CN111813225A

CN111813225A - Haptic feedback unit, haptic feedback device, and electronic apparatus

Info

Publication number: CN111813225A
Application number: CN202010661241.6A
Authority: CN
Inventors: 许春东; 沈万程; 张艳良
Original assignee: OFilm Microelectronics Technology Co Ltd
Current assignee: OFilm Microelectronics Technology Co Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2020-10-23

Abstract

A tactile feedback unit, a tactile feedback device and an electronic device are provided, wherein the tactile feedback unit comprises a piezoelectric element, a first elastic sheet and a second elastic sheet, the vertical distance from a first surface to a second surface of the piezoelectric element is a first distance, the vertical distance from a first side surface to a second side surface is a second distance, the first distance is smaller than the second distance, the first elastic sheet is connected to the first side surface, the second elastic sheet is connected to the second side surface, one side of the first elastic sheet, which is back to the first side surface, is used for being connected to a fixed member, and one side of the second elastic sheet, which is back to the second side surface, is used for being connected to a; the piezoelectric element receives the driving voltage signal to deform, and drives the first elastic sheet and the second elastic sheet to elastically deform, so that the moving part generates displacement relative to the fixing part. Set up first shell fragment and second shell fragment as the medium, conduct the deformation of piezoelectric element to the moving part, can amplify the small deformation of piezoelectric element for the tactile feedback is respond well.

Description

Haptic feedback unit, haptic feedback device, and electronic apparatus

Technical Field

The invention belongs to the technical field of tactile feedback, and particularly relates to a tactile feedback unit, a tactile feedback device and electronic equipment.

Background

Piezoelectric materials have a piezoelectric effect and an inverse piezoelectric effect, and have applications in a variety of technical fields. Manufacturers research that piezoelectric materials are used for realizing touch feedback, and the principle of the touch feedback is that voltage is applied to the piezoelectric materials by utilizing the inverse piezoelectric effect of the piezoelectric materials, the piezoelectric materials generate deformation, and the deformation is conducted to fingers of people to realize touch feedback. However, in the current technical solution, the tactile feedback effect is not good when the piezoelectric material is applied.

Disclosure of Invention

An object of the present invention is to provide a haptic feedback unit, a haptic feedback device, and an electronic apparatus, which can have a good haptic feedback effect.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the present invention provides a haptic feedback unit, including a piezoelectric element, a first elastic sheet and a second elastic sheet, where the piezoelectric element includes a first surface and a second surface that are parallel to and opposite to each other, and a first side surface and a second side surface that are parallel to and opposite to each other, a vertical distance from the first surface to the second surface is a first distance, a vertical distance from the first side surface to the second side surface is a second distance, the first distance is smaller than the second distance, the first elastic sheet is connected to the first side surface, the second elastic sheet is connected to the second side surface, a side of the first elastic sheet facing away from the first side surface is used for connecting to a fixed member, and a side of the second elastic sheet facing away from the second side surface is used for connecting to a movable member; the piezoelectric element deforms after receiving a driving voltage signal, and drives the first elastic sheet and the second elastic sheet to elastically deform, so that the moving element generates displacement relative to the fixing element.

Through setting up first shell fragment and second shell fragment as the medium, conduct the moving part with the deformation of piezoelectric element, can amplify the small deformation of piezoelectric element for the tactile feedback is respond well. The first elastic sheet is arranged on the first side face, the second elastic sheet is arranged on the second side face, the first distance from the first surface to the second surface is smaller than the second distance from the first side face to the second side face, the thickness of the piezoelectric element can be thinner, the cost is saved, the overall thickness of the tactile feedback unit can be reduced, and the electronic equipment using the tactile feedback unit of the embodiment is convenient to lighten and thin. In addition, the first surface or the second surface with larger area is convenient to be provided with electrode connection positions, is convenient to be connected with the electrodes for inputting driving voltage signals, and is high in connection reliability.

In one embodiment, the piezoelectric element extends along a first direction, and has a first symmetry axis in the first direction, a line connecting a midpoint of the first side surface to a midpoint of the second side surface is a second symmetry axis, and the first elastic sheet and the second elastic sheet are symmetrical with respect to both the first symmetry axis and the second symmetry axis. Through setting up first shell fragment and second shell fragment for first symmetry axis with the second symmetry axis is equal symmetry for the structure of first shell fragment and second shell fragment is simplified and interchangeable, and convenient the manufacturing also makes when piezoelectric element warp and drives first shell fragment and second shell fragment and warp, the deformability and the deformation effect symmetry of first shell fragment and second shell fragment can export even and unanimous pulling force or thrust, drives the moving part for carrying out regular removal.

In one embodiment, the first elastic sheet includes a first connecting portion, a first extending portion, a second connecting portion, a second extending portion and a third connecting portion, which are connected in sequence, the first connecting portion and the third connecting portion are connected to the first side surface along two ends of the first direction, the second connecting portion and the first side surface have a spacing distance, the second symmetric axis passes through the center of the second connecting portion, the second connecting portion is used for being connected with the fixing member, the piezoelectric member generates a telescopic deformation along the first direction, and the piezoelectric member drives the first extending portion and the second extending portion to elastically deform. Through the structure that sets up three connecting portion (being first connecting portion, second connecting portion and third connecting portion) and two extensions (being first extension and second extension) of first shell fragment, simple structure, can be stable be connected with piezoelectric element and mounting, has good elastic deformation ability simultaneously again for tactile feedback unit can have stronger driving force.

In one embodiment, the haptic feedback unit further includes a flexible circuit board, the flexible circuit board includes a positive electrode connecting portion and a negative electrode connecting portion, the piezoelectric element includes a positive electrode connecting portion and a negative electrode connecting portion, the positive electrode connecting portion is connected with the positive electrode connecting portion, the negative electrode connecting portion is connected with the negative electrode connecting portion, the positive electrode connecting portion and the negative electrode connecting portion are both disposed on the first surface, and an insulating portion is disposed between the positive electrode connecting portion and the negative electrode connecting portion. . The positive electrode connecting part and the positive electrode connecting part of the flexible circuit board are arranged to be connected, and the negative electrode connecting part are connected, so that the flexible circuit board is simple in structure, stable in structure and not easy to damage; the positive electrode connecting part and the negative electrode connecting part are arranged on the same surface and can be conveniently connected with the positive electrode connecting part and the negative electrode connecting part of the flexible circuit board; the area of first surface is bigger than the area of other faces such as first side for positive electrode connecting portion and negative electrode connecting portion do bigger, can have bigger connecting area with the flexible circuit board, reinforcing structural stability.

In one embodiment, the positive electrode connection portion and the negative electrode connection portion are located at the same end of the first surface in the extending direction of the piezoelectric element.

In one embodiment, the tactile feedback unit further includes a protective layer disposed on the first surface, and the protective layer extends to the first side surface and the second side surface to cover a connection position of the piezoelectric element and the first elastic sheet and the second elastic sheet. The protective layer is arranged to cover the connecting position of the piezoelectric element and the first elastic sheet and the second elastic sheet, and the effect of protecting the adhesive structure between the first elastic sheet and the piezoelectric element and between the second elastic sheet and the piezoelectric element is achieved.

In a second aspect, the present invention provides a haptic feedback device comprising a stationary member, a movable member, and a haptic feedback unit according to any one of the various embodiments of the first aspect, the haptic feedback unit being connected between the stationary member and the movable member.

In one embodiment, the fixed member is in an annular frame shape and encloses a first accommodating space, the number of the tactile feedback units is two, the two tactile feedback units and the movable member are accommodated in the first accommodating space, and two opposite sides of the movable member are respectively provided with one tactile feedback unit. By providing the annular frame-shaped structure of the fixing member and forming the first accommodating space to accommodate other devices, the overall structure of the tactile feedback device is compact, for example, space is saved, and manufacturing and assembling are facilitated.

In one embodiment, the movable member is in an annular frame shape and encloses a second accommodating space, the number of the tactile feedback units is two, the two tactile feedback units and the fixed member are accommodated in the second accommodating space, and two opposite sides of the fixed member are respectively provided with one tactile feedback unit. The fixed part is in an annular frame shape, the moving part is accommodated in the scheme exchange position of the first accommodating space, namely the moving part is in the annular frame shape, and the fixed part is accommodated in the second accommodating space, so that the aim that the moving part is driven by elastic deformation of the touch feedback unit to move relative to the fixed part can be achieved.

In a third aspect, the invention provides an electronic device comprising a haptic feedback apparatus as described in any of the various embodiments of the second aspect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1a is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 1b is a schematic diagram of a side view of the haptic feedback unit of FIG. 1 a;

FIG. 1c is a schematic diagram of the motion of a haptic feedback device of an embodiment;

FIG. 2a is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 2b is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 2c is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 3a is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 3b is a schematic diagram of the structure at a process step Q in FIG. 3 a;

FIG. 3c is a schematic diagram of the structure at a process step Q in FIG. 3 a;

FIG. 3d is a schematic diagram of the structure at a process step Q in FIG. 3 a;

FIG. 3e is an enlarged partial view of FIG. 3a at Q;

FIG. 3f is a schematic diagram of the structure of the flexible circuit board in one process step at Q of FIG. 3 a;

FIG. 3g is a schematic cross-sectional view taken along line M of FIG. 3 e;

FIG. 3h is a schematic cross-sectional view taken along line N in FIG. 3 e;

FIG. 3i is a schematic diagram of the structure at a process step Q in FIG. 3 a;

FIG. 3j is a schematic diagram of the structure at a process step Q in FIG. 3 a;

FIG. 3k is an enlarged partial schematic view of the structure at Q of FIG. 3 a;

FIG. 3l is a schematic diagram of the structure of the flexible circuit board in one process step at Q in FIG. 3 a;

FIG. 3m is a schematic cross-sectional view along E in FIG. 3 k;

FIG. 3n is a schematic cross-sectional view taken along F in FIG. 3 k;

FIG. 4a is a schematic diagram of a haptic feedback unit of an embodiment;

FIG. 4b is a schematic diagram of a side view of a haptic feedback unit of an embodiment;

FIG. 5a is a schematic diagram of a haptic feedback device according to an embodiment;

FIG. 5b is a schematic diagram of the structure of a haptic feedback device of an embodiment;

FIG. 5c is a schematic diagram of a side view of a haptic feedback device of an embodiment;

FIG. 5d is a schematic diagram of a side view of a haptic feedback device of an embodiment;

FIG. 5e is a schematic diagram of a haptic feedback device of an embodiment;

FIG. 5f is a schematic cross-sectional view of one embodiment of a haptic feedback device;

FIG. 5g is a schematic diagram of a haptic feedback device of an embodiment;

FIG. 5h is a schematic diagram of a side view of one embodiment of a haptic feedback device;

FIG. 5i is a schematic diagram of a haptic feedback device according to an embodiment;

FIG. 5j is a schematic diagram of a haptic feedback device of an embodiment;

FIG. 6a is a schematic diagram of a haptic feedback device in accordance with an embodiment;

FIG. 6b is a schematic diagram of a side view configuration of a haptic feedback device of an embodiment;

FIG. 6c is a schematic diagram of a side view of a haptic feedback device of an embodiment;

FIG. 7a is a schematic diagram of a circuit connection configuration of a haptic feedback device according to an embodiment;

FIG. 7b is a schematic diagram of a circuit connection side view of one embodiment of a haptic feedback device;

FIG. 7c is a schematic diagram of a circuit connection side view of one embodiment of a haptic feedback device;

FIG. 8a is a schematic diagram of a haptic feedback device in accordance with an embodiment;

FIG. 8b is a schematic diagram of the structure of a haptic feedback device of an embodiment;

FIG. 8c is a schematic diagram of the structure of a haptic feedback device of an embodiment;

FIG. 8d is a schematic diagram of the structure of a haptic feedback device of an embodiment;

FIG. 8e is a schematic diagram of a haptic feedback device according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1a and fig. 1b, an embodiment of the invention provides a haptic feedback unit 100, which includes a piezoelectric element 10, a first elastic sheet 21 and a second elastic sheet 22.

The piezoelectric element 10 includes a first surface 101 and a second surface 102 parallel to and opposite to each other, and a first side 103 and a second side 104 parallel to and opposite to each other. The first side 103 connects the first surface 101 and the second surface 102, and the second side 104 also connects the first surface 101 and the second surface 102. The vertical distance from the first surface 101 to the second surface 102 is a first distance H, which is the thickness of the piezoelectric element 10; the vertical distance from the first side 103 to the second side 104 is a second distance W, which is the width of the piezoelectric element 10, and the first distance H is smaller than the second distance W, i.e. the thickness of the piezoelectric element 10 is smaller than the width.

The first elastic sheet 21 is connected to the first side surface 103, and the second elastic sheet 22 is connected to the second side surface 104. Referring to fig. 1a, fig. 1b and fig. 5e, a side of the first resilient sheet 21 facing away from the first side surface 103 is used to connect to the fixed member 200, and a side of the second resilient sheet 22 facing away from the second side surface 104 is used to connect to the movable member 300.

Referring to fig. 1a and 1c, the piezoelectric element 10 deforms when receiving the driving voltage signal, and drives the first elastic piece 21 and the second elastic piece 22 to elastically deform, so that the movable element 300 displaces relative to the fixed element 200.

In this embodiment, referring to fig. 1c, two haptic feedback units with the same structure, namely, the first haptic feedback unit 110 and the second haptic feedback unit 120 are taken as an example for explanation, the first haptic feedback unit 110 and the second haptic feedback unit 120 are respectively disposed on two opposite sides of the movable member 300 and are respectively connected to the fixed member 200. The moveable member 300 is at the first position T1 relative to the stationary member 200 when the first and second

haptic feedback units

110 and 120 do not receive the driving voltage signal. When the driving voltage signal is applied to the first tactile feedback unit 110 and the second tactile feedback unit 120, the first tactile feedback unit 110 and the second tactile feedback unit 120 are elastically deformed, and the movable member 300 is driven to move from the first position T1 to the second position T2 relative to the stationary member 200. By setting the frequency of the driving voltage signal, the first haptic feedback unit 110 and the second haptic feedback unit 120 can be continuously and elastically deformed, so that the movable member 300 is driven to vibrate relative to the stationary member 200, and the vibration is fed back by the movable member 200, so that a person can feel the vibration feedback.

In this embodiment, the first elastic sheet 21 and the second elastic sheet 22 are arranged as media to transmit the deformation of the piezoelectric device 10 to the movable member 300, so as to amplify the micro deformation of the piezoelectric device 10, and achieve a good tactile feedback effect. In this embodiment, the specific structures of the first elastic sheet 21 and the second elastic sheet 22 are not limited, as long as the elastic deformation of the piezoelectric element 10 can drive the first elastic sheet 21 and the second elastic sheet 22 to elastically deform.

In this embodiment, the first elastic sheet 21 is disposed on the first side surface 103, the second elastic sheet 22 is disposed on the second side surface 104, and the first distance H from the first surface 101 to the second surface 102 is smaller than the second distance W from the first side surface 103 to the second side surface 104, so that the thickness of the piezoelectric element 10 can be made thinner, the cost is saved, the overall thickness of the haptic feedback unit 100 can be reduced, and the electronic device using the haptic feedback unit 100 of this embodiment is light and thin. In addition, the first surface 101 or the second surface 102 with a larger area also facilitates the arrangement of electrode connection positions, facilitates the connection with electrodes for inputting driving voltage signals, and has high connection reliability.

In this embodiment, the piezoelectric element 10 includes piezoelectric ceramics, and the structure of the piezoelectric element may be that a positive electrode layer and a negative electrode layer are respectively disposed on the upper and lower side surfaces of a single layer of piezoelectric ceramics; the piezoelectric element 10 may also be configured as a multilayer piezoelectric ceramic, each of which is provided in a laminated manner with a positive electrode layer and a negative electrode layer in this order. The first elastic sheet 21 and the second elastic sheet 22 are made of metal or metal alloy, for example.

In one embodiment, referring to fig. 1a and 1b, the piezoelectric element 10 extends along a first direction Y and has a first symmetry axis a in the first direction Y. A connecting line from the midpoint of the first side surface 103 to the midpoint of the second side surface 104 is a second symmetry axis B, and the first elastic sheet 21 and the second elastic sheet 22 are symmetrical with respect to both the first symmetry axis a and the second symmetry axis B.

In this embodiment, the first elastic sheet 21 and the second elastic sheet 22 are symmetrical with respect to the first symmetry axis a and the second symmetry axis B, so that the structures of the first elastic sheet 21 and the second elastic sheet 22 are simplified and can be interchanged, and the piezoelectric element 10 is deformed to drive the first elastic sheet 21 and the second elastic sheet 22 to deform, so that the deformability and the deformation effect of the first elastic sheet 21 and the second elastic sheet 22 are symmetrical, and uniform and consistent pulling force or pushing force can be output to drive the movable element 300 to regularly move with respect to the movable element 200.

In an embodiment, referring to fig. 1a and fig. 1b, the first elastic sheet 21 includes a first connecting portion 211, a first extending portion 212, a second connecting portion 213, a second extending portion 214, and a third connecting portion 215 connected in sequence. The first connection portion 211 and the third connection portion 215 are respectively connected to both ends of the first side surface 103 in the first direction Y. The second connection portion 213 has a spaced distance from the first side surface 103, and the second axis of symmetry B passes through the center of the second connection portion 213. Referring to fig. 1a and fig. 1c, the second connecting portion 213 is used for connecting with the fixing element 200, the piezoelectric element 10 generates a stretching deformation along the first direction Y, and the piezoelectric element 10 drives the first extending portion 212 and the second extending portion 214 to elastically deform, specifically, to vibrate along the second axis of symmetry.

In this embodiment, the structure of the second elastic sheet 22 is symmetrical to that of the first elastic sheet 21, and the difference is that the second connecting portion of the second elastic sheet 22 is used for connecting with the moving member 300.

In this embodiment, by providing the three connecting portions (i.e., the first connecting portion 211, the second connecting portion 213, and the third connecting portion 215) and the two extending portions (i.e., the first extending portion 212 and the second extending portion 214) of the first elastic sheet 21, the structure is simple, the first elastic sheet can be stably connected to the piezoelectric element 10 and the fixing member 200, and the tactile feedback unit 100 has good elastic deformation capability, so that the tactile feedback unit has strong driving capability.

In one embodiment, referring to fig. 1a and fig. 2a, the tactile feedback unit 100 further includes a flexible circuit board 30, and the flexible circuit board 30 includes a positive connection portion 31 and a negative connection portion 32. The piezoelectric element 10 includes a positive electrode connection portion 11 and a negative electrode connection portion 12, a positive electrode connection portion 31 connected to the positive electrode connection portion 11, and a negative electrode connection portion 32 connected to the negative electrode connection portion 12.

In the present embodiment, the positive electrode connection portion 11 and the negative electrode connection portion 12 of the piezoelectric element 10 may be arbitrarily arranged, and only the positive electrode connection portion 11 and the negative electrode connection portion 12 need to be directly insulated. For example, the positive electrode connection portion 11 is provided on the first surface 101, and the negative electrode connection portion 12 is provided on the second surface 102; or, the positive electrode connection portion 11 is provided on the first surface 101, the negative electrode connection portion 12 is provided on the first side surface 103, and the like, without illustration. The positive electrode connecting portion 11 and the negative electrode connecting portion 12 may be a metal layer (such as a silver paste coating) formed on the piezoelectric element 10, to which an electrode lead-out in the piezoelectric element 10 is connected, or may be directly formed in an electrode lead-out structure in the piezoelectric element 10.

In this embodiment, the positive connection portion 31 and the negative connection portion 32 of the flexible circuit board 30 may be contacts led out from the main body, and the positive connection portion 31 and the negative connection portion 32 are both provided with metal connection points to connect with the positive connection portion 11 and the negative connection portion 12 and achieve electrical conduction.

In this embodiment, the positive electrode connecting portion 31 and the positive electrode connecting portion 11 of the flexible circuit board 30 are connected, and the negative electrode connecting portion 32 and the negative electrode connecting portion 12 are connected, so that the structure is simple, the structure is stable, and the flexible circuit board is not easily damaged.

In one embodiment, referring to fig. 1a, fig. 1b and fig. 2a, the positive electrode connecting portion 11 and the negative electrode connecting portion 12 are disposed on the first surface 101, and the insulating portion 13 is disposed between the positive electrode connecting portion 11 and the negative electrode connecting portion 12.

In the present embodiment, the positive electrode connecting portion 11 and the negative electrode connecting portion 12 are disposed on the same surface, and can be easily connected to the positive electrode connecting portion 31 and the negative electrode connecting portion 32 of the flexible circuit board 30; the area of the first surface 101 is larger than the area of the other surfaces such as the first side surface 103, so that the positive electrode connecting part 11 and the negative electrode connecting part 12 can be made larger, the connecting area with the flexible circuit board 30 can be larger, and the structural stability is enhanced.

In this embodiment, the insulating portion 13 is made of an insulating material and is used to prevent the short circuit between the positive electrode connecting portion 11 and the negative electrode connecting portion 12. The areas of the positive electrode connecting portion 11 and the negative electrode connecting portion 12 may be the same, or different, without limitation, for example, the positive electrode connecting portion 11 and the negative electrode connecting portion 12 shown in fig. 2c (i.e., in the position where the positive electrode connecting portion 31 and the negative electrode connecting portion 32 are covered) are located at the same end of the first surface 101 along the extending direction of the piezoelectric element 10, and the areas of the positive electrode connecting portion 11 and the negative electrode connecting portion 12 shown in fig. 2c are smaller than those of the positive electrode connecting portion 11 and the negative electrode connecting portion 12 shown in fig. 1 a. The areas of the positive electrode connection part 31 and the negative electrode connection part 32 may be larger than those of the positive electrode connection part 11 and the negative electrode connection part 12 so that the positive electrode connection part 11 and the negative electrode connection part 12 are not exposed to the outside and have a protective effect. It is understood that the positive electrode connection part 31 and the negative electrode connection part 32 have a spaced distance therebetween to prevent a short circuit.

In the present embodiment, the positive electrode connection portion 11 is connected to the positive electrode layer, and the positive electrode connection portion 11 may be formed by leading the positive electrode layer from the first side surface 103 or the second side surface 104 to the first surface 101 through the side electrode. The negative electrode connection portion 12 can also be formed by leading out the negative electrode layer to the first surface 101 through the side electrode, similarly.

In other embodiments, the insulating part 13 may not be provided, but the object of avoiding short circuit may be achieved by the positive electrode connecting part 11 and the negative electrode connecting part 12 directly having a spacing distance.

In an embodiment, referring to fig. 2b and fig. 2c and referring to fig. 1b, the tactile feedback unit 100 further includes a protection layer 40, the protection layer 40 is disposed on the first surface 101, and the protection layer 40 extends to the first side surface 103 and the second side surface 104 to cover the connection positions of the piezoelectric element 10 and the first elastic piece 21 and the second elastic piece 22.

In this embodiment, since the first elastic sheet 21, the second elastic sheet 22 and the piezoelectric element 10 are usually bonded, and are easily corroded by water vapor in the air, so that the bonding is not effective, the protective layer 40 is disposed to extend to the first side surface 103 and the second side surface 104 to cover the connection positions of the piezoelectric element 10 and the first elastic sheet 21 and the second elastic sheet 22, and the bonding structure between the first elastic sheet 21 and the piezoelectric element 10 and the second elastic sheet 22 is protected. The material of the protection layer 40 is, for example, glue.

In this embodiment, the protection layer 40 may be disposed on a part of the first surface 101, or may be disposed on the entire first surface 101. Referring to fig. 2b, in an embodiment, the protection layers are respectively disposed at two ends of the first surface 101, namely, the first protection layer 41 and the second protection layer 42. Referring to fig. 2c, in an embodiment, the protection layer 40 may also be disposed at one end of the first surface 101, the other end where the positive electrode connecting portion 31 and the negative electrode connecting portion 32 are disposed is not disposed, and the absence of the protection layer 40 is to consider that although water vapor may affect the adhesive structure between the elastic sheet and the piezoelectric element 10, the effect is still within a controllable range, so as to prevent the protection layer 40 from affecting the structure and the electrical connection stability of the positive electrode connecting portion 31 and the negative electrode connecting portion 32.

In the present embodiment, the protective layer 40 may be directly disposed on the first surface 101, and the positive electrode connection portion 11 and the negative electrode connection portion 12 may be disposed on the protective layer 40. The protective layer 40 may also be disposed on a side of the flexible circuit board 30 facing away from the first surface 101.

In an embodiment, referring to fig. 3a to 3d and fig. 3f, and referring to fig. 1b, the positive electrode connecting portion 11 and the negative electrode connecting portion 12 are disposed on the same side, for example, both disposed on the first surface 101. The positive electrode connecting portion 11 and the negative electrode connecting portion 12 have a spacing distance therebetween, and the space of the spacing distance may be provided with an insulating portion, as described in the foregoing embodiments. The positive electrode connection portion 31 is connected to the positive electrode connection portion 11, and the negative electrode connection portion 32 is connected to the negative electrode connection portion 12.

The haptic feedback unit 100 further includes an insulating layer 15, the insulating layer 15 being disposed on the first surface 101, the positive electrode connection part 11 and the negative electrode connection part 12 being both disposed on the insulating layer 15, the positive electrode connection part 11 and the negative electrode connection part 12 being electrically connected with an electrode of the first side surface 103 or the second side surface 104.

In the present embodiment, by providing the insulating layer 15 to isolate the positive electrode connecting portion 11 and the negative electrode connecting portion 12 from the piezoelectric element 10, the positive electrode connecting portion 11 and the negative electrode connecting portion 12 can be prevented from being short-circuited with the electrode inside the piezoelectric element 10. The positive electrode connecting portion 11 and the negative electrode connecting portion 12 are electrically connected to the electrodes of the first side surface 103 or the second side surface 104, and electrically connected to the internal electrodes of the piezoelectric element 10. The material of the insulating layer 15 is, for example, insulating ink.

In this embodiment, the connection positions of the first elastic sheet 21 and the second elastic sheet 22 with the piezoelectric element 21 need not be limited, and optionally, the first elastic sheet 21 is connected to the first side surface 103, and the second elastic sheet 22 is connected to the second side surface 104.

In one embodiment, referring to fig. 3c, 3d and 3h, the tactile feedback unit further includes an insulating glue layer 16, the insulating glue layer 16 is disposed on the insulating layer 15 spaced between the positive electrode connecting portion 11 and the negative electrode connecting portion 12, and the insulating glue layer 16 connects the insulating layer 15 and the flexible circuit board 30 and is used for insulating and isolating the positive electrode connecting portion 11 and the negative electrode connecting portion 12.

In this embodiment, the insulating layer 15 and the flexible circuit board 30 are connected by the insulating adhesive layer 16, and the flexible circuit board 30, the insulating layer 15, the piezoelectric element 10, and the like are integrated, so that the structure is more stable. The insulating adhesive layer 16 is, for example, a DAF (Die attach film) film, which is nonconductive and has good insulating and adhesive properties.

In one embodiment, referring to fig. 3e and fig. 3g, the conductive adhesive 17 is disposed between the positive electrode connecting portion 31 and the positive electrode connecting portion 11 for conductive connection. Because the insulating layer 15 is connected with the flexible circuit board 30 through the insulating glue layer 16, and then the positive electrode connecting portion 31 and the positive electrode connecting portion 11 are glued and electrically connected in a point conductive glue 17 manner, the overall structure is more stable. It is understood that a conductive paste may be dispensed between the negative electrode connecting portion 32 and the negative electrode connecting portion 12.

Referring to fig. 3a to 3h, a manufacturing process of the haptic feedback unit according to an embodiment includes: brushing an insulating layer 15 on the first surface 101 of the piezoelectric element 10; printing the positive electrode connection part 11 and the negative electrode connection part 12 on the insulating layer 15; manufacturing an insulating glue layer 16 in an interval area between the positive electrode connecting part 11 and the negative electrode connecting part 12; attaching the flexible circuit board 30 to the insulating adhesive layer 16, wherein the positive electrode connecting part 31 corresponds to the positive electrode connecting part 11, and the negative electrode connecting part 32 corresponds to the negative electrode connecting part 12; the conductive paste 17 is dispensed between the positive electrode connection portion 31 and the positive electrode connection portion 11, and the conductive paste 17 is dispensed between the negative electrode connection portion 32 and the negative electrode connection portion 12.

In one embodiment, referring to fig. 3i to 3m, the tactile feedback unit further includes a first conductive adhesive layer 181 and a second conductive adhesive layer 182, the first conductive adhesive layer 181 connects the positive electrode connecting portion 31 and the positive electrode connecting portion 11, and the second conductive adhesive layer 182 connects the negative electrode connecting portion 32 and the negative electrode connecting portion 12.

In this embodiment, the insulating adhesive layer 16 (refer to fig. 3h) is not required to be disposed between the insulating layer 15 and the flexible circuit board 30, but the first conductive adhesive layer 181 and the second conductive adhesive layer 182 are adhered to each other to realize adhesion and electrical connection, and no conductive adhesive is required to be disposed subsequently, which can reduce the number of processes. In order to enhance the adhesive bonding stability, the areas of the positive electrode connection portion 11 and the negative electrode connection portion 12 may be made larger. In this embodiment, the first Conductive adhesive layer 181 and the second Conductive adhesive layer 182 may be Anisotropic Conductive Paste (ACP) or Anisotropic Conductive Film (ACF), and are Conductive and adhesive.

Referring to fig. 3k and 3n, the space between the positive electrode connecting portion 11 and the negative electrode connecting portion 12, i.e. between the insulating layer 15 and the flexible circuit board 30, may not be filled, so that the first conductive adhesive layer 181, the second conductive adhesive layer 182, the insulating layer 15 and the flexible circuit board 30 enclose to form the cavity 19. In other embodiments, as shown in the embodiments of fig. 3b to 3h, the cavity 19 may be filled with an insulating glue layer. Or, the first conductive adhesive layer 181 and the second conductive adhesive layer 182 are an integral whole adhesive layer structure, and the cavity 19 may also be filled up at the same time, and the first conductive adhesive layer 181 and the second conductive adhesive layer 182 are anisotropic conductive adhesives and can only conduct electricity in a single direction (i.e., vertical conduction and horizontal conduction), so that the short circuit between the positive electrode connecting portion 11 and the negative electrode connecting portion 12 is not caused.

Referring to fig. 3i to 3n, a manufacturing process of the haptic feedback unit according to an embodiment includes: brushing an insulating layer 15 on the first surface 101 of the piezoelectric element 10; printing the positive electrode connection part 11 and the negative electrode connection part 12 on the insulating layer 15; a first conductive adhesive layer 181 is formed on the positive electrode connecting portion 11, and a second conductive adhesive layer 182 is formed on the negative electrode connecting portion 12; the positive electrode connecting portion 31 of the flexible circuit board 30 is adhered to the first conductive adhesive layer 181, and the negative electrode connecting portion 32 is adhered to the second conductive adhesive layer 182.

In an embodiment, referring to fig. 1a and fig. 4a, in the extending direction of the second axis of symmetry B, the size of the second connecting portion 213 is the width of the first elastic sheet 21. When the width of the first elastic sheet 21 is the first width W1, the driving force of the haptic feedback unit 100 is the first driving force. When the driving force required by the haptic feedback unit 100 is the second driving force, and the second driving force is smaller than the first driving force, the width of the first elastic piece 21 is set to be the second width W2, and the second width W2 is greater than the first width W1.

In this embodiment, under the condition that the structure and the size of the piezoelectric element 10 are not changed and the driving voltage signal is also not changed, the driving force can be changed by changing the width of the first elastic sheet 21. When the second width W2 is greater than the first width W1, the second driving force is smaller than the first driving force. In other words, the driving force is reduced when the width of the first resilient piece 21 is increased. It can be understood that when the second width W2 is smaller than the first width W1, the second driving force is larger than the first driving force, i.e., the width of the first elastic sheet 21 is narrowed, the driving force is increased. Therefore, by adjusting the width of the first elastic sheet 21, the driving force of the haptic feedback unit 100 can be adjusted.

In an embodiment, referring to fig. 1a, fig. 1b and fig. 4b, in a direction perpendicular to the first surface 101, a dimension of the first elastic sheet 21 is a thickness of the first elastic sheet 21. When the thickness of the first elastic sheet 21 is the first thickness H1, the driving force of the haptic feedback unit 100 is a third driving force. When the driving force required by the haptic feedback unit 100 is the fourth driving force and the fourth driving force is less than the third driving force, the thickness of the first elastic sheet 21 is set to be the second thickness H2, and the second thickness H2 is greater than the first thickness H1.

In this embodiment, under the condition that the structure and size of the piezoelectric element 10 are not changed and the driving voltage signal is also not changed, the driving force can be changed by changing the thickness of the first elastic sheet 21. When the second thickness H2 is greater than the first thickness H1, the second driving force is less than the first driving force. In other words, if the thickness of the first resilient piece 21 is increased, the driving force is decreased. It can be understood that, when the second thickness H2 is smaller than the first thickness H1, the second driving force is larger than the first driving force, i.e., the thickness of the first elastic sheet 21 is thinner, the driving force is increased. Therefore, by adjusting the thickness of the first elastic sheet 21, the driving force of the haptic feedback unit 100 can be adjusted.

Referring to fig. 5a and 5e, an embodiment of the invention further provides a haptic feedback device, which includes a stationary member 200, a movable member 300 and the haptic feedback unit 100 according to the embodiment of the invention, wherein the haptic feedback unit 100 is connected between the stationary member 200 and the movable member 300.

Optionally, referring to fig. 5e, the number of the tactile feedback units is two, that is, the first tactile feedback unit 110 and the second tactile feedback unit 120 are respectively disposed on two opposite sides of the movable member 300, and the movable member 300 is driven to move relative to the fixed member 200 by the deformation of the two tactile feedback units.

Optionally, referring to fig. 5e, the embodiment is substantially the same as the embodiment shown in fig. 5a, except that the number of the tactile feedback units 100 is 1, and the movable member 300 is driven to move relative to the fixed member by the deformation of one tactile feedback unit 100.

In this embodiment, the haptic feedback unit 100 provided in the embodiment of the present invention is connected to the fixed member 200 and the movable member 300, and the movable member 300 is driven to move relative to the fixed member 200 by the elastic deformation of the haptic feedback unit 100, so that the haptic feedback is implemented, and the structure is simple.

In one embodiment, with continued reference to fig. 5a and 5e, the fixed member 200 is shaped like an annular frame and encloses a first accommodating space, and the first and second

haptic feedback units

110 and 120 and the movable member 300 are accommodated in the first accommodating space.

In this embodiment, the ring frame of the fixing member 200 may have a rectangular frame shape, a circular frame shape, or the like. For example, fig. 5a shows that the ring-shaped frame of the fixing member 200 is a rectangular frame, and fig. 5j shows that the ring-shaped frame of the fixing member 200 is a circular frame. It is understood that the ring frame of the fixing member 200 may have other shapes, and thus, the description thereof is omitted.

In this embodiment, by providing the annular frame-like structure of the fixing member 200 and forming the first accommodating space to accommodate other devices, the overall structure of the haptic feedback device is compact, for example, space-saving, and easy to manufacture and assemble.

In other embodiments, the stationary member 200 may not be frame-shaped, for example, as shown in FIG. 5g, the stationary member 200 and the movable member 300 are plate-shaped and arranged side by side, and the haptic feedback unit 100 connects the stationary member 200 and the movable member 300.

Referring to fig. 5a, the first haptic feedback unit 110 and the second haptic feedback unit 120 can be disposed in a transverse direction, so as to drive the movable member 300 to move in the transverse direction (the direction indicated by the arrow in fig. 5 a) relative to the stationary member 200.

Referring to fig. 5b, the first haptic feedback unit 110 and the second haptic feedback unit 120 can be disposed along a longitudinal direction, so as to drive the movable member 300 to move along the longitudinal direction (the direction indicated by the arrow in fig. 5 b) relative to the stationary member 200.

In one embodiment, referring to fig. 5a and 5e, similar to the fixing member 200 having an annular frame shape, the movable member is disposed in the annular frame shape and encloses the second accommodating space, and the first tactile feedback unit, the second tactile feedback unit and the fixing member are accommodated in the second accommodating space.

In this embodiment, the fixing element 200 of the previous embodiment is in a ring frame shape, the movable element 300 is accommodated in the first accommodation space at an alternative position, that is, the movable element is in a ring frame shape, and the fixing element is accommodated in the second accommodation space, so that the purpose that the movable element is driven to move relative to the fixing element by the elastic deformation of the tactile feedback unit can also be achieved.

It should be understood that, no matter the stationary member 200 is in the shape of an annular frame, the movable member 300 is accommodated in the first accommodating space, or the stationary member and the movable member are exchanged, the movable member 300 should have a distance from the stationary member 200 during the movement process without touching, so as to avoid damaging the device by collision.

In one embodiment, referring to fig. 5e, the first resilient sheet 21 and the fixed member 200 are integrated, the second resilient sheet 22 and the movable member 300 are integrated, and the piezoelectric element 10 is connected between the first resilient sheet 21 and the second resilient sheet 22.

In this embodiment, the fixed member 200 and the first resilient sheet 21 can be formed on the same metal plate, and the movable member 300 and the second resilient sheet 22 can be formed on the same metal plate. Through setting up first shell fragment 21 and mounting 200 formula structure as an organic whole, second shell fragment 22 and moving part 300 formula structure as an organic whole for need not set up the connection process again between first shell fragment 21 and the mounting 200, and the intensity of formula structure is high, and the connection is firm, and second shell fragment 22 and moving part 300 formula structure as an organic whole also have the same technological effect.

Specifically, referring to fig. 5e and with reference to fig. 1b, a side of the first resilient sheet 21, which is opposite to the first side surface 103, and the fixed member 300 are integrated, and a side of the second resilient sheet 22, which is opposite to the second side surface 104, and the movable member 300 are integrated. The integrated structure of the first elastic sheet 21 and the fixing member 200 does not affect the elastic deformation of the first elastic sheet 21, and the second elastic sheet 22 has the same technical effect.

Further, please refer to fig. 1a, fig. 1b and fig. 5e, taking the first elastic sheet 21 as an example, the second elastic sheet 22 may be referred to. The second connecting portion 213 of the first resilient piece 21 and the fixing member 200 are integrated. In this way, first extension 212 and second extension 214 can be freely deformed without being affected by fastener 200.

In one embodiment, referring to fig. 5a and 5d, the tactile feedback device further includes a touch cover 500, the touch cover 500 is connected to the movable element 300, the fixed element 300 is fixed to a fixed position such as a housing of the electronic device, and when the movable element 300 moves relative to the fixed element 200, the touch cover 500 is driven to move simultaneously, so that a finger contacting with the touch cover 500 can receive a vibration feedback of a touch.

In one embodiment, referring to fig. 5a and 5d, the touch cover 500 is connected to the movable element 300 through a glue 400.

In other embodiments, the touch cover 500 and the movable member 300 can be of a unitary structure, i.e., the entirety of the touch cover 500 and the movable member 300 can also be collectively referred to as a movable member.

In one embodiment, referring to fig. 5b and 5c, the adhesive member includes a first adhesive member 410 and a second adhesive member 420, the first adhesive member 410 is connected to the movable member 300 and the touch cover 500, and the second adhesive member 420 is connected to the fixed member 200 and used for being connected to a housing of the electronic device. The specific structure of the first adhesive member 410 is not limited, for example, the first adhesive member 410 includes a plurality of strip structures distributed at different positions of the movable member 300, or the first adhesive member 410 is a whole layered structure covering the whole surface of the movable member 300. The structure of the second glue joint 420 can also refer to the arrangement of the first glue joint 410, and is not described in detail. By providing the adhesive member 400, the connection between the touch cover 500, the pressure sensing member 700, and the movable member 300 is more stable.

Referring to fig. 5c, when the fixing element 200 is in the shape of an annular frame, the first adhesive member 410 connects the movable element and the touch cover 500 in the first accommodating space, and the second adhesive member 420 connects a side of the annular frame-shaped fixing element facing away from the touch cover 500.

Referring to fig. 5d, when the movable element 300 is in the shape of an annular frame, the first adhesive member 410 is connected to the annular frame structure and the touch cover 500, and the second adhesive member 420 is connected to a side of the fixing member in the second accommodating space, which faces away from the touch cover 500.

Referring to fig. 5e and 5f, and fig. 5g and 5h, the technical solution is similar when the number of the haptic feedback units 100 is 1, that is, the adhesive member 400 connects the movable member 300 and the touch cover 500.

In one embodiment, referring to fig. 5a, 5e, 5g, 5i and 5j, the shape of the moveable member 300 and the stationary member 200 can have a correspondence, i.e., the moveable member 300 and the stationary member 200 are matched in shape and in an identical, complementary, parallel, etc. relationship.

Specifically, fig. 5a and 5e show that the shape of the movable member 300 is substantially the same as that of the stationary member 200; FIG. 5g illustrates the shape of the moveable member 300 and the stationary member 200 being substantially identical and parallel to each other; figures 5i and 5j show that the shape of the moveable member 300 is complementary to the shape of the stationary member 200, with the separation distances being approximately the same throughout.

In one embodiment, referring to fig. 6a, the tactile feedback device further includes a control element (not shown) and a pressure sensing element 700, the control element is electrically connected to the tactile feedback unit 100 and the pressure sensing element 700, the pressure sensing element 700 is disposed on a side of the fixed element 200 or the movable element 300 facing the touch cover 500 for sensing a pressure of the touch cover 500 and transmitting a pressure electrical signal to the control element, the control element outputs a driving voltage signal to the tactile feedback unit 100 according to the pressure electrical signal, and the tactile feedback unit 100 receives the driving voltage signal and generates an elastic deformation so that the movable element 300 vibrates relative to the fixed element 200 to drive the touch cover 500 to vibrate.

In this embodiment, the pressure sensing member 700 may be a piezoelectric structure such as a piezoelectric ceramic, and the pressure sensing member 700 is used for sensing the pressure applied to the touch cover 500, and the pressure applied to the touch cover 500 is generally applied by a finger of a person.

In this embodiment, the pressure sensor 700 is arranged to sense the pressure of the touch cover 500, so that the slight pressure and pressure change of the touch cover 500 can be sensed more accurately, and the tactile feedback unit 100 (or the first tactile feedback unit 110 and the second tactile feedback unit 120) can perform more accurate tactile feedback.

In one embodiment, the number of the pressure sensing members 700 may be plural, and the plural pressure sensing members 700 are uniformly distributed on the stationary member 200 or the movable member 300. As shown in fig. 6a, the number of the pressure-sensitive members 700 is 4, and they are uniformly distributed around the fixing member 200. In other embodiments, the number of the pressure sensing members 700 may be other. The plurality of pressure sensing members 700 can sense pressure at different positions, thereby facilitating different haptic feedback effects.

In other embodiments, the pressure sensing member 700 may not be provided, and the pressure of the touch cover 500 may be sensed by the piezoelectric element 10 of the haptic feedback unit 100.

In one embodiment, referring to fig. 6a, the pressure sensing member 700 is disposed on the moving member 300, and the adhesive member 400 is connected to the pressure sensing member 700 and the touch cover 500. The pressure of the touch cover 500 is transmitted to the pressure sensing member 700 through the adhesive member 400.

In one embodiment, referring to fig. 6b, the first adhesive member 410 is disposed on the movable member 300, the first adhesive member 410 is connected to the pressure sensing member 700 and the movable member 200, and the second adhesive member 420 is connected to a side of the fixed member 200 opposite to the touch cover 500. The pressure of the touch cover 500 is directly transmitted to the pressure sensing member 700.

In one embodiment, referring to fig. 6c, the pressure sensing element 700 is disposed on the fixing element 200, the first adhesive 410 connects the movable element and the touch cover 500, and the second adhesive 420 connects to a side of the fixing element 200 opposite to the touch cover 500. The pressure of the touch cover 200 is directly transmitted to the pressure sensing member 700.

In one embodiment, referring to fig. 1c and fig. 7a, the control element is electrically connected to both the first haptic feedback unit 110 and the second haptic feedback unit 120, and the driving voltage signals output by the control element to the first haptic feedback unit 110 and the second haptic feedback unit 120 are opposite, so that the first haptic feedback unit 110 and the second haptic feedback unit 120 are deformed in opposite directions to drive the movable member 300 to move in the same direction.

Specifically, referring to fig. 1a and fig. 1c, the moveable element 300 is described as moving from the position T1 to the position T2 shown in fig. 1c relative to the stationary element 200. When the control element outputs opposite driving voltage signals to the first haptic feedback unit 110 and the second haptic feedback unit 120, the piezoelectric element 10 of the first haptic feedback unit 110 extends (see the arrow in the first haptic feedback unit 110 in fig. 1 c), and drives the first elastic piece 21 and the second elastic piece 22 of the first haptic feedback unit 110 to deform, so as to pull the movable element 300 to move toward the left side of the fixed element 200 (see the arrow in the movable element 300 in fig. 1 c). Meanwhile, since the driving voltage signals of the second haptic feedback unit 120 are opposite, the piezoelectric element 10 of the second haptic feedback unit 120 is shortened (the direction is shown by the arrow in the second haptic feedback unit 120 in fig. 1 c), and the first elastic piece 21 and the second elastic piece 22 of the second haptic feedback unit 120 are deformed, so as to push the movable member 300 to move toward the left side of the fixed member 200 (the direction is shown by the arrow in the movable member 300 in fig. 1 c).

Therefore, the control member is arranged to provide opposite driving voltage signals to the two tactile feedback units, so that a larger driving force can be provided to the movable member 300, the tactile feedback of the tactile feedback device is more remarkable, the tactile feedback units are arranged on both sides of the movable member 300, and the whole structure is more stable.

When the moving direction of the moving member 300 needs to be changed, the direction of the output voltage signal of the control member is adjusted. In addition, when the speed of the movement of the movable member 300 and the speed of the direction change need to be changed, the magnitude and the frequency of the output voltage signal of the control member can be adjusted.

In one embodiment, referring to fig. 7a and 7c, the haptic feedback device further includes a connection lead, and the control member includes a signal output terminal 610 and a ground terminal 620.

The connection leads include a first lead 610, a second lead 612, a third lead 621, and a fourth lead 622. The first lead 611 connects the signal output terminal 610 and the positive electrode connection part of the first haptic feedback unit 110, the second lead 612 connects the signal output terminal 610 and the negative electrode connection part of the second haptic feedback unit 120, the third lead 621 connects the ground terminal 620 and the negative electrode connection part of the first haptic feedback unit 110, and the fourth lead 622 connects the ground terminal 620 and the positive electrode connection part of the second haptic feedback unit 120.

In this embodiment, four lead lines of the first lead line 611 to the fourth lead line 622 are connected in parallel to the first haptic feedback unit 110 and the second haptic feedback unit 120. And the control part is connected with the two tactile feedback units in parallel, so that opposite driving voltage signals are output to the two tactile feedback units.

In one embodiment, referring to fig. 7b, the connecting leads include a fifth lead 613, a sixth lead 614 and a seventh lead 623, the fifth lead 613 connects the signal output terminal 610 and the positive electrode connecting portion of the first haptic feedback unit 110, the sixth lead 614 connects the negative electrode connecting portion of the first haptic feedback unit 110 and the negative electrode connecting portion of the second haptic feedback unit 120, and the seventh lead 623 connects the positive electrode connecting portion of the second haptic feedback unit 120 and the ground terminal 620.

In this embodiment, three leads from the fifth lead 613 to the seventh lead 623 are connected in series with the first haptic feedback unit 110 and the second haptic feedback unit 120. The control part is connected with the two tactile feedback units in series, so that opposite driving voltage signals are output to the two tactile feedback units.

Referring to fig. 7a and 7b, when a finger presses the touch cover 500, the touch cover 500 transmits pressure to the pressure sensing element 700 (see fig. 6a to 6 c), or the touch cover 500 transmits pressure to the first haptic feedback unit 110 and/or the second haptic feedback unit 120, the pressure sensing element 700, the first haptic feedback unit 110 and/or the second haptic feedback unit 120 sense the pressure of the touch cover 500 and transmit an electrical signal of the pressure to the control element, the control element receives the electrical signal of the pressure and outputs a driving voltage signal, and the driving voltage signal is transmitted to the first haptic feedback unit 110 and the second haptic feedback unit 120 in a parallel or serial manner, so that the purpose that the first haptic feedback unit 110 and the second haptic feedback unit 120 drive the movable element 300 to move in the same direction is achieved.

In fig. 7b and 7c, the moving direction of the touch cover 500 follows the moving direction of the movable member 300, and the arrow on one side of the touch cover 500 in fig. 7b and 7c shows that the moving direction is a transverse direction. The arrows in the first and second

haptic feedback units

110 and 120 in fig. 7b and 7c show the flowing direction of the internal current.

Referring to fig. 8a to 8e, an embodiment of the invention further provides an electronic device including the haptic feedback device according to the embodiment of the invention.

In an embodiment, referring to fig. 8a, the electronic device is a notebook computer, and the tactile feedback device can be disposed at the display screen and the touch pad, and when a finger touches the display screen or the touch pad, the tactile feedback device can generate a vibration feedback (the vibration direction is shown by an arrow in fig. 8 a), so that the finger feels the tactile feedback.

In an embodiment, referring to fig. 8b and 8c, the electronic device is a smart phone, and the tactile feedback device is disposed at a display screen of the smart phone, and when a finger touches the display screen, the tactile feedback device can generate a vibration feedback, so that the finger feels the tactile feedback. Fig. 8b shows the way the haptic feedback device is arranged longitudinally, the vibration direction also being longitudinal (indicated by the arrow in fig. 8 b). Fig. 8c shows the manner in which three haptic feedback devices are arranged laterally side by side, with the direction of vibration being lateral (indicated by the arrows in fig. 8 c).

In one embodiment, referring to fig. 8d, the electronic device is a control panel of an automobile, and the tactile feedback device is disposed at a display screen of the control panel of the automobile, and when a finger touches the display screen, the tactile feedback device can generate a vibration feedback (the vibration direction is shown by an arrow in fig. 8 d), so that the finger can feel the tactile feedback.

In one embodiment, referring to fig. 8e, the electronic device is a smart watch, and the tactile feedback device is disposed at a display screen of the smart watch, and when a finger touches the display screen, the tactile feedback device can generate a vibration feedback (the vibration direction is shown by an arrow in fig. 8 e), so that the finger can feel the tactile feedback.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A tactile feedback unit is characterized by comprising a piezoelectric element, a first elastic sheet and a second elastic sheet, wherein the piezoelectric element comprises a first surface and a second surface which are parallel to and opposite to each other, and a first side surface and a second side surface which are parallel to and opposite to each other, the vertical distance from the first surface to the second surface is a first distance, the vertical distance from the first side surface to the second side surface is a second distance, the first distance is smaller than the second distance, the first elastic sheet is connected to the first side surface, the second elastic sheet is connected to the second side surface, one side of the first elastic sheet, which is opposite to the first side surface, is used for being connected to a fixed piece, and one side of the second elastic sheet, which is opposite to the second side surface, is used for being connected to a movable piece; the piezoelectric element is used for receiving a driving voltage signal to deform so as to drive the first elastic sheet and the second elastic sheet to elastically deform, so that the moving part generates displacement relative to the fixing part.

2. A haptic feedback unit as recited in claim 1 wherein said piezoelectric element extends in a first direction and has a first axis of symmetry in said first direction, a line connecting a midpoint of said first side to a midpoint of said second side being a second axis of symmetry, said first spring plate and said second spring plate being symmetrical with respect to both said first axis of symmetry and said second axis of symmetry.

3. A haptic feedback unit as recited in claim 2 wherein said first resilient plate includes a first connection portion, a first extension portion, a second connection portion, a second extension portion and a third connection portion connected in sequence, said first connection portion and said third connection portion are respectively connected to two ends of said first side surface along said first direction, said second connection portion has a distance from said first side surface, said second axis of symmetry passes through a center of said second connection portion, said second connection portion is used for connecting with said fixed member, said piezoelectric element generates a stretching deformation along said first direction, and said piezoelectric element drives said first extension portion and said second extension portion to elastically deform.

4. A haptic feedback unit according to any one of claims 1 to 3, further comprising a flexible circuit board including a positive electrode connection portion and a negative electrode connection portion, wherein the piezoelectric element includes a positive electrode connection portion and a negative electrode connection portion, the positive electrode connection portion and the positive electrode connection portion being connected, and the negative electrode connection portion being connected; the positive electrode connecting part and the negative electrode connecting part are arranged on the first surface, and an insulating part is arranged between the positive electrode connecting part and the negative electrode connecting part.

5. A haptic feedback unit as recited in claim 4 wherein said positive electrode connection and said negative electrode connection are located at a same end of said first surface along a direction of extension of said piezoelectric element.

6. A haptic feedback unit as recited in claim 4 further comprising a protective layer disposed on said first surface and extending to said first side and said second side to cover a connection location of said piezoelectric element to said first resilient plate and said second resilient plate.

7. A haptic feedback device comprising a stationary member, a movable member, and a haptic feedback unit according to any one of claims 1 to 6, the haptic feedback unit being connected between the stationary member and the movable member.

8. A haptic feedback device as recited in claim 7 wherein said stationary member has a ring frame shape and encloses a first receiving space, two haptic feedback units are provided, two haptic feedback units and said movable member are received in said first receiving space, and one haptic feedback unit is provided on each of opposite sides of said movable member.

9. A haptic feedback device as recited in claim 7 wherein said movable member is shaped as an annular frame and encloses a second receiving space, said haptic feedback units are two in number, two of said haptic feedback units and said fixed member are received in said second receiving space, and one of said haptic feedback units is disposed on each of opposite sides of said fixed member.

10. An electronic device characterized by comprising a haptic feedback device according to any one of claims 7 to 9.