阅读说明：本技术 扬声器 (Loudspeaker ) 是由 程诗阳 但强 周一苇 沈宇 李杨 于 2021-09-28 设计创作，主要内容包括：本发明提供一种扬声器,其包括具有收容腔的底座以及收容于收容腔内的振动发声组件,振动发声组件包括固定于底座的第一振膜和第二振膜、以及固定于第一振膜以驱动第一振膜和所述第二振膜振动发声的驱动器；其中,第二振膜叠设在第一振膜上,并且,第二振膜与第一振膜的刚度不同。本发明的扬声器架构实现了将驱动结构和位移结构的深度解耦,驱动器只负责产生面内应力,自身不发生面外翘曲,使扬声器的振动极大程度的摆脱驱动器自身性能的影响,很容易获得全频段高水平的声压输出。另外,本发明的扬声器中第一振膜和第二振膜可以任意选择刚度搭配材料,在同样的驱动力下可以优化出最大翘曲位移方案,使扬声器性能收益最大化。(The invention provides a loudspeaker, which comprises a base with an accommodating cavity and a vibration sounding assembly accommodated in the accommodating cavity, wherein the vibration sounding assembly comprises a first vibrating diaphragm and a second vibrating diaphragm which are fixed on the base, and a driver which is fixed on the first vibrating diaphragm and drives the first vibrating diaphragm and the second vibrating diaphragm to vibrate and sound; the second vibrating diaphragm is stacked on the first vibrating diaphragm, and the second vibrating diaphragm and the first vibrating diaphragm are different in rigidity. The loudspeaker framework realizes the deep decoupling of the driving structure and the displacement structure, and the driver is only responsible for generating in-plane stress and does not generate out-of-plane warping, so that the vibration of the loudspeaker is greatly free from the influence of the performance of the driver, and the full-band high-level sound pressure output is easily obtained. In addition, the first vibrating diaphragm and the second vibrating diaphragm in the loudspeaker can be made of rigidity matching materials at will, and a maximum warping displacement scheme can be optimized under the same driving force, so that the performance benefit of the loudspeaker is maximized.)

1. A loudspeaker comprises a base with an accommodating cavity and a vibration sounding component accommodated in the accommodating cavity, and is characterized in that the vibration sounding component comprises a first vibrating diaphragm, a second vibrating diaphragm and a driver fixed on the first vibrating diaphragm to drive the first vibrating diaphragm and the second vibrating diaphragm to vibrate and sound; the second diaphragm is stacked on the first diaphragm, and the second diaphragm and the first diaphragm have different rigidities.

2. A loudspeaker according to claim 1, wherein the first diaphragm is provided with a through hole along a thickness direction thereof, and the driver is inserted into the through hole.

3. The loudspeaker of claim 1, wherein the driver is fixed to an upper surface or a lower surface of the first diaphragm.

4. A loudspeaker according to claim 3, wherein the second diaphragm is disposed on the same side of the first diaphragm as the driver.

5. A loudspeaker as claimed in claim 3, characterized in that the second diaphragm is arranged on a different side of the first diaphragm than the driver.

6. The loudspeaker of any one of claims 1 to 5, wherein the second diaphragm comprises a plurality of sub-diaphragms;

the multilayer sub-diaphragms are stacked on the same side of the first diaphragm; or the plurality of layers of sub-diaphragms are stacked on different sides of the first diaphragm.

7. A loudspeaker according to any one of claims 1 to 5, wherein the first diaphragm has a stiffness less than the stiffness of the driver.

8. A loudspeaker according to any one of claims 1 to 5, wherein the stiffness of the driver is distributed symmetrically along its central axis.

9. A loudspeaker according to any one of claims 1 to 5, wherein the stiffness of the driver is distributed evenly.

10. A loudspeaker as claimed in claim 3, characterized in that the driver is fixed to the first diaphragm by gluing.

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a loudspeaker.

Background

The speaker is widely applied to personal terminals and intelligent electronic equipment, and is mainly used for converting an electric signal into a sound signal. The traditional loudspeaker usually adopts a moving coil structure, and although the traditional loudspeaker has very excellent low-frequency performance, the high-frequency listening feeling has obvious defects. Meanwhile, the production efficiency of the assembly structure adopted by the traditional loudspeaker is obviously restricted, and the production cost is correspondingly improved.

In view of the above problems, players in the market are trying to develop Micro-speakers based on MEMS (Micro-Electro-Mechanical System), which are mainly based on a piezoelectric driving mode, and adopt MEMS technology to effectively improve efficiency and rapidly expand productivity. Meanwhile, good high-frequency performance can be obtained through controlling the mode of the piezoelectric driver.

However, in the existing MEMS speaker structure, the decoupling of the driving structure and the displacement structure is not achieved, and therefore the driving structure needs to simultaneously take over the functions of providing power and displacement. The two components are mutually restricted, and the vibration displacement of the loudspeaker is greatly limited, so that the further optimization of the overall performance of the loudspeaker cannot be realized.

Therefore, it is necessary to provide a new speaker to solve the above technical problems.

Disclosure of Invention

The present invention is directed to at least one of the problems of the prior art, and provides a speaker.

The invention provides a loudspeaker, which comprises a base with an accommodating cavity and a vibration sounding component accommodated in the accommodating cavity, wherein the vibration sounding component comprises a first vibrating diaphragm, a second vibrating diaphragm and a driver fixed on the first vibrating diaphragm to drive the first vibrating diaphragm and the second vibrating diaphragm to vibrate and sound; the second diaphragm is stacked on the first diaphragm, and the second diaphragm and the first diaphragm have different rigidities.

Optionally, the first diaphragm is provided with a through hole along a thickness direction thereof, and the driver is inserted into the through hole.

Optionally, the driver is fixed to an upper surface or a lower surface of the first diaphragm.

Optionally, the second diaphragm and the driver are disposed on the same side of the first diaphragm.

Optionally, the second diaphragm and the driver are disposed on different sides of the first diaphragm.

Optionally, the second diaphragm includes a plurality of sub-diaphragms;

the multilayer sub-diaphragms are stacked on the same side of the first diaphragm; or the plurality of layers of sub-diaphragms are stacked on different sides of the first diaphragm.

Optionally, the stiffness of the first diaphragm is smaller than the stiffness of the driver.

Optionally, the stiffness of the driver is symmetrically distributed along its central axis.

Optionally, the stiffness of the driver is evenly distributed.

Optionally, the driver is fixed to the first diaphragm by gluing.

In the loudspeaker, the vibration generating component comprises two vibrating diaphragms, wherein the first vibrating diaphragm is equivalent to a transmission structure, a driver and a second vibrating diaphragm are fixed on the first vibrating diaphragm, an in-plane stretching effect is generated by receiving in-plane stress generated by the driver, and the second vibrating diaphragm restrains the in-plane stretching of the first vibrating diaphragm to generate out-of-plane warping based on different rigidity of the first vibrating diaphragm and the second vibrating diaphragm so as to drive the whole system to vibrate out of plane. The loudspeaker framework realizes the deep decoupling of the driving structure and the displacement structure, and the driver is only responsible for generating in-plane stress and does not generate out-of-plane warping, so that the vibration of the loudspeaker is greatly free from the influence of the performance of the driver, and the full-band high-level sound pressure output is easily obtained.

Drawings

Fig. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention;

FIG. 2 is a schematic view of the out-of-plane motion of a speaker according to another embodiment of the present invention;

fig. 3 is a cross-sectional view of a speaker according to another embodiment of the present invention;

fig. 4 is a sectional view of a speaker according to another embodiment of the present invention;

fig. 5 is a sectional view of a speaker according to another embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 5, the present invention provides a speaker 100, which includes a base 110 having a receiving cavity and a vibration and sound generating assembly received in the receiving cavity, wherein the vibration and sound generating assembly includes a first diaphragm 120 and a second diaphragm 130 fixed to the base 110, and a driver 140 fixed to the first diaphragm 120 for driving the first diaphragm 120 and the second diaphragm 130 to generate sound by vibration; the second diaphragm 130 is stacked on the first diaphragm 120, and the second diaphragm 130 has different stiffness from the first diaphragm 120, and the projections of the second diaphragm 130 and the driver 140 on the first diaphragm 120 do not overlap.

Referring to fig. 1 and 2, based on the above-mentioned structure, if a dynamic input carrying an audio signal is applied to the driver 140, the driver 140 receives the audio driving signal to generate an in-plane stress strain (refer to the horizontal arrow direction in fig. 1 and 2) and transmits the stress strain to the first diaphragm 120, and the first diaphragm 120 generates an in-plane expansion effect by receiving the stress strain transmitted by the driver 140 and transmits the in-plane expansion to the second diaphragm 130, and at the same time, the second diaphragm 130 stacked on the first diaphragm 120 generates a suppression effect on the in-plane expansion of the first diaphragm 120, that is, the second diaphragm 130 restrains the in-plane expansion of the first diaphragm 120, and the second diaphragm 130 warps with the first diaphragm 120 out-of-plane due to the mismatch between the stiffness of the second diaphragm 130 and the stiffness of the first diaphragm 120 (refer to the upward bending arrow direction in fig. 2), under the driving of the out-of-plane warp displacement, the driver 140 also performs out-of-plane up-and-down vibration, that is, the whole structure performs reciprocating out-of-plane vibration, and restores an audio signal. That is to say, the first diaphragm of this example is equivalent to a transmission structure, and completely decouples force and displacement, and the driver is only responsible for generating in-plane stress, and does not warp itself, and is equivalent to a driving structure. And the first vibrating diaphragm and the second vibrating diaphragm form a composite warping layer, which is equivalent to a displacement structure.

It should be noted that the structure of the base is not limited in this example, and for example, the base has a ring structure, and in some embodiments, the base may have a circular ring structure, and of course, in other embodiments, the base may also have a triangular ring structure or another polygonal ring structure.

Specifically, as shown in fig. 1 to 5, the base 110 includes a sidewall enclosing a receiving cavity, and the first diaphragm 120 and the second diaphragm 130 are fixed on the sidewall. That is, the base 110 surrounds the periphery of the vibration and sound generating component, and plays a role in fixing and supporting the first diaphragm 120 and the second diaphragm 130.

It should be further noted that, in the present embodiment, specific architectures among the driver, the first diaphragm, and the second diaphragm in the vibration and sound generating component are not specifically limited, as long as the decoupling of the force and the displacement by the first diaphragm can be achieved.

Specifically, in some embodiments, as shown in fig. 1, the first diaphragm 120 is provided with a through hole along a thickness direction thereof, the driver 140 is inserted into the through hole, and the second diaphragm 130 is stacked on an upper surface of the first diaphragm 120. That is, the first diaphragm of this example extends from the edge of the driver toward the base sidewall.

It should be understood that, in other embodiments, the first diaphragm is provided with a through hole along the thickness direction thereof, the driver is arranged in the through hole in a penetrating manner, and the second diaphragm may also be stacked on the lower surface of the first diaphragm, which is not particularly limited.

Further, in other embodiments, as shown in fig. 3 and 4, the driver 140 may also be fixed to the upper surface or the lower surface of the first diaphragm 120 by gluing, i.e., the driver 140 may span the first diaphragm 120.

Since the driver of this example is fixed to the surface of the first diaphragm, the second diaphragm and the driver may be disposed on the same side of the first diaphragm, and of course, the second diaphragm and the driver may also be disposed on different sides of the first diaphragm.

Specifically, referring to fig. 3, in some embodiments, the driver 140 is fixed on the upper surface of the first diaphragm 120, and the second diaphragm 130 is also stacked on the upper surface of the first diaphragm 120.

Specifically, referring to fig. 4, in other embodiments, the driver 140 is fixed on the lower surface of the first diaphragm 120, and the second diaphragm 130 is stacked on the upper surface of the first diaphragm 120.

It should be understood that in other embodiments, the positional relationship of the structures in the sound-generating driving assembly may be modified, for example, such that the driver is fixed to the upper surface of the first diaphragm and the second diaphragm is stacked on the lower surface of the first diaphragm. For another example, the driver is fixed to the lower surface of the first diaphragm, and the second diaphragm is stacked on the lower surface of the first diaphragm.

It should be noted that the second diaphragm of this example may have a one-layer structure, or may have a multi-layer stacked structure. For example, the second diaphragm may include multiple sub-diaphragms stacked on the same side of the first diaphragm, or multiple sub-diaphragms stacked on different sides of the first diaphragm.

Specifically, as shown in fig. 5, the second diaphragm 130 includes a first layer of sub-diaphragm 131 and a second layer of sub-diaphragm 132, where the first layer of sub-diaphragm 131 is stacked on the upper surface of the first diaphragm 120, and the second layer of sub-diaphragm 132 is stacked on the lower surface of the first diaphragm 120. Of course, in other embodiments, the two sub-diaphragms may be stacked on the upper surface of the first diaphragm, or the two sub-diaphragms may be stacked on the lower surface of the first diaphragm.

It should be further noted that the first diaphragm of this example may also be a single-layer structure, and may also be a multi-layer structure, which is not particularly limited.

It should still be noted that, since the main function of the first diaphragm is to transmit the stress strain provided by the driver, the overall stiffness of the first diaphragm should not be too great, which may cause the transmission of the stress strain to be hindered.

In particular, in some preferred embodiments, the stiffness of the first diaphragm as a whole is at least less than the overall stiffness of the driver.

It should be noted that, on the premise that the first diaphragm stiffness and the second diaphragm stiffness are different, the first diaphragm and the second diaphragm may be made of materials with matched stiffness, and the scheme of maximum warpage displacement may be optimized under the same driving force, so that the performance gain of the speaker is maximized.

Further, the stiffness of the present example driver should also be reasonably configured, and it should be understood that the overall stiffness of the driver should not be too great to produce sufficient out-of-plane displacement. Of course, the overall stiffness of the drive cannot be too low to prevent arching of the drive itself.

Specifically, in some embodiments, the stiffness of the driver is evenly distributed. Alternatively, in other embodiments, the stiffness of the driver is symmetrically distributed along its central axis, which may prevent warping of the driver itself due to its internal non-uniform stiffness while it provides the driving force.

It should be noted that the driver of this example is a single block, but in practice it should be considered as a "black box", i.e. a functional body comprising multiple layers of complex structures, such as electrodes, functional layers, etc., which may comprise multiple layers, multiple materials, or even complex spatial structures, but which is overall a structural module having the function of generating in-plane stress and transmitting it to the first diaphragm.

In particular, the actuator may be a piezoelectric transducer including a piezoelectric layer and metal electrodes respectively attached to opposite sides of the piezoelectric layer. Of course, the driver may also be an electrostatic transducer or an electromagnetic transducer, which is not particularly limited.

Compared with the prior art, the loudspeaker provided by the invention has the advantages that the vibration generation assembly comprises two vibrating diaphragms, wherein the first vibrating diaphragm is equivalent to a transmission structure, the first vibrating diaphragm is fixedly provided with the driver, the second vibrating diaphragm is also provided, the in-plane stretching effect is generated by receiving the in-plane stress generated by the driver, and the second vibrating diaphragm restrains the in-plane stretching of the first vibrating diaphragm to generate out-of-plane warping based on the different rigidity of the first vibrating diaphragm and the second vibrating diaphragm so as to drive the whole system to vibrate out of plane. The integral framework of the loudspeaker realizes the deep decoupling of the driving structure and the displacement structure, and the driver is only responsible for generating in-plane stress and does not generate out-of-plane warping, so that the vibration of the loudspeaker is greatly free from the influence of the performance of the driver, and the full-band high-level sound pressure output is easily obtained. In addition, the first vibrating diaphragm and the second vibrating diaphragm in the loudspeaker can be made of rigidity matching materials at will, and a maximum warping displacement scheme can be optimized under the same driving force, so that the performance benefit of the loudspeaker is maximized.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.