Loudspeaker with double magnetic fields

Abstract

The utility model provides a double magnetic field speaker relates to electroacoustic conversion device technical field, including magnetic circuit subassembly and voice coil subassembly, magnetic circuit subassembly includes central magnetic steel, a plurality of side magnetic steel, central pole piece and side pole piece, central magnetic steel is provided with central pole piece along the height direction of speaker, and the side magnetic steel is provided with side pole piece. The central magnetic steel is divided into an upper central magnetic steel and a lower central magnetic steel; the side magnetic steel is provided with the side pole piece along the height direction of the loudspeaker so as to divide the side magnetic steel into the upper magnetic steel and the lower magnetic steel, so that the height of the magnetic steel is reduced, and the magnetic steel is simpler to process and manufacture, higher in yield and lower in cost; besides, the voice coil is arranged at the position corresponding to the central pole piece through the connecting piece and comprises a part located above the central pole piece and a part located below the central pole piece, so that the voice coil is inserted into magnetic field loops on the upper side and the lower side of the central pole piece, the mutual coupling area between the voice coil and a magnetic field is increased, the driving force of the voice coil is increased, and the reliability of the voice coil is improved. And the electro-acoustic conversion efficiency of the loudspeaker is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic conversion devices, in particular to a double magnetic field loudspeaker. Background Art

[0002] Some speakers with limited width but relatively large height, such as column speakers next to TVs, display cabinets in commercial environments, embedded speakers in decorative columns or decorative wall panels, etc., can better integrate into the environment with their relatively narrow width and provide audio playback functions while minimizing the space occupied.

[0003] However, these speakers, which are limited in width but relatively large in height, are usually equipped with some thin and tall magnets. On the one hand, the thin and tall magnets cannot fully utilize the magnetic properties of the magnets, and on the other hand, they are difficult to process and have a high cost. Utility Model Content

[0004] The utility model aims to provide a dual magnetic field loudspeaker with high magnetic performance utilization, simple processing, low cost and higher electroacoustic conversion efficiency.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] A dual magnetic field speaker, comprising:

[0007] A magnetic circuit assembly, comprising a central magnetic steel, a plurality of side magnetic steels located outside the central magnetic steel, a central pole piece, and a plurality of side pole pieces located outside the central pole piece, wherein a magnetic gap is formed between each of the side magnetic steels and the central magnetic steel; the central magnetic steel is provided with the central pole piece along the height direction of the speaker to separate the central magnetic steel into an upper central magnetic steel and a lower central magnetic steel, the side magnetic steel is provided with the side pole piece along the height direction of the speaker to separate the side magnetic steel into an upper side magnetic steel and a lower side magnetic steel, and the central pole piece is flush with the side pole piece in the height direction of the speaker;

[0008] A voice coil assembly comprises a voice coil and a connecting member arranged between the voice coil and the diaphragm, wherein the voice coil is arranged in the magnetic gap and at a position corresponding to the center pole piece, and the voice coil comprises a portion located above the center pole piece and a portion located below the center pole piece; a magnetic field loop is formed on the upper and lower sides of the center pole piece respectively, and a current is passed through the voice coil to generate a force with the magnetic field loops on the upper and lower sides of the center pole piece to drive the voice coil to move.

[0009] Furthermore, the dual magnetic field speaker also includes:

[0010] A basin frame is provided with an opening, the opening is covered with the diaphragm, and the diaphragm is connected to the voice coil through the connecting piece to vibrate back and forth following the voice coil;

[0011] A magnetic cover is arranged on a side of the basin frame away from the opening;

[0012] The lower center magnetic steel and the lower side magnetic steel are connected to the magnetic cover to form a first magnetic circuit component, and the upper center magnetic steel and the upper side magnetic steel are connected to the basin frame to form a second magnetic circuit component.

[0013] Furthermore, the magnetization directions of the upper center magnetic steel and the lower center magnetic steel are opposite, and the magnetization directions of the upper side magnetic steel and the lower side magnetic steel are opposite;

[0014] In the second magnetic circuit assembly, a magnetic pole piece is provided between the upper center magnetic steel, the upper side magnetic steel and the diaphragm, and the magnetic pole piece is embedded in the opening.

[0015] Furthermore, the connecting member is a connecting frame, and the connecting frame is arranged on a side of the diaphragm close to the magnetic pole piece;

[0016] The connection frame includes a frame and a plurality of connection arms arranged around the frame;

[0017] A plurality of through holes are arranged at positions on the magnetic conductive pole piece corresponding to the magnetic gap, and the plurality of connecting arms correspond to the plurality of through holes one by one so that the connecting arms are connected to the voice coil through the through holes.

[0018] Furthermore, the through-holes are strip-shaped holes, and a plurality of the strip-shaped holes are distributed on the magnetic conductive pole piece at intervals and are arranged to form a ring array structure;

[0019] The sum of the lengths of the plurality of strip-shaped holes is 1 / 3-1 / 2 of the circumference of the annular array structure.

[0020] Furthermore, the voice coil is a first voice coil, the connecting member is a second voice coil, the first voice coil and the second voice coil are connected via an annular bracket, and the first voice coil is connected to the diaphragm via the second voice coil and / or the annular bracket.

[0021] Furthermore, the cross section of the annular bracket is U-shaped, or the cross section of the annular bracket is hollow convex.

[0022] Further, the second voice coil is a convex voice coil, and the convex part of the convex voice coil is arranged close to the first voice coil; the cross section of the annular bracket is U-shaped, the opening of the annular bracket faces the convex part, and is fixedly connected to both sides of the convex part and its shoulder, and the end of the annular bracket away from the opening is fixedly connected to the first voice coil;

[0023] Alternatively, the cross-section of the annular bracket is hollow convex, the second voice coil is fixedly connected to the side wall of the annular bracket, the first voice coil is fixedly connected to the bottom of the annular bracket, and the diaphragm is fixedly connected to the top of the annular bracket.

[0024] Furthermore, a through hole is provided on the side wall of the annular support for the magnetic flux lines to pass through;

[0025] And / or, the material of the annular bracket is a material with low magnetic permeability.

[0026] Furthermore, the winding directions of the first voice coil and the second voice coil are opposite, and the magnetic fields of the first magnetic circuit component and the second magnetic circuit component are opposite in direction;

[0027] And / or, the magnetic pole piece and the basin frame are integrally formed;

[0028] And / or, a spherical top is provided on a side of the diaphragm away from the magnetic pole piece.

[0029] Compared with the prior art, the dual magnetic field speaker provided by the utility model has at least the following technical effects:

[0030] A center pole piece is arranged at the center magnet along the height direction of the speaker to separate the center magnet into an upper center magnet and a lower center magnet, and a side pole piece is arranged at the side magnet along the height direction of the speaker to separate the side magnet into an upper side magnet and a lower side magnet, so that the height of the magnet becomes shorter, and its processing and manufacturing is simpler, the yield is higher, and the cost is lower; in addition, the voice coil is arranged at the corresponding position of the center pole piece through a connecting piece, and includes a part located above the center pole piece and a part located below the center pole piece, so that the voice coil is inserted into the magnetic field loops on the upper and lower sides of the center pole piece, thereby increasing the mutual coupling area between the voice coil and the magnetic field, so that the driving force of the voice coil is increased without increasing the original size of the speaker, and the electroacoustic conversion efficiency of the speaker is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of a dual magnetic field speaker in one embodiment;

[0032] Figure 2 This is a schematic diagram of the main structure of a dual magnetic field speaker in one embodiment;

[0033] Figure 3 is a schematic cross-sectional structure diagram of a dual magnetic field speaker in one embodiment;

[0034] Figure 4 is a schematic diagram of an exploded structure of a dual magnetic field speaker in one embodiment;

[0035] Figure 5is a schematic cross-sectional structure diagram of a dual magnetic field speaker in another embodiment;

[0036] Figure 6 is a schematic diagram of an exploded structure of a dual magnetic field speaker in another embodiment;

[0037] Figure 7 is a schematic cross-sectional structure diagram of a dual magnetic field speaker in yet another embodiment;

[0038] Figure 8 Schematic diagram of the cross-sectional structure of a dual magnetic field speaker in yet another embodiment.

[0039] Description of Figure Numbers:

[0040] 10. Center magnet; 101. Lower center magnet; 102. Upper center magnet; 20. Side magnet; 201. Lower side magnet; 202. Upper side magnet; 301. Center pole piece; 302. Side pole piece; 40. Voice coil; 401. First voice coil; 402. Second voice coil; 4021. Convex voice coil; 403. Annular bracket; 50. Basin; 60. Diaphragm; 601. Dome; 70. Magnetic cover; 80. Magnetic conductive pole piece; 801. Perforation; 802. Middle pole piece; 803. Annular pole piece; 804. Annular channel; 90. Connecting frame; 901. Frame; 902. Connecting arm. DETAILED DESCRIPTION

[0041] The technical solution of the utility model is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the utility model. The terms used herein in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0042] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0043] The inventors of the present application discovered during the design research of speaker products that some narrow speakers are usually relatively narrow in width but relatively large in height. Such speakers are usually used in specific application scenarios with limited space or need to share space with other equipment or structures. Narrow speakers are usually equipped with some thin and tall single magnets. On the one hand, the thin and tall single magnets cannot fully utilize the magnetic properties of the magnets and cannot achieve good audio effects. On the other hand, they are not easy to process and have high costs. In addition, in order to improve the audio effect, existing narrow speakers usually increase the width of the center magnet or the width of the speaker as a whole. This fails to fully utilize the original space of the narrow speaker, resulting in low product performance and the problem of sacrificing battery space or product aesthetics. Based on this, the inventors of the present application proposed a speaker with a dual magnetic field design concept, which can effectively solve the above-mentioned problems currently existing in narrow speakers. The embodiments of the speaker with the dual magnetic field design concept are described in detail below.

[0044] Please refer to the attached Figure 1 -Attached Figure 4 An embodiment of the utility model provides a dual magnetic field speaker, including a magnetic circuit assembly and a voice coil assembly, the voice coil assembly including a voice coil 40 and a connector disposed between the voice coil 40 and a diaphragm 60, the magnetic circuit assembly including a central magnetic steel 10, a plurality of side magnetic steels 20 located outside the central magnetic steel 10, a central pole piece 301, and a plurality of side pole pieces 302 located outside the central pole piece 301. In an optional embodiment, the magnetic circuit assembly includes a central magnetic steel 10 located at the center of the speaker and four side magnetic steels 20 spaced around the central magnetic steel 10. A magnetic gap is formed between each side magnet 20 and the center magnet 10. The center magnet 10 is provided with a center pole piece 301 along the height direction of the speaker to separate the center magnet 10 into an upper center magnet 102 and a lower center magnet 101. The side magnet 20 is provided with a side pole piece 302 along the height direction of the speaker to separate the side magnet 20 into an upper side magnet 202 and a lower side magnet 201, and the center pole piece 301 and the side pole piece 302 are flush with each other in the height direction of the speaker. The voice coil 40 is provided in the magnetic gap and at a position corresponding to the center pole piece 301. The voice coil 40 includes a portion located above the center pole piece 301 and a portion located below the center pole piece 301. The upper and lower sides of the center pole piece 301 form magnetic field loops respectively. The voice coil 40 is supplied with current to generate a force with the magnetic field loops on the upper and lower sides of the center pole piece 301 to drive the voice coil 40 to move. This design improves the utilization rate of the magnetic field, and the voice coil 40 generates a stronger driving force when current is passed through it, thereby significantly improving the electro-acoustic conversion rate of the speaker. It should be further explained that the current passed through the voice coil 40 interacts with the magnetic field loops on the upper and lower sides of the center pole piece 301, thereby generating a driving force to drive the voice coil 40 to vibrate up and down. The setting of the connecting piece allows the voice coil 40 to be more fully located in the magnetic field, and the performance of the magnetic steel can be better utilized.

[0045] It should be further explained that the magnetization directions of the upper center magnetic steel 102 and the lower center magnetic steel 101 are opposite, and the magnetization directions of the upper side magnetic steel 202 and the lower side magnetic steel 201 are opposite. Specifically, the portion of the voice coil 40 located above the center pole piece 301 interacts with the magnetic field loop above the center pole piece 301, and the portion of the voice coil 40 located below the center pole piece 301 interacts with the magnetic field loop below the center pole piece 301. Since there are magnetic fields on both the upper and lower sides of the center pole piece 301, and the directions of the magnetic fields on the upper and lower sides are the same, when current is passed through the voice coil 40, the upper and lower parts of the voice coil 40 respectively interact with the corresponding magnetic fields, thereby generating driving forces in the same direction.

[0046] The present application sets a center pole piece 301 on the center magnet 10 along the height direction of the speaker to separate the center magnet 10 into an upper center magnet 102 and a lower center magnet 101, and sets a side pole piece 302 on the side magnet 20 along the height direction of the speaker to separate the side magnet 20 into an upper side magnet 202 and a lower side magnet 201, so that the height of the magnet is shortened, and its processing and manufacturing are simpler, the yield is higher, and the cost is lower; in addition, the voice coil 40 is set at the corresponding position of the center pole piece 301 through a connecting piece, and includes a part located above the center pole piece 301 and a part located below the center pole piece 301, so that the upper and lower parts of the voice coil 40 are respectively located in two adjacent magnetic field loops, thereby increasing the mutual coupling area between the voice coil 40 and the magnetic field. In this way, the driving force of the voice coil 40 is increased without increasing the original size of the speaker, and the electroacoustic conversion efficiency of the speaker is higher.

[0047] In some optional embodiments, the dual magnetic field speaker further includes a basin frame 50 and a magnetic cover 70, the basin frame 50 is provided with an opening, the opening is covered with a diaphragm 60, and the diaphragm 60 is connected to the voice coil 40 through a connector to vibrate back and forth with the voice coil 40; the magnetic cover 70 is arranged on the side of the basin frame 50 away from the opening; the center magnetic steel 10 is separated by a center pole piece to form a lower center magnetic steel 101 and an upper center magnetic steel 102, and the side magnetic steel 20 is separated by a side pole piece to form a lower side magnetic steel 201 and an upper side magnetic steel 202, the lower center magnetic steel 101 and the lower side magnetic steel 201 are connected to the magnetic cover 70 to form a first magnetic circuit component, and the upper center magnetic steel 102 and the upper side magnetic steel 202 are connected to the basin frame 50 to form a second magnetic circuit component. In a specific example, the basin frame 50 is formed by injection molding, and the basin frame 50 includes a top surface for setting the opening and a support frame arranged at the bottom of the top surface. The top surface of the basin frame 50 is in a long strip shape, and the support frame is arranged at the four corners of the bottom of the top surface. The length direction of the top surface is defined as the length direction of the speaker, the width direction of the top surface is defined as the width direction of the speaker, and the direction in which the support frame is set is defined as the height direction of the speaker. The upper center magnetic steel 102 is in the shape of a long strip and is set along the length direction of the speaker. The upper side magnetic steel 202 includes two long strip side magnetic steels and two block side magnetic steels. The length of the two long strip side magnetic steels is substantially consistent with the length of the upper center magnetic steel 102 and is set on opposite sides of the upper center magnetic steel 102 along the length direction of the speaker. The length of the two block side magnetic steels is substantially consistent with the width of the upper center magnetic steel 102 and is set on opposite sides of the upper center magnetic steel 102 along the width direction of the speaker. The lower center magnetic steel 101 and the lower side magnetic steel 201 are respectively set corresponding to the upper center magnetic steel 102 and the upper side magnetic steel 202, and the size specifications are consistent, which will not be repeated here. The magnetic cover 70 includes a magnetic cover body and protrusions arranged at opposite ends of the magnetic cover body, the lower center magnetic steel 101 is arranged in the middle of the magnetic cover body, the two long strip side magnetic steels corresponding to the lower side magnetic steel 201 are arranged on the magnetic cover body and on opposite sides of the lower center magnetic steel 101, and the two block side magnetic steels corresponding to the lower side magnetic steel 201 are arranged on the protrusions at opposite ends of the magnetic cover body. In this embodiment, the magnetic performance of the magnetic steel is effectively improved by arranging the first magnetic circuit component and the second magnetic circuit component in the height direction of the speaker, and the original space of the speaker is fully utilized while improving the utilization rate of the magnetic performance. Compared with the thin and high single magnetic steel, the utilization rate of the magnetic performance is improved by more than 30%.

[0048] In an optional embodiment, the center pole piece 301 is arranged corresponding to the center magnetic steel 10, and is located between the lower center magnetic steel 101 and the upper center magnetic steel 102, and the side pole piece 302 is arranged corresponding to the side magnetic steel 20, and is located between the lower side magnetic steel 201 and the upper side magnetic steel 202. The size of the center pole piece 301 is substantially consistent with the size of the center magnetic steel, and the size of the side pole piece 302 is substantially consistent with the size of the side magnetic steel. The center pole piece 301 and the center magnetic steel can be connected by bonding, and similarly, the side pole piece 302 and the side magnetic steel can also be connected by bonding.

[0049] In an optional embodiment, a magnetic pole piece 80 is provided between the upper center magnet 102 and the upper side magnet 202 and the diaphragm 60 in the second magnetic circuit assembly, and the magnetic pole piece 80 is embedded in the opening. On the one hand, the magnetic pole piece 80 can guide and concentrate the magnetic flux lines of the upper center magnet 102 and the upper side magnet 202, reduce magnetic leakage, and maximize the driving force on the voice coil 40. On the other hand, it can also support the upper center magnet 102 and the upper side magnet 202 to enhance the impact resistance of the speaker. The magnetic pole piece 80 can be integrally formed with the basin frame 50 by injection molding. The upper center magnet 102 and the upper side magnet 202 can be firmly connected to the magnetic pole piece 80 by bonding.

[0050] Please refer to the attached Figure 3 and attached Figure 4 In an optional embodiment, the number of voice coil 40 is one, which is arranged at a position corresponding to the center pole piece 301, and includes a first portion arranged between the lower center magnetic steel 101 and the lower side magnetic steel 201 and a second portion arranged between the upper center magnetic steel 102 and the upper side magnetic steel 202. When the audio current flows through the voice coil 40, the first portion and the second portion interact with the magnetic fields in the first magnetic circuit component and the second magnetic circuit component respectively.

[0051] In an optional embodiment, the connecting member is a connecting frame 90, and the connecting frame 90 is arranged on a side of the diaphragm 60 close to the magnetic pole piece 80; the connecting frame 90 includes a frame 901 and a plurality of connecting arms 902 arranged around the frame 901; a plurality of through holes 801 are arranged at positions corresponding to the magnetic gap on the magnetic pole piece 80, and the plurality of connecting arms 902 correspond to the plurality of through holes 801 one by one so that the connecting arms 902 are connected to the voice coil 40 through the through holes 801. Among them, through the arrangement of the through holes 801, the connecting arms 902 can pass through the through holes 801, so as to realize the function of the connecting frame 90 connecting the voice coil 40 and the diaphragm 60. The through holes 801 should be evenly distributed on the magnetic pole piece 80.

[0052] In an optional embodiment, the perforation 801 is a strip hole, and a plurality of strip holes are distributed on the magnetic pole piece 80 at intervals and are arranged to form a circular array structure; the sum of the lengths of the plurality of strip holes is 1 / 3-1 / 2 of the circumference of the circular array structure. In a specific example, the perforations 801 are respectively arranged at the four corners of the magnetic pole piece 80 and the two long sides of the magnetic pole piece 80, and at least two perforations 801 are respectively arranged on the two long sides of the magnetic pole piece 80. It should be further explained that the sum of the lengths of the perforations 801 should be set according to the needs, and should not be too many or too small. If it is too large, it will affect the magnetic conductivity and cause magnetic leakage. If it is too small, it will affect the connection performance of the connecting frame 90 and the voice coil 40, making the connection between the diaphragm 60 and the voice coil 40 not firm. Therefore, in this embodiment, it is preferred that the sum of the lengths of the plurality of perforations 801 is 1 / 3-1 / 2 of the circumference of the circular array structure.

[0053] Please refer to the attached Figure 5 and attached Figure 6 In an optional embodiment, the voice coil 40 is a first voice coil 401, and the connecting member is a second voice coil 402. The first voice coil 401 and the second voice coil 402 are connected via an annular bracket 403, and the first voice coil 401 is connected to the diaphragm 60 via the second voice coil 402 and / or the annular bracket 403. The first voice coil 401 is located at a position corresponding to the center pole piece 301, and the second voice coil 402 is located at a position corresponding to the magnetic conductive pole piece 80. The second voice coil 402 not only connects the first voice coil 401 and the diaphragm 60, but also cuts the magnetic flux lines when powered on, and jointly promotes the diaphragm 60 to vibrate with the first voice coil 401, thereby further enhancing the driving force and improving the electroacoustic conversion efficiency of the speaker. It should be further explained that the first voice coil 401 and the second voice coil 402 can be connected in series. Without changing the resistance value and power, the wall thickness of the voice coil can be thinner, thereby reducing the magnetic gap, increasing the magnetic field strength, and enhancing product performance. On the other hand, the first voice coil 401 and the second voice coil 402 can also be connected in parallel. Without changing the voltage, the power can be increased, thereby further improving product performance.

[0054] It should be further explained that the magnetic pole piece 80 includes an intermediate pole piece 802 corresponding to the central magnetic steel 10 and an annular pole piece 803 corresponding to the side magnetic steel 20, and an annular channel 804 is formed between the intermediate pole piece 802 and the annular pole piece 803; the first voice coil 401 is arranged at a position corresponding to the central pole piece 301, and the second voice coil 402 is arranged at a position corresponding to the magnetic pole piece 80 and connected to the diaphragm 60. Among them, the annular pole piece 803 can be integrally formed by injection molding with the basin frame 50, and the width of the annular channel 804 is greater than the thickness of the voice coil 40, so that the voice coil 40 can vibrate back and forth in the annular channel 804.

[0055] Please refer to the attached Figure 7 and attached Figure 8In some optional embodiments, the cross-section of the annular bracket 403 is U-shaped, or the cross-section of the annular bracket 403 is hollow convex.

[0056] In a specific example, the second voice coil 402 is a convex voice coil 4021, and the convex part of the convex voice coil 4021 is arranged close to the first voice coil 401; the cross section of the annular bracket 403 is U-shaped, the opening of the annular bracket 403 faces the convex part, and is fixedly connected to both sides of the convex part and its shoulder, and the end of the annular bracket 403 away from the opening is fixedly connected to the first voice coil 401. Specifically, the second voice coil 402 adopts a staggered arrangement design, and the number of voice coils at one end is less than the number of voice coils at the other end, forming an inverted convex shape, and the opening of the annular bracket 403 with a U-shaped cross section is sleeved on the convex part of the second voice coil 402, and the shoulder of the convex part of the second voice coil 402 is used for longitudinal positioning, and the side of the convex part of the second voice coil 402 is fixed to the inner side of the opening of the annular bracket 403 with a U-shaped cross section by bonding, and the first voice coil 401 is fixed to the bottom of the annular bracket 403 with a U-shaped cross section by bonding. It should be further explained that in this design, the outer contour of the U-shaped annular bracket 403 does not exceed the outer diameter of the voice coil, thereby avoiding the problem of the U-shaped annular bracket 403 rubbing against the magnet or pole piece when the voice coil vibrates up and down, thereby improving the reliability of the product.

[0057] In another specific example, the cross-section of the annular bracket 403 is hollow convex, the second voice coil 402 is fixedly connected to the side wall of the annular bracket 403 , the first voice coil 401 is fixedly connected to the bottom of the annular bracket 403 , and the diaphragm 60 is fixedly connected to the top of the annular bracket 403 .

[0058] In some optional embodiments, a through hole is provided on the side wall of the annular bracket 403 for the magnetic flux lines to pass through. The through hole design on the side wall of the annular bracket 403 allows the magnetic flux lines to pass through, thereby reducing the blocking and interference of the annular bracket 403 on the magnetic field. In some other optional embodiments, the material of the annular bracket 403 is a material with low magnetic permeability. Selecting a material with low magnetic permeability as the material of the annular bracket 403 reduces the shielding effect on the magnetic field, so that the magnetic field can act more on the voice coil.

[0059] In an optional example, the winding directions of the first voice coil 401 and the second voice coil 402 are opposite, and the magnetic fields of the first magnetic circuit assembly and the second magnetic circuit assembly are opposite. Specifically, the first voice coil 401 is arranged in the magnetic gap and at a position corresponding to the center pole piece 301, and the first voice coil 401 includes a portion located above the center pole piece 301 and a portion located below the center pole piece 301; the current passing through the first voice coil 401 acts on the magnetic fields in the first magnetic circuit assembly and the second magnetic circuit assembly to generate a driving force to drive the first voice coil 401 to vibrate back and forth, the back and forth movement of the first voice coil 401 drives the second voice coil 402 to move back and forth, and the back and forth movement of the second voice coil 402 drives the diaphragm 60 to move back and forth, thereby generating a sound signal. It should be further explained that the winding directions of the first voice coil 401 and the second voice coil 402 are opposite, that is, when the same audio current is passed, currents in opposite directions can be generated on the first voice coil 401 and the second voice coil 402. In addition, the magnetic fields of the first magnetic circuit assembly and the second magnetic circuit assembly are in opposite directions. Therefore, the first voice coil 401 located at the corresponding position of the center pole piece 301 and the second voice coil 402 located at the corresponding position of the magnetic pole piece 80 can move upward or downward synchronously at the moment the audio current is passed. In this way, the vibration intensity of the diaphragm 60 is greater, and a stronger sound signal is generated.

[0060] In an optional embodiment, a dome 601 is provided on one side of the diaphragm 60 away from the magnetic pole piece 80. The size of the dome 601 is substantially consistent with the size of the voice coil 40. The provision of the dome 601 can improve the strength of the diaphragm 60 and is also conducive to improving the directivity of the speaker.

[0061] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited to them. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. The protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A dual magnetic field speaker, characterized in that: include: A magnetic circuit assembly, comprising a central magnetic steel, a plurality of side magnetic steels located outside the central magnetic steel, a central pole piece, and a plurality of side pole pieces located outside the central pole piece, wherein a magnetic gap is formed between each of the side magnetic steels and the central magnetic steel; the central magnetic steel is provided with the central pole piece along the height direction of the speaker to separate the central magnetic steel into an upper central magnetic steel and a lower central magnetic steel, the side magnetic steel is provided with the side pole piece along the height direction of the speaker to separate the side magnetic steel into an upper side magnetic steel and a lower side magnetic steel, and the central pole piece is flush with the side pole piece in the height direction of the speaker; A voice coil assembly comprises a voice coil and a connecting member arranged between the voice coil and the diaphragm, wherein the voice coil is arranged in the magnetic gap and at a position corresponding to the center pole piece, and the voice coil comprises a portion located above the center pole piece and a portion located below the center pole piece; a magnetic field loop is formed on the upper and lower sides of the center pole piece respectively, and a current is passed through the voice coil to generate a force with the magnetic field loops on the upper and lower sides of the center pole piece to drive the voice coil to move.

2. The dual magnetic field speaker according to claim 1, characterized in that: Also includes: A basin frame is provided with an opening, the opening is covered with the diaphragm, and the diaphragm is connected to the voice coil through the connecting piece to vibrate back and forth following the voice coil; A magnetic cover is arranged on a side of the basin frame away from the opening; The lower center magnetic steel and the lower side magnetic steel are connected to the magnetic cover to form a first magnetic circuit component, and the upper center magnetic steel and the upper side magnetic steel are connected to the basin frame to form a second magnetic circuit component.

3. The dual magnetic field speaker according to claim 2, characterized in that: The magnetization directions of the upper center magnetic steel and the lower center magnetic steel are opposite, and the magnetization directions of the upper side magnetic steel and the lower side magnetic steel are opposite; In the second magnetic circuit assembly, a magnetic pole piece is provided between the upper center magnetic steel, the upper side magnetic steel and the diaphragm, and the magnetic pole piece is embedded in the opening.

4. The dual magnetic field speaker according to claim 3, characterized in that: The connecting member is a connecting frame, and the connecting frame is arranged on a side of the diaphragm close to the magnetic pole piece; The connection frame includes a frame and a plurality of connection arms arranged around the frame; A plurality of through holes are arranged at positions on the magnetic conductive pole piece corresponding to the magnetic gap, and the plurality of connecting arms correspond to the plurality of through holes one by one so that the connecting arms are connected to the voice coil through the through holes.

5. The dual magnetic field speaker according to claim 4, characterized in that: The through holes are strip holes, and a plurality of the strip holes are distributed on the magnetic conductive pole piece at intervals and are arranged to form a ring array structure; The sum of the lengths of the plurality of strip-shaped holes is 1 / 3-1 / 2 of the circumference of the annular array structure.

6. The dual magnetic field speaker according to claim 3, characterized in that: The voice coil is a first voice coil, the connecting member is a second voice coil, the first voice coil and the second voice coil are connected via an annular bracket, and the first voice coil is connected to the diaphragm via the second voice coil and / or the annular bracket.

7. The dual magnetic field speaker according to claim 6, characterized in that: The cross section of the annular bracket is U-shaped, or the cross section of the annular bracket is hollow convex.

8. The dual magnetic field speaker according to claim 7, characterized in that: The second voice coil is a convex voice coil, and the convex part of the convex voice coil is arranged close to the first voice coil; the cross section of the annular bracket is U-shaped, the opening of the annular bracket faces the convex part, and is fixedly connected to both sides of the convex part and its shoulder, and one end of the annular bracket away from the opening is fixedly connected to the first voice coil; Alternatively, the cross-section of the annular bracket is hollow convex, the second voice coil is fixedly connected to the side wall of the annular bracket, the first voice coil is fixedly connected to the bottom of the annular bracket, and the diaphragm is fixedly connected to the top of the annular bracket.

9. The dual magnetic field speaker according to claim 8, characterized in that: The side wall of the annular bracket is provided with a through hole for the magnetic flux lines to pass through; And / or, the material of the annular bracket is a material with low magnetic permeability.

10. The dual magnetic field speaker according to claim 6, characterized in that: The winding directions of the first voice coil and the second voice coil are opposite, and the magnetic fields of the first magnetic circuit component and the second magnetic circuit component are opposite in direction; And / or, the magnetic pole piece and the basin frame are integrally formed; And / or, a spherical top is provided on a side of the diaphragm away from the magnetic pole piece.

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