Loudspeaker

Abstract

The present invention provides a loudspeaker, comprising: a vibration system, the vibration system comprising a diaphragm and a voice coil for driving the diaphragm to vibrate and produce sound; a magnetic circuit system, comprising a U-yoke, a center magnet fixed to the U-yoke, and a peripheral magnet fixed to the U-yoke and arranged around the center magnet, wherein the center magnet and the peripheral magnet are spaced apart to form a magnetic gap, and the voice coil is positioned and suspended within the magnetic gap; the center magnet comprises a center magnet body fixed to the U-yoke and a specially-shaped center magnet formed by protruding from an outer periphery of the center magnet body in a direction away from the U-yoke; the center magnet is magnetized in a vibration direction parallel to the vibration system; the peripheral magnet comprises a peripheral magnet body fixed to the U-yoke and a specially-shaped peripheral magnet formed by protruding from an outer periphery of the peripheral magnet body in a direction away from the U-yoke; and an angle between a magnetization direction of the peripheral magnet and a magnetization direction of the center magnet is greater than or equal to 90° and less than 180°. Compared with the related art, the speaker of the present invention has a high BL factor and improved BL nonlinearity.

Description

speaker Technical Field

[0001] This invention relates to an acoustic device, and more particularly to a loudspeaker. Background Technology

[0002] With the advent of the mobile internet era, the number of smart mobile devices is constantly increasing. In order to enrich the entertainment functions of mobile devices, speakers that play sound are also widely used in these devices. Furthermore, due to the miniaturization of smart devices, speakers also need to be miniaturized while maintaining their acoustic functions. Technical issues

[0003] The loudspeaker of the related technology includes a resonant system consisting of a voice coil and a magnetic circuit system disposed around the voice coil; the magnetic circuit system includes a main magnet and a secondary magnet distributed on both sides of the voice coil, and the main magnet and the secondary magnet are covered with soft magnets for magnetic conduction, which causes the magnetic lines of force formed between the main magnet and the secondary magnet to be concentrated at the position of the voice coil.

[0004] However, loudspeakers using related technologies exhibit strong distortion under large amplitudes. The main factors contributing to this distortion are the electromagnetic conversion coefficient BL and the nonlinearity of the vibration stiffness with amplitude. Furthermore, voice coil loudspeakers have strong BL nonlinearity, and existing improvement schemes struggle to balance the magnitude of BL with the coefficients of the first and second terms of the BL curve, resulting in significant optimization challenges.

[0005] Therefore, it is necessary to provide a new loudspeaker to solve the above-mentioned technical problems. Technical solutions

[0006] The technical problem to be solved by the present invention is to provide a loudspeaker that improves the nonlinearity of the magnet BL.

[0007] To solve the above-mentioned technical problems, the present invention provides a loudspeaker, comprising:

[0008] A vibration system, the vibration system comprising a diaphragm and a voice coil for driving the diaphragm to vibrate and produce sound;

[0009] A magnetic circuit system, comprising a magnetic cup, a central magnet fixed to the magnetic cup, and an edge magnet fixed to the magnetic cup and surrounding the central magnet, wherein the central magnet and the edge magnet are spaced apart to form a magnetic gap, and the voice coil is inserted and suspended within the magnetic gap;

[0010] The central magnet includes a central magnet body fixed to the magnetic bowl and a central irregular magnet. The central irregular magnet is formed by protruding from the outer periphery of the central magnet body in a direction away from the magnetic bowl. The central magnet is magnetized along the vibration direction parallel to the vibration system.

[0011] The edge magnet includes an edge magnet body fixed to the magnetic bowl and an edge irregular magnet. The edge irregular magnet is formed by protruding from the outer periphery of the edge magnet body in a direction away from the magnetic bowl. The magnetization direction of the edge magnet is at an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnet.

[0012] Preferably, the magnetic circuit system further includes a first soft magnet covering the side of the central magnet body away from the magnetic bowl, the side of the first soft magnet away from the magnetic bowl being flush with the side of the central irregular magnet away from the magnetic bowl.

[0013] Preferably, the magnetic circuit system further includes a second soft magnet covering the edge magnet body and attached to the inner periphery of the edge irregular magnet, wherein the side of the second soft magnet away from the magnetic bowl is flush with the side of the edge irregular magnet away from the magnetic bowl.

[0014] Preferably, the cross-sectional area of ​​the second soft magnet on the same cross section parallel to the vibration direction of the vibration system is smaller than the cross-sectional area of ​​the edge magnet.

[0015] Preferably, the side of the second soft magnet furthest from the voice coil is in contact with the edge-shaped magnet.

[0016] Preferably, the magnetic circuit system further includes an auxiliary magnet disposed on the side of the first soft magnet away from the magnetic bowl, and a third soft magnet covering the side of the auxiliary magnet away from the magnetic bowl, wherein the magnetization direction of the auxiliary magnet is opposite to the magnetization direction of the central magnet.

[0017] Preferably, the outer periphery of the magnetic cup is provided with a magnetic cup extension extending along the vibration direction, the magnetic cup extension covering a portion of the side of the edge magnet away from the voice coil.

[0018] Preferably, the magnetic bowl is made of a soft magnetic material. Beneficial effects

[0019] Compared with related technologies, the loudspeaker of the present invention includes: a vibration system including a diaphragm and a voice coil for driving the diaphragm to vibrate and produce sound; a magnetic circuit system including a magnetic cup, a central magnet fixed to the magnetic cup, and an edge magnet fixed to the magnetic cup and surrounding the central magnet; the central magnet includes a central magnet body fixed to the magnetic cup and a central irregular magnet protruding from the outer periphery of the central magnet body in a direction away from the magnetic cup; the central magnet is magnetized along a vibration direction parallel to the vibration system; the edge magnet includes an edge magnet body fixed to the magnetic cup and an edge irregular magnet protruding from the outer periphery of the edge magnet body in a direction away from the magnetic cup; the magnetization direction of the edge magnet forms an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnet. In the above structure, the obliquely magnetized edge magnet can increase the length of the effective magnetic field lines, which is equivalent to increasing the thickness of the edge magnet. At the same time, the cooperation of the central irregular magnet and the edge irregular magnet achieves the control of BL nonlinearity. Compared with the prior art, the loudspeaker of the present invention increases the total magnetic energy product inside the loudspeaker through the irregular magnet, thereby increasing the loudspeaker BL and improving the BL nonlinearity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 is a three-dimensional structural diagram of the loudspeaker provided in an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view along line AA in Figure 1;

[0023] Figure 3 is a cross-sectional view along line BB in Figure 1;

[0024] Figure 4 is an exploded three-dimensional structural diagram of the loudspeaker provided in an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of the magnetic flux direction of the magnetic circuit system of the loudspeaker provided in an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of the magnetization direction of the magnetic circuit system of the loudspeaker provided in an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram comparing the BL(x) curves of the loudspeaker provided in the embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of the magnetic circuit system of the loudspeaker provided in Embodiment 2 of the present invention. Embodiments of the present invention

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] Please refer to Figures 1-7. An embodiment of the present invention provides a loudspeaker 100, which includes:

[0032] Vibration system 1, the vibration system 1 includes a diaphragm (not shown) and a voice coil 11 that drives the diaphragm to vibrate and produce sound;

[0033] The magnetic circuit system 2 includes a magnetic cup 21, a central magnet 22 fixed to the magnetic cup 21, and an edge magnet 24 fixed to the magnetic cup 21 and arranged around the central magnet 22. The central magnet 22 and the edge magnet 24 are spaced to form a magnetic gap, and the voice coil 11 is inserted and suspended in the magnetic gap.

[0034] The central magnet 22 includes a central magnet body 221 fixed to the magnetic bowl 21 and a central irregular magnet 222. The central irregular magnet 222 is formed by protruding from the outer periphery of the central magnet body 221 in a direction away from the magnetic bowl 21. The central magnet 22 is magnetized along the vibration direction parallel to the vibration system 1.

[0035] The edge magnet 24 includes an edge magnet body 241 fixed to the magnetic bowl 21 and an edge irregular magnet 242. The edge irregular magnet 242 is formed by protruding from the outer periphery of the edge magnet body 241 in a direction away from the magnetic bowl 21. The magnetization direction of the edge magnet 24 is at an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnet 22.

[0036] The magnetic circuit system 2 also includes a first soft magnet 23 covering the side of the central magnet body 221 away from the magnetic bowl 21, and the side of the first soft magnet 23 away from the magnetic bowl 21 is flush with the side of the central irregular magnet 222 away from the magnetic bowl 21.

[0037] The central irregular magnet 222, which is protruding on the central magnet body 221, is not covered by soft magnet. This design can increase the magnetic flux through the upper half of the voice coil 11, thereby improving the symmetry of the BL curve and reducing the coefficient of the first term of the BL(x) curve.

[0038] The magnetic circuit system 2 further includes a second soft magnet 25 that covers the edge magnet body 241 and is attached to the inner periphery of the edge irregular magnet 242. The side of the second soft magnet 25 away from the magnetic bowl 21 is flush with the side of the edge irregular magnet 242 away from the magnetic bowl 21.

[0039] The cross-sectional area of ​​the second soft magnet 25 on the same cross section (as shown in Figure 2) parallel to the vibration direction of the vibration system is smaller than the cross-sectional area of ​​the edge magnet 24.

[0040] Compared to the existing loudspeaker structure that covers the edge magnet with a whole sheet of soft magnet, the volume ratio of the second soft magnet 25 to the obliquely magnetized edge magnet 24 in this embodiment of the invention is reduced, which increases the volume ratio of the magnet part, thereby improving the BL value and reducing the quadratic coefficient of the BL(x) curve.

[0041] It is understood that the magnetic flux properties of the central irregular magnet 222 and the obliquely magnetized edge magnet 24 in the embodiments of the present invention will not affect each other. In order to optimize the nonlinearity of the loudspeaker BL, the central irregular magnet 222 and the obliquely magnetized edge magnet 24 can be used simultaneously or applied separately according to actual needs.

[0042] In one possible implementation, the structure of the magnets and soft magnets in the central magnet 22 and the edge magnets 24 is designed by cutting process, and the magnets are combined by bonding or integral molding, which can achieve precise BL and its nonlinear control.

[0043] The magnetic circuit system 2 further includes an auxiliary magnet 26 disposed on the side of the first soft magnet 23 away from the magnetic bowl 21, and a third soft magnet 27 covering the side of the auxiliary magnet 26 away from the magnetic bowl 21. The magnetization direction of the auxiliary magnet 26 is opposite to the magnetization direction of the central magnet 22.

[0044] The magnetization directions of different magnet structures in the magnetic circuit system 2 of this invention are shown in Figure 6. Specifically, in this embodiment, the central magnet 22 is magnetized along the vibration direction parallel to the vibration system 1, moving away from the magnetic cup 21. The edge magnet 24 is magnetized at an angle greater than or equal to 90° and less than 180° to the magnetization direction of the central magnet 22 (i.e., the direction from the second soft magnet 25 to the edge corner of the magnetic cup 22 in Figure 6). The two surfaces of the second soft magnet 25 are respectively attached to the edge magnet body 241 and the edge irregular magnet 242. By narrowing the soft magnet in the magnetic circuit system 2 (the second soft magnet 25), the area below the voice coil 11 is... The magnetic field lines of the magnetic cup are concentrated as much as possible on the soft magnet (second soft magnet 25) near the voice coil 11, thereby improving the utilization rate of magnetic energy product. In the cross-sectional direction shown in Figure 2 or Figure 5, the purpose of setting the cross-sectional area of ​​the second soft magnet 25 to be smaller than the cross-sectional area of ​​the edge magnet 24 is also to control the direction of the magnetic field lines. During implementation, considering the consistency of the magnetic orientation inside the magnet material, as shown in Figure 6, the specific angle between the magnetization direction of the edge magnet 24 and the magnetization direction of the central magnet is calculated by multiplying the direction of the magnetic field lines by the path length using a weighted average.

[0045] It is understood that the magnetization direction shown in Figure 6 is a preferred setting. Based on the magnetization direction shown in Figure 6, if the magnetization direction of all the magnets in the magnetic circuit system is reversed, the resulting technical effect is the same as that described in the above embodiments.

[0046] In this embodiment, the second soft magnet 25 is attached to the inner periphery of the irregularly shaped edge magnet 242 on the long side of the edge magnet 24, while the inner periphery of the irregularly shaped edge magnet 242 on the short side of the edge magnet 24 is not provided with the second soft magnet 25 (as shown in Figures 2 and 3). It is understood that if the second soft magnet 25 is not provided on the edge magnet 24, and a complete magnet structure is used, the overall BL performance of the magnetic circuit system 2 will be better. The different designs on the long and short sides of the edge magnet 24 in this embodiment are determined based on the actual usage scenario of the speaker 100. In a possible embodiment, the second soft magnet 25 can also be attached to the inner periphery of the irregularly shaped edge magnet 242 on the short side of the edge magnet 24, achieving the same technical effect as when the second soft magnet 25 is provided on the long side.

[0047] The outer periphery of the magnetic cup 21 is provided with a magnetic cup extension 211 extending along the vibration direction, and the magnetic cup extension 211 covers a portion of the side of the edge magnet 24 away from the voice coil 11.

[0048] The magnetic bowl 21 is made of soft magnetic material.

[0049] In this embodiment of the invention, the magnetic circuit system 2 containing the obliquely magnetized edge magnet 24 is compared with the BL(x) curve of the prior art magnetic circuit system containing the edge magnetized along the direction of voice coil vibration. The comparison results are shown in Figure 7. It can be seen that, under the premise that the BL value is increased to a certain extent, the quadratic term coefficient of the BL(x) curve is reduced by 20%, while the linear term coefficient of the BL(x) curve remains almost unchanged, effectively reducing nonlinearity.

[0050] Example 2

[0051] Unlike the shapes of the components of the magnetic circuit system 2 in the first embodiment, Figure 8 shows a schematic diagram of a magnetic circuit system 2 composed of an irregularly shaped edge magnet body 241, an irregularly shaped edge magnet 242, and a second soft magnet 25. In the first embodiment of the present invention, it is explained that the structure of the magnets and soft magnets in the central magnet 22 and the edge magnets 24 is designed by cutting process, and the magnets are combined by bonding or integral molding. However, the edge magnet body 241, the irregularly shaped edge magnet 242, and the second soft magnet 25 in Figure 8 are formed by cutting process to have a beveled shape compared to the first embodiment.

[0052] As can be seen from Figure 5, the inclined contact surfaces between the various magnets and soft magnets in Figure 8 make the horizontal line perpendicular to the magnetization direction and vibration direction of the magnets more similar to the magnetic field lines, thereby achieving precise BL and its nonlinear control.

[0053] Compared with related technologies, the loudspeaker of the present invention includes: a vibration system including a diaphragm and a voice coil for driving the diaphragm to vibrate and produce sound; a magnetic circuit system including a magnetic cup, a central magnet fixed to the magnetic cup, and an edge magnet fixed to the magnetic cup and surrounding the central magnet; the central magnet includes a central magnet body fixed to the magnetic cup and a central irregular magnet protruding from the outer periphery of the central magnet body in a direction away from the magnetic cup; the central magnet is magnetized along a vibration direction parallel to the vibration system; the edge magnet includes an edge magnet body fixed to the magnetic cup and an edge irregular magnet protruding from the outer periphery of the edge magnet body in a direction away from the magnetic cup; the magnetization direction of the edge magnet forms an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnet. In the above structure, the obliquely magnetized edge magnet can increase the length of the effective magnetic field lines, which is equivalent to increasing the thickness of the edge magnet. At the same time, the cooperation of the central irregular magnet and the edge irregular magnet achieves the control of BL nonlinearity. Compared with the prior art, the loudspeaker of the present invention increases the total magnetic energy product inside the loudspeaker through the irregular magnet, thereby increasing the loudspeaker BL and improving the BL nonlinearity.

[0054] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A loudspeaker comprising: A vibration system, the vibration system comprising a diaphragm and a voice coil for driving the diaphragm to vibrate and produce sound; A magnetic circuit system comprising a magnetic cup, a central magnet fixed to the magnetic cup, and edge magnets fixed to the magnetic cup and surrounding the central magnet, wherein the central magnet and the edge magnets are spaced apart to form a magnetic gap, and the voice coil is inserted and suspended within the magnetic gap; characterized in that... The central magnet includes a central magnet body fixed to the magnetic bowl and a central irregular magnet. The central irregular magnet is formed by protruding from the outer periphery of the central magnet body in a direction away from the magnetic bowl. The central magnet is magnetized along the vibration direction parallel to the vibration system. The edge magnet includes an edge magnet body fixed to the magnetic bowl and an edge irregular magnet. The edge irregular magnet is formed by protruding from the outer periphery of the edge magnet body in a direction away from the magnetic bowl. The magnetization direction of the edge magnet is at an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnet.

2. The loudspeaker according to claim 1, characterized in that, The magnetic circuit system also includes a first soft magnet covering the side of the central magnet body away from the magnetic bowl, the side of the first soft magnet away from the magnetic bowl being flush with the side of the central irregular magnet away from the magnetic bowl.

3. The loudspeaker according to claim 1, characterized in that, The magnetic circuit system further includes a second soft magnet that covers the edge magnet body and is attached to the inner periphery of the edge irregular magnet, wherein the side of the second soft magnet away from the magnetic bowl is flush with the side of the edge irregular magnet away from the magnetic bowl.

4. The loudspeaker according to claim 3, characterized in that, The cross-sectional area of ​​the second soft magnet on the same cross section parallel to the vibration direction of the vibration system is smaller than the cross-sectional area of ​​the edge magnet.

5. The loudspeaker according to claim 3, characterized in that, The side of the second soft magnet away from the voice coil is attached to the edge-shaped magnet.

6. The loudspeaker according to claim 2, characterized in that, The magnetic circuit system further includes an auxiliary magnet disposed on the side of the first soft magnet away from the magnetic bowl, and a third soft magnet covering the side of the auxiliary magnet away from the magnetic bowl, wherein the magnetization direction of the auxiliary magnet is opposite to that of the central magnet.

7. The loudspeaker according to claim 1, characterized in that, The outer periphery of the magnetic cup is provided with a magnetic cup extension that extends along the vibration direction, and the magnetic cup extension covers a portion of the edge magnet on the side away from the voice coil.

8. The loudspeaker according to claim 1, characterized in that, The magnetic bowl is made of soft magnetic material.

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