Loudspeaker system and electronic equipment

Abstract

The invention provides a loudspeaker system and electronic equipment, and the loudspeaker system comprises a first housing which is internally provided with a first accommodation cavity; the first active vibrating diaphragm is arranged in the first accommodating cavity; the second shell is internally provided with a second accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity to form a closed cavity; the first passive vibrating diaphragm is arranged on one side of the second shell and is driven by the first active vibrating diaphragm to vibrate; the at least one second passive vibrating diaphragm is arranged on one side, opposite to the first passive vibrating diaphragm, of the second shell, and the oscillation starting directions of the second passive vibrating diaphragm and the first passive vibrating diaphragm are opposite; and / or, the second passive vibrating diaphragm and the first passive vibrating diaphragm are arranged on the same side of the second shell, and the oscillation starting directions of the second passive vibrating diaphragm and the first passive vibrating diaphragm are the same. The displacement distance of the first passive diaphragm can be reduced, the low-frequency vibration sense of the loudspeaker system is weakened, and the low-frequency performance of the loudspeaker system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a loudspeaker system and electronic equipment. Background Art

[0002] With the rapid development of communication technology, electronic products are updated and replaced more and more quickly. The time and frequency of users' use of electronic products have increased significantly, and higher requirements have been placed on the music functions that can be realized in electronic products. Speakers as bass units have also been widely used in current smart electronic products. There are many parameters for evaluating the sound quality of speakers, such as resonant frequency and low-frequency sensitivity. Speakers mainly rely on the vibration of the diaphragm to drive the air vibration to produce sound. When the stiffness of the diaphragm is large, the system stiffness of the speaker will increase, resulting in a higher resonant frequency of the speaker and poor low-frequency sensitivity.

[0003] Under the same sound pressure level requirement, the vibration displacement generated by the low frequency of conventional speakers is larger than that of the mid- and high-frequency. The larger displacement will bring about the problem of strong low-frequency vibration, and the low-frequency performance of conventional passive radiation speakers is limited by the speaker's own stiffness and mass. A diaphragm with too much mass will increase the vibration displacement it generates, aggravate the low-frequency vibration of the speaker, and reduce the user experience. The diaphragm with lower stiffness is difficult to process, has a low yield rate, and is not easy to implement in engineering applications.

[0004] Therefore, it is necessary to provide a new speaker system to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a loudspeaker system and electronic equipment which can provide negative stiffness for a diaphragm, and can improve the low-frequency performance of the loudspeaker while weakening the low-frequency vibration of the loudspeaker.

[0006] In order to solve the above technical problems, the present invention provides a speaker system, comprising: A first shell, wherein a first accommodating cavity is disposed in the first shell; A first active diaphragm, wherein the first active diaphragm is disposed in the first accommodating cavity; A second housing, wherein a second accommodating cavity is disposed in the second housing, and the second accommodating cavity is communicated with the first accommodating cavity to form a closed cavity; a first passive diaphragm, the first passive diaphragm being disposed at one side of the second shell and being driven by the first active diaphragm to vibrate; At least one second passive diaphragm, wherein the second passive diaphragm is arranged on a side of the second shell facing away from the first passive diaphragm, and the vibration directions of the second passive diaphragm and the first passive diaphragm are opposite; and / or the second passive diaphragm and the first passive diaphragm are arranged on the same side of the second shell, and the vibration directions of the second passive diaphragm and the first passive diaphragm are the same.

[0007] Preferably, it also includes a third shell connected to the second shell, a third accommodating cavity is arranged in the third shell, the second passive diaphragm is arranged between the second shell and the third shell to separate the second accommodating cavity from the third accommodating cavity, a central magnetic block is arranged on the second passive diaphragm, and magnetic components that interact with the central magnetic block are arranged in the second accommodating cavity and the third accommodating cavity.

[0008] Preferably, the magnetic assembly comprises a first magnetic member arranged on the inner side wall of the third accommodating cavity and a second magnetic member arranged on the inner side wall of the second accommodating cavity, and the central magnetic block is fixedly arranged on a side of the second passive diaphragm close to the third accommodating cavity; The first magnetic member, the second magnetic member and the central magnetic block have the same magnetizing direction, so that the cooperative force of the first magnetic member and the second magnetic member on the central magnetic block is zero when the second passive diaphragm is in a non-vibrating state.

[0009] Preferably, the second accommodating chamber is connected to the first accommodating chamber via at least one extending pipe to form the closed cavity.

[0010] Preferably, the first active diaphragm is disposed in the first accommodating cavity to divide the first accommodating cavity into a first front cavity and a first rear cavity, and the first rear cavity is connected to the second accommodating cavity to form a closed cavity.

[0011] Preferably, the first shell is provided with a first output port for connecting the first front cavity with the outside, and the speaker system radiates sound to the outside of the first shell through the first output port.

[0012] Preferably, the first rear cavity and the second accommodating cavity are connected via at least one extending pipe to form the closed cavity.

[0013] Preferably, the first passive diaphragm and the first active diaphragm have the same vibration direction.

[0014] Preferably, a second active diaphragm is further provided on the first shell, and the second active diaphragm is provided on a side of the first shell facing away from the first active diaphragm, and the vibration direction of the second active diaphragm is opposite to that of the first active diaphragm.

[0015] Preferably, the number of the second passive diaphragms is configured to be at least two, one of the second passive diaphragms is arranged on a side of the second shell facing away from the first passive diaphragm, and the second passive diaphragm and the first passive diaphragm have opposite vibration directions; Another second passive diaphragm is arranged on the side of the first shell facing away from the second active diaphragm, and has the same vibration direction as the first passive diaphragm; and / or, another second passive diaphragm is arranged on the same side of the second shell as the first passive diaphragm, and has the same vibration direction as the first passive diaphragm.

[0016] Preferably, when the other second passive diaphragm is arranged on the side of the first shell facing away from the second active diaphragm, a gap is provided between the second passive diaphragm and the first active diaphragm for the first active diaphragm to vibrate.

[0017] Based on the above speaker system, the present invention further provides an electronic device, which includes any of the above speaker systems.

[0018] The beneficial effect of the present invention is that the present invention connects the first accommodating cavity with the second accommodating cavity to form a closed cavity. When the first active diaphragm is driven by electricity to vibrate in the first direction relative to the first shell, it will affect the internal air pressure between the first accommodating cavity, the extension pipe and the second accommodating cavity, and the fluctuation of the internal air pressure will cause the first passive diaphragm to vibrate in the first direction relative to the second shell. By setting the central magnetic block and the magnetic component, the restoring force of the second passive diaphragm when vibrating in the first direction is reduced, so that the second passive diaphragm exhibits the characteristics of a negative stiffness diaphragm, and the force generated by the vibration of each diaphragm in the speaker system is balanced. Without increasing the mass of the passive diaphragm and without requiring the stiffness of the passive diaphragm itself, the vibration of the speaker system is greatly reduced, and while weakening the low-frequency vibration of the speaker, its low-frequency performance can be improved, effectively broadening the low-vibration bandwidth of the speaker system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a speaker system provided in an embodiment of the present invention.

[0021] Figure 2 It is a first structural schematic diagram of a speaker system provided in conventional technology.

[0022] Figure 3for Figure 2 Equivalent circuit diagram of the loudspeaker system shown.

[0023] Figure 4 This is a diagram of a first embodiment of a speaker system provided in an embodiment of the present invention.

[0024] Figure 5 This is a diagram of a second embodiment of a speaker system provided by an embodiment of the present invention.

[0025] Figure 6 for Figure 1 Equivalent circuit diagram of the loudspeaker system shown.

[0026] Figure 7 It is a second structural schematic diagram of a speaker system provided in conventional technology.

[0027] Figure 8 A diagram showing a third embodiment of a speaker system provided in an embodiment of the present invention.

[0028] Fig. 9 A diagram showing a fourth embodiment of a speaker system provided in an embodiment of the present invention.

[0029] Fig.10 This is a schematic structural diagram of a third shell in the speaker system provided in an embodiment of the present invention.

[0030] Fig.11 for Figure 8 or Fig. 9 Equivalent circuit diagram of the loudspeaker system shown.

[0031] Fig.12 for Figure 8 and Fig. 9 The speaker system shown is Figure 7 Comparison of sound pressure level curves for the loudspeaker systems shown.

[0032] Fig.13 for Figure 8 and Fig. 9 The speaker system shown is Figure 7 Comparison of curves showing the resultant forces acting on the loudspeaker system shown.

[0033] Fig.14 for Fig.10 The speaker system shown is Figure 7 Comparison of sound pressure level curves for the loudspeaker systems shown.

[0034] Fig.15 for Fig.10 The speaker system shown is Figure 7 A comparison diagram of the force changes of the first active diaphragm and the first passive diaphragm in the speaker system shown in FIG.

[0035] Description of reference numerals: 10-first shell; 11-first accommodating chamber; 111-first front chamber; 112-first rear chamber; 12-first active diaphragm; 13-second active diaphragm; 14-first output port; 20-second shell; 21-second accommodating chamber; 22-first passive diaphragm; 30-second passive diaphragm; 31-center magnetic block; 32-magnetic assembly; 321-first magnetic member; 322-second magnetic member; 33-third shell; 34-third accommodating chamber; 35-folding ring; 40-extension pipe. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] Please refer to Figure 1-Figure 15 The embodiments of the present invention provide a speaker system and an electronic device, which can reduce the equivalent stiffness of the passive diaphragm, weaken the low-frequency vibration of the speaker system, and improve the low-frequency performance of the speaker system. Figure 1 , is a schematic diagram of the structure of a speaker system provided in an embodiment of the present invention. The speaker system provided in the present invention includes a first shell 10, a second shell 20 and at least one second passive diaphragm 30.

[0038] As an optional embodiment, the present invention is provided with a first active diaphragm 12 on the first shell 10, and the first active diaphragm 12 can vibrate in a first direction relative to the first shell 10, and a first accommodating cavity 11 is provided inside the first shell 10, and a first passive diaphragm 22 is provided on the second shell 20, and the first passive diaphragm 22 can vibrate in the first direction relative to the second shell 20. The present invention connects the first accommodating cavity 11 with the second accommodating cavity 21 to form a closed cavity, so that when the first active diaphragm 12 is driven by electricity to vibrate, it affects the air pressure between the first accommodating cavity 11 and the second accommodating cavity 21, thereby driving the first passive diaphragm 22 to vibrate along the first direction.

[0039] Understandably, please refer to Figure 2 , which is a first structural diagram of a speaker system provided in conventional technology, the first active diaphragm 12 can be directly arranged in the first accommodating cavity 11, such as Figure 7 , which is a second structural schematic diagram of a speaker system provided in conventional technology, the first active diaphragm 12 may also be disposed on the first shell 10 , such as directly disposing the first active diaphragm 12 on the side wall of the first shell 10 .

[0040] Similarly, the first passive diaphragm 22 can be set on the outer wall of the second shell 20, or the first passive diaphragm 22 can be set in the second accommodating cavity 21. The above settings of the first passive diaphragm 22 are all feasible. The present invention does not further limit the specific setting positions of the above-mentioned first active diaphragm 12 and the first passive diaphragm 22.

[0041] Furthermore, the first passive diaphragm 22 and the first active diaphragm 12 have the same vibration direction, and the number of the second passive diaphragm 30 is configured to be at least one.

[0042] Please refer to Figure 4 , is a first embodiment diagram of a speaker system provided by an embodiment of the present invention. In this application embodiment, the present invention arranges the first passive diaphragm 22 on the side wall of the second housing 20, and arranges the second passive diaphragm 30 on the side of the second housing 20 facing away from the first passive diaphragm 22. At this time, the second passive diaphragm 30 and the first passive diaphragm 22 are both arranged on the outer side wall of the second housing 20, and the vibration directions of the second passive diaphragm 30 and the first passive diaphragm 22 are opposite, corresponding to Figure 4 It can be reflected that the directions of the folding ring parts 35 of the first passive diaphragm 22 and the second passive diaphragm 30 are opposite.

[0043] The second passive diaphragm 30 and the first passive diaphragm 22 may also be disposed on the side wall of the second housing 20 on the same side. Figure 5 , which is a second embodiment of the speaker system provided by an embodiment of the present invention, the first passive diaphragm 22 and the second passive diaphragm 30 are both arranged on the same side wall of the second housing 20, and the vibration direction of the second passive diaphragm 30 is the same as that of the first passive diaphragm 22, corresponding to Figure 5 It can be reflected that the directions of the folding ring portion 35 of the first passive diaphragm 22 and the second passive diaphragm 30 are the same.

[0044] Of course, one of the second passive diaphragms 30 can also be arranged on the side of the second shell 20 facing away from the first passive diaphragm 22, limiting the second passive diaphragm 30 and the first passive diaphragm 22 to have opposite vibration directions. At the same time, another second passive diaphragm 30 is arranged, and the second passive diaphragm 30 and the first passive diaphragm are arranged on the side wall on the same side of the second shell 20, limiting the second passive diaphragm 30 and the passive diaphragm to have the same vibration direction, that is, Figure 4 and Figure 5 The combination of the first embodiment and the second embodiment shown can also avoid the problem of strong low-frequency vibration caused by large displacement of the loudspeaker under the same sound pressure level requirement.

[0045] It can be understood that it is feasible to arrange the second passive diaphragm 30 on the side of the second shell 20 facing away from the first passive diaphragm 22, or to arrange the second passive diaphragm 30 and the first passive diaphragm 22 on the same side of the second shell 20, or to arrange the second passive diaphragm 30 on both the side of the second shell 20 facing away from the first passive diaphragm 22 and on the same side of the second shell 20 where the first passive diaphragm 22 is arranged. In principle, the vibration direction of the second passive diaphragm 30 can be adjusted accordingly according to different setting positions, and technical personnel in this field should know this.

[0046] As an optional implementation, in order to make the second passive diaphragm 30 exhibit the characteristics of a negative stiffness diaphragm, please refer to Fig.10 , is a structural schematic diagram of the third shell 33 in the speaker system provided in an embodiment of the present invention. The present application also provides a third shell 33 connected to the second shell 20, and a third accommodating cavity 34 is provided in the third shell 33. By arranging the second passive diaphragm 30 between the second shell 20 and the third shell 33, the second accommodating cavity 21 and the third accommodating cavity 34 are separated.

[0047] Furthermore, the present application provides a central magnetic block 31 on the second passive diaphragm 30, and provides a magnetic component 32 that interacts with the central magnetic block 31 in the second accommodating cavity 21 and the third accommodating cavity 34. Preferably, the central magnetic block 31 is fixedly arranged on the side of the second passive diaphragm 30 close to the third accommodating cavity 34.

[0048] Specifically, the above-mentioned magnetic component 32 includes a first magnetic component 321 arranged on the inner wall of the third accommodating cavity 34 and a second magnetic component 322 arranged on the inner wall of the second accommodating cavity 21. Preferably, the first magnetic component 321 is arranged on the inner wall on the side away from the central magnetic block 31 in the third accommodating cavity 34, and the second magnetic component 322 is arranged on the inner wall on the side away from the central magnetic block 31 in the second accommodating cavity 21. By controlling the magnetization direction of the magnetic component 32 and the central magnetic block 31, the vibration of the second passive diaphragm 30 along the first direction between the second accommodating cavity 21 and the third accommodating cavity 34 is correspondingly controlled.

[0049] In an optional embodiment, the present application sets the first magnetic member 321 and the second magnetic member 322 to have the same magnetization direction as the central magnetic block 31, so that the cooperative force of the first magnetic member 321 and the second magnetic member 322 on the central magnetic block 31 is zero when the second passive diaphragm 30 is in a non-vibrating state.

[0050] In the embodiment of the present application, when the second passive diaphragm 30 is in a stationary state, the cooperative force of the first magnetic member 321 and the second magnetic member 322 on the opposite sides of the second passive diaphragm 30 is zero. Since the magnetization direction of the central magnetic block 31 is the same as that of the first magnetic member 321 and the second magnetic member 322, it can also be understood that when the second passive diaphragm 30 is in a stationary state, the cooperative force of the magnetic attraction force of the first magnetic member 321 and the second magnetic member 322 on the opposite sides of the central magnetic block 31 provided on the second passive diaphragm 30 is zero.

[0051] Since the first accommodating cavity 11 and the second accommodating cavity 21 are interconnected to form a closed cavity, when the first active diaphragm 12 is driven by electricity to vibrate along the first direction in the first accommodating cavity 11, it will affect the internal air pressure of the second accommodating cavity 21. When the second passive diaphragm 30 and the first passive diaphragm 22 are arranged on the same side of the second shell 20, the fluctuation of the internal air pressure will cause the equilibrium state of the first passive diaphragm 22 and the second passive diaphragm 30 to be broken.

[0052] Furthermore, the first passive diaphragm 22 and the second passive diaphragm 30 will vibrate along the first direction in the second accommodating cavity 21 under the influence of the internal air pressure fluctuation. When the second passive diaphragm 30 vibrates along the first direction, the cooperative force of the first magnetic member 321 and the second magnetic member 322 changes, and the first magnetic member 321 and the second magnetic member 322 have the same magnetizing direction as the central magnetic block 31. Therefore, the central magnetic block 31 is attracted by the first magnetic member 321 and the second magnetic member 322, which will reduce the restoring force of the second passive diaphragm 30 when it vibrates in the first direction.

[0053] In the embodiment of the present application, since the magnetization direction of the magnetic component 32 is the same as that of the central magnetic block 31, a magnetic attraction force will be generated between the central magnetic block 31 and the first magnetic member 321 arranged in the third accommodating cavity 34, and the second magnetic member 322 arranged in the second accommodating cavity 21. The magnetic attraction force will reduce the restoring force of the second passive diaphragm 30 when it vibrates in the first direction, so that the second passive diaphragm 30 exhibits the characteristics of a negative stiffness diaphragm. The present application provides negative stiffness for the speaker system through the second passive diaphragm 30. Without increasing the mass of the first passive diaphragm 22 and without requiring the stiffness of the first passive diaphragm 22 itself, low-frequency sound absorption is achieved with an extremely small depth of the second accommodating cavity 21, thereby weakening the low-frequency vibration of the speaker system and reducing the size requirement of the speaker system.

[0054] It can be understood that negative stiffness refers to the phenomenon that when an object is subjected to an external force, its deformation decreases as the external force increases. Under normal circumstances, the deformation of an object will increase as the external force increases, while negative stiffness is the opposite phenomenon, that is, as the external force increases, the deformation of the object will decrease. In the embodiment of the present application, the magnetic component 32 is set to have the same magnetization direction as the central magnetic block 31. The magnetic attraction force generated by the magnetic component 32 on the central magnetic block 31 will reduce the restoring force of the second passive diaphragm 30 when it vibrates in the first direction, so that the second passive diaphragm 30 exhibits the characteristics of a negative stiffness diaphragm, thereby providing negative stiffness for the speaker system.

[0055] As an optional embodiment, the above-mentioned first magnetic member 321, central magnetic block 31 and second magnetic member 322 are preferably arranged along the first direction, and the first magnetic member 321 and the second magnetic member 322 each include at least one magnetic block; when the first magnetic member 321 and the second magnetic member 322 are each provided with only one magnetic block, it should be ensured that the first magnetic member 321 and the second magnetic member 322 respectively overlap at least partially with the projection of the central magnetic block 31 in the first direction, so as to ensure the magnetic attraction effect formed between the first magnetic member 321 and the second magnetic member 322 and the central magnetic block 31.

[0056] Of course, the number of magnetic blocks specifically arranged in the first magnetic member 321 and the second magnetic member 322 can also be adjusted accordingly according to actual needs. In principle, as long as the second passive diaphragm 30 does not need to vibrate, and the cooperative force of the magnetic attraction forces of the first magnetic member 321 and the second magnetic member 322 on both sides of the center magnetic block 31 is zero, other arrangements are also feasible, and the present application does not impose any further restrictions on this.

[0057] For further information, please refer to Figure 4 and Figure 5 , the first accommodating chamber 11 and the second accommodating chamber 21 can be connected by at least one extension pipe 40. At this time, a closed cavity will be formed between the first accommodating chamber 11, the extension pipe 40 and the second accommodating chamber 21. When the first active diaphragm 12 is driven by electricity to vibrate in the first direction relative to the first shell 10, it will affect the internal air pressure between the first accommodating chamber 11, the extension pipe 40 and the second accommodating chamber 21. The fluctuation of the internal air pressure will cause the first passive diaphragm 22 to vibrate in the first direction relative to the second shell 20. The present application balances the force generated by the vibration of each diaphragm in the speaker system by reducing the restoring force of the second passive diaphragm 30 when it vibrates in the first direction, thereby greatly reducing the vibration of the speaker system.

[0058] In an optional embodiment, please continue to refer to Figure 4When the first active diaphragm 12 is disposed in the first accommodating cavity 11, the first active diaphragm 12 will divide the first accommodating cavity 11 into a first front cavity 111 and a first rear cavity 112. At this time, the first rear cavity 112 and the second accommodating cavity 21 are connected to form the required closed cavity.

[0059] Similarly, at least one extension pipe 40 may be provided between the first rear cavity 112 and the second accommodating cavity 21, and the first rear cavity 112 and the second accommodating cavity 21 may be connected through the at least one extension pipe 40 to form a required closed cavity. When the first active diaphragm 12 is driven by electricity to vibrate along the first direction in the first accommodating cavity 11, it will affect the internal air pressure between the first rear cavity 112, the extension pipe 40 and the second accommodating cavity 21, thereby causing the first passive diaphragm 22 and the second passive diaphragm 30 to vibrate along the first direction relative to the second shell 20. The present invention will not elaborate on the specific process of how to drive the first passive diaphragm 22 and the second passive diaphragm 30 to vibrate.

[0060] As a further improvement of the present invention, please continue to refer to Figure 4 and Figure 5 When the first active diaphragm 12 is arranged in the first accommodating cavity 11, the first shell 10 is also provided with a first output port 14 for connecting the first front cavity 111 with the outside, so that the speaker system radiates the generated low-frequency sound to the outside of the first shell 10 through the first output port 14, so that the speaker system radiates the required audio frequency outward, thereby realizing the multi-stage resonance requirement of the speaker system.

[0061] In an alternative embodiment, please refer to Figure 7 A second active diaphragm 13 may also be provided on the first shell 10. In this case, the first active diaphragm 12 and the second active diaphragm 13 are both provided on the side wall of the first shell 10, and the second active diaphragm 13 is provided on the side of the first shell 10 which is away from the first active diaphragm 12. The vibration directions of the first active diaphragm 12 and the second active diaphragm 13 are opposite, that is, the folding ring portions 35 of the first active diaphragm 12 and the second active diaphragm 13 are provided in opposite directions.

[0062] Based on the above-mentioned arrangement of the first active diaphragm 12 and the second active diaphragm 13, the number of the second passive diaphragms 30 needs to be adjusted to at least two. Figure 8, which is a third embodiment diagram of the speaker system provided by an embodiment of the present invention, one of the second passive diaphragms 30 can be arranged on the side of the second shell 20 facing away from the first passive diaphragm 22, and the vibration direction of the second passive diaphragm 30 is limited to be the same as the vibration direction of the first passive diaphragm 22; the other second passive diaphragm 30 can be arranged on the side of the first shell 10 facing away from the second active diaphragm 13, and the vibration direction of the other second passive diaphragm 30 is limited to be the same as the vibration direction of the first passive diaphragm 22.

[0063] In the embodiment of the present application, the second passive diaphragm 30 is arranged on the side of the second shell 20 facing away from the first passive diaphragm 22, and the vibration direction of the second passive diaphragm 30 is opposite to that of the first passive diaphragm 22. By reducing the restoring force of the second passive diaphragm 30 when vibrating in the first direction, the force generated by the vibration of the second passive diaphragm 30 in the speaker system is balanced, thereby greatly reducing the vibration of the speaker system and weakening the low-frequency vibration.

[0064] Please refer to Fig. 9 , which is a fourth embodiment diagram of the speaker system provided by an embodiment of the present invention, one of the second passive diaphragms 30 can also be arranged on the side of the second shell 20 facing away from the first passive diaphragm 22, and the vibration direction of the second passive diaphragm 30 is limited to be the same as the vibration direction of the first passive diaphragm 22; another second passive diaphragm 30 and the first passive diaphragm 22 are arranged on the same side of the second shell 20, and the vibration direction of the second passive diaphragm 30 is limited to be the same as the vibration direction of the first passive diaphragm 22.

[0065] Of course, a corresponding second passive diaphragm 30 may be provided on the side of the second shell 20 facing away from the first passive diaphragm 22, on the side of the second shell 20 provided with the first passive diaphragm 22, and on the side of the first shell 10 facing away from the second active diaphragm 13. The specific vibration direction of the second passive diaphragm 30 may be limited according to actual application requirements and application scenarios to achieve a significant improvement in the low-frequency SPL (Sound Pressure Level) of the speaker system and a weakening of the low-frequency vibration.

[0066] Please refer to Figure 8 When another second passive diaphragm 30 is arranged on the side of the first shell 10 facing away from the second active diaphragm 13, a gap should be provided between the second passive diaphragm 30 and the first active diaphragm 12 for the first active diaphragm 12 to vibrate in the first direction, so as to avoid the first active diaphragm 12 and the second passive diaphragm 30 being too close to affect the normal vibration of the first active diaphragm 12 in the first direction.

[0067] It can be understood that although the above embodiment only shows the arrangement of a first shell 10 and a second shell 20, arranging several first shells 10 and several second shells 20 connected to the first shell 10 to achieve the required low-frequency vibration is a simple principle extension in this field. Under the premise of cost permission and the volume of the speaker system, the number and specific arrangement positions of the above-mentioned first shell 10, second shell 20, first active diaphragm 12, second active diaphragm 13, first passive diaphragm 22, and second passive diaphragm 30 can be adaptively adjusted to make the speaker system provided by the present invention easier to be adjusted to the required frequency, and the present invention does not impose further restrictions on this.

[0068] The present invention reduces the restoring force of the second passive diaphragm 30 when vibrating in the first direction by setting the magnetic component 32 and the central magnetic block 31, thereby adjusting the resultant force of the speaker system accordingly, so that the resultant force of the speaker system maintains a lower vibration in both the low frequency band and the mid-high frequency band.

[0069] As an optional implementation, please refer to Figure 3 ,for Figure 2 The equivalent circuit diagram of the loudspeaker system shown, and Figure 6 ,for Figure 1 From the equivalent circuit diagram of the speaker system shown in the figure, it can be observed that the speaker system provided by the present invention enables the second passive diaphragm 30 to exhibit the characteristics of a negative stiffness diaphragm. Under the same frequency design requirements as the speaker system in conventional technology, the mass of the first passive diaphragm 22 can be effectively reduced, thereby weakening the low-frequency vibration.

[0070] Please refer to Fig.11 ,for Figure 8 or Fig. 9 From the equivalent circuit diagram of the speaker system shown in FIG. 1 , it can be observed that the speaker system provided by the present invention is equivalent to the structure of a conventional speaker system with an equivalent negative stiffness voltage source KX added. Therefore, the negative stiffness of the second passive diaphragm 30 can be adjusted by the equivalent negative stiffness voltage source KX, so that the speaker system can radiate the required sound frequency outward, thereby realizing the multi-stage resonance requirement of the speaker system.

[0071] Understandably, Figure 3 , Figure 6 and Fig.11 Re is the voice coil DC resistance, Le is the voice coil inductance, Ma is the equivalent acoustic mass of the tube cavity structure, Ca is the equivalent acoustic capacitance of the tube cavity structure, and Ra is the equivalent acoustic impedance of the tube cavity structure; Figure 3 and Figure 6 The tubular cavity structure in the embodiment is a tubular cavity structure formed by the first rear cavity 112, the extension pipe 40 and the second accommodating cavity 21. Fig.11The tubular cavity structure in is a tubular cavity structure formed by the first accommodating cavity 11, the extension pipe 40 and the second accommodating cavity, which should be known to those skilled in the art.

[0072] For details, please continue to refer to Figure 6 , Fig.10 as well as Fig.11 , the force on the first active diaphragm 12 is , the force on the first passive diaphragm 22 is , the force on the second passive diaphragm 30 is , the above , and The calculation formula is as follows: in, is the vibration speed of the first active diaphragm 12 .

[0073] Furthermore, the calculation formula of the equivalent acoustic end impedance Za of the speaker system is as follows: ; ; It can be seen from this that, under the premise of knowing the parameters of the first active diaphragm 12 and the first passive diaphragm 22, by adjusting the parameters and force excitation direction of the added second passive diaphragm 30 within a reasonable range, the overall force of the speaker system can be adjusted, thereby weakening the low-frequency vibration of the speaker system as needed.

[0074] Specifically, Mms is the equivalent vibration mass of the diaphragm, Cms is the equivalent compliance of the diaphragm, Rms is the resistance encountered by the diaphragm during the vibration process, and Sd is the effective area of ​​the diaphragm; taking the parameter equivalent vibration mass Mms as an example, Mms1 corresponds to the equivalent vibration mass of the first active diaphragm 12, Mms2 corresponds to the equivalent vibration mass of the first passive diaphragm 22, and Mms3 corresponds to the equivalent vibration mass of the second passive diaphragm 30. This application does not go into details about other parameters of each diaphragm.

[0075] Please attach Fig.11 The parameters Mms, Cms and Rms of the second passive diaphragm 30 correspond to the following Fig.11 Mms3, Cms3 and Rms3, wherein Mms3 is the equivalent vibration mass of the second passive diaphragm 30, Cms3 is the equivalent compliance of the second passive diaphragm 30, Rms3 is the resistance encountered by the second passive diaphragm 30 during vibration, and Sd3 is the effective area of ​​the second passive diaphragm 30. By adjusting the above parameters, the equivalent sound end impedance Za of the speaker system can be adjusted accordingly.

[0076] In the embodiment of the present application, when the second passive diaphragm 30 is in the initial equilibrium position, the magnetic suction forces of the first magnetic member 321 and the second magnetic member 322 on the second passive diaphragm 30 are equal up and down, and the total magnetic suction force F is 0. When the first active diaphragm 12 is vibrated by electric drive, the internal pressures of the first housing 10 and the second housing 20 change, resulting in the balance state of the second passive diaphragm 30 being broken and thus generating vibration.

[0077] Specifically, when the second passive diaphragm 30 vibrates upward, the upward magnetic suction force of the second passive diaphragm 30 on the first magnetic member 321 increases, and the downward magnetic suction force on the second magnetic member 322 decreases. Therefore, the total magnetic suction force F is upward, and this total magnetic suction force F is opposite to the restoring force (Kms3 * -dis) of the second passive diaphragm 30 itself; when the second passive diaphragm 30 vibrates downward, the downward magnetic suction force of the second passive diaphragm 30 on the second magnetic member 322 increases, and the upward magnetic suction force on the first magnetic member 321 decreases. Therefore, the total magnetic suction force F is downward, and this total magnetic suction force F is also opposite to the restoring force (Kms3 * -dis) of the second passive diaphragm 30 itself. Therefore, the equivalent mechanical stiffness presented by the second passive diaphragm 30 is K = (Kms3 * -dis + F) / -dis.

[0078] Without adding the central magnetic block 31 and the magnetic component 32, the equivalent mechanical stiffness presented by the second passive diaphragm 30 is Kori = (Kms3 * -dis) / -dis. Obviously, K < Kori. Therefore, the second passive diaphragm 30 after adding the central magnetic block 31 and the magnetic component 32 can present the characteristic of negative stiffness, where Kms3 = 1 / Cms3, and dis is the displacement of the second passive diaphragm 30 in the first direction. It can be understood that the total magnetic suction force F generated by the central magnetic block 31 and the magnetic component 32 under the displacement change of the second passive diaphragm 30 can be characterized by multiplying the stiffness Kx under a set of displacement changes by the displacement dis. At the same time, the total magnetic suction force F is always opposite to the restoring force (Kms3 * -dis) of the second passive diaphragm 30 itself at the non-equilibrium position. Therefore, this negative stiffness unit can be equivalent to a negative stiffness element in the circuit diagram, and through optimized design, it can present a linear relationship. Specifically, the negative stiffness element is characterized by attaching Fig.11 the voltage source Kx in the figure.

[0079] Please continue to refer to Figure 2 and Figure 3By observing the speaker system provided in the conventional technology and its corresponding equivalent circuit diagram, it can be observed that in the conventional speaker system, due to the difference in resonant frequency between the first active diaphragm 12 and the first passive diaphragm 22, the displacements generated by the two in the low frequency band are opposite, and the displacements generated in the mid-to-high frequency band are in the same direction. The resultant force generated by the entire speaker system will form a maximum value at the mid-to-high frequency position, and the vibration is the strongest at this time; if the first passive diaphragm 22 is installed on the lower wall of the second shell 20, since the displacement generated by the first passive diaphragm 22 in the low frequency band is large and the displacement generated in the mid-to-high frequency band is small, the speaker system will form a strong vibration at low frequencies. Therefore, the speaker system provided in the conventional technology will not be able to maintain a low vibration in the use frequency band, such as the low frequency band and the mid-to-high frequency band.

[0080] In the embodiment of the present application, by setting a second passive diaphragm 30 on the same side and in the same vibration direction as the first passive diaphragm 22, and / or setting a second passive diaphragm 30 on the opposite side and in the opposite vibration direction of the first passive diaphragm 22, the combined force of the speaker system can be adjusted to maintain a relatively low vibration in both the low frequency band and the mid-to-high frequency bands; specifically, the force F3 generated by the second passive diaphragm 30 can be adjusted by adjusting the equivalent parameters Mms, Cms, Rms, and Sd of the second passive diaphragm 30, and then the overall force of the speaker system can be adjusted through F3 to weaken the low-frequency vibration of the speaker system. The present application does not elaborate on the specific steps and principles of how to adjust.

[0081] Please refer to Fig.12 ,for Figure 8 and Fig. 9 The speaker system shown is Figure 7 The sound pressure level curve comparison chart of the speaker system shown, Fig.12 The horizontal axis is the frequency in Hz, and the vertical axis is the sound pressure value in dB; Fig.12 The curves of S111 and S112 are Figure 8 The frequency response curve of the loudspeaker system shown in the figure is Fig.12 The curve of S113 is Fig. 9 By comparing the frequency response curves of the speaker system shown in FIG. 1 , it can be clearly observed that when the speaker system provided by the present invention is set to Fig. 9 When the speaker system is shown, a lower resonant frequency is achieved and better low-frequency sensitivity is achieved.

[0082] Please refer to Fig.13 ,for Figure 8 and Fig. 9 The speaker system shown is Figure 7 The curve comparison diagram of the resultant force on the speaker system shown in the figure, Fig.13 The horizontal axis is the frequency in Hz, and the vertical axis is the resultant force on the speaker system in the first direction in N. Fig.13The curve of S121 is Figure 7 The resultant force on the loudspeaker system in the first direction is Fig.13 The curve of S122 is Figure 8 The resultant force on the loudspeaker system in the first direction is Fig.13 The curve of S123 is Fig. 9 By comparison, it can be observed that the resultant force exerted on the speaker system in the first direction can be reduced by providing the second passive diaphragm 30, and the restoring force of the second passive diaphragm 30 when vibrating in the first direction can be reduced, thereby effectively improving the low-frequency performance of the speaker system.

[0083] For further information, please refer to Fig.14 , for the speaker system shown in 10 and Figure 7 The sound pressure level curve comparison chart of the speaker system shown, Fig.14 The horizontal axis is the frequency in Hz, and the vertical axis is the sound pressure value in dB; Fig.14 The middle curve S131 is a frequency response curve of a speaker system provided in conventional technology. Fig.14 The middle curve S132 is provided by the present invention (such as Fig.10 By comparing the frequency response curve of the speaker system (shown in FIG. 1 ), it can be clearly observed that the speaker system provided by the present invention achieves a significant improvement in the low-frequency SPL and a weakening of the low-frequency vibration while maintaining the same low-frequency resonant frequency.

[0084] Please refer to Fig.15 ,for Fig.10 The speaker system shown is Figure 7 A comparison diagram of the force on the first active diaphragm 12 and the first passive diaphragm 22 in the loudspeaker system as a function of frequency is shown. Fig.15 The horizontal axis is the frequency, the unit is Hz, and the vertical axis is the force on the diaphragm, including the force on the first active diaphragm 12 and the force on the first passive diaphragm 22, the unit is N; Fig.15 The middle curves S141 and S142 are curves showing the force of the first active diaphragm 12 and the first passive diaphragm 22 changing with the frequency in the conventional technology. Fig.15 The middle curves S143 and S144 are provided by the present invention (such as Fig.10 By comparing the curves of force variation with frequency of the first active diaphragm 12 and the first passive diaphragm 22 in the speaker system (as shown in the figure), it can be obviously observed that the displacement of the first active diaphragm 12 and the first passive diaphragm 22 of the speaker system provided by the present invention is smaller at low frequencies, so the overall size requirement of the speaker system is smaller, which can effectively meet the design requirements of the micro speaker.

[0085] Based on the above-mentioned speaker system, the present invention also provides an electronic device, which can be set in an electronic device such as a mobile phone, a tablet computer, a speaker, etc. The above-mentioned speaker system is applied to the electronic device, and a controller for driving the first active diaphragm to vibrate can be set in the electronic device to indirectly drive the first passive diaphragm to vibrate. For other details about the above-mentioned electronic device to implement the above-mentioned technical solution, please refer to the description of the speaker system provided in the above-mentioned invention embodiment, which will not be repeated here.

[0086] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A speaker system, characterized in that: include: A first shell, wherein a first accommodating cavity is disposed in the first shell; A first active diaphragm, wherein the first active diaphragm is disposed in the first accommodating cavity; A second housing, wherein a second accommodating cavity is disposed in the second housing, and the second accommodating cavity is communicated with the first accommodating cavity to form a closed cavity; a first passive diaphragm, the first passive diaphragm being disposed at one side of the second shell and being driven by the first active diaphragm to vibrate; At least one second passive diaphragm, wherein the second passive diaphragm is arranged on a side of the second shell facing away from the first passive diaphragm, and the vibration directions of the second passive diaphragm and the first passive diaphragm are opposite; and / or the second passive diaphragm and the first passive diaphragm are arranged on the same side of the second shell, and the vibration directions of the second passive diaphragm and the first passive diaphragm are the same.

2. The speaker system according to claim 1, wherein: It also includes a third shell connected to the second shell, a third accommodating cavity is arranged in the third shell, the second passive diaphragm is arranged between the second shell and the third shell to separate the second accommodating cavity from the third accommodating cavity, a central magnetic block is arranged on the second passive diaphragm, and magnetic components that interact with the central magnetic block are arranged in the second accommodating cavity and the third accommodating cavity.

3. The speaker system according to claim 2, characterized in that: The magnetic assembly comprises a first magnetic member arranged on the inner side wall of the third accommodating cavity and a second magnetic member arranged on the inner side wall of the second accommodating cavity, and the central magnetic block is fixedly arranged on a side of the second passive diaphragm close to the third accommodating cavity; The first magnetic member, the second magnetic member and the central magnetic block have the same magnetizing direction, so that the cooperative force of the first magnetic member and the second magnetic member on the central magnetic block is zero when the second passive diaphragm is in a non-vibrating state.

4. The speaker system according to claim 1, wherein: The second accommodating chamber is connected to the first accommodating chamber through at least one extending pipe to form the closed cavity.

5. The speaker system according to claim 1, wherein: The first active diaphragm is disposed in the first accommodating cavity to divide the first accommodating cavity into a first front cavity and a first rear cavity, and the first rear cavity is communicated with the second accommodating cavity to form a closed cavity.

6. The speaker system according to claim 5, characterized in that: The first shell is provided with a first output port for connecting the first front cavity with the outside, and the speaker system radiates sound to the outside of the first shell through the first output port.

7. The speaker system according to claim 5, characterized in that: The first rear cavity and the second accommodating cavity are connected through at least one extending pipe to form the closed cavity.

8. The speaker system according to claim 1, wherein: The first passive diaphragm and the first active diaphragm have the same vibration direction.

9. The speaker system according to claim 1, wherein: A second active diaphragm is also disposed on the first shell. The second active diaphragm is disposed on a side of the first shell facing away from the first active diaphragm. The vibration directions of the second active diaphragm and the first active diaphragm are opposite.

10. The speaker system according to claim 9, characterized in that: The number of the second passive diaphragms is configured to be at least two, one of the second passive diaphragms is arranged on a side of the second housing facing away from the first passive diaphragm, and the vibration directions of the second passive diaphragm and the first passive diaphragm are opposite; Another second passive diaphragm is arranged on the side of the first shell facing away from the second active diaphragm, and has the same vibration direction as the first passive diaphragm; and / or, another second passive diaphragm is arranged on the same side of the second shell as the first passive diaphragm, and has the same vibration direction as the first passive diaphragm.

11. The speaker system according to claim 10, characterized in that: When the other second passive diaphragm is arranged on the side of the first shell facing away from the second active diaphragm, a gap is provided between the second passive diaphragm and the first active diaphragm for the first active diaphragm to vibrate.

12. An electronic device, characterized in that: The electronic device comprises the speaker system according to any one of claims 1-11.

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