Capacitive sensing key, device, method and storage medium

Abstract

The present application relates to the technical field of keys, and discloses a capacitive sensing key, a device, a method, and a storage medium. The capacitive sensing key of the present application comprises a base (1) and a moving assembly (2); the moving assembly (2) passes through the top surface of the base (1), and comprises a stem (21) and conductor plates (22); the base (1) comprises a seat (11), a main electrode plate (12) and an auxiliary electrode plate (13); the conductor plates (22) are respectively arranged opposite to the main electrode plate (12) and the auxiliary electrode plate (13); the main electrode plate (12) comprises an electrode plate assembly (120); the electrode plate assembly (120) comprises two first electrode plates (121) and a second electrode plate (122); a first gap (L1) is formed between one first electrode plate (121) and the second electrode plate (122), and a second gap (L2) is formed between the other first electrode plate (121) and the second electrode plate (122); and the extension direction of the first gap (L1) and the extension direction of the second gap (L2) are different from a reciprocating direction.

Description

Capacitive sensing key, device, method and storage medium Cross-reference to related applications

[0001] The present application is based on the Chinese patent application No. 2024112310426, filed on September 3, 2024, and claims priority to the above-mentioned Chinese patent application, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of keys, in particular to a capacitive sensing key, device, method and storage medium. BACKGROUND

[0003] At present, electronic devices of key type are widely used in production and life, such as keyboard, computer and the like. Taking keyboard keys as an example, conventional keyboard keys can only detect two states of on-off. There is a kind of magnetic shaft key in the market at present, which can detect the displacement of pressing by detecting the strength of the magnetic field received by the chip when the key is pressed, so as to realize the measurement of the intermediate process.

[0004] However, the current magnetic shaft key has the problems of uneven sensitivity and being easily disturbed by external magnetic interference, resulting in low accuracy of detecting the displacement of the key. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a capacitive sensing key, device, method and storage medium, so as to improve the accuracy of detecting the displacement of the key.

[0006] To solve the above technical problems, the embodiments of the present application provide a capacitive sensing key, comprising: a base and a moving component; the moving component penetrates through the top surface of the base, and the moving component reciprocates vertically to the top surface; the moving component comprises a core shaft and a conductor plate fixed opposite to the position of the core shaft; the base comprises a base, a main pole plate and a secondary pole plate fixed opposite to the position of the base; the conductor plate is arranged opposite to the main pole plate and the secondary pole plate respectively; the main pole plate comprises a pole plate component, the pole plate component comprises two first pole plates, a second pole plate, and the two first pole plates are symmetrically arranged on both sides of the second pole plate; one of the first pole plates has a first gap with the second pole plate, and the other of the first pole plates has a second gap with the second pole plate, the extension directions of the first gap and the second gap are different from the reciprocating 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; under the condition that the core shaft reciprocates, the capacitance signals of the first capacitor and the second capacitor change.

[0007] The embodiment of the present application further provides an electronic device, comprising a shell and a plurality of capacitive sensing keys arranged in the shell.

[0008] The embodiment of the present application further provides a key detection method, comprising: detecting a capacitive signal generated by the first capacitor and the second capacitor; determining a moving distance of the key according to a change of the capacitive signal.

[0009] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the key detection method.

[0010] In some embodiments, the main electrode plate comprises a plurality of electrode plate assemblies; the plurality of electrode plate assemblies are arranged on the inner side wall of the base, and the plurality of electrode plate assemblies are arranged along a direction perpendicular to the reciprocating direction.

[0011] 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.

[0012] In some embodiments, in one electrode plate assembly, lengths of the first gap and the second gap in the reciprocating direction are equal to a length of the electrode plate assembly in the reciprocating direction; lengths of the first gap and the second gap in a target direction are equal to half of a width of the electrode plate assembly in the target direction; the target direction is a direction perpendicular to the reciprocating direction and parallel to a surface of the main electrode plate close to the conductor plate.

[0013] In some embodiments, the conductor plate is located on the outer side wall of the mandrel, and the main electrode plate and the auxiliary electrode plate are located on the same inner side wall of the base.

[0014] In some embodiments, the number of conductor plates is two, and the two conductor plates are arranged on different outer side walls of the mandrel respectively; the two conductor plates are connected by wires; the main electrode plate and the auxiliary electrode plate are located on different inner side walls of the base, the main electrode plate is arranged opposite to one conductor plate, and the auxiliary electrode plate is arranged opposite to the other conductor plate.

[0015] In some embodiments, the capacitive sensing button further comprises a shaft seat; the shaft seat comprises a first interface, a second interface and a third interface; the main electrode plate comprises a first pin and a second pin; the auxiliary electrode plate comprises a third pin; the first interface is connected to the first pin, and the first pin is connected to each of the first electrode plates in the main electrode plate; the second interface is connected to the second pin, and the second pin is connected to each of the second electrode plates in the main electrode plate; and the third interface is connected to the third pin.

[0016] The technical scheme provided by the embodiments of the present application has at least the following advantages:

[0017] In the capacitive sensing button, the conductor plate, the main electrode plate and the auxiliary electrode plate are arranged, the conductor plate is arranged opposite to the main electrode plate and the auxiliary electrode plate, the conductor plate is fixed opposite to the shaft, the main electrode plate and the auxiliary electrode plate are fixed opposite to the base; when the button is pressed or popped up, the shaft drives the conductor plate to reciprocate, the relative areas of the conductor plate and the first electrode plate of the main electrode plate, the relative areas of the conductor plate and the second electrode plate of the main electrode plate, and the relative areas of the conductor plate and the auxiliary electrode plate change, so that the capacitance signals of the first capacitor and the second capacitor change, and the moving distance of the button can be determined according to the change of the capacitance signals of the first capacitor and the second capacitor, and the position of the button can be determined, thereby improving the accuracy of the displacement detection of the button. In the button, the conductor plate, the main electrode plate and the auxiliary electrode plate are arranged, when the button is pressed or popped up to cause the conductor plate to twist, the influence of the twisting of the conductor plate on the capacitances of the two first electrode plates can be offset, the change of the first capacitor is reduced, the influence of the twisting of the conductor plate on the capacitance of the second electrode plate can also be offset, the change of the second capacitor is reduced, thereby offsetting the capacitance deviation caused by the twisting of the conductor plate, improving the accuracy of the capacitance detection, and further improving the accuracy of the position detection of the button. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example in the figures that are part of this disclosure and which are illustrative, but not limiting of the embodiments, with like references referring to like elements throughout the figures, unless otherwise noted. The figures are not necessarily to scale, the emphasis instead being placed upon illustrating the principles of the embodiments.

[0019] Fig. 1 is an exploded structural schematic diagram of a capacitive sensing button according to an embodiment of the present application;

[0020] Fig. 2 is a structural schematic diagram of a capacitive sensing button according to an embodiment of the present application;

[0021] Fig. 3 is a sectional structural schematic diagram of a capacitive sensing button according to an embodiment of the present application;

[0022] FIG. 4 is a structural schematic diagram of a plate assembly of a main plate in a capacitive sensing key according to an embodiment of the present application;

[0023] FIG. 5 is a structural schematic diagram of a capacitive structure when twisted according to an embodiment of the present application;

[0024] FIG. 6 is a structural schematic diagram of a main plate according to an embodiment of the present application;

[0025] FIG. 7 is a structural schematic diagram of a motion assembly in a capacitive sensing key according to an embodiment of the present application;

[0026] FIG. 8 is a structural schematic diagram of a base in a capacitive sensing key according to an embodiment of the present application;

[0027] FIG. 9 is an exploded structural schematic diagram of a capacitive sensing key according to an embodiment of the present application;

[0028] FIG. 10 is a structural schematic diagram of a shaft seat in a capacitive sensing key corresponding to FIG. 1 according to an embodiment of the present application;

[0029] FIG. 11 is a structural schematic diagram of a shaft seat encapsulating an SMT patch in a capacitive sensing key corresponding to FIG. 1 according to an embodiment of the present application;

[0030] FIG. 12 is a structural schematic diagram of a shaft seat in a capacitive sensing key corresponding to FIG. 9 according to an embodiment of the present application;

[0031] FIG. 13 is a structural schematic diagram of a shaft seat encapsulating an SMT patch in a capacitive sensing key corresponding to FIG. 9 according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] To solve the problem of uneven sensitivity, susceptibility to external magnetic interference, and low detection accuracy of the displacement of the key in the related art, an embodiment of the present application relates to a capacitive sensing key, which comprises a base and a motion assembly. The motion assembly penetrates the top surface of the base and reciprocates vertically to the top surface. The motion assembly 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 opposite to the main plate and the secondary plate, respectively. The main plate comprises a plate assembly, which comprises two first plates, a second plate, and the two first plates are symmetrically arranged on both sides of the second plate. One first plate and the second plate have a first gap, and the other first plate and the second plate have a second gap. The extension directions of the first gap and the second gap are different from the reciprocating direction. The first plate, the conductor plate, and the secondary plate jointly form a first capacitor, and the second plate, the conductor plate, and the secondary plate jointly form a second capacitor. In the case of reciprocating motion of the core shaft, the capacitance signals of the first capacitor and the second capacitor change.

[0033] The embodiment sets the conductor plate, the main pole plate and the auxiliary pole plate in the capacitive sensing type key, the conductor plate is arranged opposite to the main pole plate and the auxiliary pole plate respectively, the conductor plate is fixed opposite to the mandrel, the main pole plate and the auxiliary pole plate are fixed opposite to the base; when the key is pressed or popped up, the conductor plate is driven by the mandrel to reciprocate, 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, the relative area of the conductor plate and the auxiliary pole plate change, so that the capacitance signal of the first capacitor and the second capacitor changes, the moving distance of the key can be judged according to the change of the first capacitor and the second capacitor, the position of the key is determined, and the accuracy of the key displacement detection is improved.

[0034] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation modes of the present application, and the embodiments can be combined and referenced with each other on the premise of no contradiction.

[0035] As shown in FIG. 1, it is an exploded structure schematic diagram of the capacitive sensing type key of the embodiment, as shown in FIG. 2, it is a structure schematic diagram of the capacitive sensing type key of the embodiment, as shown in FIG. 3, it is a cross-sectional structure schematic diagram of the capacitive sensing type key of the embodiment, as shown in FIG. 4, it is a structure schematic diagram of the pole plate assembly of the main pole plate in the capacitive sensing type key of the embodiment, the capacitive sensing type key of the embodiment comprises: the base 1, the movement assembly 2.

[0036] In some embodiments, the motion assembly 2 penetrates the top surface of the base 1, and the motion assembly 2 reciprocates vertically to the top surface; the motion assembly 2 includes a mandrel 21 and a conductor plate 22 fixed opposite to the position of the mandrel 21, and the base 1 includes a base 11, a main plate 12 and a secondary plate 13 fixed opposite to the position of the base 11; the conductor plate 22 is arranged opposite to the main plate 12 and the secondary plate 13 respectively; the main plate 12 includes a plate assembly 120, and the plate assembly 120 includes two first plates 121 and a second plate 122, and the two first plates 121 are symmetrically arranged on both sides of the second plate 122; one of the first plates 121 and the second plate 122 has a first gap L1, and the other of the first plates 121 and the second plate 122 has a second gap L2, and the extension directions of the first gap L1 and the second gap L2 are different from the reciprocating direction; wherein the first plate 121, the conductor plate 22 and the secondary plate 13 together form a first capacitor, and the second plate 122, the conductor plate 22 and the secondary plate 13 together form a second capacitor; under the reciprocating motion of the mandrel 21, the capacitance signals of the first capacitor and the second capacitor change.

[0037] In some embodiments, the capacitive sensing button further includes a shaft seat 3, the main plate 12 includes a first pin pin1, a second pin pin2 and a ground pin GND, the secondary plate 13 includes a third pin pin3, the first pin pin1, the second pin pin2, the third pin pin3 and the ground pin GND penetrate the bottom of the base 11 and are connected to the corresponding interfaces on the shaft seat 3; the motion assembly 2 further includes a cover plate 23, and the cover plate 23 includes a hollow area, the cover plate 23 covers the mandrel 21, and the top surface of the mandrel 21 is exposed to the surface of the cover plate 23 through the hollow area.

[0038] In some embodiments, the conductor plate 22 is generally a conductive metal, the conductor plate 22 is fixed on the mandrel 21 to form a complete structure and reciprocates up and down with the mandrel 21; the secondary plate 13 can be manufactured by metal stamping; the main plate 12 can be manufactured by using a PCB (Printed Circuit Board), or by using an FPC (Flexible Printed Circuit) or a metal sheet.

[0039] The key structure in the embodiment is provided, when the key is pressed or popped up, the core shaft 21 drives the conductor plate 22 to reciprocate, the relative areas of the conductor plate 22 and the first pole plate 121 of the main pole plate 12, the relative areas of the conductor plate 22 and the second pole plate 122 of the main pole plate 12, and the relative areas of the conductor plate 22 and the auxiliary pole plate 13 change, so that the capacitance signals of the first capacitor and the second capacitor change, the moving distance of the key can be judged according to the change of the first capacitor and the second capacitor, the position of the key is determined, the detection of the whole process in the pressing process of the key is realized, the accuracy of the displacement detection of the key is improved, compared with the magnetic shaft scheme, the embodiment has the advantages of good linearity, strong anti-interference ability, low power consumption and the like. And on the basis of accurately determining the displacement of the core shaft 21, any trigger stroke, trigger time and the like can be set on the key, different tactile experiences are brought to users, and multi-stage triggering is designed on a single key, and the tactile experience of a single key is enriched.

[0040] The key structure in the embodiment is provided, when the key is pressed or popped up, the core shaft 21 drives the conductor plate 22 to reciprocate, the relative areas of the conductor plate 22 and the first pole plate 121 of the main pole plate 12, the relative areas of the conductor plate 22 and the second pole plate 122 of the main pole plate 12, and the relative areas of the conductor plate 22 and the auxiliary pole plate 13 change, so that the capacitance signals of the first capacitor and the second capacitor change, the moving distance of the key can be judged according to the change of the first capacitor and the second capacitor, the position of the key is determined, the detection of the whole process in the pressing process of the key is realized, the accuracy of the displacement detection of the key is improved, compared with the magnetic shaft scheme, the embodiment has the advantages of good linearity, strong anti-interference ability, low power consumption and the like. And on the basis of accurately determining the displacement of the core shaft 21, any trigger stroke, trigger time and the like can be set on the key, different tactile experiences are brought to users, and multi-stage triggering is designed on a single key, and the tactile experience of a single key is enriched.

[0041] The key structure in the embodiment is provided, when the key is pressed or popped up, the core shaft 21 drives the conductor plate 22 to reciprocate, the relative areas of the conductor plate 22 and the first pole plate 121 of the main pole plate 12, the relative areas of the conductor plate 22 and the second pole plate 122 of the main pole plate 12, and the relative areas of the conductor plate 22 and the auxiliary pole plate 13 change, so that the capacitance signals of the first capacitor and the second capacitor change, the moving distance of the key can be judged according to the change of the first capacitor and the second capacitor, the position of the key is determined, the detection of the whole process in the pressing process of the key is realized, the accuracy of the displacement detection of the key is improved, compared with the magnetic shaft scheme, the embodiment has the advantages of good linearity, strong anti-interference ability, low power consumption and the like. And on the basis of accurately determining the displacement of the core shaft 21, any trigger stroke, trigger time and the like can be set on the key, different tactile experiences are brought to users, and multi-stage triggering is designed on a single key, and the tactile experience of a single key is enriched.

[0042] In some embodiments, the main pole plate 12 includes a pole plate assembly 120, the pole plate assembly 120 includes two first pole plates 121 and a second pole plate 122; the first pole plate 121 and the second pole plate 122 are arranged perpendicularly to the reciprocating direction on the same plane, and the two first pole plates 121 are symmetrically arranged on both sides of the second pole plate 122; the auxiliary pole plate 13 is arranged opposite to the main pole plate 12. It should be noted that the main pole plate 12 can include one pole plate assembly 120 as shown in FIG. 4, or a plurality of pole plate assemblies 120 arranged as shown in FIG. 4.

[0043] In some embodiments, in order to make the capacitance signals of the first and second capacitors change when the mandrel 21 reciprocates, the length of the first electrode plate 121 in the reciprocating direction and the length of the second electrode plate 122 in the reciprocating direction are both greater than the stroke amount of the conductor plate 22 in the reciprocating direction; thus, it is ensured that the relative areas of the conductor plate 22 and the first and second electrode plates 121 and the relative area of the conductor plate 22 and the auxiliary electrode plate 13 change when the mandrel 21 reciprocates, so that the capacitance signals of the first and second capacitors change, and the moving distance of the key can be determined according to the change of the first and second capacitors, the position of the key is determined, and the accuracy of the key displacement detection is improved.

[0044] Specifically, one first electrode plate 121 and one second electrode plate 122 have a first gap L1, and the other first electrode plate 121 and the second electrode plate 122 have a second gap L2, and the extension directions of the first gap L1 and the second gap L2 are different from the reciprocating direction.

[0045] In some embodiments, the two first electrode plates 121 are the same in size and shape, and are symmetrically arranged on both sides of the second electrode plate 122 along the central axis of the second electrode plate 122, so that the shape and size of the first gap L1 between one first electrode plate 121 and the second electrode plate 122 and the second gap L2 between the other first electrode plate 121 and the second electrode plate 122 are the same, and the first gap L1 and the second gap L2 are symmetrically arranged along the central axis of the second electrode plate 122, and the direction of the central axis of the second electrode plate 122 is the same as the reciprocating direction of the mandrel 21.

[0046] Specifically, the extension directions of the first gap L1 and the second gap L2 are different from the reciprocating direction of the mandrel 21, that is, the first gap L1 has an included angle with the reciprocating direction of the mandrel 21, and the second gap L2 also has a symmetrical included angle with the reciprocating direction of the mandrel 21; when the conductor plate 22 reciprocates with the mandrel 21, the first and second capacitors change, and the displacement of the conductor plate 22 can be determined according to the change of the first and second capacitors, so as to determine the displacement of the key.

[0047] As shown in FIG. 5, it is a structural schematic diagram of the capacitor structure of the embodiment when it is twisted. The dashed line is the central axis of the second electrode plate 122, and the conductor plate 22 rotates around the dashed line. When the conductor plate 22 is twisted during the movement of the mandrel 21, the distance between A and the first electrode plate 121 is large, and the distance between D and the other first electrode plate 121 is small. The distances between the points A, B, C, D in the conductor plate 22 and the main electrode plate 12 are large, medium large, medium small, and small in turn. For the A and D points, their opposite positions are the first electrode plate 121, so the effects of the twist cancel each other out. Similarly, the effects of the twist at the B and C points also cancel each other out. It can be approximately considered that the equivalent distances between the two first electrode plates 121 and the conductor plate 22 and the equivalent distances between the second electrode plate 122 and the conductor plate 22 are equal to the equivalent distance between the O point on the central axis and the conductor plate 22, thereby compensating for the effects of the twist and improving the accuracy of the capacitor detection and the accuracy of the detection of the displacement of the key.

[0048] In some embodiments, in one electrode plate assembly 120, the two first electrode plates 121 and the second electrode plate 122 together form a cuboid; the lengths of the first gap L1 and the second gap L2 in the direction of the reciprocating movement of the mandrel 21 are equal to the length of the electrode plate assembly 120 in the direction of the reciprocating movement of the mandrel 21; the lengths of the first gap L1 and the second gap L2 in the target direction are equal to half the width of the electrode plate assembly 120 in the target direction; and the target direction is perpendicular to the direction of the reciprocating movement of the mandrel 21 and parallel to the surface of the main electrode plate 12 close to the conductor plate 22.

[0049] In one embodiment, in one electrode plate assembly 120, the extension directions of the first gap L1 and the second gap L2 are straight lines. As shown in FIG. 4, from bottom to top, the distance between the first gap L1 and the second gap L2 linearly increases, and the first gap L1 and the second gap L2 form a V shape. In some embodiments, the first gap L1 extends straight from the midpoint of the bottom edge of the cuboid to the left top corner of the cuboid, and the second gap L2 extends straight from the midpoint of the bottom edge of the cuboid to the right top corner of the cuboid. In this embodiment, by setting the extension directions of the first gap L1 and the second gap L2 as straight lines, when the conductor plate 22 moves in the reciprocating direction of the mandrel 21, the change of the opposite area of the conductor plate 22 and the first electrode plate 121 and the second electrode plate 122 shows a linear change trend. The change of the relationship (C1-C2) / (C1+C2) is only related to the change of the opposite area. By the relationship (C1-C2) / (C1+C2), not only the effects of the electrode plate spacing can be offset, but also the change of the relationship (C1-C2) / (C1+C2) shows a linear change trend with the change of the opposite area, thereby further improving the accuracy of the capacitor detection and the accuracy of the key position detection.

[0050] In other embodiments, the first gap L1 and the second gap L2 can extend in a curve, and the distance between the first gap L1 and the second gap L2 can gradually increase from bottom to top, for example, the first gap L1 and the second gap L2 can form a U shape.

[0051] In the case where the conductor plate 22 does not twist, the distance between the conductor plate 22 opposite to the main electrode plate 12 and the first electrode plate 121 and the second electrode plate 122 is d, and the conductor plate 22 is opposite to the auxiliary electrode plate 13, which is equivalent to reducing the distance between the auxiliary electrode plate 13 and the main electrode plate 12. The position of the conductor plate 22 opposite to the main electrode plate 12 can be determined as the position of the auxiliary electrode plate 13 to determine the first capacitance and the second capacitance. According to the capacitance formula, the first capacitance C1 = 2εS1 / 4πkd and the second capacitance C2 = εS2 / 4πkd can be calculated, where ε is the dielectric constant of the medium, k is the electrostatic force constant, S1 is the opposite area of the first electrode plate 121 and the conductor plate 22, and S2 is the opposite area of the second electrode plate 122 and the conductor plate 22. Then, the relationship of (C1-C2) / (C1+C2) is calculated, (C1-C2) / (C1+C2) = (2S1-S2) / (2S1+S2).

[0052] In the case where the conductor plate 22 twists, as shown in FIG. 5, the distance between the conductor plate 22 and the second electrode plate 122 is d, the equivalent distance between the point A of the conductor plate 22 and one of the first electrode plates 121 is d+x, and the equivalent distance between the point D of the conductor plate 22 and the other of the first electrode plates 121 is d-x, where x is the twisting distance of the conductor plate 22. According to the capacitance formula, the first capacitance C1 = εS1 / 4πk(d-x)+εS1 / 4πk(d+x) and the second capacitance C2 = εS2 / 4πkd can be calculated, where ε is the dielectric constant of the medium, k is the electrostatic force constant, S1 is the opposite area of the first electrode plate 121 and the conductor plate 22, and S2 is the opposite area of the second electrode plate 122 and the conductor plate 22. Then, the relationship of (C1-C2) / (C1+C2) is calculated as follows: (C1-C2) / (C1+C2) = [εS1 / 4πk(d-x)+εS1 / 4πk(d+x)-εS2 / 4πkd] / (εS1 / 4πk(d-x)+εS1 / 4πk(d+x)+εS2 / 4πkd) = [2S1d 2 -S2(d 2 -x 2 )] / [2S1d 2 +S2(d 2 -x 2 )].

[0053] According to the (C1-C2) / (C1+C2) relationship, when the conductor plate 22 is twisted by a distance x much smaller than d, the (C1-C2) / (C1+C2) relationship is close to the case without twisting, and the effect of the twisting of the conductor plate 22 on the (C1-C2) / (C1+C2) relationship can be ignored. In the capacitor structure formed by the conductor plate 22, the main electrode plate 12, and the auxiliary electrode plate 13, the twisting distance x of the conductor plate 22 is generally much smaller than the value of d. Therefore, in the case of small-distance twisting of the conductor plate 22, the (C1-C2) / (C1+C2) relationship can still offset the effect of the electrode plate spacing, thereby improving the accuracy of the capacitance detection and further improving the accuracy of the position detection of the key.

[0054] To further solve the problem of poor capacitance detection accuracy caused by large torque, the embodiment provides a plurality of electrode plate assemblies 120 in the main electrode plate 12.

[0055] As shown in FIG. 6, the structure of the main electrode plate 12 of the embodiment is shown. The plurality of electrode plate assemblies 120 are arranged on the same plane and perpendicular to the reciprocating direction of the mandrel 21, and are arranged on the inner side wall of the base 11.

[0056] The embodiment provides a plurality of electrode plate assemblies 120 in the main electrode plate 12. In the case of a determined space inside the key, as many electrode plate assemblies 120 as possible are arranged, and the space occupied by each electrode plate assembly 120 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 electrode plate assembly 120 is significantly reduced relative to the overall twisting, thereby further eliminating the capacitance deviation caused by the twisting of the conductor plate 22 and each electrode plate assembly 120, thereby improving the accuracy of the overall capacitance detection and improving the accuracy of the position detection. It is worth mentioning that the more the number of electrode plate assemblies 120, the closer the conductor plate 22 and each electrode plate assembly 120 to the 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 the two adjacent electrode plate assemblies 120, the first electrode plate 121 of one electrode plate assembly 120 is adjacent to and integrally arranged with the first electrode plate 121 of the other electrode plate assembly 120. As shown in FIG. 6, the 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, as shown in FIG. 6, the first pole plate 121 and the second pole plate 122 are staggered, which can offset the effect of the torsion of the mandrel 21. The extension direction of the first gap L1 and the second gap L2 is a straight line, and in the case where the number of pole plate assemblies 120 is multiple, the multiple first gaps L1 and the multiple second gaps L2 are in a W shape. The W-shaped main pole plate 12 can further improve the compensation effect. In the embodiment, by setting the extension direction of the first gap L1 and the second gap L2 as a straight line and setting the W-shaped main pole plate 12, 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 change linearly, and the multiple pole plate assemblies 120 offset the effect of the torsion on the capacitance, the change of the relationship (C1-C2) / (C1+C2) is related to the facing area as much as possible, and the relationship (C1-C2) / (C1+C2) changes linearly with the facing area, thereby further improving the accuracy of capacitance detection and further improving the accuracy of key displacement detection.

[0059] In one embodiment, as shown in FIG. 7, which is a structural schematic diagram of the motion assembly 2 in the capacitive sensing key of the embodiment, the number of conductor plates 22 is two, and the two conductor plates 22 are respectively arranged on different outer side walls of the mandrel 21; the two conductor plates 22 are connected by the wire 24. As shown in FIG. 8, which is a structural schematic diagram of the base 1 in the capacitive sensing key of the embodiment, the main pole plate 12 and the auxiliary pole plate 13 are located on different inner side walls of the base 11, the main pole plate 12 is arranged opposite to one conductor plate 22, and the auxiliary pole plate 13 is arranged opposite to the other conductor plate 22.

[0060] In some embodiments, the two conductor plates 22 are respectively arranged on two opposite outer side walls of the mandrel 21, and the main pole plate 12 and the auxiliary pole plate 13 are respectively arranged on different opposite inner side walls of the base 11.

[0061] In the embodiment, by arranging the two conductor plates 22 connected by the wire 24, the main pole plate 12 is arranged opposite to one conductor plate 22, and the auxiliary pole plate 13 is arranged opposite to the other conductor plate 22, the actual distance between the main pole plate 12 and the auxiliary pole plate 13 is changed by using the jump bridging characteristic of the two conductor plates 22 to the capacitance signal, which can make the design of the pole plate in the key more flexible, get rid of the space limitation of the pole plate, and arrange the main pole plate 12 and the auxiliary pole plate 13 in the idle area of the key, improve the flexibility of key arrangement, ensure that the size of the key is small, and is conducive to further reducing the size of the key.

[0062] In one embodiment, the conductor plate 22 is arranged on the outer sidewall of the mandrel 21, and the main electrode plate 12 and the auxiliary electrode plate 13 are arranged on the same inner sidewall of the base 11. As shown in FIG. 9, which is an exploded structural schematic diagram of the capacitive sensing button of the embodiment, the conductor plate 22 is arranged on the outer sidewall of the mandrel 21, and the main electrode plate 12 and the auxiliary electrode plate 13 are arranged on the same inner sidewall of the base 11.

[0063] In the embodiment, the actual distance between the main electrode plate 12 and the auxiliary electrode plate 13 is changed by arranging the conductor plate 22 on the outer sidewall of the mandrel 21 and arranging the main electrode plate 12 and the auxiliary electrode plate 13 on the same inner sidewall of the base 11, and using the jump bridging characteristic of the conductor plate 22 to the capacitive signal. The design of the electrode plate in the button can be more flexible, and the space limitation of the electrode plate can be broken, the main electrode plate 12 and the auxiliary electrode plate 13 can be arranged in the idle area in the button, the flexibility of the button arrangement is improved, the size of the button is ensured to be small, and the button size is further reduced.

[0064] In some embodiments, the capacitive sensing button of the embodiment further includes a shaft seat 3. The shaft seat 3 includes a first interface, a second interface, and a third interface. As shown in FIG. 10, which is a structural schematic diagram of the shaft seat 3 in the capacitive sensing button corresponding to FIG. 1 in the embodiment, and as shown in FIG. 11, which is a structural schematic diagram of the shaft seat 3 encapsulating an SMT (Surface Mount Technology) patch in the capacitive sensing button corresponding to FIG. 1 in the embodiment, as shown in FIG. 12, which is a structural schematic diagram of the shaft seat 3 in the capacitive sensing button corresponding to FIG. 9 in the embodiment, and as shown in FIG. 13, which is a structural schematic diagram of the shaft seat 3 encapsulating an SMT patch in the capacitive sensing button corresponding to FIG. 9 in the embodiment.

[0065] Specifically, the shaft seat 3 includes a first interface Rx1, a second interface Rx2, and a third interface Tx. The auxiliary electrode plate 13 and the first electrode plate 121 and the second electrode plate 122 of the main electrode plate 12 are fixed to the base 11 by means of glue or buckles, and the bottom pin positions of the auxiliary electrode plate 13, the first electrode plate 121, and the second electrode plate 122 are extended out of the base 11, facilitating subsequent connection with the shaft seat 3. The plurality of first electrode plates 121 share one first pin pin1, the plurality of second electrode plates 122 share one second pin pin2, and the auxiliary electrode plate 13 has a third pin pin3. Therefore, the main electrode plate 12 includes the first pin pin1 and the second pin pin2, and the auxiliary electrode plate 13 includes the third pin pin3.

[0066] In some embodiments, as shown in FIG. 1 and FIG. 9, the main plate 12 of the capacitive sensing button can include a first pin pin1 and a second pin pin2, the auxiliary plate 13 can include a third pin pin3, a first interface Rx1 is connected to the first pin pin1, and the first pin pin1 is connected to each first plate 121 of the main plate 12; a second interface Rx2 is connected to the second pin pin2, and the second pin pin2 is connected to each second plate 122 of the main plate 12; and a third interface Tx is connected to the third pin pin3.

[0067] In some embodiments, the back of the main plate 12 is entirely paved, that is, the side of the main plate 12 away from the conductor plate 22 is entirely paved, which plays a role of shielding interference signals. Therefore, the main plate 12 further includes a ground pin GND, and the corresponding shaft seat 3 further includes a ground port GND1, and the ground pin GND of the main plate 12 is connected to the ground port GND1 of the shaft seat 3. The shaft seat 3 is provided with a plurality of SMT patches, which are respectively connected to the first interface Rx1, the second interface Rx2, the third interface Tx and the ground port GND1. Specifically, 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] In some embodiments, the positions of the plurality of interfaces on the shaft seat 3 correspond to the positions of the pins of the main plate 12 and the auxiliary plate 13. In practice, the plurality of interfaces on the shaft seat 3 can be arranged according to the positions of the pins of the main plate 12 and the auxiliary plate 13. For example, the interfaces and the SMT patches of the corresponding shaft seat 3 in FIG. 1, FIG. 10 and FIG. 11 correspond to each other, and the interfaces and the SMT patches of the corresponding shaft seat 3 in FIG. 9, FIG. 12 and FIG. 13 correspond to each other. In this way, after the pins of the main plate 12 and the auxiliary plate 13 penetrate the base 11, the pins can be directly connected to the corresponding interfaces on the shaft seat 3, so as to reduce the length of the pins and the size of the button as much as possible.

[0069] In some embodiments, the shaft seat 3 is fixed to the main circuit board by SMT technology. After the conductive pins at the lower ends of the main plate 12 and the auxiliary plate 13 are inserted into the shaft seat 3, the pins are connected to the main circuit board to form a capacitive loop, so as to detect the changes of the first capacitor and the second capacitor, thereby realizing the detection of the displacement of the button. This scheme is simple and reliable, has low cost, and can realize hot plug function.

[0070] In another aspect, the embodiments of the present application also provide an electronic device, which includes a shell and a plurality of capacitive sensing buttons arranged in the shell.

[0071] Compared with the related art, the electronic device provided in the embodiment of the present application is provided with the capacitive sensing type key provided in the foregoing embodiment, and therefore has the technical effects provided in the foregoing embodiment, which will not be described herein.

[0072] The division of the various components above is only for the purpose of clear description, and in actual implementation, one component can be combined or some components can be split into multiple components, as long as the same logical relationship is included, which is within the protection scope of the present embodiment.

[0073] Another aspect of the present application relates to a key detection method applied to the capacitive sensing type key, and the method comprises the following steps: detecting a capacitive signal generated by the first capacitor and the second capacitor; and determining a moving distance of the key according to a change of the capacitive signal.

[0074] The moving distance of the key is determined according to the change of the capacitive signal, which is specifically described in the foregoing embodiment and will not be described herein.

[0075] The division of the steps of the various methods above is only for the purpose of clear description, and in actual implementation, one step can be combined or some steps can be split into multiple steps, as long as the same logical relationship is included, which is within the protection scope of the present application; adding irrelevant modifications or introducing irrelevant designs in the algorithm or the flow, but not changing the core design of the algorithm and the flow, are within the protection scope of the present application.

[0076] Still another aspect of the present application relates to a computer readable storage medium storing a computer program. The computer program is executed by a processor to implement the method embodiment described above.

[0077] That is, those skilled in the art can understand that all or part of the steps of the method in the foregoing embodiments can be completed by a program instructing related hardware, the program is stored in a storage medium, and includes a plurality of instructions for causing a device (which can be a single-chip microcomputer, a 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 foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0078] Those skilled in the art can understand that the foregoing embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A capacitive inductive key, comprising: The base and the moving assembly; The moving assembly penetrates the top surface of the base and reciprocates perpendicularly to the top surface; The moving assembly comprises a mandrel and a conductor plate fixed opposite to the mandrel; The base comprises a base, a main electrode plate and a secondary electrode plate fixed opposite to the base; the conductor plate is arranged opposite to the main electrode plate and the secondary electrode plate respectively; The main electrode plate comprises an electrode plate assembly, which comprises two first electrode plates, a second electrode plate, and the two first electrode plates are symmetrically arranged on both sides of the second electrode plate; one of the first electrode plates has a first gap with the second electrode plate, and the other first electrode plate has a second gap with the second electrode plate; the extension directions of the first gap and the second gap are different from the reciprocating direction; The first electrode plate, the conductor plate and the secondary electrode plate together form a first capacitor, and the second electrode plate, the conductor plate and the secondary electrode plate together form a second capacitor; in the case of reciprocating movement of the mandrel, the capacitance signals of the first capacitor and the second capacitor change.

2. The capacitive sensing key of claim 1, wherein, The main electrode plate comprises a plurality of electrode plate assemblies; the plurality of electrode plate assemblies are arranged on the inner side wall of the base, and the plurality of electrode plate assemblies are arranged along a direction perpendicular to the reciprocating direction.

3. The capacitive sensing key of claim 2, wherein, In the 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 sensing key of claim 1, wherein, In one of the electrode plate assemblies, the lengths of the first gap and the second gap in the reciprocating direction are equal to the length of the electrode 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 electrode plate assembly in the target direction; The target direction is perpendicular to the reciprocating direction and parallel to the surface of the main electrode plate close to the conductor plate.

5. The capacitive sensing key of claim 1, wherein, The conductor plate is located on the outer side wall of the mandrel, and the main electrode plate and the secondary electrode plate are located on the same inner side wall of the base.

6. The capacitive sensing key of claim 1, wherein, The number of conductor plates is two, and the two conductor plates are arranged on different outer side walls of the mandrel respectively; the two conductor plates are connected by wires; The main electrode plate and the secondary electrode plate are located on different inner side walls of the base, the main electrode plate is arranged opposite to one of the conductor plates, and the secondary electrode plate is arranged opposite to the other conductor plate.

7. The capacitive sensing key of claim 1, wherein, The capacitive sensing key further comprises a shaft seat; the shaft seat comprises a first interface, a second interface and a third interface; the main electrode plate comprises a first pin and a second pin; the secondary electrode plate comprises a third pin; the first interface is connected to the first pin, and the first pin is connected to each of the first electrode plates in the main electrode plate; the second interface is connected to the second pin, and the second pin is connected to each of the second electrode plates in the main electrode plate; and the third interface is connected to the third pin.

8. An electronic device comprising: The shell and a plurality of capacitive sensing keys as claimed in any one of claims 1 to 7 arranged in the shell. 9.A key detection method applied to the capacitive sensing key according to any one of claims 1 to 7, the method comprising: detecting a capacitive signal generated by the first capacitor and the second capacitor; determining a moving distance of the key according to a change of the capacitive signal. 10.A computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the key detection method according to claim 9.

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