Capacitive induction button, device, method and storage medium

Abstract

The embodiment of the present application relates to the field of key technology, and discloses a capacitive inductive key, device, method and storage medium. The capacitive inductive key of the present application includes: a base and a moving component; the moving component penetrates the top surface of the base, and the moving component reciprocates perpendicular to the top surface; the moving component includes a mandrel and a conductor plate fixed relative to the mandrel; the base includes a base, a main plate and a secondary plate fixed relative to the base; the conductor plate is respectively arranged relative to the main plate and the secondary plate; the main plate includes a plate assembly, and the plate assembly includes two first plates and a second plate, and the two first plates are symmetrically arranged on both sides of the second plate; there is a first gap between one first plate and the second plate, and there is a second gap between the other first plate and the second plate, and the extension direction of the first gap and the second gap is different from the reciprocating motion direction. The key displacement detection accuracy of the capacitive inductive key of the present embodiment is high.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of button technology, and in particular to a capacitive sensing button, device, method and storage medium. Background Art

[0002] At present, electronic devices with keypads are widely used in production and life, such as keyboards, computers and other equipment. Taking keyboard keys as an example, conventional keyboard keys can only detect two states: on and off. Currently, there is a magnetic axis key on the market that can detect the displacement of the key by detecting the strength of the magnetic field received by the chip when the key is pressed, thus realizing the measurement of the intermediate process.

[0003] However, current magnetic axis buttons have uneven sensitivity and are easily affected by external magnetic interference, resulting in low accuracy in detecting button displacement. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a capacitive sensing button, device, method and storage medium, so as to improve the accuracy of button displacement detection.

[0005] To solve the above technical problems, an embodiment of the present application provides a capacitive induction key, comprising: a base and a moving component; the moving component passes through the top surface of the base, and the moving component reciprocates perpendicular to the top surface; the moving component comprises a core shaft and a conductor plate fixed relative to the position of the core shaft; the base comprises a base, a main plate and a secondary plate fixed relative to the position of the base; the conductor plate is arranged relative to the main plate and the secondary plate respectively; the main plate comprises a plate assembly, the plate assembly comprises two first plates and a second plate, and the two first plates are symmetrically arranged on both sides of the second plate; there is a first gap between one of the first plates and the second plate, and there is a second gap between the other first plate and the second plate, and the extension direction of the first gap and the second gap is different from the reciprocating motion direction; wherein, the first plate, the conductor plate and the secondary plate together form a first capacitor, and the second plate, the conductor plate and the secondary plate together form a second capacitor; when the core shaft reciprocates, the capacitance signals of the first capacitor and the second capacitor change.

[0006] An embodiment of the present application further provides an electronic device, comprising: a housing and a plurality of the above-mentioned capacitive sensing buttons arranged in the housing.

[0007] An embodiment of the present application further provides a key detection method, comprising: detecting a capacitance signal generated by the capacitor; and determining a movement distance of the key according to a change in the capacitance signal.

[0008] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above-mentioned key detection method when executed by a processor.

[0009] In some embodiments, the main plate includes a plurality of plate assemblies; the plurality of plate assemblies are disposed on the inner side wall of the base, and the plurality of plate assemblies are arranged perpendicular to the reciprocating motion direction.

[0010] In some embodiments, in two adjacent electrode plate assemblies, the first electrode plate of one electrode plate assembly is adjacent to and integrally arranged with the first electrode plate of the other electrode plate assembly.

[0011] In some embodiments, in one of the pole plate assemblies, the lengths of the first gap and the second gap in the reciprocating direction are equal to the length of the pole plate assembly in the reciprocating direction; the lengths of the first gap and the second gap in the target direction are equal to half the width of the pole plate assembly in the target direction; the target direction is a direction perpendicular to the reciprocating direction and parallel to the surface of the main pole plate close to the conductor plate.

[0012] In some embodiments, the conductor plate is located on an outer side wall of the core shaft, and the main pole plate and the secondary pole plate are located on the same inner side wall of the base.

[0013] In some embodiments, the number of the conductor plates is two, and the two conductor plates are respectively arranged on different outer side walls of the core shaft; the two conductor plates are connected by wires; the main pole plate and the secondary pole plate are located on different inner side walls of the base, the main pole plate is arranged opposite to one of the conductor plates, and the secondary pole plate is arranged opposite to the other conductor plate.

[0014] In some embodiments, the capacitive sensing button also includes a shaft seat; the shaft seat includes a first interface, a second interface, and a third interface, the main pole plate includes a first pin and a second pin, and the secondary pole plate includes a third pin; the first interface is connected to the first pin, and the first pin is connected to each of the first pole plates in the main pole plate; the second interface is connected to the second pin, and the second pin is connected to each of the second pole plates in the main pole plate; the third interface is connected to the third pin.

[0015] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0016] In this embodiment, a conductor plate, a main plate, and a secondary plate are arranged in the key structure. The conductor plate is arranged opposite to the main plate and the secondary plate, respectively. The conductor plate is fixed relative to the mandrel, and the main plate and the secondary plate are fixed relative to the base. When the key is pressed or popped up, the mandrel drives the conductor plate to move downward or upward, and the relative area between the conductor plate and the first plate of the main plate, the relative area between the conductor plate and the second plate of the main plate, and the relative area between the conductor plate and the secondary plate change, thereby causing the capacitance signals of the first capacitor and the second capacitor to change. According to the changes in the first capacitor and the second capacitor, the movement distance of the key can be judged, the middle position of the key can be determined, and the accuracy of the key displacement detection can be improved. In addition, on the basis of being able to accurately determine the displacement of the mandrel, any trigger stroke can be set on the key, the trigger time can be adjusted, etc., to bring different tactile experiences to the user, and multi-level triggers can be designed on a single key to enrich the tactile experience of a single key. The key of this embodiment is provided with the above-mentioned conductor plate, main electrode plate and auxiliary electrode plate. When the conductor plate is twisted when the key is pressed or popped out, the influence of the twisting of the conductor plate on the capacitance generated by the two first electrodes can offset each other, thereby reducing the change in the first capacitance. The influence of the twisting of the conductor plate on the capacitance generated by the second electrode plate can also offset each other, thereby reducing the change in the second capacitance, thereby offsetting the capacitance deviation caused by the twisting of the conductor plate, improving the accuracy of capacitance detection, and further improving the accuracy of key position detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 is a schematic diagram of an exploded structure of a capacitive sensing button according to an embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of a capacitive induction button according to an embodiment of the present application;

[0020] Figure 3 is a schematic cross-sectional structure diagram of a capacitive sensing button according to an embodiment of the present application;

[0021] Figure 4 is a structural schematic diagram of a plate assembly of a main plate in a capacitive induction key according to an embodiment of the present application;

[0022] Figure 5 is a schematic structural diagram of a capacitor structure according to an embodiment of the present application when twisting occurs;

[0023] Figure 6is a schematic structural diagram of a main pole plate according to an embodiment of the present application;

[0024] Figure 7 is a schematic structural diagram of a moving component in a capacitive sensing key according to an embodiment of the present application;

[0025] Figure 8 is a structural schematic diagram of a base in a capacitive induction key according to an embodiment of the present application;

[0026] Fig. 9 is a schematic diagram of an exploded structure of a capacitive sensing button according to an embodiment of the present application;

[0027] Fig.10 According to an embodiment of the present application Figure 1 A schematic diagram of the structure of the corresponding capacitive induction button center axis seat;

[0028] Fig.11 According to an embodiment of the present application Figure 1 The structural diagram of the corresponding capacitive induction button center axis seat packaging SMT patch;

[0029] Fig.12 According to an embodiment of the present application Fig. 9 A schematic diagram of the structure of the corresponding capacitive induction button center axis seat;

[0030] Fig.13 According to an embodiment of the present application Fig. 9 Schematic diagram of the structure of the corresponding capacitive sensing button center axis seat packaging SMT patch. DETAILED DESCRIPTION

[0031] In order to solve the problem that the magnetic axis key in the related art has uneven sensitivity and is easily affected by external magnetic interference, resulting in low detection accuracy of the key displacement, an embodiment of the present application relates to a capacitive sensing key, including: a base and a moving component; the moving component penetrates the top surface of the base, and the moving component reciprocates perpendicular to the top surface; the moving component includes a core shaft and a conductor plate fixed relative to the core shaft; the base includes a base, a main pole plate and a secondary pole plate fixed relative to the base; the conductor plate is respectively arranged relative to the main pole plate and the secondary pole plate; the main pole plate includes a pole plate assembly, the pole plate assembly includes two first pole plates and a second pole plate, and the two first pole plates are symmetrically arranged on both sides of the second pole plate; there is a first gap between one first pole plate and the second pole plate, and there is a second gap between the other first pole plate and the second pole plate, and the extension direction of the first gap and the second gap is different from the reciprocating motion direction; wherein the first pole plate, the conductor plate and the secondary pole plate jointly form a first capacitor, and the second pole plate, the conductor plate and the secondary pole plate jointly form a second capacitor; when the core shaft reciprocates, the capacitance signals of the first capacitor and the second capacitor change.

[0032] In this embodiment, a conductor plate, a main pole plate, and a secondary pole plate are arranged in the key structure. The conductor plate is respectively arranged opposite to the main pole plate and the secondary pole plate, the conductor plate is relatively fixed to the core shaft, and the main pole plate and the secondary pole plate are relatively fixed to the base; when the key is pressed or popped up, the core shaft drives the conductor plate to move downward or upward, and the relative area of ​​the conductor plate and the first pole plate of the main pole plate, the relative area of ​​the conductor plate and the second pole plate of the main pole plate, and the relative area of ​​the conductor plate and the secondary pole plate change, thereby causing the capacitance signals of the first capacitor and the second capacitor to change. According to the changes in the first capacitor and the second capacitor, the moving distance of the key can be judged, the middle position of the key can be determined, and the accuracy of the key displacement detection can be improved.

[0033] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0034] like Figure 1 FIG. 1 is a schematic diagram of the exploded structure of the capacitive induction button of this embodiment. Figure 2 As shown in FIG. 1 , it is a schematic diagram of the structure of the capacitive induction button of this embodiment. Figure 3 As shown in FIG. 1 , a cross-sectional structure diagram of a capacitive inductive key of this embodiment is shown in FIG. Figure 4 , which is a schematic structural diagram of a plate assembly of a main plate in a capacitive inductive keypad of the present embodiment. The capacitive inductive keypad of the present embodiment includes: a base 1 and a moving assembly 2.

[0035] Specifically, the motion component 2 penetrates the top surface of the base 1, and the motion component 2 reciprocates perpendicular to the top surface; the motion component 2 includes a core shaft 21, a conductor plate 22 fixed relative to the core shaft 21, and the base 1 includes a base 11, a main pole plate 12 and a secondary pole plate 13 fixed relative to the base 11; the conductor plate 22 is respectively arranged relative to the main pole plate 12 and the secondary pole plate 13; the main pole plate 12 includes a pole plate assembly (not shown in the figure), and the pole plate assembly includes two first pole plates 121 and a second pole plate 122, and the two first pole plates 121 are symmetrically arranged at On both sides of the second electrode plate 122; there is a first gap L1 between a first electrode plate 121 and the second electrode plate 122, and there is a second gap L2 between the other first electrode plate 121 and the second electrode plate 122, and the extension direction of the first gap and the second gap is different from the reciprocating motion direction; wherein, the first electrode plate 121, the conductor plate 22 and the secondary electrode plate 13 together form a first capacitor, and the second electrode plate 122, the conductor plate 22 and the secondary electrode plate 13 together form a second capacitor; when the core shaft 21 reciprocates, the capacitance signals of the first capacitor and the second capacitor change.

[0036] Specifically, the capacitive sensing button of the present embodiment also includes a shaft seat 3, the main pole plate 12 includes a first pin pin1, a second pin pin2, and a ground pin GND, the secondary pole plate 13 includes a third pin pin3, the first pin pin1, the second pin pin2, the third pin pin3, and the ground pin GND pass through the bottom of the base 11 and are connected to the corresponding interface on the shaft seat 3; the motion component 2 of the present embodiment also includes a cover plate 23, the cover plate 23 includes a hollow area, the cover plate 23 covers the core shaft 21, and the top surface of the core shaft 21 exposes the surface of the cover plate 23 through the hollow area.

[0037] Specifically, the conductor plate 22 is generally a conductive metal, which is fixed on the core shaft 21 to form a complete structure and moves up and down following the pressing of the core shaft 21; the secondary plate 13 can be manufactured by metal stamping; the main plate 12 can be manufactured using a PCB board, or it can be manufactured using an FPC or a metal sheet.

[0038] In the key structure of this embodiment, the conductor plate 22, the main pole plate 12, and the secondary pole plate 13 are arranged opposite to the main pole plate 12 and the secondary pole plate 13 respectively, the conductor plate 22 is relatively fixed to the core shaft 21, and the main pole plate 12 and the secondary pole plate 13 are relatively fixed to the base 11; when the key is pressed or popped up, the core shaft 21 drives the conductor plate 22 to move downward or upward, and the relative area between the conductor plate 22 and the first pole plate 121 of the main pole plate 12, the relative area between the conductor plate 22 and the second pole plate 122 of the main pole plate 12, and the relative area between the conductor plate 22 and the secondary pole plate 13 change, so that the capacitance signals of the first capacitor and the second capacitor change. According to the changes of the first capacitor and the second capacitor, the moving distance of the key can be judged, the middle position of the key can be determined, the detection of the whole process during the key pressing process is realized, and the accuracy of the key displacement detection is improved. Compared with the magnetic axis solution, this embodiment has the advantages of good linearity, strong anti-interference ability, low power consumption, etc. Moreover, based on the ability to accurately determine the displacement of the core shaft 21, any trigger stroke can be set on the key, the trigger time can be adjusted, etc., to give the user a different tactile experience, and multi-level triggers can be designed on a single key to enrich the tactile experience of a single key.

[0039] Furthermore, in this embodiment, by setting the above-mentioned key structure, when the conductor plate 22 is twisted when the key is pressed or popped out, the effects of the twisting of the conductor plate 22 on the capacitance generated by the two first plates 121 can offset each other, thereby reducing the change in the first capacitance, and the effects of the twisting of the conductor plate 22 on the capacitance generated by the second plate 122 can also offset each other, thereby reducing the change in the second capacitance, thereby offsetting the capacitance deviation caused by the twisting of the conductor plate 22, improving the accuracy of capacitance detection, and further improving the accuracy of key position detection.

[0040] Specifically, the conductor plate 22, the main electrode plate 12, and the secondary electrode plate 13 in the key of this embodiment form a capacitor structure. In the figure, the conductor plate 22 reciprocates up and down, and the conductor plate 22 is provided with a fixed stroke amount, and the conductor plate 22 reciprocates within the fixed stroke amount along the reciprocating direction. Among them, the conductor plate 22 is located on the outer side wall of the core shaft 21, and the main electrode plate 12 and the secondary electrode plate 13 are located on the inner side wall of the base 11.

[0041] Specifically, the main plate 12 includes a plate assembly, which includes two first plates 121 and a second plate 122; the first plates 121 and the second plates 122 are arranged on the same plane perpendicular to the reciprocating motion direction, and the two first plates 121 are symmetrically arranged on both sides of the second plate 122; the auxiliary plate 13 is arranged opposite to the main plate 12. It should be noted that the main plate 12 may include: Figure 4 The plate assembly shown may also include a plurality of Figure 4 The plate assembly shown.

[0042] Among them, in order to change the capacitance signals of the first capacitor and the second capacitor when the core shaft 21 reciprocates, the length of the first electrode 121 in the reciprocating direction and the length of the second electrode 122 in the reciprocating direction are both greater than the stroke of the conductor plate 22 in the reciprocating direction; thereby ensuring that when the core shaft 21 reciprocates, the relative area between the conductor plate 22 and the first electrode 121, the second electrode 122 changes, and the relative area between the conductor plate 22 and the secondary electrode 13 changes, thereby changing the capacitance signals of the first capacitor and the second capacitor. According to the changes in the first capacitor and the second capacitor, the moving distance of the key can be judged, the middle position of the key can be determined, and the accuracy of the key displacement detection is improved.

[0043] Specifically, a first gap L1 exists between one first electrode plate 121 and the second electrode plate 122 , and a second gap L2 exists between the other first electrode plate 121 and the second electrode plate 122 . The extending directions of the first gap L1 and the second gap L2 are different from the reciprocating motion direction.

[0044] Specifically, in this embodiment, the two first pole plates 121 are of the same size and shape, and are symmetrically arranged on both sides of the second pole plate 122, and symmetrically arranged along the central axis of the second pole plate 122. Therefore, the first gap L1 between one first pole plate 121 and the second pole plate 122 and the second gap L2 between the other first pole plate 121 and the second pole plate 122 are also the same in shape and size, and the first gap L1 and the second gap L2 are symmetrically arranged along the central axis of the second pole plate 122, and the direction of the central axis of the second pole plate 122 is the same as the reciprocating motion direction of the core shaft 21.

[0045] Specifically, the extension directions of the first gap L1 and the second gap L2 are different from the reciprocating direction of the core shaft 21, that is, there is an angle between the first gap L1 and the reciprocating direction of the core shaft 21, and there is also a symmetrical angle between the second gap L2 and the reciprocating direction of the core shaft 21; when the conductor plate 22 follows the reciprocating motion of the core shaft 21, the first capacitor and the second capacitor both change, and the displacement of the conductor plate 22 can be determined based on the changes in the first capacitor and the second capacitor, thereby determining the displacement of the key.

[0046] like Figure 5As shown, it is a schematic diagram of the structure when the capacitor structure of this embodiment is twisted, and the dotted line is the central axis of the second electrode plate 122, and the conductor plate 22 rotates with the dotted line as the axis. When the conductor plate 22 is twisted during the movement of the mandrel 21, the distance between point A and the first electrode plate 121 is large, and the distance between point D and the other first electrode plate 121 is small. The relationship between points A, B, C, and D in the conductor plate 22 and the main electrode plate 12 is large-medium-large-medium-small-small. For points A and D, their opposite positions are both the first electrode plate 121, so the effects of the twisting cancel each other out. Similarly, the effects of the twisting at points B and C also cancel each other out, and it can be approximately considered that the equivalent distances of the two first electrodes 121 from the conductor plate 22 and the equivalent distances of the second electrode plate 122 from the conductor plate 22 are equal to the equivalent distances of point O on the central axis from the conductor plate 22, thereby compensating for the effects of the twisting, improving the accuracy of the capacitance detection, and further improving the accuracy of the key displacement detection.

[0047] Specifically, in a plate assembly, the two first plates 121 and the second plate 122 together form a rectangular parallelepiped; the length of the first gap L1 and the second gap L2 in the reciprocating direction of the core shaft 21 is equal to the length of the plate assembly in the reciprocating direction of the core shaft 21; the length of the first gap L1 and the second gap L2 in the target direction is equal to half the width of the plate assembly in the target direction; the target direction is a direction perpendicular to the reciprocating direction of the core shaft 21 and parallel to the surface of the main plate 12 close to the conductor plate 22.

[0048] In one embodiment, in a plate assembly, the extension direction of the first gap L1 and the second gap L2 is a straight line, such as Figure 4 As shown, from bottom to top, the distance between the first gap L1 and the second gap L2 increases linearly, and the first gap L1 and the second gap L2 are V-shaped. Specifically, the first gap L1 extends from the midpoint of the bottom of the cuboid to the left vertex of the cuboid, and the second gap L2 extends from the midpoint of the bottom of the cuboid to the right vertex of the cuboid. In this embodiment, by setting the extension direction of the first gap L1 and the second gap L2 to a straight line, when the conductor plate 22 moves in the reciprocating direction with the core shaft 21, the area of ​​the conductor plate 22 facing the first electrode plate 121 and the second electrode plate 122 changes linearly, and the change of the relationship (C1-C2) / (C1+C2) is only related to the change of the facing area. The relationship (C1-C2) / (C1+C2) can not only offset the influence of the distance between the electrodes, but also change linearly with the change of the facing area, thereby further improving the accuracy of capacitance detection and the accuracy of key position detection.

[0049] In other embodiments, the extension direction of the first gap L1 and the second gap L2 can be a curve, and the distance between the first gap L1 and the second gap L2 only needs to gradually increase from bottom to top. For example, the first gap L1 and the second gap L2 are U-shaped.

[0050] Specifically, when the conductor plate 22 is not twisted, the distance between the conductor plate 22 arranged opposite to the main plate 12 and the first plate 121 and the second plate 122 is d. Since the conductor plate 22 is arranged opposite to the secondary plate 13, it is equivalent to shortening the distance between the secondary plate 13 and the main plate 12. The position of the conductor plate 22 arranged opposite to the main plate 12 can be used as the position of the secondary plate 13 to determine the first capacitor and the second capacitor. According to the capacitance formula, the first capacitor C1=2εS1 / 4πkd and the second capacitor C2=εS2 / 4πkd are calculated, where ε is the dielectric constant of the medium, k is the electrostatic force constant, S1 is the facing area of ​​the first plate 121 and the conductor plate 22, and S2 is the facing area of ​​the second plate 122 and the conductor plate 22. Then, the relationship (C1-C2) / (C1+C2) is calculated, (C1-C2) / (C1+C2)=(2S1-S2) / (2S1+S2).

[0051] When the conductor plate 22 is twisted, Figure 5 As shown, the distance between the conductor plate 22 and the second electrode plate 122 is d, the equivalent distance between point A of the conductor plate 22 and one first electrode plate 121 is d+x, and the equivalent distance between point D of the conductor plate 22 and another first electrode plate 121 is dx, where x is the torsion distance of the conductor plate 22. According to the capacitance formula, the first capacitance C1=εS1 / 4πk(dx)+εS1 / 4πk(d+x) and the second capacitance C2=εS2 / 4πkd can be calculated, where ε is the dielectric constant, k is the electrostatic force constant, S1 is the facing area between the first electrode plate 121 and the conductor plate 22, and S2 is the facing area between the second electrode plate 122 and the conductor plate 22. Then, the relationship between (C1-C2) / (C1+C2) is calculated as follows:

[0052] (C1-C2) / (C1+C2)=[εS1 / 4πk(dx)+εS1 / 4πk(d+x)-εS2 / 4πkd] / (εS1 / 4πk(dx)+εS1 / 4πk(d+x)+εS2 / 4πkd)=[2S1d 2 -S2(d 2 -x 2 )] / [2S1d 2 +S2(d 2 -x 2 )].

[0053] According to the relationship (C1-C2) / (C1+C2), it can be seen that in the case of torsion, when the torsion distance x of the conductor plate 22 is much smaller than d, the relationship (C1-C2) / (C1+C2) is close to the case where no torsion occurs, and the influence of the torsion of the conductor plate 22 on the relationship (C1-C2) / (C1+C2) can be ignored; while in the capacitor structure, the torsion distance x of the conductor plate 22 is generally much smaller than the value of d. Therefore, in this embodiment, through the above-mentioned capacitor structure, when the conductor plate 22 is twisted by a small distance, the relationship (C1-C2) / (C1+C2) can still offset the influence of the plate spacing, thereby improving the accuracy of capacitance detection, and further improving the accuracy of key position detection.

[0054] However, when the torsion distance x of the conductor plate 22 is large, the accuracy of using only one plate assembly will also be reduced, and there will be some situations where it cannot be fully compensated. Therefore, in order to further solve the problem of poor capacitance detection accuracy caused by large torque, this embodiment sets multiple plate assemblies in the main plate 12.

[0055] like Figure 6 , which is a schematic structural diagram of the main pole plate 12 of this embodiment, a plurality of pole plate assemblies are arranged on the same plane and perpendicular to the reciprocating direction of the core shaft 21 , and are arranged on the inner side wall of the base 11 .

[0056] In this embodiment, by setting a structure of multiple plate assemblies in the main plate 12, when the space inside the key is determined, as many plate assemblies as possible can be set, and the space occupied by each plate assembly in the arrangement direction is as small as possible. In the case of twisting of the conductor plate 22, the twisting between the conductor plate 22 and each plate assembly will be greatly reduced relative to the overall twisting, thereby further eliminating the capacitance deviation caused by the twisting of the conductor plate 22 and each plate assembly, thereby improving the accuracy of the overall capacitance detection and the accuracy of the position detection. It is worth mentioning that the more the number of plate assemblies, the closer the conductor plate 22 and each plate assembly are to a parallel state, the better the effect of eliminating the capacitance deviation caused by the twisting, and the higher the accuracy of the key displacement detection.

[0057] In one embodiment, in two adjacent electrode plate assemblies, the first electrode plate 121 of one electrode plate assembly is adjacent to and integrally arranged with the first electrode plate 121 of the other electrode plate assembly. Figure 6 As shown, two adjacent first electrode plates 121 are combined into one first electrode plate 121, thereby simplifying the manufacturing process of the key structure.

[0058] Specifically, if Figure 6As shown, the first electrode plates 121 and the second electrode plates 122 are arranged alternately to offset the effect of the twisting of the mandrel 21. The extension direction of the first gap L1 and the second gap L2 is a straight line. When there are multiple electrode assemblies, the multiple first gaps L1 and the multiple second gaps L2 are W-shaped. The W-shaped main pole plate 12 can further improve the compensation effect. In this embodiment, the extension direction of the first gap L1 and the second gap L2 is set to a straight line, and the W-shaped main pole plate 12 is set, so that when the conductor plate 22 moves along the reciprocating direction, the facing area of ​​the conductor plate 22 and the first pole plate 121, and the facing area of ​​the conductor plate 22 and the second pole plate 122 tend to change linearly, and the setting of multiple plate assemblies offsets the influence of torsion on capacitance. The change of the relationship (C1-C2) / (C1+C2) is as much as possible related to the change of the facing area, so that the relationship (C1-C2) / (C1+C2) tends to change linearly with the change of the facing area, thereby further improving the accuracy of capacitance detection and further improving the accuracy of key displacement detection.

[0059] In one embodiment, Figure 7 As shown in FIG. 1 , it is a schematic diagram of the structure of the motion component 2 in the capacitive induction key of the present embodiment, wherein the number of the conductor plates 22 is two, and the two conductor plates 22 are respectively arranged on different outer side walls of the core shaft 21; the two conductor plates 22 are connected by a wire 24. Figure 8 As shown, it is a schematic diagram of the structure of the base 1 in the capacitive sensing button of this embodiment. The main pole plate 12 and the secondary pole plate 13 are located on different inner side walls of the base 11. The main pole plate 12 is arranged opposite to a conductor plate 22, and the secondary pole plate 13 is arranged opposite to another conductor plate 22.

[0060] Specifically, the two conductor plates 22 are respectively disposed on two opposite outer side walls of the core shaft 21 , and the main pole plate 12 and the secondary pole plate 13 are respectively disposed on different opposite inner side walls of the base 11 .

[0061] In this embodiment, two conductor plates 22 connected by a wire 24 are arranged, the main pole plate 12 is arranged opposite to one conductor plate 22, and the secondary pole plate 13 is arranged opposite to the other conductor plate 22. The actual distance between the main pole plate 12 and the secondary pole plate 13 is changed by utilizing the jump bridging characteristics of the two conductor plates 22 for the capacitive signal, so that the design of the pole plate in the key can be more flexible, and the space limitation of the pole plate can be eliminated. The main pole plate 12 and the secondary pole plate 13 can be arranged in the idle area of ​​the key, thereby improving the flexibility of the key setting, ensuring that the size of the key is small, and facilitating further reduction of the key size.

[0062] In one embodiment, the conductor plate 22 is located on the outer side wall of the core shaft 21, and the main electrode plate 12 and the secondary electrode plate 13 are located on the same inner side wall of the base 11. Fig. 9, which is a schematic diagram of the exploded structure of the capacitive induction button of this embodiment, the conductor plate 22 is arranged on the outer wall of the core shaft 21, and the main pole plate 12 and the secondary pole plate 13 are located on the same inner wall of the base 11.

[0063] In this embodiment, the conductor plate 22 is arranged on the outer wall of the core shaft 21, and the main pole plate 12 and the secondary pole plate 13 are located on the same inner wall of the base 11 as the other conductor plate 22. The actual distance between the main pole plate 12 and the secondary pole plate 13 is changed by utilizing the characteristic of the conductor plate 22 for jumping bridge of the capacitive signal. This can make the design of the pole plate in the key more flexible and get rid of the space limitation of the pole plate. The main pole plate 12 and the secondary pole plate 13 can be arranged in the vacant area of ​​the key, thereby improving the flexibility of the key setting, ensuring that the size of the key is small, and facilitating further reduction of the key size.

[0064] Specifically, the capacitive induction key of this embodiment further includes a shaft seat 3; the shaft seat 3 includes a first interface, a second interface, and a third interface, such as Fig.10 As shown, in this embodiment Figure 1 The corresponding structural diagram of the capacitive induction button center axis seat 3 is as follows: Fig.11 As shown, in this embodiment Figure 1 The corresponding structural diagram of the capacitive induction button center axis seat 3 packaging SMT patch is as follows Fig.12 As shown, in this embodiment Fig. 9 The corresponding structural diagram of the capacitive induction button center axis seat 3 is as follows: Fig.13 As shown, in this embodiment Fig. 9 The corresponding structural diagram of the capacitive sensing button center axis seat 3 packaging SMT patch.

[0065] Specifically, the shaft seat 3 includes a first interface Rx1, a second interface Rx2, and a third interface Tx. The secondary pole plate 13 and the first pole plate 121 and the second pole plate 122 in the main pole plate 12 are fixed to the base 11 by glue or snaps, and the pin positions at the bottom of the secondary pole plate 13, the first pole plate 121, and the second pole plate 122 extend out of the base 11 to facilitate subsequent connection with the shaft seat 3; wherein, multiple first pole plates 121 share a first pin pin1, multiple second pole plates 122 share a second pin pin2, and the secondary pole plate 13 has a third pin pin3. Therefore, the main pole plate 12 includes a first pin pin1 and a second pin pin2, and the secondary pole plate 13 includes a third pin pin3.

[0066] like Figure 1 , Fig. 9It can be seen from the two capacitive sensing buttons shown that the main pole plate 12 includes a first pin pin1 and a second pin pin2, the secondary pole plate 13 includes a third pin pin3, the first interface Rx1 is connected to the first pin pin1, and the first pin pin1 is connected to each first pole plate 121 in the main pole plate 12; the second interface Rx2 is connected to the second pin pin2, and the second pin pin2 is connected to each second pole plate 122 in the main pole plate 12; the third interface Tx is connected to the third pin pin3.

[0067] Specifically, the back side of the main pole plate 12 is paved with the ground, that is, the side of the main pole plate 12 away from the conductor plate 22 is paved with the ground, which plays a role in shielding interference signals. Therefore, the main pole plate 12 also includes a ground pin GND, and the corresponding shaft seat 3 also includes a ground port GND1. The ground pin GND of the main pole plate 12 is connected to the ground port GND1 on the shaft seat 3. The shaft seat 3 is provided with a plurality of surface mount technology (SMT, Surface Mount Technology) patches, which are respectively connected to the first interface Rx1, the second interface Rx2, the third interface Tx, and the ground port GND1, wherein the patch SMT1 is connected to the first interface Rx1, the patch SMT2 is connected to the second interface Rx2, the patch SMT3 is connected to the third interface Tx, and the patch SMT4 is connected to the ground port GND1.

[0068] Specifically, the positions of the multiple interfaces on the shaft seat 3 are set corresponding to the pin positions of the main pole plate 12 and the secondary pole plate 13. In practice, the multiple interfaces on the shaft seat 3 can be set according to the pin positions of the main pole plate 12 and the secondary pole plate 13, such as: Figure 1 and Fig.10 , Fig.11 The corresponding interface of shaft seat 3 and SMT patch correspondence, Fig. 9 and Fig.12 , Fig.13 The corresponding interfaces of the shaft seat 3 and the SMT patches correspond to each other, so that the pins of the main pole plate 12 and the secondary pole plate 13 pass through the base 11 and are directly connected to the corresponding interfaces on the shaft seat 3, thereby reducing the pin length as much as possible and reducing the size of the button.

[0069] Specifically, the shaft seat 3 is fixed to the main circuit board through the SMT technology. After the conductive pins at the lower ends of the main pole plate 12 and the secondary pole plate 13 are inserted into the shaft seat 3, they are connected to the main circuit board to form a capacitor loop through the contact between the pins, so as to detect the changes of the first capacitor and the second capacitor, thereby realizing the detection of the key displacement. This solution is simple and reliable, low cost, and can realize the hot plug function.

[0070] On the other hand, an embodiment of the present application further provides an electronic device, including: a housing and a plurality of the above-mentioned capacitive sensing buttons arranged in the housing.

[0071] Compared with the related art, the electronic device provided by this embodiment of the present invention is provided with the capacitive sensing button provided by the aforementioned embodiment. Therefore, it also has the technical effects provided by the aforementioned embodiment, which will not be elaborated here.

[0072] The division of various components above is only for clear description. When implemented, they can be combined into one component or some components can be split and decomposed into multiple components. As long as they include the same logical relationship, they are all within the protection scope of this embodiment.

[0073] Another embodiment of the present invention relates to a key detection method, which is applied to the above-mentioned capacitive sensing key, and the method includes: detecting capacitance signals generated by a first capacitor and a second capacitor; and determining the movement distance of the key according to changes in the capacitance signals.

[0074] The moving distance of the key is determined according to the change of the capacitance signal, which is described in detail in the above embodiment and will not be repeated here.

[0075] The step division of the various methods above is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the protection scope of the present invention. Adding insignificant modifications or introducing insignificant designs to the algorithm or process without changing the core design of the algorithm and process are all within the protection scope of the invention.

[0076] Another embodiment of the present invention relates to a computer-readable storage medium storing a computer program, which implements the above method embodiment when executed by a processor.

[0077] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0078] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A capacitive sensing button, characterized in that: include: Base and motion components; The moving component passes through the top surface of the base, and the moving component reciprocates perpendicular to the top surface; The moving assembly includes a core shaft and a conductor plate fixed relative to the core shaft; The base includes a base, a main pole plate and a secondary pole plate fixed relative to the base; the conductor plate is respectively arranged relative to the main pole plate and the secondary pole plate; The main electrode plate includes an electrode plate assembly, the electrode plate assembly includes two first electrode plates and one second electrode plate, the two first electrode plates are symmetrically arranged on both sides of the second electrode plate; a first gap exists between one of the first electrode plates and the second electrode plate, and a second gap exists between the other first electrode plate and the second electrode plate, and the extension direction of the first gap and the second gap is different from the reciprocating motion direction; Among them, the two first plates, the conductor plate and the secondary plate together form a first capacitor, and the second plate, the conductor plate and the secondary plate together form a second capacitor; when the core shaft reciprocates, the capacitance signals of the first capacitor and the second capacitor change.

2. The capacitive induction button according to claim 1, characterized in that: The main pole plate includes a plurality of pole plate assemblies; the plurality of pole plate assemblies are arranged on the inner side wall of the base, and the plurality of pole plate assemblies are arranged perpendicular to the reciprocating motion direction.

3. The capacitive induction button according to claim 2, characterized in that: In two adjacent electrode plate assemblies, the first electrode plate of one electrode plate assembly is adjacent to and integrally arranged with the first electrode plate of the other electrode plate assembly.

4. The capacitive induction button according to claim 1, characterized in that: In one of the plate assemblies, the lengths of the first gap and the second gap in the reciprocating direction are equal to the length of the plate assembly in the reciprocating direction; the lengths of the first gap and the second gap in the target direction are equal to half of the width of the plate assembly in the target direction; The target direction is a direction perpendicular to the reciprocating motion direction and parallel to a surface of the main pole plate close to the conductor plate.

5. The capacitive induction button according to claim 1, characterized in that: The conductor plate is located on the outer side wall of the core shaft, and the main pole plate and the auxiliary pole plate are located on the same inner side wall of the base.

6. The capacitive induction button according to claim 1, characterized in that: There are two conductor plates, which are respectively arranged on different outer side walls of the core shaft; the two conductor plates are connected by a wire; The main pole plate and the auxiliary pole plate are located on different inner side walls of the base. The main pole plate is arranged opposite to one of the conductor plates, and the auxiliary pole plate is arranged opposite to the other conductor plate.

7. The capacitive induction button according to claim 1, characterized in that: The capacitive sensing button also includes a shaft seat; the shaft seat includes a first interface, a second interface, and a third interface, the main pole plate includes a first pin and a second pin, and the secondary pole plate includes a third pin; the first interface is connected to the first pin, and the first pin is connected to each of the first pole plates in the main pole plate; the second interface is connected to the second pin, and the second pin is connected to each of the second pole plates in the main pole plate; the third interface is connected to the third pin.

8. An electronic device, characterized in that: The invention comprises: a shell and a plurality of capacitive induction buttons as claimed in any one of claims 1 to 7 arranged in the shell.

9. A key detection method, characterized in that: Applied to the capacitive sensing button according to any one of claims 1 to 7, the method comprising: Detecting capacitance signals generated by the first capacitor and the second capacitor; The moving distance of the key is determined according to the change of the capacitance signal.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the key detection method according to claim 9 is implemented.

Images