Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment. The sound production device comprises a piezoelectric plate, a cantilever plate and a vibration plate, wherein the piezoelectric plate is provided with a first surface and a second surface which are arranged oppositely; the cantilever piece is connected to the first surface of the piezoelectric piece in a stacked mode. The two ends of the cantilever piece protrude out of the piezoelectric piece at least in the length direction of the piezoelectric piece. A part of the structure of the cantilever piece is provided with a supporting part, the cantilever piece is fixedly arranged on the supporting part, and the area, except the supporting part, of the cantilever piece is in a free state; the vibration sheet is arranged close to the second surface of the piezoelectric sheet; in the length direction of the piezoelectric plate, the two ends of the vibrating plate are both flexibly connected with the cantilever plate, and a gap part is arranged between the vibrating plate and the second surface of the piezoelectric plate.

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 products. Especially for smartphones, with the increase of their functions, various devices have also increased; and traditional electromagnetic voice coil driven speakers are placed in electronic products in the form of modules, which occupy too much space in smartphones, thus limiting the space occupied by functional devices inside the phone.

[0004] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the invention

[0005] One purpose of the present application is to provide a new technical solution for a sound-generating device and an electronic device.

[0006] According to a first aspect of the present application, a sound-generating device is provided, the sound-generating device comprising:

[0007] A piezoelectric sheet having a first surface and a second surface disposed opposite to each other;

[0008] A cantilever sheet, wherein the cantilever sheet is laminated and connected to the first surface of the piezoelectric sheet; at least along the length direction of the piezoelectric sheet, both ends of the cantilever sheet are protruding from the piezoelectric sheet; a partial structure of the cantilever sheet is provided with a support portion, the cantilever sheet is fixedly arranged at the support portion, and the cantilever sheet is in a free state in the area outside the support portion;

[0009] A vibration plate is arranged close to the second surface of the piezoelectric plate; along the length direction of the piezoelectric plate, both ends of the vibration plate are flexibly connected to the cantilever plate, and a gap is arranged between the vibration plate and the second surface of the piezoelectric plate.

[0010] Optionally, along the width direction of the piezoelectric sheet, both sides of the cantilever sheet are protruding from the piezoelectric sheet.

[0011] Optionally, along the length direction of the piezoelectric sheet, the piezoelectric sheet is symmetrically arranged relative to the supporting portion.

[0012] Optionally, along a width direction of the piezoelectric sheet, the piezoelectric sheet is symmetrically arranged relative to the supporting portion.

[0013] Optionally, the vibration plate is made of carbon fiber.

[0014] Optionally, the ratio between the length of the piezoelectric sheet and its width is greater than or equal to 3:1 and less than or equal to 10:1.

[0015] Optionally, the ratio between the length of the piezoelectric sheet and its width is 6:1.

[0016] Optionally, the ratio of the thickness of the piezoelectric sheet to the thickness of the cantilever sheet is 2:1.

[0017] Optionally, the sound-generating device further comprises a support seat, and the cantilever piece is fixedly connected to the support seat at the support portion; a gap is arranged between the cantilever piece and the support seat in an area outside the support portion.

[0018] Optionally, the cantilever piece, the supporting portion and the supporting seat are an integrated structure.

[0019] Optionally, the length of the support portion is greater than the width of the piezoelectric sheet, and the length of the support portion is less than or equal to 1 / 3 of the length of the piezoelectric sheet.

[0020] Optionally, the sound-generating device further comprises a foam rubber pad, and both ends of the vibration plate are flexibly connected to the cantilever plate through the foam rubber pad.

[0021] Optionally, the cross section of the piezoelectric sheet along a direction perpendicular to the thickness direction is rectangular.

[0022] 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.

[0023] The sound-generating device provided in the embodiment of the present application is not only capable of vibrating and generating sound well, but also has a small size and occupies a small space. Applying it to electronic products is conducive to the miniaturization design of the electronic products.

[0024] 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

[0025] 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.

[0026] Figure 1 is a schematic diagram of the main structure of a sound-generating device according to an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the three-dimensional structure of a sound-generating device according to an embodiment of the present application Figure 1 ;

[0028] Figure 3 is a schematic diagram of the three-dimensional structure of a sound-generating device according to an embodiment of the present application Figure 2 ;

[0029] Figure 4 is a schematic diagram of the three-dimensional structure of a sound-generating device according to an embodiment of the present application Figure 3 .

[0030] Description of reference numerals:

[0031] 1. Sound-generating device; 11. Piezoelectric sheet; 12. Cantilever sheet; 120. Support portion; 13. Vibrating sheet; 14. Support seat; 140. Bottom plate; 141. First side plate; 142. Second side plate; 15. Foam rubber pad; 16. Glue layer; 100. Gap portion. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] 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.

[0037] Reference Figure 1 to Figure 4 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 sheet 11, a cantilever sheet 12 and a vibration sheet 13, wherein the piezoelectric sheet 11 has a first surface and a second surface disposed opposite to each other;

[0038] The cantilever piece 12 is laminated and connected to the first surface of the piezoelectric piece 11; at least along the length direction of the piezoelectric piece 11, both ends of the cantilever piece 12 are protruded from the piezoelectric piece 11; a partial structure of the cantilever piece 12 is provided with a support portion 120, the cantilever piece 12 is fixedly arranged on the support portion 120, and the cantilever piece 12 is in a free state in the area outside the support portion 120;

[0039] The vibration plate 13 is arranged close to the second surface of the piezoelectric plate 11 ; along the length direction of the piezoelectric plate 11 , both ends of the vibration plate 13 are flexibly connected to the cantilever plate 12 , and a gap portion 100 is arranged between the vibration plate 13 and the second surface of the piezoelectric plate 11 .

[0040] In the sound-generating device 1 provided in the embodiment of the present application, the piezoelectric sheet 11 is one of its core components. For example, the cross section of the piezoelectric sheet 11 perpendicular to the thickness direction is rectangular; specifically, the piezoelectric sheet 11 is a thin cuboid. The piezoelectric sheet 11 has a first surface and a second surface disposed opposite to each other. When a voltage is applied to the piezoelectric sheet 11, the piezoelectric sheet 11 will generate a telescopic deformation between the two surfaces, thereby generating a driving force.

[0041] The cantilever piece 12 is laminated and connected to the first surface of the piezoelectric piece 11, and at least along the length direction of the piezoelectric piece 11, both ends of the cantilever piece 12 are protruding from the piezoelectric piece 11; such a design enables the cantilever piece 12 to generate a larger amplitude when affected by the deformation of the piezoelectric piece 11, thereby driving the vibration piece 13 to vibrate, and the vibration piece 13 then pushes the air to make a sound. A partial structure of the cantilever piece 12 is provided with a support portion 120, for example, a support portion 120 is provided in the middle of both sides of the cantilever piece 12, the cantilever piece 12 is fixed at the support portion 120, and the area outside the support portion 120 is in a free state, so as to achieve free vibration.

[0042] The vibration sheet 13 is arranged close to the second surface of the piezoelectric sheet 11, and along the length direction of the piezoelectric sheet 11, both ends of the vibration sheet 13 are flexibly connected to the cantilever sheet 12; this flexible connection enables the vibration sheet 13 to generate continuous vibration when affected by the vibration of the cantilever sheet 12, thereby pushing the air and making sound. At the same time, a gap is provided between the vibration sheet 13 and the second surface of the piezoelectric sheet 11 to avoid direct contact between the two, thereby ensuring smooth vibration.

[0043] In the sound-generating device 1 provided in the embodiment of the present application, the vibration action is transmitted from the piezoelectric sheet 11 to the cantilever sheet 12 and then to the vibration sheet 13; since the cantilever sheet 12 is fixedly arranged in the middle of its two sides and the rest of the position can vibrate freely, and the two ends of the cantilever sheet 12 are flexibly connected to the two ends of the vibration sheet 13 respectively; thus, the piezoelectric sheet 11 and the cantilever sheet 12 as a whole can produce the effect of bending vibration at both ends relative to the middle part, and finally drive the vibration plate 13 to move linearly to instigate air to make sound.

[0044] Furthermore, the piezoelectric sheet 11, the cantilever sheet 12 and the vibration plate 13 are all in the shape of a thin rectangular parallelepiped; the lengths of the three extend along the first direction and the widths extend along the second direction; the middle parts of both sides of the cantilever sheet 12 along the second direction are provided with support parts 120, and the two ends of the cantilever sheet 12 along the first direction are flexibly connected to the two ends of the vibration sheet 13 along the first direction. Figure 2 to Figure 4 As shown, the first direction is direction a, and the second direction is direction b.

[0045] In summary, the sound-emitting device 1 provided in the embodiment of the present application can not only vibrate and emit sound well, but also has a regular shape, a small size, and occupies a small space. Applying it to electronic products is conducive to the miniaturization design of electronic products; it is particularly suitable for use in smart phones. For example, the sound-emitting device 1 is placed at the bottom of the smart phone, and the sound is transmitted through the sound outlet at the bottom of the phone.

[0046] Reference Figure 1 to Figure 4 As shown, in one embodiment, along the width direction of the piezoelectric sheet 11 , both sides of the cantilever sheet 12 protrude from the piezoelectric sheet 11 .

[0047] In this specific example, the length and width of the cantilever piece 12 are greater than the piezoelectric piece 11 , and the projection of the piezoelectric piece 11 along the thickness direction is completely within the range of the cantilever piece 12 , which can ensure that the piezoelectric piece 11 drives the cantilever piece 12 to vibrate.

[0048] Reference Figure 1 to Figure 4 As shown, in one embodiment, along the length direction of the piezoelectric sheet 11 , the piezoelectric sheet 11 is symmetrically arranged relative to the supporting portion 120 .

[0049] Furthermore, along the width direction of the piezoelectric sheet 11 , the piezoelectric sheet 11 is symmetrically arranged relative to the support portion 120 .

[0050] In this specific example, the central axis of the piezoelectric sheet 11 coincides with the central axis of the cantilever sheet 12; the support portion 120 is not only located in the middle of both sides of the cantilever sheet 12, but the piezoelectric sheet 11 is also symmetrically arranged relative to the support portion 120 in its length and width directions; this ensures that the amplitudes of the piezoelectric sheet 11 and the cantilever sheet 12 remain consistent during vibration, thereby having better balance and stability.

[0051] Reference Figure 1 to Figure 4 As shown, in one embodiment, the vibration plate 13 is made of carbon fiber.

[0052] In this specific example, the vibration plate 13 is made of carbon fiber, which has the characteristics of low density and high hardness, so that the vibration plate 13 can maintain strong vibration ability at high frequencies and the sound pressure level is relatively stable.

[0053] Reference Figure 1 to Figure 4 As shown, in one embodiment, the ratio between the length of the piezoelectric sheet 11 and its width is greater than or equal to 3:1 and less than or equal to 10:1.

[0054] In this specific example, the ratio between the length of the piezoelectric sheet 11 and its width is greater than or equal to 3:1 and less than or equal to 10:1, thereby ensuring that the piezoelectric sheet 11 can match the cantilever sheet 12 to form a bending deformation, and ensuring that the piezoelectric sheet 11 and the cantilever sheet 12 can form a strong lever effect to maximize the vibration amplitude, so as to drive the vibration sheet 13 to generate a larger displacement. For example, the ratio between the length of the piezoelectric sheet 11 and its width is 6:1.

[0055] Reference Figure 1 to Figure 4 As shown, in one embodiment, the ratio of the thickness of the piezoelectric sheet 11 to the thickness of the cantilever sheet 12 is 2:1.

[0056] In this specific example, the ratio of the thickness of the piezoelectric sheet 11 to the thickness of the cantilever sheet 12 is 2:1, thereby ensuring that the piezoelectric sheet 11 can easily and effectively drive the cantilever sheet 12 to vibrate together, so that the two have better coordination when vibrating.

[0057] Optionally, the piezoelectric sheet 11 and the cantilever sheet 12 are bonded together by an adhesive layer 16 .

[0058] Optionally, the piezoelectric sheet 11 is a single crystal piezoelectric ceramic. Optionally, the piezoelectric sheet 11 has a width of 4 mm, a length of 25 mm, and a thickness of 0.5 mm to adapt to the size of a smart phone.

[0059] Reference Figure 1 to Figure 4 As shown, in one embodiment, the sound-generating device further includes a support seat 14 , and the cantilever piece 12 is fixedly connected to the support seat 14 at the support portion 120 ; a gap is provided between the cantilever piece 12 and the support seat 14 in an area outside the support portion 120 .

[0060] In this specific example, the support seat 14 serves as a connecting support for the cantilever piece 12; the support seat 14 includes a base plate 140, a first side plate 141 and a second side plate 142, the first side plate 141 and the second side plate 142 are both connected to the base plate 140, and the first side plate 141 and the second side plate 142 are arranged opposite to each other along the second direction; a cavity structure is formed between the base plate 140, the first side plate 141 and the second side plate 142; one of the two supporting parts 120 is fixedly connected to the first side plate 141, and the other is fixedly connected to the second side plate 142, and the cantilever piece 12 is in a suspended state corresponding to the cavity structure.

[0061] Reference Figure 1 to Figure 4 As shown, in one embodiment, the cantilever piece 12, the support portion 120 and the support seat 14 are an integrated structure.

[0062] In this specific example, the cantilever piece 12, the supporting portion 120 and the supporting seat 14 may be an integrated structure to improve the strength and stability of the entire sound-generating device.

[0063] Reference Figure 1 to Figure 4 As shown, in one embodiment, the length of the support portion 120 is greater than the width of the piezoelectric sheet 11 , and the length of the support portion 120 is less than or equal to 1 / 3 of the length of the piezoelectric sheet 11 .

[0064] If the length of the support portion 120 is too short, the reliability of the sound-generating device 1 will be reduced (especially when the electronic product falls); if the length of the support portion 120 is too long, the vibration performance of the piezoelectric sheet 11 and the cantilever sheet 12 will be reduced. Therefore, in this specific example, the length of the support portion 120 is greater than the width of the piezoelectric sheet 11, and the length of the support portion 120 is less than or equal to 1 / 3 of the length of the piezoelectric sheet 11; thereby ensuring the vibration performance and reliability of the sound-generating device 1.

[0065] Reference Figure 1 to Figure 4 As shown, in one embodiment, the sound-generating device further includes a foam rubber pad 15 , and both ends of the vibration plate 13 are flexibly connected to the cantilever plate 12 through the foam rubber pad 15 .

[0066] In this specific example, one end of the vibration plate 13 along the first direction is connected to one end of the cantilever plate 12 along the first direction through a foam rubber pad 15; the other end of the vibration plate 13 along the first direction is connected to the other end of the cantilever plate 12 along the first direction through another foam rubber pad 15. Such a connection method can ensure that the vibration plate 13 can generate continuous and stable vibration when affected by the vibration of the cantilever plate 12. Optionally, the vibration plate 13 and the foam rubber pad 15, as well as the cantilever plate 12 and the foam rubber pad 15, are both bonded.

[0067] 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.

[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 sheet (11), the piezoelectric sheet (11) having a first surface and a second surface disposed opposite to each other; A cantilever sheet (12), the cantilever sheet (12) being laminated and connected to the first surface of the piezoelectric sheet (11); at least along the length direction of the piezoelectric sheet (11), both ends of the cantilever sheet (12) are arranged to protrude from the piezoelectric sheet (11); A partial structure of the cantilever piece (12) is provided with a support portion (120), the cantilever piece (12) is fixedly arranged on the support portion (120), and the cantilever piece (12) is in a free state in an area outside the support portion (120); A vibration plate (13), wherein the vibration plate (13) is arranged close to the second surface of the piezoelectric plate (11); along the length direction of the piezoelectric plate (11), both ends of the vibration plate (13) are flexibly connected to the cantilever plate (12), and a gap portion is arranged between the vibration plate (13) and the second surface of the piezoelectric plate (11).

2. The sound generating device according to claim 1, characterized in that: Along the width direction of the piezoelectric sheet (11), both sides of the cantilever sheet (12) are arranged to protrude from the piezoelectric sheet (11).

3. The sound generating device according to claim 1, characterized in that: Along the length direction of the piezoelectric sheet (11), the piezoelectric sheet (11) is symmetrically arranged relative to the support portion (120).

4. The sound-generating device according to claim 3, characterized in that: Along the width direction of the piezoelectric sheet (11), the piezoelectric sheet (11) is symmetrically arranged relative to the support portion (120).

5. The sound generating device according to claim 1, characterized in that: The material of the vibration plate (13) is carbon fiber.

6. The sound generating device according to claim 1, characterized in that: The ratio between the length of the piezoelectric sheet (11) and its width is greater than or equal to 3:1 and less than or equal to 10:

1.

7. The sound generating device according to claim 6, characterized in that: The ratio between the length of the piezoelectric sheet (11) and its width is 6:

1.

8. The sound generating device according to claim 1, characterized in that: The ratio of the thickness of the piezoelectric sheet (11) to the thickness of the cantilever sheet (12) is 2:

1.

9. The sound generating device according to claim 1, characterized in that: The sound-generating device further comprises a support seat (14), the cantilever piece (12) being fixedly connected to the support seat (14) at the support portion (120); and a gap is provided between the cantilever piece (12) and the support seat (14) in an area outside the support portion (120).

10. The sound generating device according to claim 9, characterized in that: The cantilever piece (12), the support portion (120) and the support seat (14) are an integrated structure.

11. The sound generating device according to claim 1 or 9, characterized in that: The length of the support portion (120) is greater than the width of the piezoelectric sheet (11), and the length of the support portion (120) is less than or equal to 1 / 3 of the length of the piezoelectric sheet (11).

12. The sound generating device according to claim 1, characterized in that: The sound-generating device further comprises a foam rubber pad (15), and both ends of the vibration plate (13) are flexibly connected to the cantilever plate (12) via the foam rubber pad (15).

13. The sound generating device according to claim 1, characterized in that: The cross section of the piezoelectric sheet (11) along the direction perpendicular to the thickness is rectangular.

14. An electronic device, characterized in that: The electronic device comprises a sound emitting device (1) as claimed in any one of claims 1 to 13.

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