Magnetic circuit unit, loudspeaker and assembly method therefor

Abstract

The present disclosure relates to a magnetic circuit unit, a loudspeaker and an assembly method therefor. The loudspeaker comprises a single magnetic circuit unit arranged between a first diaphragm and a second diaphragm; the magnetic circuit unit comprises a magnetically conductive member and a plurality of magnetic steel sheets, the magnetically conductive member has a first surface facing the first diaphragm and a second surface facing the second diaphragm, a first mounting recess is formed on the first surface, and a second mounting recess is formed on the second surface; m magnetic steel sheets are arranged in the first mounting recess, the m magnetic steel sheets are assembled together to form a closed first annular magnetic steel element, and a magnetic gap for insertion of a first voice coil is formed between the first annular magnetic steel element and the inner surface of the magnetic conductive member; n magnetic steel sheets are arranged in the second mounting recess, the n magnetic steel sheets are assembled together to form a closed second annular magnetic steel element, and a magnetic gap for insertion of a second voice coil is formed between the second annular magnetic steel element and the inner surface of the magnetic conductive member, wherein m and n are positive integers greater than 1. The loudspeaker has high sensitivity, low distortion, excellent voice coil heat dissipation, and a relatively small overall height.

Description

Magnetic circuit unit, loudspeaker and its assembly method Cross-references to related applications

[0001] This application claims priority to Chinese patent application No. CN 2024118960432, filed on December 20, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure pertains to the field of loudspeakers, specifically relating to a magnetic circuit unit, a loudspeaker, and a method for assembling the same. Background Technology

[0003] The magnetic circuit unit is a crucial component of a moving-coil loudspeaker, providing driving force for the voice coil and cone vibration system. It typically includes a magnetic conductor and a magnet, and in some cases, a front panel. The magnet plays a vital role in driving the magnetic circuit unit. Currently, most traditional electrodynamic loudspeakers use axial magnetic circuits, employing a single, integrated toroidal or circular magnet—a common structural form in the industry. This design, to some extent, results in low magnetic field energy conversion efficiency and low sensitivity. Furthermore, this structure leads to uneven magnetic flux density distribution, increasing the likelihood of nonlinear distortion.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] This disclosure relates to an improved magnetic circuit unit for a loudspeaker, which improves loudspeaker sensitivity, reduces distortion, and facilitates voice coil heat dissipation. This disclosure also relates to a loudspeaker with high sensitivity, low distortion, good voice coil heat dissipation, a compact structure, and a small overall height. This disclosure further relates to a method for assembling a loudspeaker.

[0006] The first aspect of this disclosure provides a magnetic circuit unit for a loudspeaker, including a magnetic guide with a mounting groove in the magnetic guide. The magnetic circuit unit includes a plurality of magnets disposed in the mounting groove and joined together to form a closed annular magnet. A magnetic gap is formed between the annular magnet and the surface of the magnetic guide for the insertion of a voice coil of the loudspeaker.

[0007] In one embodiment, one annular magnet is formed by splicing together 3 to 10 of the magnetic steel sheets. In another embodiment, one annular magnet is formed by splicing together 4, 6, or 8 of the magnetic steel sheets.

[0008] In one embodiment, each of the magnetic steel sheets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

[0009] In one embodiment, the mounting groove includes a stepped surface, a first sidewall and a second sidewall opposite to each other, the first sidewall being located around the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

[0010] In one embodiment, the mounting groove further includes a third sidewall opposite to the second sidewall, the third sidewall being located around the second sidewall, the stepped surface connecting the first sidewall and the third sidewall, and the magnetic gap further including the space between the third sidewall and the first sidewall.

[0011] In one embodiment, the mounting groove is generally annular, the distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall, and the height of the first sidewall is greater than or equal to the height of the magnet sheet.

[0012] In one embodiment, the magnetic conductor has opposite first and second surfaces. The mounting groove includes a first mounting groove formed on the first surface and a second mounting groove formed on the second surface. The orthographic projections of the first and second mounting grooves onto the first or second surface are concentric rings and the distance between them is greater than zero. The depth of the first or second mounting groove is greater than half the distance between the first and second surfaces. The first and second mounting grooves are respectively provided with annular magnets formed by splicing multiple magnetic steel sheets. The outer diameter of one annular magnet is smaller than the inner diameter of another annular magnet. The ratio of the thickness of the magnetic steel sheet to the outer diameter of the annular magnet is 1:(4~50).

[0013] In one embodiment, the magnetic conductive element is integrally formed from an iron block, and the material of the magnetic steel sheet is a rare earth permanent magnet material; the magnetic steel sheet is bonded to the magnetic conductive element, and / or, adjacent magnetic steel sheets are bonded to each other.

[0014] A second aspect of this disclosure provides a loudspeaker including a diaphragm and a voice coil connected to the diaphragm, the loudspeaker further including a magnetic circuit unit of the loudspeaker as described above, the voice coil being movably inserted into a magnetic gap in the magnetic circuit unit.

[0015] In one embodiment, the magnetic circuit unit effectively reduces speaker distortion, resulting in more uniform magnetic flux density and higher energy conversion, which helps improve speaker sensitivity. The resulting vehicle-mounted speaker exhibits low distortion, high sensitivity, and better voice coil heat dissipation; it also reduces overall height and interior space occupancy.

[0016] A third aspect of this disclosure provides a loudspeaker comprising a bracket open at both ends, a first diaphragm disposed at a first end of the bracket, a first voice coil connected to the first diaphragm, a second diaphragm disposed at a second end of the bracket, a second voice coil connected to the second diaphragm, and a single magnetic circuit unit disposed between the first diaphragm and the second diaphragm; the single magnetic circuit unit includes a magnetic conductor and a plurality of magnets, the magnetic conductor having a first surface facing the first diaphragm and a second surface facing the second diaphragm, a first mounting groove being formed on the first surface, and a second mounting groove being formed on the second surface; m magnets are disposed in the first mounting groove, the m magnets being joined together to form a closed first annular magnet, and a magnetic gap for the first voice coil to be inserted is formed between the first annular magnet and the inner surface of the magnetic conductor; n magnets are disposed in the second mounting groove, the n magnets being joined together to form a closed second annular magnet, and a magnetic gap for the second voice coil to be inserted is formed between the second annular magnet and the inner surface of the magnetic conductor; wherein m and n are positive integers greater than 1.

[0017] In one embodiment, m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10.

[0018] In one embodiment, each of the magnetic steel sheets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

[0019] In one embodiment, the first mounting groove and / or the second mounting groove includes a stepped surface, a first sidewall and a second sidewall opposite to each other, the first sidewall being located around the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

[0020] In one embodiment, the first sidewall and the second sidewall extend from the first surface or the second surface, the first mounting groove and / or the second mounting groove further include a third sidewall opposite to the second sidewall, the third sidewall being located on the periphery of the second sidewall, the stepped surface connecting the first sidewall and the third sidewall, and the magnetic gap further includes the space between the third sidewall and the first sidewall; the distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall, and the height of the first sidewall is greater than or equal to the height of the magnetic steel sheet.

[0021] In one embodiment, the orthographic projections of the first mounting groove and the second mounting groove onto the first surface or the second surface are concentric rings and the distance between them is greater than zero. The depth of the first mounting groove or the second mounting groove is greater than half the distance between the first surface and the second surface. The outer diameter of the first annular magnet is greater than the inner diameter of the second annular magnet. The ratio of the thickness of the magnet sheet to the outer diameter of the first annular magnet or the second annular magnet is 1:(4~50).

[0022] In one embodiment, the magnetic conductive element is integrally formed from an iron block, and the material of the magnetic steel sheet is a rare earth permanent magnet material; the magnetic steel sheet is bonded to the magnetic conductive element, and / or, adjacent magnetic steel sheets are bonded to each other.

[0023] In one embodiment, the support includes a cylindrical body, with the first diaphragm and the second diaphragm respectively suspended at opposite ends of the cylindrical body. The support also includes a fixing ring disposed within the cylindrical body, with the magnetic conductor fixed to the fixing ring.

[0024] In one embodiment, the fixing ring is bent multiple times to have multiple staggered annular mounting surfaces, and the first or second surface of the magnetic conductor is fixed to the first mounting surface; the dual-diaphragm loudspeaker further includes a first spider sleeved on the first voice coil and a second spider sleeved on the second voice coil, the outer edge of the first spider is fixed to the second mounting surface, the outer edge of the second spider is fixed to the third mounting surface, the second mounting surface and the three mounting surfaces have opposite orientations, and the first mounting surface has the same orientation as the second or third mounting surface.

[0025] In one embodiment, the cylindrical body is provided with multiple through holes, the first voice coil is provided with multiple through holes, the second voice coil is provided with multiple through holes, and the fixing ring is provided with multiple through holes to connect the various cavities inside the dual-diaphragm loudspeaker with the outside.

[0026] A fourth aspect of this disclosure provides a method for assembling a loudspeaker as described above, comprising a magnetic circuit unit mounting step, the magnetic circuit unit mounting step comprising: providing the magnetic conductor having a first mounting groove and a second mounting groove; placing m magnets in the first mounting groove to bond the m magnets in the first mounting groove and splice them together to form a closed first annular magnet; and placing n magnets in the second mounting groove to bond the n magnets in the second mounting groove and splice them together to form a closed second annular magnet.

[0027] In one embodiment, the loudspeaker employs a specially designed magnetic circuit unit, which effectively reduces loudspeaker distortion, results in more uniform magnetic flux density, and higher energy conversion, thereby improving loudspeaker sensitivity. This dual-diaphragm loudspeaker features low distortion, high sensitivity, and good voice coil heat dissipation; its compact overall structure also reduces overall height, making it suitable for use as a vehicle loudspeaker and minimizing space occupation within the vehicle. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a perspective view of a vehicle speaker according to an embodiment of the present disclosure.

[0030] Figure 2 is a front view of a vehicle speaker according to an embodiment of the present disclosure.

[0031] Figure 3 is a top view of a vehicle speaker according to an embodiment of the present disclosure.

[0032] Figure 4 is an exploded view of a vehicle speaker according to an embodiment of the present disclosure.

[0033] Figure 5 is a structural diagram of a bracket according to an embodiment of the present disclosure.

[0034] Figure 6 is an exploded view of a magnetic circuit unit according to an embodiment of the present disclosure.

[0035] Figure 7 is a cross-sectional view of a magnetic circuit unit according to an embodiment of the present disclosure.

[0036] Figure 8 is a structural diagram of half of a vehicle speaker according to an embodiment of the present disclosure.

[0037] Figure 9 is a cross-sectional view of a vehicle speaker according to an embodiment of the present disclosure.

[0038] Figure 10 is a schematic diagram of the magnetic circuit unit used in a comparative vehicle loudspeaker.

[0039] Figure 11 is a distortion curve of the vehicle speaker in the embodiment and the comparative example.

[0040] Figures 12a and 12b are schematic diagrams of the magnetic field of the magnetic circuit unit in the embodiment and the magnetic circuit unit in the comparative example, respectively.

[0041] Reference numerals: 1 - Support; 11 - Cylinder; 111 - Through hole; 12 - Fixing ring; 21 - First diaphragm; 22 - Second diaphragm; 31 - First voice coil; 32 - Second voice coil; 41 - First spider; 42 - Second spider; 5 - Magnetic circuit unit; 51 - Magnetic conductor; 51a - First surface; 51b - Second surface; 510 - Magnetic gap; 511 - First mounting groove; 512 - Second mounting groove; 513 - Stepped surface; 514 - First sidewall; 515 - Second sidewall; 516 - Third sidewall; 520 - Magnet; 521 - First annular magnet; 522 - Second annular magnet; 6 - Dust cap. Detailed Implementation

[0042] The preferred embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this disclosure can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding of this disclosure, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this disclosure described below can be combined with each other as long as they do not conflict with each other.

[0043] In this article, the directional terms "up," "down," and "horizontal" are used to help those skilled in the art understand the structure of the loudspeaker and its magnetic circuit unit, and are not intended to limit the state of the loudspeaker and its magnetic circuit unit after installation in the usage scenario. For example, the loudspeaker can be installed on a horizontal, inclined, or vertical surface of a vehicle.

[0044] The diagrams in Figures 1 to 9 are drawn to scale. To maintain the brevity of the instruction manual, the proportions of each component are not listed individually. However, the proportions and positions of each component should be considered part of the content of this instruction manual. Example

[0045] Figures 1 to 9 illustrate a loudspeaker according to this embodiment, particularly a vehicle loudspeaker, such as a car door panel loudspeaker, which is installed on the car door panel and radiates low-frequency sound into the car.

[0046] Referring to Figures 1 to 9, the loudspeaker is specifically a dual-diaphragm loudspeaker, which includes a bracket 1 open at both ends, a first diaphragm 21 disposed on the first end of the bracket 1, a first voice coil 31 connected to the first diaphragm 21, a second diaphragm 22 disposed on the second end of the bracket 1, a second voice coil 32 connected to the second diaphragm 22, a first spring 41 fitted onto the first voice coil 31, and a second spring 42 fitted onto the second voice coil 32. The dual-diaphragm loudspeaker also includes a single magnetic circuit unit 5, which is disposed between the first diaphragm 21 and the second diaphragm 22.

[0047] Figures 6 and 7 illustrate an embodiment of a magnetic circuit unit 5. Referring to Figures 6 and 7, the magnetic circuit unit 5 includes a magnetic guide 51 and a plurality of magnetic steel sheets 520. The magnetic guide 51 has a mounting groove. The magnetic circuit unit 5 includes a plurality of magnetic steel sheets 520, which are disposed in the mounting groove and joined together to form a closed annular magnet. A magnetic gap 510 is formed between the annular magnet and the surface of the magnetic guide 51 for the insertion of a speaker's voice coil. An annular magnet can be formed by joining 3 to 10 magnetic steel sheets 520. Further, an annular magnet can be formed by joining 4, 6, or 8 magnetic steel sheets 520. Different annular magnets may use the same or different magnetic steel sheets 520.

[0048] In the specific examples shown in Figures 6 and 7, the magnetic conductor 51 has a first surface 51a, on which a first mounting groove 511 is formed. The first mounting groove 511 contains m magnetic steel pieces 520, which are joined together to form a closed first annular magnet 521. A magnetic gap 510 for inserting a voice coil is formed between the first annular magnet 521 and the inner surface of the magnetic conductor 51. Further, the magnetic conductor 51 has a second surface 51b opposite to the first surface 51a, on which a second mounting groove 512 is formed. The second mounting groove 512 contains n magnetic steel pieces 520, which are joined together to form a closed second annular magnet 522. A magnetic gap 510 for inserting another voice coil is formed between the second annular magnet 522 and the inner surface of the magnetic conductor 51. m and n are positive integers greater than 1. m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10. Specifically, in this embodiment, m=4 and n=6. In this embodiment, the magnetic sheet 520 constituting the first annular magnet 521 and the magnetic sheet 520 constituting the second annular magnet 522 have different shapes and sizes. If the first annular magnet 521 and the second annular magnet 522 have the same shape and size, then they can use magnetic sheets 520 of the same specification.

[0049] Each magnet sheet 520 includes an opposite top surface and a bottom surface, and multiple side surfaces located between the top and bottom surfaces. At least one side surface is fixedly connected to the magnetic conductor 51. The top surface and / or the bottom surface is fan-shaped. Specifically, in this embodiment, the overall shape of the magnet sheet 520 is similar to a tile, wherein two side surfaces are arc surfaces, and the top and bottom surfaces are parallel planes with identical shapes and sizes, forming fan-shaped rings with equal areas.

[0050] The first mounting groove 511 includes a stepped surface 513, a first sidewall 514 and a second sidewall 515, the first sidewall 514 is located on the periphery of the second sidewall 515, the stepped surface 513 extends laterally from the first sidewall 514 toward the second sidewall 515, one side of the magnet 520 is fixedly connected to the first sidewall 514, the bottom surface of the magnet 520 is fixedly connected to the stepped surface 513, and the magnetic gap 510 includes the space between the magnet 520 and the second sidewall 515.

[0051] Similar to the first mounting groove 511, the second mounting groove 512 also includes a stepped surface 513, a first sidewall 514 and a second sidewall 515, the first sidewall 514 being located around the second sidewall 515, the stepped surface 513 extending laterally from the first sidewall 514 toward the second sidewall 515, one side of the magnet 520 being fixedly connected to the first sidewall 514, the bottom surface of the magnet 520 being fixedly connected to the stepped surface 513, and the magnetic gap 510 including the space between the magnet 520 and the second sidewall 515.

[0052] The first sidewall 514 and the second sidewall 515 of the first mounting groove 511 extend downward from the first surface 51a. The first mounting groove 511 also includes a third sidewall 516 opposite to the second sidewall 515, the third sidewall 516 being located around the second sidewall 515 and below the first sidewall 514. A stepped surface 513 connects the first sidewall 514 and the third sidewall 516, and there is a gap between the stepped surface 513 and the second sidewall 515. The magnetic gap 510 also includes the gap between the third sidewall 516 and the first sidewall 514, the distance between the first sidewall 514 and the second sidewall 515 is greater than the distance between the third sidewall 516 and the second sidewall 515, and the height of the first sidewall 514 is greater than or equal to the height of the magnetic sheet 520, so that the magnetic sheet 520 of the first annular magnet 521 does not protrude from the upper surface of the magnetic conductor 51, that is, the magnetic sheet 520 of the first annular magnet 521 is entirely embedded in the magnetic conductor 51.

[0053] The first sidewall 514 and the second sidewall 515 of the second mounting groove 512 extend upward from the second surface 51b. The second mounting groove 512 also includes a third sidewall 516 opposite to the second sidewall 515, the third sidewall 516 being located around the second sidewall 515 and above the first sidewall 514. A stepped surface 513 connects the first sidewall 514 and the third sidewall 516, and there is a gap between the stepped surface 513 and the second sidewall 515. The magnetic gap 510 also includes the gap between the third sidewall 516 and the first sidewall 514, the distance between the first sidewall 514 and the second sidewall 515 is greater than the distance between the third sidewall 516 and the second sidewall 515, and the height of the first sidewall 514 is greater than or equal to the height of the magnetic sheet 520, so that the magnetic sheet 520 of the second annular magnet 522 does not protrude from the lower surface of the magnetic conductor 51, that is, the magnetic sheet 520 of the second annular magnet 522 is entirely embedded in the magnetic conductor 51.

[0054] The first mounting groove 511 and the second mounting groove 512 are concentric rings projected onto the first surface 51a or the second surface 51b, and the distance between them is greater than zero. Further, the first mounting groove 511 and the second mounting groove 512 are both annular projected onto the first surface 51a or the second surface 51b. The outer diameter of the first annular magnet 521 is larger than the inner diameter of the second annular magnet 522. The depth of the first mounting groove 511 or the second mounting groove 512 is greater than half the distance between the first surface 51a and the second surface 51b, and portions of the first mounting groove 511 and the second mounting groove 512 overlap in the height / depth direction. The ratio of the thickness of the magnet sheet 520 to the outer diameter of the first annular magnet 521 or the second annular magnet 522 is 1:(4~50), preferably 1:(10~30).

[0055] The magnetic conductor 51 is integrally formed from a block of iron, for example, by punching a mounting groove into a single block of iron. The magnetic sheet 520 is made of rare-earth permanent magnet material. The magnetic sheet 520 is bonded to the magnetic conductor 51 with adhesive, and furthermore, adjacent magnetic sheets 520 are also bonded to each other with adhesive. There is a very small gap between adjacent magnetic sheets 520, the width of which is much smaller than the outer diameter of the toroidal magnet, for example, less than 1 / 100 of the outer diameter of the toroidal magnet.

[0056] Referring to Figures 6 and 7, the first surface 51a of the magnetic conductor 51 faces the first diaphragm 21, and the second surface 51b faces the second diaphragm 22. A magnetic gap 510 is formed between the first annular magnet 521 and the inner surface of the magnetic conductor 51 for the insertion of the first voice coil 31; a magnetic gap 510 is formed between the second annular magnet 522 and the inner surface of the magnetic conductor 51 for the insertion of the second voice coil 32.

[0057] The bracket 1 can be a one-piece component injection molded from plastic. The bracket 1 includes a cylindrical body 11, with a first diaphragm 21 and a second diaphragm 22 respectively suspended at opposite ends of the cylindrical body 11. The speaker is mounted and fixed to the vehicle via the cylindrical body 11, which may have mounting holes or other mounting structures. The cylindrical body 11 also has a wiring port, which includes a solder tab. The leads of the first voice coil 31 and the second voice coil 32 are connected to this solder tab to facilitate connection to a power amplifier and other components for receiving audio electrical signals.

[0058] The bracket 1 also includes a fixing ring 12 disposed within the cylinder 11, and a magnetic conductive element 51 is fixed to the fixing ring 12. The fixing ring 12 is bent multiple times to have multiple staggered annular mounting surfaces. The first surface 51a or the second surface 51b of the magnetic conductive element 51 is fixed to the first mounting surface. The outer edge of the first spring 41 is fixed to the second mounting surface, and the outer edge of the second spring 42 is fixed to the third mounting surface. The second mounting surface and the three mounting surfaces have opposite orientations, while the first mounting surface has the same orientation as the second or third mounting surface. For example, specifically in the examples of Figures 7 and 8, the first and second mounting surfaces face the first diaphragm 21, i.e., upwards; the third mounting surface faces the second diaphragm 22, i.e., downwards.

[0059] The cylinder 11 has multiple through holes 111, the first voice coil 31 has multiple through holes, the second voice coil 32 has multiple through holes, and the fixing ring 12 has multiple through holes to connect the various cavities inside the dual-diaphragm loudspeaker with the outside world, so as to facilitate heat dissipation.

[0060] The loudspeaker also includes a dust cap 6. The upper end of the first voice coil 31 is sealed by a dust cap 6, which is connected to the first diaphragm 21. The lower end of the second voice coil 32 is sealed by another dust cap 6, which is connected to the second diaphragm 22.

[0061] It should also be noted that the first diaphragm 21 has a truncated cone shape, and the second diaphragm 22 also has a truncated cone shape. The internal components of the loudspeaker are all housed inside the housing 11 and do not protrude outside the housing 11, thus being well protected by the housing 11.

[0062] The assembly method of the above-mentioned dual-diaphragm loudspeaker includes the installation step of the magnetic circuit unit 5. The specific installation steps of the magnetic circuit unit 5 include:

[0063] A magnetic guide 51 having a first mounting groove 511 and a second mounting groove 512 is provided;

[0064] m magnetic steel pieces 520 are placed in the first mounting groove 511 to bond the m magnetic steel pieces 520 in the first mounting groove 511 and splice them together to form a closed first annular magnet 521.

[0065] n magnetic steel pieces 521 are placed in the second mounting groove 512 to bond the n magnetic steel pieces 520 to the second mounting groove 512 and splice them together to form a closed second annular magnet 522. Comparative Example

[0066] A comparative example provides a dual-diaphragm loudspeaker similar to the embodiment, the only difference being the use of a different magnetic circuit unit; otherwise, it is essentially the same as the embodiment. Specifically, as shown in Figure 10, the first annular magnet 521' and the second annular magnet 522' of the magnetic circuit unit 5' are an integral structure, and both are directly inserted into the magnetic conductor 51'. Performance testing

[0067] The distortion curves of the dual-diaphragm loudspeakers in the embodiment and the comparative example are shown in Figure 11. It can be seen that the loudspeaker in the embodiment has lower distortion than the loudspeaker in the comparative example. The reasons are analyzed as follows:

[0068] Figure 12a shows the magnetic field distribution of the magnetic circuit unit 5 used in the embodiment, and Figure 12b shows the magnetic field distribution of the magnetic circuit unit 5' used in the comparative example. A comparison reveals that the directions of the magnetic field lines and the magnetic field distributions are significantly different. The energy conversion of the magnetic circuit unit 5' in the comparative example is insufficient, or even low, which may result in lower speaker sensitivity; the magnetic flux density distribution is uneven, leading to nonlinear distortion. The design of the magnetic circuit unit 5 in the embodiment effectively improves sensitivity and reduces distortion, while also effectively solving the voice coil heat dissipation problem.

[0069] The magnetic circuit unit 5 in this embodiment solves the problems of low energy conversion efficiency, low sensitivity, and uneven magnetic flux density distribution, significantly improving sensitivity and reducing distortion, while also effectively addressing voice coil heat dissipation. The dual magnetic circuit structure design utilizes the gap structure of the magnetic circuit, making rational use of the internal structure and effectively reducing the height of the entire magnetic circuit unit 5 and the speaker. The magnetic circuit unit 5 in this embodiment effectively reduces speaker distortion, provides more uniform magnetic flux density, and achieves higher energy conversion, thus improving speaker sensitivity. The speaker in this embodiment exhibits low distortion, high sensitivity, and good voice coil heat dissipation; it also reduces overall height, making it suitable for use as a vehicle speaker and minimizing space occupation within the vehicle.

[0070] Features of the embodiments of this disclosure are set forth in the following terms:

[0071] Clause 1. A magnetic circuit unit for a loudspeaker, comprising a magnetic guide, wherein the magnetic guide has a mounting groove, the magnetic circuit unit comprising a plurality of magnets, the plurality of magnets being disposed in the mounting groove and joined together to form a closed annular magnet, wherein a magnetic gap is formed between the annular magnet and the surface of the magnetic guide for the insertion of a voice coil of the loudspeaker.

[0072] Clause 2. In the magnetic circuit unit of the loudspeaker according to Clause 1, one of the ring magnets is formed by splicing together 3 to 10 of the magnet sheets.

[0073] Clause 3. In the magnetic circuit unit of the loudspeaker as described in Clause 2, one of the ring magnets is formed by splicing together four, six or eight of the magnet sheets.

[0074] Clause 4. The magnetic circuit unit of the loudspeaker according to any one of Clauses 1 to 3, each of the magnets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

[0075] Clause 5. The magnetic circuit unit of the loudspeaker according to Clause 4, wherein the mounting groove includes a stepped surface, opposing first and second sidewalls, the first sidewall being located on the periphery of the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

[0076] Clause 6. The magnetic circuit unit of the loudspeaker according to Clause 5, wherein the mounting groove further includes a third sidewall opposite to the second sidewall, the third sidewall being located on the periphery of the second sidewall, the stepped surface connecting the first sidewall and the third sidewall, and the magnetic gap further includes the space between the third sidewall and the first sidewall.

[0077] Clause 7. The magnetic circuit unit of the loudspeaker according to Clause 6, wherein the mounting groove is generally annular, the distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall, and the height of the first sidewall is greater than or equal to the height of the magnet sheet.

[0078] Clause 8. The magnetic circuit unit of the loudspeaker according to Clause 1, wherein the magnetic conductor has opposite first and second surfaces, the mounting groove includes a first mounting groove formed on the first surface and a second mounting groove formed on the second surface, the orthographic projection of the first mounting groove and the second mounting groove on the first surface or the second surface is concentric rings and the distance between them is greater than zero, the depth of the first mounting groove or the second mounting groove is greater than half the distance between the first surface and the second surface; the first mounting groove and the second mounting groove are respectively provided with annular magnets formed by splicing multiple magnetic steel sheets, wherein the outer diameter of one annular magnet is smaller than the inner diameter of another annular magnet, and the ratio of the thickness of the magnetic steel sheet to the outer diameter of the annular magnet is 1:(4~50).

[0079] Clause 9. The magnetic circuit unit of the loudspeaker according to Clause 1, wherein the magnetic conductor is integrally formed from an iron block, and the material of the magnetic steel sheet is a rare earth permanent magnet material; the magnetic steel sheet is bonded to the magnetic conductor, and / or, adjacent magnetic steel sheets are bonded to each other.

[0080] Clause 10. A vehicle loudspeaker includes a diaphragm and a voice coil connected to the diaphragm, the vehicle loudspeaker further including a magnetic circuit unit of the loudspeaker as described in any one of Clauses 1 to 9, the voice coil being movably inserted into a magnetic gap in the magnetic circuit unit.

[0081] Clause 11. A dual-diaphragm loudspeaker includes a bracket open at both ends, a first diaphragm disposed at a first end of the bracket, a first voice coil connected to the first diaphragm, a second diaphragm disposed at a second end of the bracket, and a second voice coil connected to the second diaphragm. The dual-diaphragm loudspeaker further includes a single magnetic circuit unit disposed between the first diaphragm and the second diaphragm.

[0082] The single magnetic circuit unit includes a magnetic conductor and multiple magnetic steel sheets. The magnetic conductor has a first surface facing the first diaphragm and a second surface facing the second diaphragm. A first mounting groove is formed on the first surface and a second mounting groove is formed on the second surface.

[0083] The first mounting groove is provided with m magnetic steel sheets, and the m magnetic steel sheets are spliced ​​together to form a closed first annular magnet. A magnetic gap is formed between the first annular magnet and the inner surface of the magnetic conductor for the insertion of the first voice coil.

[0084] The second mounting groove is provided with n magnetic steel sheets, and the n magnetic steel sheets are spliced ​​together to form a closed second annular magnet. A magnetic gap is formed between the second annular magnet and the inner surface of the magnetic conductor for the second voice coil to be inserted.

[0085] Where m and n are positive integers greater than 1.

[0086] Clause 12, the dual-diaphragm loudspeaker as described in Clause 11, where m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10.

[0087] Clause 13. The dual-diaphragm loudspeaker according to Clause 11, each of the magnets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

[0088] Clause 14. The dual-diaphragm loudspeaker according to Clause 12, wherein the first mounting slot and / or the second mounting slot includes a stepped surface, opposing first and second sidewalls, the first sidewall being located on the periphery of the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

[0089] Clause 15. The dual-diaphragm loudspeaker according to Clause 14, wherein the first sidewall and the second sidewall extend from the first surface or the second surface, the first mounting groove and / or the second mounting groove further includes a third sidewall opposite to the second sidewall, the third sidewall being located on the periphery of the second sidewall, the stepped surface connecting the first sidewall and the third sidewall, and the magnetic gap further includes the space between the third sidewall and the first sidewall; the distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall, and the height of the first sidewall is greater than or equal to the height of the magnet sheet.

[0090] Clause 16. In any one of Clauses 11 to 15, the first mounting groove and the second mounting groove are concentric rings projected onto the first surface or the second surface and the distance between them is greater than zero; the depth of the first mounting groove or the second mounting groove is greater than half the distance between the first surface and the second surface; the outer diameter of the first annular magnet is greater than the inner diameter of the second annular magnet; and the ratio of the thickness of the magnet sheet to the outer diameter of the first annular magnet or the second annular magnet is 1:(4~50).

[0091] Clause 17. In any one of Clauses 11 to 15, the magnetic conductor is integrally formed from an iron block, and the material of the magnet is a rare earth permanent magnet material; the magnet is bonded to the magnetic conductor, and / or adjacent magnets are bonded to each other.

[0092] Clause 18. A dual-diaphragm loudspeaker according to any one of Clauses 11 to 15, wherein the support includes a cylindrical body, the first diaphragm and the second diaphragm are respectively suspended on opposite ends of the cylindrical body, and the support further includes a retaining ring disposed within the cylindrical body, the magnetic conductor being fixed to the retaining ring.

[0093] Clause 19. The dual-diaphragm loudspeaker according to Clause 18, wherein the retaining ring is bent multiple times to have multiple staggered annular mounting surfaces, and the first or second surface of the magnetic conductor is fixed to the first mounting surface; the dual-diaphragm loudspeaker further includes a first spider sleeved on the first voice coil and a second spider sleeved on the second voice coil, the outer edge of the first spider being fixed to the second mounting surface, the outer edge of the second spider being fixed to the third mounting surface, the second mounting surface having an opposite orientation to the three mounting surfaces, and the first mounting surface having the same orientation as the second or third mounting surface.

[0094] Clause 20. The dual-diaphragm loudspeaker according to Clause 19, wherein the cylindrical body is provided with multiple through holes, the first voice coil is provided with multiple through holes, the second voice coil is provided with multiple through holes, and the fixing ring is provided with multiple through holes, so as to connect the various cavities inside the dual-diaphragm loudspeaker with the outside.

[0095] Clause 21. A method for assembling a dual-diaphragm loudspeaker as described in any one of Clauses 11 to 20, comprising a magnetic circuit unit mounting step, the magnetic circuit unit mounting step comprising: providing the magnetic conductor having a first mounting groove and a second mounting groove; placing m magnets in the first mounting groove to bond the m magnets in the first mounting groove and splice them together to form a closed first annular magnet; placing n magnets in the second mounting groove to bond the n magnets in the second mounting groove and splice them together to form a closed second annular magnet.

[0096] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0097] Those skilled in the art will understand that, unless otherwise stated, the singular forms “a,” “the,” and “the” used herein may also include the plural forms. It will be further understood that “multiple” in this disclosure refers to two or more, and other quantifiers are similarly understood.

[0098] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0099] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0100] The above embodiments are only for illustrating the technical concept and features of this disclosure, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this disclosure and implement it accordingly, and they cannot be used to limit the scope of protection of this disclosure.

Claims

1. A magnetic circuit unit for a loudspeaker, comprising a magnetic guide, wherein the magnetic guide has a mounting groove, the magnetic circuit unit comprises a plurality of magnets, the plurality of magnets being disposed in the mounting groove and spliced ​​together to form a closed annular magnet, wherein a magnetic gap is formed between the annular magnet and the surface of the magnetic guide for the insertion of a voice coil of the loudspeaker.

2. The magnetic circuit unit of the loudspeaker according to claim 1, wherein, One of the ring magnets is formed by splicing together 3 to 10 of the magnet sheets.

3. The magnetic circuit unit of the loudspeaker according to claim 2, wherein, One of the ring magnets is formed by splicing together 4, 6 or 8 of the magnet sheets.

4. The magnetic circuit unit of the loudspeaker according to any one of claims 1 to 3, wherein, Each of the magnetic steel sheets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

5. The magnetic circuit unit of the loudspeaker according to claim 4, wherein, The mounting groove includes a stepped surface, a first sidewall and a second sidewall, the first sidewall being located around the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

6. The magnetic circuit unit of the loudspeaker according to claim 5, wherein, The mounting groove also includes a third sidewall opposite to the second sidewall, the third sidewall being located around the second sidewall, the stepped surface connecting the first sidewall and the third sidewall, and the magnetic gap also including the space between the third sidewall and the first sidewall.

7. The magnetic circuit unit of the loudspeaker according to claim 6, wherein, The mounting groove is generally annular, the distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall, and the height of the first sidewall is greater than or equal to the height of the magnet sheet.

8. The magnetic circuit unit of the loudspeaker according to any of the preceding claims, wherein, The magnetic conductor has opposite first and second surfaces. The mounting groove includes a first mounting groove formed on the first surface and a second mounting groove formed on the second surface. The orthographic projections of the first and second mounting grooves onto the first or second surface are concentric rings and the distance between them is greater than zero. The depth of the first or second mounting groove is greater than half the distance between the first and second surfaces. The first and second mounting grooves are respectively provided with annular magnets formed by splicing multiple magnetic steel sheets. The outer diameter of one annular magnet is smaller than the inner diameter of another annular magnet. The ratio of the thickness of the magnetic steel sheet to the outer diameter of the annular magnet is 1:(4~50).

9. The magnetic circuit unit of the loudspeaker according to any of the preceding claims, wherein, The magnetic conductive component is integrally formed from an iron block, and the material of the magnetic steel sheet is rare earth permanent magnet material; the magnetic steel sheet is bonded to the magnetic conductive component, and / or, adjacent magnetic steel sheets are bonded to each other.

10. A vehicle loudspeaker, comprising a diaphragm and a voice coil connected to the diaphragm, wherein, The vehicle-mounted speaker further includes a magnetic circuit unit of the speaker as described in any one of claims 1 to 9, wherein the voice coil is movably inserted into the magnetic gap of the magnetic circuit unit.

11. A loudspeaker, comprising a bracket open at both ends, a first diaphragm disposed at a first end of the bracket, a first voice coil connected to the first diaphragm, a second diaphragm disposed at a second end of the bracket, a second voice coil connected to the second diaphragm, and a single magnetic circuit unit disposed between the first diaphragm and the second diaphragm; The single magnetic circuit unit includes a magnetic conductor and multiple magnetic steel sheets. The magnetic conductor has a first surface facing the first diaphragm and a second surface facing the second diaphragm. A first mounting groove is formed on the first surface and a second mounting groove is formed on the second surface. The first mounting groove is provided with m magnetic steel sheets, and the m magnetic steel sheets are spliced ​​together to form a closed first annular magnet. A magnetic gap is formed between the first annular magnet and the inner surface of the magnetic conductor for the insertion of the first voice coil. The second mounting groove is provided with n magnetic steel sheets, and the n magnetic steel sheets are spliced ​​together to form a closed second annular magnet. A magnetic gap is formed between the second annular magnet and the inner surface of the magnetic conductor for the second voice coil to be inserted. in, m and n are positive integers greater than 1.

12. The loudspeaker according to claim 11, wherein, m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10.

13. The loudspeaker according to claim 11 or 12, wherein, Each of the magnetic steel sheets includes an opposite top surface and a bottom surface, and a plurality of side surfaces located between the top surface and the bottom surface, at least one of the side surfaces being fixedly connected to the magnetic conductor, and the top surface and / or the bottom surface being fan-shaped.

14. The loudspeaker according to claim 12, wherein, The first mounting groove and / or the second mounting groove includes a stepped surface, a first sidewall and a second sidewall opposite to each other, the first sidewall being located around the second sidewall, the stepped surface extending laterally from the first sidewall toward the second sidewall, one side of the magnet being fixedly connected to the first sidewall, the bottom surface of the magnet being fixedly connected to the stepped surface, and the magnetic gap including the space between the magnet and the second sidewall.

15. The loudspeaker according to claim 14, wherein, The first sidewall and the second sidewall extend from the first surface or the second surface. The first mounting groove and / or the second mounting groove also include a third sidewall opposite to the second sidewall. The third sidewall is located on the periphery of the second sidewall. The stepped surface connects the first sidewall and the third sidewall. The magnetic gap also includes the space between the third sidewall and the first sidewall. The distance between the first sidewall and the second sidewall is greater than the distance between the third sidewall and the second sidewall. The height of the first sidewall is greater than or equal to the height of the magnetic steel sheet.

16. The loudspeaker according to any one of claims 11 to 15, wherein, The first mounting groove and the second mounting groove are concentric rings projected onto the first surface or the second surface, and the distance between them is greater than zero. The depth of the first mounting groove or the second mounting groove is greater than half the distance between the first surface and the second surface. The outer diameter of the first annular magnet is greater than the inner diameter of the second annular magnet. The ratio of the thickness of the magnet sheet to the outer diameter of the first annular magnet or the second annular magnet is 1:(4~50).

17. The loudspeaker according to any one of claims 11 to 16, wherein, The magnetic conductive component is integrally formed from an iron block, and the material of the magnetic steel sheet is rare earth permanent magnet material; the magnetic steel sheet is bonded to the magnetic conductive component, and / or, adjacent magnetic steel sheets are bonded to each other.

18. The loudspeaker according to any one of claims 11 to 17, wherein, The support includes a cylindrical body, with the first diaphragm and the second diaphragm respectively suspended at opposite ends of the cylindrical body. The support also includes a fixing ring disposed inside the cylindrical body, and the magnetic conductive element is fixed to the fixing ring.

19. The loudspeaker according to claim 18, wherein, The fixing ring is bent multiple times to have multiple staggered annular mounting surfaces. The first or second surface of the magnetic conductor is fixed to the first mounting surface. The loudspeaker also includes a first spring fitted on the first voice coil and a second spring fitted on the second voice coil. The outer edge of the first spring is fixed to the second mounting surface, and the outer edge of the second spring is fixed to the third mounting surface. The second mounting surface and the three mounting surfaces have opposite orientations, and the first mounting surface has the same orientation as the second or third mounting surface.

20. The loudspeaker according to claim 19, wherein, The cylindrical body has multiple through holes, the first voice coil has multiple through holes, the second voice coil has multiple through holes, and the fixing ring has multiple through holes to connect the various cavities inside the speaker with the outside.

21. A method for assembling a loudspeaker as described in any one of claims 11 to 20, comprising a magnetic circuit unit installation step, the magnetic circuit unit installation step comprising: Provide the magnetic conductive element having a first mounting slot and a second mounting slot; m magnetic steel pieces are placed in the first mounting groove to bond the m magnetic steel pieces in the first mounting groove and splice them together to form a closed first annular magnet; n magnetic steel sheets are placed in the second mounting groove to bond the n magnetic steel sheets in the second mounting groove and splice them together to form a closed second annular magnet.

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