Double-diaphragm loudspeaker and assembling method thereof

Abstract

The invention discloses a double-diaphragm loudspeaker and an assembling method thereof. The double-diaphragm loudspeaker comprises a single magnetic circuit unit arranged between a first diaphragm and a second diaphragm. The magnetic circuit unit comprises a magnetic conductive piece and a plurality of magnetic steel sheets, the magnetic conductive piece is provided with a first surface facing the first vibrating diaphragm and a second surface facing the second vibrating diaphragm, the first surface is provided with a first mounting groove, and the second surface is provided with a second mounting groove; m magnetic steel sheets are arranged in the first mounting groove, the m magnetic steel sheets are mutually spliced to form closed first annular magnetic steel, and a magnetic gap for inserting the first voice coil is formed between the first annular magnetic steel and the inner surface of the magnetic conductive piece; n magnetic steel sheets are arranged in the second mounting groove, the n magnetic steel sheets are mutually spliced to form closed second annular magnetic steel, and a magnetic gap for insertion of a second voice coil is formed between the second annular magnetic steel and the inner surface of the magnetic conductive piece; wherein m and n are positive integers greater than 1. The double-diaphragm loudspeaker is high in sensitivity, small in distortion, good in voice coil heat dissipation and small in overall height.

Description

Technical Field

[0001] The invention belongs to the field of loudspeakers, and in particular relates to a double-diaphragm loudspeaker and an assembling method thereof. Background Art

[0002] The magnetic circuit unit is an important component of the dynamic speaker, providing driving force for the vibration system such as the voice coil and the sound basin. The magnetic circuit unit generally includes magnetic conductive parts and magnetic steel, and in some cases also includes the front plate, etc. Among them, the magnetic steel plays a vital role in the driving force of the magnetic circuit unit. At present, the magnetic circuit units used in traditional electric speakers are mostly axial magnetic circuits, that is, an integrated annular magnetic steel or circular magnetic steel is used, which is also a common structural form in the industry. To a certain extent, the design of this magnetic circuit has a low magnetic field energy conversion rate and low sensitivity, and this structure also determines the uneven density distribution of the magnetic flux, and the possibility of nonlinear distortion will increase.

[0003] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present application and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] The present invention provides a dual-diaphragm loudspeaker with high sensitivity, low distortion, good heat dissipation of the voice coil, compact structure and small overall height. The present invention also provides an assembly method of the dual-diaphragm loudspeaker.

[0005] The present invention adopts the following technical solution:

[0006] A dual-diaphragm loudspeaker, comprising a bracket with two ends open, a first diaphragm arranged on a first end of the bracket, a first voice coil connected to the first diaphragm, a second diaphragm arranged on a second end of the bracket, and a second voice coil connected to the second diaphragm, the dual-diaphragm loudspeaker further comprising a single magnetic circuit unit, the single magnetic circuit unit being arranged between the first diaphragm and the second diaphragm;

[0007] The single magnetic circuit unit comprises a magnetic conductive member and a plurality of magnetic steel sheets, wherein the magnetic conductive member has a first surface facing the first diaphragm and a second surface facing the second diaphragm, a first mounting groove is provided on the first surface, and a second mounting groove is provided on the second surface;

[0008] The first installation groove is provided with m magnetic steel sheets, the m magnetic steel sheets are spliced ​​together to form a closed first annular magnetic steel, and a magnetic gap is formed between the first annular magnetic steel and the inner surface of the magnetic conductive member for the first voice coil to be inserted;

[0009] The second mounting groove is provided with n magnetic steel sheets, the n magnetic steel sheets are spliced ​​together to form a closed second annular magnetic steel, and a magnetic gap is formed between the second annular magnetic steel and the inner surface of the magnetic conductive member for the second voice coil to be inserted;

[0010] Wherein, m and n are positive integers greater than 1.

[0011] In a preferred embodiment, m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10.

[0012] In a preferred embodiment, each of the magnetic steel sheets includes opposite top and bottom surfaces, and multiple side surfaces located between the top and bottom surfaces, at least one of the side surfaces is fixedly connected to the magnetic conductive component, and the top surface and / or the bottom surface is in the shape of a fan ring.

[0013] In a more preferred embodiment, the first mounting groove and / or the second mounting groove includes a step surface, a first side wall and a second side wall opposite to each other, the first side wall is located at the periphery of the second side wall, the step surface extends laterally from the first side wall toward the second side wall, one side surface of the magnetic steel sheet is fixedly connected to the first side wall, the bottom surface of the magnetic steel sheet is fixedly connected to the step surface, and the magnetic gap includes the space between the magnetic steel sheet and the second side wall.

[0014] In a further preferred embodiment, the first side wall and the second side wall extend from the first surface or the second surface, the first mounting groove and / or the second mounting groove also include a third side wall opposite to the second side wall, the third side wall is located at the periphery of the second side wall, the step surface is connected between the first side wall and the third side wall, and the magnetic gap also includes the space between the third side wall and the first side wall; the distance between the first side wall and the second side wall is greater than the distance between the third side wall and the second side wall, and the height of the first side wall is greater than or equal to the height of the magnetic steel sheet.

[0015] In a preferred embodiment, the orthographic projections of the first mounting groove and the second mounting groove on the first surface or the second surface are concentric rings and the distance between the two is greater than zero, the depth of the first mounting groove or the second mounting groove is greater than half of the distance between the first surface and the second surface, the outer diameter of the first annular magnetic steel is greater than the inner diameter of the second annular magnetic steel; the ratio of the thickness of the magnetic steel sheet to the outer diameter of the first annular magnetic steel or the second annular magnetic steel is 1:(4~50).

[0016] In a preferred embodiment, the magnetic conductive part is integrally formed by an iron block, and the material of the magnetic steel sheet is a rare earth permanent magnetic material; the magnetic steel sheet is bonded to the magnetic conductive part, and / or adjacent magnetic steel sheets are bonded to each other.

[0017] In a preferred embodiment, the bracket includes a cylinder, the first diaphragm and the second diaphragm are respectively suspended on two opposite ends of the cylinder, and the bracket also includes a fixing ring arranged in the cylinder, and the magnetic conductive member is fixed on the fixing ring.

[0018] In a more preferred embodiment, the fixing ring is bent multiple times to have a plurality of annular mounting surfaces that are staggered from each other, and the first surface or the second surface of the magnetic conductive member is fixed on the first mounting surface; the dual-diaphragm loudspeaker also includes a first elastic wave mounted on the first voice coil and a second elastic wave mounted on the second voice coil, the outer edge of the first elastic wave is fixed on the second mounting surface, the outer edge of the second elastic wave is fixed on the third mounting surface, the second mounting surface and the three mounting surfaces are oriented oppositely, and the first mounting surface has the same orientation as the second mounting surface or the third mounting surface.

[0019] In a further preferred embodiment, the cylinder is provided with a plurality of through holes, the first voice coil is provided with a plurality of through holes, the second voice coil is provided with a plurality of through holes, and the fixing ring is provided with a plurality of through holes to connect the various cavities inside the dual-diaphragm speaker with the outside world.

[0020] The present invention also adopts the following technical solution:

[0021] An assembly method of the dual-diaphragm loudspeaker as described above includes a magnetic circuit unit installation step, wherein the magnetic circuit unit installation step includes:

[0022] Providing the magnetic conductive member having a first mounting groove and a second mounting groove;

[0023] Placing m magnetic steel sheets in the first installation groove, so that the m magnetic steel sheets are bonded in the first installation groove and spliced ​​together to form a closed first annular magnetic steel;

[0024] Place n magnetic steel sheets in the second installation groove, so that the n magnetic steel sheets are bonded in the second installation groove and spliced ​​together to form a closed second annular magnetic steel.

[0025] The present invention adopts the above solution, which has the following advantages compared with the prior art:

[0026] The dual-diaphragm speaker of the present invention adopts a specially designed magnetic circuit unit, which can effectively reduce the distortion of the speaker, make the magnetic flux density more uniform, and achieve higher energy conversion, which is beneficial to improving the sensitivity of the speaker. The dual-diaphragm speaker has low distortion, high sensitivity, and good heat dissipation of the voice coil; the overall structure is compact, and the overall height can be reduced, so it is suitable for use as a car speaker to reduce the space occupied in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 The figure is a stereogram of a vehicle-mounted speaker according to an embodiment of the present invention.

[0029] Figure 2 The figure is a front view of a vehicle-mounted speaker according to an embodiment of the present invention.

[0030] Figure 3 The figure is a top view of a vehicle-mounted speaker according to an embodiment of the present invention.

[0031] Figure 4 The figure is an exploded view of a vehicle-mounted speaker according to an embodiment of the present invention.

[0032] Figure 5 4 is a structural diagram of a bracket according to an embodiment of the present invention.

[0033] Figure 6 Detailed description of the invention The figure is an exploded view of a magnetic circuit unit according to an embodiment of the present invention.

[0034] Figure 7 is a cross-sectional view of a magnetic circuit unit according to an embodiment of the present invention.

[0035] Figure 8 FIG. 4 is a structural diagram of half of a vehicle-mounted speaker according to an embodiment of the present invention.

[0036] Fig. 9 The figure is a cross-sectional view of a vehicle-mounted speaker according to an embodiment of the present invention.

[0037] Fig.10 This is a schematic diagram of a magnetic circuit unit used in a car speaker of a comparative example.

[0038] Fig.11 Graphs showing distortion curves of the vehicle-mounted speakers of the embodiment and the comparative example.

[0039] Fig.12a and Figure 12b Schematic diagrams of magnetic fields of a magnetic circuit unit of an embodiment and a magnetic circuit unit of a comparative example respectively.

[0040] In the above figures,

[0041] 1. bracket; 11. cylinder; 111. through hole; 12. fixing ring;

[0042] 21. first diaphragm; 22. second diaphragm;

[0043] 31. First voice coil; 32. Second voice coil;

[0044] 41. The first wave; 42. The second wave;

[0045] 5. Magnetic circuit unit; 51. Magnetic conductive member; 51a. First surface; 51b. Second surface; 510. Magnetic gap; 511. First mounting groove; 512. Second mounting groove; 513. Step surface; 514. First side wall; 515. Second side wall; 516. Third side wall; 520. Magnetic steel sheet; 521. First annular magnetic steel; 522. Second annular magnetic steel;

[0046] 6. Dust cap. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] In this article, the directional words "upper", "lower" and "horizontal" are intended to facilitate the understanding of the structure of the speaker and its magnetic circuit unit by those skilled in the art, and are not used to limit the state of the speaker and its magnetic circuit unit after being installed in the use scenario. For example, the speaker can be installed on a horizontal surface, an inclined surface or a vertical surface of a vehicle.

[0049] Figures 1 to 9 The drawings are drawn in true proportion. To keep the specification concise, the proportions of each component are not listed one by one. However, the proportions and positions of each component should be regarded as part of the content of this specification.

[0050] Example

[0051] Figures 1 to 9 A speaker of the present embodiment is shown, which may be, for example, a door panel speaker of a car, installed on the door panel of the car to radiate low-frequency sounds into the car compartment.

[0052] Reference Figures 1 to 9 As shown, the speaker is specifically a dual-diaphragm speaker, which includes a bracket 1 with two open ends, a first diaphragm 21 arranged on the first end of the bracket 1, a first voice coil 31 connected to the first diaphragm 21, a second diaphragm 22 arranged on the second end of the bracket 1, a second voice coil 32 connected to the second diaphragm 22, a first elastic wave 41 sleeved on the first voice coil 31, and a second elastic wave 42 sleeved on the second voice coil 32. The dual-diaphragm speaker also includes a single magnetic circuit unit 5, which is arranged between the first diaphragm 21 and the second diaphragm 22.

[0053] Figure 6 to Figure 7 A magnetic circuit unit 5 is shown. Figure 6 and Figure 7 As shown, the magnetic circuit unit 5 includes a magnetic conductive member 51 and a plurality of magnetic steel sheets 520. A mounting groove is provided in the magnetic conductive member 51, and the magnetic circuit unit 5 includes a plurality of magnetic steel sheets 520. The plurality of magnetic steel sheets 520 are arranged in the mounting groove and spliced ​​together to form a closed annular magnetic steel. A magnetic gap 510 is formed between the surface of the annular magnetic steel and the surface of the magnetic conductive member 51 for the voice coil of the speaker to be inserted. An annular magnetic steel can be formed by splicing 3 to 10 magnetic steel sheets 520. Furthermore, an annular magnetic steel can be formed by splicing 4, 6 or 8 magnetic steel sheets 520. The magnetic steel sheets 520 used in different annular magnetic steels can be the same or different.

[0054] like Figure 6 and Figure 7 In the specific example shown, the magnetic conductive member 51 has a first surface 51a, a first mounting groove 511 is provided on the first surface 51a, and m magnetic steel sheets 520 are provided in the first mounting groove 511, and the m magnetic steel sheets 520 are spliced ​​together to form a closed first annular magnetic steel 521. A magnetic gap 510 for inserting a voice coil is formed between the first annular magnetic steel 521 and the inner surface of the magnetic conductive member 51. Further, the magnetic conductive member 51 has a second surface 51b opposite to the first surface 51a, and a second mounting groove 512 is provided on the second surface 51b. n magnetic steel sheets 520 are provided in the second mounting groove 512, and the n magnetic steel sheets 520 are spliced ​​together to form a closed second annular magnetic steel 522. A magnetic gap 510 for inserting another voice coil is formed between the second annular magnetic steel 522 and the inner surface of the magnetic conductive member 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, n=6. In this embodiment, the magnetic steel sheet 520 constituting the first annular magnetic steel 521 and the magnetic steel sheet 520 constituting the second annular magnetic steel 522 have different shapes and sizes. If the first annular magnetic steel 521 and the second annular magnetic steel 522 have the same shape and size, the magnetic steel sheets 520 of the same specification can be used for both.

[0055] Each magnetic steel sheet 520 includes an opposite top surface and a bottom surface, and a plurality of side surfaces between the top surface and the bottom surface, at least one side surface is fixedly connected to the magnetic conductive member 51, and the top surface and / or the bottom surface are in the shape of a sector ring. Specifically in this embodiment, the overall shape of the magnetic steel sheet 520 is similar to a tile, wherein the two side surfaces are arc surfaces, the top surface and the bottom surface are parallel planes, and the shape and size are exactly the same, and they are in the shape of a sector ring with the same area.

[0056] The first mounting groove 511 includes a step surface 513, an opposite first side wall 514 and a second side wall 515, the first side wall 514 is located at the periphery of the second side wall 515, the step surface 513 extends laterally from the first side wall 514 toward the second side wall 515, a side surface of the magnetic steel sheet 520 is fixedly connected to the first side wall 514, the bottom surface of the magnetic steel sheet 520 is fixedly connected to the step surface 513, and the magnetic gap 510 includes the space between the magnetic steel sheet 520 and the second side wall 515.

[0057] Similar to the first mounting groove 511, the second mounting groove 512 also includes a step surface 513, a first side wall 514 and a second side wall 515 opposite to each other. The first side wall 514 is located at the periphery of the second side wall 515, and the step surface 513 extends laterally from the first side wall 514 toward the second side wall 515. One side surface of the magnetic steel sheet 520 is fixedly connected to the first side wall 514, and the bottom surface of the magnetic steel sheet 520 is fixedly connected to the step surface 513. The magnetic gap 510 includes the space between the magnetic steel sheet 520 and the second side wall 515.

[0058] The first side wall 514 and the second side wall 515 of the first mounting groove 511 extend downward from the first surface 51a. The first mounting groove 511 also includes a third side wall 516 opposite to the second side wall 515, and the third side wall 516 is located at the periphery of the second side wall 515 and below the first side wall 514. The step surface 513 is connected between the first side wall 514 and the third side wall 516, and there is a gap between the step surface 513 and the second side wall 515. The magnetic gap 510 also includes a gap between the third side wall 516 and the first side wall 514, the spacing between the first side wall 514 and the second side wall 515 is greater than the spacing between the third side wall 516 and the second side wall 515, and the height of the first side wall 514 is greater than or equal to the height of the magnetic steel sheet 520, so that the magnetic steel sheet 520 of the first annular magnetic steel 521 will not be exposed from the upper surface of the magnetic conductive member 51, that is, the magnetic steel sheet 520 of the first annular magnetic steel 521 is embedded in the magnetic conductive member 51 as a whole.

[0059] The first side wall 514 and the second side wall 515 of the second mounting groove 512 extend upward from the second surface 51b. The second mounting groove 512 also includes a third side wall 516 opposite to the second side wall 515, and the third side wall 516 is located at the periphery of the second side wall 515 and above the first side wall 514. The step surface 513 is connected between the first side wall 514 and the third side wall 516, and there is a gap between the step surface 513 and the second side wall 515. The magnetic gap 510 also includes a gap between the third side wall 516 and the first side wall 514, the spacing between the first side wall 514 and the second side wall 515 is greater than the spacing between the third side wall 516 and the second side wall 515, and the height of the first side wall 514 is greater than or equal to the height of the magnetic steel sheet 520, so that the magnetic steel sheet 520 of the second annular magnetic steel 522 will not be exposed from the lower surface of the magnetic conductive member 51, that is, the magnetic steel sheet 520 of the second annular magnetic steel 522 is embedded in the magnetic conductive member 51 as a whole.

[0060] The orthographic projections of the first mounting groove 511 and the second mounting groove 512 on the first surface 51a or the second surface 51b are concentric rings and the distance between the two is greater than zero. Furthermore, the orthographic projection of the first mounting groove 511 on the first surface 51a or the second surface 51b is a circular ring, and the orthographic projection of the second mounting groove 512 on the first surface 51a or the second surface 51b is also a circular ring. The outer diameter of the first annular magnetic steel 521 is greater than the inner diameter of the second annular magnetic steel 522. The depth of the first mounting groove 511 or the second mounting groove 512 is greater than half of the distance between the first surface 51a and the second surface 51b, and in the height / depth direction, the first mounting groove 511 and the second mounting groove 512 partially overlap each other. The ratio of the thickness of the magnetic steel sheet 520 to the outer diameter of the first annular magnetic steel 521 or the second annular magnetic steel 522 is 1:(4~50), preferably 1:(10~30).

[0061] The magnetic conductive member 51 is integrally formed from an iron block, for example, by punching out a mounting groove on a complete iron block. The material of the magnetic steel sheet 520 is a rare earth permanent magnetic material. The magnetic steel sheet 520 is bonded to the magnetic conductive member 51 by glue, and further, adjacent magnetic steel sheets 520 are also bonded to each other by glue. There is a very small gap between adjacent magnetic steel sheets 520, and the width of the gap is much smaller than the outer diameter of the annular magnetic steel, for example, less than 1 / 100 of the outer diameter of the annular magnetic steel.

[0062] Combination Figure 6 and Figure 7 As shown, the first surface 51a of the magnetic conductive member 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 magnetic steel 521 and the inner surface of the magnetic conductive member 51 for the first voice coil 31 to be inserted into; a magnetic gap 510 is formed between the second annular magnetic steel 522 and the inner surface of the magnetic conductive member 51 for the second voice coil 32 to be inserted into.

[0063] The bracket 1 may be an integral component formed by plastic injection molding. The bracket 1 includes a barrel 11, and a first diaphragm 21 and a second diaphragm 22 are respectively suspended on opposite ends of the barrel 11. The speaker is mounted and fixed on the car through the barrel 11, and the barrel 11 may be provided with mounting structures such as mounting holes. The barrel 11 is also provided with a wiring port, which includes a welding piece, and the leads of the first voice coil 31 and the second voice coil 32 are connected to the welding piece, so as to facilitate connection with a power amplifier and the like, and to access the audio electrical signal.

[0064] The bracket 1 also includes a fixing ring 12 disposed in the cylinder 11, and the magnetic conductive member 51 is fixed on the fixing ring 12. The fixing ring 12 is bent multiple times and has multiple mutually staggered annular mounting surfaces. The first surface 51a or the second surface 51b of the magnetic conductive member 51 is fixed to the first mounting surface. The outer edge of the first elastic wave 41 is fixed to the second mounting surface, and the outer edge of the second elastic wave 42 is fixed to the third mounting surface. The second mounting surface is opposite to the three mounting surfaces, and the first mounting surface has the same orientation as the second mounting surface or the third mounting surface. For example, specifically to the attached Figure 7 and 8 In the example, the first mounting surface and the second mounting surface face the first diaphragm 21, that is, face upward; and the third mounting surface faces the second diaphragm 22, that is, faces downward.

[0065] The cylinder 11 is provided with a plurality of through holes 111, the first voice coil 31 is provided with a plurality of through holes, the second voice coil 32 is provided with a plurality of through holes, and the fixing ring 12 is provided with a plurality of through holes to connect the various cavities inside the dual-diaphragm speaker with the outside world to facilitate heat dissipation.

[0066] The speaker further includes a dust cap 6. The upper end of the first voice coil 31 is closed by a dust cap 6, and the dust cap 6 is connected to the first diaphragm 21. The lower end of the second voice coil 32 is closed by another dust cap 6, and the dust cap 6 is connected to the second diaphragm 22.

[0067] It should also be noted that the first diaphragm 21 has a truncated cone-shaped cone, and the second diaphragm 22 also has a truncated cone-shaped cone. The internal components of the speaker are all placed in the cylinder 11 and will not protrude outside the cylinder 11, and are well protected by the cylinder 11.

[0068] The above-mentioned dual-diaphragm loudspeaker assembly method includes the step of installing the magnetic circuit unit 5. The step of installing the magnetic circuit unit 5 specifically includes:

[0069] Providing a magnetic conductive member 51 having a first mounting groove 511 and a second mounting groove 512;

[0070] Place m magnetic steel sheets 520 in the first installation groove 511, so that the m magnetic steel sheets 520 are bonded in the first installation groove 511 and spliced ​​together to form a closed first annular magnetic steel 521;

[0071] The n magnetic steel sheets 521 are placed in the second installation groove 512 , so that the n magnetic steel sheets 520 are bonded in the second installation groove 512 and spliced ​​together to form a closed second annular magnetic steel 522 .

[0072] Comparative Example

[0073] The comparative example provides a dual-diaphragm loudspeaker similar to the embodiment, the difference being that a different magnetic circuit unit is used, and the rest is basically the same as the embodiment.

[0074] Specifically, Fig.10 As shown, the first annular magnetic steel 521 ′ and the second annular magnetic steel 522 ′ of the magnetic circuit unit 5 ′ are an integrated structure, and both are directly inserted into the magnetic conductive member 51 ′.

[0075] Performance Testing

[0076] The distortion curves of the dual-diaphragm loudspeakers of the embodiment and the comparative example are as follows: Fig.11 As shown, it can be seen that the distortion of the speaker of the embodiment is lower than that of the speaker of the comparative example.

[0077] The reasons are as follows:

[0078] Fig.12a : shows the magnetic field distribution of the magnetic circuit unit 5 used in the embodiment, Figure 12b The magnetic field distribution of the magnetic circuit unit 5' used in the comparative example is shown. By comparison, it can be seen that the directions of the magnetic flux lines of the two are significantly different, and the magnetic field distribution is significantly different. The energy conversion of the design structure of the magnetic circuit unit 5' in the comparative example is insufficient or even low, which may cause the sensitivity of the speaker to become low; the density distribution of the magnetic flux is uneven, and nonlinear distortion occurs. The design of the magnetic circuit unit 5 of the embodiment can well improve the characteristics of sensitivity and low distortion, and at the same time can well solve the problem of heat dissipation of the voice coil.

[0079] The magnetic circuit unit 5 of the embodiment solves the above problems of low energy conversion rate, low sensitivity, and uneven magnetic flux density distribution, and can greatly improve the characteristics of sensitivity and low distortion, while also solving the problem of heat dissipation of the voice coil. The design structure of the dual magnetic circuit structure utilizes the gap structure design of the magnetic circuit, and rationally utilizes the internal structure of the magnetic circuit, which can effectively reduce the height of the entire magnetic circuit unit 5 and the speaker. The magnetic circuit unit 5 of the embodiment can effectively reduce the distortion of the speaker, the magnetic flux density is more uniform, the energy conversion is higher, and it is beneficial to improve the sensitivity of the speaker. The speaker of the embodiment has low distortion, high sensitivity, and good heat dissipation of the voice coil; it can also reduce the overall height, which is suitable for use as a vehicle-mounted speaker and reduces the space occupied in the car.

[0080] As shown in this specification and claims, the terms "comprises" and "includes" 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 device may also include other steps or elements.

[0081] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto.

[0082] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0083] The above embodiment is only for illustrating the technical concept and features of the present invention, and is a preferred embodiment. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention.

Claims

1. A dual-diaphragm loudspeaker, comprising a bracket with two open ends, a first diaphragm disposed on a first end of the bracket, a first voice coil connected to the first diaphragm, a second diaphragm disposed on a second end of the bracket, and a second voice coil connected to the second diaphragm, characterized in that: The dual-diaphragm loudspeaker further comprises a single magnetic circuit unit, and the single magnetic circuit unit is arranged between the first diaphragm and the second diaphragm; The single magnetic circuit unit comprises a magnetic conductive member and a plurality of magnetic steel sheets, wherein the magnetic conductive member has a first surface facing the first diaphragm and a second surface facing the second diaphragm, a first mounting groove is provided on the first surface, and a second mounting groove is provided on the second surface; The first installation groove is provided with m magnetic steel sheets, the m magnetic steel sheets are spliced ​​together to form a closed first annular magnetic steel, and a magnetic gap is formed between the first annular magnetic steel and the inner surface of the magnetic conductive member for the first voice coil to be inserted; The second mounting groove is provided with n magnetic steel sheets, the n magnetic steel sheets are spliced ​​together to form a closed second annular magnetic steel, and a magnetic gap is formed between the second annular magnetic steel and the inner surface of the magnetic conductive member for the second voice coil to be inserted; Wherein, m and n are positive integers greater than 1.

2. The dual-diaphragm loudspeaker according to claim 1, characterized in that: m is a positive integer between 3 and 10, and n is a positive integer between 3 and 10.

3. The dual-diaphragm loudspeaker according to claim 1, characterized in that: Each of the magnetic steel sheets includes opposite top and bottom surfaces, and a plurality of side surfaces between the top and bottom surfaces, at least one of the side surfaces is fixedly connected to the magnetic conductive member, and the top surface and / or the bottom surface is in the shape of a fan ring.

4. The dual diaphragm loudspeaker according to claim 2, characterized in that: The first mounting groove and / or the second mounting groove includes a step surface, a first side wall and a second side wall opposite to each other, the first side wall is located at the periphery of the second side wall, the step surface extends laterally from the first side wall toward the second side wall, one side surface of the magnetic steel sheet is fixedly connected to the first side wall, the bottom surface of the magnetic steel sheet is fixedly connected to the step surface, and the magnetic gap includes the space between the magnetic steel sheet and the second side wall.

5. The dual diaphragm loudspeaker according to claim 4, characterized in that: The first side wall and the second side wall extend from the first surface or the second surface, the first mounting groove and / or the second mounting groove also include a third side wall opposite to the second side wall, the third side wall is located at the periphery of the second side wall, the step surface is connected between the first side wall and the third side wall, and the magnetic gap also includes the space between the third side wall and the first side wall; the distance between the first side wall and the second side wall is greater than the distance between the third side wall and the second side wall, and the height of the first side wall is greater than or equal to the height of the magnetic steel sheet.

6. The dual-diaphragm loudspeaker according to any one of claims 1 to 5, characterized in that: The orthographic projections of the first mounting groove and the second mounting groove on the first surface or the second surface are concentric rings and the distance between the two is greater than zero, the depth of the first mounting groove or the second mounting groove is greater than half of the distance between the first surface and the second surface, the outer diameter of the first annular magnetic steel is greater than the inner diameter of the second annular magnetic steel; the ratio of the thickness of the magnetic steel sheet to the outer diameter of the first annular magnetic steel or the second annular magnetic steel is 1:(4~50).

7. The dual-diaphragm loudspeaker according to any one of claims 1 to 5, characterized in that: The magnetic conductive part is integrally formed from an iron block, and the material of the magnetic steel sheet is a rare earth permanent magnetic material; the magnetic steel sheet is bonded to the magnetic conductive part, and / or adjacent magnetic steel sheets are bonded to each other.

8. The dual-diaphragm loudspeaker according to any one of claims 1 to 5, characterized in that: The bracket includes a cylinder, the first diaphragm and the second diaphragm are respectively suspended on two opposite ends of the cylinder, and the bracket also includes a fixing ring arranged in the cylinder, and the magnetic conductive member is fixed on the fixing ring.

9. The dual-diaphragm loudspeaker according to claim 8, characterized in that: The fixing ring is bent multiple times to have multiple annular mounting surfaces that are staggered from each other, and the first surface or the second surface of the magnetic conductive component is fixed on the first mounting surface; the dual-diaphragm loudspeaker also includes a first elastic wave mounted on the first voice coil and a second elastic wave mounted on the second voice coil, the outer edge of the first elastic wave is fixed on the second mounting surface, and the outer edge of the second elastic wave is fixed on the third mounting surface, the second mounting surface and the three mounting surfaces are in opposite directions, and the first mounting surface has the same direction as the second mounting surface or the third mounting surface.

10. The dual-diaphragm loudspeaker according to claim 9, characterized in that: The cylinder is provided with a plurality of through holes, the first voice coil is provided with a plurality of through holes, the second voice coil is provided with a plurality of through holes, and the fixing ring is provided with a plurality of through holes, so as to connect the various cavities inside the dual-diaphragm speaker with the outside world.

11. A method for assembling a dual-diaphragm loudspeaker as claimed in any one of claims 1 to 10, characterized in that: The method comprises the steps of installing a magnetic circuit unit, wherein the steps of installing the magnetic circuit unit include: Providing the magnetic conductive member having a first mounting groove and a second mounting groove; Placing m magnetic steel sheets in the first installation groove, so that the m magnetic steel sheets are bonded in the first installation groove and spliced ​​together to form a closed first annular magnetic steel; Place n magnetic steel sheets in the second installation groove, so that the n magnetic steel sheets are bonded in the second installation groove and spliced ​​together to form a closed second annular magnetic steel.

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