Magnetic circuit structure and loudspeaker

Abstract

The utility model belongs to the technical field of loudspeakers, and discloses a magnetic circuit structure and a loudspeaker. The magnetic circuit structure comprises a magnetic bowl, a magnet, a main magnetic conductive sheet and an auxiliary magnetic conductive sheet, a containing groove is formed in the magnetic bowl, a groove is formed in the side wall of the containing groove, the magnet and the main magnetic conductive sheet are both arranged in the containing groove, the main magnetic conductive sheet is stacked on the magnet, a first magnetic gap is defined by the magnet and the bottom wall of the groove, and a second magnetic gap is defined by the main magnetic conductive sheet and the side wall of the containing groove. The second magnetic gap is communicated with the first magnetic gap. Under the action of the magnetic field force, the voice coil penetrates through the first magnetic gap and the second magnetic gap in a position-adjustable manner. The distance between the outer end of the auxiliary magnetic conductive sheet and the voice coil is larger than the distance between the outer end of the main magnetic conductive sheet and the voice coil, namely, the outer end of the auxiliary magnetic conductive sheet is not aligned with the outer end of the main magnetic conductive sheet. Through the arrangement of the auxiliary magnetic conductive sheet and the groove, the distribution of magnetic induction lines can be changed, the effects of improving the symmetry of a B1 (x) curve and optimizing the harmonic distortion of the loudspeaker are achieved, and the tone quality of the loudspeaker is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to loudspeaker technical field especially relates to a magnetic circuit structure and loudspeaker. BACKGROUND

[0002] Modern people are busy at work, and listening to music is a relatively common leisure way. The quality of the loudspeaker can directly affect people's experience. After the voice coil of the loudspeaker is electrified, the alternating current is subjected to the action of Lorentz force in the magnetic field, drives the diaphragm to vibrate, makes the diaphragm push the air vibration and generates the sound, when the voice coil moves up and down the same displacement x, the closer the Bl value is, the lower the harmonic distortion of the loudspeaker is, and the better the sound quality is.

[0003] And in the prior art magnetic circuit structure, the center magnetic circuit and the edge magnet or the magnetic bowl are mostly designed as the same height and regular shape. Due to the limitation of the magnetic circuit structure, the voice coil position may not be at the balance position, thereby causing the phenomenon that the Bl (x) curve is asymmetric, and the sound quality effect is poor. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of magnetic circuit structure and loudspeaker, the magnetic circuit structure can effectively improve the symmetry of Bl (x) curve, reduce harmonic distortion, improve sound quality effect.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a magnetic circuit structure is provided, comprising:

[0007] A magnetic bowl is provided with a receiving groove, and a groove is formed in the side wall of the receiving groove.

[0008] A magnet is arranged in the receiving groove, and the magnet and the bottom wall of the groove are surrounded by a first magnetic gap.

[0009] A main magnetic sheet is stacked on the magnet and located in the receiving groove. A second magnetic gap is formed between the main magnetic sheet and the side wall of the receiving groove, and the second magnetic gap is connected to the first magnetic gap. Under the action of the magnetic field force, the voice coil position is adjustably arranged in the first magnetic gap and the second magnetic gap.

[0010] A secondary magnetic sheet is stacked on the main magnetic sheet, and the distance between the outer end of the secondary magnetic sheet and the voice coil is greater than the distance between the outer end of the main magnetic sheet and the voice coil.

[0011] As an optional solution of the magnetic circuit structure, a boss is arranged on the end face of the main magnetic sheet facing the magnet, and the boss abuts against the magnet.

[0012] As an optional solution of the magnetic circuit structure, the outer end face of the boss is flush with the outer end face of the magnet.

[0013] As an optional scheme of the magnetic circuit structure, the depth of the groove is 1-2mm.

[0014] As an optional scheme of the magnetic circuit structure, the horizontal distance between the outer end of the auxiliary magnetic conducting sheet and the outer end of the magnet is at least 1mm.

[0015] As an optional scheme of the magnetic circuit structure, the distance between the outer end of the main magnetic conducting sheet and the voice coil is less than the distance between the outer end of the magnet and the voice coil.

[0016] As an optional scheme of the magnetic circuit structure, a chamfer is arranged on the main magnetic conducting sheet.

[0017] As an optional scheme of the magnetic circuit structure, a chamfer is arranged on the outer side of the top of the magnetic bowl.

[0018] In another aspect, a loudspeaker is provided, comprising the magnetic circuit structure as described above.

[0019] As an optional scheme of the loudspeaker, the voice coil is a long voice coil or a short voice coil.

[0020] The beneficial effects of the present application are as follows:

[0021] The present application provides a magnetic circuit structure, by arranging a groove on the side wall of the accommodating groove on the magnetic bowl and stacking an auxiliary magnetic conducting sheet on the main magnetic conducting sheet, the magnetic circuit structure is optimized, the magnetic induction line distribution of the magnetic circuit structure is changed, and then the stress distribution of the voice coil in the first magnetic gap and the second magnetic gap is changed, the effect of improving the symmetry of the Bl(x) curve and optimizing the harmonic distortion of the loudspeaker is achieved, and the sound quality of the loudspeaker is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a cross-sectional view of the magnetic circuit structure provided by the embodiment of the specific implementation manner of the present application;

[0023] Figure 2 is a Bl(x) curve diagram of the magnetic circuit structure in the prior art;

[0024] Figure 3 is a Bl(x) curve diagram of the magnetic circuit structure provided by the embodiment of the specific implementation manner of the present application.

[0025] In the drawings:

[0026] 100, voice coil;

[0027] 1, magnetic bowl; 11, groove; 12, chamfer;

[0028] 2, magnet; 21, first magnetic gap;

[0029] 3, main magnetic conducting sheet; 31, second magnetic gap; 32, boss; 33, chamfer;

[0030] 4. The auxiliary flux guide. DETAILED DESCRIPTION

[0031] The utility model will be described in further detail below in connection with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the utility model and not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description, not all the structures.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the embodiment, the terms "upper", "lower", "right", etc. The orientation or position relationship shown in the drawing is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0035] The technical scheme of the utility model will be further described below in connection with the drawings and through specific embodiments.

[0036] The Bl value is the product of the magnetic gap flux density B and the wire length I of the voice coil 100 located in the magnetic gap, and the Bl(x) curve is used to characterize the property of the force coefficient Bl value of the loudspeaker with the position change of the voice coil 100 located in the magnetic gap. As shown in the figure, Figure 2As shown, the Bl(x) curve of the traditional magnetic circuit structure in the prior art, the horizontal coordinate is the vibration distance of the voice coil 100, and the vertical coordinate is the Bl value. There is obvious asymmetry. The asymmetry of the Bl(x) curve indicates that the force received by the voice coil 100 in the magnetic gap is asymmetrical when the voice coil 100 vibrates up and down, which eventually leads to harmonic distortion of the loudspeaker and reduces the sound quality of the loudspeaker.

[0037] As shown in the prior art, the Bl(x) curve of the traditional magnetic circuit structure, the horizontal coordinate is the vibration distance of the voice coil 100, and the vertical coordinate is the Bl value. There is obvious asymmetry. The asymmetry of the Bl(x) curve indicates that the force received by the voice coil 100 in the magnetic gap is asymmetrical when the voice coil 100 vibrates up and down, which eventually leads to harmonic distortion of the loudspeaker and reduces the sound quality of the loudspeaker. Figure 1 As shown, the present embodiment provides a magnetic circuit structure, comprising a magnetic bowl 1, a magnet 2, a main magnetic sheet 3 and a secondary magnetic sheet 4. The magnetic bowl 1 is provided with a receiving groove, and the side wall of the receiving groove is provided with a groove 11. The magnet 2 and the main magnetic sheet 3 are arranged in the receiving groove, and the main magnetic sheet 3 is arranged on the magnet 2. The magnet 2 and the bottom wall of the groove 11 surround a first magnetic gap 21, and the main magnetic sheet 3 and the side wall of the receiving groove surround a second magnetic gap 31. The second magnetic gap 31 is communicated with the first magnetic gap 21. Under the action of the magnetic field force, the voice coil 100 is adjustably arranged in the first magnetic gap 21 and the second magnetic gap 31. The secondary magnetic sheet 4 is arranged on the main magnetic sheet 3, and the distance between the outer end of the secondary magnetic sheet 4 and the voice coil 100 is greater than the distance between the outer end of the main magnetic sheet 3 and the voice coil 100, i.e. the outer end of the secondary magnetic sheet 4 is not aligned with the outer end of the main magnetic sheet 3. In combination with Figure 3 As shown, the Bl(x) curve of the magnetic circuit structure provided by the present embodiment has good symmetry. The arrangement of the secondary magnetic sheet 4 and the groove 11 can change the magnetic induction line distribution of the magnetic circuit structure, and further change the force distribution of the voice coil 100 in the first magnetic gap 21 and the second magnetic gap 31, so as to improve the symmetry of the Bl(x) curve, optimize the harmonic distortion of the loudspeaker, and improve the sound quality of the loudspeaker.

[0038] Optionally, the distance between the outer end of the main magnetic sheet 3 and the voice coil 100 is less than the distance between the outer end of the magnet 2 and the voice coil 100, i.e. the outer end of the main magnetic sheet 3 protrudes from the outer end of the magnet 2, so as to ensure the uniform force distribution of the voice coil 100 between the first magnetic gap 21 and the second magnetic gap 31.

[0039] Optionally, the end face of the main magnetic sheet 3 facing the magnet 2 is provided with a boss 32, and the boss 32 abuts against the magnet 2. The arrangement of the boss 32 can further improve the distribution of the magnetic induction line and optimize the force distribution of the voice coil 100.

[0040] Further, the outer end face of the boss 32 is flush with the outer end face of the magnet 2, so as to further optimize the force distribution of the voice coil 100 and ensure the symmetry of the Bl(x) curve.

[0041] Optionally, the depth of the groove 11 is 1-2 mm, so as to ensure the uniform force of the voice coil 100 and improve the sound quality of the loudspeaker.

[0042] Optionally, the horizontal distance between the outer end of the auxiliary magnetic conducting sheet 4 and the outer end of the magnet 2 is at least 1mm, so as to ensure that the auxiliary magnetic conducting sheet 4 has a better effect on improving the magnetic flux distribution.

[0043] Optionally, the main magnetic conducting sheet 3 is provided with a cut corner 33, and the cut corner 33 is arranged at a region with a smaller magnetic flux density. The cut corner 33 can reduce the weight of the main magnetic conducting sheet 3, and realize the lightweight design of the magnetic circuit structure.

[0044] Optionally, the outer side of the top of the magnetic bowl 1 is provided with a chamfer 12, and the chamfer 12 is also arranged at a region with a smaller magnetic flux density, so as to reduce the weight of the magnetic bowl 1, and further help to realize the lightweight design of the magnetic circuit structure.

[0045] Specifically, in the embodiment, the outer side of the bottom of the magnetic bowl 1 is also provided with a chamfer 12. Compared with the prior art, even if the auxiliary magnetic conducting sheet 4 is additionally arranged, the overall weight of the magnetic circuit structure is reduced by about 5%.

[0046] In addition, the embodiment also provides a loudspeaker, which comprises the magnetic circuit structure described above, and has all the beneficial effects of the magnetic circuit structure, which will not be described herein.

[0047] Optionally, the voice coil 100 is a long voice coil or a short voice coil. The short voice coil is that the length of the voice coil 100 is shorter than the length of the air gap (the thickness of the magnetic conducting sheet), so that the voice coil 100 does not deviate from the uniform region of the magnetic field in the vibration process, so as to avoid the nonlinear distortion. The long voice coil is that the length of the voice coil 100 is longer than the length of the air gap, so that the voice coil 100 is coupled with all the magnetic flux in the vibration process, so as to keep the average magnetic induction density constant, so as to avoid the nonlinear distortion.

[0048] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A magnetic circuit structure, characterized by, The application relates to a magnetic circuit structure. The magnetic bowl (1) is provided with a containing groove, and a groove (11) is formed in the side wall of the containing groove; The magnet (2) is arranged in the containing groove, and a first magnetic gap (21) is formed between the magnet (2) and the bottom wall of the groove (11); The main magnetic guide sheet (3) is arranged on the magnet (2) and located in the containing groove, a second magnetic gap (31) is formed between the main magnetic guide sheet (3) and the side wall of the containing groove, and the second magnetic gap (31) is communicated with the first magnetic gap (21); under the action of a magnetic field force, the voice coil (100) is arranged in the first magnetic gap (21) and the second magnetic gap (31) in a position-adjustable mode; The auxiliary magnetic guide sheet (4) is arranged on the main magnetic guide sheet (3), and the distance between the outer end of the auxiliary magnetic guide sheet (4) and the voice coil (100) is greater than the distance between the outer end of the main magnetic guide sheet (3) and the voice coil (100).

2. The magnetic circuit structure according to claim 1, characterized in that The end surface of the main magnetic guide sheet (3) facing the magnet (2) is provided with a boss (32), and the boss (32) abuts against the magnet (2).

3. The magnetic circuit structure according to claim 2, characterized in that The outer end surface of the boss (32) is flush with the outer end surface of the magnet (2).

4. The magnetic circuit structure of claim 1, wherein The depth of the groove (11) is 1-2 mm.

5. The magnetic circuit structure of claim 1, wherein The horizontal distance between the outer end of the auxiliary magnetic guide sheet (4) and the outer end of the magnet (2) is at least 1 mm.

6. The magnetic circuit structure of claim 1, wherein The distance between the outer end of the main magnetic guide sheet (3) and the voice coil (100) is smaller than the distance between the outer end of the magnet (2) and the voice coil (100).

7. The magnetic circuit structure of claim 1, wherein The main magnetic guide sheet (3) is provided with a cut corner (33).

8. The magnetic circuit structure of claim 1, wherein The top outer side of the magnetic bowl (1) is provided with a chamfer (12).

9. A loudspeaker, characterized by The application further discloses a magnetic circuit structure comprising the magnetic circuit structure as claimed in any one of claims 1-8.

10. The loudspeaker of claim 9, wherein, The voice coil (100) is a long voice coil or a short voice coil.

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