Improved magnetic circuit structure suitable for loudspeaker

Abstract

The utility model discloses an improved magnetic circuit structure suitable for a loudspeaker, which comprises a magnetic conductive cover, a main magnet, a T-shaped iron piece and a magnetic conductive plate, an accommodating cavity is formed in the magnetic conductive cover, the main magnet, the T-shaped iron piece and the magnetic conductive plate are respectively embedded in the accommodating cavity, and the magnetic conductive cover is a magnetic leakage prevention piece; the T-shaped iron piece comprises a middle part and an annular connecting part, the main magnet and the concentrating flux plate are arranged on the periphery of the middle part of the T-shaped iron piece in a sleeving mode, the lower surface of the main magnet makes contact with the upper surface of the annular connecting part, and the lower surface of the concentrating flux plate makes contact with the upper surface of the main magnet; an auxiliary magnet is further embedded in the containing cavity of the magnetic conductive cover and located below the T-shaped iron piece, and the upper surface of the auxiliary magnet makes contact with the lower surface of the T-shaped iron piece. A support portion used for installing a diaphragm voice coil is arranged on the edge portion of the upper end of the magnetic conductive cover, and the support portion and the magnetic conductive cover are of an integrated structure. By means of the structural design, the magnetic core has the advantages of being novel in design, simple in structure and high in magnetic gap magnetic flux density.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, and in particular to an improved magnetic circuit structure suitable for loudspeakers. Background Art

[0002] The patent number is: ZL202020277412.0, and the patent name is: A Chinese utility model patent for an electric transducer unit for in-ear headphones. It essentially discloses a loudspeaker magnetic circuit structure. Specifically: The loudspeaker magnetic circuit structure disclosed by the above-mentioned electric transducer unit for in-ear headphones includes an independent sound cavity shell, a magnetic guide magnet, an N52 neodymium magnet, a magnetic guide plate, and a support for fixing the sound membrane voice coil. The independent sound cavity shell is "concave" shaped, one end of the magnetic guide magnet is arranged in the independent sound cavity shell, the N52 neodymium magnet is arranged on the magnetic guide magnet, the support is made of non-magnetic copper alloy, and the independent sound cavity shell is made of non-magnetic copper alloy by stamping.

[0003] It should be pointed out that the support and independent sound cavity shell made of non-magnetic copper alloy material can effectively avoid magnetic leakage.

[0004] However, the loudspeaker magnetic circuit structure disclosed in the above-mentioned electrodynamic transducer unit applied to the in-ear earphone still has the following defects, specifically:

[0005] Defect 1: The support and the independent sound cavity shell are independent structural parts. The support and the independent sound cavity shell of the split structure design will increase the assembly process of the whole product and increase the structural complexity of the whole product;

[0006] Defect 2: The loudspeaker magnetic circuit structure has only one magnet inside, namely, an N52 neodymium magnet. This structure has the problem of low magnetic flux density in the magnetic gap. Utility Model Content

[0007] The utility model aims to provide an improved magnetic circuit structure suitable for a loudspeaker in view of the deficiencies of the prior art. The improved magnetic circuit structure suitable for a loudspeaker has a novel design, a simple structure and a high magnetic gap flux density.

[0008] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0009] An improved magnetic circuit structure suitable for a loudspeaker, comprising a magnetic shield, a main magnet, a T-shaped iron piece, and a magnetic conductive plate, wherein an upwardly opening accommodating cavity is formed inside the magnetic shield, the main magnet, the T-shaped iron piece, and the magnetic conductive plate are respectively embedded in the accommodating cavity of the magnetic shield, and the magnetic shield is a magnetic leakage prevention piece;

[0010] The T-shaped iron piece includes a middle part and an annular connecting part which is arranged at the lower end of the middle part and is in the shape of a circular ring, and the middle part and the annular connecting part are an integral structure; the main magnet and the magnetic conductive plate are respectively mounted on the periphery of the middle part of the T-shaped iron piece, the lower surface of the main magnet is in contact with the upper surface of the annular connecting part, and the lower surface of the magnetic conductive plate is in contact with the upper surface of the main magnet;

[0011] A secondary magnet is also embedded in the accommodating cavity of the magnetic conductive cover. The secondary magnet is located below the T-shaped iron piece, and the upper surface of the secondary magnet is in contact with the lower surface of the T-shaped iron piece.

[0012] The upper edge of the magnetic conductive cover is provided with a bracket part for mounting the diaphragm voice coil, and the bracket part and the magnetic conductive cover are an integrated structure.

[0013] The magnetic conductive cover is provided with a bottom through hole penetrating vertically in the middle position of the bottom of the accommodating cavity, the core of the T-shaped iron piece is provided with a core through hole penetrating vertically completely, and the bottom through hole is aligned with the core through hole.

[0014] The magnetic conductive plate is in a circular ring shape, the outer circumferential surface of the magnetic conductive plate is in contact with the inner wall of the accommodating cavity, and the magnetic conductive plate is fixed to the magnetic conductive cover by glue.

[0015] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0016] 1. The bracket part and the magnetic cover are an integrated structure. This integrated structural design can effectively simplify the overall structure of the speaker and facilitate assembly. Compared with the prior art, the structure of the utility model is simpler and the assembly process is simpler;

[0017] 2. The main magnet contacts the upper surface of the annular connecting part, and the auxiliary magnet contacts the lower surface of the annular connecting part; when in use, the main magnet and the auxiliary magnet can realize magnetic field superposition, and this structural design can effectively improve the magnetic flux density of the magnetic gap;

[0018] 3. Therefore, the utility model has the advantages of novel design, simple structure and high magnetic gap flux density. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] exist Figure 1 Included are:

[0022] 1-magnetic cover; 11-accommodating cavity; 12-bottom through hole; 2-main magnet; 3-T-shaped iron piece; 31-middle part; 32-annular connecting part; 33-core through hole; 4-magnetic plate; 5-auxiliary magnet; 6-bracket part. DETAILED DESCRIPTION

[0023] The present invention will be described below in conjunction with specific implementation methods.

[0024] Embodiment 1, as Figure 1 As shown, an improved magnetic circuit structure suitable for a speaker includes a magnetic shield 1, a main magnet 2, a T-shaped iron piece 3, and a magnetic conductive plate 4. The interior of the magnetic shield 1 is formed with a receiving cavity 11 opening upward. The main magnet 2, the T-shaped iron piece 3, and the magnetic conductive plate 4 are respectively embedded in the receiving cavity 11 of the magnetic shield 1. The magnetic shield 1 is a magnetic leakage-proof component.

[0025] Among them, Figure 1 As shown, the T-shaped iron piece 3 includes a middle portion 31, an annular connecting portion 32 disposed at the lower end of the middle portion 31 and in the shape of a circular ring, and the middle portion 31 and the annular connecting portion 32 are an integral structure; the main magnet 2 and the magnetic conductive plate 4 are respectively mounted on the periphery of the middle portion 31 of the T-shaped iron piece 3, the lower surface of the main magnet 2 is in contact with the upper surface of the annular connecting portion 32, and the lower surface of the magnetic conductive plate 4 is in contact with the upper surface of the main magnet 2. It should be explained that the magnetic conductive plate 4 and the main magnet 2 are respectively arranged at intervals from the middle portion 31 of the T-shaped iron piece 3, and the gap formed by the interval is used for the voice coil part of the diaphragm voice coil to extend into.

[0026] Further, such as Figure 1 As shown, an auxiliary magnet 5 is embedded in the accommodating cavity 11 of the magnetic cover 1 . The auxiliary magnet 5 is located below the T-shaped iron piece 3 , and the upper surface of the auxiliary magnet 5 is in contact with the lower surface of the T-shaped iron piece 3 .

[0027] Furthermore, a bracket portion 6 for mounting the diaphragm voice coil is disposed at the upper edge of the magnetic conductive cover 1 , and the bracket portion 6 and the magnetic conductive cover 1 are an integral structure.

[0028] It should be pointed out that the bracket part 6 and the magnetic conductive cover 1 of the present embodiment 1 are an integrated structure. This integrated structural design can effectively simplify the overall structure of the speaker and facilitate assembly operations. Compared with the prior art, the improved magnetic circuit structure suitable for the speaker of the present embodiment 1 is simpler in structure and the assembly process is simpler.

[0029] In addition, the upper space and the lower space of the annular connecting part 32 of the T-shaped iron piece 3 respectively have a magnet structure, specifically: the main magnet 2 is in contact with the upper surface of the annular connecting part 32, and the auxiliary magnet 5 is in contact with the lower surface of the annular connecting part 32; when in use, the main magnet 2 and the auxiliary magnet 5 can achieve magnetic field superposition, and this structural design can effectively improve the magnetic gap flux density.

[0030] In summary, it can be seen that, through the above structural design, the improved magnetic circuit structure suitable for the speaker of the first embodiment has the advantages of novel design, simple structure and high magnetic gap flux density.

[0031] Embodiment 2, as Figure 1 As shown, the difference between the second embodiment and the first embodiment is that the magnetic cover 1 is provided with a bottom through hole 12 penetrating vertically in the middle position of the bottom of the accommodating cavity 11, and the core of the T-shaped iron piece 3 is provided with a core through hole 33 completely penetrating vertically, and the bottom through hole 12 is aligned with the core through hole 33.

[0032] Embodiment three, as Figure 1 As shown, the difference between the third embodiment and the first embodiment is that the magnetic conductive plate 4 is in a ring shape, the outer circumferential surface of the magnetic conductive plate 4 is in contact with the inner wall of the accommodating cavity 11, and the magnetic conductive plate 4 is fixed to the magnetic conductive cover 1 by glue.

[0033] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. An improved magnetic circuit structure suitable for a loudspeaker, comprising a magnetic shield (1), a main magnet (2), a T-shaped iron piece (3), and a magnetic conductive plate (4); the magnetic shield (1) is internally formed with a receiving cavity (11) opening upward; the main magnet (2), the T-shaped iron piece (3), and the magnetic conductive plate (4) are respectively embedded in the receiving cavity (11) of the magnetic shield (1); and the magnetic shield (1) is a magnetic leakage prevention component; The T-shaped iron piece (3) comprises a middle part (31) and an annular connecting part (32) arranged at the lower end of the middle part (31) and in the shape of a circular ring, wherein the middle part (31) and the annular connecting part (32) are an integral structure; the main magnet (2) and the magnetic conductive plate (4) are respectively mounted on the periphery of the middle part (31) of the T-shaped iron piece (3), the lower surface of the main magnet (2) is in contact with the upper surface of the annular connecting part (32), and the lower surface of the magnetic conductive plate (4) is in contact with the upper surface of the main magnet (2); Features: An auxiliary magnet (5) is also embedded in the accommodating cavity (11) of the magnetic conductive cover (1), and the auxiliary magnet (5) is located below the T-shaped iron piece (3), and the upper surface of the auxiliary magnet (5) is in contact with the lower surface of the T-shaped iron piece (3); The upper edge of the magnetic conductive cover (1) is provided with a bracket portion (6) for mounting a diaphragm voice coil, and the bracket portion (6) and the magnetic conductive cover (1) are an integrated structure.

2. The improved magnetic circuit structure suitable for a speaker according to claim 1, characterized in that: The magnetic conductive cover (1) is provided with a bottom through hole (12) penetrating vertically at the middle position of the bottom of the accommodating cavity (11), and the core of the T-shaped iron piece (3) is provided with a core through hole (33) penetrating vertically completely, and the bottom through hole (12) and the core through hole (33) are arranged in alignment.

3. The improved magnetic circuit structure suitable for a speaker according to claim 1, characterized in that: The magnetic conductive plate (4) is in the shape of a ring, the outer circumferential surface of the magnetic conductive plate (4) is in contact with the inner wall of the accommodating cavity (11), and the magnetic conductive plate (4) is fixed to the magnetic conductive cover (1) by glue.

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