Structure assembling method for moving coil microphone core voice diaphragm combination and magnetic circuit self-calibration concentricity

Abstract

The invention discloses a moving coil microphone core voice diaphragm combination and magnetic circuit self-calibration concentric structure assembling method, a microphone core comprises a first support, a second support, a vibrating diaphragm and a magnetic circuit combination, the vibrating diaphragm is fixedly arranged on the first support, a coil is arranged on one side of the vibrating diaphragm, the magnetic circuit combination is fixedly arranged on the second support, and the magnetic circuit combination has a magnetic field matched with the coil. When the first support and the second support are assembled into a whole, the coil and the magnetic circuit combination have a preset position relation, so that when the vibrating diaphragm vibrates to drive the coil to move, a magnetic induction line dense area in a magnetic field can be cut. The coil and the magnetic circuit combination can be ensured to have a unique fixed position relationship only by ensuring that the first bracket and the second bracket have a unique fixed position relationship when being assembled into a whole, so that a magnetic induction line dense region in a magnetic field of the magnetic circuit combination is cut when the vibrating diaphragm vibrates to drive the coil to move; therefore, the microphone has good sensitivity and accuracy. Only the position relation between the coil and the first support needs to be guaranteed, the diaphragm position does not need to be concerned and controlled, and the problem that direct positioning correction is difficult due to diaphragm characteristics is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of microphones, and in particular to a structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentricity. Background Art

[0002] As a basic device for voice communication, microphones have been applied in many fields after years of development. All microphones sense sound waves through flexible diaphragms. Under the pressure of sound waves, the diaphragm will displace, and the displacement change will be converted into changes in electrical parameters, thus realizing sound-to-electric conversion.

[0003] The working principle of a dynamic microphone is: when sound waves reach the microphone, the sound waves cause the diaphragm to vibrate, and the vibration of the diaphragm causes its coil to cut the magnetic flux lines of the magnetic circuit combination, thereby generating an electric potential. When the electric potential changes, it generates an electrical signal. This electrical signal is the sound signal collected by the microphone.

[0004] The basic structure of the current dynamic microphone includes a diaphragm, a magnetic circuit combination and a bracket. A coil is provided on one side of the diaphragm. During assembly, the magnetic circuit combination is installed on the bracket, and then the diaphragm with the coil is installed on the bracket. During installation, the position of the diaphragm needs to be adjusted through the coordination of human eyes and hands so that the coil falls into the area with the strongest magnetic flux lines of the magnetic circuit combination, and the coil cannot touch the magnetic circuit combination. It must be kept in an appropriate position, and then the diaphragm is fixed to the bracket with glue. With the above-mentioned traditional structure, the coil faces one side of the magnetic circuit assembly, and the positioning mechanism cannot be used to position and correct the coil during assembly. The position of the diaphragm can only be identified by the naked eye and adjusted manually. The position is manually set and then glued and fixed. During the glue fixation process, the diaphragm may also shift (the size of the slot for assembling the diaphragm on the bracket must be larger than the size of the diaphragm, and there must be a certain gap for installation. The existence of this gap results in a large displacement space for the assembly of the diaphragm, and the diaphragm is made of a thin and soft material, so the diaphragm cannot be directly positioned and corrected), resulting in inaccurate assembly position, and the coil cannot fall into the appropriate position, resulting in poor sensitivity and accuracy of the microphone. With this structure, not only can automated assembly not be achieved, but the efficiency is low, and the quality of assembly is also related to the proficiency of the operator, which can neither guarantee quality nor maintain consistency. Summary of the invention

[0005] The main purpose of the present invention is to provide a structural assembly method for a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentricity, so as to solve the technical problems mentioned in the background technology.

[0006] To achieve the above-mentioned purpose, one aspect of the present invention provides a structural assembly method of a dynamic microphone core, a sound membrane combination and a magnetic circuit self-aligning concentric structure, which is used for a microphone core, wherein the microphone core comprises a first bracket, a second bracket, a diaphragm and a magnetic circuit combination, wherein the diaphragm is fixedly mounted on the first bracket, a coil is provided on one side of the diaphragm, the magnetic circuit combination is fixedly mounted on the second bracket, the magnetic circuit combination has a magnetic field adapted to the coil, and when the first bracket and the second bracket are assembled as one, the coil and the magnetic circuit combination have a preset positional relationship, so that when the diaphragm vibrates and drives the coil to move, it can cut a dense area of ​​magnetic flux lines in the magnetic field; the assembly method comprises the following steps:

[0007] S1. Fix the coil to the diaphragm, and fix the diaphragm to the first bracket, so that the coil and the first bracket have a preset positional relationship; fix the magnetic circuit assembly to the second bracket, so that the magnetic circuit assembly and the second bracket have a preset positional relationship;

[0008] S2. Assemble the first bracket and the second bracket into one body so that the coil and the magnetic circuit combination have a preset positional relationship.

[0009] Furthermore, in step S1, the coil is first fixed to the diaphragm, and then the diaphragm with the coil is fixed to the first bracket, so that the coil and the first bracket have a preset positional relationship.

[0010] Furthermore, in step S1, after the coil is fixed to the diaphragm, a clamp is used to limit the diaphragm with the coil and the first bracket at the same time, so that the coil and the first bracket have a preset positional relationship after the two are assembled.

[0011] Furthermore, in step S1 , the diaphragm is first fixed to the first bracket, and then the coil is fixed to the diaphragm, so that the coil and the first bracket have a preset positional relationship.

[0012] Preferably, in step S2, after the first bracket and the second bracket are assembled into one, the coil and the magnetic circuit assembly are concentric.

[0013] Furthermore, the horizontal projection of the area with dense magnetic flux lines in the magnetic field is in the shape of a circular ring, and the horizontal projection of the coil is in the shape of a circle. In step S2, after the first bracket and the second bracket are assembled into one, the circle is concentric with the circular ring and the diameter of the circle is between the inner diameter and the outer diameter of the circular ring, so that the coil and the magnetic circuit combination are concentric.

[0014] Furthermore, in step S2, after the first bracket and the second bracket are assembled into one, the first bracket and the second bracket have a preset height position relationship, so that when the diaphragm vibrates and drives the coil to move, it can cut the area with dense magnetic flux lines in the magnetic field.

[0015] Preferably, in step S2, when the first bracket and the second bracket are assembled as one, they have a unique height position relationship.

[0016] Preferably, in step S2, when the first bracket and the second bracket are assembled, the first bracket and the second bracket are first adjusted to reach an optimal height position relationship, and then the first bracket and the second bracket are connected and fixed.

[0017] Furthermore, the magnetic circuit assembly comprises a magnetic bowl, a magnet and a magnetic sheet, the longitudinal cross section of the magnetic bowl is U-shaped, the magnet and the magnetic sheet are both cylindrical, the magnet is arranged at the center of the inner bottom surface of the magnetic bowl, the magnetic sheet is arranged on the top surface of the magnet, and the area between the side wall of the magnetic sheet and the inner wall of the magnetic bowl is a dense area of ​​magnetic flux lines in the magnetic field;

[0018] In step S2, after the first bracket and the second bracket are assembled into one, the vibration of the diaphragm drives the coil to move so as to cut the area between the side wall of the magnetic conductive sheet and the inner wall of the magnetic conductive bowl.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The diaphragm with the coil is arranged on the first bracket and ensures that the coil and the first bracket have a unique fixed positional relationship. The magnetic circuit combination is arranged on the second bracket and ensures that the magnetic circuit combination and the first bracket have a unique fixed positional relationship. In this way, it is only necessary to ensure that the first bracket and the second bracket have a unique fixed positional relationship when assembled as one to ensure that the coil and the magnetic circuit combination have a unique fixed positional relationship, thereby ensuring that when the diaphragm vibrates and drives the coil to move, it can cut the dense magnetic flux lines area in the magnetic field of the magnetic circuit combination, so that the microphone has better sensitivity and accuracy.

[0021] 2. It is only necessary to ensure the positional relationship between the coil and the first bracket, without paying attention to and controlling the position of the diaphragm, thus overcoming the problem that the diaphragm is thin and soft, which makes it difficult to directly position and correct it. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure decomposition of Example 1 of the present invention;

[0024] Figure 2This is a cross-sectional view of the overall structure of Example 1 of the present invention;

[0025] Figure 3 for Figure 2 A partial enlarged schematic diagram of a;

[0026] Figure 4 This is a schematic diagram of the assembly state of the first bracket and the second bracket of Example 1 of the present invention;

[0027] Figure 5 This is a schematic diagram of the assembly state of the first bracket and the diaphragm with the coil according to Embodiment 1 of the present invention;

[0028] Figure 6 for Figure 5 b is a partial enlarged schematic diagram of .

[0029] Explanation of the accompanying drawings: 1-first bracket; 2-second bracket; 3-diaphragm; 4-first mounting groove; 5-limiting ridge; 6-first air hole; 7-limiting slide groove; 8-limiting end; 9-limiting groove; 10-magnetic bowl; 11-magnet; 12-magnetic sheet; 13-second mounting groove; 14-supporting protrusion; 15-second air hole; 16-coil; 17-positioning column; 18-guide end. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Example 1: Reference Figures 1 to 6 , a microphone core of a dynamic microphone, comprising a first bracket 1, a second bracket 2, a diaphragm 3 and a magnetic circuit assembly, wherein the diaphragm 3 is fixedly mounted on the first bracket 1, a coil 16 is arranged on one side of the diaphragm 3, the magnetic circuit assembly is fixedly mounted on the second bracket 2, the magnetic circuit assembly has a magnetic field adapted to the coil 16, and when the first bracket 1 and the second bracket 2 are assembled as one, the coil 16 and the magnetic circuit assembly have a preset positional relationship, so that when the diaphragm 3 vibrates and drives the coil 16 to move, it can cut the area with dense magnetic flux lines in the magnetic field. In this embodiment, the horizontal projection of the area with dense magnetic flux lines in the magnetic field is in the shape of a circular ring, and when the first bracket 1 and the second bracket 2 are assembled as one, the horizontal projection of the coil 16 is in the shape of a circle, the circle is concentric with the circular ring, and the diameter of the circle is the average value of the inner diameter and the outer diameter of the circular ring, so that the coil 16 and the magnetic circuit assembly are concentric and have a certain horizontal positional relationship.

[0034] Specifically, one end of the first bracket 1 is provided with a first mounting groove 4 adapted to the diaphragm 3, and the diaphragm 3 is provided at the first mounting groove 4. The first bracket 1 is provided with a first stopper, and the second bracket 2 is provided with a second stopper matched with the first stopper. When the first bracket 1 and the second bracket 2 are assembled as one, the first stopper and the second stopper interact with each other so that the coil 16 and the magnetic circuit combination have a preset position relationship. In this embodiment, the first bracket 1 is cylindrical, the first stopper is a plurality of stopper ridges 5 provided on the inner wall of the first bracket 1, the plurality of stopper ridges are evenly distributed along the circumference, and the adjacent stopper ridges 5 are hollowed out to form a first air vent 6, and the second stopper is a stopper slide 7 provided on the outer wall of the second bracket 2, the stopper ridge 5 and the stopper slide 7 are interference fit or transition fit, and during assembly, the stopper ridge 5 can slide and assemble along the stopper slide 7, and after assembly, there is no gap between the stopper ridge 5 and the stopper slide 7, so that precise positioning can be achieved. The top of the limiting ridge 5 is extended toward the center of the first bracket 1 and is provided with a limiting end 8, and the top surface of the second bracket 2 is provided with a limiting groove 9 corresponding to the limiting end 8. When the first bracket 1 and the second bracket 2 slide relatively into place and are assembled as a whole, the limiting end 8 is clamped in the limiting groove 9, playing a limiting locking role, so that the first bracket 1 and the second bracket 2 have a unique fixed position relationship after being assembled into place.

[0035] More specifically, the magnetic circuit assembly includes a magnetic bowl 10, a magnet 11 and a magnetic sheet 12. The longitudinal cross-section of the magnetic bowl 10 is U-shaped. The magnet 11 and the magnetic sheet 12 are both cylindrical. The magnet 11 is arranged at the center of the inner bottom surface of the magnetic bowl 10, and the magnetic sheet 12 is arranged on the top surface of the magnet 11. The area between the side wall of the magnetic sheet 12 and the inner wall of the magnetic bowl 10 is a dense area of ​​magnetic flux lines in the magnetic field. The top of the second bracket 2 is concavely provided with a second mounting groove 13 for assembling the magnetic circuit assembly. The inner wall of the second mounting groove 13 extends toward one side of the magnetic circuit assembly and is provided with a plurality of supporting protrusions 14. The plurality of supporting protrusions 14 are evenly distributed along the circumference of the magnetic circuit assembly. The magnetic circuit assembly is tightly mounted in the second mounting groove 13, ensuring that the magnetic circuit assembly is restricted to a single fixed position. Adjacent supporting protrusions 14 are hollowed out to form a second air vent 15. The first air hole 6 and the second air hole 15 are provided to balance the air pressure on both sides of the diaphragm 3 so that the diaphragm 3 can vibrate normally when subjected to sound pressure.

[0036] The assembly method of this embodiment comprises the following steps:

[0037] S1, fix the coil 16 to the diaphragm 3, and fix the diaphragm 3 to the first bracket 1, so that the coil 16 and the first bracket 1 have a preset positional relationship; fix the magnetic circuit assembly on the second bracket 2, so that the magnetic circuit assembly and the second bracket 2 have a preset positional relationship;

[0038] S2. Assemble the first bracket 1 and the second bracket 2 into one body, so that the coil 16 and the magnetic circuit combination have a preset position relationship.

[0039] Specifically, in step S1, the coil 16 is first fixed to the diaphragm 3, and then the diaphragm 3 with the coil 16 is fixed to the first bracket 1, so that the coil 16 is concentric with the first bracket 1; or, in step S1, the diaphragm 3 is first fixed to the first bracket 1, and then the coil 16 is fixed to the diaphragm 3, so that the coil 16 is concentric with the first bracket 1; at the same time, the magnetic circuit combination is fixed to the second bracket 2, so that the magnetic circuit combination is concentric with the second bracket 2. In this embodiment, in step S1, the coil 16 is first fixed on one side of the diaphragm 3, and the first bracket 1 is clamped and fixed by a clamp, the clamp includes a placement groove for placing the first bracket 1, and a positioning column 17 adapted to the coil is extended upward from the center of the clamp, and a guide end 18 is provided at the top of the positioning column 17, and the outer diameter of the guide end 18 is smaller than the inner diameter of the circle formed by the coil 16. When the first bracket 1 is placed in the placement groove, the first bracket 1 has a uniquely determined positional relationship with the placement groove, that is, the first bracket 1 also has a uniquely determined positional relationship with the positioning column 17. At this time, when the diaphragm 3 with the coil 16 is placed on the first mounting groove of the first bracket 1 The inner diameter of the first mounting groove 4 is slightly larger than the outer diameter of the diaphragm 3, which is about 2 mm. There must be a certain gap for installation. The existence of the gap results in a larger displacement space for the assembly of the diaphragm 3. In addition, the first bracket 1 is made of plastic, and there will be errors during injection molding. This results in a non-unique positional relationship when the diaphragm 3 is assembled in the first mounting groove 4), the coil 16 is sleeved on the positioning post 17 under the action of the guide end 18, and the positioning post 17 is used to limit the coil 16, which ensures that the coil 16 and the first bracket 1 have a unique and determined positional relationship during assembly, and then glue is applied to fix them, thereby completing the connection between the diaphragm 3 and the first bracket 1.

[0040] In step S2, after the first bracket 1 and the second bracket 2 are assembled into one, the coil 16 and the magnetic circuit assembly are concentric.

[0041] The beneficial effects of this embodiment are as follows:

[0042] 1. The diaphragm 3 with the coil 16 is arranged on the first bracket 1 and ensures that the coil 16 and the first bracket 1 have a unique fixed position relationship. The magnetic circuit assembly is arranged on the second bracket 2 and ensures that the magnetic circuit assembly and the second bracket 2 have a unique fixed position relationship. In this way, it is only necessary to ensure that the first bracket 1 and the second bracket 2 have a unique fixed position relationship when they are assembled as one, so as to ensure that the coil 16 and the magnetic circuit assembly have a unique fixed position relationship, thereby ensuring that the vibration of the diaphragm 3 drives the coil 16 to move, and can cut the dense magnetic flux line area in the magnetic field of the magnetic circuit assembly, so that the microphone has better sensitivity and accuracy;

[0043] 2. It is only necessary to ensure the positional relationship between the coil 16 and the first bracket 1, without paying attention to and controlling the position of the diaphragm 3, thus overcoming the problem that the diaphragm 3 is thin and soft and thus difficult to directly position and correct;

[0044] 3. The limiting ridge 5 and the limiting slide groove 7 are interference fit or transition fit. During assembly, the limiting ridge 5 can slide and assemble along the limiting slide groove 7, and after assembly, there is no gap between the limiting ridge 5 and the limiting slide groove 7, which can achieve precise positioning and ensure that the first bracket 1 and the second bracket 2 have a unique fixed position relationship;

[0045] 4. The first air hole 6 and the second air hole 15 are provided to balance the air pressure on both sides of the diaphragm 3 so that the diaphragm 3 can vibrate normally when subjected to sound pressure.

[0046] Embodiment 2: The difference between this embodiment and embodiment 1 is that this embodiment does not provide a limiting end and a limiting groove, that is, the relative height of the first bracket and the second bracket is adjustable, and one adjustment dimension is retained. The relative height position of the two is set according to the actual situation, so that it can adapt to the height position difference of the area with the densest magnetic flux lines caused by the individual differences of the magnetic circuit combination. Specifically, the frequency response test method is adopted to adjust the relative height of the first bracket and the second bracket, and the optimal height position relationship is obtained when the sound capture ability at different frequencies is optimal, and then the first bracket and the second bracket are fixed with glue. Even more, the relative height position of the first bracket and the second bracket is designed to be adjusted in a real-time manner, and dynamically adjusted according to the frequency response situation to keep the sound pickup performance of the microphone in the best state.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A structural assembly method for a dynamic microphone core sound film combination and a magnetic circuit self-aligning concentric structure, used for a microphone core, characterized in that: The microphone core comprises a first bracket, a second bracket, a diaphragm and a magnetic circuit combination, wherein the diaphragm is fixedly mounted on the first bracket, a coil is disposed on one side of the diaphragm, the magnetic circuit combination is fixedly mounted on the second bracket, the magnetic circuit combination has a magnetic field adapted to the coil, and when the first bracket and the second bracket are assembled as one, the coil and the magnetic circuit combination have a preset positional relationship, so that when the diaphragm vibrates and drives the coil to move, it can cut a dense area of ​​magnetic flux lines in the magnetic field; the assembly method comprises the following steps: S1. Fix the coil to the diaphragm, and fix the diaphragm to the first bracket, so that the coil and the first bracket have a preset positional relationship; fix the magnetic circuit assembly to the second bracket, so that the magnetic circuit assembly and the second bracket have a preset positional relationship; S2. Assemble the first bracket and the second bracket into one body so that the coil and the magnetic circuit combination have a preset positional relationship.

2. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 1, characterized in that: In step S1 , the coil is first fixed on the diaphragm, and then the diaphragm with the coil is fixed on the first bracket, so that the coil and the first bracket have a preset positional relationship.

3. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 2, characterized in that: In step S1, after the coil is fixed to the diaphragm, a clamp is used to limit the diaphragm with the coil and the first bracket at the same time, so that the coil and the first bracket have a preset positional relationship after the two are assembled.

4. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 1, characterized in that: In step S1 , the diaphragm is first fixed to the first bracket, and then the coil is fixed to the diaphragm, so that the coil and the first bracket have a preset positional relationship.

5. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 1, characterized in that: In step S2, after the first bracket and the second bracket are assembled into one, the coil and the magnetic circuit are combined concentrically.

6. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 5, characterized in that: The horizontal projection of the area with dense magnetic flux lines in the magnetic field is in the shape of a circular ring, and the horizontal projection of the coil is in the shape of a circle. In step S2, after the first bracket and the second bracket are assembled into one, the circle is concentric with the circular ring and the diameter of the circle is between the inner diameter and the outer diameter of the circular ring, so that the coil and the magnetic circuit combination are concentric.

7. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 1, characterized in that: In step S2, after the first bracket and the second bracket are assembled into one, the first bracket and the second bracket have a preset height position relationship, so that when the diaphragm vibrates and drives the coil to move, it can cut the area with dense magnetic flux lines in the magnetic field.

8. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 7, characterized in that: In step S2, when the first bracket and the second bracket are assembled into one body, they have a unique height position relationship.

9. The structural assembly method of a dynamic microphone core and sound membrane combination and a magnetic circuit self-aligning concentric structure according to claim 7, characterized in that: In step S2, when the first bracket and the second bracket are assembled, the first bracket and the second bracket are first adjusted to reach an optimal height position relationship, and then the first bracket and the second bracket are connected and fixed.

10. A method for assembling a dynamic microphone core and a sound membrane assembly and a magnetic circuit self-aligning concentric structure according to any one of claims 1 to 9, characterized in that: The magnetic circuit assembly comprises a magnetic bowl, a magnet and a magnetic sheet, the longitudinal cross section of the magnetic bowl is U-shaped, the magnet and the magnetic sheet are both cylindrical, the magnet is arranged at the center of the inner bottom surface of the magnetic bowl, the magnetic sheet is arranged on the top surface of the magnet, and the area between the side wall of the magnetic sheet and the inner wall of the magnetic bowl is a dense area of ​​magnetic flux lines in the magnetic field; In step S2, after the first bracket and the second bracket are assembled into one, the vibration of the diaphragm drives the coil to move so as to cut the area between the side wall of the magnetic conductive sheet and the inner wall of the magnetic conductive bowl.

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