Magnetic boost magnetic circuit system and loudspeaker

Abstract

The application provides a magnetic boosting magnetic circuit system, which comprises a magnetic circuit component, a magnetic boosting component and a yoke iron; the magnetic circuit component comprises the yoke iron and a magnetic steel arranged on a first side of the yoke iron; the magnetic boosting component is arranged on a second side of the yoke iron; the magnetic boosting component comprises a center magnetic steel and an edge magnetic steel arranged around the center magnetic steel; the magnetic pole direction of the magnetic steel is the same as that of the center magnetic steel, and the magnetic pole direction of the edge magnetic steel changes with the magnetic pole direction of the magnetic steel; the magnetic flux of the magnetic circuit system is increased, and the force factor of the loudspeaker is improved while the volume of the loudspeaker is reduced, so that the performance of the loudspeaker is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of loudspeaker technology, and particularly relates to a magnetic boost magnetic circuit system and a loudspeaker. BACKGROUND

[0002] At present, with the increasing demand of consumers on mobile phone loudspeakers, the size of the loudspeaker is getting smaller and smaller, but the requirement on amplitude is getting higher and higher. As the core driving force of loudspeaker sound generation, how to more effectively improve the voice coil force factor BL is an important product development idea.

[0003] Among them, the development trend of micro loudspeaker is smaller and smaller size, and larger and larger amplitude, which puts higher and higher requirements on the materials and structure of the loudspeaker, and needs to improve the space utilization as much as possible, but at the same time requires the heat dissipation and power consumption of the energized coil to be as low as possible to improve the endurance of the whole machine. The trade-off is closely related to the performance index and development process of the loudspeaker product. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a magnetic boost magnetic circuit system and a loudspeaker, which can reduce the size of the loudspeaker while improving the force factor of the loudspeaker, thereby improving the performance of the loudspeaker.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A magnetic boost magnetic circuit system, comprising:

[0007] A magnetic circuit assembly, comprising a yoke and a magnetic steel arranged on the first side of the yoke;

[0008] A magnetic boost assembly arranged on the second side of the yoke;

[0009] The magnetic boost assembly comprises a center magnetic steel and a side magnetic steel arranged around the center magnetic steel;

[0010] Among them, the magnetic pole direction of the magnetic steel is the same as the magnetic pole direction of the center magnetic steel, and the magnetic pole direction of the side magnetic steel changes with the magnetic pole direction of the magnetic steel.

[0011] In order to solve the above technical problems, another technical scheme adopted by the present application is:

[0012] A magnetic boost loudspeaker, comprising the magnetic boost magnetic circuit system.

[0013] The beneficial effect of the present application is that the magnetic flux of the magnetic circuit in the magnetic circuit assembly is provided by the magnetic steel, and the air forms the passage of the magnetic circuit. In the case of not changing the structure of the magnetic circuit assembly, the magnetic boosting assembly is arranged on the side of the yoke, and the magnetic pole direction of the magnetic steel is the same as that of the center magnetic steel, which increases the magnetic flux generated by the magnetic circuit assembly, thereby increasing the magnetic flux in the passage of the magnetic circuit. At the same time, the magnetic pole direction of the side magnetic steel of the magnetic boosting assembly is adapted to the magnetic pole direction of the magnetic steel, that is, along the direction of the magnetic force line of the magnetic circuit assembly, so that the magnetic flux provided by the side magnetic steel all enters the magnetic circuit. Therefore, the center magnetic steel and the side magnetic steel both increase the magnetic flux of the magnetic circuit assembly, thereby improving the force factor BL of the loudspeaker. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A structural schematic diagram of a magnetic boosting magnetic circuit system provided for an embodiment of the present application is provided.

[0015] Figure 2 An array structural schematic diagram of a magnetic boosting magnetic circuit system provided for an embodiment of the present application is provided.

[0016] Figure 3 A space coordinate system schematic diagram of a magnetic boosting magnetic circuit system provided for an embodiment of the present application is provided.

[0017] Figure 4 A force factor BL curve diagram of a magnetic boosting loudspeaker provided for an embodiment of the present application and a different boosting structure scheme in the prior art are provided.

[0018] Figure 5 A magnetic flux density cloud diagram of a loudspeaker magnetic circuit of a conventional scheme in the prior art is provided.

[0019] Figure 6 A magnetic flux density cloud diagram of a loudspeaker magnetic circuit of a single magnetic scheme in the prior art is provided.

[0020] Figure 7 A magnetic flux density cloud diagram of a loudspeaker magnetic circuit of a different shape single magnetic scheme in the prior art is provided.

[0021] Figure 8 A magnetic flux density cloud diagram of a loudspeaker magnetic circuit of a magnetic boosting loudspeaker provided for an embodiment of the present application is provided.

[0022] Label explanation:

[0023] 1, magnetic circuit assembly; 2, magnetic boosting assembly; 11, yoke; 12, magnetic steel; 21, center magnetic steel; 22, side magnetic steel; 31, inner Haisi; 32, side Haisi; 121, inner magnetic steel; 122, outer magnetic steel; 221, first side magnetic steel; 222, second side magnetic steel; 223, third side magnetic steel; 224, fourth side magnetic steel. DETAILED DESCRIPTION

[0024] In order to explain the technical content, the purposes and effects of the present application in detail, the following will be described in conjunction with the embodiments and the accompanying drawings.

[0025] Please refer to Figure 1 The magnetic boosting magnetic circuit system provided by the embodiment of the present application comprises:

[0026] The magnetic circuit assembly comprises a yoke and a magnetic steel arranged on the first side of the yoke.

[0027] The magnetic boosting assembly is arranged on the second side of the yoke.

[0028] The magnetic boosting assembly comprises a center magnetic steel and a side magnetic steel arranged around the center magnetic steel.

[0029] The magnetic pole direction of the magnetic steel is the same as that of the center magnetic steel, and the magnetic pole direction of the side magnetic steel changes with the magnetic pole direction of the magnetic steel.

[0030] From the above description, it can be seen that the present application has the following beneficial effects: the magnetic flux of the magnetic circuit assembly is provided by the magnetic steel, and the air forms the passage of the magnetic circuit. In the case of not changing the structure of the magnetic circuit assembly, the magnetic boosting assembly is arranged on one side of the yoke, and the magnetic pole directions of the magnetic steel and the center magnetic steel are the same, thereby increasing the magnetic flux generated by the magnetic circuit assembly and the magnetic flux in the passage of the magnetic circuit. At the same time, the magnetic pole direction of the side magnetic steel of the magnetic boosting assembly is adapted to the magnetic pole direction of the magnetic steel, i.e. along the direction of the magnetic force line of the magnetic circuit assembly, so that the magnetic flux provided by the side magnetic steel all enters the magnetic circuit. Therefore, the center magnetic steel and the side magnetic steel both increase the magnetic flux of the magnetic circuit assembly, thereby improving the force factor BL of the loudspeaker.

[0031] Further, the center magnetic steel and the side magnetic steel are arranged according to a Halbach array.

[0032] From the above description, it can be seen that the Halbach array is a kind of magnet structure, which aims to generate the strongest magnetic field with the least amount of magnets. By using the special arrangement of the magnet units, the field strength in one direction is enhanced. When the center magnetic steel and the side magnetic steel are arranged according to the Halbach array, the magnetic boosting assembly occupies a small volume but has a significant effect of increasing the magnetic flux.

[0033] Further, the side magnetic steel comprises a first side magnetic steel, a second side magnetic steel, a third side magnetic steel and a fourth side magnetic steel; the first side magnetic steel, the second side magnetic steel, the third side magnetic steel and the fourth side magnetic steel are arranged around the center magnetic steel respectively.

[0034] From the above description, it can be seen that in an alternative embodiment, the number of side magnetic steels is four, and they are arranged around the center magnetic steel respectively. While improving the amplitude of the BL curve of the loudspeaker, the structure of the magnetic circuit system does not need to be changed, and the occupied volume is small.

[0035] Further, the center point of the magnetic steel and the center magnetic steel are located on the same straight line.

[0036] As described above, the center point of the magnetic steel and the center magnetic steel are located on the same straight line, so that the magnetic fields generated by the two can be superimposed to the maximum extent, avoiding the shift of the magnetic flux provided by the center magnetic steel, and affecting the magnetic flux loop of the magnetic circuit assembly.

[0037] Further, the edge magnetic steel is attached to the center magnetic steel.

[0038] As described above, the closer the distance between the edge magnetic steel and the center magnetic steel, the more the magnetic field superposition area, and the more the magnetic flux provided by the magnetic loop, thereby achieving the best effect of improving the BL curve amplitude of the loudspeaker.

[0039] Further, the magnetic steel includes an inner magnetic steel and an outer magnetic steel arranged around the inner magnetic steel, and the magnetic pole direction of the outer magnetic steel is opposite to that of the inner magnetic steel; the magnetic pole direction of the inner magnetic steel is the same as that of the center magnetic steel.

[0040] As described above, in order to significantly improve the magnetic flux of the magnetic circuit assembly, the inner magnetic steel and the outer magnetic steel are arranged in the magnetic circuit assembly, the outer magnetic steel cooperates with the inner magnetic steel to provide more magnetic flux, and the magnetic pole direction of the outer magnetic steel is opposite to that of the inner magnetic steel, thereby forming a path of the magnetic loop through the air and cooperating with the voice coil to generate amplitude.

[0041] Further, the inner magnetic steel and the outer magnetic steel have a gap therebetween, and the projections of the outer magnetic steel and the inner magnetic steel are located on the edge magnetic steel.

[0042] As described above, the gap between the inner magnetic steel and the outer magnetic steel is used to place the voice coil, and the gap forms a path of the magnetic loop through the air. By arranging the edge magnetic steel below the gap, and the projections of the outer magnetic steel and the inner magnetic steel are located on the edge magnetic steel, which is equivalent to building a "magnetic flux bridge" between the inner magnetic steel and the outer magnetic steel, thereby improving the magnetic flux in the magnetic loop.

[0043] Further, the magnetic circuit assembly is attached to the magnetic boost assembly.

[0044] As described above, the magnetic boost assembly and the magnetic circuit assembly can have a certain distance, but the farther the distance, the less the magnetic flux provided by the magnetic boost assembly. When the two are attached, the distance is the shortest, and the effect of improving the BL force factor of the voice coil is the best.

[0045] Further, the thickness of the center magnetic steel and the edge magnetic steel is the same.

[0046] From the above description, the thickness of the two is the same to ensure that the magnetic flux provided by the edge magnetic steel can be collected in the center magnetic steel to the greatest extent, and the magnetic steel density of the magnetic circuit is significantly improved.

[0047] Another embodiment of the present application provides a magnetic boost loudspeaker, comprising the magnetic boost magnetic circuit system.

[0048] From the above description, the magnetic flux of the magnetic circuit in the magnetic circuit assembly is provided by the magnetic steel, and the air forms the passage of the magnetic circuit. In the case of not changing the structure of the magnetic circuit assembly, the magnetic boost assembly is arranged on one side of the yoke, and the magnetic pole direction of the magnetic steel is the same as that of the center magnetic steel. The magnetic flux generated by the magnetic circuit assembly is increased, thereby increasing the magnetic flux in the passage of the magnetic circuit. At the same time, the magnetic pole direction of the edge magnetic steel of the magnetic boost assembly is adapted to the magnetic pole direction of the magnetic steel, that is, along the direction of the magnetic force line of the magnetic circuit assembly. Therefore, the magnetic flux provided by the edge magnetic steel all enters the magnetic circuit. Therefore, the center magnetic steel and the edge magnetic steel both increase the magnetic flux of the magnetic circuit assembly, thereby improving the force factor BL of the loudspeaker.

[0049] The embodiment of the present application provides a magnetic boost magnetic circuit system and a loudspeaker, which can be applied to external components including but not limited to folding screens, smart devices (VR / AR devices, smart glasses, smart watches, etc.). The magnetic boost assembly can cooperate with the original loudspeaker structure to reduce the volume of the loudspeaker, increase the magnetic flux of the magnetic circuit system, and improve the force factor of the loudspeaker, thereby improving the performance of the loudspeaker. The following will be described through specific embodiments:

[0050] Please refer to Figures 1 to 3 The first embodiment of the present application is:

[0051] A magnetic boost magnetic circuit system, comprising: a magnetic circuit assembly 1, the magnetic circuit assembly 1 comprising a yoke 11 and a magnetic steel 12 arranged on the first side of the yoke; a magnetic boost assembly 2 arranged on the second side of the yoke 11; the magnetic boost assembly 2 comprising a center magnetic steel 21 and an edge magnetic steel 22 arranged around the center magnetic steel; wherein the magnetic pole direction of the magnetic steel 12 is the same as the magnetic pole direction of the center magnetic steel 21, and the magnetic pole direction of the edge magnetic steel 22 changes with the magnetic pole direction of the magnetic steel 12.

[0052] It should be noted that the magnetic pole direction of the edge magnetic steel 22 changes with the magnetic pole direction of the magnetic steel 12, that is, the magnetic force line direction of the edge magnetic steel 22 is the same as the magnetic force line direction of the magnetic steel 12.

[0053] In an alternative embodiment, the magnetic steel 12 comprises an inner magnetic steel 121 and an outer magnetic steel 122 arranged around the inner magnetic steel 121, and the magnetic pole direction of the outer magnetic steel 122 is opposite to that of the inner magnetic steel 121; the magnetic pole direction of the inner magnetic steel 121 is the same as that of the center magnetic steel 21.

[0054] In the embodiment, the magnetic circuit system further comprises an inner Alnico 31 arranged on the side of the inner magnetic steel 121 away from the yoke 11 and an outer Alnico 32 arranged on the side of the outer magnetic steel 122 away from the yoke 11.

[0055] In an alternative embodiment, the center magnetic steel 21 and the side magnetic steel 22 are arranged according to a Halbach array.

[0056] Specifically, the side magnetic steel 22 comprises a first side magnetic steel 221, a second side magnetic steel 222, a third side magnetic steel 223 and a fourth side magnetic steel 224; the first side magnetic steel 221, the second side magnetic steel 222, the third side magnetic steel 223 and the fourth side magnetic steel 224 are respectively arranged around the center magnetic steel 21.

[0057] Specifically, the center point of the magnetic steel 12 and the center magnetic steel 21 is located on the same straight line.

[0058] Specifically, the side magnetic steel 22 is attached to the center magnetic steel 21.

[0059] In the embodiment, with reference to Figure 2 and Figure 3 , a space rectangular coordinate system of the magnetic circuit system is established with the magnetic pole direction of the inner magnetic steel 121 as the positive direction of the z-axis and the magnetic pole direction of the outer magnetic steel 122 as the negative direction of the z-axis, and the first side magnetic steel 221 and the third side magnetic steel 223 are respectively located on the positive direction and the negative direction of the y-axis, and the second side magnetic steel 222 and the fourth side magnetic steel 224 are respectively located on the positive direction and the negative direction of the x-axis. Then the magnetic pole direction distribution of the side magnetic steel 22 is as follows: the magnetic assist component is placed on the negative direction of the z-axis of the magnetic circuit system, the magnetic pole direction of the center magnetic steel 21 of the magnetic assist component 2 is towards the positive direction of the z-axis, the magnetic pole direction of the first side magnetic steel 221 on the positive direction of the y-axis is towards the negative direction of the y-axis, the magnetic pole direction of the third side magnetic steel 223 on the negative direction of the y-axis is towards the positive direction of the y-axis, the magnetic pole direction of the second side magnetic steel 222 on the positive direction of the x-axis is towards the negative direction of the x-axis, and the magnetic pole direction of the fourth side magnetic steel 224 on the positive direction of the x-axis is towards the negative direction of the x-axis. That is, the magnetic pole direction of the center magnetic steel 21 of the magnetic assist component 2 is consistent with that of the inner magnetic steel 121, and the magnetic pole direction of the side magnetic steel 22 is all towards the center along the magnetic force line direction of the inner Alnico 31 and the outer Alnico 32, so that the magnetic force lines of the side magnetic steel 22 converge in the middle.

[0060] It should be noted that if the magnetic pole direction of the inner magnetic steel 121 is the z-axis negative direction, the magnetic pole directions of the outer magnetic steel 122, the center magnetic steel 21 and the side magnetic steel 22 are all opposite to the z-axis positive direction of the magnetic pole direction of the inner magnetic steel 121. Wherein, the voice coil of the loudspeaker adopts alternating current when energized, and the current direction is repeatedly changed, so changing the magnetic pole direction of the magnetic steel will not change the related values of the embodiment.

[0061] Wherein, the inner magnetic steel 121 and the outer magnetic steel 122 have a gap therebetween, and the projections of the outer magnetic steel 122 and the inner magnetic steel 121 are both located on the side magnetic steel 22.

[0062] In an alternative embodiment, the magnetic circuit assembly 1 is attached to the magnetic boost assembly 2. Here, the magnetic boost assembly 2 is not limited to being in close contact with the yoke 11, and the magnetic boost assembly 2 can have a certain distance from the yoke 11, but the farther the distance, the less the magnetic flux provided by the magnetic boost assembly 2.

[0063] It should be noted that in the magnetic circuit system, the size range of the magnetic boost assembly 2 is not limited, and for a specific product, the side magnetic steel 22 and the center magnetic steel 21 have a preferred size ratio, which needs to be adjusted according to the actual test results.

[0064] In an alternative embodiment, the thickness of the center magnetic steel 21 is the same as that of the side magnetic steel 22.

[0065] In this embodiment, the inner magnetic steel 121, the outer magnetic steel 122 and the magnetic boost assembly 2 are all N48H (neodymium iron boron magnetic steel).

[0066] In this embodiment, the magnetic flux in the magnetic circuit system magnetic loop is provided by the inner magnetic steel and the outer magnetic steel, which is equivalent to the voltage provided by the power supply in the circuit; the air gap between the inner magnetic steel and the outer magnetic steel forms a path for the magnetic loop, which is equivalent to a wire in the circuit. If the wire does not change, but the voltage increases, the current in the circuit will also increase. Therefore, the polarity of the center magnetic steel below the yoke is the same as that of the inner magnetic steel, which increases the magnetic flux in the magnetic loop, which is equivalent to an additional power supply in the circuit, which increases the voltage of the entire circuit, thereby increasing the current. Referring to Figure 2 , the magnetic boost assembly is composed of a side magnetic steel and a center magnetic steel, and the polarity of the side magnetic steel is gathered towards the z-axis in the xy plane, so the magnetic flux of the side magnetic steel is also gathered towards the center magnetic steel, and then propagates towards the z-axis positive direction into the magnetic loop of the loudspeaker. Therefore, the magnetic boost assembly can effectively improve the magnetic flux, thereby improving the force factor of the loudspeaker.

[0067] Referring to Figures 4 to 8 , the second embodiment of the present application is:

[0068] A magnetic boost loudspeaker comprises the magnetic boost magnetic circuit system of embodiment one.

[0069] As shown in Table 1 and Figure 4 Compared with the conventional scheme, the single magnetic scheme and the single magnetic scheme with a special shape in the prior art, the loudspeaker comprising the Halbach array magnetic boost assembly can significantly improve the BL value of the voice coil, wherein the conventional scheme is a non-magnetic steel boost structure; the single magnetic scheme is to set a center magnetic steel only below an inner magnetic steel without an edge magnetic steel; the single magnetic scheme with a special shape comprises a center magnetic steel and an edge magnetic steel, but the magnetic pole directions of the two are in one direction; based on the conventional data without the boost magnetic steel, the single magnetic boost can improve the BL curve by 4.09%, the single magnetic scheme with a special shape can improve the BL curve by 6.54%, and the magnetic boost assembly can improve the BL curve by 11.44%.

[0070] Table 1 BL curve values of loudspeakers in different schemes

[0071]

[0072]

[0073] Referring to Figures 5 to 8 The single magnetic boost provides more magnetic flux density for the magnetic circuit of the loudspeaker, and the single magnetic scheme with a special shape has a larger volume than the single magnetic scheme, and thus further provides more magnetic flux density for the magnetic circuit of the loudspeaker, but a part of the magnetic steel in the single magnetic scheme with a special shape is located below the magnetic gap and the outer magnetic steel, and the magnetic flux of the part of the magnetic steel does not completely enter the voice coil magnetic circuit, and the effective utilization rate is low. The four outer magnetic steels of the Halbach array magnetic steel are collected towards the center along the direction of the magnetic force line of the magnet, and the magnetic pole of the center magnetic steel is positive to the z axis, which is the same as the magnetic pole of the inner magnetic steel, and thus the Halbach array magnetic boost assembly can significantly improve the magnetic flux density of the magnetic circuit, thereby significantly improving the BL value of the voice coil.

[0074] In summary, the magnetic boost magnetic circuit system and the loudspeaker provided by the application are characterized in that the magnetic flux of the magnetic circuit in the magnetic circuit system is provided by the inner magnetic steel and the outer magnetic steel, the gap between the inner magnetic steel and the outer magnetic steel forms a passage of the magnetic circuit through the air and the magnet, the magnetic boost assembly is arranged on the side of the yoke without changing the original structure of the loudspeaker, the polarity of the center magnetic steel of the magnetic boost assembly is the same as that of the inner magnetic steel of the magnetic circuit assembly, the magnetic flux generated by the magnetic circuit system is increased, and thus the magnetic flux in the passage of the magnetic circuit is increased. Meanwhile, the polarity of the edge magnetic steel of the magnetic boost assembly is adapted to the direction of the magnetic pole of the magnetic steel, that is, along the direction of the magnetic force line of the magnetic circuit assembly, and thus the magnetic flux provided by the edge magnetic steel all enters the magnetic circuit. Therefore, the center magnetic steel and the edge magnetic steel can both increase the magnetic flux, thereby improving the force factor BL of the loudspeaker, and compared with other boost magnetic steel structures, the Halbach array magnetic boost assembly of the application has a more significant effect of improving the magnetic flux density.

[0075] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent transformation or direct or indirect application in related technical fields based on the content of the present application specification and drawings are also included in the patent protection scope of the present application.

Claims

1. A magnetic boost magnetic circuit system, characterized by, Comprising: a magnetic circuit assembly comprising a yoke and a magnetic steel arranged at a first side of the yoke; a magnetic boost assembly arranged at a second side of the yoke; the magnetic boost assembly comprises a center magnetic steel and a side magnetic steel arranged around the center magnetic steel; the magnetic steel comprises an inner magnetic steel and an outer magnetic steel arranged around the inner magnetic steel, and the magnetic pole direction of the outer magnetic steel is opposite to that of the inner magnetic steel; the magnetic pole direction of the inner magnetic steel is the same as that of the center magnetic steel, and the magnetic pole direction of the side magnetic steel changes with the magnetic pole direction of the magnetic steel; there is a gap between the inner magnetic steel and the outer magnetic steel, and the projections of the outer magnetic steel and the inner magnetic steel are both on the side magnetic steel.

2. A magnetic boost magnetic circuit system according to claim 1, characterized in that, the center magnetic steel and the side magnetic steel are arranged according to a Halbach array.

3. A magnetic boost magnetic circuit system according to claim 2, characterized in that the side magnetic steel comprises a first side magnetic steel, a second side magnetic steel, a third side magnetic steel and a fourth side magnetic steel; the first side magnetic steel, the second side magnetic steel, the third side magnetic steel and the fourth side magnetic steel are arranged around the center magnetic steel respectively.

4. A magnetic boost magnetic circuit system according to claim 1 or 3, characterized in that, the center of the magnetic steel and the center of the center magnetic steel are on the same straight line.

5. A magnetic boost magnetic circuit system according to claim 1 or 3, characterized in that, the side magnetic steel is in contact with the center magnetic steel.

6. A magnetic boost magnetic circuit system according to claim 1, wherein the magnetic circuit assembly is in contact with the magnetic boost assembly.

7. A magnetic boost magnetic circuit system according to claim 1, wherein the thickness of the center magnetic steel and the side magnetic steel is the same.

8. A magnetically boosted loudspeaker characterized by, a magnetic boost magnetic circuit system comprising any one of claims 1-7.

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