Piezoelectric vibration motor and electronic device

Abstract

The utility model discloses a piezoelectric vibration motor and an electronic device, the piezoelectric vibration motor comprises a base and a vibrator, the vibrator comprises two vibration units arranged at an interval, each vibration unit comprises a mass block, an elastic component and a piezoelectric ceramic piece, and the mass block is movably connected with the base through the elastic component; the piezoelectric ceramic piece is arranged on the mass block or the elastic component and drives the mass block to vibrate relative to the base. According to the technical scheme, the internal friction of the piezoelectric motor is reduced, and the vibration effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, and in particular to a piezoelectric vibration motor and electronic device. Background Technology

[0002] Piezoelectric motors are widely used in electronic devices such as mobile phones, watches, and game controllers due to their advantages of flexible size design, short response time, and high energy efficiency. They are used to generate vibrations in these devices, facilitating information interaction between the devices and users through vibration feedback. However, piezoelectric motors in related technologies typically contain only a single mass block with piezoelectric ceramic plates on opposite sides. When the two ceramic plates operate independently, a phase difference can easily occur, causing internal friction and resulting in energy loss, thus affecting the motor's vibration performance. Utility Model Content

[0003] The main purpose of this invention is to provide a piezoelectric vibration motor that aims to reduce the internal losses of the piezoelectric vibration motor and improve its vibration effect.

[0004] To achieve the above objectives, the present invention proposes a piezoelectric vibration motor, comprising a base and an oscillator, wherein the oscillator comprises two spaced-apart vibration units, and the vibration unit comprises:

[0005] Mass block;

[0006] An elastic component is provided, through which the mass block is movably connected to the base;

[0007] A piezoelectric ceramic sheet is disposed on the mass block or the elastic component, and drives the mass block to vibrate relative to the base.

[0008] In one embodiment of the present invention, the piezoelectric ceramic sheets in the two vibration units are both disposed on the elastic component, and the two piezoelectric ceramic sheets are arranged opposite to each other.

[0009] In one embodiment of the present invention, a buffer material is filled between the two vibration units.

[0010] In one embodiment of this utility model, the elastic component includes:

[0011] The first spring and the second spring are fixedly connected at one end to the base, and at the other end of the first spring and the other end of the second spring are fixed to different sides of the mass block.

[0012] In one embodiment of the present invention, the base includes a base plate, and a first fixing ear and a second fixing ear are protruding from two opposite sides of the base plate, the first fixing ear and the second fixing ear being spaced apart;

[0013] The two vibration units are symmetrically distributed along the diagonal of the base plate, and the first and second springs are fixedly connected to the first and second fixing ears located on the same side.

[0014] In one embodiment of this utility model, the cross-section of the mass block is triangular;

[0015] The first spring has a first segment, a second segment, and a third segment that are bent and connected in sequence. The first segment is fixedly connected to the first fixing lug. The second segment and the third segment are respectively wrapped around the outer side of the adjacent side of the mass block. The end of the third segment is fixedly connected to the side of the mass block.

[0016] The piezoelectric ceramic sheet is disposed on the second segment.

[0017] In one embodiment of this utility model, the side of the mass block facing the second segment is the longest side, and the two ends of the piezoelectric ceramic sheet extend to the two ends of the second segment.

[0018] In one embodiment of the present invention, one end of the second spring is fixedly connected to the second fixing ear, and the other end of the second spring is fixed to the side of the mass block, and the two ends of the second spring are distributed along a straight line;

[0019] The side on which the mass block is fixed to the second spring is arranged adjacent to the side on which the first spring is fixed.

[0020] In one embodiment of the present invention, the mass block has an avoidance notch formed on the side facing the fixing lug that fixes the second spring.

[0021] This utility model also provides an electronic device, including the piezoelectric vibration motor. The piezoelectric vibration motor includes a base and an oscillator. The oscillator includes two spaced vibration units. The vibration unit includes a mass block, an elastic component, and a piezoelectric ceramic sheet. The mass block is movably connected to the base through the elastic component. The piezoelectric ceramic sheet is disposed on the mass block or the elastic component and drives the mass block to vibrate relative to the base.

[0022] The present invention sets the oscillator in the piezoelectric vibration motor as two spaced vibration units, and the mass block in each vibration unit is driven by a piezoelectric ceramic sheet. In this way, the internal friction caused by the two piezoelectric ceramics acting on the same mass block is avoided, and the energy loss of the oscillator is reduced. At the same time, since each vibration unit works separately, the entire oscillator can obtain double the vibration, thereby improving the vibration of the entire oscillator. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the piezoelectric vibration motor of this utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the medium-voltage electric vibration motor hidden under the cover;

[0026] Figure 3 for Figure 2 Top view in the middle;

[0027] Figure 4 This is a schematic diagram of the base structure in the piezoelectric vibration motor of this utility model;

[0028] Figure 5 This is an exploded view of the structure of the vibration unit in the piezoelectric vibration motor of this utility model;

[0029] Figure 6 This is a simulation diagram of the vibration motor of this utility model.

[0030] Explanation of icon numbers:

[0031] 100. Piezoelectric vibration motor; 11. Base; 111. Base plate; 113. First fixing ear; 115. Second fixing ear; 13. Cover; 20. Vibration unit; 21. Mass block; 211. Clearance notch; 23. First spring; 231. First segment; 233. Second segment; 235. Third segment; 25. Second spring; 27. Piezoelectric ceramic sheet.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators in this embodiment are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This utility model proposes a piezoelectric vibration motor 100.

[0038] Reference Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of an embodiment of the piezoelectric vibration motor 100 of this utility model; Figure 2 for Figure 1 A schematic diagram of the structure after the hidden cover 13 is installed. Figure 3 for Figure 2 Top view of medium-voltage electric vibration motor 100.

[0039] The piezoelectric vibration motor 100 in one embodiment of the present invention includes a base 11 and an oscillator. The oscillator includes two spaced vibration units 20. Each vibration unit 20 includes a mass block 21, an elastic component, and a piezoelectric ceramic sheet 27. The mass block 21 is movably connected to the base 11 through the elastic component. The piezoelectric ceramic sheet 27 is disposed on the mass block 21 or the elastic component and drives the mass block 21 to vibrate relative to the base 11.

[0040] In this embodiment, the base 11 provides a mounting carrier for the oscillator. The shape of the base 11 can be flexibly set according to the structure of the electronic device. A cover 13 is also provided on the base 11. When the cover 13 is placed on the base 11, it can protect the oscillator, making the entire piezoelectric vibration motor 100 a whole, and also facilitating the cooperation of the piezoelectric vibration motor 100 with other components. The technical solution of this utility model sets the oscillator in the piezoelectric vibration motor 100 as two spaced vibration units 20, and the mass block 21 in each vibration unit 20 is driven by a piezoelectric ceramic sheet 27, avoiding the internal friction caused by the two piezoelectric ceramics acting on the same mass block 21, and reducing the energy loss inside the oscillator; at the same time, since each vibration unit 20 in the oscillator works independently, the entire oscillator can obtain double the vibration, improving the vibration of the entire oscillator.

[0041] In this embodiment, the two vibration units 20 are spaced apart, meaning there is a gap between them and they are not connected to each other. It is understood that the two vibration units 20 can be arranged opposite each other, symmetrically, or stacked, etc. The distribution of the two vibration units 20 needs to be comprehensively considered in conjunction with the piezoelectric vibration motor 100 and the electronic equipment. Of course, in one embodiment, to reduce the thickness of the piezoelectric vibration motor 100, the two vibration units 20 can be arranged opposite each other or symmetrically; in another embodiment, the two vibration units 20 can be stacked to reduce the width of the piezoelectric vibration motor 100.

[0042] It should be noted that in this embodiment, the piezoelectric ceramic sheet 27 can be directly fixed to the mass block 21, that is, the piezoelectric ceramic sheet 27 can directly drive the mass block 21 to move; the piezoelectric ceramic sheet 27 can also be fixed by an elastic component, that is, the piezoelectric ceramic sheet 27 can also indirectly drive the mass block 21 to move through an elastic component. The two vibration units 20 have the same vibration direction and vibration frequency, so the two vibration units 20 may also resonate, thereby further improving the vibration effect of the piezoelectric vibration motor 100.

[0043] Please refer to Figure 2 and Figure 3In one embodiment of the present invention, the piezoelectric ceramic sheets 27 in the two vibration units 20 are both disposed on the elastic component, and the two piezoelectric ceramic sheets 27 are arranged opposite to each other.

[0044] In one embodiment of this utility model, by arranging the piezoelectric ceramic plates 27 of the two vibration units 20 in a relative manner, the power connection and wiring design of the two piezoelectric ceramic plates 27 can be facilitated, making the spatial arrangement of the entire piezoelectric vibration motor 100 orderly and reasonable, and improving the convenience of design and assembly.

[0045] Please refer to Figure 2 and Figure 3 In one embodiment of the present invention, a buffer material is filled between the two vibration units 20.

[0046] In one embodiment of the present invention, the piezoelectric ceramic sheet 27 is itself a high-hardness and brittle material. By filling the space between the two vibration units 20 with a buffer material, damage to the piezoelectric ceramic sheet 27 can be avoided by the two vibration units 20 colliding with each other during vibration. The buffer material can be foam, rubber, or any other lightweight material that can prevent the two vibration units 20 from colliding.

[0047] Please refer to Figure 2 and Figure 3 In one embodiment of this utility model, the elastic component includes:

[0048] The first spring 23 and the second spring 25 are fixedly connected to the base 11 at one end and at the other end of the first spring 23 and the second spring 25 at different sides of the mass block 21.

[0049] In one embodiment of the present invention, an elastic component is used to movably fix the mass block 21 to the base 11, so that vibration is generated when the mass block 21 moves relative to the base 11. Understandably, the first elastic piece 23 and the second elastic piece 25 are fixed to different sides of the mass block 21, thereby creating two force points on different sides between the mass block 21 and the elastic component. This allows the mass block 21 to be suspended and fixed on the base 11 with good balance. In this embodiment, the different sides of the mass block 21 can be two opposing sides or two adjacent sides, depending on the shape of the mass block 21 and the shape of the base 11. For example, in one embodiment, the base 11 is a square structure, and the two mass blocks 21 are also square structures. In this case, the two vibration units 20 are symmetrically arranged along the center plane of the base 11, and one end of the first spring 23 and the second spring 25 are respectively fixedly connected to the two opposite sides of the mass block 21. In another embodiment, the base 11 is a square structure, and the two mass blocks 21 are triangular structures. In this case, the two vibration units 20 are symmetrically arranged along the diagonal of the base 11, and one end of the first spring 23 and the second spring 25 are respectively fixedly connected to the two adjacent sides of the mass block 21.

[0050] Reference Figures 2 to 5 In one embodiment of the present invention, the base 11 includes a base plate 111, and a first fixing ear 113 and a second fixing ear 115 are protruding from two opposite sides of the base plate 111, and the first fixing ear 113 and the second fixing ear 115 are spaced apart.

[0051] The two vibration units 20 are symmetrically distributed along the diagonal of the base plate 111, and the first spring piece 23 and the second spring piece 25 are both fixedly connected to the first fixing ear 113 and the second fixing ear 115 located on the same side.

[0052] In one embodiment of this utility model, the base plate 111 can be rectangular or square, wherein the rectangular base plate 111 has a longer diagonal. The first fixing ear 113 and the second fixing ear 115 are integral with the base plate 111. The first fixing ear 113 and the second fixing ear 115 on both sides of the base plate 111 are also symmetrically arranged. It can be understood that the shape and structure of the first fixing ear 113 and the second fixing ear 115 can be the same, or they can be flexibly set according to the shape of the first spring piece 23 and the second spring piece 25.

[0053] In one embodiment of the present invention, the first fixing ear 113 and the second fixing ear 115 have the same shape. The first fixing ear 113 and the first spring piece 23 can be fixedly connected by welding or by adhesive. Similarly, the second fixing ear 115 and the second spring piece 25 can also be fixedly connected by welding or by adhesive.

[0054] Reference Figures 2 to 5 In one embodiment of this utility model, the cross-section of the mass block 21 is triangular; the first spring sheet 23 has a first segment 231, a second segment 233, and a third segment 235 that are bent and connected in sequence. The first segment 231 is fixedly connected to the first fixing ear 113. The second segment 233 and the third segment 235 are respectively wrapped around the outer side of the adjacent side of the mass block 21. The end of the third segment 235 is fixedly connected to the side of the mass block 21; the piezoelectric ceramic sheet 27 is disposed on the second segment 233.

[0055] In one embodiment of the present invention, the shapes of the first spring 23 and the second spring 25 can be flexibly set according to the shape of the mass block 21. For example, the cross-section of the mass block 21 is triangular. This can be understood as the mass block 21 being roughly triangular. At this time, the long side of the triangle is parallel to the diagonal of the base 11, and the other two sides of the triangle are parallel to the side of the base 11. In this way, the shape of the mass block 21 can be made to match the shape of the base 11 along half of the diagonal as much as possible. That is, the shape of the mass block 21 is roughly formed into a right triangle. In this way, the internal structural space of the product can be maximized.

[0056] The first spring piece 23 is shaped to surround the long and short sides of the mass block 21. To allow for good freedom of movement, the first spring piece 23 can wrap around the outside of the long side of the mass block 21. The first spring piece 23 is also bent towards the other right-angled side of the mass block 21 to facilitate its fixed connection with the first fixing lug 113. The two ends of the second spring piece 25 are distributed along a straight line. One end of the second spring piece 25 is fixedly connected to the second fixing lug 115, and the other end is fixed to the side of the mass block 21. The side of the mass block 21 where the second spring piece 25 is fixed and the side of the mass block 21 where the first spring piece 23 is fixed are adjacent to each other. That is, the first spring piece 23 is fixed to the short side of the mass block 21, and the second spring piece 25 is fixed to the long side of the mass block 21. Furthermore, the fixing points of the first spring piece 23 and the mass block 21, and the fixing points of the second spring piece 25 and the mass block 21, are far apart from each other, so that the distance between the force-bearing points of the first spring piece 23 and the second spring piece 25 and the mass block 21 is sufficiently large to maintain the balance of the mass block 21 during vibration. By setting the first spring piece 23 into a bent three-segment structure and cooperating with the second spring piece 25, the mass block 21 can be suspended and fixed on the base 11, thus restricting the position of the mass block 21 while ensuring that the mass block 21 has sufficient flexibility to ensure that the mass block 21 can vibrate repeatedly under the drive of the piezoelectric ceramic sheet 27.

[0057] Please refer to Figures 2 to 5 In one embodiment of the present invention, the side of the mass block 21 facing the second segment 233 is the longest side, and the two ends of the piezoelectric ceramic sheet 27 extend to the two ends of the second segment 233.

[0058] In one embodiment of the present invention, the piezoelectric ceramic sheet 27 is placed on the outside of the longest side of the mass block 21, which can meet the requirement of placing a longer piezoelectric ceramic sheet 27. At the same time, the piezoelectric ceramic sheet 27 is attached to the surface of the second segment 233, which can also reduce the long axis rigidity caused by the long length of the ceramic sheet, which is more conducive to vibration performance.

[0059] Reference Figure 2 and Figure 3 In one embodiment of this utility model, a clearance notch 211 is formed on the side of the mass block 21 facing the fixing ear that fixes the second spring piece 25. In the technical solution of one embodiment of this utility model, by providing a clearance notch 211 on the mass block 21, the collision between the mass block 21 and the second fixing ear 115 during vibration can be avoided, thus preventing the vibration effect from being affected.

[0060] The piezoelectric vibration motor 100 in this invention features a "two-part" structure for the mass block 21 in the oscillator, with each mass block 21 driven by a separate piezoelectric ceramic plate 27. This effectively solves the energy loss caused by internal friction in the piezoelectric vibration motor 100, significantly improving the vibration effect. Furthermore, the piezoelectric vibration motor 100 in this design can be ultra-thin, with a thickness ranging from 1mm to 2mm. It boasts advantages such as compact size, high efficiency, low power consumption, and low noise, making it widely applicable in electronic devices such as mobile phones, watches, and game controllers.

[0061] In this embodiment, the first spring 23 and the second spring 25 can be made of elastic materials such as copper or steel. Since both the first spring 23 and the second spring 25 are fixed at only one end and are made of elastic materials, they can both fix the mass block 21 and provide sufficient degrees of freedom, making it easier for the mass block 21 to be driven by the piezoelectric ceramic sheet 27 to vibrate. The second spring 25 can also play a buffering and protective role during the vibration of the mass block 21, thus improving reliability.

[0062] Please refer to Figure 6 , Figure 6 The simulation results of the piezoelectric vibration motor 100 are shown in the figure. The first resonance peak is at 200Hz, which is the most sensitive frequency for human perception and meets the requirements of practical applications.

[0063] This utility model also provides an electronic device, including the piezoelectric vibration motor 100. The piezoelectric vibration motor 100 includes a base 11 and an oscillator. The oscillator includes two spaced-apart vibration units 20. Each vibration unit 20 includes a mass block 21, an elastic component, and a piezoelectric ceramic sheet 27. The mass block 21 is movably connected to the base 11 through the elastic component. The piezoelectric ceramic sheet 27 is disposed on the mass block 21 or the elastic component and drives the mass block 21 to vibrate relative to the base 11. The specific structure of the piezoelectric vibration motor 100 is as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A piezoelectric vibration motor, characterized in that, The system includes a base and an oscillator, the oscillator comprising two spaced-apart vibration units, each vibration unit comprising: Mass block; An elastic component is provided, through which the mass block is movably connected to the base; A piezoelectric ceramic sheet is disposed on the mass block or the elastic component, and drives the mass block to vibrate relative to the base.

2. The piezoelectric vibration motor as described in claim 1, characterized in that, The piezoelectric ceramic sheets in both vibration units are disposed on the elastic component, and the two piezoelectric ceramic sheets are arranged opposite to each other.

3. The piezoelectric vibration motor as described in claim 2, characterized in that, A cushioning material is filled between the two vibration units.

4. The piezoelectric vibration motor according to any one of claims 1 to 3, characterized in that, The elastic component includes: The first spring and the second spring are fixedly connected at one end to the base, and at the other end of the first spring and the other end of the second spring are fixed to different sides of the mass block.

5. The piezoelectric vibration motor as described in claim 4, characterized in that, The base includes a base plate, and a first fixing ear and a second fixing ear are protruding from two opposite sides of the base plate, and the first fixing ear and the second fixing ear are spaced apart. The two vibration units are symmetrically distributed along the diagonal of the base plate, and the first and second springs are fixedly connected to the first and second fixing ears located on the same side.

6. The piezoelectric vibration motor as described in claim 5, characterized in that, The cross-section of the mass block is triangular; The first spring has a first segment, a second segment, and a third segment that are bent and connected in sequence. The first segment is fixedly connected to the first fixing lug. The second segment and the third segment are respectively wrapped around the outer side of the adjacent side of the mass block, and the end of the third segment is fixedly connected to the side of the mass block. The piezoelectric ceramic sheet is disposed on the second segment.

7. The piezoelectric vibration motor as described in claim 6, characterized in that, The side of the mass block facing the second segment is the longest side, and the two ends of the piezoelectric ceramic sheet extend to the two ends of the second segment.

8. The piezoelectric vibration motor as described in claim 6, characterized in that, One end of the second spring is fixedly connected to the second fixing lug, and the other end of the second spring is fixed to the side of the mass block. The two ends of the second spring are distributed along a straight line. The side on which the mass block is fixed to the second spring is arranged adjacent to the side on which the first spring is fixed.

9. The piezoelectric vibration motor as described in claim 6, characterized in that, The mass block has an clearance notch on the side facing the fixing lug that fixes the second spring.

10. An electronic device, characterized in that, Including the piezoelectric vibration motor as described in any one of claims 1 to 9.

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