Pressure detection and vibration module and driving method

Abstract

The application relates to the technical field of touch feedback, in particular to a pressure detection and vibration module and a driving method, which comprises the following: a substrate, comprising a mounting surface and a supporting surface opposite to the mounting surface; a force transmission plate, arranged on the supporting surface of the substrate, and one end of the force transmission plate is rotationally connected with the supporting surface, and the force transmission plate is provided with a first fulcrum and a second fulcrum; a first piezoelectric ceramic, fixed on the supporting surface and in contact with the second fulcrum, so that when a touch point is stressed, the displacement of the first piezoelectric ceramic is amplified through the force transmission plate; a second piezoelectric ceramic, fixed on the supporting surface and in contact with the first fulcrum, used for providing vibration touch feeling; wherein the layer number of the first piezoelectric ceramic is less than that of the second piezoelectric ceramic, so as to expand the amplitude of vibration through the force transmission plate. Through the above arrangement, the pressure can be more easily detected, and the arrangement that the layer number of the second piezoelectric ceramic at the first fulcrum is increased can provide stronger vibration feeling.

Description

Technical Field

[0001] This invention relates to the field of touch feedback technology, and in particular to a pressure detection and vibration module and driving method. Background Technology

[0002] Because piezoelectric ceramics have positive and negative piezoelectric effects, meaning they can generate electrical signals when subjected to force and undergo mechanical deformation when an electrical signal is applied, they are widely used in various pressure detection and tactile feedback systems.

[0003] In existing technologies, a common approach is to integrate piezoelectric ceramics onto the surface of a device. Pressure signals are collected by the user's pressure and combined with driving electrical signals to generate corresponding vibrations, thus providing tactile feedback. However, in some special cases, such as waterproof products or products with a focus on aesthetics, the product surface cannot have openings and there are certain requirements for product wall thickness. In these situations, the deformation of the product is very small when the touch pressure is low, typically only a few tens of micrometers. This results in insufficient pressure detection and poor vibration response.

[0004] To address the aforementioned issues, related technologies employ single-layer piezoelectric ceramics at the pressure contact point to detect pressure. However, while single-layer ceramics can barely detect pressure, their vibration effect is poor, and users may not even feel the vibration. Although multi-layer piezoelectric ceramics provide better vibration feedback, their larger capacitance can prevent the detection of pressing pressure. Therefore, balancing the sensitivity of pressure detection with the intensity of vibration feedback has become a pressing problem. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present invention provides a pressure detection and vibration module and driving method, which adopts structural improvements to improve the sensitivity of pressure detection and the intensity of vibration sensing.

[0006] According to a first aspect of the present invention, a pressure detection and vibration module is provided, comprising:

[0007] The substrate includes a mounting surface and a support surface on the side opposite to the mounting surface;

[0008] A force transmission plate is placed on the support surface of the substrate, and one end of the force transmission plate is rotatably connected to the support surface. A first fulcrum and a second fulcrum are arranged sequentially from the direction close to the rotatable connection end on the force transmission plate. Both the first fulcrum and the second fulcrum protrude towards the support surface. The first fulcrum also protrudes in the direction away from the support surface to form a contact point.

[0009] The first piezoelectric ceramic is fixed on the support surface and in contact with the second fulcrum, so that when the contact is subjected to force, the displacement of the first piezoelectric ceramic is amplified through the force transmission plate;

[0010] A second piezoelectric ceramic is fixed to the support surface and in contact with the first fulcrum to provide a vibratory tactile sensation;

[0011] The first piezoelectric ceramic layer has fewer layers than the second piezoelectric ceramic layer, so as to amplify the vibration amplitude through the force transmission plate.

[0012] Furthermore, the support surface has a rotating connecting seat, and the end of the force transmission plate has a rotating shaft that is rotatably connected in the rotating connecting seat, the rotating shaft being parallel to the width direction of the force transmission plate.

[0013] Furthermore, both the first fulcrum and the second fulcrum are perpendicular to the force transmission plate, the first piezoelectric ceramic is away from the rotating connecting seat, the second piezoelectric ceramic is close to the connecting seat, and the deformation direction of the first piezoelectric ceramic and the vibration direction of the second piezoelectric ceramic are both perpendicular to the support surface.

[0014] Furthermore, the first piezoelectric ceramic has a single-layer structure.

[0015] Furthermore, the first piezoelectric ceramic includes a substrate, a single-layer piezoelectric sheet fixed at the center of the substrate, and an annular adhesive attached to the side of the substrate opposite to the single-layer piezoelectric sheet. The annular adhesive is fixedly connected to the edge of the substrate to form a space for deformation of the single-layer piezoelectric sheet and the substrate.

[0016] Furthermore, the first piezoelectric ceramic also includes an FPC, an annular conductive tape, and a central conductive tape. The annular conductive tape is fixed to the periphery of the single-layer piezoelectric sheet, and the central conductive tape is fixed to the center of the single-layer piezoelectric sheet. The FPC covers the single-layer piezoelectric sheet and is bonded and connected to the central conductive tape and the annular conductive tape.

[0017] Furthermore, the first piezoelectric ceramic also has an adhesive pad, which is fixed to the center of the FPC on the side opposite to the single-layer piezoelectric sheet, and the adhesive pad is bonded to the second fulcrum.

[0018] Furthermore, the adhesive pad is pre-compressed by 30% to 50% in the thickness direction.

[0019] Furthermore, the second piezoelectric ceramic includes a multilayer piezoelectric sheet and metal cymbals connected to both sides of the multilayer piezoelectric sheet in the thickness direction. One of the metal cymbals is fixed to the support surface, and the other metal cymbal is fixed to the second fulcrum. The contraction of the multilayer piezoelectric sheet causes the two metal cymbals to vibrate in a direction perpendicular to the multilayer piezoelectric sheet.

[0020] According to a second aspect of the present invention, a driving method for the above-mentioned pressure detection and vibration module is also provided, comprising the following steps:

[0021] Collect voltage information from the first piezoelectric ceramic;

[0022] The collected voltage information is filtered, and the filtered voltage information is amplified.

[0023] The system detects whether the amplified voltage information reaches a set threshold. If it does, it drives the second piezoelectric ceramic to vibrate.

[0024] The beneficial effects of this invention are as follows: By rotating one end of the force transmission plate on the support surface of the substrate, the displacement of the contact point is amplified by the second fulcrum at the far end of the force transmission plate when the contact point is pressed. This results in a larger deformation of the first piezoelectric ceramic in contact with the second fulcrum, making the pressure easier to detect. By increasing the number of layers of the second piezoelectric ceramic at the first fulcrum, the second piezoelectric ceramic provides a stronger vibration. Compared with the prior art, this improves the sensitivity of pressure detection and the intensity of vibration in micro-displacement scenarios. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the pressure detection and vibration module in an embodiment of the present invention;

[0027] Figure 2 As described in the embodiments of the present invention Figure 1 Schematic diagram of the AA-direction cross-section structure;

[0028] Figure 3 As described in the embodiments of the present invention Figure 1 A magnified schematic diagram of the structure at point B in the diagram;

[0029] Figure 4 This is a cross-sectional structural schematic diagram of the first piezoelectric ceramic in an embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional view of the second piezoelectric ceramic in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the application structure of the pressure detection and vibration module in an embodiment of the present invention;

[0032] Figure 7 This is a flowchart illustrating the steps of the pressure detection and vibration module driving method in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Substrate; 11. Mounting surface; 12. Support surface; 121. Rotating connecting seat; 2. Force transmission plate; 21. First fulcrum; 22. Second fulcrum; 23. Rotating shaft; 3. First piezoelectric ceramic; 31. Substrate; 32. Single-layer piezoelectric sheet; 33. Annular adhesive; 34. Annular conductive adhesive tape; 35. Central conductive adhesive tape; 36. FPC; 37. Adhesive pad; 4. Second piezoelectric ceramic; 41. Multilayer piezoelectric sheet; 42. Metal cymbal sheet; 5. Panel. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] like Figures 1 to 6 The pressure detection and vibration module shown includes a base plate 1, a force transmission plate 2, a first piezoelectric ceramic 3, and a second piezoelectric ceramic 4. Please refer to [reference needed] for details. Figure 1 and Figure 2In an embodiment of the present invention, the substrate 1 includes a mounting surface 11 and a support surface 12 on the side opposite to the mounting surface 11. The mounting surface 11 is used to connect and fix with the product. Various fixing methods are available, such as bonding, snap-fitting, or screwing. A force transmission plate 2 is placed on the support surface 12 of the substrate 1, and one end of the force transmission plate 2 is rotatably connected to the support surface 12. A first fulcrum 21 and a second fulcrum 22 are sequentially arranged on the force transmission plate 2 from near to far from the rotatable connection end. Both the first fulcrum 21 and the second fulcrum 22 protrude towards the support surface 12. The first fulcrum 21 also protrudes in the direction away from the support surface 12 to form a contact point. In an embodiment of the present invention, such as... Figure 2 As shown, the second fulcrum 22 is located at the end of the force transmission plate 2 furthest from the rotating connection end, and the first fulcrum 21 is located between the rotating connection point and the second fulcrum 22. This structural configuration creates an amplified mechanical displacement structure, as shown below. Figure 2 As shown, the distance between the first fulcrum 21 and the rotation connection point is L1, and the distance between the first fulcrum 21 and the second fulcrum 22 is L2. When a force F1 is applied at the contact point, the displacement of the contact point is S1. Then the displacement at the second fulcrum 22 is S2 = S1 × (L1 + L2) / L1. Compared with S1, the displacement of S2 is increased by (L1 + L2) / L1 times, which increases the displacement compared with the existing direct pressing method.

[0038] Please continue to refer to Figure 1 and Figure 2 In an embodiment of the present invention, the first piezoelectric ceramic 3 is fixed on the support surface 12 and contacts the second fulcrum 22, so that when the contact point is subjected to force, the displacement of the first piezoelectric ceramic 3 is amplified by the force transmission plate 2; as described above, by means of the structure in which one end of the force transmission plate 2 is rotatably connected, the displacement at the second fulcrum 22 is amplified by (L1+L2) / L1 times, thereby making it easier to detect pressure; the second piezoelectric ceramic 4 is fixed on the support surface 12 and contacts the first fulcrum 21, and is used to provide a vibrational tactile sensation; in an embodiment of the present invention, as Figure 2 As shown, the distance between the protrusions of the first fulcrum 21 and the second fulcrum 22 is less than the distance between the protrusions of the second fulcrum 22. Correspondingly, the number of layers of the first piezoelectric ceramic 3 is less than the number of layers of the second piezoelectric ceramic 4, so as to amplify the vibration amplitude through the force transmission plate 2. With this structural configuration, on the one hand, the deformation of the first piezoelectric ceramic 3 can be increased by increasing the displacement of the second fulcrum 22; on the other hand, the vibration sensation can be improved by increasing the number of layers of the second piezoelectric ceramic 4 at the first fulcrum 21. Through the above structural configuration, both pressure detection and vibration sensation enhancement are achieved.

[0039] In the above embodiment, by rotating one end of the force plate 2 on the support surface 12 of the substrate 1, the displacement of the contact point is amplified by the second fulcrum 22 at the far end of the force plate 2 when the contact point is pressed. This results in a larger deformation of the first piezoelectric ceramic 3 in contact with the second fulcrum 22, making the pressure easier to detect. By increasing the number of layers of the second piezoelectric ceramic 4 at the first fulcrum 21, the second piezoelectric ceramic 4 provides a stronger vibration. Compared with the prior art, this improves the sensitivity of pressure detection and the intensity of vibration.

[0040] In some embodiments of the present invention, the specific structural form of the rotational connection is as follows: Figure 3 As shown, the support surface 12 has a rotating connecting seat 121, and the end of the force transmission plate 2 has a rotating shaft 23 rotatably connected within the rotating connecting seat 121. The rotating shaft 23 is parallel to the width direction of the force transmission plate 2. The rotating connecting seat 121 can be adopted as follows: Figure 3 The open arc-shaped groove shown allows the rotating shaft 23 to be pressed into the arc-shaped groove. By setting the rotating shaft 23 parallel to the width direction, the rotating shaft 23 can swing in the length direction.

[0041] In an embodiment of the present invention, both the first fulcrum 21 and the second fulcrum 22 are perpendicular to the force transmission plate 2. The first piezoelectric ceramic 3 is away from the rotating connecting seat 121, and the second piezoelectric ceramic 4 is close to the connecting seat. The deformation direction of the first piezoelectric ceramic 3 and the vibration direction of the second piezoelectric ceramic 4 are both perpendicular to the support surface 12. Here, the deformation direction of the first piezoelectric ceramic 3 refers to the deformation achieved under the compression of the second fulcrum 22. The center positions of the first fulcrum 21 and the second piezoelectric ceramic 4 correspond, and the center position of the second fulcrum 22 corresponds to the center position of the first piezoelectric ceramic 3.

[0042] In an embodiment of the present invention, in order to obtain a larger electrical signal, the first piezoelectric ceramic 3 is a single-layer structure. Please refer to [reference needed] for details. Figure 4 The first piezoelectric ceramic 3 includes a substrate 31, a single-layer piezoelectric sheet 32 ​​fixed at the center of the substrate 31, and an annular adhesive 33 adhered to the side of the substrate 31 opposite to the single-layer piezoelectric sheet 32. The annular adhesive 33 is fixedly connected to the edge of the substrate 31 to form a space for deformation of the single-layer piezoelectric sheet 32 ​​and the substrate 31. In embodiments of the present invention, the thickness of the annular adhesive 33 is 0.15~0.2mm. By setting the annular adhesive 33, the substrate 31 is fixed to the support surface 12 on the one hand, and the space for deformation of the single-layer piezoelectric sheet 32 ​​and the substrate 31 on the other hand.

[0043] Please continue to refer to Figure 4In an embodiment of the present invention, the first piezoelectric ceramic 3 further includes an FPC 36, an annular conductive adhesive tape 34, and a central conductive adhesive tape 35. The annular conductive adhesive tape 34 is fixed to the periphery of the single-layer piezoelectric sheet 32, and the central conductive adhesive tape 35 is fixed to the center of the single-layer piezoelectric sheet 32. The FPC 36 covers the single-layer piezoelectric sheet 32 ​​and is bonded and connected to the central conductive adhesive tape 35 and the annular conductive adhesive tape 34. The FPC 36 is a flexible circuit board. Through the arrangement of the central conductive adhesive tape 35 and the annular conductive adhesive tape 34, the FPC 36 can deform together with the single-layer piezoelectric sheet 32, and at the same time, it can also realize the transmission of electrical signals.

[0044] In an embodiment of the present invention, the first piezoelectric ceramic 3 also has an adhesive pad 37, which is fixed to the center of the FPC 36 on the side opposite to the single-layer piezoelectric sheet 32, and is bonded to the second support point 22. Furthermore, the adhesive pad 37 is pre-compressed by 30% to 50% in the thickness direction. This pre-compression of the adhesive pad 37 ensures reliable connection with the second support point 22, and also reduces noise during vibration.

[0045] In an embodiment of the present invention, the structure of the second piezoelectric ceramic 4 is as follows: Figure 5 As shown, the second piezoelectric ceramic 4 includes a multilayer piezoelectric sheet 41 and metal cymbals 42 connected to both sides of the multilayer piezoelectric sheet 41 in the thickness direction. One metal cymbal 42 is fixed to the support surface 12, and the other metal cymbal 42 is fixed to the second fulcrum 22. The contraction of the multilayer piezoelectric sheet 41 causes the two metal cymbals 42 to vibrate in a direction perpendicular to the multilayer piezoelectric sheet 41. It should be noted that by setting the two metal cymbals 42, the displacement of the multilayer piezoelectric sheet 41 in the X direction is converted into the displacement in the Z direction, and the two metal cymbals 42 symmetrically arranged on the multilayer piezoelectric sheet 41 can amplify the displacement. In specific fixing, the metal cymbals 42 on both sides can be bonded together with an adhesive thickness of about 0.1 mm and high hardness to achieve better force transmission. In specific applications, such as... Figure 6 As shown, panel 5 is connected to the pressure detection and vibration module, so that panel 5 contacts the contact point corresponding to the first fulcrum 21. It should also be noted that the material of panel 5 can be glass or plastic, and the rigidity of substrate 1 should be greater than that of panel 5. With this structural setting, when the second piezoelectric ceramic 4 vibrates, under the action of force transmission plate 2, panel 5 will have a relatively large upward displacement relative to substrate 1, thereby making the vibration felt by the user stronger.

[0046] In an embodiment of the present invention, a driving method for the above-mentioned pressure detection and vibration module is also provided, such as... Figure 7 As shown, the steps include:

[0047] S10: Collect voltage information of the first piezoelectric ceramic 3; through the structure of the pressure detection and vibration module, the displacement of the first piezoelectric ceramic 3 increases significantly after the panel 5 is touched, under the action of the second fulcrum 22.

[0048] S20: Filter the collected voltage information and amplify the filtered voltage information; it should be noted that voltage amplification and filtering are existing technologies in this field, and will not be described in detail here. By using signal amplification and filtering circuits, messy signals can be filtered out, leaving the amplified electrical signal. Through the action of electrical signal and mechanical displacement, the voltage detection accuracy is further improved.

[0049] S30: Detect whether the amplified voltage information reaches a set threshold. If it does, drive the second piezoelectric ceramic 4 to vibrate. After obtaining the amplified signal, drive the multilayer piezoelectric ceramic according to the set threshold. It should be noted that the pressure detection and vibration module in this embodiment of the invention can be applied to vehicle door handles, automotive interior panel buttons, and various touch electronic devices.

[0050] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pressure detection and vibration module, characterized in that, include: The substrate includes a mounting surface and a support surface on the side opposite to the mounting surface; A force transmission plate is placed on the support surface of the substrate, and one end of the force transmission plate is rotatably connected to the support surface. A first fulcrum and a second fulcrum are arranged sequentially from the direction close to the rotatable connection end on the force transmission plate. Both the first fulcrum and the second fulcrum protrude towards the support surface. The first fulcrum also protrudes in the direction away from the support surface to form a contact point. The first piezoelectric ceramic is fixed on the support surface and in contact with the second fulcrum, so that when the contact is subjected to force, the displacement of the first piezoelectric ceramic is amplified through the force transmission plate; A second piezoelectric ceramic is fixed to the support surface and in contact with the first fulcrum to provide a vibratory tactile sensation; The first piezoelectric ceramic layer has fewer layers than the second piezoelectric ceramic layer, so as to amplify the vibration amplitude through the force transmission plate.

2. The pressure detection and vibration module according to claim 1, characterized in that, The support surface has a rotating connecting seat, and the end of the force transmission plate has a rotating shaft that is rotatably connected in the rotating connecting seat. The rotating shaft is parallel to the width direction of the force transmission plate.

3. The pressure detection and vibration module according to claim 2, characterized in that, The first fulcrum and the second fulcrum are both perpendicular to the force transmission plate. The first piezoelectric ceramic is away from the rotating connecting seat, and the second piezoelectric ceramic is close to the connecting seat. The deformation direction of the first piezoelectric ceramic and the vibration direction of the second piezoelectric ceramic are both perpendicular to the support surface.

4. The pressure detection and vibration module according to claim 1, characterized in that, The first piezoelectric ceramic has a single-layer structure.

5. The pressure detection and vibration module according to claim 4, characterized in that, The first piezoelectric ceramic includes a substrate, a single-layer piezoelectric sheet fixed at the center of the substrate, and an annular adhesive attached to the side of the substrate away from the single-layer piezoelectric sheet. The annular adhesive is fixedly connected to the edge of the substrate to form a space for deformation of the single-layer piezoelectric sheet and the substrate.

6. The pressure detection and vibration module according to claim 5, characterized in that, The first piezoelectric ceramic further includes an FPC, an annular conductive tape, and a central conductive tape. The annular conductive tape is fixed to the periphery of the single-layer piezoelectric sheet, and the central conductive tape is fixed to the center of the single-layer piezoelectric sheet. The FPC covers the single-layer piezoelectric sheet and is bonded and connected to the central conductive tape and the annular conductive tape.

7. The pressure detection and vibration module according to claim 6, characterized in that, The first piezoelectric ceramic also has an adhesive pad, which is fixed to the center of the FPC on the side opposite to the single-layer piezoelectric sheet, and the adhesive pad is bonded to the second fulcrum.

8. The pressure detection and vibration module according to claim 7, characterized in that, The rubber pad is pre-compressed by 30% to 50% in the thickness direction.

9. The pressure detection and vibration module according to claim 1, characterized in that, The second piezoelectric ceramic includes a multilayer piezoelectric sheet and metal cymbals connected to both sides of the multilayer piezoelectric sheet in the thickness direction. One of the metal cymbals is fixed to the support surface, and the other metal cymbal is fixed to the second fulcrum. The contraction of the multilayer piezoelectric sheet causes the two metal cymbals to vibrate in a direction perpendicular to the multilayer piezoelectric sheet.

10. A pressure detection and vibration module driving method as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Collect voltage information from the first piezoelectric ceramic; The collected voltage information is filtered, and the filtered voltage information is amplified. The system detects whether the amplified voltage information reaches a set threshold. If it does, it drives the second piezoelectric ceramic to vibrate.

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