheet; 11, arc - shaped protrusion; 12, overlapping part; 13, tab;

[0032] 20, annular gasket; 21, through - hole;

[0033] 30, dielectric layer; 31, conductive layer;

[0034] 40, one signal line (positive - pole signal line);

[0035] 50, another signal line (negative - pole signal line);

[0036] 60, external pressure member (refill assembly); 61, refill; 62, refill clip;

[0037] 70, housing assembly; 71, outer shell; 711, card slot; 72, inner shell; 721, card block; 722, outer edge;

[0038] 80, electronic control board. Detailed implementation manners

[0039] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that the capacitive pressure sensor of the present application described through the electronic pen is only a preferred embodiment, and it does not limit the application scope of the capacitive pressure sensor. For example, the capacitive pressure sensor of the present application can also be used in electronic devices such as touch display screens, and such adjustments do not deviate from the protection scope of the capacitive pressure sensor of the present application.

[0040] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly indicated in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "include", "comprise", and "have" are inclusive and thus specify the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0041] Although the terms first, second, etc. may be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. In addition, in the description of this application, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] For ease of description, spatial relative terms can be used in the text to describe the relationship of an element or feature relative to another element or feature as shown in the figure, and these relative terms are, for example, "end", "length", "inside", "outside", etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation except the orientation depicted in the figure. For example, if the mechanism in the figure flips, the element described as "below other elements or features" or "below other elements or features" will be subsequently oriented to "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include the orientation on and below. The mechanism can be oriented in addition (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0043] A related part of the tactile electronic device uses a capacitive pressure sensor to sense changes in tactile pressure. The capacitive pressure sensor includes a fixed electrode and a movable electrode arranged at intervals. The movable electrode is connected to the force-bearing end of the tactile electronic device and can move relative to the fixed electrode according to the pressure change at the force-bearing end, thereby changing the capacitance value of the capacitive pressure sensor. The tactile electronic device senses the contact pressure of the force-bearing end according to the change in the capacitance value of the capacitive pressure sensor.

[0044] Among them, the active electrode of the capacitive pressure sensor is generally set as a flat plate structure, which can move relative to the fixed electrode by deforming when subjected to pressure from the force-bearing end. At this time, the active electrode needs to undergo a large deformation to change the capacitance value of the capacitive pressure sensor. In the long run, it will cause fatigue damage to the capacitive pressure sensor. In addition, the active electrode will also have uncertain deformation direction or even displacement during the process of large deformation, resulting in inductive distortion of the capacitive pressure sensor.

[0045] In this application, for the phenomenon that the movable electrodes of some related capacitive pressure sensors are prone to inductive distortion, it is proposed that an arc-shaped protrusion capable of passing through an annular gasket is provided on one side of the movable electrode. The arc-shaped protrusion can not only reduce the deformation amount of the movable electrode, but also reduce the phenomenon of direction deviation of the movable electrode during the deformation process through the restraint of the annular gasket.

[0046] As Figures 1 to 3 shown, the capacitive pressure sensor provided by the embodiment of this application includes a variable capacitor, and the variable capacitor includes a flexible conductive sheet 10, an annular gasket 20, and a dielectric layer 30 stacked in sequence. The first side of the flexible conductive sheet 10 is set to contact an external pressure member 60, and an arc-shaped protrusion 11 is provided on the second side of the flexible conductive sheet 10 facing away from the external pressure member 60; the annular gasket 20 is disposed on the second side of the flexible conductive sheet 10, and a through hole 21 for the arc-shaped protrusion 11 to deform is formed in the middle of the annular gasket 20; the dielectric layer 30 is disposed on the side of the annular gasket 20 facing away from the flexible conductive sheet 10, and a conductive layer 31 is provided on the side of the dielectric layer 30 facing away from the annular gasket 20.

[0047] In this embodiment, the embodiment of this application proposes that an arc-shaped protrusion 11 is provided on the second side of the flexible conductive sheet 10 facing away from the external pressure member 60. By passing through the annular gasket 20 and contacting the dielectric layer 30 through the arc-shaped protrusion 11, the deformation amount of the flexible conductive sheet 10 during use can be reduced, and the service life of the flexible conductive sheet 10 is improved. Specifically, as Figures 8 to 10 shown, the arc-shaped protrusion 11 can reduce the deformation amount of the flexible conductive sheet 10. After the capacitive pressure sensor is repeatedly clicked, the wear and internal molecular structure change of the arc-shaped protrusion 11 of the flexible conductive sheet 10 are small. Therefore, the service life of the flexible conductive sheet 10 can be extended.

[0048] In addition, the flexible conductive sheet 10 translates as a whole during the pressure-receiving process. When the arc-shaped protrusion 11 of the flexible conductive sheet 10 contacts the dielectric layer 30, a capacitance change can be generated, so that the capacitive pressure sensor can sense a lighter pressure feeling and improve the sensitivity of the capacitive pressure sensor. Further, different pressure feeling change curves can be reflected by changing the arc surface curvature of the arc-shaped protrusion 11 of the flexible conductive sheet 10.

[0049] Specifically, the dielectric layer 30 is composed of a ceramic body and a conductive layer 31. The conductive layer 31 is sintered on the side of the ceramic body facing away from the flexible conductive sheet 10 to form an electrode of the capacitive pressure sensor, and the flexible conductive sheet 10 forms the other electrode of the capacitive pressure sensor.

[0050] It should be noted that the embodiments of the present application do not limit the specific shape and material of the flexible conductive sheet 10 because the invention point of the present application is that an arc-shaped protrusion 11 capable of passing through the annular gasket 20 is provided on the second side of the flexible conductive sheet 10, so as to reduce fatigue damage of the flexible conductive sheet 10 and the phenomenon of deformation direction deviation. As for the specific shape and material of the flexible conductive sheet 10, it includes a variety of embodiments. For example, the flexible conductive sheet 10 can be set as a square copper sheet or a circular aluminum sheet. These embodiments all belong to the protection scope of the flexible conductive sheet 10 of the present application. As for other embodiments of the flexible conductive sheet 10, they will not be elaborated one by one here.

[0051] In addition, the embodiments of the present application do not limit the application scenarios of the capacitive pressure sensor because the invention of the present application lies in the structural improvement of the capacitive pressure sensor. The application scenarios of the capacitive pressure sensor include a variety of embodiments. For example, the capacitive pressure sensor can be applied to touch-pressure sensing devices such as an electronic pen 100 and a touch screen. These embodiments all belong to the protection scope of the capacitive pressure sensor of the present application. As for other application scenarios of the capacitive pressure sensor, they will not be elaborated one by one here.

[0052] The specific structure and distribution of the capacitive pressure sensor according to the embodiment of the present application are described in detail below.

[0053] like Figures 1 to 3 As shown, in some embodiments, the first side of the flexible conductive sheet 10 is set to be a plane, and the periphery of the flexible conductive sheet 10 is provided with a lap portion 12 lapped to the annular gasket 20 .

[0054] In this embodiment, by setting the overlapping portion 12 of the flexible conductive sheet 10 on the annular gasket 20, and then determining the contact area between the flexible conductive sheet 10 and the dielectric layer 30 and the capacitance value of the capacitive pressure sensor through the arc-shaped protrusion 11 of the flexible conductive sheet 10, the deformation size of the arc-shaped protrusion 11 of the flexible conductive sheet 10 can characterize the size of the external pressure, thereby achieving accurate transmission of the external pressure to the arc-shaped protrusion 11, the contact area between the arc-shaped protrusion 11 and the dielectric layer 30, and the capacitance value of the capacitive pressure sensor, reducing the movement or shaking of the flexible conductive sheet 10 under the action of the external pressure, affecting the accurate characterization between the capacitance value of the capacitive pressure sensor and the external pressure.

[0055] like Figures 1 to 3 As shown, in some embodiments, the arc-shaped protrusion 11 is configured to at least cover the through hole 21 , and the arc-shaped protrusion 11 can be deformed toward the dielectric layer 30 through the through hole 21 under the pressure of the external pressure member 60 .

[0056] In this embodiment, since the capacitance value of the capacitive pressure sensor is determined by the contact area between the arc-shaped protrusion 11 and the dielectric layer 30, and the contact area between the arc-shaped protrusion 11 and the dielectric layer 30 is related to the size of the through hole 21 and the magnitude of the external pressure. On the premise that the size of the through hole 21 is determined, in order to enable the capacitance value of the capacitive pressure sensor to accurately represent the external pressure and reduce the unstable interference factors generated by the radial gap between the arc-shaped protrusion 11 and the through hole 21 on the capacitance value of the capacitive pressure sensor, the embodiment of the present application proposes to set the arc-shaped protrusion 11 to at least cover the through hole 21. Thus, during the change of the external pressure, the arc-shaped protrusion 11 always covers the through hole 21. At this time, the change of the capacitance value of the capacitive pressure sensor is determined by the change of the external pressure, improving the accuracy of the capacitance value change of the capacitive pressure sensor in representing the external pressure change.

[0057] Furthermore, the embodiment of the present application also proposes that the projection of the conductive layer 31 on the annular gasket 20 is set to at least cover the through hole 21, so that the conductive layer 31 can cooperate with the flexible conductive sheet 10, thereby reducing the unstable interference factors generated by the through hole 21 on the capacitance value of the capacitive pressure sensor.

[0058] As Figures 4 to 7 shown, the second aspect of the present application provides a housing assembly 70 of a capacitive pressure sensor. The housing assembly 70 is used to accommodate the capacitive pressure sensor according to the first aspect of the present application. The housing assembly 70 includes a housing 71 and two signal lines. An accommodation space for accommodating the capacitive pressure sensor is formed inside the housing 71; the two signal lines are respectively connected to the flexible conductive sheet 10 and the conductive layer 31 of the capacitive pressure sensor, and at least one signal line 40 is set to be integrally formed with the housing 71.

[0059] In this embodiment, those skilled in the art can understand that by setting the signal line to be integrally formed with the housing 71, the number of components of the capacitive pressure sensor can be reduced, the production and assembly steps of the capacitive pressure sensor can be reduced, and the assembly working hours of the capacitive pressure sensor can be saved.

[0060] Moreover, by setting the signal line to be integrally formed with the housing 71, the probability of assembly errors between the signal line and the housing 71 can be reduced, the positioning accuracy of the signal line can be improved, the stability of the signal line can be improved, and the problem that the performance of the capacitive pressure sensor is unstable due to uneven positioning of the signal line during the manual assembly of the signal line is solved.

[0061] As Figures 4 to 7 shown, in some embodiments, the housing 71 is set as a cylindrical structure with one side open. One signal line 40 is disposed on the side wall of the cylindrical structure and connected to the flexible conductive sheet 10, and the other signal line 50 is disposed at the bottom of the cylindrical structure and faces the conductive layer 31.

[0062] In this embodiment, by connecting a signal line 40 to the flexible conductive sheet 10 along the side wall of the cylindrical structure, the interference of a signal line 40 on the normal operation of the flexible conductive sheet 10 can be reduced. Specifically, a signal line 40 is connected to the edge of the flexible conductive sheet 10, such as connected to the overlapping portion 12 around the flexible conductive sheet 10, so that a signal line 40 neither interferes with the arc-shaped protrusion 11 in the middle of the flexible conductive sheet 10 spatially nor affects the normal deformation of the arc-shaped protrusion 11 in terms of force, improving the sensing accuracy of the flexible conductive sheet 10.

[0063] Specifically, ear tabs 13 are provided at the edge of the flexible conductive sheet 10, and a sunk groove or a through hole corresponding to the ear tabs 13 is provided on the side wall of the outer shell 71. A signal line 40 is embedded in the sunk groove or the through hole of the outer shell 71, thereby reducing the space occupied by a signal line 40 and reducing the influence of a signal line 40 on the flexible conductive sheet 10.

[0064] Further, a signal line 40 is set as the positive electrode signal line 40 of the capacitive pressure sensor, which is used to sense the force and displacement of the flexible conductive sheet 10, and then characterized as the change of the capacitance value of the capacitive pressure sensor.

[0065] Another signal line 50 is set as the negative electrode signal line 50 connected to the conductive layer 31. The negative electrode signal line is provided with a patch connected to the conductive layer 31, and the projection of the patch on the annular gasket 20 is set to cover at least the through hole 21. By setting the projection of the patch of the negative electrode signal line on the annular gasket 20 to cover at least the through hole 21, the patch of the negative electrode signal line can cooperate with the flexible conductive sheet 10, so that the capacitance value of the capacitive pressure sensor is determined by the corresponding area between the flexible conductive sheet 10 and the patch of the negative electrode signal line. On the premise that the size of the through hole 21 is determined, the unstable interference factor of the radial gap between the patch of the negative electrode signal line and the through hole 21 on the capacitance value of the capacitive pressure sensor is reduced, and the characterization accuracy of the change of the capacitance value of the capacitive pressure sensor with respect to the change of the external pressure is improved.

[0066] As Figures 4 to 7 shown, in some embodiments, the housing assembly 70 further includes an inner shell 72, and the inner shell 72 extends from one side opening into the accommodation space of the outer shell 71 and is installed on the outer shell 71.

[0067] In this embodiment, the inner shell 72 is used to install the external pressure member 60, such as the refill assembly 60 of the electronic pen 100. When the external pressure member 60 such as the refill assembly 60 receives the writing pressure, the refill assembly 60 can squeeze and contact the flexible conductive sheet 10 under the pressure of the pen tip. The flexible conductive sheet 10 will deform with the pressure of the refill assembly 60, and the arc-shaped protrusion 11 of the conductive sheet of the refill assembly 60 will pass through the through hole 21 of the annular gasket 20 and thus contact the dielectric layer 30. As the writing pressure of the refill assembly 60 changes, the contact area between the flexible conductive sheet 10 and the dielectric layer 30 will also change accordingly, which will cause the capacitance value of the dielectric layer 30 connected to the electronic control board 80 of the electronic pen 100 to change. The change in the capacitance value of the capacitive pressure sensor can accurately represent the writing pressure of the refill assembly 60.

[0068] In addition, the outer edge 722 of the inner shell 72 is stuck outside the barrel opening of the outer shell 71 to limit the inner shell 72 from excessively compressing the flexible conductive sheet 10 inside the outer shell 71, so that the flexible conductive sheet 10 can maintain a normal working state.

[0069] As Figures 4 to 7 shown, in some embodiments, a card slot 711 is provided on the inner wall of the outer shell 71, and a block 721 that can cooperate with the card slot 711 is provided on the outer wall of the inner shell 72. A guiding portion that cooperates with the card slot 711 is provided at the assembly front end of the block 721.

[0070] In some embodiments, the inner shell 72 is installed on the outer shell 71 and pressed against the flexible conductive sheet 10 of the capacitive pressure sensor. A gap for accommodating the flexible conductive sheet 10 is formed between the inner shell 72 and the outer shell 71, and the thickness of the gap is smaller than the thickness of the flexible conductive sheet 10 in the natural state. That is to say, in the natural assembly state of the inner shell 72 and the outer shell 71, the inner shell 72 is snap-fitted and positioned at a fixed position of the outer shell 71, and can exert a slight pressure on the flexible conductive sheet 10, so as to play a role in limiting and fixing the flexible conductive sheet 10 and reducing the influence of the shaking of the flexible conductive sheet 10 inside the housing assembly 70 on the detection accuracy of the flexible conductive sheet 10.

[0071] The third aspect of the present application provides an electronic pen 100, which includes the capacitive pressure sensor according to the first aspect of the present application, and / or a housing assembly 70 including the capacitive pressure sensor according to the second aspect of the present application.

[0072] In this embodiment, the electronic pen 100 has all the technical effects of the capacitive pressure sensor according to the first aspect of the present application and the housing assembly 70 according to the second aspect of the present application, and will not be elaborated here.

[0073] In some embodiments, the external pressure member 60 is the refill assembly 60 of the electronic pen 100. The refill assembly 60 includes a refill 61 and a refill clip 62 sleeved on one end of the refill 61 close to the flexible conductive sheet 10. The refill clip 62 is provided with a planar contact head that contacts the flexible conductive sheet 10.

[0074] In this embodiment, the top surface of the sensor refill clip 62 in the present invention uses a planar contact head, and then the planar contact head of the refill clip 62 is used to squeeze a flexible conductive sheet 10 with an arc-shaped protrusion 11 on one side. The arc-shaped protrusion 11 of the flexible conductive sheet 10 contacts the ceramic body of the conductive layer 31. When the pressure of the refill assembly 60 increases, the contact area between the arc-shaped protrusion 11 of the flexible conductive sheet 10 and the ceramic body of the conductive layer 31 gradually increases, so as to sense the pressure change of the refill assembly 60.

[0075] Specifically, the specific working steps of the electronic pen 100 include;

[0076] During the process of the user writing with the electronic pen 100, the planar contact head of the refill clip 62 will squeeze and contact the flexible conductive sheet 10 under the writing pressure. The flexible conductive sheet 10 will deform with the writing pressure of the refill clip 62. Some arc-shaped protrusions 11 of the flexible conductive sheet 10 will pass through the through hole 21 of the annular gasket 20 and then contact the ceramic body of the conductive layer 31. As the writing pressure increases, the contact area between the arc-shaped protrusion 11 of the flexible conductive sheet 10 and the ceramic body of the conductive layer 31 will increase, which will cause the capacitance value output by the capacitive pressure sensor to also increase. The change in the capacitance value output by the capacitive pressure sensor is used to characterize the change in the writing pressure.

[0077] The refill clip 62 of the capacitive pressure sensor in the embodiment of the present application uses a planar contact head, and then the planar contact head of the refill clip 62 is used to squeeze a flexible conductive sheet 10 with an arc-shaped protrusion 11 on one side, and the arc-shaped protrusion 11 is used to contact the ceramic body of the conductive layer 31. Therefore, under the condition of the same writing pressure, the deformation amount of the arc-shaped protrusion 11 of the flexible conductive sheet 10 is smaller. After the refill clip 62 repeatedly clicks and squeezes the flexible conductive sheet 10, the wear and the change of the internal molecular structure of the arc-shaped protrusion 11 of the flexible conductive sheet 10 are also smaller, so as to extend the service life of the flexible conductive sheet 10, and further extend the service life of the electronic pen 100.

[0078] In addition, under the same writing pressure, the contact area between the arc-shaped protrusion 11 of the flexible conductive sheet 10 and the ceramic body of the conductive layer 31 can be adjusted by changing parameters such as the thickness of the annular gasket 20, the diameter of the through hole 21, and the shape, surface texture, and soft hardness of the arc-shaped protrusion 11 of the flexible conductive sheet 10, so as to meet the requirements of customizing capacitive pressure sensors with different capacitance value specifications.

[0079] As described above, it is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims described above.

Claims

1. A capacitive pressure sensor, characterized in that, The capacitive pressure sensor includes a variable capacitor, and the variable capacitor includes a flexible conductive sheet (10), an annular gasket (20), and a dielectric layer (30) stacked in sequence. The first side of the flexible conductive sheet (10) is arranged to contact an external pressure member (60), and an arc-shaped protrusion (11) is provided on the second side of the flexible conductive sheet (10) facing away from the external pressure member (60). The annular gasket (20) is arranged on the second side of the flexible conductive sheet (10), and a through hole (21) for the arc-shaped protrusion (11) to deform is formed in the middle of the annular gasket (20). The dielectric layer (30) is arranged on the side of the annular gasket (20) facing away from the flexible conductive sheet (10), and a conductive layer (31) is provided on the side of the dielectric layer (30) facing away from the annular gasket (20).

2. The capacitive pressure sensor according to claim 1, wherein, The first side of the flexible conductive sheet (10) is arranged as a plane, and a lapping portion (12) that extends to the annular gasket (20) is provided on the periphery of the flexible conductive sheet (10).

3. The capacitive pressure sensor according to claim 1, characterized in that The arc-shaped protrusion (11) is arranged to at least cover the through hole (21), and the arc-shaped protrusion (11) can deform in the direction of the dielectric layer (30) through the through hole (21) under the pushing of the external pressure member (60).

4. A housing assembly of a capacitive pressure sensor, characterized in that, The housing assembly (70) is used to accommodate the capacitive pressure sensor according to any one of claims 1 to 3, and the housing assembly (70) includes: A housing (71), and an accommodation space for accommodating the capacitive pressure sensor is formed inside the housing (71). Two signal lines, the two signal lines are respectively connected to the flexible conductive sheet (10) and the conductive layer (31) of the capacitive pressure sensor, and at least one of the signal lines is arranged to be integrally formed with the housing (71).

5. The housing assembly of the capacitive pressure sensor according to claim 4, characterized in that, The housing (71) is arranged as a cylindrical structure with one side open, one signal line (40) is arranged on the side wall of the cylindrical structure and connected to the flexible conductive sheet (10), and the other signal line (50) is arranged at the bottom of the cylindrical structure and faces the conductive layer (31).

6. The housing assembly of the capacitive pressure sensor according to claim 5, characterized in that, The housing assembly (70) further includes an inner housing (72), and the inner housing (72) extends from the open side into the accommodation space of the housing (71) and is installed on the housing (71).

7. The housing assembly of the capacitive pressure sensor according to claim 6, characterized in that, A clamping groove (711) is provided on the inner wall of the housing (71), a clamping block (721) capable of cooperating with the clamping groove (711) is provided on the outer wall of the inner housing (72), and a guiding portion for cooperating with the clamping groove (711) is provided at the assembly front end of the clamping block (721).

8. The housing assembly of the capacitive pressure sensor according to claim 6, characterized in that, The inner housing (72) is installed on the housing (71) and presses against the flexible conductive sheet (10) of the capacitive pressure sensor, and a gap for accommodating the flexible conductive sheet (10) is formed between the inner housing (72) and the housing (71), and the thickness of the gap is less than the thickness of the flexible conductive sheet (10) in a natural state.

9. An electronic pen, characterized in that, The electronic pen (100) includes the capacitive pressure sensor according to any one of claims 1 to 3, and / or a housing assembly (70) including the capacitive pressure sensor according to any one of claims 4 to 8.

10. The electronic pen according to claim 9, wherein, The external pressure member (60) is a refill assembly of the electronic pen (100). The refill assembly includes a refill (61) and a refill clip (62) sleeved on one end of the refill (61) close to the flexible conductive sheet (10). The refill clip (62) is provided with a planar contact head that contacts the flexible conductive sheet (10).

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