Loudspeaker system and electronic device

Abstract

Provided in the present invention are a loudspeaker system and an electronic device. The loudspeaker system comprises a first housing, with a first accommodating cavity provided inside; at least one passive diaphragm, which is disposed inside the first accommodating cavity and divides the first accommodating cavity into a first front cavity and a first rear cavity; a second housing, with a second accommodating cavity provided inside, wherein an active diaphragm is disposed inside the second accommodating cavity and divides the second accommodating cavity into a second front cavity and a second rear cavity, and the second rear cavity is in communication with the first rear cavity to form a closed cavity; a central magnetic block, which is fixed to the side of the passive diaphragm facing away from the first front cavity; and a magnetic assembly, which comprises a first magnetic member disposed in the first front cavity and a second magnetic member disposed in the first rear cavity, the first magnetic member and the second magnetic member having the same magnetization direction as the central magnetic block, and the central magnetic block experiencing a zero cooperative force of the first magnetic member and the second magnetic member in a non-vibrating state of the passive diaphragm. The present invention can reduce the equivalent stiffness of the passive diaphragm, attenuate the low-frequency vibration sensation of the loudspeaker system, and improve the low-frequency performance.

Description

loudspeaker systems and electronic equipment Technical Field

[0001] This invention relates to the field of loudspeaker technology, and in particular to a loudspeaker system and electronic device. Background Technology

[0002] With the rapid development of communication technology, electronic products are being updated and replaced at an increasingly faster pace. Users are significantly increasing the time and frequency of use of electronic products and placing higher demands on the music functions that electronic products can achieve. As a result, loudspeakers, which are used as bass units, are now widely used in smart electronic products. There are many parameters used to evaluate the sound quality of loudspeakers, such as resonant frequency and low-frequency sensitivity. Loudspeakers mainly rely on the vibration of the diaphragm to drive the air to vibrate and produce sound. When the stiffness of the diaphragm is high, it will increase the system stiffness of the loudspeaker, resulting in a higher resonant frequency and poorer low-frequency sensitivity.

[0003] The low-frequency performance of conventional passive radiator loudspeakers is mainly limited by the speaker's own stiffness and mass. A diaphragm with excessive mass will aggravate the speaker's vibration and reduce the user experience, while a diaphragm with low stiffness is difficult to manufacture, has a low yield, and is not easy to implement in engineering applications.

[0004] Therefore, it is necessary to provide a new loudspeaker system to solve the above-mentioned technical problems. Technical issues

[0005] The purpose of this invention is to provide a speaker system and electronic device that can provide negative stiffness to the diaphragm and reduce the low-frequency vibration of the speaker. Technical solutions

[0006] To address the aforementioned technical problems, the present invention provides a loudspeaker system, comprising:

[0007] A first housing, wherein a first receiving cavity is provided inside the first housing;

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

[0009] The second housing has a second receiving cavity inside, and an active diaphragm is provided inside the second receiving cavity. The active diaphragm divides the second receiving cavity into a second front cavity and a second rear cavity. The second rear cavity is connected to the first rear cavity to form a sealed cavity.

[0010] A central magnetic block is fixed to the side of the passive diaphragm facing away from the first front cavity. The central magnetic block moves along the first direction as the passive diaphragm vibrates within the first receiving cavity.

[0011] A magnetic component, comprising a first magnetic element disposed on the inner sidewall of the first front cavity and a second magnetic element disposed on the inner sidewall of the first rear cavity, wherein the first magnetic element and the second magnetic element are magnetized in the same direction as the central magnetic block, and the central magnetic block is subjected to zero force by the combined force of the first magnetic element and the second magnetic element in the non-vibrating state of the passive diaphragm.

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

[0013] Preferably, the first housing 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 housing through the first output port.

[0014] Preferably, when the number of passive diaphragms is configured to be several, the number of central magnetic blocks is also several and is arranged in a one-to-one correspondence with the passive diaphragms. The several passive diaphragms are arranged in the first receiving 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 by at least one extended pipe to form the sealed 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 disposed between the first front cavity and the third rear cavity, and the active diaphragm is disposed between the second front cavity and the third rear cavity.

[0017] Preferably, the second housing 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 housing through the second output port.

[0018] Preferably, the loudspeaker system further includes at least one intermediate cavity communicating with the second front cavity, the intermediate cavity being provided with a third output port for connecting the second front cavity with the outside, and the loudspeaker system radiating sound to the outside of the second housing through the third output port.

[0019] Based on the above-described speaker system, the present invention also provides an electronic device comprising the speaker system described in any of the preceding claims. Beneficial effects

[0020] The beneficial effects of this invention are as follows: A central magnetic block capable of vibrating along a first direction is provided on the passive diaphragm. A magnetic component with the same magnetization direction as the central magnetic block is provided inside the first housing. When the active diaphragm is driven to vibrate, it affects the air pressure in the sealed cavity formed by the second and first rear cavities, causing the passive diaphragm to vibrate along the first direction within the first receiving cavity. This causes a change in the combined force of the first and second magnetic components on the central magnetic block. When the passive diaphragm vibrates along the first direction, the attraction between the central magnetic block and the magnetic component blocks the vibration of the passive diaphragm within the first receiving cavity. This invention reduces the equivalent stiffness of the passive diaphragm by introducing a magnetic component. By setting the first and second magnetic components to have the same magnetization direction as the central magnetic block, low-frequency sound absorption is achieved with a very small first receiving cavity depth without increasing the mass of the passive diaphragm or requiring stiffness from the passive diaphragm itself. This reduces the size requirement of the speaker, weakens the low-frequency vibration of the speaker system, and effectively improves the low-frequency performance of the speaker system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this invention, and other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 is a schematic diagram of the passive radiator unit provided in an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of another passive radiator unit provided in an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the loudspeaker system provided in an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of another loudspeaker system provided in an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of another structure of the passive radiator unit shown in Figure 1.

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

[0028] Figure 7 is the equivalent circuit diagram of the passive radiator unit shown in Figure 1;

[0029] Figure 8 is a comparison of the boost stage curves of the passive radiator unit shown in Figure 1 and Figure 6.

[0030] Figure 9 is a comparison of the displacement curves of the passive radiator unit shown in Figure 1 and Figure 6.

[0031] Figure 10 is the equivalent circuit diagram of the loudspeaker system shown in Figure 3;

[0032] Figure 11 is a comparison of the boost stage curves of the loudspeaker system provided in conventional technology and the loudspeaker system shown in Figure 3.

[0033] Figure 12 is a comparison of the force on the diaphragm as a function of frequency in a loudspeaker system provided in conventional technology and the loudspeaker system shown in Figure 3.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1- Passive radiator unit; 2- Driver unit; 10- First housing; 11- First receiving cavity; 111- First front cavity; 112- First rear cavity; 12- First output port; 20- Passive diaphragm; 201- Vibrating part; 202- Folded ring part; 203- Fixing part; 21- Central magnetic block; 30- Magnetic assembly; 31- First magnetic element; 32- Second magnetic element; 33- Magnetic block; 40- Second housing; 41- Second receiving cavity; 411- Second front cavity; 412- Second rear cavity; 42- Second output port; 43- Extension pipe; 50- Active diaphragm; 60- Intermediate cavity; 61- Third output port; 62- Third rear cavity. Embodiments of the present invention

[0036] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0037] Please refer to Figures 1-12. This embodiment of the invention provides a loudspeaker system and electronic device that can reduce the equivalent stiffness of the passive diaphragm, weaken the low-frequency vibration of the loudspeaker system, and improve the low-frequency performance of the loudspeaker system.

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

[0039] As an optional implementation, the present invention provides a first receiving cavity 11 in the first housing 10, and a passive diaphragm 20 is disposed in the first receiving cavity 11 so that it can vibrate in the first receiving cavity 11 along a first direction. By disposing of the passive diaphragm 20 in the first receiving cavity 11, the first receiving cavity 11 of the first housing 10 is divided into two chambers: a first front cavity 111 and a first rear cavity 112.

[0040] Further, please refer to Figure 3, which is a structural schematic diagram of the loudspeaker system provided in an embodiment of the present invention. The present invention has a second receiving cavity 41 correspondingly provided in the second housing 40. The active diaphragm 50 is disposed in the second receiving cavity 41 so that it can vibrate in the first direction in the second receiving cavity 41. The active diaphragm 50 divides the second receiving cavity 41 into two chambers, 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 sealed cavity. The vibration of the active diaphragm 50 inside the second housing 40 is achieved by electric drive.

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

[0042] In this embodiment of the invention, the magnetic component 30 includes a first magnetic element 31 and a second magnetic element 32. The first magnetic element 31 and the second magnetic element 32 are respectively disposed in the first front cavity 111 and the first rear cavity 112, and are disposed on opposite sides of the central magnetic block 21 along the first direction. Preferably, the first magnetic element 31 and the second magnetic element 32 are fixed on the inner sidewall of the first housing 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 in the first receiving cavity 11 along the first direction can be controlled accordingly.

[0043] Furthermore, the magnetization directions of the first magnetic element 31 and the second magnetic element 32 are set to be the same, so that the combined force of the first magnetic element 31 and the second magnetic element 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 static state, the combined force of the first magnetic element 31 and the second magnetic element 32 on the opposite sides of the passive diaphragm 20 is zero. Since the magnetic component 30 and the first magnetic element 31 and the second magnetic element 32 have the same magnetization direction, the combined force of the magnetic attraction of the central magnetic block 21 on the opposite sides of the first magnetic element 31 and the second magnetic element 32 is zero.

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

[0046] It is understood that by setting the magnetic component 30 to have the same magnetization direction as the first magnetic element 31 and the second magnetic element 32, the present invention can block the vibration of the passive diaphragm 20 in the first receiving cavity 11 in the first direction when the passive diaphragm 20 vibrates in the first direction. The central magnetic block 21 fixed on it is attracted by the first magnetic element 31 and the second magnetic element 32 on both sides.

[0047] Furthermore, since the magnetic component 30 and the central magnetic block 21 are magnetized in the same direction, the attraction formed by the central magnetic block 21 and the magnetic component 30 in the first receiving cavity 11 will hinder the vibration of the passive diaphragm 20 in the first receiving cavity 11 along the first direction, thereby providing negative stiffness to the passive diaphragm 20. Without increasing the mass of the passive diaphragm 20 or requiring stiffness of the passive diaphragm 20 itself, low-frequency sound absorption is achieved with a very small depth of the first receiving cavity 11, which weakens the low-frequency vibration of the speaker system and reduces the size requirements of the speaker system.

[0048] It should be noted 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 increases with the increase of the external force, while negative stiffness is the opposite phenomenon, that is, the deformation of an object decreases as the external force increases. In this embodiment of the invention, the magnetic component 30 and the central magnetic block 21 are magnetized in the same direction. The attraction force of the magnetic component 30 on the central magnetic block 21 blocks the vibration of the passive diaphragm 20 in the first receiving cavity 11 along the first direction, thereby reducing the vibration distance of the passive diaphragm 20 in the first direction and thus meeting the negative stiffness requirement of the passive diaphragm 20.

[0049] It should be understood that when the passive diaphragm 20 is in a non-vibrating state, the combined force of the attraction between the central magnetic block 21 and the attraction between the first magnetic element 31 and the second magnetic element 32 on opposite sides is zero. When the passive diaphragm 20 needs to vibrate, the active diaphragm 50 is driven to vibrate, affecting the internal air pressure between the second rear cavity 412 and the first rear cavity 112, causing the passive diaphragm 20 to vibrate in the first receiving cavity 11 along the first direction. 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 in the first receiving cavity 11 along the first direction, thereby providing negative stiffness to the passive diaphragm 20 without increasing its mass or requiring stiffness.

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

[0051] Furthermore, the first magnetic element 31 and the second magnetic element 32 can be configured as magnetic blocks 33, in which case both the first magnetic element 31 and the second magnetic element 32 include at least one magnetic block 33.

[0052] Please refer to Figure 1. When the first magnetic element 31 and the second magnetic element 32 each 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, with a certain gap between them. The projections of the two magnetic blocks 33 and the central magnetic block 21 in the first direction partially overlap. In this invention, one magnetic block 33 is placed in the first front cavity 111 and the other magnetic block 33 is placed in the first rear cavity 112. The magnetization direction of the two magnetic blocks 33 is the same as that of the central magnetic block 21. In the initial state, the attraction force of the central magnetic block 21 on the upper and lower magnetic blocks 33 is balanced, that is, the combined force of the attraction force of the two magnetic blocks 33 on the central magnetic block 21 is zero. At this time, the passive diaphragm 20 is in a static state.

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

[0054] Similarly, the magnetization 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 force of the central magnetic block 21 on the upper and lower magnetic blocks 33 is balanced, that is, the combined force of the attraction force of the four magnetic blocks 33 on the central magnetic block 21 is zero. At this time, the passive diaphragm 20 is in a static state.

[0055] Of course, it is possible to set up the two magnetic blocks 33 included in the first magnetic component 31 and the two magnetic blocks 33 included in the second magnetic component 32 shown in Figure 2 so that their projections in the first direction do not overlap. The positions of the upper and lower magnetic blocks 33 can be adjusted accordingly so that they partially overlap with the central magnetic block 21 in the first direction. All of the above settings are feasible. Those skilled in the art can adjust the setting position of the magnetic blocks 33 according to actual needs. In principle, as long as the magnetic component 30 is set on the inner side wall of the first housing 10 and is opposite to the central magnetic block 21, and the combined force of the magnetic attraction force of the central magnetic block 21 on the opposite sides of the first magnetic component 31 and the second magnetic component 32 is zero when the passive diaphragm 20 does not need to vibrate, other settings are feasible. The present invention does not further limit the specific setting position of the magnetic blocks 33 in the first magnetic component 31 and the second magnetic component 32 and the specific number of magnetic blocks 33.

[0056] As an optional implementation, please continue to refer to FIG1. ​​The passive diaphragm 20 provided by the present invention includes a vibrating part 201, a folded ring part 202 connected to the edge of the vibrating part 201, and a fixing part 203 connected to the edge of the folded ring part 202. By fixing one end of the fixing part 203 away from the vibrating part 201 to the inner sidewall of the first housing 10, the passive diaphragm 20 is connected to the inner sidewall of the first housing 10 as a whole. The passive diaphragm 20 divides the first receiving cavity 11 into a first front cavity 111 and a first rear cavity 112.

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

[0058] Please refer to Figure 5, which is another structural schematic diagram of the passive radiator unit shown in Figure 1. The number of passive diaphragms 20 can also be set to several as needed. When there are two or more passive diaphragms 20, several passive diaphragms 20 can be arranged in the first receiving cavity 11 along the first direction, and there is a gap between several passive diaphragms 20 to avoid the distance being too close and affecting the vibration of other passive diaphragms 20 in the first direction. Each passive diaphragm 20 needs to be provided with a corresponding central magnetic block 21 to satisfy the one-to-one correspondence between the passive diaphragm 20 and the central magnetic block 21.

[0059] Similarly, a first magnetic element 31 and a second magnetic element 32 are provided on opposite sides of the central magnetic block 21. The first magnetic element 31 and the second magnetic element 32 are fixedly disposed on the inner side wall of the first housing 10, so that the combined force of the first magnetic element 31 and the second magnetic element 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 provided in the first housing 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 refer to Figure 5. In a specific embodiment of the present invention, two passive diaphragms 20 are provided inside the first housing 10. It can be observed that a corresponding central magnetic block 21 is fixedly provided on each passive diaphragm 20. The first magnetic element 31 is fixedly provided on the inner wall of the first front cavity 111, and the second magnetic element 32 is fixedly provided on the inner wall of the first rear cavity 112. At this time, a sealed cavity is also formed between the two passive diaphragms 20. Thus, when the active diaphragm 50 vibrates, it drives the passive diaphragm 20 near the first rear cavity 112 to vibrate, and then drives the passive diaphragm 20 near the first front cavity 111 to vibrate. The principle of the present invention will not be described in detail.

[0062] Although the above embodiments only show the arrangement of two passive diaphragms 20 and two central magnets 21, setting up a number of passive diaphragms 20 and corresponding central magnets 21 is a simple extension of the principle in the art. As long as the volume and cost of the first housing 10 allow, the number and arrangement of the passive diaphragms 20 and central magnets 21 can be adaptively adjusted so that the speaker system provided by the present invention can be more easily tuned to the required frequency.

[0063] As an optional implementation, the first housing 10 provided by the present invention is further provided with a first output port 12 for connecting the first front cavity 111 and the outside, so that the speaker system can radiate the generated low-frequency sound to the outside of the first housing 10 through the first output port 12, thereby realizing the multi-level resonance requirement of the speaker system.

[0064] Please refer to Figure 4, which is a schematic diagram of another loudspeaker system provided in 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. At this time, a sealed 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 in the second receiving cavity 41 along the first direction, it will affect the internal air pressure between the second rear cavity 412, the extension pipe 43 and the first rear cavity 112. The fluctuation of the internal air pressure will cause the passive diaphragm 20 to vibrate in the first receiving cavity 11 along the first direction. Since the magnetization direction of the central magnet 21 is the same as that of the magnetic component 30, the attraction formed between the passive diaphragm 20 and the central magnet 21 when the passive diaphragm 20 vibrates in the first direction will block the vibration of the passive diaphragm 20 in the first receiving cavity 11, thereby providing negative stiffness to the passive diaphragm 20 in the driver unit 2 so that the driver unit 2 can radiate the required sound frequency outward.

[0065] As an optional implementation, please continue to refer to Figure 3. Alternatively, the second rear cavity 412 and the first rear cavity 112 can 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 to connect them. Instead, a closed chamber, the third rear cavity 62, is directly formed. Furthermore, the passive diaphragm 20 is placed between the first front cavity 111 and the third rear cavity 62, and the active diaphragm 50 is placed between the second front cavity 411 and the third rear cavity 62.

[0066] As an optional implementation, the present invention forms a passive radiator unit 1 by means of the passive diaphragm 20, a central magnetic block 21 disposed on the passive diaphragm 20, and a magnetic component 30 fixed on the inner sidewall of the first housing 10, and forms a driver unit 2 by means of the active diaphragm 50. The passive radiator unit 1 is disposed between the first front cavity 111 and the third rear cavity 62, and the driver unit 2 is disposed between the second front cavity 411 and the third rear cavity 62. 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 sealed chambers formed by the third rear cavity 62. The fluctuation of the internal air pressure will cause the passive diaphragm 20 to vibrate in the first receiving cavity 11 along the first direction, effectively saving the volume required for the speaker system.

[0068] It is understood that, referring to Figure 3, when 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 placed inside the first housing 10 and the driver unit 2 can be placed inside the second housing 40. When the active diaphragm 50 is driven by electricity to vibrate inside the second housing 40, it will affect the internal air pressure between the second rear cavity 412, the extension pipe 43 and the first rear cavity 112. This invention will not be elaborated further here.

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

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

[0071] Please refer to Figure 6, which is a structural schematic 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, compared with the passive radiator unit provided in conventional technology, adds a central magnetic block 21 and a magnetic component 30 that forms a magnetic attraction force with the central magnetic block 21, thereby providing negative stiffness for the passive diaphragm 20. Under the requirement of the same frequency design 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, which is the equivalent circuit diagram of the passive radiator unit shown in Figure 1. It can be observed that by setting a central magnetic block 21 and a magnetic component 30 in the passive radiator unit 1, the present invention adds 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, which is a comparison diagram of the boost stage curves of the passive radiator unit shown in Figure 1 and Figure 6. In Figure 8, the horizontal axis represents frequency in Hz, and the vertical axis represents sound pressure level in dB. The curve marked with triangle S71 in Figure 8 is the frequency response curve of the passive radiator unit provided in conventional technology, and the curve marked with line segment S72 in Figure 8 is the frequency response curve of the passive radiator unit provided by the present invention. By comparison, it can be clearly 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 Figure 9, which is a comparison diagram of the displacement curves of the passive radiator unit shown in Figure 1 and Figure 6. In Figure 9, the horizontal axis represents the frequency in Hz, and the vertical axis represents the displacement of the active diaphragm 50 and the passive diaphragm 20 in the first direction in meters. The curves marked with triangle S81 and rhombus S82 in Figure 9 are the frequency displacement curves of the active diaphragm and the passive diaphragm in the passive radiator unit provided in conventional technology. The curves marked with rectangle S83 and hourglass S84 in Figure 9 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] Furthermore, referring to Figure 10, which is the equivalent circuit diagram of the loudspeaker system shown in Figure 3, 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 the conventional technology, thus enabling the adjustment of the negative stiffness of the passive diaphragm 20.

[0076] Specifically, please refer to Figure 11, which is a comparison of the boost stage curves of the loudspeaker system provided in conventional technology and the loudspeaker system shown in Figure 3. In Figure 11, the horizontal axis represents frequency in Hz, and the vertical axis represents sound pressure level in dB. The solid line S101 in Figure 11 is the frequency response curve of the loudspeaker system provided in conventional technology, and the dashed line S102 in Figure 11 is the frequency response curve of the passive radiator unit provided by the present invention. By comparison, it can be clearly observed that the loudspeaker system provided by the present invention achieves a significant improvement in low-frequency SPL (Sound Pressure Level) and a reduction in low-frequency vibration while maintaining the same low-frequency resonant frequency.

[0077] Please refer to Figure 12, which is a comparison of the force on the diaphragm of a speaker system provided in conventional technology and the speaker system shown in Figure 3 as a function of frequency. In Figure 12, the horizontal axis represents frequency in Hz, and the vertical axis represents the force on the diaphragm in N. The solid lines S111 and S112 in Figure 12 are the curves of the force on the active and passive diaphragms of the speaker system provided by the present invention as a function of frequency. The dashed lines S113 and S114 in Figure 12 are the curves of the force on the active diaphragm 50 and the passive diaphragm 20 of the speaker system provided by the present invention as a function of frequency. By comparison, it can be clearly observed that the active diaphragm 50 and the passive diaphragm 20 of the speaker system provided by the present invention have smaller diaphragm displacement at low frequencies. Therefore, the overall size requirement of the speaker system is smaller, which can effectively meet the design requirements of miniature speakers.

[0078] Based on the above-described speaker system, the present invention also provides an electronic device that can be installed in electronic devices such as mobile phones, tablets, and speakers. By applying the above-described speaker system to the electronic device, a controller for driving the active diaphragm 50 to vibrate can be installed in the electronic device to indirectly drive the passive diaphragm 20 to vibrate. For other details regarding the implementation of the above-described technical solution by the electronic device, please refer to the description of the speaker system provided in the above-described embodiments of the invention, which will not be repeated here.

[0079] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A loudspeaker system, characterized in that, include: A first housing, wherein a first receiving cavity is provided inside the first housing; At least one passive diaphragm is disposed in the first receiving cavity, dividing the first receiving cavity into a first front cavity and a first rear cavity; The second housing has a second receiving cavity inside, and an active diaphragm is provided inside the second receiving cavity. The active diaphragm divides the second receiving cavity into a second front cavity and a second rear cavity. The second rear cavity is connected to the first rear cavity to form a sealed cavity. A central magnetic block is fixed to the side of the passive diaphragm facing away from the first front cavity. The central magnetic block moves along the first direction as the passive diaphragm vibrates within the first receiving cavity. A magnetic component, comprising a first magnetic element disposed on the inner sidewall of the first front cavity and a second magnetic element disposed on the inner sidewall of the first rear cavity, wherein the first magnetic element and the second magnetic element are magnetized in the same direction as the central magnetic block, and the central magnetic block is subjected to zero force by the combined force of the first magnetic element and the second magnetic element in the non-vibrating state of the passive diaphragm.

2. The loudspeaker system as claimed in claim 1, characterized in that: The first magnetic element and the second magnetic element respectively at least partially overlap with the projection of the central magnetic block in the first direction.

3. The loudspeaker system as claimed in claim 1, characterized in that: The first housing 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 housing through the first output port.

4. The loudspeaker system as claimed in claim 1, characterized in that: When the number of passive diaphragms is configured to be several, the number of central magnetic blocks is also several and is arranged in a one-to-one correspondence with the passive diaphragms. The several passive diaphragms are arranged in the first receiving cavity along the first direction and are spaced apart from each other.

5. The loudspeaker system as claimed in claim 1, characterized in that: The first rear cavity and the second rear cavity are connected by at least one extension pipe to form the sealed cavity.

6. The loudspeaker system as claimed in claim 1, characterized in that: The first rear cavity and the second rear cavity are directly connected to form a third rear cavity. The passive diaphragm is disposed between the first front cavity and the third rear cavity, and the active diaphragm is disposed between the second front cavity and the third rear cavity.

7. The loudspeaker system as claimed in claim 1, characterized in that: The second housing 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 housing through the second output port.

8. The loudspeaker system as claimed in claim 1, characterized in that: The loudspeaker system further includes at least one intermediate cavity connected to the second front cavity. The intermediate cavity is provided with a third output port for connecting the second front cavity to the outside. The loudspeaker system radiates sound to the outside of the second housing through the third output port.

9. An electronic device, characterized in that: The electronic device includes a speaker system as described in any one of claims 1-8.

Images