Loudspeaker structure

Abstract

The utility model discloses a horn structure which comprises a support and U iron, the support is provided with an installation hole used for installing the U iron, and the U iron is installed in the installation hole. A plurality of limiting protruding blocks arranged at intervals are arranged on the inner circumferential side wall of an opening in the upper end of the mounting hole in a protruding mode, the U-iron is provided with a containing cavity with an opening in the upper end, a plurality of notches arranged at intervals are formed in the upper end of the U-iron in a concave mode, the limiting protruding blocks are matched with the notches, and the upper end of the U-iron extends out of the upper end of the mounting hole. Therefore, the magnetic flux at the position of the voice coil is improved, the sensitivity of the loudspeaker can be improved, the voice coil can be located in a magnetic gap dense area as much as possible during movement, distortion is reduced, the overall height of the loudspeaker is reduced, and heat dissipation during working of the loudspeaker is facilitated.

Description

Technical Field

[0001] The utility model relates to the technology of loudspeakers, in particular to a loudspeaker structure. Background Art

[0002] The concept of magnetic flux: Suppose there is a plane with an area of S perpendicular to the magnetic field direction in a uniform magnetic field with a magnetic induction intensity of B. The product of the magnetic induction intensity B and the area S is called the magnetic flux passing through this plane, simply referred to as magnetic flux, symbol "Φ", and the unit is Weber (Wb). Magnetic flux is a physical quantity representing the distribution of the magnetic field and is a scalar. If there are two magnetic fluxes with opposite directions passing through a plane, the magnetic flux of the plane at this time is the algebraic sum of the magnetic fluxes in the opposite directions. Φ = B·S. When there is an angle θ between the plane of S and the perpendicular plane of B, Φ = B·S·cosθ. Magnetic flux density is another name for magnetic induction intensity (B), which represents the number of magnetic force lines passing through a unit area perpendicularly. The magnetic flux density is simply referred to as the magnetic flux density, which reflects the density of magnetic force lines quantitatively. The stronger the magnetic field, the denser the magnetic force lines, the larger the value of B, and in the case of the same area, the larger the magnetic flux.

[0003] When an audio current is input to a loudspeaker, the energized voice coil is affected by a changing magnetic field force in the magnetic field and generates motion, driving the diaphragm to vibrate and pushing the air to produce sound. In addition to the strength of the electrical signal, the magnetic flux also plays a crucial role. For example, when comparing two loudspeakers with the same material configuration, if the magnet of one is larger in volume or higher in magnetic energy level than the other, the magnetic flux will be larger accordingly, resulting in enhanced control ability over the voice coil. When an electrical signal is input, the "start" and "stop" speeds are faster, and a loudspeaker with a high magnetic flux has better transient performance. The magnetic flux of a loudspeaker refers to the magnetic flux passing through the magnetic circuit space of the loudspeaker. Simply put, magnetic flux is the number of magnetic force lines in a magnetic field, which describes the strength and direction of the magnetic field. The magnetic flux of a loudspeaker is a special kind of magnetic flux used to evaluate the performance of the loudspeaker magnetic circuit and is the basis for designing and manufacturing various magnetic devices. The magnetic flux of a loudspeaker has a crucial impact on the performance of magnetic devices. The horn-shaped magnetic circuit has a wide application in acoustic transmission, so the magnitude and direction of its magnetic flux determine the transmission efficiency and quality.

[0004] In the application of magnets, magnetic flux (Magnetic Flux) is an important indicator for measuring the performance of magnets, especially in the fields of motors, loudspeakers, etc. The usual method is to perform simulation calculations through finite element analysis (Femm, Comsol) software. Through this method, the magnitude and direction of the magnetic flux of the loudspeaker can be predicted, providing a basis for design and optimization.

[0005] The magnetic circuit system also includes an invisible but very important part: the magnetic gap. The magnetic gap is not a physical part, but a narrow gap with a high magnetic field strength surrounded by the washer, magnet and U iron. It can be said that the three exist to form this magnetic gap. The symmetry and uniformity of the magnetic gap and the magnetic field near it have a significant impact on the distortion of the speaker unit.

[0006] The voice coil is the central component of the speaker unit. The speaker completes the conversion from electrical energy to mechanical energy by relying on the voice coil. The voice coil is in the magnetic gap surrounded by the washer and the magnetic column. When the current passes through, it generates force and movement. This force is the product of the magnetic flux density in the magnetic gap and the length of the voice coil wire, recorded as BL, which is also one of the important parameters of the speaker unit.

[0007] The voice coil's work is closely related to the magnetic circuit. First of all, the relative size of their geometric dimensions will significantly affect the sound performance of the speaker unit. According to the relationship between the height of the voice coil winding and the height of the magnetic gap, the voice coil magnetic circuit structure of the speaker unit can be divided into two categories: one is the long voice coil structure, that is, the voice coil is long and partly outside the magnetic gap, and the other is the short voice coil structure, that is, the voice coil is short and the whole is located inside the magnetic gap.

[0008] Since the magnetic field in the magnetic gap is relatively uniform, while the magnetic field outside the magnetic gap is non-uniform, within a certain range, that is, within the so-called linear stroke, the short voice coil structure always uses a uniform magnetic field. In order to obtain sufficient linear stroke, the short voice coil structure usually has a very thick washer and a very short voice coil height, but a very thick washer will reduce the magnetic flux density in the magnetic gap, and the short voice coil can only use a part of the magnetic energy. Therefore, in order to obtain appropriate efficiency, a magnet with a larger magnetic energy level and stronger magnet must be used, resulting in an increase in cost and speaker height.

[0009] The magnetic field used by the long voice coil always has a part that is uneven, so compared with the two, the short voice coil structure has lower distortion by nature, but can only use part of the magnetic field, and has low efficiency; while the long voice coil has higher distortion, but also higher efficiency, which is conducive to cost control. Therefore, most speaker units now have long voice coil structures, while short voice coil structures are rare, and most of them are used in tweeters or midrange units.

[0010] Based on the above, for the long voice coil structure, on the one hand, it is necessary to ensure that the voice coil is in the area with the most concentrated magnetic flux in the magnetic gap, so that the voice coil is always in a uniform magnetic field and obtains sufficient linear stroke; on the other hand, it is necessary to ensure that the voice coil does not deviate from the uniform magnetic field as much as possible when it moves up and down during operation, so as to avoid excessive linear distortion. Therefore, the design of the internal magnetic circuit and voice coil is basically idealized, hoping that the middle position of the voice coil height is aligned with the middle of the thickness of the washer, so that when the voice coil moves, it is in a uniform magnetic field as much as possible and can obtain the maximum magnetic flux.

[0011] However, it is difficult to achieve this goal due to many factors. For example, if the voice coil of the diaphragm sinks too deep, it will affect the support force and other acoustic characteristics of the diaphragm after material processing and forming, and there is a chance that it will touch the bracket, causing defects; the height of the voice coil is limited, and if it is designed too high, it will increase the weight of the vibration system and affect the acoustic characteristics. Moreover, if the voice coil is designed too high, it may hit the bottom of the U iron during movement, etc. Therefore, it is necessary to develop a technology that can solve all the above limitations and put the voice coil in a reasonable position in the magnetic circuit. Utility Model Content

[0012] In view of this, the present invention aims to solve the deficiencies in the prior art, and its main purpose is to provide a speaker structure, which improves the magnetic flux at the voice coil position, can increase the sensitivity of the speaker, and enable the voice coil to be located in the magnetic gap dense area as much as possible during movement, thereby reducing the generation of distortion and lowering the overall height of the speaker, which is beneficial to the heat dissipation of the speaker when it is working.

[0013] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0014] A speaker structure comprises a bracket and a U-iron, wherein the bracket has a mounting hole for mounting the U-iron, and the U-iron is mounted in the mounting hole; a plurality of spaced limiting protrusions are convexly provided on the inner peripheral side wall of the upper opening of the mounting hole, and the U-iron has a accommodating cavity with an upper opening, and a plurality of spaced notches are concavely provided on the upper end of the U-iron, and the limiting protrusions are matched with the notches, and the upper end of the U-iron extends out of the upper end of the mounting hole.

[0015] As a preferred solution, the plurality of limiting protrusions are arranged at intervals in the circumferential direction, and the plurality of notches are arranged at intervals in the circumferential direction.

[0016] As a preferred solution, the notch is recessed downward from the upper end surface of the U-iron, the notch passes through the inner and outer sides of the U-iron, and the notch is connected to the accommodating cavity.

[0017] As a preferred solution, the limiting protrusion extends into the notch, and the lower end surface of the limiting protrusion abuts against the bottom of the notch.

[0018] As a preferred embodiment, a clearance cavity is formed at the upper end of the bracket on the periphery of the mounting hole, the mounting hole is connected to the clearance cavity, the upper surface of the limiting protrusion is flush with the bottom surface of the clearance cavity, and the upper end of the U iron extends into the clearance cavity.

[0019] As a preferred solution, a first annular positioning step is protruding upward from the periphery of the make way cavity at the upper end of the bracket, and a second annular positioning step is protruding upward from the periphery of the first annular positioning step at the upper end of the bracket.

[0020] As a preferred solution, a sound hole is recessed downwardly at the bottom of the give way cavity, and the sound hole extends downwardly to the lower end of the bracket, and the lower end opening of the sound hole is covered with a sound-proof paper.

[0021] As a preferred solution, a PCB board is connected to the lower end of the bracket.

[0022] As a preferred embodiment, it also includes a diaphragm, a voice coil, a washer and a magnet, the diaphragm covers the upper end of the bracket, the magnet is installed in the accommodating cavity, the washer is stacked on the upper surface of the magnet, the upper end of the voice coil is connected to the diaphragm, the lower end of the voice coil extends into the accommodating cavity and is surrounded by the washer and the magnet, the outer peripheral side wall of the voice coil is set at a distance from the inner peripheral side wall of the accommodating cavity, and the inner peripheral side wall of the voice coil is set at a distance from the washer and the magnet.

[0023] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it is mainly through that the inner peripheral side wall of the upper end opening of the mounting hole of the bracket is convexly provided with a plurality of spaced limiting protrusions, and the upper end of the U iron is concavely provided with a plurality of spaced notches, so that the limiting protrusions are adapted to the notches, and the upper end of the U iron is extended out of the upper end of the mounting hole. In this way, after the diaphragm, voice coil, washer, magnet, etc. are assembled, the U iron can be assembled more deeply in the bracket, so that the middle of the voice coil and the washer can be The position is also closer, so that a larger magnetic flux will be obtained, and the magnetic field where the voice coil is located will be more uniform, which improves the magnetic flux at the voice coil position, can increase the sensitivity of the speaker, and enable the voice coil to be located as much as possible in the magnetic gap dense area during movement, reducing the generation of distortion, and the deeper assembly of the U-iron can reduce the overall height of the speaker. The upward depth of the U-iron raises the position of the U-iron on the bracket, which is equivalent to reducing the reserved depth of the U-iron, which can reduce the deposition of heat and can dissipate heat through the slots, which is beneficial to the heat dissipation of the speaker when it is working.

[0024] In order to more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the utility model;

[0026] Figure 2 This is a three-dimensional schematic diagram of the overall structure of an embodiment of the utility model from another angle;

[0027] Figure 3 It is an exploded schematic diagram of an embodiment of the utility model;

[0028] Figure 4It is another exploded view of an embodiment of the present utility model;

[0029] Figure 5 It is yet another exploded view of an embodiment of the present utility model;

[0030] Figure 6 It is a cross-sectional view of an embodiment of the present utility model.

[0031] Explanation of the drawing reference numerals:

[0032] 10. Bracket 11. Mounting hole

[0033] 12. Limiting convex block 13. Relief cavity

[0034] 14. First annular positioning step 15. Second annular positioning step

[0035] 16. Sound hole 20. U-shaped iron

[0036] 21. Accommodating cavity 22. Notch

[0037] 30. Diaphragm 40. Voice coil

[0038] 50. Washer 60. Magnet

[0039] 70. Sound insulating paper 80. PCB board. Detailed implementation manners

[0040] Please refer to Figures 1 to 6 as shown, which shows the specific structure of an embodiment of the present utility model.

[0041] As Figures 1 to 6 shown, a speaker structure includes a bracket 10, a U-shaped iron 20, a diaphragm 23, a voice coil 40, a washer 50 and a magnet 60. The bracket 10 has a mounting hole 11 for mounting the U-shaped iron 20, and the U-shaped iron 20 is mounted in the mounting hole 11. The U-shaped iron 20 has an accommodating cavity 21 with an upper end opening. The diaphragm 23 covers the upper end of the bracket 10. The magnet 60 is mounted in the accommodating cavity 21. The washer 50 is stacked on the upper surface of the magnet 60. The upper end of the voice coil 40 is connected to the diaphragm 23. The lower end of the voice coil 40 extends into the accommodating cavity 21 and surrounds the washer 50 and the magnet 60. A distance is provided between the outer peripheral side wall of the voice coil 40 and the inner peripheral side wall of the accommodating cavity 21, and a distance is provided between the inner peripheral side wall of the voice coil 40 and the washer 50 and the magnet 60. Moreover, the axes of the bracket 10, the U-shaped iron 20, the magnet 60, the washer 50, the voice coil 40 and the diaphragm 23 coincide, and a PCB board 80 is connected to the lower end of the bracket 10.

[0042] As Figures 3 to 6As shown, on the inner peripheral side wall of the upper opening of the mounting hole 11, a plurality of spacing - arranged limiting bumps 12 protrude. On the upper end of the U - shaped iron 20, a plurality of spacing - arranged notches 22 are recessed. The notches 22 are recessed downward from the upper end surface of the U - shaped iron 20. The notches 22 penetrate through the inner and outer sides of the U - shaped iron 20 and communicate with the accommodation cavity 21. The limiting bumps 12 extend into the notches 22, and the lower end surface of the limiting bumps 12 abuts against the bottom of the notches 22. The limiting bumps 12 and the notches 22 are adapted to each other. Preferably, the plurality of limiting bumps 12 are arranged at equal intervals in sequence along the circumferential direction, and the plurality of notches 22 are arranged at equal intervals in sequence along the circumferential direction. The upper end of the U - shaped iron 20 extends out of the upper end of the mounting hole 11. In this way, after assembling the diaphragm 23, voice coil 40, washer 50, magnet 60, etc., the U - shaped iron 20 can be assembled more deeply upward in the bracket 10, which can make the middle position between the voice coil 40 and the washer 50 closer. As a result, a larger magnetic flux will be obtained, the magnetic field where the voice coil 40 is located will be more uniform, which improves the magnetic flux at the position of the voice coil 40, can increase the sensitivity of the speaker, enables the voice coil 40 to be located in the dense magnetic gap area as much as possible during movement, reduces the generation of distortion, and the deeper assembly of the U - shaped iron 20 can reduce the overall height of the speaker. The upward deepening of the U - shaped iron 20 raises the position of the U - shaped iron 20 in the bracket 10, which is equivalent to reducing the reserved depth of the U - shaped iron 20, can play a role in reducing heat deposition, and can dissipate heat through the notches 22, which is beneficial to the heat dissipation when the speaker is working

[0043] As Figures 3 to 6 shown, a relief cavity 13 is formed on the upper end of the bracket 10 around the mounting hole 11. The mounting hole 11 communicates with the relief cavity 13. The upper surface of the limiting bump 12 is flush with the bottom surface of the relief cavity 13, and the upper end of the U - shaped iron 20 extends into the relief cavity 13. On the upper end of the bracket 10 around the relief cavity 13, a first annular positioning step 14 protrudes upward. Around the first annular positioning step 14, a second annular positioning step 15 protrudes upward on the upper end of the bracket 10. The lower end surface of the outer edge of the diaphragm 23 abuts against the upper surface of the first annular positioning step 14, and the outer peripheral side wall of the outer edge of the diaphragm 23 abuts against the inner peripheral side wall of the second annular positioning step 15

[0044] And, as Figures 2 to 6 shown, a sound hole 16 is recessed downward on the bottom of the relief cavity 13. The sound hole 16 penetrates downward to the lower end of the bracket 10, and a sound - blocking paper 70 covers the lower opening of the sound hole 16

[0045] In addition to the improvement in acoustic performance, the utility model is also helpful for the reliability test of the speaker. As is well known, when the speaker is working, the diaphragm 23 moves up and down, and high temperature will be generated due to air friction. On the one hand, it is easy to cause the adhesive glue to come off; on the other hand, it will cause damage to the diaphragm 23. The utility model raises the position of the U-shaped iron 20 on the bracket 10, which is equivalent to reducing the reserved depth of the U-shaped iron 20, and can play a role in reducing heat deposition. In addition, there are three notches 22 opened at the top of the U-shaped iron 20, which is more conducive to heat dissipation and can be discharged through the sound hole 16 in the rear cavity of the speaker.

[0046] In summary, the design focus of the utility model is that several spacing-arranged limiting bumps are convexly provided on the inner peripheral side wall of the upper end opening of the mounting hole of the bracket, and several spacing-arranged notches are concavely provided at the upper end of the U-shaped iron, so that the limiting bumps are adapted to the notches, and the upper end of the U-shaped iron extends out of the upper end of the mounting hole. In this way, after assembling the diaphragm, voice coil, washer, magnet, etc., the U-shaped iron can be assembled more deeply upward in the bracket, the middle position between the voice coil and the washer can be closer, and thus a larger magnetic flux can be obtained. The magnetic field where the voice coil is located will be more uniform, which improves the magnetic flux at the position of the voice coil, can increase the sensitivity of the speaker, enables the voice coil to be located in the dense magnetic gap area as much as possible during movement, reduces the generation of distortion, and the deeper assembly of the U-shaped iron can reduce the overall height of the speaker. The upward deepening of the U-shaped iron raises the position of the U-shaped iron on the bracket, which is equivalent to reducing the reserved depth of the U-shaped iron, can play a role in reducing heat deposition, and can dissipate heat through the notches, which is beneficial to the heat dissipation when the speaker is working.

Claims

1. A speaker structure, comprising a bracket and a U-iron, wherein the bracket has a mounting hole for mounting the U-iron, and the U-iron is mounted in the mounting hole; characterized in that: The inner peripheral side wall of the upper opening of the mounting hole is convexly provided with a plurality of spaced limiting protrusions, the U-iron has a accommodating cavity with an upper opening, the upper end of the U-iron is concavely provided with a plurality of spaced notches, the limiting protrusions are matched with the notches, and the upper end of the U-iron extends out of the upper end of the mounting hole.

2. A speaker structure according to claim 1, characterized in that: The plurality of limiting protrusions are arranged in sequence at intervals along the circumferential direction, and the plurality of notches are arranged in sequence at intervals along the circumferential direction.

3. A speaker structure according to claim 1, characterized in that: The notch is recessed downward from the upper end surface of the U iron, the notch passes through the inner and outer sides of the U iron, and the notch is connected to the accommodating cavity.

4. A speaker structure according to claim 1, characterized in that: The limiting protrusion extends into the notch, and the lower end surface of the limiting protrusion abuts against the bottom of the notch.

5. A speaker structure according to claim 1, characterized in that: The upper end of the bracket is formed with a clearance cavity at the periphery of the mounting hole, the mounting hole is connected with the clearance cavity, the upper surface of the limiting protrusion is flush with the bottom surface of the clearance cavity, and the upper end of the U iron extends into the clearance cavity.

6. A speaker structure according to claim 5, characterized in that: The upper end of the bracket is provided with a first annular positioning step protruding upwards at the periphery of the clearance cavity, and the periphery of the first annular positioning step is provided with a second annular positioning step protruding upwards at the upper end of the bracket.

7. A speaker structure according to claim 5, characterized in that: The bottom of the give way cavity is concavely provided with a sound hole, the sound hole penetrates downward to the lower end of the bracket, and the lower end opening of the sound hole is covered with a sound-proof paper.

8. The speaker structure according to claim 1, characterized in that: The lower end of the bracket is connected with a PCB board.

9. The speaker structure according to claim 1, characterized in that: It also includes a diaphragm, a voice coil, a washer and a magnet, wherein the diaphragm covers the upper end of the bracket, the magnet is installed in the accommodating cavity, the washer is stacked on the upper surface of the magnet, the upper end of the voice coil is connected to the diaphragm, the lower end of the voice coil extends into the accommodating cavity and is surrounded by the washer and the magnet, the outer peripheral side wall of the voice coil is spaced apart from the inner peripheral side wall of the accommodating cavity, and the inner peripheral side wall of the voice coil is spaced apart from the washer and the magnet.

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