Speaker magnetic circuit structure, speaker and design method of speaker magnetic circuit structure

Abstract

The present invention discloses a loudspeaker magnetic circuit structure, a loudspeaker and a design method of the loudspeaker magnetic circuit structure. The loudspeaker magnetic circuit structure includes: a magnet; a magnetic conductive lower plate; a magnetic conductive upper plate, which forms a magnetic gap with the magnetic conductive lower plate; a voice coil disposed in the magnetic gap; the change of the magnetic gap width of the magnetic gap is set according to the change of the magnetic field strength in the magnetic gap, so that the magnetic field strength of the upper part of the voice coil is symmetrical with the magnetic field strength of the lower part of the voice coil. By setting the magnetic gap width according to the change of the magnetic field strength in the magnetic gap, the magnetic field strength of the upper part of the voice coil can be made symmetrical with the magnetic field strength of the lower part of the voice coil, so that the Ampere force received by the voice coil when moving upward is the same as the Ampere force received by the voice coil when moving downward, making the vibration of the voice coil symmetrical and improving the fidelity effect of the sound effect, effectively solving the problem of sound distortion existing in the existing loudspeaker.

Description

Technical Field

[0001] The present invention relates to the field of loudspeakers, and more particularly to a magnetic circuit structure of a loudspeaker, a loudspeaker and a design method of the magnetic circuit structure of the loudspeaker. Background Art

[0002] In the existing loudspeaker magnetic circuit, there is generally a problem of uneven magnetic field intensity in the magnetic gap, which will cause the Ampere force received by the voice coil when moving upward to be inconsistent with the Ampere force received when moving downward, resulting in asymmetry when the voice coil vibrates up and down, and causing distortion of the loudspeaker. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a magnetic circuit structure of a loudspeaker, which can solve the problem of uneven magnetic field intensity in the magnetic gap of the existing loudspeaker magnetic circuit.

[0004] The present invention also provides a loudspeaker and a design method of the magnetic circuit structure of the loudspeaker.

[0005] According to an embodiment of the first aspect of the present invention, the magnetic circuit structure of the loudspeaker includes:

[0006] A magnet;

[0007] A magnetic conductive lower plate;

[0008] A magnetic conductive upper plate, forming a magnetic gap with the magnetic conductive lower plate;

[0009] A voice coil disposed in the magnetic gap; the magnetic gap width of the magnetic gap changes according to the change of the magnetic field intensity in the magnetic gap, so that the magnetic field intensity of the upper part of the voice coil is symmetrical with the magnetic field intensity of the lower part of the voice coil.

[0010] According to the embodiment of the present invention, the magnetic circuit structure of the loudspeaker has at least the following beneficial effects:

[0011] In the magnetic circuit structure of the loudspeaker according to the embodiment of the present invention, the magnetic gap width of the magnetic gap changes according to the change of the magnetic field intensity in the magnetic gap, so that the magnetic field intensity of the upper part of the voice coil is symmetrical with the magnetic field intensity of the lower part of the voice coil, the Ampere force received by the voice coil when moving upward is the same as the Ampere force received when moving downward, the voice coil vibrates symmetrically, the fidelity of the sound effect is improved, and the problem of sound distortion of the existing loudspeaker is effectively solved.

[0012] According to some embodiments of the present invention, the magnetic conductive lower plate adopts a T-shaped magnetic conductive lower plate, and the T-shaped magnetic conductive lower plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure; a through hole is provided at the center of the magnetic conductive upper plate, and the magnetic conductive upper plate is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet is arranged between the lower surface of the magnetic conductive upper plate and the plate-shaped structure, and a magnetic gap is formed between the magnetic conductive upper plate and the columnar structure.

[0013] According to some embodiments of the present invention, the lower edge of the magnetic conductive upper plate close to the voice coil side is chamfered.

[0014] According to some embodiments of the present invention, the magnetic conductive upper plate is an annular magnetic conductive plate.

[0015] According to some embodiments of the present invention, the magnet is an annular magnet, and the annular magnet is sleeved on the columnar structure and is located between the lower surface of the magnetic conductive upper plate and the plate-shaped structure.

[0016] The loudspeaker according to the second aspect embodiment of the present invention includes the loudspeaker magnetic circuit structure as described above. Since the loudspeaker adopts all the technical solutions of the loudspeaker magnetic circuit structure of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments.

[0017] According to the design method of the loudspeaker magnetic circuit structure of the third aspect embodiment of the present invention, the loudspeaker magnetic circuit structure includes a magnetic conductive lower plate, a magnetic conductive upper plate, a magnet and a voice coil; a magnetic gap is formed between the magnetic conductive upper plate and the magnetic conductive lower plate; the voice coil is arranged in the magnetic gap;

[0018] The design method includes the following steps:

[0019] Obtain the magnetic field intensity data in the magnetic gap;

[0020] Determine the change in the magnetic gap width of the magnetic gap according to the change in the magnetic field intensity data;

[0021] Adjust the edge shape of the area of the magnetic conductive upper plate and / or the edge shape of the area of the magnetic conductive lower plate that form the magnetic gap according to the change in the magnetic gap width, so that the magnetic field intensity of the upper part of the voice coil is symmetrical with the magnetic field intensity of the lower part of the voice coil.

[0022] The design method of the loudspeaker magnetic circuit structure according to the embodiment of the present invention has at least the following beneficial effects:

[0023] The design method of the speaker magnetic circuit structure according to the embodiment of the present invention sets the magnetic gap width according to the change of the magnetic field strength in the magnetic gap, so that the magnetic field strength of the upper part of the voice coil is symmetric with the magnetic field strength of the lower part of the voice coil, so that the Ampere force received by the voice coil when moving upward is the same as the Ampere force received when moving downward, so that the voice coil vibrates symmetrically, improving the fidelity effect of the sound effect and effectively solving the problem of sound distortion existing in the existing speaker.

[0024] According to some embodiments of the present invention, determining the change of the magnetic gap width of the magnetic gap according to the change of the magnetic field strength data includes the following steps:

[0025] Set the change of the magnetic gap width according to the magnetic field strength, wherein the magnetic gap width is larger at the position where the magnetic field strength is higher.

[0026] According to some embodiments of the present invention, the magnetic conductive lower plate adopts a T-shaped magnetic conductive lower plate, and the T-shaped magnetic conductive lower plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure; a through hole is provided in the center of the magnetic conductive upper plate, and the magnetic conductive upper plate is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet is arranged between the lower surface of the magnetic conductive upper plate and the plate-shaped structure, and the magnetic gap is formed between the magnetic conductive upper plate and the columnar structure.

[0027] According to some embodiments of the present invention, the lower edge of the magnetic conductive upper plate close to the voice coil is chamfered.

[0028] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. Description of the Drawings

[0029] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0030] Figure 1 is a schematic structural diagram of the speaker magnetic circuit structure according to an embodiment of the present invention (the edge shape of the magnetic conductive upper plate is not adjusted);

[0031] Figure 2 is a schematic structural diagram of the speaker magnetic circuit structure according to an embodiment of the present invention (the edge shape of the magnetic conductive upper plate has been adjusted);

[0032] Figure 3 is a magnetic field strength distribution diagram of the speaker magnetic circuit structure according to an embodiment of the present invention when the edge shape of the magnetic conductive upper plate is not adjusted;

[0033] Figure 4It is a magnetic field intensity distribution diagram when the edge shape of the magnetic conductive upper plate of the loudspeaker magnetic circuit structure according to an embodiment of the present invention has been adjusted;

[0034] Figure 5 It is a process flow chart of a design method for a loudspeaker magnetic circuit structure according to an embodiment of the present invention.

[0035] Reference numerals:

[0036] Magnet 100,

[0037] Magnetic conductive lower plate 200,

[0038] Magnetic conductive upper plate 300,

[0039] Voice coil 400. Specific embodiments

[0040] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0041] In the description of the present invention, if the first, second, etc. are described, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0042] In the description of the present invention, it should be understood that the orientation descriptions such as up, down, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the following described embodiments are some but not all embodiments of the present invention.

[0045] See Figure 1 as shown Figure 1 It is a loudspeaker magnetic circuit structure provided by an embodiment of the present invention. The loudspeaker magnetic circuit structure includes a magnet 100, a magnetic conductive lower plate 200, a magnetic conductive upper plate 300, and a voice coil 400;

[0046] Magnet 100;

[0047] Magnetic conductive lower plate 200;

[0048] Magnetic conductive upper plate 300, forming a magnetic gap with the magnetic conductive lower plate 200;

[0049] Voice coil 400, arranged in the magnetic gap; the change of the magnetic gap width of the magnetic gap is set according to the change of the magnetic field strength in the magnetic gap, so that the magnetic field strength of the upper part of the voice coil 400 is symmetrical with the magnetic field strength of the lower part of the voice coil 400.

[0050] Reference Figure 1 , a magnetic gap is formed between the magnetic conductive upper plate 300 and the magnetic conductive lower plate 200, and the voice coil 400 is arranged in the magnetic gap along the length direction of the magnetic gap. At this time, both the upper half and the lower half of the voice coil 400 will be affected by the magnetic field. If the distance between the side of the magnetic conductive upper plate 300 close to the voice coil 400 and the magnetic conductive lower plate 200 remains unchanged, it can be detected that the magnetic field strength information of the voice coil 400 along the length direction of the magnetic gap is as Figure 3 shown, Figure 3 in which the origin of the abscissa represents Figure 1 the highest point of the voice coil 400 in Figure 3 , the abscissa represents the length information of the voice coil 400 from top to bottom, the unit is millimeter mm, and the ordinate is the magnetic field strength information corresponding to each position in the voice coil 400, the unit is Tesla Tesla. It can be seen from

[0051] Reference Figure 2 , after detecting the magnetic field strength information in the magnetic gap, the width of the magnetic gap can be adaptively adjusted according to the change of the magnetic field strength along the length of the voice coil 400, so that the magnetic field strength of the upper half and the lower half of the voice coil 400 can be symmetrical, as Figure 4 shown. The meanings of the abscissa and the ordinate in the figure are the same as those in Figure 3 . It can be seen that the magnetic fields of the upper half and the lower half of the voice coil 400 have been symmetrical. It should be noted that when the magnetic field strength at a certain place in the magnetic gap is too large, the magnetic field strength can be reduced by increasing the magnetic gap width at that place. On the contrary, when the magnetic field strength at a certain place in the magnetic gap is too small, the magnetic field strength can also be increased by reducing the magnetic gap width at that place.

[0052] In the magnetic circuit structure of the loudspeaker according to the embodiment of the present invention, the edge shape of the upper magnetic conductive plate 300 close to the voice coil 400 is set according to the change of the magnetic field strength in the magnetic gap, so that the magnetic field strength of the upper part of the voice coil 400 can be symmetrical with the magnetic field strength of the lower part of the voice coil 400, so that the Ampere force received by the voice coil 400 when moving upward is the same as the Ampere force received when moving downward, so that the vibration of the voice coil 400 is symmetrical, improving the fidelity effect of the sound effect, and effectively solving the problem of sound distortion existing in the existing loudspeaker.

[0053] Reference Figure 1 、 Figure 2 In some embodiments, the lower magnetic conductive plate 200 is a T-shaped lower magnetic conductive plate, and the T-shaped lower magnetic conductive plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure; a through hole is provided in the center of the upper magnetic conductive plate 300, and the upper magnetic conductive plate 300 is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet 100 is arranged between the lower surface of the upper magnetic conductive plate 300 and the plate-shaped structure, and a magnetic gap is formed between the upper magnetic conductive plate 300 and the columnar structure. This kind of magnetic circuit structure is relatively simple and can meet the requirements of loudspeaker use.

[0054] Reference Figure 2 In some embodiments, the lower edge of the upper magnetic conductive plate 300 close to the voice coil 400 is chamfered. Through actual detection data, it shows that in most cases, there is a problem that the magnetic field strength of the lower half of the voice coil 400 is higher than that of the upper half. Therefore, by setting the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400 to be chamfered, most of the distortion problems can be effectively solved. It should be noted that the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400 can also be set to be chamfered, or the lower edge of the upper magnetic conductive plate 300 close to the voice coil 400 and the lower magnetic conductive plate 200 close to the voice coil 400 are adjusted at the same time, and the magnetic gap width is adjusted to the required width to obtain the required magnetic field strength.

[0055] Reference Figure 1 、 Figure 2 In some embodiments, the upper magnetic conductive plate 300 is an annular magnetic conductive plate. The magnet 100 is an annular magnet, and the annular magnet is sleeved on the columnar structure and is located between the lower surface of the upper magnetic conductive plate 300 and the plate-shaped structure. Adopting the annular structure can make the magnetic field distribution in the whole loudspeaker easier to predict, facilitate simulation, and is also more convenient for processing when actually producing loudspeakers.

[0056] The embodiment of the present invention also provides a loudspeaker, and the loudspeaker includes the loudspeaker magnetic circuit structure as described above. Since the loudspeaker adopts all the technical solutions of the loudspeaker magnetic circuit structure of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0057] SeeFigure 5 As shown Figure 5 is a process flow diagram of a design method for a speaker magnetic circuit structure provided by an embodiment of the present invention. The speaker magnetic circuit structure includes a magnetic conductive lower plate 200, a magnetic conductive upper plate 300, a magnet 100, and a voice coil 400; a magnetic gap is formed between the magnetic conductive upper plate 300 and the magnetic conductive lower plate 200; the voice coil 400 is disposed in the magnetic gap;

[0058] The design method includes the following steps:

[0059] Obtain the magnetic field strength data in the magnetic gap;

[0060] Determine the change in the magnetic gap width of the magnetic gap according to the magnetic field strength data;

[0061] Adjust the edge shape of the region of the magnetic conductive upper plate 300 and / or the edge shape of the region of the magnetic conductive lower plate 200 forming the magnetic gap according to the change in the magnetic gap width, so that the magnetic field strength of the upper part of the voice coil 400 is symmetric with the magnetic field strength of the lower part of the voice coil 400.

[0062] Refer to Figure 1 , in order to better describe the design method of the speaker magnetic circuit structure of the embodiment of the present invention, the speaker magnetic circuit structure is introduced here first. A magnetic gap is formed between the magnetic conductive upper plate 300 and the magnetic conductive lower plate 200, and the voice coil 400 is disposed in the magnetic gap along the length direction of the magnetic gap. At this time, both the upper half and the lower half of the voice coil 400 are affected by the magnetic field. If the distance between the side of the magnetic conductive upper plate 300 close to the voice coil 400 and the magnetic conductive lower plate 200 remains unchanged, then it can be detected that the magnetic field strength information of the voice coil 400 along the length direction of the magnetic gap, such as Figure 3 As shown Figure 3 the origin of the abscissa in represents Figure 1 the highest point of the voice coil 400 in, the abscissa represents the length information of the voice coil 400 from top to bottom, and the ordinate is the magnetic field strength information corresponding to each position in the voice coil 400. It can be seen from Figure 3 that the magnetic field strength between the upper half and the lower half of the voice coil 400 is asymmetric, which will cause the forces received by the voice coil 400 during up and down movement to be asymmetric, resulting in sound distortion.

[0063] Based on the above speaker magnetic circuit structure, the design method of the speaker magnetic circuit structure of the embodiment of the present invention is described here.

[0064] First, obtain the magnetic field strength data in the magnetic gap (for example Figure 3As shown, after determining the magnetic field strength data, taking the middle of the voice coil 400 as the central axis, compare to both sides to determine whether the magnetic field strength is symmetric. If there is an asymmetric position, it is necessary to adjust the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400 on the corresponding side to make the magnetic field strength symmetric. It should be noted that when adjusting the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400, the higher the adjustment accuracy, the better the symmetry of the adjusted magnetic field strength.

[0065] Specifically, Figure 3 、 Figure 4 As shown, Figure 3 in the right side of [Figure], the magnetic field strength is higher than that on the left side. Therefore, it is necessary to reduce the magnetic field strength on the right side or increase the magnetic field strength on the left side to make the magnetic field strength symmetric. Specifically, how much to adjust the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400 is determined according to the magnetic field strength of the area to be adjusted. The width change between the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and the edge of the lower magnetic conductive plate 200 close to the voice coil 400 determined according to the magnetic field strength can be recorded as the magnetic gap width change. Subsequently, only need to complete the processing of the upper magnetic conductive plate 300 and / or the lower magnetic conductive plate 200 in the speaker according to the magnetic gap width change. As Figure 3 、 Figure 4 As shown, in this embodiment, the adjustment of the magnetic field strength is completed by changing the shape of the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400. Similarly, the adjustment of the magnetic field strength can also be completed by changing the shape of the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400, or the adjustment of the magnetic field strength can be completed by adjusting the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400 and the lower edge of the lower magnetic conductive plate 200 close to the voice coil 400 at the same time.

[0066] It should be noted that in some embodiments, the magnetic field strength data in the magnetic gap is not directly obtained by actual measurement, and can also be obtained by simulating the magnetic circuit structure of the speaker with a simulation tool. Then, continuously adjust the shape of the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400 in the simulation tool according to the magnetic field strength information in the magnetic gap obtained by the simulation tool until the magnetic gap strength in the simulation tool meets the requirement of preventing distortion. At this time, the edge shape of the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400 obtained by the simulation tool can be regarded as the target edge shape. Subsequently, only need to use this target edge shape to complete the processing of the upper magnetic conductive plate 300 in the speaker.

[0067] The design method of the speaker magnetic circuit structure according to the embodiment of the present invention sets the edge shape of the upper magnetic conductive plate 300 close to the voice coil 400 according to the change of the magnetic field intensity in the magnetic gap, so that the magnetic field intensity of the upper part of the voice coil 400 is symmetrical with the magnetic field intensity of the lower part of the voice coil 400, so that the Ampere force received by the voice coil 400 when moving upward is the same as the Ampere force received when moving downward, so that the vibration of the voice coil 400 is symmetrical, improving the fidelity effect of the sound effect, and effectively solving the problem of sound distortion existing in the existing speaker.

[0068] In some embodiments, determining the change of the magnetic gap width of the magnetic gap according to the change of the magnetic field intensity data includes the following steps:

[0069] Set the change of the magnetic gap width according to the magnetic field intensity, where the magnetic gap width is larger at the position with higher magnetic field intensity.

[0070] The principle of setting the change of the magnetic gap width according to the magnetic field intensity is relatively simple. Usually, it is only necessary to increase the magnetic gap width between the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and the edge of the lower magnetic conductive plate 200 close to the voice coil 400 in the area with large magnetic field intensity, or only need to adjust and reduce the magnetic gap width between the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and the edge of the lower magnetic conductive plate 200 close to the voice coil 400 in the area with small magnetic field intensity. For the means of adjusting the magnetic gap width, the upper magnetic conductive plate 300 and the lower magnetic conductive plate 200 on both sides of the magnetic gap can be directly cut or thickened on the upper magnetic conductive plate 300 and the lower magnetic conductive plate 200 on both sides of the magnetic gap. In some embodiments, only the method of increasing the magnetic gap by cutting or the like is required.

[0071] Reference Figure 1 、 Figure 2 , in some embodiments, the lower magnetic conductive plate 200 adopts a T-shaped lower magnetic conductive plate, and the T-shaped lower magnetic conductive plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure; a through hole is provided in the center of the upper magnetic conductive plate 300, and the upper magnetic conductive plate 300 is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet 100 is arranged between the lower surface of the upper magnetic conductive plate 300 and the plate-shaped structure, and a magnetic gap is formed between the upper magnetic conductive plate 300 and the columnar structure. This kind of magnetic circuit structure is relatively simple and is sufficient to meet the requirements of speaker use.

[0072] Reference Figure 2, in some embodiments, the lower edge of the magnetic conductive upper plate 300 on the side close to the voice coil 400 is chamfered. Actual test data shows that in most cases, there is a problem that the magnetic field intensity of the lower half of the voice coil 400 is higher than that of the upper half. Therefore, by chamfering the lower edge of the magnetic conductive lower plate 200 on the side close to the voice coil 400, most distortion problems can be effectively solved. It should be noted that the lower edge of the magnetic conductive lower plate 200 on the side close to the voice coil 400 can also be chamfered, or the lower edge of the magnetic conductive upper plate 300 on the side close to the voice coil 400 and the side of the magnetic conductive lower plate 200 close to the voice coil 400 can be adjusted simultaneously to adjust the magnetic gap width to the required width to obtain the required magnetic field intensity.

[0073] To better illustrate the design method of the speaker magnetic circuit structure of the embodiments of the present invention, it will be described in the form of specific embodiments here.

[0074] Here, a brief description of the speaker magnetic circuit structure applying the design method of the embodiments of the present invention will be given first.

[0075] As Figure 1 shown, the speaker magnetic circuit structure includes a T-shaped magnetic conductive lower plate, a magnetic conductive upper plate 300, a magnet 100, and a voice coil 400; the T-shaped magnetic conductive lower plate includes a plate-like structure and a columnar structure located on the upper surface of the plate-like structure; a through hole is provided in the center of the magnetic conductive upper plate 300, and the magnetic conductive upper plate 300 is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-like structure; the magnet 100 is arranged between the lower surface of the magnetic conductive upper plate 300 and the plate-like structure, and a magnetic gap is formed between the magnetic conductive upper plate 300 and the columnar structure. At this time, the magnetic field intensity distribution in the magnetic gap can be referred to Figure 3 shown.

[0076] Next, a brief description of the design method of the speaker magnetic circuit structure of the embodiments of the present invention will be given.

[0077] Figure 3 The magnetic field intensity on the right side in

[0078] In this specific embodiment, the change in the magnetic gap width is determined according to the change in the magnetic field strength in the magnetic gap, and the adjustment of the edge of the upper magnetic conductive plate 300 close to the voice coil 400 and / or the edge of the lower magnetic conductive plate 200 close to the voice coil 400 is completed according to the change in the magnetic gap width, so that the magnetic field strength of the upper part of the voice coil 400 is symmetric with the magnetic field strength of the lower part of the voice coil 400, so that the Ampere force received by the voice coil 400 when moving upward is the same as the Ampere force received when moving downward, so that the vibration of the voice coil 400 is symmetric, improving the fidelity effect of the sound effect and effectively solving the problem of sound distortion existing in the existing loudspeaker.

[0079] The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A loudspeaker magnetic circuit structure, characterized in that, it includes: a magnet; a magnetic conductive lower plate, the magnetic conductive lower plate adopts a T-shaped magnetic conductive lower plate, and the T-shaped magnetic conductive lower plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure; a magnetic conductive upper plate, a magnetic gap is formed between the magnetic conductive upper plate and the columnar structure, a through hole is provided in the center of the magnetic conductive upper plate, the magnetic conductive upper plate is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet is arranged between the lower surface of the magnetic conductive upper plate and the plate-shaped structure; a voice coil, arranged in the magnetic gap, the lower edge of the magnetic conductive lower plate close to the voice coil is chamfered, through cutting or thickening treatment, the edge shape of the magnetic conductive upper plate close to the voice coil is set according to the change of the magnetic field strength in the magnetic gap; the change of the magnetic gap width of the magnetic gap is set according to the change of the magnetic field strength in the magnetic gap, so that the magnetic field strength of the upper part of the voice coil is symmetrical with the magnetic field strength of the lower part of the voice coil.

2. The loudspeaker magnetic circuit structure according to claim 1, characterized in that, the lower edge of the magnetic conductive upper plate close to the voice coil is chamfered.

3. The loudspeaker magnetic circuit structure according to claim 1, characterized in that, the magnetic conductive upper plate is an annular magnetic conductive plate.

4. The loudspeaker magnetic circuit structure according to claim 1, characterized in that, the magnet is an annular magnet, and the annular magnet is sleeved on the columnar structure and is located between the lower surface of the magnetic conductive upper plate and the plate-shaped structure.

5. A loudspeaker, characterized in that, it includes the loudspeaker magnetic circuit structure according to any one of claims 1 to 4.

6. A design method of a loudspeaker magnetic circuit structure, characterized in that, the loudspeaker magnetic circuit structure includes a magnetic conductive lower plate, a magnetic conductive upper plate, a magnet and a voice coil; the magnetic conductive lower plate adopts a T-shaped magnetic conductive lower plate, and the T-shaped magnetic conductive lower plate includes a plate-shaped structure and a columnar structure located on the upper surface of the plate-shaped structure, a magnetic gap is formed between the magnetic conductive upper plate and the columnar structure, a through hole is provided in the center of the magnetic conductive upper plate, the magnetic conductive upper plate is sleeved on the columnar structure through the through hole and is arranged parallel to the plate-shaped structure; the magnet is arranged between the lower surface of the magnetic conductive upper plate and the plate-shaped structure; the voice coil is arranged in the magnetic gap, the lower edge of the magnetic conductive lower plate close to the voice coil is chamfered, through cutting or thickening treatment, the edge shape of the magnetic conductive upper plate close to the voice coil is set according to the change of the magnetic field strength in the magnetic gap; the design method includes the following steps: acquiring the magnetic field strength data in the magnetic gap; determining the change of the magnetic gap width of the magnetic gap according to the change of the magnetic field strength data; adjusting and forming the edge shape of the magnetic conductive upper plate area and / or the edge shape of the magnetic conductive lower plate area of the magnetic gap according to the change of the magnetic gap width, so that the magnetic field strength of the upper part of the voice coil is symmetrical with the magnetic field strength of the lower part of the voice coil.

7. The design method of the loudspeaker magnetic circuit structure according to claim 6, characterized in that, the determining the change of the magnetic gap width of the magnetic gap according to the change of the magnetic field strength data includes the following steps: Set the change of the magnetic gap width according to the magnetic field strength, wherein the magnetic gap width is larger at the position with higher magnetic field strength.

8. The design method of the loudspeaker magnetic circuit structure according to claim 6, characterized in that, the lower edge of the magnetic conductive upper plate close to the voice coil side is chamfered.

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