Pressure sensor and stylus

Abstract

The present disclosure provides a pressure sensor and a stylus pen. The pressure sensor comprises: a flexible substrate comprising a first part, a second part and a connecting part connected in sequence, and the first part is opposite to the second part; the flexible substrate comprises a first wire, the first wire extends from the first part to the connecting part, the first wire comprises an arc-shaped part located at the second part, and the arc-shaped part is arranged along the edge of the second part; a dielectric layer is arranged between the first part and the second part; a first electrode is arranged on the first part and electrically connected with the first wire; and a second electrode is arranged on the second part and electrically connected with the second part; wherein the contact area of the first electrode with the first part changes according to the external pressure received by the first part, and the capacitance value of the capacitor changes based on the contact area. The present disclosure integrates the first electrode, the first wire and the second wire on the folded flexible substrate, realizes the pressure sensor function with a relatively simple structure, and reduces the volume and cost of the pressure sensor.

Description

Technical Field

[0001] This disclosure relates to the field of electronic device technology, specifically to a pressure sensor and a stylus. Background Technology

[0002] With the development and application of stylus technology, consumers have placed higher demands on the writing sensitivity of styluses. By incorporating a pressure sensor within the stylus, pressure signals can be converted into electrical signals, enabling the stylus to recognize the user's writing movements with minute pressure and to make the handwriting change according to the user's pressure.

[0003] However, in related technologies, the pressure sensor in the stylus is relatively expensive and bulky, which makes the installation space inside the stylus quite tight and increases the component cost of the stylus. Utility Model Content

[0004] To address the aforementioned problems in the related technologies, this disclosure provides a pressure sensor and a stylus.

[0005] The first aspect of this disclosure provides a pressure sensor, the pressure sensor comprising: a flexible substrate, including a first part, a second part and a connecting part connected in sequence, wherein the first part and the second part are opposite to each other;

[0006] The flexible substrate includes a first conductor extending from the first portion to the connecting portion, and the first conductor includes an arcuate portion located in the second portion, the arcuate portion being disposed along the edge of the second portion;

[0007] A dielectric layer is disposed between the first part and the second part, including a first surface and a second surface facing each other, the first surface facing the first part and the second surface facing the second part;

[0008] A first electrode is disposed on the first part and electrically connected to the first wire, and a gap exists between the first electrode and the first surface; and

[0009] The second electrode is disposed on the second surface and electrically connected to the second part.

[0010] The first electrode, the dielectric layer, and the second electrode constitute a capacitor. The contact area between the first electrode and the first surface varies according to the external pressure applied to the first part, and the capacitance value of the capacitor varies based on the contact area.

[0011] In some embodiments, the flexible substrate further includes: a second wire, a first end of which is a connection end, the connection end being disposed in the second portion and electrically connected to the second electrode, and a second end of which extends to the connection portion;

[0012] The width of the connecting end of the second conductor is greater than the width of the second end, and the axis of symmetry of the connecting end of the second conductor coincides with the axis of symmetry of the second part.

[0013] In some embodiments, the pressure sensor further includes a conductive element, one side of which is electrically connected to the connection terminal, and the other side of which is electrically connected to the connection terminal.

[0014] The sum of the thickness of the conductive element and the thickness of the connecting end is greater than the thickness of the arc-shaped portion.

[0015] In some embodiments, the second electrode includes a first connection surface connected to the dielectric layer;

[0016] The connection end includes a second connection surface connected to the conductive element;

[0017] The area of ​​the first connecting surface is greater than the area of ​​the second connecting surface.

[0018] In some embodiments, the pressure sensor further includes an insulating layer disposed on the surface of the arcuate portion facing the dielectric layer, and the other side of the conductive element is also connected to the insulating layer.

[0019] In some embodiments, the pressure sensor further includes a support member disposed along the edge of the first surface, wherein one side of the support member is connected to the first surface and the other side of the support member is connected to the first electrode, such that the first surface and the first electrode are spaced apart.

[0020] In some embodiments, the pressure sensor includes: a housing, wherein the flexible substrate and the dielectric layer are disposed within the housing;

[0021] The housing includes a first opening and a second opening, wherein the first opening is used to allow the connecting portion to extend out of the housing;

[0022] The second opening is used to expose the first part.

[0023] A second aspect of this disclosure provides a stylus, the stylus comprising: a pen body;

[0024] The pressure sensor as described in any of the first aspects is disposed within the pen body.

[0025] In some embodiments, the stylus includes: a pen tip;

[0026] An elastic element is disposed in the pen body. One end of the elastic element is connected to the pen tip, and the other end of the elastic element abuts against the first part. The elastic element squeezes the first part according to the pressure on the pen tip, so that the first part deforms.

[0027] In some embodiments, the surface of the elastic member that abuts against the first part is an arc-shaped surface.

[0028] The technical solutions provided by the disclosed embodiments may include the following beneficial effects: This disclosure integrates a first electrode, a first wire connected to the first electrode, and a second wire connected to the second electrode on a folded flexible substrate, so that the first electrode and the second electrode are opposite to each other and form a capacitor. By setting the arc-shaped portion of the first wire along the edge of the second portion, the wiring space of the flexible substrate can be fully utilized, providing a larger wiring space for the second wire. This achieves the integration of the wiring of the first wire connected to the first electrode and the second wire connected to the second electrode, reduces the number of components in the pressure sensor, realizes the pressure sensing function with a simpler structure, and reduces the size and cost of the pressure sensor. Attached Figure Description

[0029] The above and other objects, features, and advantages of embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0030] Figure 1 This is a schematic diagram of the structure of a pressure sensor provided in an embodiment of this disclosure.

[0031] Figure 2 This is a cross-sectional view of a pressure sensor provided in an embodiment of this disclosure.

[0032] Figure 3 This is a schematic diagram of the second side of the dielectric layer of a pressure sensor provided in an embodiment of this disclosure.

[0033] Figure 4 This is a schematic diagram of the structure of a flexible substrate, a first wire, and a second wire of a pressure sensor provided in an embodiment of this disclosure.

[0034] Figure 5 This is a structural concept of a flexible substrate in a flattened state provided in an embodiment of this disclosure.

[0035] Figure 6 This is a schematic diagram of the structure of a flexible substrate in a flat state that is connected to a conductive element, as provided in an embodiment of this disclosure.

[0036] Figure 7This is another embodiment of the present disclosure showing a flexible substrate and conductive element in a flat state connected to a conductive element.

[0037] Figure 8 yes Figure 2 A schematic diagram of the structure of region A in the middle.

[0038] Figure 9 This is a schematic diagram of the first surface of the dielectric layer of a pressure sensor provided in an embodiment of this disclosure.

[0039] Figure 10 This is a schematic diagram of the structure of a stylus provided in an embodiment of this disclosure.

[0040] Figure 11 This is a schematic diagram of the cross-sectional structure of the tip of a stylus provided in an embodiment of this disclosure.

[0041] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0042] The accompanying figure is labeled as follows:

[0043] 10. Flexible substrate; 11. First part; 12. Second part; 13. Connecting part;

[0044] 20. First electrode; 21. First wire; 22. Arc-shaped portion;

[0045] 30. Second electrode; 31. Second wire; 32. Connecting end;

[0046] 40. Conductive component; 41. Insulating layer;

[0047] 50. Dielectric layer; 51. First surface; 52. Second surface;

[0048] 60. Shell; 61. First shell; 62. Second shell; 63. First opening; 64. Second opening;

[0049] 70. Support component; 80. Pen body; 81. Pen tip; 90. Elastic component; 100. Pressure sensor. Detailed Implementation

[0050] The principles and spirit of this disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement this disclosure, and are not intended to limit the scope of this disclosure in any way.

[0051] It should be noted that although the terms "first," "second," etc., are used herein to describe different modules, steps, and data in the embodiments of this disclosure, these terms are only for distinguishing between different modules, steps, and data, and do not indicate a specific order or degree of importance. In fact, the terms "first," "second," etc., can be used interchangeably.

[0052] The pressure sensor provided in this embodiment can be applied to a stylus, wherein the stylus can be any type of stylus, such as a capacitive stylus, an active electromagnetic stylus, or a passive electromagnetic stylus.

[0053] For example, a stylus can be an electromagnetic pen, which is a simple and quick touch accessory. Electromagnetic pens can be used in conjunction with electromagnetic writing tablets. Electromagnetic styluses achieve precise input through the principle of electromagnetic induction. The coil inside the pen interacts with the electromagnetic induction layer beneath the screen, creating an interactive magnetic field. By detecting changes in this magnetic field, the pen can pinpoint the location of the handwriting trajectory.

[0054] In related technologies, some styluses use integrated chip-based variable resistance or variable capacitance sensors for pressure sensors, manufactured using circuit board soldering and surface mount technology, which is relatively expensive. Other styluses use pressure sensors assembled from components such as a base, machined copper pillars, springs, and deformable elastic conductors. These components have a larger number of parts, more complicated assembly steps, and a larger overall size, requiring more installation space.

[0055] To address the aforementioned technical problems, an embodiment of this disclosure provides a pressure sensor and a stylus.

[0056] Figure 1 This is a schematic diagram of the structure of a pressure sensor provided in an embodiment of this disclosure. Figure 2 This is a cross-sectional view of a pressure sensor provided in an embodiment of this disclosure. Figure 3 This is a schematic diagram of the second side of the dielectric layer of a pressure sensor provided in an embodiment of this disclosure.

[0057] In some embodiments, such as Figure 1 , Figure 2 and Figure 3As shown, the pressure sensor may include: a flexible substrate 10, a dielectric layer 50, a first electrode 20, and a second electrode 30. The first electrode 20 and the second electrode 30 may be conductive components. The flexible substrate 10 may be a support structure for the internal wiring of the pressure sensor, used to house the electrodes and wires. For example, the flexible substrate 10 may be a flexible circuit board, but this disclosure is not limited thereto; the flexible substrate 10 may also be other flexible films or flexible plates that can be provided with conductor wiring. The flexible substrate 10 may include a first part 11, a second part 12, and a connecting part 13 connected in sequence. By folding the flexible substrate 10, the first part 11 and the second part 12 may be arranged opposite each other. The first part 11 and the second part 12 may be used to house conductor wiring, and the connecting part 13 may serve as a connection structure for electrically connecting the pressure sensor to other external devices. The dielectric layer 50 may be disposed between the first part 11 and the second part 12, and the dielectric layer 50 may include a first surface 51 and a second surface 52 facing each other, the first surface 51 facing the first part 11 and the second surface 52 facing the second part 12. The dielectric layer 50 can be part of the capacitor structure. The dielectric layer 50 can serve a dual function of insulation and energy storage in an electric field. It establishes a reverse electric field between the plates through polarization to prevent direct charge flow. Adding the dielectric layer 50 can increase the energy storage density of the capacitor. For example, the dielectric layer 50 can be a ceramic body, but this disclosure is not limited to this; the dielectric layer 50 can also be composed of other materials capable of forming a capacitor. The first electrode 20 can be disposed on the first part 11 of the flexible substrate 10 and has a gap between it and the first surface 51. The second electrode 30 can be disposed on the second surface 52 and electrically connected to the second part 12. By disposing the second electrode 30 on the second surface 52 of the dielectric layer 50, the surface of the second surface 52 of the dielectric layer 50 can be used for electrode placement, reducing the space occupied by the second electrode 30 on the wiring space of the flexible substrate 10. This provides more wiring space for the flexible substrate 10, facilitating the wiring design of other wires disposed on the flexible substrate 10 and improving the wiring integration on the flexible substrate 10.

[0058] The first electrode 20, the dielectric layer 50, and the second electrode 30 can form a capacitor. When the first part 11 of the flexible substrate 10 is deformed by external pressure, the first electrode 20 can deform along with the first part 11. As the first electrode 20 deforms under the action of external pressure, the distance between the first electrode 20 and the first surface 51 gradually decreases, and contact is formed. Since the dielectric constant of the dielectric layer 50 is much higher than that of the air separating the first electrode 20 and the first surface 51, the effective facing area of ​​the capacitor electrodes is the area of ​​the first electrode 20 in contact with the dielectric layer 50. By changing the contact area between the first electrode 20 and the dielectric layer 50, the capacitance value of the capacitor can change based on the change in the contact area. The contact area between the first electrode 20 and the first surface 51 can change according to the external pressure on the first part 11, thereby correlating the external pressure with the change in the capacitance value. By measuring the capacitance value, the magnitude of the external pressure on the first part 11 can be obtained.

[0059] In some embodiments, the flexible substrate 10 may further include a first conductive line 21. The first conductive line 21 may be electrically connected to the first electrode 20 and extends from the first portion 11 through the second portion 12 to the connecting portion 13, thereby enabling the first electrode 20 to be electrically connected to other devices outside the pressure sensor through the first conductive line 21. The first conductive line 21 may include an arcuate portion 22 located in the second portion 12. The arcuate portion 22 may be disposed along the edge of the second portion 12, thereby enabling the routing of the first conductive line 21 to better utilize the edge routing space of the second portion 12, leaving a larger routing space in the central position of the second portion 12, so as to facilitate the routing design of other conductive lines disposed on the flexible substrate 10 and improve the routing integration on the flexible substrate 10.

[0060] The pressure sensor provided in this embodiment integrates a first electrode 20, a first wire 21 connected to the first electrode 20, and a second wire 31 connected to the second electrode 30 on a folded flexible substrate 10. The first electrode 20 and the second electrode 30 are positioned opposite each other to form a capacitor. The arc-shaped portion 22 of the first wire 21 is arranged along the edge of the second portion 12. This allows for more efficient use of the wiring space of the flexible substrate 10 and provides a larger wiring space for the second wire 31. The integration of the first wire 21 connected to the first electrode 20 and the second wire 31 connected to the second electrode 30 is achieved, reducing the number of components in the pressure sensor. The pressure sensing function is realized with a simpler structure, reducing the size and cost of the pressure sensor.

[0061] In some embodiments, the first electrode 20 and the first wire 21 can be integrally formed components, thereby reducing production steps, reducing the number of parts, and reducing the cost of the pressure sensor. For example, the first electrode 20 and the first wire 21 can both be metal conductors disposed on the flexible substrate 10.

[0062] In some embodiments, the second electrode 30 may be a conductive structure coated on the second surface 52. For example, the second electrode 30 may be formed by coating the second surface 52 with silver paste. The thickness of the second electrode 30 may be reduced by the above process, thereby reducing the overall volume of the pressure sensor.

[0063] Figure 4 This is a schematic diagram of the structure of a flexible substrate, a first wire, and a second wire of a pressure sensor provided in an embodiment of this disclosure. Figure 5 This is a structural concept of a flexible substrate in a flattened state provided in an embodiment of this disclosure.

[0064] In some embodiments, such as Figure 4 and Figure 5 As shown, the flexible substrate 10 may also include a second wire 31. The first end of the second wire 31 may be a connection end 32. The connection end 32 may be disposed in the second part 12 and used to be electrically connected to the second electrode 30. The second end of the second wire 31 may extend to the connection part 13.

[0065] The width of the connection end 32 can be greater than the width of the second end of the second wire 31. By increasing the width of the connection end 32, the contact area between the connection end 32 and the second electrode 30 can be increased, thereby reducing the resistance between the connection end 32 and the second electrode 30 and improving the connection stability between the connection end 32 and the second electrode 30.

[0066] In some embodiments, the axis of symmetry of the connecting end 32 of the second conductor 31 may coincide with the axis of symmetry of the second part 12, so that the connecting end 32 is located in the central region of the second part 12. This utilizes the routing space left by the arcuate portion 22 of the first conductor 21. Furthermore, by placing the connecting end 32 in the central position of the second part 12, the distance between the connecting end 32 and the edge of the second part 12 can be increased, thereby reducing the limitations imposed by the edge of the second part 12 on the size and shape of the connecting end 32. This disclosure is not limited to this; the connecting end 32 may also coincide with the center of symmetry, geometric center, or other defined center marker of the second part 12.

[0067] In some embodiments, the connection end 32 of the second conductor 31 can be disc-shaped to reduce the resistance between the connection end 32 and the second electrode 30. Furthermore, the disc-shaped electrical connection structure can match the shape of the arcuate portion 22 of the first conductor 21 to reduce the additional gap between the connection end 32 and the arcuate portion 22 caused by shape differences. This allows for more efficient use of the routing space in the second part 12, thereby improving the area utilization rate of the first conductor 21 and the second conductor 31 in the second part 12. However, the shape and structure of the connection end 32 in the embodiments of this disclosure are not limited to a disc shape; the connection end 32 can also be configured with other shapes and structures having a larger electrical connection area.

[0068] Figure 6 This is a schematic diagram of the structure of a flexible substrate in a flat state that is connected to a conductive element, as provided in an embodiment of this disclosure.

[0069] In some embodiments, such as Figure 2 and Figure 6 As shown, the pressure sensor may further include a conductive element 40. One side of the conductive element 40 can be electrically connected to the second electrode 30, and the other side of the conductive element 40 can be electrically connected to the connection end 32, thereby allowing the second electrode 30 to be electrically connected to the other electrode through the conductive element 40. Furthermore, when the area of ​​the second electrode 30 is large, by making the sum of the thickness of the conductive element 40 and the thickness of the connection end 32 greater than the thickness of the arc-shaped portion 22, a distance can be maintained between the surface of the second electrode 30 and the arc-shaped portion 22, preventing the second electrode 30 from contacting the arc-shaped portion 22 and short-circuiting, thereby reducing the limitations imposed by the arc-shaped portion 22 on the area design of the second electrode 30.

[0070] In some embodiments, the conductive element 40 can be conductive adhesive, which enables the conductive element 40 to both conduct the second electrode 30 and the connection end 32 and to bond the second electrode 30 and the connection end 32. This eliminates the need for additional connecting parts on top of the conductive element 40 conducting the second electrode 30 and the connection end 32, reducing the number of components in the pressure sensor and achieving the pressure sensing function with a simpler structure, thus reducing the size and cost of the pressure sensor.

[0071] In some embodiments, the second electrode 30 may include a first connection surface connected to the dielectric layer 50, and the connection end 32 may include a second connection surface connected to the conductive element 40. The area of ​​the first connection surface may be larger than the area of ​​the second connection surface. Since the connection end 32 and the arc-shaped portion 22 are both disposed on the surface of the second portion 12, the size of the connection end 32 is kept within a range that prevents short circuits with the arc-shaped portion 22. The second electrode 30 is connected to the connection end 32 through the conductive element 40 and is spaced from the arc-shaped portion 22 through the conductive element 40, thereby preventing short circuits between the second electrode 30 and the arc-shaped portion 22. Therefore, the area of ​​the first connection surface of the second electrode 30 may be larger than the area of ​​the second connection surface of the connection end 32, thereby allowing the second electrode 30, as an electrode of the capacitor, to have a larger facing area.

[0072] In this design, by placing the second electrode 30 on the dielectric layer 50 and electrically connecting it to the connection terminal 32 of the second part 12 via the conductive element 40, the area of ​​the second electrode 30 is not limited by the wiring space of the second part 12. This allows for an increase in the area of ​​the second electrode 30, thereby expanding the capacitance value variation range of the capacitor, increasing the pressure measurement range of the pressure sensor, and providing more wiring space for the flexible substrate 10. This facilitates the wiring design of other wires on the flexible substrate 10 and improves the wiring integration on the flexible substrate 10.

[0073] Figure 7 This is another embodiment of the present disclosure showing a flexible substrate and conductive element in a flat state connected to a conductive element. Figure 8 yes Figure 1 A schematic diagram of the structure of region A in the middle.

[0074] In some embodiments, such as Figure 7 and Figure 8 As shown, the pressure sensor may further include an insulating layer 41, which may be disposed on the surface of the arcuate portion 22 facing the dielectric layer 50. One side of the conductive element 40 may be electrically connected to the second electrode 30, and the other side of the conductive element 40 may be connected to the connection end 32 and the insulating layer 41. By adding an insulating layer 41 to the surface of the arcuate portion 22 facing the dielectric layer 50, the conductive element 40 can contact the insulating layer 41, thereby increasing the contact area between the conductive element 40 and the second portion 12 and the wiring disposed on the second portion 12, and improving the connection stability between the conductive element 40 and the second portion 12.

[0075] In some embodiments, the insulating layer 41 can be an insulating coating, thereby reducing the volume of the insulating layer 41 and the thickness of the first conductor 21, thereby improving the flexibility of the first conductor 21 so that the first conductor 21 can be bent and routed together with the flexible substrate 10.

[0076] Figure 9 This is a schematic diagram of the first surface of the dielectric layer of a pressure sensor provided in an embodiment of this disclosure.

[0077] In some embodiments, such as Figure 9 As shown, the pressure sensor may also include a support 70, which may be disposed along the edge of the first surface 51 to expose the middle portion of the first surface 51 so that the first electrode 20 may contact the middle portion of the first surface 51 during deformation.

[0078] One side of the support member 70 can be connected to the first surface 51, and the other side of the support member 70 can be connected to the first electrode 20. This allows the first surface 51 and the first electrode 20 to maintain a distance when the first part 11 is not subjected to external pressure. Since the first surface 51 and the first electrode 20 do not contact each other in the default state, the contact area between the first electrode 20 and the first surface 51 can gradually increase from zero during the deformation of the first electrode 20. This increases the range of capacitance value variation and improves the pressure measurement range of the pressure sensor.

[0079] In some embodiments, such as Figure 9 As shown, the support member 70 can be an annular insulating member, which can prevent the first electrode 20 and the dielectric layer 50 from conducting through the support member 70. It can also make the support member 70 uniformly support the edge of the first electrode 20 and the edge of the first surface 51, thereby increasing the exposed area of ​​the middle part of the first surface 51, so that the first surface 51 and the first electrode 20 can have a larger contact area, thereby increasing the capacitance value variation range and improving the pressure measurement range of the pressure sensor.

[0080] In some embodiments, such as Figure 1 and Figure 2 As shown, the pressure sensor may include a housing 60, and a flexible substrate 10 and a dielectric layer 50 may be disposed within the housing 60. The housing 60 can provide protection for the flexible substrate 10 and the dielectric layer 50, and can also provide mounting and fixing for the flexible substrate 10 and the dielectric layer 50.

[0081] The housing 60 may include a first opening 63 and a second opening 64. The first opening 63 allows the connecting part 13 to extend out of the housing 60 so that the connecting part 13 can be electrically connected to other external devices. The second opening 64 exposes the first part 11 so that external pressure can be applied to the first part 11, causing the first part 11 to deform.

[0082] In some embodiments, the housing 60 can be formed by processes such as mechanical assembly, low-temperature injection molding, and low-temperature potting, thereby reducing the production cost of the housing 60 and the overall cost of the pressure sensor.

[0083] In some embodiments, the housing 60 may include a first housing 61 and a second housing 62. The first housing 61 may have a second opening 64 to expose the first part 11. The second housing 62 may be closed with the first housing 61 to form a receiving space, and the flexible substrate 10 and the dielectric layer 50 may be received within the receiving space. The edges of the first housing 61 and the second housing 62 may have notches, and the notches of the first housing 61 and the second housing 62 may be closed to form a first opening 63. The first opening 63 may be used to allow the connecting part 13 to extend out of the first opening 63 of the housing 60, so that the connecting part 13 can be electrically connected to other external devices.

[0084] Figure 10 This is a schematic diagram of the structure of a stylus provided in an embodiment of this disclosure. Figure 11 This is a schematic diagram of the cross-sectional structure of the tip of a stylus provided in an embodiment of this disclosure.

[0085] Based on the same concept, this disclosure also provides a stylus, such as... Figure 10 and Figure 11 As shown, the stylus may include: a pen body 80 and a pressure sensor 100. The pen body 80 can be the functional integration carrier and structural support body of the stylus. The pressure sensor 100 can be set inside the pen body 80. The pressure sensor 100 can convert the pressure signal of the user using the stylus into an electrical signal through its own pressure detection function, so that the stylus can recognize the slight force applied to the pen body 80, and further determine whether the user is writing. It can also correct the handwriting according to the pressure, so that the comparison can change with the user's pressure.

[0086] The stylus provided in this embodiment integrates a first electrode 20, a first wire 21 connected to the first electrode 20, and a second wire 31 connected to the second electrode 30 on a folded flexible substrate 10. This allows the first electrode 20 and the second electrode 30 to face each other and form a capacitor. The arc-shaped portion 22 of the first wire 21 is arranged along the edge of the second portion 12, which makes full use of the wiring space of the flexible substrate 10 and provides a larger wiring space for the second wire 31. This integration of the first wire 21 connected to the first electrode 20 and the second wire 31 connected to the second electrode 30 reduces the number of components in the pressure sensor 100, achieves pressure sensing function with a simpler structure, reduces the space occupied by the pressure sensor 100 in the internal installation of the stylus, and lowers the production cost of the stylus.

[0087] In some embodiments, such as Figure 11As shown, the stylus may include a pen tip 81 and an elastic element 90. The pen tip 81 is the end that contacts the touchscreen when the stylus is in operation. The elastic element 90 may be disposed within the pen body 80, with one end of the elastic element 90 connected to the pen tip 81 and the other end of the elastic element 90 abutting against the first part 11. When the user writes with the stylus, the pen tip 81 is subjected to the interaction force from the touchscreen. Under the pressure of the pen tip 81, the elastic element 90 can squeeze the first part 11 of the flexible substrate 10, causing the first part 11 to deform and contact the first surface 51, thereby changing the capacitance value. This converts the change in pressure value into a change in capacitance value, realizing the pressure detection function of the pressure sensor 100.

[0088] In this scenario, when the elastic element 90 presses the first part 11 into contact with the first surface 51, the elastic element 90 can indirectly contact the first surface 51 through the first part 11. The part of the elastic element 90 that contacts the first part 11 stops deforming, thereby causing the other parts of the elastic element 90 to deform and contact the first part 11 during further pressing. The deformation process of the elastic element 90 causes the contact area between the elastic element 90 and the first part 11 to increase as the pressure on the pen tip 81 increases, thereby causing a larger area of ​​the first part 11 and the first electrode 20 to be pressed by the elastic element 90 and contact the first surface 51. This achieves a positive correlation between the contact area between the first electrode 20 and the first surface 51 and the pressure, realizing the pressure detection function of the pressure sensor 100.

[0089] In some embodiments, such as Figure 11 As shown, the surface of the elastic element 90 that abuts against the first part 11 is an arc-shaped surface. Before the first electrode 20 contacts the dielectric layer 50, the first electrode 20 is deformed into an arc shape under the action of the elastic element 90 and moves closer to the dielectric layer 50. The contact area between the arc-shaped first electrode 20 and the dielectric layer 50 can gradually increase from zero. The arc-shaped surface of the elastic element 90 and the arc-shaped first electrode 20 can be flattened as the pressure gradually increases, and the contact area gradually increases, so that the contact area between the first electrode 20 and the first surface 51 can exhibit a linear change. This allows the change in capacitance value to more accurately and intuitively reflect the change in pressure value, improving the pressure detection effect of the pressure sensor 100.

[0090] In some embodiments, since the support member 70 is spaced between the first surface 51 and the first electrode 20, maintaining a distance between them, the first surface 51 and the first electrode 20 do not contact each other in the default state. When the pen body 80 is pressed, the elastic member 90 can press against the first part 11, which is the pressure sensing area, and at this time, the first part 11 of the flexible substrate 10 begins to deform slightly. As the external pressure gradually increases, the first electrode 20 begins to contact the first surface 51, and the contact area also gradually increases with the pressure. The first electrode 20 can be electrically connected to the connection part 13 through the first wire 21. The connection part 13 can be connected to external devices such as processors or motherboards, so that the first electrode 20 can be electrically connected to the processor or motherboard. The area of ​​the connection end 32 of the second wire 31, the conductive member 40, and the second electrode 30, as well as the contact area between the three, remain constant throughout the pressure change process. The second electrode 30 can also be led to the processor or motherboard through the conductive member 40 and the second wire 31, thereby leading to the capacitance change value of the capacitor being led to the processor or motherboard. As the contact area between the first surface 51 and the first electrode 20 increases, the capacitance value of the capacitor formed by the first electrode 20, the dielectric layer 50, and the second electrode 30 also gradually increases from zero. The processor or motherboard can obtain the pressure value corresponding to the capacitance value change based on the capacitance value change, and thus obtain the pressure magnitude on the pen body 80.

[0091] Based on the same principle, as the external pressure gradually decreases, the first electrode 20 and the first part 11 can gradually return to their original state using their own elasticity. During this process, the contact area between the first electrode 20 and the first surface 51 gradually decreases until the two separate and no longer contact each other, and the change in capacitance value also gradually decreases to zero.

[0092] It should be understood that all the embodiments described above can be combined with each other without conflict, and for any part not described in detail in a certain embodiment, please refer to the relevant description in other embodiments.

[0093] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0094] In the description of this disclosure, unless otherwise specified or stated, the term "a plurality of" means at least two; unless otherwise specified or stated, the terms "joining," "attaching," "installing," "connecting," and "linking" should be interpreted broadly, for example, they can be fixed connections or movable connections; they can be non-detachable connections or detachable connections, and non-detachable connections can be integral connections or welded connections; they can be mechanical connections or electrical connections; they can be internal communication between two components or the interaction between two components; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0095] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0096] In the description of this disclosure, directional terms are used to locate components in accordance with the accompanying drawings, including but not limited to spatial relationship descriptors such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential." Since the described components can be located in multiple different orientations, these directional terms are for illustrative purposes only and do not constitute limitations. This technical solution allows for adjustments to the implementation without departing from the design concept, including but not limited to structural or logical changes; therefore, the detailed description in this disclosure should not be construed as a limitation of this technical solution.

[0097] It should be noted that although the terms "first," "second," etc., are used herein to describe different modules, steps, and data in the embodiments of this disclosure, these terms are only for distinguishing between different modules, steps, and data, and do not indicate a specific order or degree of importance. In fact, the terms "first," "second," etc., can be used interchangeably.

[0098] The foregoing description of embodiments of this disclosure has been provided for purposes of illustration and description. The foregoing description is not exhaustive and is not intended to limit this disclosure to the exact forms disclosed; various modifications and variations may be made in accordance with the foregoing teachings, or may be derived from practice of this disclosure. These embodiments were chosen and described to illustrate the principles of this disclosure and its practical application, enabling those skilled in the art to utilize this disclosure in various implementations and with various modifications to suit the particular purpose conceived.

Claims

1. A pressure sensor, characterized in that, include: The flexible substrate (10) includes a first part (11), a second part (12) and a connecting part (13) connected in sequence, and the first part (11) is opposite to the second part (12); The flexible substrate (10) includes a first conductor (21) extending from the first portion (11) to the connecting portion (13). The first conductor (21) includes an arcuate portion (22) located in the second portion (12), and the arcuate portion (22) is disposed along the edge of the second portion (12). A dielectric layer (50) is disposed between the first part (11) and the second part (12), including a first surface (51) and a second surface (52) facing each other, the first surface (51) facing the first part (11) and the second surface (52) facing the second part (12). A first electrode (20) is disposed on the first part (11) and electrically connected to the first wire (21), and a gap exists between the first electrode (20) and the first surface (51); and The second electrode (30) is disposed on the second surface (52) and electrically connected to the second part (12). The first electrode (20), the dielectric layer (50) and the second electrode (30) form a capacitor. The contact area between the first electrode (20) and the first surface (51) varies according to the external pressure on the first part (11), and the capacitance value of the capacitor is based on the change in the contact area.

2. The pressure sensor of claim 1, wherein, The flexible substrate (10) further includes: The second wire (31) has a first end as a connection end (32), which is disposed in the second part (12) and electrically connected to the second electrode (30). The second end of the second wire (31) extends to the connection part (13). The width of the connecting end (32) of the second conductor (31) is greater than the width of the second end, and the axis of symmetry of the connecting end (32) of the second conductor (31) coincides with the axis of symmetry of the second part (12).

3. The pressure sensor according to claim 2, characterized in that, Also includes: A conductive element (40) is provided, one side of which is electrically connected to the second electrode (30), and the other side of which is electrically connected to the connection end (32). The sum of the thickness of the conductive element (40) and the thickness of the connecting end (32) is greater than the thickness of the arc-shaped portion (22).

4. The pressure sensor according to claim 3, characterized in that, The second electrode (30) includes a first connection surface connected to the dielectric layer (50); The connecting end (32) includes a second connecting surface connected to the conductive element (40); The area of ​​the first connecting surface is greater than the area of ​​the second connecting surface.

5. The pressure sensor according to claim 3, characterized in that, The pressure sensor also includes: An insulating layer (41) is disposed on the surface of the arcuate portion (22) facing the dielectric layer (50), and the other side of the conductive element (40) is also connected to the insulating layer (41).

6. The pressure sensor according to claim 1, characterized in that, Also includes: A support member (70) is provided along the edge of the first surface (51), and one side of the support member (70) is connected to the first surface (51), and the other side of the support member (70) is connected to the first electrode (20), so that the first surface (51) and the first electrode (20) are spaced apart.

7. The pressure sensor according to claim 1, characterized in that, The pressure sensor includes: The housing (60) is provided with the flexible substrate (10) and the dielectric layer (50) inside the housing (60); The housing (60) includes a first opening (63) and a second opening (64), the first opening (63) being used to allow the connecting part (13) to extend out of the housing (60); The second opening (64) is used to expose the first part (11).

8. A stylus, characterized in that, include: Pen style (80); The pressure sensor as described in any one of claims 1-7, wherein the pressure sensor (100) is disposed within the pen body (80).

9. The stylus of claim 8, wherein, include: Pen nib (81); An elastic element (90) is disposed inside the pen body (80). One end of the elastic element (90) is connected to the pen tip (81), and the other end of the elastic element (90) abuts against the first part (11). The elastic element (90) squeezes the first part (11) according to the pressure on the pen tip (81) so that the first part (11) deforms.

10. The stylus according to claim 9, characterized in that, The surface of the elastic element (90) that abuts against the first part (11) is an arc-shaped surface.

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