Loudspeaker with double magnetic circuits

Abstract

The utility model discloses a double-magnetic-circuit loudspeaker, which comprises a basin stand, a voice coil and a vibrating diaphragm, and is characterized in that a magnetic circuit assembly is further mounted in the basin stand and comprises an inner ring magnetic circuit and an outer ring magnetic circuit; the inner ring magnetic circuit is formed by sequentially overlapping an upper-layer axial inner magnet, a middle washer and a lower-layer axial inner magnet; the outer ring magnetic circuit is formed by sequentially overlapping an upper-layer axial outer magnet, a middle radial outer magnet and a lower-layer axial outer magnet; the radial inner magnetic ring is replaced by the design of the washer, the problems that the radial inner magnetic ring is small in size, difficult to machine, high in machining cost, too small in size and difficult to magnetize can be solved under the condition that the sensitivity of the loudspeaker is not reduced, and the washer is lower in cost than the radial inner magnetic ring.

Description

Technical Field

[0001] The utility model relates to the technology of the loudspeaker field, in particular to a double-magnetic-circuit loudspeaker. Background Art

[0002] A speaker, also known as a loudspeaker, is an electroacoustic transducer that converts electrical energy into sound energy through a certain physical effect. When different electronic energies are transmitted to the speaker's voice coil, the voice coil generates a kind of energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electronic energy changes at any time, the speaker's voice coil will move forward or backward, so the speaker's diaphragm will move with it. This action changes the density of the air and produces sound.

[0003] In the prior art, it is difficult to reduce the size of the radiating ring magnetic circuit, which makes it difficult to apply it to smaller in-ear or clip-on earphone speakers. At the same time, if the size is too large, not only the amount of material used is large, but also the weight is heavy, which makes it difficult to reduce the cost.

[0004] Secondly, the magnetic circuit size is too large. When designing the speaker, the rear cavity sound outlet of the speaker can only be made on the inner magnetic center hole. When installing headphones on such a speaker, other parts of the rear cavity must avoid the speaker tuning center hole, which will waste a lot of headphone rear cavity space.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0006] In view of this, the present invention aims to overcome the deficiencies in the prior art, and its main purpose is to provide a dual magnetic circuit speaker, which solves the problems of small size and high processing cost of the radial inner magnetic ring, and the radial inner magnetic ring being too small and difficult to fully magnetize through the structural design of the magnetic circuit component.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A dual-magnetic-circuit speaker comprises a basin frame, a voice coil and a diaphragm, wherein the voice coil and the diaphragm are mounted on the basin frame;

[0009] A magnetic circuit assembly is also installed in the basin frame, and the magnetic circuit assembly includes an inner ring magnetic circuit and an outer ring magnetic circuit; the outer ring magnetic circuit has an outer ring hole, and the outer ring magnetic circuit is sleeved outside the inner ring magnetic circuit through the outer ring hole, and the outer wall of the inner ring magnetic circuit and the inner wall of the outer ring magnetic circuit form an annular gap, the voice coil is at least partially located in the annular gap, and the diaphragm is connected to the voice coil;

[0010] The inner ring magnetic circuit is sequentially formed by stacking an upper axial inner magnet, a middle washer and a lower axial inner magnet; the outer ring magnetic circuit is sequentially formed by stacking an upper axial outer magnet, a middle radial outer magnet and a lower axial outer magnet.

[0011] As a preferred solution, the magnetic circuit assembly also includes a magnetic conductive plate, and the ends of the outer ring magnetic circuit and the inner ring magnetic circuit away from the diaphragm are located above the magnetic conductive plate, and the magnetic conductive plate is installed at the bottom end of the basin frame.

[0012] As a preferred embodiment, the upper axial inner magnet, the middle washer and the lower axial inner magnet all have inner ring holes, and the upper axial inner magnet, the middle washer and the lower axial inner magnet are overlapped up and down so that their respective inner ring holes are connected; the basin frame is provided with a first air hole relative to the inner ring hole, and the first air hole is connected to the inner ring hole.

[0013] As a preferred solution, the upper axial inner magnet, the middle washer and the lower axial inner magnet all have inner annular holes, the magnetic conductive plate has a second air hole, and the second air hole is connected to the inner annular hole.

[0014] As a preferred solution, the magnetic conductive plate has a sinking groove, which is connected to the second air hole and arranged corresponding to the bottom end surface of the second air hole; and a first tuning net is attached to the inside of the sinking groove.

[0015] As a preferred embodiment, the basin frame includes a first annular wall and a second annular wall connected to each other, a receiving cavity is formed inside the first annular wall, the magnetic circuit assembly is arranged in the receiving cavity, and the upper axial inner magnet, the middle washer and the lower axial inner magnet are all solid structures.

[0016] As a preferred solution, the second annular wall has an outer step portion and an inner step portion, the outer ring portion of the diaphragm is limited by the outer step portion, and the inner step portion is provided with a third air hole.

[0017] As a preferred solution, a plurality of the third air holes are arranged at circumferential intervals along the inner step portion.

[0018] As a preferred solution, a second tuning net is provided on the bottom end surface of the second ring wall corresponding to the third air hole.

[0019] As a preferred embodiment, the upper axial outer magnet has the same magnetic pole as the lower axial outer magnet at one end near the middle radial outer magnet, and the upper axial inner magnet has the same magnetic pole as the lower axial inner magnet at one end near the middle washer; the upper axial outer magnet has opposite magnetic poles to the upper axial inner magnet at one end near the diaphragm, the middle radial outer magnet has opposite magnetic poles to the middle washer at one end near the voice coil, and the upper axial outer magnet at one end near the diaphragm has opposite magnetic poles to the middle radial outer magnet at one end near the voice coil.

[0020] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly uses the structural design of the magnetic circuit component and the design of the washer to replace the radial inner magnetic ring. Without reducing the sensitivity of the speaker, it can solve the problems of the radial inner magnetic ring being small in size and difficult to process, the high processing cost, the radial inner magnetic ring being too small and difficult to fully magnetize, and the washer has a lower cost than the radial inner magnetic ring.

[0021] Alternatively, the upper axial inner magnet, the middle washer and the lower axial inner magnet can be changed from hollow to solid, and the air hole can be moved from the hollow position of the inner magnetic circuit to the inner step of the basin frame. Firstly, the problem of small size and high processing cost of the radial inner magnetic ring and the difficulty in saturation of magnetization due to the small size of the radial inner magnetic ring can be solved. Secondly, the size of the speaker can be made smaller, and the air hole can be moved to the outer ring of the magnetic circuit. The BL performance is better than the opening in the middle of the inner magnetic circuit, so that it can be used in smaller in-ear and clip-on earphone speakers.

[0022] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional diagram of the first embodiment of the utility model;

[0024] Figure 2 It is another three-dimensional diagram of the first embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional view of the first embodiment of the utility model;

[0026] Figure 4 It is an exploded view of the first embodiment of the utility model;

[0027] Figure 5 It is a cross-sectional view of the second embodiment of the utility model;

[0028] Figure 6 It is an exploded view of the second embodiment of the utility model;

[0029] Figure 7 It is a structural diagram of a basin stand according to the second embodiment of the present utility model.

[0030] Description of the accompanying drawings:

[0031] 10. Basin frame 11. First ring wall

[0032] 12. Second annular wall 13. Accommodating cavity

[0033] 14. Third vent hole 15. Solder pad

[0034] 16. Outer step 17. Second tuning net

[0035] 18. Inner step 19. First vent hole

[0036] 20, voice coil 30, diaphragm

[0037] 40. Magnetic circuit assembly 41. Inner ring magnetic circuit

[0038] 42. Outer ring magnetic circuit 43. Annular gap

[0039] 411, upper axial inner magnet 412, middle washer

[0040] 413, lower axial inner magnet 421, upper axial outer magnet

[0041] 422, middle radial outer magnet 423, lower axial outer magnet

[0042] 44. Magnetic plate 441. Second vent hole

[0043] 442. The first tuning net 443. The sink. DETAILED DESCRIPTION

[0044] Please refer to Figures 1 to 7 As shown, it shows the specific structure of various embodiments of the present utility model.

[0045] In the description of the present invention, it should be noted that directional words such as the terms "up", "down", "front", "back", "left", "right", etc., which indicate directions and positional relationships, are based on the directions or positional relationships shown in the drawings or during normal wearing and use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0046] A dual-magnetic-circuit speaker comprises a basin frame 10, a voice coil 20 and a diaphragm 30.

[0047] The basin frame 10 is an open-ended basin frame 10, and the voice coil 20 and the diaphragm 30 are mounted on the basin frame 10; and the second ring wall 12 has an outer step portion 16 and an inner step portion 18, and the outer ring portion of the diaphragm 30 is limited by the outer step portion 16; the diaphragm 30 is connected to the voice coil 20,

[0048] A magnetic circuit assembly 40 is also installed in the basin frame 10, and the magnetic circuit assembly 40 includes an inner ring magnetic circuit 41 and an outer ring magnetic circuit 42; the outer ring magnetic circuit 42 has an outer ring hole, and the outer ring magnetic circuit 42 is sleeved outside the inner ring magnetic circuit 41 through the outer ring hole, and the outer wall of the inner ring magnetic circuit 41 and the inner wall of the outer ring magnetic circuit 42 form an annular gap 43, and the voice coil 20 is at least partially located in the annular gap 43;

[0049] The inner ring magnetic circuit 41 is composed of an upper axial inner magnet 411, a middle washer 412 and a lower axial inner magnet 413; the outer ring magnetic circuit 42 is composed of an upper axial outer magnet 421, a middle radial outer magnet 422 and a lower axial outer magnet 423.

[0050] The upper axial outer magnet 421 has the same magnetic pole as the lower axial outer magnet 423 at one end near the middle radial outer magnet 422, and the upper axial inner magnet 411 has the same magnetic pole as the lower axial inner magnet 413 at one end near the middle washer 412; the upper axial outer magnet 421 has opposite magnetic poles to the upper axial inner magnet 411 at one end near the diaphragm 30, the middle radial outer magnet 422 has opposite magnetic poles to the middle washer 412 at one end near the voice coil 20, and the upper axial outer magnet 421 at one end near the diaphragm 30 has opposite magnetic poles to the middle radial outer magnet 422 at one end near the voice coil 20.

[0051] Preferably, the basin frame 10 further has a soldering pad 15, and the soldering pad 15 is integrally injection-molded with the basin frame 10, thereby saving the process of manually attaching the PCB to the basin frame 10, thereby reducing the production cost of the speaker.

[0052] Preferably, the upper axial inner magnet 411, the middle washer 412 and the lower axial inner magnet 413 all have inner ring holes, and the upper axial inner magnet 411, the middle washer 412 and the lower axial inner magnet 413 are overlapped up and down so that their respective inner ring holes are connected; the basin frame 10 is provided with a first air hole 19 relative to the inner ring hole, and the first air hole 19 is connected to the inner ring hole.

[0053] The magnetic circuit assembly 40 further includes a magnetic conductive plate 44 . The other ends of the outer ring magnetic circuit 42 and the inner ring magnetic circuit 41 away from the diaphragm 30 are located on the magnetic conductive plate 44 . The magnetic conductive plate 44 is installed at the bottom end of the basin frame 10 .

[0054] Preferably, the upper axial inner magnet, the middle washer and the lower axial inner magnet all have inner annular holes, and the magnetic conductive plate has second air holes 441 , which are connected to the inner annular holes.

[0055] Preferably, the magnetic conductive plate 44 has a sinking groove 443 , which is connected to the second air hole and arranged corresponding to the bottom end surface of the second air hole 441 ; and a first tuning net 442 is attached to the inside of the sinking groove 443 .

[0056] like Figures 5 to 7As shown, the basin frame 10 includes a first annular wall 11 and a second annular wall 12 connected to each other, a receiving cavity 13 is formed inside the first annular wall 11, the magnetic circuit assembly 40 is arranged in the receiving cavity 13, the upper axial inner magnet 411, the middle washer 412 and the lower axial inner magnet 413 are all solid structures, the second annular wall 12 has an outer step portion 16 and an inner step portion 18, the outer ring portion of the diaphragm is limited by the outer step portion, and the inner step portion 18 is provided with a third air hole 14.

[0057] Preferably, the third air holes 14 are arranged along the circumferential spacing of the inner step portion 18. Preferably, a plurality of the third air holes 14 are arranged along the circumferential spacing of the inner step portion 18. Preferably, a second tuning net 17 is provided at the bottom end of the second annular wall 12 facing the third air holes 14.

[0058] The third air hole 14 is arranged on the inner step portion 18. Firstly, it can solve the problem that the radial inner magnetic ring is small in size and difficult to process, the processing cost is high, and the radial inner magnetic ring is too small to be magnetized and saturated. Secondly, the size of the speaker can be made smaller. The air hole is moved to the inner step portion 18, and the BL performance is better than the middle opening.

[0059] Among them, although the magnetic performance of a smaller sized radiating ring will decrease, it can be used in smaller headphone speakers. In view of the characteristics of the radiating ring magnetic circuit (it can exceed the performance of ordinary ring magnetic circuits in the same or smaller sizes), it can still be used in smaller in-ear and clip-on headphone speakers. Due to the smaller size of the radiating ring magnetic circuit, when designing the speaker, we can change the sound outlet of the speaker rear cavity from the original center to the outside of the magnetic circuit. At the same time, due to the outward movement of the sound outlet, the original opening on the inner ring magnetic circuit 41 can be omitted, which not only reduces the processing cost of the three internal magnetic parts, but also makes the magnetic field of the internal magnetic circuit stronger by not cutting off the material on the inner hole, so that the speaker can obtain higher magnetic field force and sensitivity.

[0060] The design focus of the utility model is that it mainly uses the structural design of the magnetic circuit component and the design of the washer to replace the radial inner magnetic ring, which can solve the problems of small size and difficult processing of the radial inner magnetic ring, high processing cost, too small radial inner magnetic ring and difficult magnetization without reducing the sensitivity of the speaker, and the washer has a lower cost than the radial inner magnetic ring.

[0061] Alternatively, the upper axial inner magnet, the middle washer and the lower axial inner magnet can be changed from hollow to solid, and the air hole can be moved from the hollow position of the inner magnetic circuit to the inner step of the basin frame. Firstly, the problem of small size and high processing cost of the radial inner magnetic ring and the difficulty in saturation of magnetization due to the small size of the radial inner magnetic ring can be solved. Secondly, the size of the speaker can be made smaller, and the air hole can be moved to the outer ring of the magnetic circuit. The BL performance is better than the opening in the middle of the inner magnetic circuit, so that it can be used in smaller in-ear and clip-on earphone speakers.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A dual-magnetic-circuit speaker, comprising a basin frame, a voice coil and a diaphragm, wherein the voice coil and the diaphragm are mounted on the basin frame; characterized in that: A magnetic circuit assembly is also installed in the basin frame, and the magnetic circuit assembly includes an inner ring magnetic circuit and an outer ring magnetic circuit; the outer ring magnetic circuit has an outer ring hole, and the outer ring magnetic circuit is sleeved outside the inner ring magnetic circuit through the outer ring hole, and the outer wall of the inner ring magnetic circuit and the inner wall of the outer ring magnetic circuit form an annular gap, the voice coil is at least partially located in the annular gap, and the diaphragm is connected to the voice coil; The inner ring magnetic circuit is sequentially formed by stacking an upper axial inner magnet, a middle washer and a lower axial inner magnet; the outer ring magnetic circuit is sequentially formed by stacking an upper axial outer magnet, a middle radial outer magnet and a lower axial outer magnet.

2. A dual magnetic circuit speaker according to claim 1, characterized in that: The magnetic circuit assembly also includes a magnetic conductive plate. One end of the outer ring magnetic circuit and the inner ring magnetic circuit away from the diaphragm is located above the magnetic conductive plate. The magnetic conductive plate is installed at the bottom end of the basin frame.

3. The dual magnetic circuit speaker according to claim 1, characterized in that: The upper axial inner magnet, the middle washer and the lower axial inner magnet all have inner ring holes, and the upper axial inner magnet, the middle washer and the lower axial inner magnet are overlapped up and down so that their respective inner ring holes are connected; the basin frame is provided with a first air hole relative to the inner ring hole, and the first air hole is connected to the inner ring hole.

4. The dual magnetic circuit speaker according to claim 2, characterized in that: The upper axial inner magnet, the middle washer and the lower axial inner magnet all have inner annular holes, the magnetic conductive plate has second air holes, and the second air holes are connected to the inner annular holes.

5. The dual magnetic circuit speaker according to claim 4, characterized in that: The magnetic conductive plate is provided with a sinking groove, which is connected to the second air hole and arranged corresponding to the bottom end surface of the second air hole; and a first tuning net is attached to the inside of the sinking groove.

6. A dual magnetic circuit speaker according to claim 1 or 2, characterized in that: The basin frame includes a first annular wall and a second annular wall connected to each other, a receiving cavity is formed inside the first annular wall, the magnetic circuit component is arranged in the receiving cavity, and the upper axial inner magnet, the middle washer and the lower axial inner magnet are all solid structures.

7. The dual-magnetic-circuit speaker according to claim 6, characterized in that: The second annular wall has an outer step portion and an inner step portion, the outer ring portion of the diaphragm is limited by the outer step portion, and the inner step portion is provided with a third air hole.

8. The dual-magnetic-circuit speaker according to claim 7, characterized in that: A plurality of the third air holes are arranged at circumferential intervals along the inner step portion.

9. The dual-magnetic-circuit speaker according to claim 7, characterized in that: A second tuning net is arranged on the bottom end surface of the second ring wall corresponding to the third air hole.

10. The dual magnetic circuit speaker according to claim 1, characterized in that: The upper axial outer magnet has the same magnetic pole as the lower axial outer magnet at one end near the middle radial outer magnet, and the upper axial inner magnet has the same magnetic pole as the lower axial inner magnet at one end near the middle washer; the upper axial outer magnet has opposite magnetic poles to the upper axial inner magnet at one end near the diaphragm, the middle radial outer magnet has opposite magnetic poles to the middle washer at one end near the voice coil, and the upper axial outer magnet at one end near the diaphragm has opposite magnetic poles to the middle radial outer magnet at one end near the voice coil.

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