Horn structure for improving magnetic field intensity

Abstract

The utility model discloses a horn structure capable of improving magnetic field intensity, which comprises a U iron and a magnetic circuit assembly, and is characterized in that the U iron is a cavity with an opening at the upper end; the magnetic circuit assembly comprises an iron column arranged on the bottom wall of the cavity, a first magnet arranged on the upper wall of the iron column, a first washer arranged on the upper wall of the first magnet, a second magnet arranged on the upper wall of the first washer and a second washer arranged on the upper wall of the second magnet; a first magnetic circuit gap is formed between the first magnet and the inner wall of the U-shaped iron; and a second magnetic circuit gap is formed between the second magnet and the inner wall of the U-shaped iron. Compared with the prior art, the second washer is mainly added, so that the direction of a magnetic field is controllable, a uniform magnetic field is provided for the voice coil (the magnetic field intensity is improved), the sensitivity of the voice coil is improved, the low-frequency tone quality is effectively improved, and acoustic distortion is reduced. And meanwhile, a double-magnet structure is adopted, so that the bass sound quality and the treble sound quality can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of loudspeakers, in particular to a loudspeaker structure capable of improving magnetic field strength. Background Art

[0002] A speaker is an electroacoustic device that can convert electrical signals into sound and is an important device in the sound system. The working principle of a paper cone speaker is that when an audio current passes through a voice coil in a magnetic field, a magnetic field that changes with the audio current is generated. This magnetic field interacts with the magnetic field of the permanent magnet, causing the voice coil to vibrate along the axial direction and produce sound. The paper cone speaker has a simple structure, full bass, soft sound quality, and a wide frequency band, but has low efficiency.

[0003] In order to improve the sound quality of existing speakers, the general method is to increase the thickness of the magnet (and thus increase the magnetic field strength), thereby improving the sound quality of the speaker; however, in actual products, the thicker the magnet, the larger the diameter of its magnetic field, and the area where the voice coil and the magnetic circuit are tangent moves outward, so the volume of the corresponding speaker also increases; at the same time, the production cost also increases (the cost of the magnet and the assembly cost. The larger the magnetic circuit gap, the higher the axial alignment requirement between the magnetic circuit gap and the voice coil).

[0004] For example, Chinese patent CN202311537066.X, in order to increase the magnetic field strength, sets up a radial magnetic circuit component, thereby increasing the magnetic field strength. Correspondingly, the structure is also more complicated, and the production cost is also increased accordingly. Utility Model Content

[0005] The main purpose of the utility model is to propose a speaker structure with improved magnetic field strength, aiming to improve the structure of the speaker, by increasing the magnetic field strength, thereby increasing the operating frequency between the magnetic circuit component and the voice coil, making the structure simple, convenient to assemble, and effectively improving the acoustic sound quality.

[0006] To achieve the above object, the utility model provides a speaker structure for improving magnetic field strength, comprising:

[0007] U-iron, wherein the U-iron is a cavity with an opening at the upper end;

[0008] A magnetic circuit assembly, the magnetic circuit assembly comprising an iron column arranged on the bottom wall of the cavity, a first magnet arranged on the upper wall of the iron column, a first washer arranged on the upper wall of the first magnet, a second magnet arranged on the upper wall of the first washer, and a second washer arranged on the upper wall of the second magnet;

[0009] A first magnetic circuit gap is formed between the first magnet and the inner wall of the U iron;

[0010] A second magnetic circuit gap is formed between the second magnet and the inner wall of the U iron.

[0011] The magnetic circuit assembly forms the first magnetic circuit and the second magnetic circuit with the first magnet and the second magnet through the magnetic conduction of the U iron, the iron column, the first washer and the second washer, wherein the voice coil is located between the first magnetic circuit gap and the second magnetic circuit gap, which not only ensures the balance of the magnetic field, but also avoids the outward movement of the magnetic circuit gap, while improving the magnetic field strength. Compared with the existing design, it mainly adds the second washer, thereby making the magnetic field direction controllable, providing a uniform magnetic field to the voice coil (and increasing the magnetic field strength), thereby improving the sensitivity of the voice coil, effectively improving the low-frequency sound quality, and reducing acoustic distortion.

[0012] At the same time, the dual magnet structure can also effectively improve the bass and treble sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a half-section schematic diagram of the utility model;

[0014] Figure 2 It is a cross-sectional view of the utility model;

[0015] Figure 3 It is a three-dimensional schematic diagram of the utility model;

[0016] Figure 4 It is the BL value test chart;

[0017] Figure 5 Magnetic flux density model Figure 1 ;

[0018] Figure 6 Magnetic flux density model Figure 2 ;

[0019] Figure 7 It is the magnetic flux contour distribution diagram.

[0020] In the figure,

[0021] 1 is U iron, 10 is opening, 11 is step groove,

[0022] 2 is a magnetic circuit assembly, 20 is an iron column, 21 is a first magnet, 22 is a second magnet, 23 is a first washer, 24 is a second washer,

[0023] 31 is the first magnetic circuit gap, 32 is the second magnetic circuit gap,

[0024] 4 is the voice coil,

[0025] 5 is the skeleton,

[0026] 6 is the eardrum. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] like Figures 1 to 3 As shown, a speaker structure for improving magnetic field strength includes:

[0031] U-iron 1, the U-iron 1 is a cavity with an opening 10 at the upper end;

[0032] A magnetic circuit assembly 2, the magnetic circuit assembly 2 comprising an iron column 20 disposed on the bottom wall of the cavity, a first magnet 21 disposed on the upper wall of the iron column 20, a first washer 23 disposed on the upper wall of the first magnet 21, a second magnet 22 disposed on the upper wall of the first washer 23, and a second washer 24 disposed on the upper wall of the second magnet 22;

[0033] A first magnetic circuit gap 31 is formed between the first magnet 21 and the inner wall of the U iron 1;

[0034] A second magnetic circuit gap 32 is formed between the second magnet 22 and the inner wall of the U iron 1 .

[0035] The magnetic circuit assembly 2 forms a first magnetic circuit and a second magnetic circuit with the first magnet 21 and the second magnet 22 through the magnetic conduction of the U iron 1, the iron column 20, the first washer 23 and the second washer 24 (see Figure 7), wherein the voice coil 4 is located between the first magnetic circuit gap 31 and the second magnetic circuit gap 32, which not only ensures the balance of the magnetic field, but also avoids the outward movement of the magnetic circuit gap, and at the same time improves the magnetic field strength. Compared with the existing design, it mainly adds a second washer 24, so that the direction of the magnetic field can be controlled, providing a uniform magnetic field to the voice coil 4 (and increasing the magnetic field strength), thereby improving the sensitivity of the voice coil 4, effectively improving the low-frequency sound quality, and reducing acoustic distortion.

[0036] At the same time, the dual magnet structure can also effectively improve the bass and treble sound quality.

[0037] Specifically, the thickness of the second washer 24 is 0.5 mm to 1.5 mm. Figure 4 The middle is a BL value test chart of the speaker after adding the second washer 24, where the bottom line segments upwards are test charts without the second washer 24, 0.5mm second washer 24, 1.0mm second washer 24 and 1.5mm second washer 24, where BL values ​​are high and low pitch values, and the larger the BL value, the stronger the magnetic field strength; Figure 4 The embodiment clearly shows that the BL value increases from 4.96 to 5.12 from no second washer 24 to 1.5mm second washer 24. BL is the product of the magnetic field strength B (Tesla) of the coil magnetic gap and the length (meter) of the voice coil 4 wire. It reflects the electromagnetic characteristics of the unit. The QTS of modern units is relatively low, and BL is mainly used to control QES, obtain a smaller QES, and obtain ideal damping and transient (which can be understood as the amplitude and frequency of the sound film).

[0038] In the embodiment of the utility model, the upper wall surface of the second magnet 22 is flush with the lower wall surface of the second magnet 22, thereby achieving magnetic conductivity of the second magnetic field.

[0039] Specifically, the iron column 20, the first magnet 21, the first washer 23, the second magnet 22 and the second washer 24 are coaxially arranged and bonded together by glue.

[0040] In the embodiment of the utility model, the diameter of the first washer 23 is larger than the diameter of the first magnet 21 and the second magnet 22. Specifically, the diameters of the first magnet 21 and the second magnet 22 are the same. The intersection area between the first magnetic field and the second magnetic field is expanded to reduce the mutual influence between the magnetic fields, so that the magnetic field distribution is more uniform; Figure 5 , Figure 6 , Figure 7 shown.

[0041] In the embodiment of the utility model, a voice coil 4 is provided between the first magnetic circuit gap and the second magnetic circuit gap, and the voice coil 4 extends from the middle of the first magnet 21 to the middle of the second magnet 22 .

[0042] Specifically, the thickness of the second washer 24 is smaller than the thickness of the first washer 23. In the existing design, the speaker can work without adding the second washer 24, but the magnetic field distribution uniformity and magnetic field diameter are larger.

[0043] In the embodiment of the utility model, the upper end of the U iron 1 is provided with a stepped groove 11, and the stepped groove 11 is provided with a frame 5;

[0044] Specifically, the upper end of the voice coil 4 is connected to the eardrum 6, and the eardrum extends to the upper end of the skeleton 5, thereby forming a relatively closed vibration chamber between the skeleton and the eardrum.

[0045] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A speaker structure for improving magnetic field strength, characterized in that: include: U-iron, wherein the U-iron is a cavity with an opening at the upper end; A magnetic circuit assembly, the magnetic circuit assembly comprising an iron column arranged on the bottom wall of the cavity, a first magnet arranged on the upper wall of the iron column, a first washer arranged on the upper wall of the first magnet, a second magnet arranged on the upper wall of the first washer, and a second washer arranged on the upper wall of the second magnet; A first magnetic circuit gap is formed between the first magnet and the inner wall of the U iron; A second magnetic circuit gap is formed between the second magnet and the inner wall of the U iron.

2. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The thickness of the second washer is 0.5 mm-1.5 mm.

3. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The upper wall surface of the second magnet is flush with the lower wall surface of the second magnet.

4. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The iron column, the first magnet, the first washer, the second magnet and the second washer are coaxially arranged and bonded together by glue.

5. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The diameter of the first washer is greater than the diameters of the first magnet and the second magnet.

6. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The first magnet and the second magnet have the same diameter.

7. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: A voice coil is provided between the first magnetic circuit gap and the second magnetic circuit gap, and the voice coil extends from the middle of the first magnet to the middle of the second magnet.

8. The speaker structure for improving magnetic field strength according to claim 1, characterized in that: The thickness of the second washer is smaller than the thickness of the first washer.

9. The speaker structure for improving magnetic field strength according to claim 7, characterized in that: The upper end of the U iron is provided with a step groove, and the step groove is provided with a frame.

10. The speaker structure for improving magnetic field strength according to claim 9, characterized in that: The upper end of the voice coil is connected to the eardrum, and the eardrum extends to the upper end of the frame.

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