Diaphragm assembly for condenser microphone and condenser microphone

Abstract

The embodiment of the utility model provides a diaphragm assembly for a capacitor microphone and the capacitor microphone. The diaphragm assembly for the capacitor microphone comprises an inner diaphragm ring (1), an outer diaphragm ring (2) and a diaphragm (3), the inner membrane ring (1) is provided with a first port (11), a second port (12) and a first peripheral side (13); the outer membrane ring (2) is provided with a third port (21), a first bottom surface (22) and a second peripheral side (23) connected to the first bottom surface (22); the diameter of the diaphragm (3) is greater than that of the outer wall of the outer diaphragm ring (2); the diaphragm (3) is flatly laid on the inner wall of the second port (12); the inner membrane ring (1) is arranged in the outer membrane ring (2) in a sleeved mode, the second port (12) is pressed on the flatly-laid membrane (3) and tightly presses the membrane (3), and the outer wall of the first peripheral side (13) and the inner wall of the second peripheral side (23) are attached together in an interference fit mode. The inner membrane ring and the outer membrane ring can be repeatedly disassembled, assembled and adjusted, and the part loss rate is low.

Description

Technical Field

[0001] This utility model relates to the field of microphone manufacturing, specifically to a diaphragm assembly for a condenser microphone and a condenser microphone. Background Technology

[0002] The diaphragm is a key structure for the operation of a condenser microphone. The diaphragms used in laboratory and standard measurements of condenser microphones are usually made of nickel alloy with a thickness between 1.5 μm and 8 μm. Even slight variations in the diaphragm thickness can affect the microphone's performance. Therefore, the preparation and installation of the diaphragm are also important steps in the microphone manufacturing process.

[0003] The cross-section of a traditional condenser microphone is as follows: Figure 5 As shown, during the manufacturing process, the rear electrode plate 100, the insulating sheet 200 and the outer shell 300 are usually assembled into a component. Then, the diaphragm 400 is fixed on the first diaphragm ring 500 using the corresponding preparation process. Finally, the component is fixed to the outer shell component described above by threads.

[0004] Currently, common diaphragm fabrication processes include electroplating and welding. Electroplating involves fixing the microphone diaphragm ring to a diaphragm fixture and immersing it in an electrolyte solution (such as...). Figure 6 As shown, a thin nickel alloy film is electroplated onto the upper surfaces of the second diaphragm ring 600 and the diaphragm fixture 700 of the microphone based on the principle of electrolysis. After removing the fixture, the formed diaphragm assembly is obtained. Theoretically, the electrolytic plating process can adjust the diaphragm thickness by controlling the electrolysis time and electrolyte concentration. However, electroplated diaphragms are prone to uneven thickness, and the actual thickness of the finished product is difficult to measure. Defective finished products must be scrapped entirely, and the diaphragm ring cannot be recycled and reused, which increases the microphone's production cost. Furthermore, the electroplating process also presents environmental pollution problems related to the plating solution.

[0005] The welding method refers to sandwiching a finished nickel alloy diaphragm between two inner and outer membrane rings or covering a single membrane ring, and fixing the diaphragm to the metal membrane ring by ring laser spot welding. The welding method uses a finished thin film, and the diaphragm thickness is easier to control and inspect than the electroplating method. The disadvantage of this method is that it has high requirements for welding process. The weld points must be evenly distributed and stable. If there is a poor weld, it may cause problems such as diaphragm damage and air leakage during the use of the microphone.

[0006] Therefore, based on the defects and problems existing in the manufacturing of traditional diaphragm components, it is necessary to innovate a diaphragm for capacitor microphones that is both practical and reliable, and more environmentally friendly. Utility Model Content

[0007] This embodiment provides a diaphragm assembly and a condenser microphone for use in a condenser microphone, which can solve the technical problems in the prior art.

[0008] To achieve the above objectives, on the one hand, this utility model provides a diaphragm assembly for a condenser microphone, the diaphragm assembly for the condenser microphone including an inner diaphragm ring, an outer diaphragm ring, and a diaphragm;

[0009] The inner membrane ring has a first port, a second port, and a first peripheral side, with the first port and the second port respectively located at the upper end and the bottom of the first peripheral side;

[0010] The outer membrane ring has a third port, a first bottom surface, and a second peripheral side connected to the first bottom surface. The first bottom surface and the third port are respectively located at the upper end and the bottom of the first bottom surface.

[0011] The diameter of the diaphragm is larger than the outer wall diameter of the outer membrane ring;

[0012] The diaphragm is laid flat on the inner wall of the second port;

[0013] The inner membrane ring is fitted inside the outer membrane ring, the second port presses against the flat membrane sheet and tightens the membrane sheet, the inner wall diameter of the outer membrane ring and the outer wall diameter of the inner membrane ring are interference fit dimensions, the outer wall of the first circumference and the inner wall of the second circumference are fitted together by interference fit, and the first port and the third port have the same orientation.

[0014] Preferably, the inner wall of the first circumferential side has internal threads.

[0015] Preferably, the first port and the third port are flush.

[0016] Preferably, the first port of the outer wall of the first periphery and the third port of the inner wall of the second periphery are connected by welding.

[0017] Preferably, the center of the first bottom surface has a first sound transmission hole that penetrates the first bottom surface, and the diaphragm is laid flat on the first sound transmission hole and covers the first sound transmission hole.

[0018] Preferably, the inner membrane ring is made of stainless steel, and the outer membrane ring is made of stainless steel.

[0019] On the other hand, this utility model embodiment provides a condenser microphone, including a microphone rear cavity and a diaphragm assembly for a condenser microphone as described above, wherein the microphone rear cavity includes a housing and a cavity that can be enclosed by the housing;

[0020] The inner wall of the inner membrane ring is fitted onto the outer wall of the outer shell from the bottom end of the outer shell, and the membrane is fitted onto the bottom end of the outer shell.

[0021] Preferably, the center of the first bottom surface has a first sound transmission hole that penetrates the first bottom surface;

[0022] The bottom of the outer casing has a second sound transmission hole at its center, which extends through the bottom of the outer casing. The first sound transmission hole and the second sound transmission hole have the same diameter.

[0023] Preferably, the inner wall of the first circumferential side has an internal thread, and the outer wall of the housing above the bottom end of the housing has an external thread that matches the internal thread of the inner wall of the first circumferential side.

[0024] The above technical solution has the following beneficial effects: Since both the inner and outer diaphragm rings are relatively thin, they have a certain deformation allowance. Before the final product debugging stage of the diaphragm assembly, if frequent debugging fails or the diaphragm is improperly installed, the inner and outer diaphragm rings can be repeatedly disassembled and adjusted until a usable diaphragm assembly is formed. While ensuring the controllability of the diaphragm, the process is simplified by reducing the number of steps, achieving reusability of the inner and outer diaphragm rings, reducing component loss rate, and making the diaphragm manufacturing environment of the condenser microphone more controllable. This reduces production costs, improves production efficiency, facilitates the large-scale production of condenser microphones, and does not pollute the environment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the inner membrane ring 1 and the outer membrane ring 2 of this utility model;

[0027] Figure 2 This is a schematic diagram of the installation of the diaphragm assembly of this utility model;

[0028] Figure 3 This is a schematic diagram of the finished diaphragm assembly of this utility model;

[0029] Figure 4 (a) is the diaphragm assembly of this utility model;

[0030] Figure 4 (b) is a schematic diagram of the capacitor microphone of this utility model;

[0031] Figure 5 This is a schematic diagram of a capacitor microphone structure in the prior art;

[0032] Figure 6This is a schematic diagram of a diaphragm manufactured using electroplating in the prior art for a capacitor microphone.

[0033] The reference numerals in the attached figures are as follows:

[0034] 1. Inner diaphragm ring; 2. Outer diaphragm ring; 3. Diaphragm; 11. First port; 4. Microphone rear cavity; 10. Diaphragm assembly;

[0035] 12. Second port; 13. First periphery; 21. Third port; 22. First bottom surface; 23. Second periphery; 41. Outer shell; 42. Cavity;

[0036] 221. First sound transmission hole; 412. Second sound transmission hole;

[0037] 100, Rear electrode plate; 200, Insulating sheet; 300, Outer shell; 400, Diaphragm; 500, First diaphragm ring;

[0038] 600, Second membrane ring; 700, Membrane tire tooling. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, in conjunction with an embodiment of the present invention, a diaphragm assembly for a condenser microphone is provided, the diaphragm assembly for the condenser microphone including an inner diaphragm ring 1, an outer diaphragm ring 2 and a diaphragm 3;

[0041] The inner membrane ring 1 has a first port 11, a second port 12 and a first peripheral side 13, with the first port 11 and the second port 12 respectively located at the upper end and the bottom of the first peripheral side 13;

[0042] The outer membrane ring 2 has a third port 21, a first bottom surface 22 and a second peripheral side 23 connected to the first bottom surface 22. The first bottom surface 22 and the third port 21 are respectively located at the upper end and the bottom of the first bottom surface 22.

[0043] The diameter of the diaphragm 3 is larger than the outer wall diameter of the outer membrane ring 2;

[0044] The diaphragm 3 is laid flat on the inner wall of the second port 12;

[0045] The inner membrane ring 1 is fitted inside the outer membrane ring 2. The second port 12 presses against the flat membrane sheet 3 and tightens the membrane sheet 3. The inner wall diameter of the outer membrane ring 2 and the outer wall diameter of the inner membrane ring 1 are interference fit dimensions. The outer wall of the first peripheral side 13 and the inner wall of the second peripheral side 23 are fitted together by interference fit (i.e., squeezed and fixed). The first port 11 and the third port 21 have the same orientation.

[0046] A condenser microphone is a common type of acoustic-electric transducer, frequently used in various acoustic measurement systems. The working principle of a condenser microphone involves a parallel-plate capacitor formed by a tiny air gap between a diaphragm 3 carrying a polarized charge and the rear plate. When sound waves act on the diaphragm 3, they change the distance between the capacitor plates, causing a change in the capacitor's capacitance and generating an alternating voltage, thus producing a real-time changing electrical signal output.

[0047] Diaphragm 3 is the component that converts external sound signals into electrical signals through vibration. The installation method (press-film process) of the diaphragm assembly of the condenser microphone is as follows: Figure 2 As shown, during installation, the outer diaphragm ring 2 is placed upside down on the mounting table, with the third port 21 facing upwards. A diaphragm 3, larger than the outer wall diameter of the outer diaphragm ring 2, is placed over the third port 21. Then, the inner diaphragm ring 1 is aligned with the outer diaphragm ring 2 and pressed tightly. Because the outer wall diameter of the inner diaphragm ring 1 and the inner wall diameter of the outer diaphragm ring 2 make the contact surfaces (outer wall of the inner diaphragm ring 1 and inner wall of the outer diaphragm ring 2) an interference fit, a certain pressure is applied to the inner diaphragm ring 1 using an installation tool, which can squeeze the inner diaphragm ring 1 into the outer diaphragm ring 2. After assembly, the contact surfaces of the inner diaphragm ring 1 and the outer diaphragm ring 2 are pressed against each other. The mutual stress generated by the mutual compression and deformation fixes the diaphragm 3 between the second port 12 of the inner diaphragm ring 1 and the first bottom surface 22 of the outer diaphragm ring 2. The diaphragm 3 is pressed, fixed, and taut. After installation, the diaphragm assembly can be removed from the mounting table and installed on the relevant housing of the condenser microphone (e.g., Figure 4 As shown in the figure, the finished condenser microphone can be obtained.

[0048] Since both the inner diaphragm ring 1 and the outer diaphragm ring 2 are relatively thin and have a certain deformation allowance, the diaphragm 3 needs to be adjusted before the final product debugging stage of the diaphragm assembly. This adjustment includes adjusting the tightness of the diaphragm 3. If frequent adjustments fail or the diaphragm is improperly installed, the inner diaphragm ring 1 and the outer diaphragm ring 2 can be repeatedly disassembled and adjusted until a usable diaphragm assembly is formed. By ensuring the controllability of the diaphragm 3, fewer steps are taken, simplifying the production process. This enables the reusability of the inner diaphragm ring 1 and the outer diaphragm ring 2, resulting in a low component loss rate and a more controllable diaphragm manufacturing environment for condenser microphones. This reduces production costs, increases production efficiency, and facilitates the large-scale production of condenser microphones. It also does not pollute the environment.

[0049] This technology avoids the technical problems of existing technologies, such as "uneven thickness of electroplated diaphragms, difficulty in measuring the actual thickness of the finished product, the need to scrap unqualified finished products, and the inability to recycle and reuse diaphragm rings, which increases the production cost of microphones. In addition, the electroplating process also causes environmental pollution from the electroplating solution." It also avoids the technical problems of existing technologies, such as "the welding method requires high welding quality, and the weld points must be evenly and firmly distributed. If there is a weak weld, it may lead to diaphragm damage and air leakage during microphone use."

[0050] Preferably, the inner wall of the first peripheral side 13 has internal threads for mounting on the housing 41 of the microphone rear cavity 4.

[0051] Preferably, the first port 11 and the third port 21 are flush, which makes the end of the diaphragm assembly neat and easy to adjust, and facilitates the installation of the diaphragm assembly on the relevant housing of the condenser microphone.

[0052] Preferably, the first port 11 of the outer wall of the first peripheral side 13 and the third port 21 of the inner wall of the second peripheral side 23 are connected by welding.

[0053] Since both the inner membrane ring 1 and the outer membrane ring 2 are relatively thin and have a certain deformation allowance, they can be repeatedly disassembled and adjusted before the final debugging of the diaphragm assembly. After debugging, the inner membrane ring 1 and the outer membrane ring 2 can be completely fixed by welding. The welding points are located between the first port 11 and the third port 21 at the ends of the inner membrane ring 1 and the outer membrane ring 2, so that the diaphragm 3 is more firmly fixed between the inner membrane ring 1 and the outer membrane ring 2. Figure 3 As shown.

[0054] Because the diaphragm 3 is very thin, when the inner diaphragm ring 2 is pressed against the outer diaphragm ring 2, the diaphragm 3 is generally directly cut off by the second port 12 of the inner diaphragm ring 1. Alternatively, if the outer diameter of the diaphragm 3 is too large, causing a portion of the diaphragm 3 to protrude beyond the first port 11 and the third port 21, this portion can be removed. When the first port 11 and the third port 21 are welded together, the remaining portion of the diaphragm 3 between the inner diaphragm ring 1 and the outer diaphragm ring 2 is also secured.

[0055] Preferably, the center of the first bottom surface 22 has a first sound transmission hole 221 penetrating the first bottom surface 22, and the diaphragm 3 is laid flat on the first sound transmission hole 221 and covers the first sound transmission hole 221. The diaphragm 3 laid flat on the first sound transmission hole 221 is the effective diaphragm area. The diameter of the first sound transmission hole 221 is not specified. The overall dimensions of the diaphragm ring assembly are determined according to the IEC microphone standard, and the dimensions are in line with industry standards.

[0056] Preferably, the inner membrane ring 1 is made of nickel alloy, and the outer membrane ring 2 is made of nickel alloy. The inner membrane ring 1 and the outer membrane ring 2 used to fix the diaphragm 3 are made of conventional materials, which makes the process of the diaphragm assembly less difficult to implement and easier to promote.

[0057] like Figure 4 As shown, in conjunction with the embodiments of this utility model, a condenser microphone is also provided, including a microphone rear cavity 4 and a diaphragm assembly 10 for a condenser microphone as described above. The microphone rear cavity 4 includes a housing 41 and a cavity 42 that can be formed by the housing 41.

[0058] The inner wall of the inner membrane ring 1 is fitted onto the outer wall of the outer shell 41 from the bottom end, and the membrane 3 is fitted onto the bottom end of the outer shell 41.

[0059] The diaphragm assembly is matched and installed with the microphone cavity 4 to realize the sound transmission function of the diaphragm 3. Specifically, the inner wall of the diaphragm ring 1 is fitted and attached to the outer wall of the outer shell 41 from the bottom end of the outer shell 41, such as... Figure 4 As shown in (a), the finished condenser microphone can be obtained, as follows: Figure 4 As shown in (b), the frequency response of the finished condenser microphone is then adjusted. Other structures or components of the condenser microphone that are existing technologies (e.g., the rear plate and electret, housing 41 or other housing structures) are protected without modification by this invention.

[0060] Preferably, the center of the first bottom surface 22 has a first sound transmission hole 221 that penetrates the first bottom surface 22;

[0061] The bottom center of the outer shell 41 has a second sound transmission hole 412 that penetrates the bottom of the outer shell 41. The first sound transmission hole 221 and the second sound transmission hole 412 have the same diameter. The purpose is to receive the sound that needs to be received from the outside through the diaphragm 3 and enter the rear cavity 4 of the condenser microphone.

[0062] Preferably, the inner wall of the first peripheral side 13 has an internal thread, and the outer wall of the outer shell 41 above the bottom end of the outer shell 41 has an external thread that matches the internal thread of the inner wall of the first peripheral side 13. When the internal thread of the inner wall of the first peripheral side 13 is screwed into the external thread of the outer wall of the outer shell 41, the diaphragm assembly is installed, thereby realizing the installation of the diaphragm.

[0063] It should be understood that in the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0064] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0065] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0066] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A diaphragm assembly for a condenser microphone, characterized in that, The diaphragm assembly for the condenser microphone includes an inner diaphragm ring (1), an outer diaphragm ring (2), and a diaphragm (3); The inner membrane ring (1) has a first port (11), a second port (12) and a first peripheral side (13), with the first port (11) and the second port (12) respectively located at the upper end and the bottom of the first peripheral side (13); The outer membrane ring (2) has a third port (21), a first bottom surface (22) and a second peripheral side (23) connected to the first bottom surface (22). The first bottom surface (22) and the third port (21) are respectively located at the upper end and the bottom of the first bottom surface (22). The center of the first bottom surface (22) has a first sound transmission hole (221) that penetrates the first bottom surface (22); The diameter of the diaphragm (3) is larger than the outer wall diameter of the outer membrane ring (2); The diaphragm (3) is laid flat on the inner wall of the second port (12); The inner membrane ring (1) is fitted inside the outer membrane ring (2), the second port (12) presses on the flat membrane sheet (3) and presses the membrane sheet (3) tightly, the inner wall diameter of the outer membrane ring (2) and the outer wall diameter of the inner membrane ring (1) are interference fit dimensions, the outer wall of the first peripheral side (13) and the inner wall of the second peripheral side (23) are fitted together by interference fit, and the first port (11) and the third port (21) have the same orientation.

2. The diaphragm assembly for a condenser microphone according to claim 1, characterized in that, The inner wall of the first peripheral side (13) has internal threads.

3. The diaphragm assembly for a condenser microphone according to claim 1, characterized in that, The first port (11) and the third port (21) are aligned.

4. The diaphragm assembly for a condenser microphone according to claim 1, characterized in that, The first port (11) of the outer wall of the first peripheral side (13) and the third port (21) of the inner wall of the second peripheral side (23) are connected by welding.

5. The diaphragm assembly for a condenser microphone according to claim 1, characterized in that, The diameter of the diaphragm (3) is larger than the diameter of the first sound transmission hole (221). The diaphragm (3) is laid flat on the first sound transmission hole (221) and covers the first sound transmission hole (221).

6. The diaphragm assembly for a condenser microphone according to claim 1, characterized in that, The inner membrane ring (1) is made of stainless steel, and the outer membrane ring (2) is made of stainless steel.

7. A condenser microphone, characterized in that, Includes a microphone rear cavity (4) and a diaphragm assembly (10) for a condenser microphone according to any one of claims 1-6, wherein the microphone rear cavity (4) includes a housing (41) and a cavity (42) that can be enclosed by the housing (41); The inner wall of the inner membrane ring (1) is fitted onto the outer wall of the outer shell (41) from the bottom end, and the membrane (3) is fitted onto the bottom end of the outer shell (41).

8. The condenser microphone according to claim 7, characterized in that, The center of the first bottom surface (22) has a first sound transmission hole (221) that penetrates the first bottom surface (22); The bottom of the outer shell (41) has a second sound transmission hole (412) that penetrates the bottom of the outer shell (41), and the first sound transmission hole (221) and the second sound transmission hole (412) have the same diameter.

9. The condenser microphone according to claim 7, characterized in that, The inner wall of the first peripheral side (13) has an internal thread, and the outer wall of the outer shell (41) above the bottom end of the outer shell (41) has an external thread that matches the internal thread of the inner wall of the first peripheral side (13).

Images