speaker

Abstract

The present invention provides a loudspeaker, which comprises: a vibration system, comprising a diaphragm and a voice coil driving the diaphragm to vibrate and generate sound; a magnetic circuit system, comprising a magnetic bowl, a central magnetic steel fixed to the magnetic bowl, and an edge magnetic steel fixed to the magnetic bowl and arranged around the central magnetic steel, the central magnetic steel and the edge magnetic steel are spaced to form a magnetic gap, and the voice coil is inserted and suspended in the magnetic gap; the central magnetic steel comprises a central magnetic steel body fixed to the magnetic bowl and a central special-shaped magnetic steel formed by the outer periphery of the central magnetic steel body protruding away from the magnetic bowl; the central magnetic steel is magnetized along the vibration direction parallel to the vibration direction of the vibration system; the edge magnetic steel comprises an edge magnetic steel body fixed to the magnetic bowl and an edge special-shaped magnetic steel protruding away from the outer periphery of the body, and the magnetization direction of the edge magnetic steel forms an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnetic steel. Compared with the related art, the speaker of the present invention has improved BL height and BL nonlinearity.

Description

Technical Field

[0001] The invention relates to an acoustic device, in particular to a loudspeaker. Background Art

[0002] With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. In order to enrich the entertainment functions of mobile devices, speakers with sound playback are also widely used in devices. In addition, due to the miniaturization of smart devices, speakers also need to develop towards miniaturization while ensuring acoustic functions.

[0003] The speaker of the related technology includes a vibration system composed of a voice coil and a magnetic circuit system arranged 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, and the soft magnets make the magnetic lines of force formed between the main magnet and the secondary magnet concentrated at the position of the voice coil.

[0004] However, the speakers of related technology will produce strong distortion at large amplitudes. The main factors causing the distortion are the nonlinearity of the electromagnetic conversion coefficient BL and the vibration stiffness with the amplitude. In addition, the voice coil speaker BL has strong nonlinearity. The existing improvement schemes are difficult to strike a balance between the size of BL and the coefficients of the first-order and second-order terms of the BL curve, resulting in great difficulties in optimization.

[0005] Therefore, it is necessary to provide a new speaker to solve the above technical problems. Summary of the invention

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

[0007] In order to solve the above technical problems, the present invention provides a speaker, comprising:

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

[0009] A magnetic circuit system, the magnetic circuit system comprising a magnetic bowl, a central magnetic steel fixed to the magnetic bowl, and an edge magnetic steel fixed to the magnetic bowl and arranged around the central magnetic steel, the central magnetic steel and the edge magnetic steel are spaced to form a magnetic gap, and the voice coil is inserted and suspended in the magnetic gap;

[0010] The central magnetic steel comprises a central magnetic steel body fixed to the magnetic bowl and a central special-shaped magnetic steel, wherein the central special-shaped magnetic steel is formed by the outer periphery of the central magnetic steel body protruding away from the magnetic bowl; the central magnetic steel is magnetized along a vibration direction parallel to the vibration system;

[0011] The edge magnet comprises an edge magnet body fixed to the magnetic bowl and an edge shaped magnet, wherein the edge shaped magnet is formed by the outer periphery of the edge magnet body protruding away from the magnetic bowl; 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 center magnet.

[0012] Preferably, the magnetic circuit system further comprises a first soft magnetic covering the side of the central magnetic steel body away from the magnetic bowl, and the side of the first soft magnetic away from the magnetic bowl is flush with the side of the central special-shaped magnetic steel away from the magnetic bowl.

[0013] Preferably, the magnetic circuit system also includes a second soft magnetic member that covers the edge magnetic steel body and is attached to the inner periphery of the edge special-shaped magnetic steel, and a side of the second soft magnetic member away from the magnetic bowl is flush with a side of the edge special-shaped magnetic steel away from the magnetic bowl.

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

[0015] Preferably, a side of the second soft magnetic member away from the voice coil is in contact with the edge-shaped magnetic steel.

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

[0017] Preferably, a magnetic bowl extension portion extending along the vibration direction is provided on the outer periphery of the magnetic bowl, and the magnetic bowl extension portion covers a portion of the side of the edge magnetic steel away from the voice coil.

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

[0019] Compared with the related art, the speaker of the present invention comprises: a vibration system, including a diaphragm and a voice coil driving the diaphragm to vibrate and produce sound; a magnetic circuit system, including a magnetic bowl, a central magnet fixed to the magnetic bowl, and an edge magnet fixed to the magnetic bowl and arranged around the central magnet; the central magnet comprises a central magnet body fixed to the magnetic bowl and a central special-shaped magnet formed by the outer periphery of the central magnet body protruding away from the magnetic bowl; the central magnet is magnetized along a vibration direction parallel to the vibration direction of the vibration system; the edge magnet comprises an edge magnet body fixed to the magnetic bowl and an edge special-shaped magnet formed by the outer periphery of the edge magnet body protruding away from the magnetic bowl; 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 magnets can increase the length of the effective magnetic lines of force, which is equivalent to increasing the thickness of the edge magnets. At the same time, the control of BL nonlinearity is achieved through the cooperation of the central special-shaped magnets and the edge special-shaped magnets. Compared with the prior art, the speaker of the present invention increases the total magnetic energy product in the speaker through the special-shaped magnets, thereby increasing the BL of the speaker and improving the BL nonlinearity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 work, among which:

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

[0022] Figure 2 For along Figure 1 Sectional view along line AA;

[0023] Figure 3 For along Figure 1 Sectional view along the midline BB;

[0024] Figure 4 A schematic diagram of a three-dimensional structure decomposition of a loudspeaker provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the magnetic flux direction of the magnetic circuit system of the speaker provided by an embodiment of the present invention;

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

[0027] Figure 7A schematic diagram of comparing BL(x) curves of the loudspeaker provided in an embodiment of the present invention.

[0028] Figure 8 A schematic diagram of a magnetic circuit system of a loudspeaker provided in Embodiment 2 of the present invention; DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] See also Figure 1-7 As shown, an embodiment of the present invention provides a speaker 100, which includes:

[0032] A vibration system 1, the vibration system 1 comprising a diaphragm (not shown) and a voice coil 11 for driving the diaphragm to vibrate and produce sound;

[0033] A magnetic circuit system 2, the magnetic circuit system 2 comprising a magnetic bowl 21, a central magnetic steel 22 fixed to the magnetic bowl 21, and an edge magnetic steel 24 fixed to the magnetic bowl 21 and arranged around the central magnetic steel 22, the central magnetic steel 22 and the edge magnetic steel 24 are spaced to form a magnetic gap, and the voice coil 11 is inserted and suspended in the magnetic gap;

[0034] The central magnetic steel 22 comprises a central magnetic steel body 221 fixed to the magnetic bowl 21 and a central special-shaped magnetic steel 222, wherein the central special-shaped magnetic steel 222 is formed by the outer periphery of the central magnetic steel body 221 protruding away from the magnetic bowl 21; the central magnetic steel 22 is magnetized along a 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 special-shaped magnet 242, wherein the edge special-shaped magnet 242 is formed by the outer periphery of the edge magnet body 241 protruding away from the magnetic bowl 21; the magnetization direction of the edge magnet 24 forms an angle greater than or equal to 90° and less than 180° with the magnetization direction of the center magnet 22.

[0036] The magnetic circuit system 2 further includes a first soft magnet 23 covering a side of the central magnetic steel 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 a side of the central special-shaped magnetic steel 222 away from the magnetic bowl 21 .

[0037] The central special-shaped magnetic steel 222 protruding from the central magnetic steel body 221 is not covered by soft magnetism. Such a design can increase the magnetic flux passing through the upper half of the voice coil 11, thereby achieving the effect of improving the symmetry of the BL curve and reducing the first-order coefficient of the BL(x) curve.

[0038] The magnetic circuit system 2 also includes a second soft magnet 25 covering the edge magnet body 241 and attached to the inner periphery of the edge special-shaped magnet 242 , and the side of the second soft magnet 25 away from the magnetic bowl 21 is flush with the side of the edge special-shaped magnet 242 away from the magnetic bowl 21 .

[0039] In the same cross section parallel to the vibration direction of the vibration system (for example Figure 2 The cross-sectional area of ​​the second soft magnetic material 25 on the outer surface of the magnetic material 21 is smaller than the cross-sectional area of ​​the edge magnetic steel 24.

[0040] Compared with the structure of covering the edge magnetic steel with a whole piece of soft magnet in the existing speaker, the volume ratio of the second soft magnet 25 in the embodiment of the present invention is reduced compared with the obliquely magnetized edge magnetic steel 24, so that the volume ratio occupied by the magnetic steel part is increased, thereby achieving the effect of increasing the BL value and reducing the quadratic coefficient of the BL(x) curve.

[0041] It can be understood that the magnetic flux properties of the central special-shaped magnetic steel 222 and the obliquely magnetized edge magnetic steel 24 in the embodiment of the present invention will not affect each other. In order to achieve the purpose of optimizing the nonlinearity of the speaker BL, the central special-shaped magnetic steel 222 and the obliquely magnetized edge magnetic steel 24 can be used at the same time, or used separately according to actual needs.

[0042] In a possible implementation, the magnetic steel and soft magnetic structure in the central magnetic steel 22 and the edge magnetic steel 24 are designed through a cutting process, and the magnetic steels are combined by bonding or integral molding, so as to achieve detailed BL and its nonlinear control.

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

[0044] The magnetization directions of different magnetic steel structures in the magnetic circuit system 2 of the embodiment of the present invention are as follows: Figure 6Specifically, the central magnetic steel 22 in the embodiment of the present invention is magnetized in a direction parallel to the vibration direction of the vibration system 1 and away from the magnetic bowl 21, and the edge magnetic steel 24 is magnetized in a direction with an angle greater than or equal to 90° and less than 180° with the magnetization direction of the central magnetic steel 22 (i.e. Figure 6 In the direction from the second soft magnet 25 to the edge vertex angle of the magnetic bowl 21), the two surfaces of the second soft magnet 25 are respectively fitted with the edge magnetic steel body 241 and the edge special-shaped magnetic steel 242, and by narrowing the soft magnet in the magnetic circuit system 2 (the second soft magnet 25), the magnetic field lines of the magnetic bowl passing under the voice coil 11 are gathered as much as possible to the soft magnet (the second soft magnet 25) close to the voice coil 11, thereby improving the utilization rate of the magnetic energy product. Figure 2 or Figure 5 In the cross-sectional direction shown, the purpose of setting the cross-sectional area of ​​the second soft magnetic material 25 to be smaller than the cross-sectional area of ​​the edge magnetic steel 24 is also to control the direction of the magnetic lines of force; during the implementation process, considering the consistency of the magnetic orientation inside the magnetic steel material, such as Figure 6 As shown, according to the different sizes of the edge magnetic steel 24, the specific angle between the magnetization direction of the edge magnetic steel 24 and the magnetization direction of the center magnetic steel is calculated by multiplying the direction of the magnetic field line by the weighted average of the path length.

[0045] Understandably, Figure 6 The magnetization direction shown is a preferred setting. Figure 6 On the basis of the magnetizing direction shown, the magnetizing directions of all magnetic steel structures in the magnetic circuit system are reversed, and the technical effect produced is the same as the technical effect described in the above embodiment.

[0046] In this embodiment, the second soft magnetic material 25 is attached to the inner periphery of the edge special-shaped magnetic steel 242 on the long side of the edge magnetic steel 24, while the inner periphery of the edge special-shaped magnetic steel 242 on the short side of the edge magnetic steel 24 is not provided with the second soft magnetic material 25 (such as Figure 2 and Figure 3 As shown). It can be understood that if the second soft magnet 25 is not provided on the edge magnetic steel 24 and a complete magnetic steel structure is used, the overall BL performance of the magnetic circuit system 2 will be better, and the embodiment of the present invention makes different designs on the long side and the short side of the edge magnetic steel 24, which is determined according to the actual use scenario of the speaker 100. In a possible implementation, the inner periphery of the edge special-shaped magnetic steel 242 on the short side of the edge magnetic steel 24 can also be attached with a second soft magnet 25, and the technical effect achieved is the same as that of the case where the second soft magnet 25 is provided on the long side.

[0047] A magnetic bowl extension portion 211 extending along the vibration direction is disposed on the outer periphery of the magnetic bowl 21 , and the magnetic bowl extension portion 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] The embodiment of the present invention compares the BL(x) curves of the magnetic circuit system 2 including the edge magnet steel 24 magnetized obliquely with the magnetic circuit system including the edge magnet steel magnetized in parallel to the vibration direction of the voice coil in the prior art. The comparison results are shown in FIG. Figure 7 As shown, it can be seen that, under the premise that the BL size is increased to a certain extent, the magnetic circuit composed of obliquely magnetized magnetic steel reduces the quadratic term coefficient of the BL(x) curve by 20%, while the linear term coefficient of the BL(x) curve remains almost unchanged, effectively reducing the nonlinearity.

[0050] Embodiment 2

[0051] Different from the shapes of the various components of the magnetic circuit system 2 in the first embodiment, Figure 8 A schematic diagram of a magnetic circuit system 2 composed of a special-shaped edge magnetic steel body 241, a special-shaped edge magnetic steel 242 and a second soft magnetic steel 25 is shown. In the first embodiment of the present invention, the magnetic steel and the soft magnetic structure in the central magnetic steel 22 and the edge magnetic steel 24 are designed by a cutting process, and the magnetic steel is combined by bonding or integral molding. Figure 8 The middle edge magnetic steel body 241 , the edge special-shaped magnetic steel 242 and the second soft magnetic steel 25 are formed into a shape with an inclined surface compared with the first embodiment based on the cutting process.

[0052] Combination Figure 5 It can be seen that Figure 8 The inclined fitting surfaces between the magnetic steels and soft magnetic bodies make the horizontal lines perpendicular to the magnetizing direction of the magnetic steel and the vibration direction closer to the magnetic lines of force, thereby achieving detailed BL and its nonlinear control.

[0053] Compared with the related art, the speaker of the present invention comprises: a vibration system, including a diaphragm and a voice coil driving the diaphragm to vibrate and produce sound; a magnetic circuit system, including a magnetic bowl, a central magnet fixed to the magnetic bowl, and an edge magnet fixed to the magnetic bowl and arranged around the central magnet; the central magnet comprises a central magnet body fixed to the magnetic bowl and a central special-shaped magnet formed by the outer periphery of the central magnet body protruding away from the magnetic bowl; the central magnet is magnetized along a vibration direction parallel to the vibration direction of the vibration system; the edge magnet comprises an edge magnet body fixed to the magnetic bowl and an edge special-shaped magnet formed by the outer periphery of the edge magnet body protruding away from the magnetic bowl; 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 magnets can increase the length of the effective magnetic lines of force, which is equivalent to increasing the thickness of the edge magnets. At the same time, the control of BL nonlinearity is achieved through the cooperation of the central special-shaped magnets and the edge special-shaped magnets. Compared with the prior art, the speaker of the present invention increases the total magnetic energy product in the speaker through the special-shaped magnets, thereby increasing the BL of the speaker and improving the BL nonlinearity.

[0054] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A speaker, comprising: A vibration system, the vibration system comprising a diaphragm and a voice coil driving the diaphragm to vibrate and produce sound; A magnetic circuit system, the magnetic circuit system comprising a magnetic bowl, a central magnetic steel fixed to the magnetic bowl, and an edge magnetic steel fixed to the magnetic bowl and arranged around the central magnetic steel, the central magnetic steel and the edge magnetic steel are spaced to form a magnetic gap, and the voice coil is inserted and suspended in the magnetic gap; characterized in that: The central magnetic steel comprises a central magnetic steel body fixed to the magnetic bowl and a central special-shaped magnetic steel, wherein the central special-shaped magnetic steel is formed by the outer periphery of the central magnetic steel body protruding away from the magnetic bowl; the central magnetic steel is magnetized along a vibration direction parallel to the vibration system; The edge magnet comprises an edge magnet body fixed to the magnetic bowl and an edge shaped magnet, wherein the edge shaped magnet is formed by the outer periphery of the edge magnet body protruding away from the magnetic bowl; 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 center magnet.

2. The loudspeaker according to claim 1, characterized in that The magnetic circuit system also includes a first soft magnetic covering the side of the central magnetic steel body away from the magnetic bowl, and the side of the first soft magnetic away from the magnetic bowl is flush with the side of the central special-shaped magnetic steel away from the magnetic bowl.

3. The loudspeaker according to claim 1, characterized in that The magnetic circuit system also includes a second soft magnetic material covering the edge magnetic steel body and attached to the inner periphery of the edge special-shaped magnetic steel. The side of the second soft magnetic material away from the magnetic bowl is flush with the side of the edge special-shaped magnetic steel away from the magnetic bowl.

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

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

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

7. The loudspeaker according to claim 1, characterized in that A magnetic bowl extension portion extending along the vibration direction is disposed on the outer periphery of the magnetic bowl, and the magnetic bowl extension portion covers a portion of the side of the edge magnetic steel 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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