Magnetic circuit structure for reducing nonlinear distortion of loudspeaker

Abstract

The utility model discloses a magnetic circuit structure for reducing nonlinear distortion of a loudspeaker, which comprises a voice coil, and a first magnetic conductive piece, a second magnetic conductive piece, a first short circuit ring and a second short circuit ring are arranged in the voice coil. The first magnetic conductive piece is arranged above the second magnetic conductive piece, the first short circuit ring is arranged between the first magnetic conductive piece and the voice coil, and the second short circuit ring is arranged between the second magnetic conductive piece and the voice coil. According to the utility model, by adopting the first magnetic conductive piece and the second magnetic conductive piece which are arranged up and down and the first short circuit ring and the second short circuit ring, magnetic leakage is relatively symmetrical, a magnetic field structure close to full symmetry is generated, the effects that the inductance value is greatly reduced and the curve of the inductor is straighter along with the displacement change are realized, the linear range of the BL and the inductor is increased, and the reliability of the inductor is improved. And therefore, the three-time distortion of the product is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to a magnetic circuit structure for reducing nonlinear distortion in loudspeakers. Background Technology

[0002] Nonlinear distortion in loudspeakers refers to the presence of additional components in the reproduced sound signal that are not present in the electrical signal. These components can be categorized into harmonic distortion, subharmonic distortion, and modulation distortion. Harmonic distortion has the greatest impact. Harmonic distortion includes even-order and odd-order harmonic distortion. Even-order harmonic distortion is primarily second-order, while odd-order harmonic distortion is primarily third-order. According to auditory psychology and actual hearing experience, the human ear can tolerate a significant amount of second-order harmonic distortion but finds it difficult to tolerate the same amount of third-order harmonic distortion. One of the main sources of third-order harmonic distortion is insufficient linear range of the drive system.

[0003] Traditional methods for reducing loudspeaker nonlinear distortion and increasing the linearity of the drive system mainly fall into two categories: increasing the winding length of the voice coil and significantly increasing the height of the center magnetic post. However, the first method has the following problems: because the voice coil is closer to the magnetic base plate, the maximum displacement of the drive system is reduced, lowering power; the increased coil weight reduces sensitivity; and the increased inductance reduces high-frequency output. The second method has the following problems: increased leakage flux reduces the magnetic flux density in the magnetic circuit gap, lowering sensitivity; the longer magnetic post increases the voice coil inductance, reducing high-frequency output; and the linear range of the inductance is still relatively small—the inductance decreases significantly when the voice coil is upward and increases dramatically when it is downward, causing significant fluctuations in coil current with displacement and resulting in distortion. Utility Model Content

[0004] The purpose of this invention is to provide a magnetic circuit structure that reduces nonlinear distortion in loudspeakers, thereby solving the problems mentioned in the background section. To achieve the above objective, this invention provides the following technical solution:

[0005] A magnetic circuit structure for reducing nonlinear distortion in a loudspeaker includes a voice coil, within which are disposed a first magnetic conductor, a second magnetic conductor, a first short-circuit ring, and a second short-circuit ring; the first magnetic conductor is disposed above the second magnetic conductor, the first short-circuit ring is disposed between the first magnetic conductor and the voice coil, and the second short-circuit ring is disposed between the second magnetic conductor and the voice coil.

[0006] Furthermore, the first magnetic conductor has a step on the side facing the voice coil, the first short-circuit ring is disposed on the step, and the second short-circuit ring is disposed below the step.

[0007] Furthermore, the outer diameter of the first magnetic conductive element is larger than the outer diameter of the second magnetic conductive element, and the step protrudes from the outside of the second magnetic conductive element.

[0008] Furthermore, the longitudinal thickness of the second magnetic conductive element is greater than that of the first magnetic conductive element.

[0009] Furthermore, the magnetic circuit structure also includes an upper magnetic guide plate, which is disposed outside the voice coil.

[0010] Furthermore, the magnetic circuit structure also includes a magnetically conductive base plate, which is disposed at the bottom of the magnetic circuit structure.

[0011] The beneficial effects of this utility model are as follows: By adopting a first magnetic conductive element and a second magnetic conductive element, a first short-circuit ring and a second short-circuit ring arranged vertically, the leakage magnetic field is relatively symmetrical, resulting in a nearly fully symmetrical magnetic field structure. This achieves a significant reduction in inductance and a flatter inductance-displacement curve, increases the linear range of BL and inductance, and leads to a significant reduction in the third distortion of the product. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 Enlarged schematic diagram of section D in the middle.

[0015] Figure 3 This is a schematic diagram of the magnetic circuit structure of a traditional single short-circuit ring.

[0016] Figure 4 This is a schematic diagram of the inductance displacement curve of the magnetic circuit structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the BL curve of the magnetic circuit structure of this utility model.

[0018] Figure 6 This is a schematic diagram of the relative value curve of harmonic distortion of the magnetic circuit structure of this utility model.

[0019] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] like Figure 1 and Figure 2 As shown, a magnetic circuit structure for reducing nonlinear distortion in a loudspeaker includes a voice coil 1. The voice coil 1 contains a first magnetic conductor 2, a second magnetic conductor 3, a first short-circuit ring 4, and a second short-circuit ring 5. The first magnetic conductor 2 is positioned above the second magnetic conductor 3. The longitudinal thickness of the second magnetic conductor 3 is greater than that of the first magnetic conductor 2, and the second magnetic conductor 3 has a columnar magnetic structure. Compared to a conventional central magnetic conductor structure, the first magnetic conductor 2 and the second magnetic conductor 3 of this application are essentially split in two from the upper part of the conventional central magnetic conductor structure. The first short-circuit ring 4 is positioned between the first magnetic conductor 2 and the voice coil 1, and the second short-circuit ring is positioned between the second magnetic conductor 3 and the voice coil 1. It should be noted that, similar to conventional magnetic circuit structures, the magnetic circuit structure of this application also includes an upper magnetic conductor plate 6 and a magnetic conductor base plate 7. The upper magnetic conductor plate 6 is positioned outside the voice coil 1, and the magnetic conductor base plate 7 is positioned at the bottom of the magnetic circuit structure, with the magnetic conductor base plate 7 integrally connected to the second magnetic conductor 3.

[0028] The design principle of the magnetic circuit structure in this application is as follows: by dividing the traditional integrated central magnetic column into two, it is improved by setting a first magnetic component 2 and a second magnetic component 3 vertically; thus, a structural change is achieved by setting a first short-circuit ring 4 and a second short-circuit ring 5 on the upper and lower sides of the central magnetic column, excluding the working gap of the magnetic circuit. Simultaneously, since both the upper and lower short-circuit rings are close to the voice coil 1, they function as the secondary coil of the voice coil 1, and their short-circuit effect is excellent, thereby reducing the inductance of the voice coil 1. Furthermore, due to the structural arrangement of these upper and lower short-circuit rings, the contact surface between the short-circuit rings and the voice coil 1 changes very little when the voice coil 1 moves up and down, thus achieving not only a significant reduction in inductance but also a flatter curve for the inductance change with displacement.

[0029] like Figure 3 As shown, a conventional magnetic circuit structure reduces inductance by adding a separate short-circuit ring C in the gap between the inner wall of magnet A and the outer wall of voice coil B. A comparison of the inductance displacement curves of this conventional magnetic circuit structure and the magnetic circuit structure of this application is shown below. Figure 4 As shown: Figure 4 The red dashed curve at the top is the inductance displacement curve of a traditional magnetic circuit structure, with an inductance of 0.549mH at its highest point. Figure 4 The blue solid curve below is the inductance displacement curve of the magnetic circuit structure for reducing nonlinear distortion of loudspeakers in this application. Its maximum inductance is 0.326mH and the inductance changes relatively slowly with displacement. Figure 4The red dashed curve below is a comparison curve after the inductance of the traditional magnetic circuit structure is reduced by 0.223mH.

[0030] In the specific implementation process of this application, if Figure 2 As shown, a step 21 is provided on the side of the first magnetic conductor 2 facing the voice coil 1. The step 21 protrudes beyond the outer side of the second magnetic conductor 3, making the outer diameter of the first magnetic conductor 2 larger than the outer diameter of the second magnetic conductor 3. The design of the step 21 helps to more accurately position the short-circuit ring and optimize the magnetic field control effect. The first short-circuit ring 4 is located on the step 21, and the second short-circuit ring is located below the step 21.

[0031] Because the outer diameter of the first magnetic conductor 2 above the magnetic circuit gap is larger than the outer diameter of the second magnetic conductor 3 below, the magnetic field is more concentrated in the working gap portion of the magnetic circuit. Simultaneously, the step 21 on the first magnetic conductor 2 and the second magnetic conductor 3, which has a smaller outer diameter than the first magnetic conductor 2, achieve symmetry in the upper and lower structures of the central magnetic conductor near the magnetic circuit gap, resulting in relatively symmetrical magnetic leakage. This generates a nearly fully symmetrical magnetic field structure, achieving... Figure 5 The flat BL curve is shown by the solid blue curve. See also Figure 5 , Figure 5 The solid blue curve represents the BL curve of the magnetic circuit structure in this patent. Figure 5 The red dashed curve in the middle is the BL curve with the same voice coil 1 length and the same magnetic circuit gap size.

[0032] At the same time, due to the increased linear range of BL and inductance, the third-order distortion of the product is significantly reduced. See [link / reference needed]. Figure 6 .

[0033] It should also be noted that, without conflict, the embodiments of this utility model and the features therein can be combined with each other to obtain new embodiments.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. The scope of protection of the present utility model should be determined by the scope of the claims. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A magnetic circuit structure for reducing nonlinear distortion in a loudspeaker, comprising a voice coil (1), characterized in that, The inner side of the voice coil (1) is provided with a first magnetic conductor (2), a second magnetic conductor (3), a first short-circuit ring (4), and a second short-circuit ring (5); the first magnetic conductor (2) is disposed above the second magnetic conductor (3), the first short-circuit ring (4) is disposed between the first magnetic conductor (2) and the voice coil (1), and the second short-circuit ring is disposed between the second magnetic conductor (3) and the voice coil (1).

2. The magnetic circuit structure for reducing loudspeaker nonlinear distortion according to claim 1, characterized in that, The first magnetic conductor (2) has a step (21) on the side facing the voice coil (1), the first short-circuit ring (4) is disposed on the step (21), and the second short circuit is disposed below the step (21).

3. The magnetic circuit structure for reducing loudspeaker nonlinear distortion according to claim 2, characterized in that, The outer diameter of the first magnetic conductive element (2) is larger than the outer diameter of the second magnetic conductive element (3), and the step (21) protrudes out of the outer side of the second magnetic conductive element (3).

4. The magnetic circuit structure for reducing loudspeaker nonlinear distortion according to claim 1, characterized in that, The longitudinal thickness of the second magnetic conductor (3) is greater than that of the first magnetic conductor (2).

5. The magnetic circuit structure for reducing nonlinear distortion of a loudspeaker according to claim 1, characterized in that, The magnetic circuit structure also includes an upper magnetic guide plate (6), which is disposed outside the voice coil (1).

6. The magnetic circuit structure for reducing nonlinear distortion in loudspeakers according to claim 1, characterized in that, The magnetic circuit structure also includes a magnetically conductive base plate (7), which is disposed at the bottom of the magnetic circuit structure.

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