A speaker module

Abstract

A speaker module is disclosed, the speaker module includes a spring piece, a diaphragm assembly, a driving assembly and a basin frame, the spring piece also includes an external fixing part, a central spring piece located inside the external fixing part, and a connecting arm connecting the external fixing part and the central spring piece, the external fixing part is connected to the basin frame, the central spring piece is connected to the driving assembly, and a transmission member is also connected to the central spring piece, and the diaphragm assembly is connected to the transmission member, the driving assembly is controlled to drive the central spring piece and the connecting arm to vibrate, and the diaphragm assembly is driven to vibrate synchronously through the transmission member to produce sound, and a counterweight is also connected to the connecting arm, and the compliance of the connecting arm and / or the weight of the counterweight are used to adjust the output characteristics of the vibration sound. The speaker module of the present invention adjusts the output characteristics by the spring piece and the counterweight, is easy to implement in a thin space, and improves the low-frequency response performance while ensuring the quality of mid- and high-frequency playback, thereby improving the full-band sound playback quality of the speaker.

Description

[0001] This application claims priority to Chinese patent application No. 202110097689.4, filed on January 25, 2021, and entitled “A Speaker Module”, the entire contents of which are incorporated by reference into the application herein. Technical Field

[0002] The invention relates to the field of electroacoustic conversion, and specifically designs a loudspeaker module. Background Art

[0003] The existing speaker modules are limited by the spatial design of the voice coil and magnetic circuit system, and it is difficult to ensure that the best acoustic performance is achieved while meeting the thickness requirements. The diaphragm is prone to swing and roll when vibrating with a large amplitude, which affects the speaker performance. Piezoelectric speakers can guarantee a certain level of mid- and high-frequency sound reproduction, but the low-frequency performance is poor. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a speaker module that can achieve large-amplitude vibration of the diaphragm in a thin space without swaying or rolling of the diaphragm, thereby ensuring the reproduction of high-frequency sounds in the speaker while enhancing the low-frequency response.

[0005] An embodiment of the present invention provides a speaker module, comprising:

[0006] basin stand;

[0007] The spring piece comprises an outer fixing part, a connecting arm and a central spring piece, wherein the outer fixing part is arranged on the basin frame, the central spring piece is located inside the outer fixing part, the connecting arm connects the outer fixing part and the central spring piece, and a transmission member is also arranged on the central spring piece;

[0008] a diaphragm assembly connected to the transmission member; and

[0009] A driving assembly connected to the central spring sheet, the driving assembly being configured to controllably drive the central spring sheet and the connecting arm to vibrate, thereby driving the diaphragm assembly to vibrate synchronously and generate sound through the transmission member;

[0010] Wherein, a counterweight is also connected to the connecting arm, and the compliance of the connecting arm and / or the weight of the counterweight is used to adjust the output characteristics of the vibration sound generation.

[0011] Furthermore, the outer fixing portion is annular, and the central elastic sheet is long sheet-shaped;

[0012] The connecting arm comprises:

[0013] A connecting portion connected to the central elastic sheet, and the counterweight is connected to the connecting portion; and

[0014] At least one cantilever, two ends of each cantilever are respectively connected to the inner periphery of the outer fixing portion and the connecting portion.

[0015] Furthermore, the cantilever is wavy in shape.

[0016] Further, the central elastic piece includes a first end and a second end;

[0017] The first end is connected to the transmission member;

[0018] The second end is connected to the connecting portion.

[0019] Furthermore, the transmission member is columnar and fixedly penetrates the first end;

[0020] The first end of the central elastic sheet extends from the connecting portion toward the center of the diaphragm assembly, and the transmission member is connected to the center of the diaphragm assembly.

[0021] Furthermore, the diaphragm assembly comprises:

[0022] A diaphragm, comprising a central portion and a folded ring arranged around the central portion, wherein a transmission member is connected to the central portion; and

[0023] The spherical top is connected to the central part.

[0024] Furthermore, the cross section of the fold ring is arc-shaped or S-shaped.

[0025] Furthermore, the driving assembly comprises:

[0026] A piezoelectric ceramic sheet connected to the central spring sheet; and

[0027] A circuit board is connected to the piezoelectric ceramic sheet, and the circuit board is configured to receive an alternating current signal to drive the piezoelectric ceramic sheet to deform and then drive the diaphragm assembly to vibrate.

[0028] Furthermore, at least one leakage hole is provided on the basin frame, and the leakage hole is covered with a gauze.

[0029] Furthermore, two of the spring sheets and two of the driving assemblies are provided, and each set of the spring sheets and the driving assemblies is connected to the diaphragm assembly via one of the transmission members.

[0030] The speaker module of the embodiment of the present invention adjusts the output characteristics through springs and counterweights, is easy to implement in a thin space, and improves the low-frequency response performance while ensuring the quality of mid- and high-frequency playback, thereby improving the full-band sound playback quality of the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0032] Figure 1 is an isometric diagram of a speaker module according to a first embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view taken along line AA of a speaker module according to a first embodiment of the present invention;

[0034] Figure 3 An exploded view of a speaker module according to a first embodiment of the present invention;

[0035] Figure 4 A three-dimensional diagram of a spring piece and a transmission member according to a first embodiment of the present invention;

[0036] Figure 5 is an isometric view of a diaphragm assembly according to a first embodiment of the present invention;

[0037] Figure 6 A top view of another spring piece according to the first embodiment of the present invention;

[0038] Figure 7 A top view of another spring piece according to the first embodiment of the present invention;

[0039] Figure 8 is a cross-sectional view of a speaker module according to a second embodiment of the present invention;

[0040] Fig. 9 FIG. 4 is a cross-sectional view of a speaker module according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0042] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0043] At the same time, it should be understood that in the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between the elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0044] Unless the context clearly requires otherwise, words such as “include”, “including” and the like in the specification should be interpreted as including rather than being exclusive or exhaustive; that is, as including but not limited to “including”.

[0045] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0046] Figure 1-Figure 5 FIG. 1 is a schematic diagram of a speaker module according to a first embodiment of the present invention. Figure 1-Figure 3 As shown, the speaker module includes a spring piece 1, a diaphragm assembly 2, a driving assembly 3 and a basin frame 4. The spring piece 1 includes an external fixing portion 11, a central spring piece 13 located inside the external fixing portion 11, and a connecting arm 12 connecting the external fixing portion 11 and the central spring piece 13. The external fixing portion 11 is connected to the basin frame 4, the central spring piece 13 is connected to the driving assembly 3, and a transmission member 1311 is also provided on the central spring piece 3, and the transmission member 1311 is connected to the diaphragm assembly 2. The driving assembly 3 drives the central spring piece 13 to vibrate in a controlled manner, and drives the diaphragm assembly 2 to vibrate synchronously and produce sound through the transmission member 1311. The vibration of the central spring piece 13 also drives the connecting arm 12 connected thereto to vibrate synchronously, and a counterweight 1211 is connected to the connecting arm 12. The compliance of the connecting arm 12 and / or the weight of the counterweight 1211 can adjust the vibration parameters of the diaphragm assembly 2, thereby improving the sound reproduction quality of the speaker module.

[0047] The spring 1 can be made of a material with certain toughness and elongation, such as metal or polymer material. The spring 1 has a certain compliance, which refers to the softness of the spring 1. When vibrating, the different compliances of the spring 1 make the vibration system have different eigenfrequencies. Specifically, the spring 1, the transmission member 1311 and the diaphragm assembly 2 form a vibration system, and the eigenfrequencies F0 of the vibration system are:

[0048]

[0049] Among them, M msis the weight of the vibration system, C ms It is not difficult to understand that the eigenfrequency of the vibration system is inversely proportional to the weight and compliance of the vibration system, that is, the greater the weight of the vibration system or the greater the compliance, the lower the eigenfrequency value of the vibration system.

[0050] Since the outer fixing part 11 of the spring sheet 1 is fixedly connected to the basin frame 4, the outer fixing part 11 does not follow the vibration. The vibration of the vibration system can be divided into two parts, one of which (hereinafter referred to as the first vibration system) is the vibration of the connecting arm 12 and the counterweight 1211 on the connecting arm 12, and the other (hereinafter referred to as the second vibration system) is the vibration of the central spring sheet 13, the transmission member 1311 on the central spring sheet 13, and the vibration of the diaphragm assembly 2 driven by the transmission member 1311. The amplitude of the vibration system is formed by the superposition of the partial amplitudes of the two parts of vibration.

[0051] The connecting arm 12 adopts a special structural design and / or material to improve compliance, and adds a counterweight 1211, so that the compliance and weight of the first vibration system are improved, thereby obtaining a lower resonant frequency. That is, the eigenfrequency of the first vibration system including the connecting arm 12 and the counterweight 1211 is lower than the resonant frequency of the second vibration system including the central spring 13, the transmission member 1311 and the diaphragm assembly 2.

[0052] When the vibration frequency input by the driving component 3 is near the resonant frequency of the first vibration system, for example, the driving component 3 may include piezoelectric ceramics, then when the frequency of the AC signal input to the piezoelectric ceramics is near the resonant frequency of the first vibration system, the connecting arm 12 begins to resonate and generate a large amplitude. At this time, the frequency of the vibration of the diaphragm component 2 driven by the transmission member 1311 is composed of two parts, namely, the deformation vibration generated by the first vibration system driven by the driving component 3 and resonance, and the deformation vibration generated by the second vibration system driven by the driving component 3. The two vibrations have the same phase, the vibrations are superimposed, and the amplitude after superposition becomes larger. The vibration is transmitted to the diaphragm component 2 by the transmission member 1311, so that the diaphragm component 2 generates a large vibration displacement near the resonant frequency of the first vibration system, so that the speaker module has a high frequency response and improved sensitivity near the frequency point. Therefore, by adjusting the shape, quantity, material of the connecting arm 12, and / or the weight of the counterweight 1211, the amplitude near the low-frequency resonant frequency point can be adjusted, and the frequency point position and amplitude of the low-frequency response enhancement of the speaker module can be adjusted accordingly, thereby improving the full-band output characteristics of the speaker module.

[0053] like Figure 4As shown, in this embodiment, the outer fixing part 11 is annular and hollow in the middle. The central elastic piece 13 is in the shape of a long sheet, including a first end 131 and a second end 132, and the transmission member 1311 is fixedly connected to the first end 131, and the central elastic piece 13 is located on the inner side of the outer fixing part 11 and is spaced apart from the outer fixing part 11. The connecting arm 12 includes a connecting part 121 and two cantilevers 122. Among them, the connecting part 121 is in the shape of a rectangular sheet, and the length and width of the rectangular sheet are not much different, approximately square, and the middle of one side of the connecting part 121 is connected to the second end 132 of the central elastic piece 13. The two ends of each cantilever 122 are respectively connected to the inner periphery of the outer fixing part 11 and the connecting part 121. More specifically, the positions where the two cantilevers 122 in this embodiment are connected to the connecting part 121 are at the two ends of the side where the connecting part 121 is connected to the central elastic piece 13. Therefore, when driven by the driving assembly 3 , the central elastic piece 13 can drive the connecting arm 12 , the transmission member 1311 and the diaphragm assembly 2 to vibrate.

[0054] In some other optional implementations, the number of cantilevers 122 may be one, or two or more, and the position where the cantilever 122 is connected to the connecting portion 121 may also be any position on the connecting portion 121. Thus, the same effect can be achieved, and this embodiment does not limit this.

[0055] In this embodiment, if Figure 4 As shown, the cantilever 122 is wavy. It should be understood that in some other optional implementations, the cantilever 122 can be of any shape, for example, Figure 6 and Figure 7 As shown, the cantilever 122 can be a rectangular strip or a curved line. The spring 1 has different compliances through the shape setting, and the shape of the cantilever 122 can be adjusted according to the output requirements of the speaker module, so that the spring 1 can better adjust the characteristics of the speaker module.

[0056] In this embodiment, if Figure 2 and Figure 3 As shown, the counterweight 1211 is connected to the connecting portion 121. It should be understood that in some other optional implementations, the counterweight 1211 can also be set on the cantilever 122, or on the connecting portion 121 and the cantilever 122, thereby achieving the same effect, which is not limited in this embodiment.

[0057] like Figure 2-Figure 4As shown, in this embodiment, the projection of the connection part 121 on the diaphragm assembly 2 is spaced from the center of the diaphragm assembly 2, and the first end 131 of the center spring 13 extends from the connection part 121 toward the center of the diaphragm assembly 2. The transmission member 1311 is columnar and fixedly penetrates the first end 131 of the center spring 13. The upper end of the transmission member 1311 extends out of the upper end surface of the center spring 13 and is connected to the center of the diaphragm assembly 2. As a result, the transmission member 1311 drives the central area of ​​the diaphragm assembly 2 to vibrate, thereby driving the entire diaphragm assembly 2 to vibrate, so that the vibration of the diaphragm assembly 2 is more uniform.

[0058] In some other optional implementations, the transmission member 1311 may also be rod-shaped, cone-shaped or table-shaped, and the transmission member 1311 may also be connected to other positions other than the center of the diaphragm assembly 2, thereby achieving the same effect, which is not limited in this embodiment.

[0059] like Figure 2 and Figure 3 As shown, in this embodiment, the driving assembly 3 includes a piezoelectric ceramic sheet 31 and a circuit board 32. The piezoelectric ceramic sheet 31 is connected to the central spring piece 13, and the circuit board 32 is connected to the piezoelectric ceramic sheet 31. A connecting line (not shown in the figure) is also led out from the circuit board 32, and the connecting line can be led out through the gap on the basin frame 4 and connected to an external control terminal (not shown in the figure). The control terminal inputs an AC signal of a predetermined frequency to the circuit board 32 to drive the piezoelectric ceramic sheet 31 to periodically expand and contract, thereby driving the central spring piece 13 and the diaphragm assembly 2 to vibrate. The frequency of the vibration of the diaphragm assembly 2 is related to the frequency of the AC signal input by the control terminal, and the vibration frequency of the diaphragm assembly 2 can be adjusted by the control terminal.

[0060] The piezoelectric ceramic sheet 31 may be glued to the lower end surface of the central spring sheet 13. The circuit board 32 may be a flexible circuit board and glued to the lower end surface of the piezoelectric ceramic sheet 31. The control terminal may be a computer.

[0061] The piezoelectric drive method has precise driving, stable vibration, low rolling vibration tendency and good high-frequency positioning effect, making the output characteristics of the speaker module more stable. It should be understood that in some other optional implementations, the driving component 3 can also include a voice coil and a magnetic circuit system, that is, an electromagnetically driven speaker module. Therefore, the low-frequency response of the speaker module can also be enhanced based on the structure of the spring 1, and the full-band output performance of the speaker module can be improved.

[0062] like Figure 2 and Figure 5As shown, in this embodiment, the diaphragm assembly 2 includes a diaphragm 21 and a dome 22. The diaphragm 21 includes a central portion 211 and a folded ring 212 arranged around the central portion 211, the transmission member 1311 is connected to the lower end surface of the central portion 211, and the dome 22 is connected to the upper end surface of the central portion 211. The folded ring 212 is used to vibrate and sound together with the central portion 211, and the dome 22 is used to enhance the local stiffness of the diaphragm 21 and optimize the vibration effect.

[0063] It is worth noting that in this embodiment, Figure 2 and Figure 5 As shown, the fold ring 212 is formed in an arc shape and is substantially on the same horizontal line as the central portion 211 .

[0064] like Figure 2 and Figure 3 As shown, in this embodiment, the speaker module further includes a support member 5, which is a frame-shaped structure, and its shape and size match the outer edge of the basin frame 4. The support member 5 is arranged on the basin frame 4, and its lower end surface is pressed and clamped with the basin frame 4 to clamp the outer fixing portion 11 of the spring sheet 1, so as to fix the spring sheet 1 to the basin frame 4; the upper end surface thereof is connected with the diaphragm 21, specifically, it is easy to understand that the outer edge of the folding ring 212 of the diaphragm 21 is also frame-shaped, or ring-shaped, and can be connected to the support member 5.

[0065] The outer edge of the diaphragm 21 is fixedly connected to the support member 5, and the central area is fixedly connected to the transmission member 1311, so that it can vibrate and produce sound under the drive of the transmission member 1311. In addition, it is easy to understand that the basin frame 4 is a structure similar to the outer shell, the spring piece 1 and the driving assembly 3 are both located inside the basin frame 4, the diaphragm assembly 2 is connected to one side of the basin frame 4, and the support member 5 is used to support and fix the internal structure together with the basin frame 4.

[0066] like Figure 2 and Figure 3 As shown, in this embodiment, a leakage hole 41 is provided on each side of the bottom of the basin frame 4, and the leakage hole 41 is covered with a gauze 411, and the gauze 411 can be glued to the basin frame 4 by gluing the edges. The leakage hole 41 is used to balance the air pressure inside and outside the speaker module to prevent the performance of the diaphragm assembly 2 from being unbalanced under long-term vibration, and the gauze 411 is used to prevent dust from inside the speaker module. The bottom refers to the other side of the basin frame 4 opposite to the side connected to the diaphragm assembly 2. The leakage hole 41 is provided at the bottom to avoid other components to avoid mutual influence.

[0067] It should be understood that the leakage hole 41 may also be provided at other positions of the basin frame 4, such as the side, and the number of the leakage hole 41 may be one, or two or more, which is not limited in the present embodiment.

[0068] The speaker module shrapnel and counterweight adjustment output characteristics of this embodiment are easy to implement in a thin space, and while ensuring the quality of mid- and high-frequency playback, the low-frequency response performance is improved, thereby improving the full-band sound playback quality of the speaker.

[0069] Figure 8 FIG. 2 is a cross-sectional view of a speaker module according to a second embodiment of the present invention. Figure 8 As shown, Figure 8 The cutting direction is the same as the cutting direction of the AA section of the speaker module of the first embodiment of the present invention. The difference between the speaker module in this embodiment and the speaker module in the first embodiment is that the dome structure and the folding ring structure of the speaker module in this embodiment are different, and the other structures are the same as those of the speaker module in the first embodiment.

[0070] like Figure 8 As shown, in this embodiment, the fold ring 212 is formed in an S shape, and there is a significant height difference between it and the central part 211; and the area of ​​the dome 22 is increased (not shown) to increase the vibration area and improve the sensitivity of the speaker module. The fold ring 212 with an S-shaped cross section and the large dome design significantly increase the amplitude of the diaphragm assembly 2 when vibrating, further increasing the frequency response of the speaker module.

[0071] In addition, in this embodiment, in order to match the height difference brought about by the S-shaped folding ring 212 , the longitudinal dimension of the transmission member 1311 can be appropriately increased so that the transmission member 1311 can still be connected to the diaphragm assembly 2 .

[0072] Figure 3 FIG. 4 is a cross-sectional view of a speaker module according to a third embodiment of the present invention. Fig. 9 As shown, Fig. 9 The cutting direction is the same as the cutting direction of the AA section of the speaker module of the first embodiment of the present invention. The difference between the speaker module in this embodiment and the speaker module in the first embodiment is that it includes two groups of springs 1 and drive components 3, and each group of springs 1 and drive components 3 is connected to the diaphragm component 2 through a transmission member 1311.

[0073] In this embodiment, the structure of each component and the connection method between each component can be the same as the speaker module of the first embodiment. Fig. 9 As shown, two groups of springs 1 and driving components 3 can be symmetrically arranged on both sides of the basin frame 4. The arrangement of the two groups of driving units enhances the driving effect of the speaker module and further improves the full-band sound reproduction of the speaker module.

[0074] The loudspeaker module of the present invention has good sound reproduction quality in all frequency bands and can be applied to sound reproduction in various frequency bands.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A speaker module, characterized in that: include: Basin stand (4); A spring piece (1), comprising an outer fixing portion (11), a connecting arm (12) and a central spring piece (13); the outer fixing portion (11) is arranged on the basin frame (4); the central spring piece (13) is located inside the outer fixing portion (11); and a transmission member (1311) is further arranged on the central spring piece (13); the outer fixing portion (11) is annular; the central spring piece (13) is long; the connecting arm (12) comprises a connecting portion (121) and at least one cantilever (122); the connecting portion (121) is connected to the central spring piece (13); and the two ends of each cantilever (122) are respectively connected to the inner periphery of the outer fixing portion (11) and the connecting portion (121); A diaphragm assembly (2) connected to the transmission member (1311); and A driving assembly (3) connected to the central spring sheet (13), the driving assembly (3) being configured to controllably drive the central spring sheet (13) and the connecting arm (12) to vibrate, thereby driving the diaphragm assembly (2) to vibrate synchronously and produce sound through the transmission member (1311); The connecting portion (121) is also connected to a counterweight (1211), the compliance of the connecting arm (12) is adjusted by changing the shape of the cantilever (122), and the compliance of the connecting arm (12) and / or the weight of the counterweight (1211) are used to adjust the output characteristics of the vibration sound generation.

2. The speaker module according to claim 1, characterized in that: The cantilever (122) is wavy in shape.

3. The speaker module according to claim 1, characterized in that: The central elastic piece (13) comprises a first end (131) and a second end (132); The first end (131) is connected to the transmission member (1311); The second end (132) is connected to the connecting portion (121).

4. The speaker module according to claim 3, characterized in that: The transmission member (1311) is columnar and fixedly penetrates the first end (131); The first end (131) of the central elastic sheet (13) extends from the connecting portion (121) toward the center of the diaphragm assembly (2), and the transmission member (1311) is connected to the center of the diaphragm assembly (2).

5. The speaker module according to claim 1, characterized in that: The diaphragm assembly (2) comprises: A diaphragm (21) comprises a central portion (211) and a folding ring (212) arranged around the central portion (211), and a transmission member (1311) is connected to the central portion (211); and The spherical top (22) is connected to the central portion (211).

6. The speaker module according to claim 5, characterized in that: The cross section of the folding ring (212) is arc-shaped or S-shaped.

7. The speaker module according to claim 1, characterized in that: The driving assembly (3) comprises: A piezoelectric ceramic sheet (31) connected to the central elastic sheet (13); and A circuit board (32) is connected to the piezoelectric ceramic sheet (31), and the circuit board (32) is configured to receive an alternating current signal to drive the piezoelectric ceramic sheet (31) to deform and thereby drive the diaphragm assembly (2) to vibrate.

8. The speaker module according to claim 1, characterized in that: At least one leakage hole (41) is also provided on the basin frame (4), and the leakage hole (41) is also covered with a gauze (411).

9. The speaker module according to any one of claims 1 to 3, characterized in that: Two of the spring sheets (1) and two of the drive components (3) are provided, and each set of the spring sheets (1) and the drive components (3) is connected to the diaphragm component (2) via one of the transmission components (1311).

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