Magnetic loop device and loudspeaker

Abstract

The utility model relates to a magnetic circuit device and a loudspeaker, and the magnetic circuit device comprises a first magnetic conductive column 6, a first short circuit ring 5 which is sleeved with the first magnetic conductive column 6, a magnet 3 which is sleeved with the first magnetic conductive column 6 and the first short circuit ring 5, a second magnetic conductive column 4 which is arranged above the first magnetic conductive column 6, and a second short circuit ring 1 which is sleeved with the second magnetic conductive column 4. And the washer 2 is sleeved with the second magnetic conductive column 4. A first sleeving concave platform 61 is arranged at the upper end of the first magnetic conductive column 6; and the first short circuit ring 5 is sleeved with the first magnetic conductive column 6 at the first sleeving concave platform 61. A second sleeving concave platform 41 is arranged at the upper end of the second magnetic conductive column 4; and the second short circuit ring 1 is sleeved with the second magnetic conductive column 4 at the second sleeving concave platform 41. The beneficial effects of the utility model lie in that: 1, second and third harmonic distortion is effectively reduced; the structure is simple, and assembling is convenient;

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, in particular to a magnetic return device and a loudspeaker. Background Art

[0002] For high-end home theater speakers, customers hope to improve the harmonic distortion produced by the traditional speaker magnetic return system to provide more optimized audio-visual effects.

[0003] Distortion caused by the nonlinearity of the magnet occurs in two situations. One is that at low frequencies and large amplitudes, the relative position of the voice coil to the magnetic gap changes greatly, causing the average magnetic permeability of the magnetic material to change, affecting the voice coil inductance and causing current distortion. The other is distortion caused by the magnetic permeability of the magnetic material itself that constitutes the magnetic circuit. For speakers, permanent magnets form a large DC magnetic field similar to a bias, while the magnetic field change caused by the audio current is quite small. This AC magnetic field change will form a small hysteresis loop, resulting in audio current distortion. Audio current distortion will vary depending on where the magnetic flux passes. The third harmonic distortion is dominant near the magnetic columns and magnetic plates around the voice coil, while the second harmonic distortion is dominant through the magnetic flux of the magnet itself. In order to reduce this type of distortion, the current traditional method is to use good magnetic materials to reduce distortion, but the effect is not good enough.

[0004] Therefore, it is urgent to develop a magnetic return device that can effectively reduce the second and third harmonic distortion. Utility Model Content

[0005] The utility model aims to solve one of the above technical problems at least to a certain extent.

[0006] Therefore, the first object of the present invention is to provide a magnetic return device to effectively reduce the second and third harmonic distortions.

[0007] The second objective of the present invention is to provide a loudspeaker.

[0008] To achieve the above-mentioned objectives, the first aspect of the embodiment of the utility model discloses a magnetic return device, including a first magnetic conductive column 6, a first short-circuit ring 5 mounted on the first magnetic conductive column 6, a magnet 3 mounted on the first magnetic conductive column 6 and the first short-circuit ring 5, a second magnetic conductive column 4 arranged above the first magnetic conductive column 6, a second short-circuit ring 1 mounted on the second magnetic conductive column 4, and a washer 2 mounted on the second magnetic conductive column 4.

[0009] In addition, the magnetic return device according to the above technical solution of the utility model may also have the following additional technical features:

[0010] Optionally, a first mounting recess 61 is provided at the upper end of the first magnetic conductive column 6 , and the first short-circuit ring 5 is mounted on the first magnetic conductive column 6 at the first mounting recess 61 .

[0011] Optionally, a second mounting recess 41 is provided at the upper end of the second magnetic conductive column 4 , and the second short-circuit ring 1 is mounted on the second magnetic conductive column 4 at the second mounting recess 41 .

[0012] Optionally, a circular annular boss 62 is provided at the middle upper end of the first magnetic conductive column 6, and the first set recess 61 is arranged at the upper end of the circular annular boss.

[0013] Optionally, a bottom end of the first magnetic conductive column 6 is provided with a bottom plate 63, and the magnet 3 is arranged on an upper end of the bottom plate.

[0014] Optionally, the upper end surface of the annular boss 62 is provided with a notch, and the lower end surface of the second magnetic conductive column 4 is provided with a protrusion matching the notch.

[0015] To achieve the above-mentioned purpose, a second embodiment of the present invention discloses a loudspeaker, including a magnetic return device of the first embodiment.

[0016] The beneficial effects of the utility model are: 1. effectively reducing the second and third harmonic distortions; 2. simple structure and convenient assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of a magnetic return device provided by an embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a magnetic return device provided by another embodiment of the utility model;

[0019] Figure 3 is an AA cross-sectional view of a magnetic return device provided by another embodiment of the utility model;

[0020] Figure 4 It is a three-dimensional diagram of a magnetic return device provided by another embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of a speaker provided by another embodiment of the utility model.

[0022] Reference numerals:

[0023] 1-second short-circuit ring, 2-washer, 3-magnet, 4-second magnetic conductive column, 41-second set concave platform, 5-first short-circuit ring, 6-first magnetic conductive column, 61-first set concave platform, 62-annular boss, 63-chassis. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or components / elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The magnetic return device according to the embodiment of the utility model is described below with reference to the accompanying drawings.

[0026] Figure 1 This is an exploded view of a magnetic return device provided by an embodiment of the utility model. Figure 2 is a structural schematic diagram of a magnetic return device provided by another embodiment of the utility model, Figure 3 is an AA cross-sectional view of a magnetic return device provided by another embodiment of the utility model, Figure 4 FIG. 1 is a three-dimensional diagram of a magnetic return device provided by another embodiment of the present utility model. Figure 1-4 As shown, the magnetic return device includes: a first magnetic conductive column 6, a first short-circuit ring 5 mounted on the first magnetic conductive column 6, a magnet 3 mounted on the first magnetic conductive column 6 and the first short-circuit ring 5, a second magnetic conductive column 4 arranged above the first magnetic conductive column 6, a second short-circuit ring 1 mounted on the second magnetic conductive column 4, and a washer 2 mounted on the second magnetic conductive column 4.

[0027] Specifically, the magnetic return device provided in the embodiment of the present application has a simple structure, and the assembly can be completed by only assembling the first short-circuit ring 5, the magnet 3, the second magnetic pole 4, the second short-circuit ring 1 and the washer 2 one by one starting from the first magnetic pole 6. The magnetic return device of the present application splits the magnetic pole into the first magnetic pole 6 and the second magnetic pole 4, wherein an aluminum short-circuit ring is installed on the pole diameter of the first magnetic pole 6 to replace the short-circuit ring on the inner diameter of the magnet to reduce the second harmonic distortion of the speaker; and an aluminum short-circuit ring is fixed on the second magnetic pole 4 to reduce the third harmonic distortion of the speaker.

[0028] It should be noted that the short-circuit ring can be made of copper or aluminum; since the short-circuit effect makes the inductance of the voice coil close to zero, the short-circuit ring reduces the nonlinear inductance change of the magnetic material and also reduces distortion.

[0029] According to the magnetic return device of the utility model, the magnetic conductive column is split into the first magnetic conductive column 6 and the second magnetic conductive column 4, which can effectively reduce the harmonic distortion of the speaker.

[0030] According to an embodiment of the present invention, a first mounting recess 61 is disposed at the upper end of the first magnetic conductive column 6 , and the first short-circuit ring 5 is mounted on the first magnetic conductive column 6 at the first mounting recess 61 .

[0031] Specifically, the first set recessed platform 61 is used as the short-circuit ring bonding position. It is arranged at the upper end to facilitate installation from top to bottom, and is designed as a concave recessed platform, so that the outer diameter end surfaces of the first magnetic conductive column 6 and the first short-circuit ring 5 can be flat after installation.

[0032] According to an embodiment of the present invention, a second mounting recess 41 is disposed at the upper end of the second magnetic conductive column 4 , and the second short-circuit ring 1 is mounted on the second magnetic conductive column 4 at the second mounting recess 41 .

[0033] Specifically, similar to the previous embodiment, the second mounting recess 41 facilitates the installation of the short-circuit ring and makes the outer diameter end surface of the second magnetic conductive column 4 and the second short-circuit ring 1 flat after mounting.

[0034] According to an embodiment of the present invention, a circular annular boss 62 is provided at the middle upper end of the first magnetic conductive column 6 , and the first set recess 61 is provided at the upper end of the circular annular boss 62 .

[0035] According to an embodiment of the present invention, a bottom end of the first magnetic conductive column 6 is provided with a bottom plate 63, and the magnet 3 is arranged at the upper end of the bottom plate.

[0036] Specifically, the first magnetic conductive column 6 can be designed as a combination of an annular boss 62 and a chassis 63. A short-circuit ring is installed on the annular boss 62, and the chassis 63 is used as a platform to place the magnet 3. When the washer 2 is installed later, the washer is placed on the upper end surface of the magnet 3, so that when the magnetic return device of the present application is installed, all components have a fixed end surface to bear, will not slide, and make installation convenient.

[0037] According to an embodiment of the utility model, the upper end surface of the annular boss 62 is provided with a notch, and the lower end surface of the second magnetic conductive column 4 is provided with a protrusion matching with the notch.

[0038] Specifically, the second magnetic conductive column 4 and the first magnetic conductive column 6 are installed by matching the notch and the protrusion, so that no sliding occurs during installation, and the installation is convenient.

[0039] Based on the above embodiments, the embodiments of the present application further provide a speaker, Figure 5 is a structural schematic diagram of a speaker provided by another embodiment of the utility model, such as Figure 5 As shown, it includes: a magnetic return device as described in the above embodiment.

[0040] Specifically, Figure 5 As shown, the speaker can be arranged above the magnetic return device of the first aspect embodiment of the present application.

[0041] According to the loudspeaker of the utility model, the magnetic return device splits the magnetic column into the first magnetic column 6 and the second magnetic column 4, which can effectively reduce the harmonic distortion of the loudspeaker; and the structure is simple and the installation is convenient.

[0042] The above embodiments are preferred implementation schemes of the present application. In addition, the present application may also be implemented in other ways. Any obvious replacement without departing from the concept of the present application is within the protection scope of the present application.

Claims

1. A magnetic return device, characterized in that: include: A first magnetic conductive column (6), a first short-circuit ring (5) mounted on the first magnetic conductive column (6), a magnet (3) mounted on the first magnetic conductive column (6) and the first short-circuit ring (5), a second magnetic conductive column (4) arranged above the first magnetic conductive column (6), a second short-circuit ring (1) mounted on the second magnetic conductive column (4), and a washer (2) mounted on the second magnetic conductive column (4).

2. A magnetic return device according to claim 1, characterized in that: A first mounting recess (61) is provided at the upper end of the first magnetic conductive column (6), and the first short-circuit ring (5) is mounted on the first magnetic conductive column (6) at the first mounting recess (61).

3. A magnetic return device according to claim 1, characterized in that: A second mounting recess (41) is provided at the upper end of the second magnetic conductive column (4), and the second short-circuit ring (1) is mounted on the second magnetic conductive column (4) at the second mounting recess (41).

4. A magnetic return device according to claim 2, characterized in that: A circular annular boss (62) is provided at the middle upper end of the first magnetic conductive column (6), and the first set recess (61) is arranged at the upper end of the circular annular boss.

5. A magnetic return device according to claim 4, characterized in that: A bottom end of the first magnetic conductive column (6) is provided with a bottom plate (63), and the magnet (3) is arranged at the top end of the bottom plate.

6. A magnetic return device according to claim 4, characterized in that: The upper end surface of the annular boss (62) is provided with a notch, and the lower end surface of the second magnetic conductive column (4) is provided with a protrusion that matches the notch.

7. A loudspeaker, characterized in that: It comprises a magnetic return device as described in any one of claims 1-6.

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