Piezoelectric button assembly and electronic device

Abstract

The present invention relates to the technical field of buttons, and provides a piezoelectric button assembly and an electronic device. The piezoelectric button assembly comprises a support frame provided with an accommodating space, a piezoelectric module accommodated and fixed in the accommodating space, a flexible circuit board passing through the support frame and extending into the accommodating space, a button covering the support frame and completely covering the accommodating space, an adapter seat fixed between the button and the piezoelectric module, and elastic members fixed between the button and the support frame. The piezoelectric module comprises a flat plate-like piezoelectric ceramic piece, and a first piezoelectric elastic piece and a second piezoelectric elastic piece which are respectively in an arch or cymbal shape. According to the piezoelectric button assembly of the present invention, the positional connection relationship among the support frame, the piezoelectric module, the flexible circuit board, the button, the adapter seat and the elastic members is specifically defined, thereby forming a feasible technical solution for the piezoelectric button assembly.

Description

Piezoelectric key components and electronic devices Technical Field

[0001] The present invention relates to the technical field of keys, and in particular to a piezoelectric key assembly and an electronic device. Background Art

[0002] The piezoelectric effect refers to an effect in which a medium undergoes shape changes such as compression or elongation when subjected to mechanical pressure, which in turn causes the surface of the medium to become charged.

[0003] A piezoelectric button refers to a button structure that uses the piezoelectric effect to achieve button control. Compared with a mechanical button structure, it has higher sensitivity and is more suitable for high-performance electronic devices.

[0004] Although the relevant technology proposes that the main structure of the piezoelectric button is a piezoelectric module, an adapter, a circuit board and a button, there is no feasible technical solution in reality. That is, the relevant technology only proposes the theory of piezoelectric buttons, and there is no feasible technical solution.

[0005] Therefore, it is necessary to provide a specific technical solution for a piezoelectric key assembly. Technical issues

[0006] The purpose of the present invention is to provide a piezoelectric key assembly and an electronic device to solve the problem that there is no feasible technical solution for piezoelectric keys in the related art. Technical Solutions

[0007] In a first aspect, the present invention provides a piezoelectric key assembly, comprising a support frame having a receiving groove, a piezoelectric module received and fixed in the receiving groove, a flexible circuit board penetrating the support frame and extending into the receiving groove, a key covering the support frame and completely covering the receiving groove, an adapter fixed between the key and the piezoelectric module, and an elastic member fixed between the key and the support frame;

[0008] The piezoelectric module includes a flat piezoelectric ceramic sheet and a first piezoelectric spring and a second piezoelectric spring respectively in a bow-shaped or cymbal-shaped shape; the first piezoelectric spring and the second piezoelectric spring are respectively located on opposite sides of the piezoelectric ceramic sheet, the two ends of the first piezoelectric spring are respectively fixed to the two ends of the piezoelectric ceramic sheet, and the middle area of ​​the first piezoelectric spring is fixed to the side of the support frame close to the button; the two ends of the second piezoelectric spring are respectively fixed to the two ends of the piezoelectric ceramic sheet, and the middle area of ​​the second piezoelectric spring is fixed to the side of the adapter away from the button and forms an electrical connection with the adapter; the flexible circuit board abuts against the piezoelectric ceramic sheet and forms an electrical connection with the piezoelectric ceramic sheet.

[0009] Preferably, the support frame includes a base plate and a first protrusion and a second protrusion formed by protruding from one side of the base plate and spaced apart from each other; the base plate, the first protrusion and the second protrusion are arranged to form the receiving groove; the elastic members include two, one of which is clamped and fixed between the button and the first protrusion, and the other is clamped and fixed between the button and the second protrusion.

[0010] Preferably, the support frame also includes a first limiting column protruding from one side of the base plate close to the button; the first piezoelectric spring is provided with a first limiting hole passing through it at a position corresponding to the first limiting column; the first limiting column is inserted into the first limiting hole.

[0011] Preferably, the elastic member is foam.

[0012] Preferably, the flexible circuit board passes through the bottom plate and is fixed to the piezoelectric ceramic sheet.

[0013] Preferably, the adapter protrudes from one side away from the button to form a second limiting column; the second piezoelectric spring is provided with a second limiting hole passing through it at a position corresponding to the second limiting column; the second limiting column is inserted into the second limiting hole.

[0014] Preferably, the piezoelectric button assembly further includes a waterproof foam sleeved on the outer peripheral side of the button, and the waterproof foam abuts against the first protrusion and the second protrusion.

[0015] Preferably, the outer peripheral side of the button is recessed inward to form a receiving groove, and the waterproof foam is fixed in the receiving groove.

[0016] Preferably, a side of the button close to the piezoelectric module is recessed to form a mounting groove; the adapter is received and fixed in the mounting groove.

[0017] In a second aspect, the present invention provides an electronic device comprising a housing and the piezoelectric button assembly as described above housed in the housing; a mounting hole is provided on the side of the housing, the support frame is fixed to the housing and the button is exposed through the mounting hole. Beneficial effects

[0018] Compared with related technologies, the piezoelectric button assembly of the present invention forms a feasible technical solution for the piezoelectric button assembly by specifically defining the positional connection relationship between the support frame, piezoelectric module, flexible circuit board, button, adapter and elastic member. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0020] FIG1 is a schematic diagram of the three-dimensional structure of a piezoelectric button assembly provided by an embodiment of the present invention;

[0021] FIG2 is a schematic diagram of the structural decomposition of a piezoelectric button assembly provided by an embodiment of the present invention;

[0022] FIG3 is a cross-sectional view of line AA in FIG1 ;

[0023] FIG4 is a schematic diagram of a three-dimensional structure of an electronic device provided in an embodiment of the present invention;

[0024] FIG5 is a cross-sectional view taken along line BB in FIG4 .

[0025] In the figure, 100, piezoelectric button assembly; 1, support frame; 10, receiving groove; 11, bottom plate; 111, first limiting column; 12, first protrusion; 13, second protrusion; 2, piezoelectric module; 21, piezoelectric ceramic sheet; 22, first piezoelectric spring; 221, first limiting hole; 23, second piezoelectric spring; 231, second limiting hole; 3, flexible circuit board; 4, button; 41, receiving groove; 5, adapter; 51, second limiting column; 6, elastic member; 7, waterproof foam; 200, electronic device; 201, housing; 202, mounting hole. Modes for Carrying Out the Invention

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0027] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] It should be noted that the expressions "upper," "lower," "left," and "right" mentioned in the embodiments of the present invention are described with reference to the placement states in the accompanying drawings and should not be construed as limiting embodiments of the present invention. Furthermore, it should be understood that, in the text, when referring to an element as being "above" or "below" another element, it is possible that the element is directly "above" or "below" the other element, or it is possible that the element is "above" or "below" the other element through an intermediate element.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1

[0031] An embodiment of the present invention provides a piezoelectric button assembly 100, as shown in Figures 1 to 3, which includes a support frame 1 having a receiving groove 10, a piezoelectric module 2 received and fixed in the receiving groove 10, a flexible circuit board (FPC) 3 that passes through the support frame 1 and extends into the receiving groove 10, a button 4 that is covered on the support frame 1 and completely covers the receiving groove 10, an adapter 5 fixed between the button 4 and the piezoelectric module 2, and an elastic member 6 fixed between the button 4 and the support frame 1.

[0032] Specifically, the support frame 1 includes a flat bottom plate 11 and a first protrusion 12 and a second protrusion 13 protruding from one side of the bottom plate 11 and spaced apart from each other; the bottom plate 11 , the first protrusion 12 and the second protrusion 13 surround and form a receiving groove 10 .

[0033] The first protrusion 12 and the second protrusion 13 are respectively disposed at positions away from the end of the bottom plate 11 so that the bottom plate 11 can be provided with corresponding holes to be fixed to the housing or casing of the electronic device.

[0034] The piezoelectric module 2 includes a flat piezoelectric ceramic sheet 21 and a first piezoelectric spring 21 and a second piezoelectric spring 23 in a bow-shaped or cymbal-shaped shape; the first piezoelectric spring 21 and the second piezoelectric spring 23 are respectively located on opposite sides of the piezoelectric ceramic sheet 21, and the two ends of the first piezoelectric spring 21 are respectively fixed to the two ends of the piezoelectric ceramic sheet 21, and the middle area of ​​the first piezoelectric spring 21 is fixed to the side of the support frame 1 close to the button 4. The two ends of the second piezoelectric spring 23 are respectively fixed to the two ends of the piezoelectric ceramic sheet 21, and the middle area of ​​the second piezoelectric spring 23 is fixed to the side of the adapter 5 away from the button 4 and forms an electrical connection with the adapter 5. The flexible circuit board 3 is fixed to the side of the piezoelectric ceramic sheet 21 and forms an electrical connection with the piezoelectric ceramic sheet 21.

[0035] The first piezoelectric spring 21 and the second piezoelectric spring 23 have the same bow-shaped or cymbal-shaped structure but are installed in opposite directions. Of course, according to actual needs, the bow-shaped or cymbal-shaped structures of the two can also be designed to be different, but the installation directions need to be opposite.

[0036] In this embodiment, the first piezoelectric spring 21 and the second piezoelectric spring 23 are respectively in a bow shape.

[0037] The first piezoelectric spring 21 and the second piezoelectric spring 23 are fixed to the piezoelectric ceramic sheet 21 by glue respectively.

[0038] The support frame 1 also includes a first limiting post 111 protruding from a side of the base plate 11 near the button 4. The first piezoelectric spring 21 is provided with a first limiting hole 221 extending therethrough at a position corresponding to the first limiting post 111. The first limiting post 111 is inserted into the first limiting hole 221. This design allows the first piezoelectric spring 21 to be better secured to the base plate 11, achieving a desired positional fixation effect.

[0039] The flexible circuit board 3 passes through the middle area of ​​the base plate 11 and is fixed to the middle area of ​​the piezoelectric ceramic plate 21 .

[0040] The periphery of the button 4 near the support frame 1 is provided with waterproof foam 7. This design can achieve a certain waterproof effect after the piezoelectric button assembly 100 is installed in the corresponding electronic device.

[0041] The side of the button 4 close to the piezoelectric module 2 is recessed to form a mounting groove; the adapter 5 is received and fixed in the mounting groove. This design can make the adapter 5 better fixed to the button 4 and achieve a limited fixing effect.

[0042] A second limiting post 51 protrudes from the side of the adapter 5 away from the button 4. A second limiting hole 231 is provided through the second piezoelectric spring 23 at a position corresponding to the second limiting post 51. The second limiting post 51 is inserted into the second limiting hole 231. This design allows the second piezoelectric spring 23 to be better secured to the adapter 5 and achieves a desired positional fixation.

[0043] The adapter 5 can be connected and fixed by a snap-fit ​​structure and glue.

[0044] There are two elastic members 6 , one of which is clamped and fixed between the button 4 and the side of the first protrusion 12 away from the bottom plate 11 , and the other elastic member 6 is clamped and fixed between the button 4 and the side of the second protrusion 13 away from the bottom plate 11 .

[0045] In this embodiment, the elastic member 6 is made of foam. This design allows the button 4 to be positioned and suspended by the foam, limiting the pressing stroke of the button 4 and achieving a certain waterproof effect. Of course, depending on actual needs, the elastic member 6 can also be made of elastic rubber. If waterproofing is not a concern, a spring or shrapnel can also be used.

[0046] In this embodiment, when voltage is applied to the piezoelectric button assembly 100, the first piezoelectric spring 21 and the second piezoelectric spring 23 will amplify the contraction deformation due to their bow-shaped or cymbal-shaped structure; the opposite process is that when the first piezoelectric spring 21 and the second piezoelectric spring 23 are subjected to external force, a pulling force will be applied to the piezoelectric button assembly 100, and an induced voltage will be generated at the same time to realize the button function.

[0047] The usage process of the piezoelectric button assembly 100 in this embodiment is: press the button to trigger the induced voltage, and when the induced voltage is judged as an effective press, a driving signal is given through the flexible circuit board 3 to drive the voltage ceramic sheet to shrink and deform, thereby driving the bow-shaped or cymbal-shaped amplification structure of the first piezoelectric spring 21 and the second piezoelectric spring 23 to expand, so that the upper and lower surfaces of the voltage ceramic sheet output displacement, and the deformation of the first piezoelectric spring 21 and the second piezoelectric spring 23 is limited by the support frame 1, so that the displacement is transmitted to the button 4 through the adapter 5 to achieve tactile feedback.

[0048] The piezoelectric button assembly 100 of this embodiment forms a feasible technical solution for the piezoelectric button assembly 100 by specifically defining the positional connection relationship between the support frame 1, the piezoelectric module 2, the flexible circuit board 3, the button 4, the adapter 5 and the elastic member 6.

[0049] Example 2

[0050] An embodiment of the present invention provides an electronic device 200, as shown in Figures 1 to 5, which includes a housing 201 and a piezoelectric button assembly 100 such as the above-mentioned embodiment 1 housed in the housing 201; a mounting hole 202 is provided on the side of the housing 201, and a support frame 1 is fixed to the housing 201 so that the button 4 is exposed through the mounting hole 202.

[0051] The electronic device 200 is a mobile phone, a watch, a tablet computer, etc.

[0052] Specifically, the button 4 may also pass through the back side or other locations of the housing 201 .

[0053] Since the electronic device 200 in this embodiment includes the piezoelectric button assembly 100 in the above-mentioned embodiment 1, it can also achieve the technical effects achieved by the piezoelectric button assembly 100 in the above-mentioned embodiment 1, which will not be described in detail here.

[0054] It should be noted that the various embodiments described above with reference to the accompanying drawings are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Those skilled in the art should understand that any modifications or equivalent substitutions to the present invention that do not depart from the spirit and scope of the present invention are intended to be encompassed within the scope of the present invention. Furthermore, unless the context otherwise requires, words appearing in the singular include the plural form, and vice versa. Furthermore, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. A piezoelectric button assembly, characterized in that, the piezoelectric button assembly includes a support frame having a receiving groove, a piezoelectric module received and fixed in the receiving groove, a flexible circuit board passing through the support frame and extending into the receiving groove, a button covering the support frame and completely covering the receiving groove, an adapter seat fixed between the button and the piezoelectric module, and an elastic member fixed between the button and the support frame; the piezoelectric module includes a flat piezoelectric ceramic sheet, a first piezoelectric elastic sheet and a second piezoelectric elastic sheet which are respectively in a bow shape or a cymbal shape; the first piezoelectric elastic sheet and the second piezoelectric elastic sheet are respectively located on opposite sides of the piezoelectric ceramic sheet, both ends of the first piezoelectric elastic sheet are respectively fixed to both ends of the piezoelectric ceramic sheet, and the middle area of the first piezoelectric elastic sheet is fixed to one side of the support frame close to the button; both ends of the second piezoelectric elastic sheet are respectively fixed to both ends of the piezoelectric ceramic sheet, and the middle area of the second piezoelectric elastic sheet is fixed to one side of the adapter seat far from the button and forms an electrical connection with the adapter seat; the flexible circuit board abuts against the piezoelectric ceramic sheet and forms an electrical connection with the piezoelectric ceramic sheet.

2. The piezoelectric button assembly according to claim 1, characterized in that, the support frame includes a bottom plate, and a first protrusion and a second protrusion which protrude from one side of the bottom plate and are spaced apart from each other; the bottom plate, the first protrusion and the second protrusion surround and form the receiving groove; there are two elastic members, and one of the elastic members is clamped and fixed between the button and the first protrusion, and the other elastic member is clamped and fixed between the button and the second protrusion.

3. The piezoelectric button assembly according to claim 2, characterized in that, the support frame further includes a first limiting post protruding from one side of the bottom plate close to the button; the first piezoelectric elastic sheet is provided with a first limiting hole penetrating therethrough at a position corresponding to the first limiting post; the first limiting post is inserted into the first limiting hole.

4. The piezoelectric button assembly according to claim 2, characterized in that, the elastic member is a foam.

5. The piezoelectric button assembly according to claim 2, characterized in that, the flexible circuit board passes through the bottom plate and is fixed to the piezoelectric ceramic sheet.

6. The piezoelectric button assembly according to claim 1, characterized in that, a second limiting post protrudes from one side of the adapter seat far from the button; the second piezoelectric elastic sheet is provided with a second limiting hole penetrating therethrough at a position corresponding to the second limiting post; the second limiting post is inserted into the second limiting hole.

7. The piezoelectric button assembly according to claim 2, characterized in that, the piezoelectric button assembly further includes a waterproof foam sleeved on the outer peripheral side of the button, and the waterproof foam abuts against the first protrusion and the second protrusion.

8. The piezoelectric button assembly according to claim 7, characterized in that, a receiving groove is recessed inwardly on the outer peripheral side of the button, and the waterproof foam is fixed in the receiving groove.

9. The piezoelectric button assembly according to claim 1, characterized in that, One side of the button close to the piezoelectric module is recessed to form a mounting groove; the adapter base is received and fixed in the mounting groove.

10. An electronic device, characterized in that the electronic device includes a housing and a piezoelectric button assembly as described in any one of claims 1 to 9 received in the housing; a mounting hole is provided on a side surface of the housing, and the support frame is fixed to the housing and enables the button to be exposed through the mounting hole.

Images