Speaker systems and electronics

Abstract

The present invention provides a speaker system and electronic equipment, wherein the speaker system includes a first housing, in which a first accommodating cavity is arranged; at least one passive diaphragm is arranged in the first accommodating cavity, and the first accommodating cavity is divided into a first front cavity and a first rear cavity; a second housing, in which a second accommodating cavity is arranged, and an active diaphragm is arranged in the second accommodating cavity, and the active diaphragm divides the second accommodating cavity into a second front cavity and a second rear cavity, and the second rear cavity is connected with the first rear cavity to form a closed cavity; a central magnetic block is fixed to the side of the passive diaphragm facing away from the first front cavity; a magnetic component includes a first magnetic member arranged in the first front cavity and a second magnetic member arranged in the first rear cavity, and the first magnetic member and the second magnetic member have the same magnetization direction as the central magnetic block, and the cooperative force of the first magnetic member and the second magnetic member on the central magnetic block is zero when the passive diaphragm is in a non-vibrating state. The present invention can reduce the equivalent stiffness of the passive diaphragm, weaken the low-frequency vibration sense of the speaker system, and improve the low-frequency performance.

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] The low-frequency performance of conventional passive radiation speakers is mainly limited by the stiffness and mass of the speaker itself. A diaphragm with too much mass will intensify the vibration of the speaker and reduce the user experience, while a diaphragm with low 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 weaken the low-frequency vibration of the loudspeaker.

[0006] In order to solve the above technical problems, the present invention provides a speaker system, comprising:

[0007] A first shell, wherein a first accommodating cavity is disposed in the first shell;

[0008] at least one passive diaphragm, wherein the passive diaphragm is disposed in the first accommodating cavity, dividing the first accommodating cavity into a first front cavity and a first rear cavity;

[0009] a second housing, wherein a second accommodating cavity is disposed in the second housing, an active diaphragm is disposed in the second accommodating cavity, the active diaphragm divides the second accommodating cavity into a second front cavity and a second rear cavity, and the second rear cavity is connected with the first rear cavity to form a closed cavity;

[0010] A central magnetic block is fixed to a side of the passive diaphragm facing away from the first front cavity, and the central magnetic block moves along with the vibration of the passive diaphragm along the first direction in the first accommodating cavity;

[0011] A magnetic component, the magnetic component includes a first magnetic member arranged on the inner side wall of the first front cavity and a second magnetic member arranged on the inner side wall of the first rear cavity, the first magnetic member and the second magnetic member have the same magnetization direction as the central magnetic block, and the cooperative force exerted by the first magnetic member and the second magnetic member on the central magnetic block is zero when the passive diaphragm is in a non-vibrating state.

[0012] Preferably, the first magnetic member and the second magnetic member at least partially overlap with the projection of the central magnetic block in the first direction respectively.

[0013] 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.

[0014] Preferably, when the number of the passive diaphragms is configured to be several, the number of the central magnetic blocks is also several and they are arranged one-to-one corresponding to the passive diaphragms, and the several passive diaphragms are arranged in the first accommodating cavity along the first direction and are spaced apart from each other.

[0015] Preferably, the first rear cavity and the second rear cavity are connected via at least one extending pipe to form the closed cavity.

[0016] Preferably, the first rear cavity and the second rear cavity are directly connected to form a third rear cavity, the passive diaphragm is arranged between the first front cavity and the third rear cavity, and the active diaphragm is arranged between the second front cavity and the third rear cavity.

[0017] Preferably, the second shell is provided with a second output port for connecting the second front cavity with the outside, and the speaker system radiates sound to the outside of the second shell through the second output port.

[0018] Preferably, the speaker system also includes at least one intermediate cavity connected to the second front cavity, and the intermediate cavity is provided with a third output port for connecting the second front cavity with the outside, and the speaker system radiates sound to the outside of the second shell through the third output port.

[0019] Based on the above speaker system, the present invention further provides an electronic device, which includes any of the above speaker systems.

[0020] The beneficial effects of the present invention are as follows: a central magnetic block capable of accompanying the passive diaphragm to vibrate along a first direction is arranged on the passive diaphragm, and a magnetic component having the same magnetization direction as the central magnetic block is arranged inside the first shell. When the active diaphragm is driven to vibrate, the air pressure of the closed cavity formed by the second rear cavity and the first rear cavity is affected, so that the passive diaphragm is driven to vibrate along the first direction in the first accommodating cavity, resulting in a change in the cooperative force of the first magnetic component and the second magnetic component on the central magnetic block. When the passive diaphragm vibrates along the first direction, the attraction formed between the central magnetic block and the magnetic component will block the vibration of the passive diaphragm in the first accommodating cavity. The present invention reduces the equivalent stiffness of the passive diaphragm by introducing a magnetic component, and by setting the first magnetic component and the second magnetic component to have the same magnetization direction as the central magnetic block, low-frequency sound absorption is achieved with an extremely small first accommodating cavity depth without increasing the mass of the passive diaphragm and without requiring the stiffness of the passive diaphragm itself, thereby reducing the size requirement of the speaker, weakening the low-frequency vibration sense of the speaker system, and effectively improving the low-frequency performance of the speaker system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A schematic structural diagram of a passive radiator unit provided in an embodiment of the present invention.

[0023] Figure 2 A schematic structural diagram of another passive radiator unit provided in an embodiment of the present invention.

[0024] Figure 3 A schematic diagram of the structure of a speaker system provided in an embodiment of the present invention.

[0025] Figure 4 A schematic structural diagram of another speaker system provided by an embodiment of the present invention.

[0026] Figure 5 for Figure 1 Another structural schematic diagram of the passive radiator unit is shown.

[0027] Figure 6 It is a schematic diagram of the structure of a passive radiator unit provided in conventional technology.

[0028] Figure 7 for Figure 1 Equivalent circuit diagram of the passive radiator element shown.

[0029] Figure 8 for Figure 1 and Figure 6 Comparison of boost level curves for the passive radiator units shown.

[0030] Fig. 9 for Figure 1 and Figure 6 Comparison of displacement curves of passive radiator units shown.

[0031] Fig.10 for Figure 3 Equivalent circuit diagram of the loudspeaker system shown.

[0032] Fig.11 A speaker system provided in conventional technology and Figure 3 Comparison of boost level curves for the speaker systems shown.

[0033] Fig.12 A speaker system provided in conventional technology and Figure 3 A comparison of the force on the diaphragm versus frequency in the loudspeaker system shown.

[0034] Description of reference numerals:

[0035] 1-passive radiator unit; 2-driver unit; 10-first shell; 11-first accommodating chamber; 111-first front chamber; 112-first rear chamber; 12-first output port; 20-passive diaphragm; 201-vibration part; 202-folding ring part; 203-fixing part; 21-center magnetic block; 30-magnetic assembly; 31-first magnetic member; 32-second magnetic member; 33-magnetic block; 40-second shell; 41-second accommodating chamber; 411-second front chamber; 412-second rear chamber; 42-second output port; 43-extension pipe; 50-active diaphragm; 60-middle cavity; 61-third output port; 62-third rear chamber. 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 12 The embodiments of the present invention provide a speaker system and an electronic device, which can reduce the equivalent stiffness of a passive diaphragm, weaken the low-frequency vibration of the speaker system, and improve the low-frequency performance of the speaker system.

[0038] Please refer to Figure 1, is a structural schematic diagram of a passive radiator unit provided in an embodiment of the present invention. The speaker system provided in the present invention includes a first shell 10, at least one passive diaphragm 20, a central magnetic block 21, a magnetic component 30 and a second shell 40.

[0039] As an optional embodiment, the present invention provides a first accommodating cavity 11 in the first shell 10, and the passive diaphragm 20 is arranged in the first accommodating cavity 11 so that it can vibrate along a first direction in the first accommodating cavity 11. By setting the passive diaphragm 20 in the first accommodating cavity 11, the first accommodating cavity 11 of the first shell 10 is divided into two chambers, namely a first front cavity 111 and a first rear cavity 112.

[0040] For further information, please refer to Figure 3 , is a structural schematic diagram of a speaker system provided by an embodiment of the present invention. In the present invention, a second accommodating cavity 41 is correspondingly arranged in the second shell 40, and an active diaphragm 50 is arranged in the second accommodating cavity 41 so that it can vibrate along a first direction in the second accommodating cavity 41. The second accommodating cavity 41 is divided into two chambers by the active diaphragm 50, namely a second front cavity 411 and a second rear cavity 412. The second rear cavity 412 is connected to the first rear cavity 112 to form a closed cavity, and then the vibration of the active diaphragm 50 inside the second shell 40 is realized by electric drive.

[0041] As an optional embodiment, the present invention fixes the central magnetic block 21 to a side of the passive diaphragm 20 away from the first front cavity 111. Since the central magnetic block 21 is fixedly set on the passive diaphragm 20, when the passive diaphragm 20 vibrates along the first direction on the first accommodating cavity 11, the central magnetic block 21 set on the passive diaphragm 20 can also vibrate along the first direction inside the first accommodating cavity 11 along with the passive diaphragm 20, thereby moving along with the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11.

[0042] In an embodiment of the present invention, the magnetic component 30 includes a first magnetic component 31 and a second magnetic component 32. The present invention arranges the first magnetic component 31 and the second magnetic component 32 in the first front cavity 111 and the first rear cavity 112, respectively, and arranges them on opposite sides of the central magnetic block 21 along the first direction. Preferably, the first magnetic component 31 and the second magnetic component 32 are fixed on the inner wall of the first shell 10 facing the passive diaphragm 20. By controlling the magnetization direction of the magnetic component 30 and the central magnetic block 21, the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11 can be controlled accordingly.

[0043] Furthermore, the first magnetic member 31 and the second magnetic member 32 are arranged to have the same magnetizing direction, so that the cooperative force of the first magnetic member 31 and the second magnetic member 32 on the central magnetic block 21 is zero when the passive diaphragm 20 is in a non-vibrating state.

[0044] It can also be understood that when the passive diaphragm 20 is in a stationary state, the cooperative force of the first magnetic component 31 and the second magnetic component 32 on the opposite sides of the passive diaphragm 20 is zero. Since the magnetization direction of the magnetic component 30 is the same as that of the first magnetic component 31 and the second magnetic component 32, the cooperative force of the magnetic attraction of the first magnetic component 31 and the second magnetic component 32 on the opposite sides of the central magnetic block 21 is zero.

[0045] Since the second rear cavity 412 is connected to the first rear cavity 112 to form a closed cavity, when the active diaphragm 50 is driven by electricity to vibrate along the first direction in the second accommodating cavity 41, it will affect the internal air pressure between the second rear cavity 412 and the first rear cavity 112, and the fluctuation of the internal air pressure will cause the passive diaphragm 20 to vibrate along the first direction in the first accommodating cavity 11, causing the cooperative force of the attraction of the first magnetic part 31 and the second magnetic part 32 on the central magnetic block 21 to change, and the first magnetic part 31 and the second magnetic part 32 have the same magnetization direction as the central magnetic block 21. Therefore, when the passive diaphragm 20 vibrates along the first direction, the attraction exerted on the central magnetic block 21 will block the vibration of the passive diaphragm 20 in the first accommodating cavity 11, thereby providing negative stiffness for the passive diaphragm 20 in the driver unit 2, so that the driver unit 2 radiates the required sound frequency outward.

[0046] It can be understood that the present invention sets the magnetic component 30 to have the same magnetizing direction as the first magnetic component 31 and the second magnetic component 32, so that when the passive diaphragm 20 vibrates along the first direction, the central magnetic block 21 fixed thereon is attracted by the first magnetic component 31 and the second magnetic component 32 on both sides, thereby blocking the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11.

[0047] Furthermore, since the magnetic component 30 is arranged with the same magnetizing direction as the central magnetic block 21, the attraction formed by the central magnetic block 21 and the magnetic component 30 arranged in the first accommodating cavity 11 will hinder the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11, thereby providing negative stiffness for the passive diaphragm 20. Without increasing the mass of the passive diaphragm 20 and without requiring the stiffness of the passive diaphragm 20 itself, low-frequency sound absorption is achieved with an extremely small depth of the first accommodating cavity 11, thereby weakening the low-frequency vibration of the speaker system and reducing the size requirement of the speaker system.

[0048] It should be explained that negative stiffness refers to the phenomenon that when an object is acted upon by 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 invention, the magnetic component 30 is arranged to have the same magnetization direction as the central magnetic block 21. The attraction of the magnetic component 30 to the central magnetic block 21 blocks the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11, thereby reducing the vibration distance of the passive diaphragm 20 in the first direction, thereby meeting the negative stiffness requirement of the passive diaphragm 20.

[0049] It should be known that when the passive diaphragm 20 is in a non-vibrating state, the cooperative force of the attraction of the first magnetic member 31 and the second magnetic member 32 on the opposite sides of the central magnetic block 21 is zero. When the passive diaphragm 20 needs to vibrate, the active diaphragm 50 is driven to vibrate, which affects the internal air pressure between the second rear cavity 412 and the first rear cavity 112, so that the passive diaphragm 20 vibrates along the first direction in the first accommodating cavity 11. While the passive diaphragm 20 is vibrating, the attraction formed between the central magnetic block 21 and the magnetic component 30 will further block the vibration of the passive diaphragm 20 along the first direction in the first accommodating cavity 11, thereby providing negative stiffness for the passive diaphragm 20 without increasing the mass of the passive diaphragm 20 and without requiring the stiffness of the passive diaphragm 20 itself.

[0050] As an optional embodiment, the first magnetic member 31 and the second magnetic member 32 at least partially overlap with the projection of the central magnetic block 21 in the first direction, thereby ensuring the magnetic attraction effect formed between the first magnetic member 31 and the second magnetic member 32 and the central magnetic block 21.

[0051] Furthermore, the first magnetic member 31 and the second magnetic member 32 may be configured as magnetic blocks 33 . In this case, the first magnetic member 31 and the second magnetic member 32 each include at least one magnetic block 33 .

[0052] Please continue to refer to Figure 1When the first magnetic member 31 and the second magnetic member 32 respectively include a magnetic block 33, it can be observed that the two magnetic blocks 33 are arranged on opposite sides of the passive diaphragm 20 along the first direction, and a certain interval is arranged between the passive diaphragm 20, and the two magnetic blocks 33 partially overlap with the projection of the central magnetic block 21 in the first direction. The present invention arranges one of the magnetic blocks 33 in the first front cavity 111 and the other magnetic block 33 in the first rear cavity 112, and the magnetizing directions of the two magnetic blocks 33 are set to be the same as the magnetizing direction of the central magnetic block 21. In the initial state, the attraction of the central magnetic block 21 by the upper and lower magnetic blocks 33 is balanced, that is, the cooperative force of the attraction of the central magnetic block 21 by the upper and lower magnetic blocks 33 is zero, and the passive diaphragm 20 is in a stationary state.

[0053] Please refer to Figure 2 , is a structural schematic diagram of another passive radiator unit provided by an embodiment of the present invention. When the first magnetic member 31 and the second magnetic member 32 respectively include two magnetic blocks 33, it can be observed that the two magnetic blocks 33 included in the first magnetic member 31 and the two magnetic blocks 33 included in the second magnetic member 32 are arranged on opposite sides of the passive diaphragm 20 along the first direction, and a certain interval is arranged between the passive diaphragm 20, wherein the two magnetic blocks 33 included in the first magnetic member 31 are arranged in the first front cavity 111, and the two magnetic blocks 33 included in the second magnetic member 32 are arranged in the first rear cavity 112, and are fixed on the inner side wall of the first shell 10, and at this time, two magnetic blocks 33 are respectively arranged on opposite sides of the passive diaphragm 20.

[0054] Similarly, the magnetizing direction of the four magnetic blocks 33 is the same as that of the central magnetic block 21. Two magnetic blocks 33 are fixedly arranged above the central magnetic block 21, and two magnetic blocks 33 are also fixedly arranged below the central magnetic block 21. In the initial state, the attraction of the upper and lower magnetic blocks 33 on the central magnetic block 21 is balanced, that is, the cooperative force of the attraction of the four upper and lower magnetic blocks 33 on the central magnetic block 21 is zero, and the passive diaphragm 20 is in a stationary state.

[0055] Of course, you can set Figure 2The two magnetic blocks 33 included in the first magnetic component 31 and the two magnetic blocks 33 included in the second magnetic component 32 do not partially overlap with the projection of the central magnetic block 21 in the first direction. The positions of the upper and lower magnetic blocks 33 are adjusted accordingly so that they partially overlap with the central magnetic block 21 in the first direction. The above settings are all feasible, and those skilled in the art can adjust the setting positions of the magnetic blocks 33 according to actual needs. In principle, as long as the magnetic component 30 is set on the inner wall of the first shell 10 and is arranged opposite to the central magnetic block 21, and when the passive diaphragm 20 does not need to vibrate, the cooperative force of the magnetic attraction of the first magnetic component 31 and the second magnetic component 32 on the opposite sides of the central magnetic block 21 is zero, other settings are feasible. The present invention does not further limit the specific setting positions of the magnetic blocks 33 in the above-mentioned first magnetic component 31 and the second magnetic component 32 and the specific setting number of the magnetic blocks 33.

[0056] As an optional implementation, please continue to refer to Figure 1 The passive diaphragm 20 provided by the present invention includes a vibration part 201, a folding ring part 202 connected to the edge of the vibration part 201, and a fixing part 203 connected to the edge of the folding ring part 202. The passive diaphragm 20 is connected as a whole to the inner wall of the first shell 10 by fixing one end of the fixing part 203 away from the vibration part 201 on the inner wall of the first shell 10, and the first accommodating cavity 11 is divided into a first front cavity 111 and a first rear cavity 112 by the passive diaphragm 20.

[0057] Preferably, the central magnetic block 21 may be fixedly disposed on a side of the vibration part 201 facing away from the first front cavity 111 .

[0058] Please refer to Figure 5 ,for Figure 1 Another structural schematic diagram of the passive radiator unit shown in the figure, the number of the above-mentioned passive diaphragms 20 can also be set to a plurality according to the needs. When two or more passive diaphragms 20 are provided, the plurality of passive diaphragms 20 can be arranged along the first direction inside the first accommodating cavity 11, and a gap is provided between the plurality of passive diaphragms 20 to avoid the influence of the vibration of other passive diaphragms 20 in the first direction due to being too close, and each passive diaphragm 20 needs to be provided with a corresponding central magnetic block 21 to satisfy the one-to-one corresponding setting relationship between the passive diaphragm 20 and the central magnetic block 21.

[0059] Similarly, the first magnetic component 31 and the second magnetic component 32 are arranged on the opposite sides of the central magnetic block 21, and the first magnetic component 31 and the second magnetic component 32 are fixedly arranged on the inner wall of the first shell 10, so that the cooperative force of the first magnetic component 31 and the second magnetic component 32 on the opposite sides of the central magnetic block 21 fixed on several passive diaphragms 20 in the non-vibration state is zero.

[0060] It is understandable that when a plurality of passive diaphragms 20 are disposed in the first shell 10 , a sealed cavity is formed between the first rear cavity 112 and the second rear cavity 412 , and a sealed cavity is also formed between the plurality of passive diaphragms 20 .

[0061] Please continue to refer to Figure 5 In a specific embodiment provided by the present invention, two passive diaphragms 20 are arranged in the first shell 10. It can be observed that a corresponding central magnetic block 21 is fixedly arranged on each passive diaphragm 20, the first magnetic member 31 is fixedly arranged on the inner wall of the first front cavity 111, and the second magnetic member 32 is fixedly arranged on the inner wall of the first rear cavity 112. At this time, a closed cavity is also formed between the two passive diaphragms 20, so that when the active diaphragm 50 vibrates, the passive diaphragm 20 close to the first rear cavity 112 is driven to vibrate, and then the passive diaphragm 20 close to the first front cavity 111 is driven to vibrate. The present invention does not elaborate on its principle.

[0062] Although the above embodiment only shows the arrangement of two passive diaphragms 20 and two central magnetic blocks 21, arranging a plurality of passive diaphragms 20 and corresponding central magnetic blocks 21 is a simple principle extension in the art. If the capacity and cost of the first shell 10 permit, the number and arrangement positions of the above passive diaphragms 20 and central magnetic blocks 21 can be adaptively adjusted to make the speaker system provided by the present invention easier to be tuned to the desired frequency.

[0063] As an optional embodiment, the first shell 10 provided by the present invention is also provided with a first output port 12 for connecting the first front cavity 111 with the outside, so that the speaker system radiates the low-frequency sound generated to the outside of the first shell 10 through the first output port 12, thereby realizing the multi-stage resonance requirement of the speaker system.

[0064] Please refer to Figure 4, which is a structural schematic diagram of another speaker system provided by an embodiment of the present invention, the second rear cavity 412 and the first rear cavity 112 can be connected by at least one extension pipe 43, and a closed space is formed between the first rear cavity 112, the extension pipe 43 and the second rear cavity 412. When the active diaphragm 50 is driven by electricity to vibrate along the first direction in the second accommodating cavity 41, it will affect the internal air pressure between the second rear cavity 412, the extension pipe 43 and the first rear cavity 112, and the fluctuation of the internal air pressure will cause the passive diaphragm 20 to vibrate along the first direction in the first accommodating cavity 11. Since the central magnetic block 21 and the magnetic component 30 have the same magnetization direction, the attraction formed between the passive diaphragm 20 and the central magnetic block 21 when the passive diaphragm 20 vibrates along the first direction will block the vibration of the passive diaphragm 20 in the first accommodating cavity 11, thereby providing negative stiffness for the passive diaphragm 20 in the driver unit 2, so that the driver unit 2 radiates the required sound frequency outward.

[0065] As an optional implementation, please continue to refer to Figure 3 The second rear cavity 412 and the first rear cavity 112 can also be directly connected to form a third rear cavity 62. In this case, there is no need to extend the pipe 43 between the first rear cavity 112 and the second rear cavity 412 for connection, but a closed chamber third rear cavity 62 is directly formed, and the passive diaphragm 20 is further arranged between the first front cavity 111 and the third rear cavity 62, and the active diaphragm 50 is arranged between the second front cavity 411 and the third rear cavity 62.

[0066] As an optional embodiment, the present invention forms a passive radiator unit 1 through the above-mentioned passive diaphragm 20, a central magnetic block 21 arranged on the passive diaphragm 20, and a magnetic component 30 fixed on the inner wall of the first shell 10, and forms a driver unit 2 through the above-mentioned active diaphragm 50, the passive radiator unit 1 is arranged between the first front cavity 111 and the third rear cavity 62, and the driver unit 2 is arranged between the second front cavity 411 and the third rear cavity 62, and the passive diaphragm 20 in the passive radiator unit 1 is driven by the active diaphragm 50 in the driver unit 2.

[0067] Similarly, when the active diaphragm 50 is driven by electricity to vibrate between the second front cavity 411 and the third rear cavity 62, it will affect the internal air pressure between the overall closed cavity formed by the third rear cavity 62. The fluctuation of the internal air pressure will cause the passive diaphragm 20 to vibrate along the first direction in the first accommodating cavity 11, effectively saving the volume required for the speaker system.

[0068] Understandably, please continue to refer to Figure 3When the second rear cavity 412 and the first rear cavity 112 are connected by at least one extension pipe 43, the passive radiator unit 1 can be arranged in the first shell 10, and the driver unit 2 can be arranged in the second shell 40. When the active diaphragm 50 is driven by electricity to vibrate in the second shell 40, it will affect the internal air pressure between the second rear cavity 412, the extension pipe 43 and the first rear cavity 112. The present invention will not be elaborated in detail here.

[0069] As an optional embodiment, the second shell 40 provided by the present invention is also provided with a second output port 42 for connecting the second front cavity 411 with the outside, so that the sound generated by the speaker system is radiated to the outside of the second shell 40 through the second output port 42, thereby realizing the multi-stage resonance requirement of the speaker system.

[0070] Please continue to refer to Figure 4 The speaker system provided by the present invention also includes at least one intermediate cavity 60 connected to the second front cavity 411. The present invention is provided with a third output port 61 on the intermediate cavity 60 for connecting the second front cavity 411 with the outside, so that the speaker system can radiate sound to the outside of the second shell 40 through the third output port 61; regarding the specific number of the above-mentioned intermediate cavity 60 and the extension pipe 43, the present invention does not make further restrictions on this.

[0071] Please refer to Figure 6 , which is a structural diagram of a passive radiator unit provided in conventional technology. It can be observed that the passive radiator unit 1 provided by the present invention is compared with the passive radiator unit provided in conventional technology, and adds a central magnetic block 21 and a magnetic component 30 that forms a magnetic attraction with the central magnetic block 21, thereby providing negative stiffness for the passive diaphragm 20. Under the same frequency design requirements as the passive radiator unit in conventional technology, the mass of the passive diaphragm can be effectively reduced and the low-frequency vibration can be weakened.

[0072] Please refer to Figure 7 ,for Figure 1 From the equivalent circuit diagram of the passive radiator unit shown in the figure, it can be observed that the present invention, by arranging a central magnetic block 21 and a magnetic component 30 in the passive radiator unit 1, is equivalent to adding an equivalent negative stiffness voltage source to the structure of the conventional passive radiator unit 1, thereby reducing the equivalent stiffness of the passive diaphragm 20.

[0073] Please refer to Figure 8 ,for Figure 1 and Figure 6 The boost level curve comparison diagram of the passive radiator unit shown in the figure, Figure 8 The horizontal axis is the frequency in Hz, and the vertical axis is the sound pressure value in dB; Figure 8The curve marked with the middle triangle S71 is the frequency response curve of the passive radiator unit provided in the conventional technology. Figure 8 The curve marked with the middle line segment S72 is the frequency response curve of the passive radiator unit provided by the present invention. Through comparison, it can be obviously observed that the passive radiator unit provided by the present invention has a lower resonant frequency and achieves better low-frequency sensitivity.

[0074] Please refer to Fig. 9 ,for Figure 1 and Figure 6 The displacement curve comparison diagram of the passive radiator unit is shown. Fig. 9 The abscissa is the frequency in Hz, and the ordinate is the displacement of the active diaphragm 50 and the passive diaphragm 20 vibrating in the first direction in m; Fig. 9 The curves marked with a triangle S81 and a diamond S82 are frequency displacement curves of the active diaphragm and the passive diaphragm in the passive radiator unit provided in the conventional technology. Fig. 9 The curves of the middle rectangular mark S83 and the hourglass-shaped mark S84 are the frequency displacement curves of the active diaphragm 50 and the passive diaphragm 20 in the passive radiator unit 1 provided by the present invention. By comparison, it can be observed that the passive radiator unit 1 provided by the present invention reduces the resonant frequency of the passive diaphragm 20 and increases the low-frequency displacement generated by the passive diaphragm 20 at low frequencies, thereby effectively improving the low-frequency performance of the passive radiator unit 1.

[0075] For further information, please refer to Fig.10 ,for Figure 3 From the equivalent circuit diagram of the loudspeaker system shown in FIG. 1 , it can be observed that the loudspeaker system provided by the present invention adds an equivalent negative stiffness voltage source compared to the loudspeaker system in conventional technology, so that the negative stiffness of the passive diaphragm 20 can be adjusted.

[0076] For details, please refer to Fig.11 , a speaker system provided in conventional technology and Figure 3 Comparison of boost level curves for the speaker systems shown. Fig.11 The horizontal axis is the frequency in Hz, and the vertical axis is the sound pressure value in dB; Fig.11 The solid line S101 is a frequency response curve of a speaker system provided in conventional technology. Fig.11 The middle dotted line S102 is the frequency response curve of the passive radiator unit provided by the present invention. Through comparison, it can be obviously observed that the speaker system provided by the present invention achieves a significant improvement in the low-frequency SPL (Sound Pressure Level) and a weakening of the low-frequency vibration on the basis of maintaining the same low-frequency resonant frequency.

[0077] Please refer to Fig.12 , a speaker system provided in conventional technology and Figure 3The comparison diagram of the force on the diaphragm of the speaker system shown in the figure changes with frequency. Fig.12 The horizontal axis is the frequency in Hz, and the vertical axis is the force on the diaphragm in N; Fig.12 The solid lines S111 and S112 are curves showing the force of the active diaphragm and the passive diaphragm changing with the frequency in conventional technology. Fig.12 The middle dotted lines S113 and S114 are curves showing how the forces on the active diaphragm 50 and the passive diaphragm 20 in the speaker system provided by the present invention vary with frequency. By comparison, it can be clearly observed that the displacement of the active diaphragm 50 and the passive diaphragm 20 in the speaker system provided by the present invention is smaller at low frequencies, so the overall size requirement for the speaker system is smaller, which can effectively meet the design requirements of the micro-speaker.

[0078] 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 active diaphragm 50 to vibrate can be set in the electronic device to indirectly drive the passive diaphragm 20 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.

[0079] 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; at least one passive diaphragm, wherein the passive diaphragm is disposed in the first accommodating cavity, dividing the first accommodating cavity into a first front cavity and a first rear cavity; a second housing, wherein a second accommodating cavity is disposed in the second housing, an active diaphragm is disposed in the second accommodating cavity, the active diaphragm divides the second accommodating cavity into a second front cavity and a second rear cavity, and the second rear cavity is connected with the first rear cavity to form a closed cavity; A central magnetic block is fixed to a side of the passive diaphragm facing away from the first front cavity, and the central magnetic block moves along with the vibration of the passive diaphragm along the first direction in the first accommodating cavity; A magnetic component, the magnetic component includes a first magnetic member arranged on the inner side wall of the first front cavity and a second magnetic member arranged on the inner side wall of the first rear cavity, the first magnetic member and the second magnetic member have the same magnetization direction as the central magnetic block, and the cooperative force exerted by the first magnetic member and the second magnetic member on the central magnetic block is zero when the passive diaphragm is in a non-vibrating state.

2. The speaker system according to claim 1, wherein: The first magnetic member and the second magnetic member at least partially overlap with projections of the central magnetic block in the first direction, respectively.

3. The speaker system according to claim 1, wherein: 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.

4. The speaker system according to claim 1, wherein: When the number of the passive diaphragms is configured to be several, the number of the central magnetic blocks is also several and they are arranged one-to-one corresponding to the passive diaphragms, and the several passive diaphragms are arranged in the first accommodating cavity along the first direction and there are intervals between them.

5. The speaker system according to claim 1, wherein: The first rear cavity and the second rear cavity are connected through at least one extending pipe to form the closed cavity.

6. The speaker system according to claim 1, wherein: The first rear cavity and the second rear cavity are directly connected to form a third rear cavity. The passive diaphragm is arranged between the first front cavity and the third rear cavity, and the active diaphragm is arranged between the second front cavity and the third rear cavity.

7. The speaker system according to claim 1, wherein: The second shell is provided with a second output port for connecting the second front cavity with the outside, and the speaker system radiates sound to the outside of the second shell through the second output port.

8. The speaker system according to claim 1, wherein: The speaker system also includes at least one intermediate cavity connected to the second front cavity, and the intermediate cavity is provided with a third output port for connecting the second front cavity with the outside, and the speaker system radiates sound to the outside of the second shell through the third output port.

9. An electronic device, characterized in that: The electronic device comprises the speaker system according to any one of claims 1-8.

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