CN119743712A - Sound generating device and electronic equipment - Google Patents

Abstract

The application discloses a sound generating device and electronic equipment. The sound generating device comprises a piezoelectric sheet, a connecting sheet and a mass piece, wherein the cross section of the piezoelectric sheet in the direction perpendicular to the thickness direction comprises a first side edge, a second side edge, a third side edge and a fourth side edge, the first side edge and the second side edge are oppositely arranged in the first direction, the first side edge and the second side edge are arc-shaped, the third side edge and the fourth side edge are oppositely arranged in the second direction, the third side edge and the fourth side edge are straight-line-shaped, the piezoelectric sheet is provided with a first surface arranged in the thickness direction, the connecting sheet is connected to the first surface of the piezoelectric sheet in a stacked mode, and the mass piece is located on one side, far away from the piezoelectric sheet, of the connecting sheet and is flexibly connected with the connecting sheet.

Description

Sound generating device and electronic equipment

Technical Field

The present application relates to the technical field of electronic products, and in particular, to a sound generating device and an electronic device.

Background

Along with the development of scientific technology and the improvement of living standard, various electronic products gradually enter thousands of households to become living necessities of people, and sound generating devices such as smart phones, notebook computers, tablet computers and the like are arranged in many electronic products.

In recent years, many electronic products are increasingly tending to be lighter and smaller. The traditional electromagnetic power voice coil driving sounding device is placed in an electronic product in a module mode, and the volume of the traditional electromagnetic power voice coil driving sounding device is large, so that the traditional electromagnetic power voice coil driving sounding device is unfavorable for the light and thin development of the electronic product. Although the piezoelectric driving sound generating device occupies a small space, the conventional piezoelectric driving sound generating device has poor acoustic performance, especially poor low-frequency acoustic performance.

In view of this, a new technical solution is needed to improve the low-frequency acoustic performance of the piezoelectric driving sound generator.

Disclosure of Invention

An object of the present application is to provide a new technical solution of a sound generating device and an electronic apparatus.

According to a first aspect of the present application, there is provided a sound emitting device comprising:

The piezoelectric sheet comprises a piezoelectric sheet, a first side, a second side, a third side and a fourth side, wherein the cross section of the piezoelectric sheet along the direction perpendicular to the thickness direction comprises the first side, the second side, the third side and the fourth side, the first side and the second side are oppositely arranged along the first direction and are arc-shaped, the third side and the fourth side are oppositely arranged along the second direction and are straight, and the piezoelectric sheet is provided with a first surface arranged along the thickness direction;

A connection sheet laminated to the first surface of the piezoelectric sheet;

The mass piece is located on one side, far away from the piezoelectric piece, of the connecting piece, and the mass piece is flexibly connected with the connecting piece.

Optionally, the first side edge and the second side edge are arc-shaped with equal radius, the third side edge and the fourth side edge are straight lines with equal length, and the diameter of the first side edge is larger than the length of the third side edge.

Optionally, the ratio of the thickness of the piezoelectric sheet to the thickness of the connecting sheet is 2:1.

Optionally, the connecting piece is made of high polymer material or light foam metal.

Optionally, along the thickness direction of the piezoelectric sheet, the projection of the piezoelectric sheet is located within the projection range of the connecting sheet.

Optionally, the connecting piece is circular, and the center axis of the connecting piece coincides with the center axis of the piezoelectric piece.

Optionally, the radius of the connecting tab is at least 1mm greater than the radius of the first side edge.

Optionally, the sound generating device further comprises a foam layer, and the foam layer is arranged between the mass piece and the connecting piece.

Optionally, the thickness of the foam layer is greater than or equal to 0.1mm.

Optionally, the mass member is of a layered structure, or the mass member comprises a plurality of mass blocks arranged at intervals.

According to a second aspect of the present application there is provided an electronic device comprising a sound emitting apparatus as described in the first aspect.

The sound generating device provided by the embodiment of the application not only has excellent high-frequency acoustic performance, but also is easier to deform, larger in amplitude and better in vibration effect due to the special shape of the piezoelectric sheet, thereby being beneficial to improving the low-frequency acoustic performance of the sound generating device.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of a front view of a sound emitting device according to one embodiment of the present application;

FIG. 2a is a schematic perspective view of a sound emitting device according to one embodiment of the present application;

FIG. 2b is an enlarged schematic view at A in FIG. 2 a;

FIG. 3a is a schematic perspective view of a sound emitting device according to an embodiment of the present application;

fig. 3B is an enlarged schematic view at B in fig. 3 a.

Reference numerals illustrate:

1. the device comprises a sound generating device, 11, a piezoelectric sheet, 111, a first side, 112, a second side, 113, a third side, 114, a fourth side, 12, a connecting sheet, 13, a quality piece, 14 and a foam layer.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1-3 b, according to one embodiment of the present application, a sound generating apparatus 1 is provided. The sound generating device 1 comprises a piezoelectric sheet 11, a connecting sheet 12 and a mass piece 13, wherein the cross section of the piezoelectric sheet 11 along the direction perpendicular to the thickness direction comprises a first side 111, a second side 112, a third side 113 and a fourth side 114, the first side 111 and the second side 112 are oppositely arranged along the first direction, the first side 111 and the second side 112 are arc-shaped with equal radius, the third side 113 and the fourth side 114 are oppositely arranged along the second direction, the third side 113 and the fourth side 114 are linear, the diameter of the first side 111 is larger than the length of the third side 113, the piezoelectric sheet 11 is provided with a first surface arranged along the thickness direction, the connecting sheet 12 is connected with the first surface of the piezoelectric sheet 11, the mass piece 13 is located on one side of the connecting sheet 12 far from the piezoelectric sheet 11, and the mass piece 12 is connected with the flexible piece 12.

Referring to fig. 1, the first direction is the a direction in fig. 1, and the second direction is the b direction in fig. 1.

In the sound generating apparatus 1 provided in the embodiment of the present application, the vibration is transmitted from the piezoelectric sheet 11 to the connecting sheet 12 and then to the mass member 13. The piezoelectric sheet 11 is a core driving element of the sound generating device, and its cross section is designed into a special geometric shape, specifically includes a first side 111, a second side 112, a third side 113 and a fourth side 114, where the first side 111 and the second side 112 are opposite to each other along a first direction and are all in arc shapes with equal radius, and such design is helpful to generate uniform deformation when being stressed. The third side 113 and the fourth side 114 are disposed opposite to each other in a second direction perpendicular to the first direction, and are straight lines of equal length, ensuring stability of the piezoelectric sheet in a specific direction. Importantly, the diameter of the first side 111 (i.e., the diameter of the circular arc) is greater than the length of the third side 113, and such sizing optimizes the vibration effect of the piezoelectric patch. More specifically, the piezoelectric sheet 11 has a circular shape with the same arcuate structure removed on both sides, and the radius of the circular shape is the radius of the first side 111 and the second side 112, and the third side 113 and the fourth side 114 are chords of the circular shape that do not pass through the center of the circle. The piezoelectric sheet 11 is more likely to be deformed and have a larger amplitude than a circular structure, and thus is advantageous in improving the low-frequency acoustic performance of the acoustic device 1, and the piezoelectric sheet 11 is less likely to be in an anti-resonant vibration mode than a circular structure, thereby being advantageous in improving the high-frequency acoustic performance of the acoustic device 1. In addition, compared with the rectangular structure, the circular arc shapes of the first side 111 and the second side 112 of the piezoelectric sheet 11 extend more towards the outer side, so that better vibration effect is easier to generate, and the low-frequency acoustic performance of the sound generating device 1 is improved.

The piezoelectric sheet 11 also has a first surface disposed in the thickness direction thereof for connection with the connection sheet 12. The connection piece 12 is laminated and connected to the first surface of the piezoelectric piece 11, and functions to transmit vibration energy. The mass member 13 is located at a side of the connection piece 12 away from the piezoelectric sheet 11, and the connection piece 12 is connected with the mass member 13 by means of flexible connection, so that matching constraint can be reduced, and influence on vibration deformation of the piezoelectric sheet 11 and the connection piece 12 is prevented. The addition of the mass member 13 increases the total mass of the system, thereby generating a larger inertial force when the piezoelectric plate vibrates, and thus enhancing the sound-producing effect.

Further, the piezoelectric sheet 11 and the connecting sheet 12 are both in a sheet structure with thinner thickness, and optionally, the total thickness of the piezoelectric sheet 11 and the connecting sheet 12 is about 0.3mm, so that the piezoelectric sheet is very suitable for being applied to electronic products such as smart phones and the like. In addition, the matching mass piece of the driving assembly formed by hard bonding of the thinner piezoelectric sheet 11 and the connecting sheet 12 further ensures the low-frequency acoustic performance, and the resonance frequency of the driving assembly formed by the piezoelectric sheet 11 and the connecting sheet 12 is about 600 Hz. After the sound generating device 1 is mounted in the electronic product, the periphery of the connecting piece 12 is fixed with other components in the electronic product, such as the housing.

In summary, the sound generating device 1 provided by the embodiment of the application has small volume and small occupied space, and is beneficial to the miniaturization design of electronic products when being applied to the electronic products, and the sound generating device has excellent low-frequency acoustic performance and high-frequency acoustic performance.

Referring to fig. 1-3 b, in one embodiment, the ratio of the thickness of the piezoelectric sheet 11 to the thickness of the connecting sheet 12 is 2:1.

In this specific example, the ratio of the thickness of the piezoelectric sheet 11 to the thickness of the connecting sheet 12 is 2:1, and such a proportional design ensures that the piezoelectric sheet 11 can be sufficiently deformed and excite the piezoelectric effect when an external force is applied thereto, and the connecting sheet 12 can effectively transmit vibration. In addition, the proportional design ensures the reliability of the piezoelectric sheet 11 driving the connecting sheet 12 to vibrate, and avoids vibration energy loss caused by the fact that the connecting sheet is too thick. For example, the thickness of the piezoelectric sheet 11 is 0.2mm, the thickness of the connecting sheet 12 is 0.1mm, and the total thickness of the driving assembly composed of the piezoelectric sheet 11 and the connecting sheet 12 is about 0.3mm, which is beneficial to improving the low-frequency acoustic performance of the sound generating device.

Referring to fig. 1 to 3b, in one embodiment, the connecting piece 12 is made of a polymer material or a light foam metal.

In this specific example, the connecting piece 12 may be made of a polymer material or a light foam metal, and these materials have good flexibility and light characteristics, and can effectively transmit the vibration generated by the piezoelectric piece 11, while reducing the weight of the entire sound generating device. When the material of the connecting piece 12 is a light foam metal, its young's modulus is about 11 GPa.

Referring to fig. 1 to 3b, in one embodiment, along the thickness direction of the piezoelectric sheet 11, the projection of the piezoelectric sheet 11 is located within the projection range of the connection sheet 12.

In this particular example, along the thickness direction of the piezoelectric sheet 11, the projection of the piezoelectric sheet 11 is located within the projection range of the connection sheet 12, that is, the connection sheet 12 completely covers the piezoelectric sheet 11 and the edge of the connection sheet 12 protrudes beyond the edge of the piezoelectric sheet 11, thereby providing a certain elastic deformation space for the driving assembly composed of the piezoelectric sheet 11 and the connection sheet 12.

Referring to fig. 1 to 3b, in one embodiment, the connecting piece 12 is circular, and a central axis of the connecting piece 12 coincides with a central axis of the piezoelectric piece 11.

In this particular example, the circular connecting piece 12 is arranged coaxially with the quasi-circular piezoelectric piece 11, so that it is ensured that the driving assembly composed of the piezoelectric piece 11 and the connecting piece 12 can uniformly and stably vibrate and deform.

Referring to fig. 1-3 b, in one embodiment, the radius of the connecting tab 12 is at least 1mm greater than the radius of the first side 111.

In this particular example, the edge of the connection piece 12 is provided to protrude by a width of at least 1mm from the edge of the piezoelectric piece 11, thereby providing a sufficient elastic deformation space for the driving assembly composed of the piezoelectric piece 11 and the connection piece 12.

Referring to fig. 1-3 b, in one embodiment, the sound generating device further includes a foam layer 14, and the foam layer 14 is disposed between the mass member 13 and the connecting piece 12.

In this particular example, the foam layer 14 is used to achieve a flexible connection between the mass 13 and the connection piece 12, which further dampens and transmits vibrations, thereby ensuring reduced matching constraints and preventing impact on the vibration deformation of the piezoelectric sheet 11 and connection piece 12.

Referring to fig. 1-3 b, in one embodiment, the foam layer 14 has a thickness of greater than or equal to 0.1mm.

In this particular example, the foam layer 14 has a thickness greater than or equal to 0.1mm, which ensures flexibility of the foam layer 14 and avoids excessive absorption of vibrational energy. Optionally, the foam layer 14 is connected with the connecting piece 12 and the mass piece 13 through silica gel, so that the connection reliability can be ensured, and the silica gel does not have strong deformation resistance, so that the vibration deformation of the driving assembly formed by the piezoelectric sheet 11 and the connecting piece 12 is not affected.

Referring to fig. 1-3 b, in one embodiment, the mass member 13 is a layered structure, or the mass member 13 includes a plurality of mass blocks disposed at intervals.

In this specific example, the mass member 13 provides mass to the entire sound generating apparatus so as to reduce the initial resonance frequency, the thickness of the mass member 13 may be, for example, 0.3mm, and the density thereof may be about 3000[ kg/m ³ ], and the mass member 13 may be made of a polymer material such as fluororubber having a soft and high density as much as possible. The mass member 13 may be a single layered structure, or may be composed of a plurality of mass blocks arranged at intervals to adapt to different sounding requirements.

According to another embodiment of the present application, there is provided an electronic apparatus including the sound emitting device 1 as described above.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims (11)

1. A sound emitting device, the sound emitting device comprising:

The piezoelectric sheet (11), the cross section of the piezoelectric sheet (11) along the direction perpendicular to the thickness comprises a first side (111), a second side (112), a third side (113) and a fourth side (114), wherein the first side (111) and the second side (112) are oppositely arranged along the first direction, the first side (111) and the second side (112) are arc-shaped, the third side (113) and the fourth side (114) are oppositely arranged along the second direction, the third side (113) and the fourth side (114) are straight, and the piezoelectric sheet (11) is provided with a first surface which is arranged along the thickness direction;

a connection sheet (12), wherein the connection sheet (12) is connected to the first surface of the piezoelectric sheet (11) in a stacked manner;

The mass piece (13), the mass piece (13) is located the connection piece (12) keep away from one side of piezoelectricity piece (11), just mass piece (13) with flexible connection between connection piece (12).

2. The sound generating apparatus according to claim 1, wherein the first side (111) and the second side (112) are arc-shaped with equal radius, the third side (113) and the fourth side (114) are straight with equal length, and the diameter of the first side (111) is larger than the length of the third side (113).

3. 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 connecting sheet (12) is 2:1.

4. Sound generating device according to claim 1, characterized in that the material of the connecting piece (12) is a polymer material or a light foam metal.

5. Sound generating device according to claim 1, characterized in that the projection of the piezoelectric sheet (11) in the thickness direction of the piezoelectric sheet (11) is located within the projection range of the connecting sheet (12).

6. Sound generating device according to claim 5, characterized in that the connecting piece (12) is circular, the central axis of the connecting piece (12) coinciding with the central axis of the piezo-electric piece (11).

7. Sound emitting device according to claim 6, characterized in that the radius of the connecting piece (12) is at least 1mm larger than the radius of the first side edge (111).

8. The sound emitting device according to claim 1, further comprising a foam layer (14), the foam layer (14) being arranged between the mass (13) and the connecting piece (12).

9. The sound emitting device according to claim 8, characterized in that the foam layer (14) has a thickness of greater than or equal to 0.1mm.

10. The sound generating apparatus according to claim 1, characterized in that the mass member (13) is of a layered structure, or that the mass member (13) comprises a plurality of spaced apart mass blocks.

11. An electronic device, characterized in that the electronic device comprises a sound emitting arrangement (1) as claimed in any one of claims 1-10.