Loudspeaker and electronic equipment

Abstract

The utility model provides a loudspeaker and electronic equipment. The loudspeaker comprises a magnetic circuit assembly, a diaphragm assembly and a voice coil assembly. A magnetic gap is formed in the magnetic circuit assembly. The voice coil assembly comprises two voice coils which are connected in series or in parallel, the two voice coils are a first voice coil and a second voice coil which are located in the magnetic gap respectively, and the two voice coils are fixedly connected with the vibrating diaphragm assembly through frameworks respectively. And one of the two voice coils is arranged above the center of a magnetic induction line gathering and concentrating area corresponding to the magnetic circuit assembly, and the other voice coil is arranged below the center of the magnetic induction line gathering and concentrating area corresponding to the magnetic circuit assembly. The loudspeaker and the electronic equipment provided by the utility model have relatively small resonant frequency and relatively small distortion, and the sound production quality of the loudspeaker is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic products, in particular to a loudspeaker and an electronic device. BACKGROUND

[0002] At present, the loudspeaker product is involved in some sound-producing electronic products such as car audio, small sound box and some multimedia devices. With the development demand of market lightness and thinness, the size of the sound-producing electronic products is continuously reduced, and the size of the loudspeaker product in the sound-producing electronic products is also required to be reduced. However, the performance index of the loudspeaker is often sacrificed when the size of the loudspeaker is reduced in the prior art, resulting in the problems of high resonance frequency and high distortion of the loudspeaker. SUMMARY

[0003] Based on this, the present application provides a loudspeaker and an electronic device to improve the problems of high resonance frequency and high distortion of the loudspeaker in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the embodiment of the present application is as follows:

[0005] On the one hand, the present application provides a loudspeaker, comprising a magnetic circuit assembly, a diaphragm assembly and a voice coil assembly;

[0006] The magnetic circuit assembly is formed with a magnetic gap;

[0007] The voice coil assembly comprises two voice coils in series or in parallel, the two voice coils are respectively a first voice coil and a second voice coil located in the magnetic gap, the two voice coils are fixedly connected through a skeleton and the diaphragm assembly, and one of the two voice coils is arranged above the center of the magnetic flux concentration area corresponding to the magnetic circuit assembly, and the other is arranged below the center of the magnetic flux concentration area corresponding to the magnetic circuit assembly.

[0008] In one embodiment, the loudspeaker further comprises a magnetic cover, and the magnetic circuit assembly is fixedly connected with the magnetic cover;

[0009] The magnetic circuit assembly comprises an inner magnetic circuit assembly and an outer magnetic circuit assembly, the outer magnetic circuit assembly surrounds the inner magnetic circuit assembly, and the magnetic gap is formed between the inner magnetic circuit assembly and the outer magnetic circuit assembly.

[0010] In one embodiment, the height of the inner magnetic circuit assembly and the outer magnetic circuit assembly relative to the magnetic cover is equal, the height of the two voice coil assemblies is unequal, one of the two voice coils is located above the center of the magnetic flux concentration area, and the other is located below the center of the magnetic flux concentration area.

[0011] In one of the embodiments, the inner magnetic circuit assembly and the outer magnetic circuit assembly have different heights relative to the magnetic cover, one of the voice coils is located above the center of the magnetic flux concentration area, and the other is located below the center of the magnetic flux concentration area.

[0012] In one of the embodiments, the magnetic circuit assembly further comprises a secondary outer magnetic circuit assembly, which is arranged between the inner magnetic circuit assembly and the outer magnetic circuit assembly, the height of the secondary outer magnetic circuit assembly relative to the magnetic cover is defined as H1, the height of the inner magnetic circuit assembly relative to the magnetic cover is defined as H2, and the height of the outer magnetic circuit assembly relative to the magnetic cover is defined as H3, H1≥H2 and H1≥H3.

[0013] In one of the embodiments, the inner magnetic circuit assembly comprises an inner magnet and an inner pole piece arranged on the magnetic cover in sequence, the outer magnetic circuit assembly comprises an outer magnet and an outer pole piece arranged on the magnetic cover in sequence, and the secondary outer magnetic circuit assembly comprises a secondary outer pole piece, the height of the surface of the secondary outer pole piece close to the magnetic cover relative to the magnetic cover is defined as h1, h1≤H2 and h1≤H3.

[0014] In one of the embodiments, the height of the inner magnet relative to the magnetic cover is defined as h2, and the height of the outer magnet relative to the magnetic cover is defined as h3, h1≤h2 and h1≤h3.

[0015] In one of the embodiments, one of the voice coils located above the center of the magnetic flux concentration area is a first voice coil, and one of the voice coils located below the center of the magnetic flux concentration area is a second voice coil, the height of the surface of the first voice coil away from the magnetic cover relative to the magnetic cover is defined as H5, and the height of the surface of the second voice coil away from the magnetic cover relative to the magnetic cover is defined as H6, H5≥H6.

[0016] In one of the embodiments, the loudspeaker further comprises a basket, the diaphragm assembly comprises a ball top, a diaphragm and a damper, the inner edge of the diaphragm is fixedly connected with the outer edge of the ball top, and the outer edge of the diaphragm is fixedly connected with the basket, the inner edge of the damper is fixedly connected with the second voice coil, and the outer edge of the damper is fixedly connected with the basket.

[0017] In another aspect, the embodiments of the present application provide an electronic device comprising the loudspeaker as described above.

[0018] This application has at least the following beneficial effects: The loudspeaker and electronic device provided by this application have a voice coil assembly comprising two voice coils connected in series or in parallel. The length of the two voice coils is reduced compared to a single voice coil structure, thus helping to reduce the overall size of the loudspeaker. Simultaneously, the two voice coils are fixedly connected by a frame and a diaphragm assembly, thereby increasing the mass of the vibrating system. According to the formula, increasing the vibrating mass can reduce the resonant frequency of the system. One voice coil is located above the region where the magnetic field lines converge in the magnetic circuit assembly, and the other is located below this region. This ensures that even when the voice coils operate at large amplitude, at least one voice coil remains within the region where the magnetic field lines converge, thereby reducing loudspeaker distortion and improving its sound performance. Compared to a single voice coil loudspeaker, the dual voice coil structure design also facilitates the adjustment of the loudspeaker's black-and-white (BL) curve. By changing the length, resistance, and magnetic field strength of the voice coil lines, the superposition of the two voice coil BL curves makes the overall BL curve of the loudspeaker flatter, further reducing distortion. Attached Figure Description

[0019] Figure 1 This is an exploded view of the speaker according to an embodiment of this application.

[0020] Figure 2 This is a cross-sectional view of the speaker according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the assembly structure of the magnetic circuit assembly and voice coil assembly of a loudspeaker according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the assembly structure of the magnetic circuit assembly and voice coil assembly of a loudspeaker according to another embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the assembly structure of the magnetic circuit assembly and voice coil assembly of a loudspeaker according to another embodiment of this application.

[0024] Figure 6 for Figure 5 A schematic diagram showing the direction of force on the voice coil and the direction of the magnetic field in one type of magnetic circuit layout for a loudspeaker.

[0025] Figure 7 for Figure 5 A schematic diagram showing the direction of force on the voice coil and the direction of the magnetic field under another magnetic circuit layout of the loudspeaker.

[0026] Figure 8 This is a schematic diagram of the combined structure of the second voice coil and the frame of the loudspeaker according to an embodiment of this application (the combined structure of the first voice coil and the frame is the same as that shown in this diagram).

[0027] Figure 9 The BL measured curve of a mainstream loudspeaker of similar size.

[0028] Figure 10 The BL design curve of the loudspeaker of the first embodiment of the present application.

[0029] Figure 11 The THD simulation curve of the two loudspeakers of Figure 9 and Figure 10 .

[0030] Figure 12 The BL design curve of the loudspeaker of the second embodiment of the present application (the horizontal coordinate represents displacement in mm, and the vertical coordinate represents magnetic induction in Wb / m).

[0031] Figure 13 The C ms curve of the loudspeaker.

[0032] Figure 14 The THD simulation curve of the two loudspeakers of Figure 9 and Figure 12 .

[0033] Figure 15 The structure diagram of the magnetic circuit assembly of the loudspeaker of an embodiment of the present application.

[0034] Figure 16 The structure diagram of the magnetic circuit assembly of the loudspeaker of another embodiment of the present application.

[0035] The horizontal coordinate of Figure 9 , Figure 10 , and Figure 12 represents displacement in mm, and the vertical coordinate represents magnetic induction in Wb / m.

[0036] The meanings of the various reference numerals in the drawings are as follows:

[0037] 1, diaphragm assembly; 11, dome; 12, diaphragm; 13, surround; 2, voice coil assembly; 21, first voice coil; 22, second voice coil; 23, skeleton; 231, air leak hole; 24, reinforcing paper; 25, lead wire; 3, spider; 4, inner magnetic circuit assembly; 41, inner pole piece; 42, inner magnet; 5, secondary outer magnetic circuit assembly; 51, secondary outer pole piece; 52, secondary outer magnet; 6, outer magnetic circuit assembly; 61, outer pole piece; 62, outer magnet; 7, magnetic shield; 8, magnetic gap; 81, first magnetic gap; 82, second magnetic gap; 9, first magnetic induction line collection and concentration area; 10, second magnetic induction line collection and concentration area. DETAILED DESCRIPTION

[0038] The technical solutions of the present application are further described in detail below in combination with the accompanying drawings and specific embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of implementations of the application. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Please refer to Figure 1 and Figure 2 The loudspeaker of the embodiment of the present application comprises a magnetic circuit assembly, a diaphragm assembly 1 and a voice coil assembly 2.

[0043] As shown in Figure 3 , the magnetic circuit assembly is formed with a magnetic gap 8.

[0044] The voice coil assembly 2 comprises two voice coils connected in series or in parallel, the two voice coils are respectively a first voice coil 21 and a second voice coil 22 located in the magnetic gap 8, the two voice coils are respectively fixedly connected with the diaphragm assembly 1 through corresponding frames 23, and one of the two voice coils is arranged above the center of the corresponding magnetic flux concentration area of the magnetic circuit assembly, that is, the whole voice coil is arranged above the center of the corresponding magnetic flux concentration area; the other is arranged below the center of the corresponding magnetic flux concentration area of the magnetic circuit assembly, that is, the whole voice coil is arranged below the center of the corresponding magnetic flux concentration area, and a certain gap is formed between the two voice coils, and each voice coil is fixedly connected with the corresponding frame 23.

[0045] Specifically, in this embodiment, the loudspeaker further includes a frame 3 and a magnetic cover 7. The diaphragm assembly 1 and the magnetic cover 7 are respectively fixed at opposite ends of the frame 3, and the diaphragm assembly 1 and the magnetic cover 7 respectively close the openings at both ends of the frame 3. The magnetic circuit assembly is located inside the frame 3 and is fixedly connected to the magnetic cover 7.

[0046] like Figure 2 and Figure 3 As shown, in some embodiments, the magnetic circuit assembly includes an inner magnetic circuit assembly 4 and an outer magnetic circuit assembly 6. The outer magnetic circuit assembly 6 surrounds the inner magnetic circuit assembly 4, and a magnetic gap 8 is formed between the inner magnetic circuit assembly 4 and the outer magnetic circuit assembly 6. The inner magnetic circuit assembly 4 includes an inner magnet 42 and an inner pole piece 41 sequentially disposed on the magnetic cover 7. The outer magnetic circuit assembly 6 includes an outer magnet 62 and an outer pole piece 61 sequentially disposed on the magnetic cover 7. The inner pole piece 41 is disposed at the end of the inner magnet 42 away from the magnetic cover 7, and the inner magnet 42 is fixedly connected to the magnetic cover 7. The outer pole piece 61 is disposed at the end of the outer magnet 62 away from the magnetic cover 7, and the outer magnet 62 is fixedly connected to the magnetic cover 7. The inner magnet 42 can be, for example, a cylindrical magnet, and the outer magnet 62 can be, for example, a ring-shaped magnet with a circular cross-section. A ring-shaped magnetic gap 8 is formed between the two magnets. Two ring-shaped voice coils (the first voice coil 21 and the second voice coil 22) are both located within this magnetic gap 8. The north and south poles of the two magnets are arranged oppositely; that is, if the N pole of one magnet is positioned close to the magnetic cover 7, then the S pole of the other magnet is positioned close to the magnetic cover 7. This creates a magnetic field line convergence area between the sidewalls of the inner pole piece 41 and the outer pole piece 61. At this time, the inner magnetic circuit assembly 4 and the outer magnetic circuit assembly 6 can be set at the same height (e.g., ...). Figure 3As shown, the top of the inner pole piece 41 (the end away from the magnetic cover 7) and the top of the outer pole piece 61 are arranged in a nearly flush state, the two voice coils are arranged in the same size specification (or different size specifications), and the distance between the two voice coils and the diaphragm assembly 1 is adjusted (for example, when the size specifications of the two voice coils are the same, the length of the skeleton 23 connected thereto is adjusted to adjust the distance) so that one of the voice coils (for example, the first voice coil 21 in the figure) is located above the magnetic induction line concentration area L, and the other voice coil (for example, the second voice coil 22 in the figure) is located below the magnetic induction line concentration area L. It is better to make the whole voice coil above the magnetic induction line concentration area L, and the whole voice coil below the magnetic induction line concentration area L. The position of the voice coil in this application refers to the initial position of the voice coil, that is, the position when the speaker is not working and the voice coil is stationary. The pole piece can concentrate and conduct magnetic induction lines in the magnetic field. In some embodiments, the height of the inner magnetic circuit assembly 4 and the outer magnetic circuit assembly 6 relative to the magnetic cover 7 can also be unequal, and the height of the voice coil assembly 2 is adjusted so that one of the two voice coils is located above the center of the magnetic induction line concentration area, and the other is located below the center of the magnetic induction line concentration area. As shown Figure 3 As shown, when the inner magnetic circuit assembly 4 and the outer magnetic circuit assembly 6 are arranged at the same height, one of the voice coils is the first voice coil 21, which is located above the center L of the magnetic induction line concentration area, and the other voice coil is the second voice coil 22, which is located below the center L of the magnetic induction line concentration area. The height of the surface of the first voice coil 21 away from the magnetic cover 7 relative to the magnetic cover 7 is defined as H5, and the height of the surface of the second voice coil 22 away from the magnetic cover 7 relative to the magnetic cover 7 is defined as H6, H5≥H6.

[0047] As shown Figure 4 And Figure 5 As shown in some embodiments, the magnetic circuit assembly can include an inner magnetic circuit assembly 4 and an outer magnetic circuit assembly 6, and a secondary outer magnetic circuit assembly 5 is arranged on the magnetic cover 7 between the inner magnetic circuit assembly 4 and the outer magnetic circuit assembly 6. The first magnetic gap 81 is formed between the secondary outer magnetic circuit assembly 5 and the inner magnetic circuit assembly 4, and the first voice coil 21 is located in the first magnetic gap 81. The second magnetic gap 82 is formed between the secondary outer magnetic circuit assembly 5 and the outer magnetic circuit assembly 6, and the second voice coil 22 is located in the second magnetic gap 82.

[0048] The secondary external magnetic circuit assembly 5 may include only the secondary external pole piece 51 or include both the secondary external pole piece 51 and the secondary external magnet 52. When the secondary external magnet 52 is included, its two ends are fixedly connected to the secondary external pole piece 51 and the magnetic cover 7, respectively. The secondary external magnet 52 may be a magnet with a ring-shaped cross-section. In this case, a first magnetic field line convergence region 9 is formed between the two side walls of the secondary external pole piece 51 and the inner pole piece 41, which corresponds to the first voice coil 21. A second magnetic field line convergence region 10 is formed between the two side walls of the secondary external pole piece 51 and the outer pole piece 61, which corresponds to the second voice coil 22. The secondary external pole piece 51 may also be integrally formed with the magnetic cover 7. The secondary external magnetic circuit assembly 5 is the preferred option, as it allows for easy adjustment of the magnetic field effect of the two voice coil regions, thereby facilitating the adjustment of the speaker's BL curve.

[0049] like Figure 5 As shown, when the secondary outer magnetic circuit assembly 5 is provided, the height of the secondary outer magnetic circuit assembly 5 relative to the magnetic cover 7 is defined as H1. Here, H1 is the distance between the surface of the secondary outer magnetic circuit away from the magnetic cover 7 (for example, the upper surface of the secondary outer pole piece 51) and the surface of the magnetic cover 7 close to the secondary outer magnetic circuit assembly 5. The height of the surface of the secondary outer pole piece 51 close to the magnetic cover 7 relative to the magnetic cover 7 is defined as h1. The height of the inner magnetic circuit assembly 4 relative to the magnetic cover 7 is defined as H2, and the height of the inner magnet 42 relative to the magnetic cover 7 is defined as h2. The height of the outer magnetic circuit assembly 6 relative to the magnetic cover 7 is defined as H3, and the height of the outer magnet 62 relative to the magnetic cover 7 is defined as h3. In order to make the effect of the secondary outer pole piece 51 in transferring and conducting magnetic field lines better, H1≥H2 and H1≥H3 can be made. Preferably, h1≤H2 and h1≤H3 can be made. More preferably, h1≤h2 and h1≤h3 can be made. The above arrangement ensures that the total height of the secondary outer magnetic circuit assembly 5 is not lower than the higher of the outer magnetic circuit assembly 6 and the inner magnetic circuit assembly 4, and not higher than the lower of the outer magnetic circuit assembly 6 and the inner magnetic circuit assembly 4, so as to better transfer and conduct the magnetic field lines of the inner pole piece 41 and the outer pole piece 61. When the secondary outer magnet 52 is provided, the secondary outer magnet 52 can also be a magnet. In this case, the magnetic poles of the inner magnet 42 can be set opposite to the magnetic poles of the secondary outer magnet 52 and the outer magnet 62. For example, the N pole of the inner magnet 42 is set closer to the magnetic cover 7, and the N poles of the secondary outer magnet 52 and the outer magnet 62 are both set away from the magnetic cover 7 (e.g., Figure 6 (As shown); Alternatively, the inner magnet 42 and the outer magnet 62 can have the same magnetic poles, but opposite to the magnetic poles of the secondary outer magnet 52. For example, the N poles of the inner magnet 42 and the outer magnet 62 can be positioned closer to the magnetic cover 7, while the N pole of the secondary outer magnet 52 can be positioned further away from the magnetic cover 7 (e.g., Figure 7 (As shown). The magnetic pole orientation of the above magnet does not affect the normal operation of the speaker. It is only necessary to adjust the current direction in each voice coil synchronously according to the magnetoacoustic direction so that the forces on the two energized voice coils in the magnetic field are simultaneously upward or simultaneously downward.

[0050] The shapes of the inner magnetic circuit assembly 4, the outer magnetic circuit assembly 6 and the secondary outer magnetic circuit assembly 5 are not limited, and in some embodiments, the inner magnet 42 can also be a rectangular cuboid magnetic steel, and the outer magnet 62 can be composed of a plurality of rectangular cross-section magnetic steels (for example, as shown in Figure 15 four rectangular cuboid magnetic steels are arranged, one for each side of the rectangular inner magnet 42), or a rectangular cross-section annular magnetic steel (as shown in Figure 16 At this time, the secondary outer magnet 52 can be arranged as a rectangular cross-section annular magnetic steel.

[0051] As shown in Figure 1 and Figure 2 The diaphragm assembly 1 of the present embodiment includes a dome 11 and a diaphragm 12, the inner edge of the diaphragm 12 is fixedly connected to the outer edge of the dome 11, and the outer edge of the diaphragm 12 is fixedly connected to the edge of one end of the basket 3. In order to achieve better sound production effect, the diaphragm 12 can also be arched outward. In some embodiments, in order to further enhance the sound production effect, a spring 13 can also be arranged, the inner edge of the spring 13 is fixed on the second voice coil 22, and the outer edge of the spring 13 is fixed on the step in the middle of the basket 3. The spring 13 and the diaphragm 12 form a double-suspension vibration system, which improves the sound production quality. The diaphragm assembly 1 of the present embodiment adopts a dome 11 type, and the flat top structure makes the overall structure of the loudspeaker more compact, which is beneficial to reducing the thickness size of the loudspeaker and developing it in the direction of lightness and thinness. The diaphragm assembly 1 is fixedly connected to the basket 3 and the voice coil by bonding, and the two voice coils jointly drive the diaphragm assembly 1 such as the dome 11 to vibrate, and the common support of the double voice coils strengthens the structural strength of the dome 11, thereby reducing the partition vibration of the vibration system.

[0052] As shown in Figure 8 The voice coil assembly 2 of the present embodiment further includes a skeleton 23, a reinforcing paper 24 arranged on the upper part of the skeleton 23 (the end of the skeleton 23 away from the magnetic cover 7), and a voice coil fixed on the lower part of the skeleton 23 (the end of the skeleton 23 close to the magnetic cover 7), the head and tail of the voice coil wire are respectively provided with a lead wire 25, and the two voice coils are connected in series or parallel through the lead wire 25 and connected with an external signal. The upper part of the skeleton 23 is also provided with a gas vent 231, which can balance the air pressure in the magnetic circuit.

[0053] When the secondary outer magnetic circuit assembly 5 is arranged, the position of the voice coil can be adjusted in the following way:

[0054] When the relative positions of the two voice coils are substantially the same height as the top of the ball 11, and since the main function of the pole pieces is to concentrate the magnetic induction lines, the magnetic induction lines in the magnetic circuit will concentrate on both sides of the pole pieces, forming a loop. At this time, the height difference between the inner and outer pole pieces 61 bonded to the inner and outer magnets 42 and 62 can be changed, or the thickness of the inner and outer pole pieces 61 can be changed directly to form a height difference between the inner and outer pole pieces 61. At the same time, the secondary outer pole pieces 51 act as a relay to conduct the magnetic induction lines, and the centers of the magnetic induction line concentration areas are formed above the main body of the first voice coil 21 (the end away from the magnetic cover 7 is considered as the top) and below the main body of the second voice coil 22, respectively (for example, as shown in FIG. 6, the center L1 of the magnetic induction line concentration area is formed above the first voice coil 21), or the centers of the magnetic induction line concentration areas are formed below the main body of the first voice coil 21 and above the main body of the second voice coil 22, respectively (for example, as shown in FIG. 7, the center L2 of the magnetic induction line concentration area is formed below the second voice coil 22). Figure 5 Figure 5

[0055] When the positions of the inner and outer magnetic circuit assemblies 6 are substantially the same height, and the sizes of the two voice coils are also the same, since the voice coils are fixed to the bottom of the skeleton 23, and the skeleton 23 is bonded to the top of the ball 11, the initial position of the voice coil in the magnetic circuit can be changed by changing the height of the skeleton 23. Under the condition of ensuring sufficient safe vibration space for the voice coil, the main body of the first voice coil 21 and the main body of the second voice coil 22 are required to be below and above the centers of the first and second magnetic induction line concentration areas, respectively, or the main body of the first voice coil 21 and the main body of the second voice coil 22 are required to be above and below the centers of the first and second magnetic induction line concentration areas, respectively. At this time, one of the relative positions of the two voice coils is the same as that in Figure 3

[0056] When the positions of the two voice coils and the inner and outer magnetic circuit assemblies 6 are not the same height, the heights of the inner and outer magnets 62 and the inner and outer pole pieces 61, and the height of the skeleton 23 can be adjusted simultaneously, so that the main bodies of the two voice coils are relatively above and below the centers of the first and second magnetic induction line concentration areas, respectively, or the main bodies of the two voice coils are relatively below and above the centers of the first and second magnetic induction line concentration areas, respectively.

[0057] The inventor found during the implementation of the present application that the low frequency distortion of the loudspeaker is mainly caused by the harmonic distortion caused by the nonlinear vibration of the loudspeaker, and the nonlinearity of the BL is the main factor of the nonlinear vibration. Adjusting the BL curve to be flat can effectively improve part of the low frequency distortion, as shown in FIG. 8, which is a BL graph actually measured for a mainstream loudspeaker similar in size to the loudspeaker of the present embodiment. The BL value changes by nearly 50% in an up-down displacement of 3mm, which will cause serious nonlinear distortion. Figure 9

[0058] As​​​​Figure 10 The diagram shown is a magnetic field nonlinearity BL curve of the loudspeaker design according to the first embodiment of this application. It displays the BL curves of the two voice coils individually, as well as the overall BL curve of the two voice coils combined, which is the BL curve of the entire vibration system. Specifically, the magnetic field strength of the region where the two voice coils are located can be adjusted by changing the thickness and grade of each magnet and the thickness of each pole piece; the wire length and resistance of the voice coils can be adjusted by changing the material and diameter of the voice coil wires; by adjusting the magnetic field strength and wire length of each voice coil to a suitable range, so that they are within the maximum amplitude range of the loudspeaker, the combined BL of the two voice coils satisfies: B L总 min / B L总max >0.5.

[0059] like Figure 11 As shown, under the condition that the size, displacement amplitude, and compliance curve of the two speakers are the same, THD (Total Harmonic Distortion) simulations were performed on a mainstream speaker of similar size and the speaker designed in the first embodiment of this application at an equal amplitude of 3mm. In the figure, because the BL curve of the first embodiment is flatter in the displacement amplitude range, the degree of undesirable nonlinear vibration of the entire vibration system is smaller. Compared with the mainstream speaker of the same size, its low-frequency THD is reduced by more than 50%.

[0060] like Figure 12 The diagram shown is a nonlinear magnetic field BL diagram for a loudspeaker design according to the second embodiment of this application. Due to C ms The (speaker compliance) curve is a downward-opening curve (e.g., Figure 13 As shown), when the vertical amplitude is within 1.8mm, the opening of the BL curve can be made to face upwards, thereby connecting BL and... Cms The nonlinearities cancel each other out, further reducing the nonlinearity of the speaker at low frequencies and lowering the harmonics generated by speaker vibration. For example... Figure 14 As shown, a THD simulation with the same amplitude of 3mm was performed on the second embodiment. Compared with a mainstream loudspeaker of the same size, the distortion was reduced by 75% under the same amplitude.

[0061] The loudspeaker designed in this way has a multi-magnetic-circuit structure, resulting in a higher magnetic field strength. By increasing the mass of the vibrating system, the loudspeaker's field of view (F0) can be reduced. Alternatively, while keeping F0 constant, the vibrating mass (M) can be increased. ms Reduce the compliance C of the vibration system ms To obtain a smaller equivalent volume V as This allows the speaker to be fitted into a smaller speaker enclosure.

[0062]

[0063] Where F0 is the resonant frequency of the loudspeaker; Mms : vibrating mass of the speaker; C ms : compliance of the speaker.

[0064]

[0065] wherein, V as : equivalent volume of the speaker; p0: air density; C: speed of sound in air; S d : effective radiating area of the speaker.

[0066] The speaker of the embodiment can be assembled in the following manner: the magnetic circuit assembly and the diaphragm assembly 1 are assembled, the two voice coils are connected in series or in parallel through the lead wires 25 and then welded to the basket 3, the diaphragm assembly 1 is bonded to the basket 3 and the voice coils, and finally the magnetic circuit assembly is fixed to the basket 3, completing the assembly.

[0067] The speaker of the embodiment of the application has two voice coils and multiple magnets, so that the BL curve of the speaker is more convenient to adjust. By adjusting the BL curve to be flat, the distortion of the speaker at low frequencies can be effectively reduced by more than 50%. Through the improvement of the structure, the structure of the speaker is more compact, and a smaller thickness can be achieved, meeting the demand of installation in a more compact space. By increasing the vibrating mass, the resonance frequency or the equivalent volume of the speaker is reduced, so that the speaker can be adapted to a smaller installation space.

[0068] The embodiment of the application also provides an electronic device comprising the speaker of the above embodiment, which can be, for example, a car audio, a small sound box or a multimedia device.

[0069] It should be noted that in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device comprising the element.

[0070] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A loudspeaker, characterized by The magnetic circuit assembly, the diaphragm assembly and the voice coil assembly are included. The magnetic circuit assembly is formed with a magnetic gap. The voice coil assembly includes two voice coils in series or in parallel, the two voice coils are respectively a first voice coil and a second voice coil located in the magnetic gap, the two voice coils are respectively fixedly connected with the diaphragm assembly through a skeleton, and one of the two voice coils is arranged above the center of the magnetic flux concentration area of the magnetic circuit assembly, and the other is arranged below the center of the magnetic flux concentration area of the magnetic circuit assembly.

2. The loudspeaker of claim 1, wherein The magnetic circuit assembly is further fixedly connected with a magnetic cover. The magnetic circuit assembly includes an inner magnetic circuit assembly and an outer magnetic circuit assembly, the outer magnetic circuit assembly surrounds the inner magnetic circuit assembly, and the magnetic gap is formed between the inner magnetic circuit assembly and the outer magnetic circuit assembly.

3. The loudspeaker of claim 2, wherein, The heights of the inner magnetic circuit assembly and the outer magnetic circuit assembly relative to the magnetic cover are equal, and the heights of the two voice coil assemblies are unequal, one of the two voice coils is above the center of the magnetic flux concentration area, and the other is below the center of the magnetic flux concentration area.

4. The loudspeaker of claim 2, wherein, The heights of the inner magnetic circuit assembly and the outer magnetic circuit assembly relative to the magnetic cover are unequal, one of the two voice coils is above the center of the magnetic flux concentration area, and the other is below the center of the magnetic flux concentration area.

5. A loudspeaker as claimed in any one of claims 2 to 4, characterised in that, The magnetic circuit assembly further includes a secondary outer magnetic circuit assembly, the secondary outer magnetic circuit assembly is arranged between the inner magnetic circuit assembly and the outer magnetic circuit assembly, the height of the secondary outer magnetic circuit assembly relative to the magnetic cover is defined as H1, the height of the inner magnetic circuit assembly relative to the magnetic cover is defined as H2, and the height of the outer magnetic circuit assembly relative to the magnetic cover is defined as H3, H1≥H2 and H1≥H3.

6. The loudspeaker of claim 5, wherein, The inner magnetic circuit assembly includes an inner magnet and an inner pole piece arranged on the magnetic cover in sequence, the outer magnetic circuit assembly includes an outer magnet and an outer pole piece arranged on the magnetic cover in sequence, and the secondary outer magnetic circuit assembly includes a secondary outer pole piece; the height of the surface of the secondary outer pole piece close to the magnetic cover relative to the magnetic cover is defined as h1; h1≤H2 and h1≤H3.

7. The loudspeaker of claim 6, wherein The height of the inner magnet relative to the magnetic cover is defined as h2, and the height of the outer magnet relative to the magnetic cover is defined as h3, h1≤h2 and h1≤h3.

8. The loudspeaker of claim 3, wherein, One of the voice coils is above the center of the magnetic flux concentration area, and the other is below the center of the magnetic flux concentration area, the first voice coil is above the center of the magnetic flux concentration area, and the second voice coil is below the center of the magnetic flux concentration area, the height of the surface of the first voice coil away from the magnetic cover relative to the magnetic cover is defined as H5, and the height of the surface of the second voice coil away from the magnetic cover relative to the magnetic cover is defined as H6, H5≥H6.

9. The loudspeaker of claim 1, wherein The diaphragm assembly includes a ball top, a diaphragm and a spring, the inner edge of the diaphragm is fixedly connected with the outer edge of the ball top, and the outer edge of the diaphragm is fixedly connected with the yoke; the inner edge of the spring is fixedly connected with the second voice coil, and the outer edge of the spring is fixedly connected with the yoke.

10. An electronic device, comprising: The loudspeaker includes the loudspeaker according to any one of claims 1 to 9.

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