Sound production device and electronic equipment
By designing the sounding device of the second connecting piece and the ring-shaped flexible member with a gap set, the problems of large volume and poor acoustic performance of the traditional sounding device are solved, and higher vibration ability and acoustic performance are achieved, which is suitable for thin and light design of electronic products.
Patent Information
- Application Number
- CN202411832642.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-18
AI Technical Summary
The traditional electromagnetic powered voice coil drive sound generator has a large size, which is not conducive to the lightweight development of electronic products. The vibration ability and acoustic performance of the piezoelectric drive sound generator are poor.
A sound generating device including a piezoelectric assembly, a first connecting piece, a second connecting piece and a flexible member is designed. A gap is provided between the second connecting piece and the piezoelectric assembly, and the flexible member is connected between the first connecting piece and the second connecting piece to form an annular structure to surround the piezoelectric assembly.
The second connecting piece arranged through the gap avoids full constraints on the piezoelectric component, and improves the vibration ability and acoustic performance of the sound generator; the arrangement of the flexible parts makes the sound generator have compression ability and internal stress, which improves its rigidity and vibration properties.
Smart Images
Figure CN119854708A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic products, and more specifically, to a sound-generating device and an electronic device. Background Art
[0002] With the development of science and technology and the improvement of living standards, various electronic products have gradually entered thousands of households and become necessities of people's lives; sound-generating devices are installed in many electronic products, such as smart phones, laptops, tablets, etc.
[0003] In recent years, many electronic products have been trending towards thinner, lighter and smaller sizes. Especially for smartphones, the thickness of the phone directly affects the user's hand-held grip, and thinner phones are easier to carry, thus improving the user experience.
[0004] Traditional electromagnetic voice coil driven sound devices are placed in electronic products in the form of modules, which are large in size and not conducive to the development of thin and light electronic products. Although piezoelectric driven sound devices occupy less space, conventional piezoelectric driven sound devices have poor vibration capacity and acoustic performance.
[0005] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the invention
[0006] One purpose of the present application is to provide a new technical solution for a sound-generating device and an electronic device.
[0007] According to a first aspect of the present application, a sound-generating device is provided, the sound-generating device comprising:
[0008] A piezoelectric component, the piezoelectric component having a first side and a second side disposed opposite to each other in a thickness direction, the piezoelectric component being capable of vibrating in an energized state;
[0009] a first connecting sheet connected to a first side of the piezoelectric component;
[0010] a second connecting sheet, the second connecting sheet being arranged close to the second side of the piezoelectric component, and a gap being arranged between the second connecting sheet and the piezoelectric component;
[0011] A flexible member is spaced apart from the piezoelectric component and connected between the first connecting piece and the second connecting piece.
[0012] Optionally, the second connecting piece and the flexible member are both annular, the flexible member is arranged around the piezoelectric component, and the second connecting piece is connected to a side of the flexible member facing away from the first connecting piece.
[0013] Optionally, the piezoelectric component includes a first piezoelectric sheet, a second piezoelectric sheet and an insulating sheet, the first piezoelectric sheet, the insulating sheet and the second piezoelectric sheet are stacked, and the insulating sheet is sandwiched between the first piezoelectric sheet and the second piezoelectric sheet.
[0014] Optionally, the thickness of the first piezoelectric sheet is the same as the thickness of the second piezoelectric sheet.
[0015] Optionally, the thickness of the first piezoelectric sheet is 2 to 3 times the thickness of the insulating sheet.
[0016] Optionally, the cross-section of the first piezoelectric sheet and the second piezoelectric sheet along the thickness direction is a rectangle with an aspect ratio of 2:1 to 5:1.
[0017] Optionally, the flexible member is foam, and the hardness of the foam is 45 degrees to 60 degrees.
[0018] Optionally, the width of the foam is 0.5-2 mm.
[0019] According to a second aspect of the present application, an electronic device is provided, wherein the electronic device comprises the sound-generating device as described in the first aspect.
[0020] Optionally, the electronic device further comprises a device body having two oppositely arranged supporting members, and both ends of the sound-emitting device along the length direction are respectively fixed to the two supporting members; the supporting members are configured to apply pressure to the sound-emitting device along the thickness direction thereof.
[0021] In the sound-generating device provided in the embodiment of the present application, since the second connecting piece is not directly connected to the piezoelectric component, but a gap is set between the second connecting piece and the piezoelectric component, it can avoid direct contact with the piezoelectric component and cause full constraint on the piezoelectric component, thereby limiting the vibration performance of the piezoelectric component. Therefore, the spacing between the second connecting piece and the piezoelectric component is conducive to improving the vibration ability of the sound-generating device and thus improving its acoustic performance. In addition, the setting of the flexible part can make the sound-generating device have the ability to compress. When the sound-generating device is installed in the whole electronic device, it can be in a compressed state and have a certain internal stress, thereby reducing its rigidity and improving its vibration performance.
[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.
[0024] Figure 1ais a schematic diagram of the exploded structure of a sound-generating device according to an embodiment of the present application;
[0025] Figure 1b is a schematic cross-sectional structural diagram of a sound-generating device according to an embodiment of the present application;
[0026] Figure 1c is a schematic diagram of a top view of a sound-generating device according to an embodiment of the present application;
[0027] Figure 1d is a structural schematic diagram 1 of a piezoelectric component in a sound-generating device according to an embodiment of the present application;
[0028] Figure 1e The structure of the piezoelectric component in the sound-generating device according to one embodiment of the present application is shown in FIG. Figure 2 ;
[0029] Figure 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
[0030] Figure 3 This is a simulation data diagram of a sound-generating device according to an embodiment of the present application.
[0031] Description of reference numerals:
[0032] 1. Sound-generating device; 10. Piezoelectric component; 101. First piezoelectric sheet; 102. Second piezoelectric sheet; 100. Insulating sheet; 11. First connecting sheet; 12. Second connecting sheet; 13. Flexible member; 14. First adhesive layer; 15. Second adhesive layer; 2. Equipment body; 21. Support member. DETAILED DESCRIPTION
[0033] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application.
[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.
[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0036] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0038] Reference Figure 1a to Figure 1d As shown, according to an embodiment of the present application, a sound-generating device 1 is provided. The sound-generating device 1 comprises a piezoelectric component 10, a first connecting piece 11, a second connecting piece 12 and a flexible member 13, wherein the piezoelectric component 10 has a first side and a second side disposed opposite to each other in the thickness direction, and the piezoelectric component 10 can vibrate in a power-on state; the first connecting piece 11 is connected to the first side of the piezoelectric component 10; the second connecting piece 12 is disposed close to the second side of the piezoelectric component 10, and a gap is disposed between the second connecting piece 12 and the piezoelectric component 10; the flexible member 13 is disposed at a distance from the piezoelectric component 10, and the flexible member 13 is connected between the first connecting piece 11 and the second connecting piece 12.
[0039] In the sound-generating device 1 provided in the embodiment of the present application, the piezoelectric component 10 can vibrate when powered on, and the vibration is transmitted from the piezoelectric component 10 to the first connecting piece 11 connected thereto and then to the flexible member 13 and the second connecting piece 12 .
[0040] The piezoelectric component 10 is the core component of the sound-generating device 1, which has a first side and a second side arranged opposite to each other in the thickness direction; when the piezoelectric component 10 is energized, it will vibrate under the action of the electric field, and this vibration can instigate the surrounding air to vibrate, and the vibration of the air is transmitted in the form of sound waves.
[0041] The first connecting piece 11 is connected to the first side of the piezoelectric component 10, and it plays a role in fixing and supporting the piezoelectric component 10, and it can directly vibrate with the piezoelectric component 10. The second connecting piece 12 is arranged close to the second side of the piezoelectric component 10, but a certain gap is maintained between it and the piezoelectric component 10. It first receives the vibration of the piezoelectric component 10 through the first connecting piece 11 and then through the flexible member 13, that is, it indirectly vibrates with the piezoelectric component 10. In the case where the sound-generating device 1 is applied to a complete electronic device, the second connecting piece 12 is arranged close to the device body of the electronic device to transmit the vibration of the piezoelectric component 10 to the device body. Since the second connecting piece 12 is not directly in contact with the piezoelectric component 10, but a gap is set between it and the piezoelectric component 10, it can avoid direct contact with the piezoelectric component 10 and cause full constraint on the piezoelectric component 10, thereby limiting the vibration performance of the piezoelectric component 10. Therefore, the spacing between the second connecting piece 12 and the piezoelectric component 10 is conducive to improving the vibration ability of the sound-generating device 1 and thus improving its acoustic performance. Moreover, the arrangement of the flexible member 13 enables the sound-generating device 1 to have a compressive capability. When the sound-generating device 1 is installed in a complete electronic device, it can be in a compressed state and have a certain internal stress, thereby reducing its rigidity and improving its vibration performance; in particular, referring to Figure 3 As shown, the arrangement of the flexible member 13 enables the vibration frequency of the sound-generating device 1 to have a larger amplitude in the high-frequency range, so that the sound has a better effect in the high frequency range; Figure 3 A in the middle shows that the sound intensity of the sound-generating device 1 in the high frequency band can reach 75dB to 85dB.
[0042] In addition, the flexible member 13 is spaced apart from the piezoelectric component 10 to avoid restraining the vibration of the piezoelectric component 10; and the flexible member 13 can adjust the vibration frequency and amplitude of the sound-generating device and prevent the piezoelectric component 10 from being damaged by excessive impact during vibration.
[0043] In summary, the sound-generating device 1 provided in the embodiment of the present application adopts piezoelectric drive to generate sound, has a small size and occupies a small space, and its application in electronic products is conducive to the miniaturization design of electronic products; and the sound-generating device has excellent vibration capacity and acoustic performance.
[0044] Optionally, the first connecting sheet 11 may be a plastic sheet or a copper sheet; and the second connecting sheet 12 may be a steel sheet.
[0045] Reference Figure 1a As shown, in one embodiment, the second connecting piece 12 and the flexible member 13 are both annular, the flexible member 13 is arranged around the piezoelectric component 10, and the second connecting piece 12 is connected to the side of the flexible member 13 facing away from the first connecting piece 11.
[0046] In this specific example, the second connecting piece 12 and the flexible member 13 are both annular in shape, the flexible member 13 is arranged around the piezoelectric component 10, and the second connecting piece 12 is connected to the side of the flexible member 13 facing away from the first connecting piece 11; this can help the piezoelectric component 10 to form a more uniform sound wave distribution when vibrating.
[0047] Optionally, the first connecting piece 11 and the piezoelectric component 10 are bonded together via a first adhesive layer 14 , and the second connecting piece 12 and the flexible member 13 are bonded together via a second adhesive layer 15 .
[0048] Reference Figure 1d As shown, in one embodiment, the piezoelectric component 10 includes a first piezoelectric sheet 101, a second piezoelectric sheet 102 and an insulating sheet 100. The first piezoelectric sheet 101, the insulating sheet 100 and the second piezoelectric sheet 102 are stacked, and the insulating sheet 100 is sandwiched between the first piezoelectric sheet 101 and the second piezoelectric sheet 102.
[0049] In this specific example, the piezoelectric component 10 is the core vibration element of the sound-generating device 1, and includes a first piezoelectric sheet 101, an insulating sheet 100, and a second piezoelectric sheet 102 that are sequentially stacked. The structure of the first piezoelectric sheet 101 and the second piezoelectric sheet 102 can improve the vibration capability of the piezoelectric component 10; and sandwiching the insulating sheet 100 between the first piezoelectric sheet 101 and the second piezoelectric sheet 102 helps to improve the bearing capacity of the piezoelectric component 10, so that the piezoelectric component 10 has higher reliability.
[0050] Reference Figure 1d As shown, in one embodiment, the thickness of the first piezoelectric sheet 101 is the same as the thickness of the second piezoelectric sheet 102 .
[0051] In this specific example, the thickness of the first piezoelectric sheet 101 is the same as the thickness of the second piezoelectric sheet 102 , which helps to improve the vibration uniformity and vibration stability of the piezoelectric component 10 , thereby ensuring that the sound-generating device 1 has excellent acoustic performance.
[0052] Reference Figure 1d As shown, in one embodiment, the thickness of the first piezoelectric sheet 101 is 2 to 3 times the thickness of the insulating sheet 100 .
[0053] Since the insulating sheet 100 is mainly subjected to shear stress during the vibration deformation of the first piezoelectric sheet 101 and the second piezoelectric sheet 102, if the thickness of the insulating sheet 100 is too thin, the bearing capacity of the piezoelectric assembly 10 will be weakened; and if the thickness of the insulating sheet 100 is too thick, the vibration capacity of the piezoelectric assembly 10 will be reduced. Therefore, in this specific example, the thickness of the first piezoelectric sheet 101 (that is, the thickness of the second piezoelectric sheet 102) is 2 to 3 times the thickness of the insulating sheet 100, which can not only improve the bearing capacity of the piezoelectric assembly 10, so that the piezoelectric assembly 10 has higher reliability, but also ensure the vibration capacity of the piezoelectric assembly 10.
[0054] In an optional example, the ratio of the thickness of the first piezoelectric sheet 101 to the thickness of the insulating sheet 100 is 5:2.
[0055] In one embodiment, the cross-section of the first piezoelectric sheet 101 and the second piezoelectric sheet 102 along the thickness direction is a rectangle with an aspect ratio of 2:1 to 5:1.
[0056] In this specific example, the first piezoelectric sheet 101 and the second piezoelectric sheet 102 are both in the shape of a thin rectangular parallelepiped; wherein the ratio of length to width is in the range of 2:1 to 5:1, which helps to ensure that the piezoelectric component 10 has better performance. Because the higher the aspect ratio of the first piezoelectric sheet 101 and the second piezoelectric sheet 102, the better the vibration performance, that is, the easier it is to vibrate and the stronger the vibration; however, if the aspect ratio of the first piezoelectric sheet 101 and the second piezoelectric sheet 102 is too high, its reliability deteriorates, and it is easy to have problems such as vibration fracture or falling and breaking. Combining theoretical analysis and practical experience, when the aspect ratio of the first piezoelectric sheet 101 and the second piezoelectric sheet 102 is in the range of 2:1 to 5:1, it can achieve better vibration performance and ensure higher reliability.
[0057] In one embodiment, the flexible member 13 is foam, and the hardness of the foam is 45 degrees to 60 degrees.
[0058] Using foam as a flexible member is low in cost and easy to install. The hardness of the foam should not be too low, otherwise the structural stability of the sound-generating device 1 is low; if the hardness of the foam is too high, the compression capacity of the sound-generating device 1 is reduced. Therefore, in this specific example, the hardness of the foam is within the range of 45 degrees to 60 degrees, so that the resonance peak of the sound-generating device 1 is shifted backward, the vibration amplitude of the application frequency band is improved, and the performance of the sound-generating device 1 is ensured. Optionally, the foam can be EVA foam or Korel polyurethane foam or PU foam.
[0059] Reference Figure 1b As shown, in one embodiment, the width W of the foam is 0.5-2 mm.
[0060] In this specific example, the width W of the foam is set within the range of 0.5 to 2 mm, which helps to improve the structural rigidity of the sound-generating device 1 .
[0061] Reference Figure 1e As shown, in one embodiment, the middle regions of the first side and the second side of the piezoelectric component 10 are recessed and disposed close to each other.
[0062] In this specific example, the piezoelectric component 10 can be set to a structure with a concave middle area, which can reduce the cross-sectional area of the middle area, that is, the rigidity of the middle area is weakened, making it easier to vibrate and improving the vibration capacity.
[0063] According to another embodiment of the present application, an electronic device is provided, and the electronic device includes the sound-generating device 1 as described above.
[0064] The electronic device provided in the embodiment of the present application has good acoustic performance due to the inclusion of the above-mentioned sound-generating device 1. The electronic device may be, for example, a smart phone.
[0065] Reference Figure 2 As shown, in one embodiment, the electronic device also includes a device body 2, the device body 2 has two oppositely arranged support members 21, and the two ends of the sound-emitting device 1 along the length direction are respectively fixed to the two support members 21; the support members 21 are configured to apply pressure to the sound-emitting device 1 along its thickness direction.
[0066] In this specific example, the support member 21 is provided in the device body 2, for example, near the side button of the mobile phone or below the screen. The two support members 21 are arranged opposite to each other along the length direction of the sound-generating device 1. After the two ends of the sound-generating device 1 along its length direction are mounted and fixed on the support members 21, the sound-generating device 1 has a certain internal stress, that is, the sound-generating device 1 is in a pre-tightened assembly state, thereby increasing the amplitude of the vibration of the sound-generating device 1 and shifting the resonance peak backward, thereby improving the acoustic performance of the sound-generating device 1 in the high-frequency application band.
[0067] Reference Figure 2 As shown, the length direction of the sound-generating device 1 is Figure 2 The L direction in the thickness direction is Figure 2 The T direction.
[0068] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.
[0069] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.
Claims
1. A sound-generating device, characterized in that: The sound-generating device comprises: A piezoelectric component (10), the piezoelectric component (10) having a first side and a second side disposed opposite to each other in a thickness direction, the piezoelectric component (10) being capable of vibrating when powered on; A first connecting piece (11), the first connecting piece (11) being connected to a first side of the piezoelectric component (10); a second connecting sheet (12), the second connecting sheet (12) being arranged close to a second side of the piezoelectric component (10), and a gap being arranged between the second connecting sheet (12) and the piezoelectric component (10); A flexible member (13), wherein the flexible member (13) is spaced apart from the piezoelectric component (10), and the flexible member (13) is connected between the first connecting piece (11) and the second connecting piece (12).
2. The sound generating device according to claim 1, characterized in that: The second connecting piece (12) and the flexible member (13) are both annular in shape; the flexible member (13) is arranged around the piezoelectric component (10); and the second connecting piece (12) is connected to the side of the flexible member (13) that faces away from the first connecting piece (11).
3. The sound generating device according to claim 1, characterized in that: The piezoelectric component (10) comprises a first piezoelectric sheet (101), a second piezoelectric sheet (102) and an insulating sheet (100); the first piezoelectric sheet (101), the insulating sheet (100) and the second piezoelectric sheet (102) are stacked, and the insulating sheet (100) is sandwiched between the first piezoelectric sheet (101) and the second piezoelectric sheet (102).
4. The sound generating device according to claim 3, characterized in that: The thickness of the first piezoelectric sheet (101) is the same as the thickness of the second piezoelectric sheet (102).
5. The sound generating device according to claim 4, characterized in that: The thickness of the first piezoelectric sheet (101) is 2 to 3 times the thickness of the insulating sheet (100).
6. The sound generating device according to claim 3, characterized in that: The cross-sections of the first piezoelectric sheet (101) and the second piezoelectric sheet (102) along the thickness direction are rectangular with a length-to-width ratio of 2:1 to 5:
1.
7. The sound-generating device according to any one of claims 1 to 6, characterized in that: The flexible member (13) is foam, and the hardness of the foam is 45 to 60 degrees.
8. The sound generating device according to claim 7, characterized in that: The width of the foam is 0.5-2 mm.
9. An electronic device, characterized in that: The electronic device comprises a sound emitting device (1) as claimed in any one of claims 1 to 8.
10. The electronic device according to claim 9, characterized in that: The electronic device further comprises a device body (2), the device body (2) having two oppositely arranged support members (21), the two ends of the sound-generating device (1) along the length direction are respectively fixed to the two support members (21); the support members (21) are configured to apply pressure to the sound-generating device (1) along the thickness direction thereof.