Moving-coil microphone core

Abstract

The utility model discloses a moving-coil microphone core, which 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, the magnetic circuit combination is provided with a magnetic field matched with the coil, and when the first support and the second support are assembled into a whole, the magnetic field is matched with the coil. And the coil and the magnetic circuit combination have a preset position relationship, 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 unique fixed position relation between the coil and the magnetic circuit combination can be ensured only by ensuring that the first bracket and the second bracket have the unique fixed position relation when being assembled into a whole, so that a magnetic induction line dense area in a magnetic field of the magnetic circuit combination can be 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 utility model relates to microphone technical field, especially involve a microphone core of moving coil microphone. BACKGROUND

[0002] As the basic device of voice communication, microphone has been applied in many fields after years of development. All microphones collect sound signals through flexible diaphragm to induce sound waves. Under the pressure of sound waves, the diaphragm will displace and convert the displacement change into the change of electrical parameter, so as to realize the conversion of sound and electricity.

[0003] The working principle of magneto microphone is that when sound waves reach the microphone, the vibration of the diaphragm will cause the coil to cut the magnetic induction lines of the magnetic circuit combination, and then generate an electric potential. When the electric potential changes, it will generate an electric signal. This electric signal is the sound signal collected by the microphone.

[0004] The basic structure of the current electromagnetic microphone includes a diaphragm, a magnetic circuit combination and a bracket. One side of the diaphragm is provided with a coil. 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 by the cooperation of the naked eye and hands, so that the coil falls into the strongest area of the magnetic induction lines of the magnetic circuit combination, and the coil cannot touch the magnetic circuit combination and needs to be kept in a proper position. Then the diaphragm is fixed by gluing. With the above traditional structure, the coil is on the side of the magnetic circuit combination, and it is impossible to use a positioning mechanism to position and correct the coil during assembly. Only the position of the diaphragm can be manually adjusted by the naked eye, and then fixed by gluing after the position is manually fixed. However, the diaphragm may also be displaced during the gluing process (the size of the groove on the bracket must be larger than the size of the diaphragm, and there must be a gap to enable the installation, and the gap leads to a large displacement space for the assembly of the diaphragm. The diaphragm is made of light, thin and soft material, and cannot be directly positioned and corrected). This makes the assembly position inaccurate, and the coil cannot fall into the proper position, resulting in poor sensitivity and accuracy of the microphone. With this structure, it is impossible to realize automatic assembly, and the efficiency is low. Moreover, the quality of assembly is related to the operation proficiency, which cannot guarantee the quality and consistency. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a microphone core of moving coil microphone, which solves the technical problems mentioned in the background art.

[0006] In order to achieve the above object, one aspect of the utility model provides a dynamic microphone's microphone core, including first support, second support, diaphragm and magnetic circuit combination, the diaphragm is fixed in the first support, one side of the diaphragm is equipped with coil, the magnetic circuit combination is fixed in the second support, the magnetic circuit combination has the magnetic field that is adapted with the coil, when the first support and the second support are assembled as a whole, the coil and the magnetic circuit combination have the positional relationship of prearranging, to make the diaphragm vibration drive the coil movement can cut the magnetic field in the magnetic induction line dense area.

[0007] Further, one end of the first support is provided with a first mounting groove matched with the diaphragm, and the diaphragm is arranged at the first mounting groove.

[0008] Further, the first support is provided with a first limiting piece, and the second support is provided with a second limiting piece matched with the first limiting piece, when the first support and the second support are assembled as a whole, the first limiting piece and the second limiting piece interact to make the coil and the magnetic circuit combination have the positional relationship of prearranging.

[0009] Further, the first support is cylindrical, the first limiting piece is a plurality of limiting ridges arranged on the inner wall of the first support, a plurality of the limiting protrusions are uniformly distributed along the circumference, the adjacent limiting ridges are hollow to form first air holes, and the second limiting piece is a limiting sliding groove arranged on the outer wall of the second support, and the limiting ridges and the limiting sliding grooves are interference fit or transition fit.

[0010] Further, the top end of the limiting ridge extends to the center of the first support and is provided with a limiting end, and the top surface of the second support is provided with a limiting groove corresponding to the limiting end, when the first support and the second support are assembled as a whole, the limiting end is clamped in the limiting groove.

[0011] Further, the magnetic circuit combination includes a magnetic conducting bowl, a magnet and a magnetic conducting sheet, the longitudinal section of the magnetic conducting bowl is U-shaped, the magnet and the magnetic conducting sheet are both cylindrical, the magnet is arranged at the center of the inner bottom surface of the magnetic conducting bowl, the magnetic conducting sheet is arranged on the top surface of the magnet, and the area between the side wall of the magnetic conducting sheet and the inner wall of the magnetic conducting bowl is the magnetic induction line dense area in the magnetic field.

[0012] Further, the top of the second support is concave and provided with a second mounting groove for assembling the magnetic circuit combination.

[0013] Further, the inner wall of the second mounting groove extends to one side of the magnetic circuit combination and is provided with a plurality of supporting protrusions, a plurality of the supporting protrusions are uniformly distributed along the circumference of the magnetic circuit combination, and the adjacent supporting protrusions are hollow to form second air holes.

[0014] Further, the horizontal projection of the magnetic field dense area in the magnetic field is in the form of a circular ring, and the horizontal projection of the coil is in the form of a circle when the first support and the second support are assembled into one body, 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.

[0015] Preferably, the diameter of the circle is the average of the inner diameter and the outer diameter of the circular ring.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The coil diaphragm is arranged on the first support and the coil and the first support have a unique fixed positional relationship, and the magnetic circuit combination is arranged on the second support and the magnetic circuit combination and the first support have a unique fixed positional relationship, so that only the first support and the second support have a unique fixed positional relationship when assembled into one body, the coil and the magnetic circuit combination have a unique fixed positional relationship, thereby ensuring that the diaphragm can cut the magnetic field dense area of the magnetic circuit combination when the diaphragm drives the coil to move, so that the microphone has better sensitivity and accuracy.

[0018] 2. The positional relationship between the coil and the first support is only required to be ensured, and the position of the diaphragm does not need to be concerned and controlled, thereby overcoming the problem that the diaphragm is thin, soft and difficult to be directly positioned and corrected. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0020] Figure 1 It is a schematic view of the exploded structure of the embodiment 1 of the utility model.

[0021] Figure 2 It is a sectional view of the overall structure of the embodiment 1 of the utility model.

[0022] Figure 3 It is a sectional view of the overall structure of the embodiment 1 of the utility model. Figure 2 It is an enlarged schematic view of the local a.

[0023] Figure 4 It is a schematic view of the assembled state of the first support and the second support of the embodiment 1 of the utility model.

[0024] The first support 1, the second support 2, the diaphragm 3, the first mounting groove 4, the limiting ridge 5, the first air hole 6, the limiting sliding slot 7, the limiting end 8, the limiting groove 9, the magnetic conducting bowl 10, the magnet 11, the magnetic conducting sheet 12, the second mounting groove 13, the supporting protrusion 14, the second air hole 15 and the coil 16. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0027] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0028] Embodiment 1: Refer to Figures 1 to 4 A moving-coil microphone, comprising a first support 1, a second support 2, a diaphragm 3 and a magnetic circuit combination, the diaphragm 3 is fixedly arranged on the first support 1, one side of the diaphragm 3 is provided with a coil 16, the magnetic circuit combination is fixedly arranged on the second support 2, the magnetic circuit combination has a magnetic field matched with the coil 16, when the first support 1 and the second support 2 are assembled into one body, the coil 16 and the magnetic circuit combination have a preset positional relationship, so that the diaphragm 3 can cut the magnetic induction line dense area in the magnetic field when vibrating to drive the coil 16 to move. In the present embodiment, the horizontal projection of the magnetic induction line dense area in the magnetic field is in the shape of a circular ring, when the first support 1 and the second support 2 are assembled into one body, 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.

[0029] Specifically, one end of the first support 1 is provided with a first mounting groove 4 matched with the diaphragm 3, and the diaphragm 3 is arranged at the first mounting groove 4. The first support 1 is provided with a first limiting piece, and the second support 2 is provided with a second limiting piece matched with the first limiting piece. When the first support 1 and the second support 2 are assembled into one, the first limiting piece and the second limiting piece interact to make the coil 16 and the magnetic circuit combination have a preset positional relationship. In this embodiment, the first support 1 is in a cylindrical shape, and the first limiting piece is a plurality of limiting ridges 5 arranged on the inner wall of the first support 1. The plurality of limiting ridges are uniformly distributed along the circumference, and the adjacent limiting ridges 5 are hollow to form first air holes 6. The second limiting piece is a limiting sliding groove 7 arranged on the outer wall of the second support 2. The limiting ridges 5 and the limiting sliding groove 7 are in interference fit or transition fit. When assembled, the limiting ridges 5 can slide along the limiting sliding groove 7 to assemble and combine, and after assembly is completed, the limiting ridges 5 and the limiting sliding groove 7 have no gap, which can realize accurate positioning. The top end of the limiting ridge 5 extends to the center of the first support 1 and is provided with a limiting end 8. The top surface of the second support 2 is provided with a limiting groove 9 corresponding to the limiting end 8. When the first support 1 and the second support 2 are relatively slid into position and assembled into one, the limiting end 8 is clamped in the limiting groove 9, which plays a limiting locking role, so that the first support 1 and the second support 2 have a unique fixed positional relationship after assembly.

[0030] More specifically, the magnetic circuit combination includes a magnetic conducting bowl 10, a magnet 11 and a magnetic conducting sheet 12. The longitudinal section of the magnetic conducting bowl 10 is in a U shape. The magnet 11 and the magnetic conducting sheet 12 are both in a cylindrical shape. The magnet 11 is arranged at the center of the inner bottom surface of the magnetic conducting bowl 10. The magnetic conducting sheet 12 is arranged on the top surface of the magnet 11. The area between the side wall of the magnetic conducting sheet 12 and the inner wall of the magnetic conducting bowl 10 is a dense magnetic induction line area in the magnetic field. The top of the second support 2 is concave and is provided with a second mounting groove 13 for assembling the magnetic circuit combination. The inner wall of the second mounting groove 13 extends to one side of the magnetic circuit combination and is provided with a plurality of supporting protrusions 14. The plurality of supporting protrusions 14 are uniformly distributed along the circumference of the magnetic circuit combination, which ensures that the magnetic circuit combination is limited in a unique fixed position. The adjacent supporting protrusions 14 are hollow to form second air holes 15. The first air holes 6 and the second air holes 15 are both arranged to balance the air pressure on both sides of the diaphragm 3, so that the diaphragm 3 can normally vibrate when subjected to sound pressure.

[0031] The assembly method of this embodiment includes the following steps:

[0032] S1, the coil 16 is fixedly arranged on the diaphragm 3, and the diaphragm 3 is fixedly arranged on the first support 1, so that the coil 16 and the first support 1 have a preset positional relationship. The magnetic circuit combination is fixedly arranged on the second support 2, so that the magnetic circuit combination and the second support 2 have a preset positional relationship.

[0033] S2, the first support 1 and the second support 2 are assembled into one, so that the coil 16 and the magnetic circuit combination have a preset positional relationship.

[0034] 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 support 1, so that the coil 16 is concentric with the first support 1; or in step S1, the diaphragm 3 is first fixed to the first support 1, and then the coil 16 is fixed to the diaphragm 3, so that the coil 16 is concentric with the first support 1; at the same time, the magnetic circuit combination is fixed to the second support 2, so that the magnetic circuit combination is concentric with the second support 2.

[0035] More specifically, when the diaphragm 3 with the coil 12 is combined with the first support 1, the first support 1 is first clamped and fixed by a clamp, the center of the clamp extends upward and is provided with a positioning column, when the first support 1 is clamped by the clamp, the positioning column penetrates the center of the first support 1, at this time, the first support 1 is concentric with the positioning column, the top end of the positioning column is provided with a guide

[0036] Specifically, in step S2, after the first support 1 and the second support 2 are assembled into one body, the first support 1 and the second support 2 are concentric, 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, preferably the diameter is the average of the inner diameter and the outer diameter. At the same time, in step S2, when the first support 1 and the second support 2 are assembled into one body, the relative height of the two can be adjusted so that the diaphragm 3 can cut the magnetic induction line dense area in the magnetic field when the diaphragm 3 drives the coil 16 to move.

[0037] The embodiment has the following beneficial effects:

[0038] 1. The diaphragm 3 with the coil 16 is arranged on the first support 1, and the position relationship between the coil 16 and the first support 1 is ensured to be unique and fixed, the magnetic circuit combination is arranged on the second support 2, and the position relationship between the magnetic circuit combination and the first support 1 is ensured to be unique and fixed, so that only the position relationship between the first support 1 and the second support 2 assembled into one body needs to be ensured to be unique and fixed, and the position relationship between the coil 16 and the magnetic circuit combination can be ensured to be unique and fixed, thereby ensuring that the diaphragm 3 can cut the magnetic induction line dense area in the magnetic field of the magnetic circuit combination when the diaphragm 3 drives the coil 16 to move, and the microphone has better sensitivity and accuracy;

[0039] 2. Only the position relationship between the coil 16 and the first support 1 needs to be ensured, and the position of the diaphragm 3 does not need to be concerned and controlled, thereby overcoming the problem that the diaphragm 3 is thin, soft and difficult to be directly positioned and corrected;

[0040] 3. The limiting ridge 5 and the limiting sliding groove 7 are in interference fit or transition fit, during assembly, the limiting ridge 5 can slide along the limiting sliding groove 7 to assemble and combine, and after assembly is completed, the limiting ridge 5 and the limiting sliding groove 7 have no gap, precise positioning can be achieved, and the unique and fixed position relationship between the first support 1 and the second support 2 is ensured;

[0041] 4. The first air hole 6 and the second air hole 15 are arranged to balance the air pressure on both sides of the diaphragm 3, so that the diaphragm 3 can normally vibrate when subjected to sound pressure.

[0042] Embodiment 2: The difference between this embodiment and embodiment 1 is that this embodiment does not set the limiting end and the limiting groove, that is, the relative height of the first support and the second support is adjustable, one adjustment dimension is reserved, and the relative height position of the two is set according to the actual situation, so that the height position difference of the most dense area of the magnetic induction line caused by the individual difference of the magnetic circuit combination can be adapted. That is, if the area is a little higher or a little lower, it can be overcome by adjusting the relative height of the first support and the second support. Even, it can be dynamically adjusted according to the situation of audio input and electrical signal output, so that the microphone is in an optimal state.

[0043] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields under the utility model concept of the present application is included in the patent protection range of the present application.

Claims

1. A microphone core for a dynamic microphone, characterized in that: The device includes a first support, a second support, a diaphragm, and a magnetic circuit assembly. The diaphragm is fixed to the first support, and a coil is provided on one side of the diaphragm. The magnetic circuit assembly is fixed to the second support and has a magnetic field adapted to the coil. When the first support and the second support are assembled as a whole, the coil and the magnetic circuit assembly have a preset positional relationship so that when the diaphragm vibrates and drives the coil to move, it can cut through the dense magnetic field lines in the magnetic field.

2. The microphone core of a dynamic microphone according to claim 1, characterized in that: One end of the first bracket is provided with a first mounting groove that is adapted to the diaphragm, and the diaphragm is disposed in the first mounting groove.

3. The microphone core of a dynamic microphone according to claim 1, characterized in that: The first bracket is provided with a first limiting member, and the second bracket is provided with a second limiting member that cooperates with the first limiting member. When the first bracket and the second bracket are assembled as one unit, the first limiting member and the second limiting member interact to make the coil and the magnetic circuit combination have a preset positional relationship.

4. The microphone core of a dynamic microphone according to claim 3, characterized in that: The first support is cylindrical, and the first limiting member is a plurality of limiting ridges provided on the inner wall of the first support. The plurality of limiting ridges are evenly distributed along the circumference, and a first vent hole is formed between adjacent limiting ridges. The second limiting member is a limiting groove provided on the outer wall of the second support. The limiting ridges and the limiting groove are interference fit or transition fit.

5. The microphone core of a dynamic microphone according to claim 4, characterized in that: The top of the limiting ridge extends toward the center of the first bracket and is provided with a limiting end. The top surface of the second bracket is provided with a limiting groove corresponding to the limiting end. When the first bracket and the second bracket are assembled as one unit, the limiting end is engaged in the limiting groove.

6. The microphone core of a dynamic microphone according to claim 1, characterized in that: The magnetic circuit assembly includes a magnetic cup, a magnet, and a magnetic sheet. The longitudinal cross-section of the magnetic cup is U-shaped. The magnet and the magnetic sheet are both cylindrical. The magnet is located at the center of the bottom surface of the magnetic cup, and the magnetic sheet is located on the top surface of the magnet. The area between the side wall of the magnetic sheet and the inner wall of the magnetic cup is the region where magnetic field lines are dense in the magnetic field.

7. The microphone core of a dynamic microphone according to claim 1, characterized in that: The top of the second bracket is recessed and has a second mounting groove for assembling the magnetic circuit assembly.

8. The microphone core of a dynamic microphone according to claim 7, characterized in that: The inner wall of the second mounting groove extends toward the magnetic circuit assembly and is provided with a plurality of support protrusions. The plurality of support protrusions are evenly distributed along the circumference of the magnetic circuit assembly, and a second vent hole is formed between adjacent support protrusions.

9. The microphone core of a dynamic microphone according to any one of claims 1-8, characterized in that: The horizontal projection of the dense magnetic field lines in the magnetic field is an annular shape. When the first support and the second support are assembled as a whole, the horizontal projection of the coil is circular. The circle is concentric with the annular circle and the diameter of the circle is between the inner diameter and the outer diameter of the annular circle.

10. The microphone core of a dynamic microphone according to claim 9, characterized in that: The diameter of a circle is the average of the inner and outer diameters of the annulus.

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