Sound guide rear seat of condenser microphone and condenser microphone

Abstract

The utility model discloses a sound guide rear seat of a condenser microphone and the condenser microphone, and particularly relates to the sound guide rear seat of the condenser microphone and the condenser microphone comprising the sound guide rear seat, the sound guide rear seat comprises a conical head, a base and two identical connecting parts, the conical head is a rotating body; the base is a hollow cylinder; the conical head and the base have the same rotating central axis; the first end of the base is connected with the conical head, and the second end of the base is connected with the two connecting parts. The condenser microphone is provided with the sound guide rear seat, so that the focusing and diffusion degree and direction of rear incoming sound can be changed, the frequency response characteristic of the condenser microphone can be improved, the directional characteristic can be optimized, the comb filtering effect and the sidelobe phenomenon can be inhibited, howling is reduced, and the condenser microphone has the advantages of simple structure, easiness in assembly, good acoustic performance and the like.

Description

Technical Field

[0001] The utility model relates to the field of acoustic equipment, in particular to a sound-conducting back seat of a condenser microphone and the condenser microphone. Background Art

[0002] Condenser microphones have the characteristics of high sensitivity, wide bandwidth, wide dynamic range, and good transient characteristics, and have been widely used. The directivity of a condenser microphone refers to the characteristic that the sensitivity of the microphone changes with the incident direction of the sound wave. When the directivity of a condenser microphone is weak, there is a problem of howling in the sound reinforcement system, especially handheld condenser microphones are very prone to howling failures in the sound reinforcement environment of live performances.

[0003] The structure of the main components of the existing condenser microphone is as follows: Figure 1 As shown, it mainly includes a housing 010 and a sound head 020. The sound head 020 is located in the center of the cavity inside the housing 010, and the cavity can be specifically divided into a front cavity 011, a side cavity 012 and a rear cavity 013 with reference to the upper surface plane and the lower surface plane of the sound head 020. The rear cavity 013 of the existing condenser microphone has not been specially designed. The simple hollow cavity is prone to resonance, and the solid cavity reduces the sound transmission rate of the rear sound, which will have an adverse effect on the acoustic characteristics of the microphone, causing a certain degree of weakening of directivity, comb filtering effect and side lobe phenomenon, etc. Utility Model Content

[0004] In view of this, the utility model proposes a sound-conducting back seat of a condenser microphone and a condenser microphone, which can solve the above-mentioned existing technical problems. The utility model provides the following technical solutions:

[0005] A sound-conducting back seat of a condenser microphone comprises a cone head, a base, and two identical connecting parts, wherein: the cone head is a rotating body; the base is a hollow cylinder; the cone head and the base have the same central axis of rotation; the first end of the base is connected to the cone head, and the second end of the base is connected to the two connecting parts.

[0006] Optionally, the rotating body is a concave cone.

[0007] Optionally, the rotating body is a convex cone.

[0008] Optionally, the convex cone satisfies: a cross-section through the rotation center axis is made to obtain a contour line of the convex cone, and the contour line conforms to the power rate curve formula: y = εx m , where the central axis of rotation is the y-axis, the projection of the base radius of the convex cone is the x-axis, ε is the coefficient, and m is the power exponent.

[0009] Optionally, m=2, ε=1.

[0010] A condenser microphone comprises a shell, wherein the interior of the shell has a front cavity, a side cavity and a rear cavity, and is characterized in that the condenser microphone also comprises the sound-conducting back seat of the utility model, wherein the sound-conducting back seat is located in the rear cavity, wherein the lower end of the rear cavity is provided with a first bottom plate and a second bottom plate extending from the inner walls on both sides of the shell to the interior of the shell, wherein the connecting portion has a longitudinally extending support leg and a limiting portion connected to the lower end of the support leg, wherein the support leg is located in the gap between the first bottom plate and the second bottom plate, and the limiting portion interacts with the first bottom plate and the second bottom plate to prevent the sound-conducting back seat from moving along the axial direction of the condenser microphone.

[0011] Optionally, it further includes: a top net support, the top net support is located in the front cavity, the top net support includes a plurality of hollow side panels, and the plurality of side panels are surrounded in a cylindrical shape.

[0012] Optionally, the hollowing rate of the top mesh support is 40% to 60%.

[0013] Optionally, the top net support includes four arched side panels of the same shape.

[0014] Optionally, a surface of at least one of the front cavity, the side cavity and the rear cavity is covered with a sound absorbing material layer; and / or, the rear cavity is filled with a sound absorbing material block.

[0015] According to the technical solution of the utility model, by arranging a sound-conducting rear seat behind the sound head, the focusing, diffusion degree and direction of the rear sound can be changed, thereby improving the frequency response characteristics of the condenser microphone, optimizing the directional characteristics, suppressing the comb filtering effect and the side lobe phenomenon, and having the advantages of simple structure, easy assembly, good acoustic performance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For the purpose of illustration and not limitation, the present invention will now be described according to its preferred embodiments, in particular with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of an existing condenser microphone;

[0018] Figure 2A It is a schematic diagram of a concave sound-conducting rear seat of a condenser microphone of the utility model;

[0019] Figure 2B It is a schematic diagram of a convex sound-conducting rear seat of a condenser microphone of the utility model;

[0020] Figure 2C for Figure 2B Schematic diagram of the cross-sectional profile curve of the convex cone in;

[0021] Figure 3 is a schematic diagram of a solid top mesh support;

[0022] Figure 4 Schematic diagram of the hollow top mesh support.

[0023] In the figure:

[0024] 010, housing; 020, sound head; 011, front cavity; 012, side cavity; 013, rear cavity;

[0025] 21A, concave cone head; 21B, convex cone head; 22, base; 23, connecting part; 231, supporting leg; 232, limiting part;

[0026] 030, solid top net bracket; 031, buckle hole;

[0027] 30. Hollow top net support; 310. Arched side panel; 311. Hollow window; 312. Snap hole. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms such as "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 2A and Figure 2B As shown, the sound-conducting back seat of the condenser microphone of the embodiment of the utility model includes a cone head, a base 22, and two identical connecting parts 23. The cone head can be a rotating body, specifically a concave cone 21A or a convex cone 21B. The base 22 is a hollow cylinder; the hollow part of the base 42 is used to pass through some cables. If there are many cables that need to be passed through, threading holes can also be opened on the cone head. For example, a threading hole is shown on the left side of the upper surface of the concave cone head 21A, and another example is that a threading hole is shown on the right side of the lower surface of the convex cone head 21B. The cone head 21A or 21B and the base 22 have the same central axis of rotation. The first end of the base 22 (i.e., the upper end in the picture) is connected to the cone head, and the second end of the base 22 (i.e., the lower end in the picture) is connected to the two connecting parts 23.

[0031] According to the technical solution of the utility model, by arranging a sound-conducting rear seat behind the sound head, the focusing, diffusion degree and direction of the rear sound can be changed, thereby improving the frequency response characteristics of the condenser microphone, optimizing the directional characteristics, suppressing the comb filtering effect and the side lobe phenomenon, and having the advantages of simple structure, easy assembly, good acoustic performance, etc.

[0032] The convex cone 21B in the sound-conducting rear seat can be specifically designed in the form of a power law curve, which can effectively control the reflection, absorption and scattering of sound. Figure 2C As shown, the convex cone satisfies: the contour line of the convex cone is obtained by making a cross-section through the central axis of rotation, and the contour line conforms to the power rate curve formula: y = εx m , where the rotation center axis is the y-axis, the projection of the base radius of the convex cone is the x-axis, ε is the coefficient, and m is the power index. Optionally, m=2, ε=1.

[0033] The condenser microphone of the embodiment of the utility model comprises a shell, and the interior of the shell comprises a front cavity, a side cavity and a rear cavity. The condenser microphone also comprises a sound-conducting back seat disclosed in the utility model, and the sound-conducting back seat is located in the rear cavity. The lower end of the rear cavity of the shell is provided with a first bottom plate and a second bottom plate extending from the inner walls on both sides of the shell to the inside of the shell (the corresponding picture of the rear cavity of the shell is not shown). Figure 2A and Figure 2B As shown, the connecting portion 23 has a longitudinally extending leg 231 and a limiting portion 232 connected to the lower end of the leg. The leg 231 is located between the first bottom plate and the second bottom plate, and the limiting portion 232 interacts with the first bottom plate and the second bottom plate to prevent the sound guide back seat from moving along the axial direction of the condenser microphone.

[0034] The front cavity of the condenser microphone of the utility model can also include a top mesh support. The top mesh support can be as follows Figure 3 The non-hollow solid top net support 030 shown is a solid plate except for the buckle hole 031, and the other parts of the solid top net support 030 are not permeable to sound waves.

[0035] The top net support can also be a hollow top net support, which includes a plurality of hollow side plates, and the plurality of side plates are surrounded into a cylindrical shape. Figure 4The hollow top net support 30 shown specifically includes four arched side panels 310 of the same shape. These four arched side panels 310 are connected in pairs and enclosed into a square tube. The design has a regular shape and is easy to mold and manufacture. Each arched side panel 310 includes: a sound-transmitting hollow window 311 for sound transmission, and a snap hole 312 for connecting with an external snap. In the arched side panel 310, the lower area is close to the straight bottom edge of the arch, and the upper area is close to the top of the arched arc. The sound-transmitting hollow window 311 can be set in the lower area of ​​the arched side panel 310. The snap hole 312 can be set in the upper area of ​​the arched side panel 310. The sound-transmitting hollow window 111 can include an even number of symmetrically distributed window units. These window units can be arc-shaped. Figure 4 Four arc-shaped window units are shown in the figure, wherein the two upper window units are slightly larger and the two lower window units are slightly smaller, but this is only for example and not limitation.

[0036] The hollowing rate of the hollow top mesh bracket can be 40% to 60%. The hollowing rate is the calculation result of dividing the surface area of ​​the hollow part of the top mesh bracket by the total surface area of ​​the bracket. If the hollowing rate is too small, it will be difficult to improve the side sound and reduce the side sound reflection, and the sound transmission effect will be poor; if the hollowing rate is too large, the mechanical strength is insufficient, and it is easy to be deformed or even damaged by force in the environment.

[0037] In order to further improve product performance, in the condenser microphone of the embodiment of the utility model, the surface of at least one of the front cavity, the side cavity and the rear cavity is covered with a sound absorbing material layer; and / or the rear cavity is filled with a sound absorbing material block. In this way, the sound absorption capacity of the front cavity, the side cavity and the rear cavity can be increased, thereby improving the directional characteristics and reducing the probability of howling of the condenser microphone. The sound absorbing material can specifically be a sound absorbing sponge.

[0038] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A sound-conducting back seat of a condenser microphone, characterized in that: It includes a cone head, a base, and two identical connecting parts, wherein: The cone head is a rotating body; The base is a hollow cylinder; The cone head and the base have the same central axis of rotation; The first end of the base is connected to the cone head, and the second end of the base is connected to the two connecting parts.

2. The sound-conducting back seat of the condenser microphone according to claim 1, characterized in that: The rotating body is a concave cone.

3. The sound-conducting back seat of the condenser microphone according to claim 1, characterized in that: The rotating body is a convex cone.

4. The sound-conducting back seat of the condenser microphone according to claim 3, characterized in that: The convex cone satisfies: a cross-section through the rotation center axis is made to obtain the contour line of the convex cone, and the contour line conforms to the power rate curve formula: y = εx m , where the central axis of rotation is the y-axis, the projection of the base radius of the convex cone is the x-axis, ε is the coefficient, and m is the power exponent.

5. The sound-conducting back seat of the condenser microphone according to claim 4, characterized in that: m=2,ε=1.

6. A condenser microphone, comprising a housing, wherein the housing has a front cavity, a side cavity and a rear cavity, wherein: The condenser microphone further comprises a sound-conducting back seat according to any one of claims 1 to 5, the sound-conducting back seat being located in the back cavity, wherein: The lower end of the rear cavity is provided with a first bottom plate and a second bottom plate extending from the inner walls of both sides of the shell toward the inside of the shell. The connecting portion has a longitudinally extending leg and a limiting portion connected to the lower end of the leg, wherein the leg is located in the gap between the first bottom plate and the second bottom plate, and the limiting portion interacts with the first bottom plate and the second bottom plate to prevent the sound-conducting back seat from moving axially along the condenser microphone.

7. The condenser microphone according to claim 6, characterized in that: Also includes: A top net support is located in the front cavity, and the top net support includes a plurality of hollow side plates, and the plurality of side plates are surrounded in a cylindrical shape.

8. The condenser microphone according to claim 7, characterized in that: The hollowing rate of the top net support is 40% to 60%.

9. The condenser microphone according to claim 7, characterized in that: The top net support comprises four arched side panels of the same shape.

10. The condenser microphone according to claim 6, characterized in that: The surface of at least one of the front cavity, the side cavity and the rear cavity is covered with a sound absorbing material layer; and / or the rear cavity is filled with a sound absorbing material block.

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