A microphone device

Abstract

The present invention provides a microphone device, which relates to the technical field of communication equipment. The microphone device includes: a shell, the shell forms a housing space, and the first end face is provided with an opening, and the second end face opposite to the first end face is provided with at least one first sound-permeable hole; an upper cover, which is snap-fitted with the shell at the opening, and the upper cover is provided with a second sound-permeable hole; a microphone body, which is arranged in the housing space, and through the microphone body, the housing space forms a first cavity and a second cavity, and the first sound-permeable hole is connected to the first cavity; the second sound-permeable hole is connected to the second cavity, and at least one third sound-permeable hole is provided on the microphone body, connecting the first cavity and the second cavity. The present invention ensures that the electroacoustic performance of the microphone meets the requirements, realizes its waterproof characteristics, improves the assembly yield of the microphone, and also improves the quality of the microphone device.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to a microphone device. Background Art

[0002] Electroacoustic devices are key components for the conversion of acoustic and electrical signals, and they play a vital role in the conversion, processing and transmission of sound signals. Dynamic microphones have the highest environmental adaptability and security, and are suitable for communication equipment used in harsh environments. Waterproofness is an important requirement for microphones in this field. How to simplify the glue dispensing position and reduce the number of glue dispensing through structural design, while ensuring that the microphone's electroacoustic performance (including frequency response, sensitivity, etc.) meets the requirements, while ensuring the microphone's waterproofness and improving the microphone assembly yield, is an urgent problem to be solved in this field. Summary of the invention

[0003] The embodiment of the present invention provides a microphone device, which is used to solve the problem that the microphone in the prior art needs to cooperate with other equipment and cannot achieve waterproofing independently.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An embodiment of the present invention provides a microphone device, comprising:

[0006] A shell body, wherein the shell body forms an accommodating space, and a first end surface is provided with an opening, and a second end surface opposite to the first end surface is provided with at least one first sound-transmitting hole;

[0007] An upper cover is snap-fitted with the shell at the opening, and a second sound-permeable hole is formed on the upper cover;

[0008] The microphone body is arranged in the accommodating space, and through the microphone body, the accommodating space forms a first cavity and a second cavity, the first sound-permeable hole is connected to the first cavity; the second sound-permeable hole is connected to the second cavity, and at least one third sound-permeable hole is provided on the microphone body, connecting the first cavity and the second cavity.

[0009] Furthermore, a waterproof membrane is provided at the first sound-permeable hole, and the waterproof membrane covers the entire first sound-permeable hole;

[0010] The waterproof membrane is fixed to the first sound-permeable hole through a waterproof membrane ring.

[0011] Furthermore, the microphone body comprises:

[0012] Magnetic circuit, diaphragm and coil;

[0013] Through the diaphragm, the second cavity forms a third cavity and a fourth cavity;

[0014] The third cavity is connected to the first cavity through the third sound-permeable hole, and the fourth cavity is connected to the second sound-permeable hole.

[0015] Further, the magnetic circuit includes a bracket and a magnetic column disposed in the bracket and fixedly connected to the bracket;

[0016] The bracket is respectively disposed against the side wall and the bottom wall of the shell to form the first cavity;

[0017] The coil is sleeved on the magnetic column;

[0018] The third sound-permeable hole is arranged on the bracket.

[0019] Furthermore, a preset gap is formed between the magnetic column and the inner wall of the bracket, and the coil is arranged in the preset gap.

[0020] Further, the diaphragm is arranged on the magnetic circuit and connected to the coil;

[0021] The microphone body also includes a gasket, which is arranged on the magnetic circuit, and the diaphragm is connected to the magnetic circuit through the gasket.

[0022] Furthermore, a gap between the upper cover and the shell is filled with an adhesive for bonding the upper cover and the shell.

[0023] Furthermore, an annular groove is provided on the magnetic circuit;

[0024] The gasket is disposed in the annular groove;

[0025] The upper cover, the shell, the gasket and the magnetic circuit are bonded together by an adhesive.

[0026] Furthermore, the volume of the first cavity is N times that of the second cavity, where N is greater than or equal to 10.

[0027] Furthermore, the microphone further comprises: at least one terminal, which is arranged outside the housing and connected to the coil.

[0028] The beneficial effects of the present invention are:

[0029] In the above technical solution, the microphone device includes: a shell, the shell forms a storage space, and the first end face is provided with an opening, and the second end face opposite to the first end face is provided with at least one first sound-permeable hole; an upper cover is snapped with the shell at the opening, and the upper cover is provided with a second sound-permeable hole; a microphone body is arranged in the storage space, and through the microphone body, the storage space forms a first cavity and a second cavity, and the first sound-permeable hole is connected with the first cavity; the second sound-permeable hole is connected with the second cavity, and the microphone body is provided with at least one third sound-permeable hole, connecting the first cavity and the second cavity. The above solution of the present invention adds a shell and an upper cover on the basis of the microphone body, which ensures that the microphone body is always in the storage space formed by the shell, and realizes that the microphone device can independently achieve the purpose of waterproofing without relying on other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram showing the structure of a microphone device provided by an embodiment of the present invention;

[0031] Figure 2 FIG. 4 is a frequency response curve of a microphone device actually measured according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1-shell; 11-first sound-permeable hole; 12-waterproof membrane; 13-waterproof membrane ring; 2-upper cover; 21-second sound-permeable hole; 3-magnetic circuit; 31-third sound-permeable hole; 32-bracket; 33-magnetic column; 4-diaphragm; 5-coil; 6-gasket; A-first cavity; B-third cavity; C-fourth cavity; 7-adhesive. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for clarity and brevity, the description of known functions and structures is omitted.

[0035] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] The present invention provides a microphone device to solve the problem that the microphone in the prior art needs to cooperate with other equipment and cannot be waterproof independently.

[0037] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0038] like Figure 1 As shown, an embodiment of the present invention provides a microphone device, comprising:

[0039] A housing 1, wherein the housing forms an accommodating space, and a first end surface is provided with an opening, and a second end surface opposite to the first end surface is provided with at least one first sound-transmitting hole 11;

[0040] An upper cover 2 is snap-fitted with the housing 1 at the opening, and a second sound-permeable hole 21 is formed on the upper cover;

[0041] The microphone body is arranged in the accommodating space, and through the microphone body, the accommodating space forms a first cavity A and a second cavity, the first sound-permeable hole 11 is connected to the first cavity A; the second sound-permeable hole 21 is connected to the second cavity, and at least one third sound-permeable hole 31 is provided on the microphone body, connecting the first cavity A and the second cavity.

[0042] In one embodiment of the present invention, the microphone body is arranged in the accommodation space of the shell, and the accommodation space is divided into a first cavity and a second cavity; a first sound-permeable hole is arranged on the second end face of the shell, and sound can penetrate the first sound-permeable hole, but water cannot pass through the first sound-permeable hole. Sound enters the first cavity through the first sound-permeable hole, and enters the second cavity through the third sound-permeable hole. The above scheme of the present invention adds a shell and an upper cover on the basis of the microphone body, ensuring that the microphone body is always in the accommodation space formed by the shell, and realizing the purpose of independently achieving waterproofing of the microphone device without relying on other equipment.

[0043] It should be noted that the first sound-permeable hole can be in various shapes, or can be a ring shape, as long as sound from the outside can pass through, so that the bass enhancement effect can be achieved; the number of the first sound-permeable holes is not limited to one, and the shape is not limited to the shape of the distance, and can be adjusted according to the specific requirements of the acoustic performance.

[0044] Optionally, a waterproof membrane 12 is provided at the first sound-permeable hole 11, and the waterproof membrane 12 covers the entire first sound-permeable hole 11;

[0045] The waterproof membrane 12 is fixed to the first sound-permeable hole 11 through a waterproof membrane ring 13 .

[0046] It should be noted that sound can penetrate the waterproof membrane, and the waterproof membrane is fixed to the first sound-permeable hole through the waterproof membrane ring.

[0047] In the microphone device of the embodiment of the present invention, the first cavity is isolated from the outside by the waterproof membrane, and water cannot enter the first cavity through the first sound-permeable hole, thereby achieving waterproof performance of the microphone device.

[0048] Optionally, the microphone body comprises:

[0049] Magnetic circuit 3, diaphragm 4 and coil 5;

[0050] Through the diaphragm 4, the second cavity forms a third cavity B and a fourth cavity C;

[0051] The third cavity B is connected to the first cavity A through the third sound-permeable hole 31 , and the fourth cavity C is connected to the second sound-permeable hole 21 .

[0052] In one embodiment of the present invention, the housing, the upper cover, the magnetic circuit, the diaphragm and the coil are coaxial.

[0053] In this embodiment, the first cavity and the third cavity are connected through the third sound-permeable hole. By changing the size of the first cavity and fine-tuning the damping of the third sound-permeable hole, the peaks and valleys of the settable frequency band are increased or decreased, thereby effectively controlling the position and height of the resonance peaks and valleys of the earphone in the mid-frequency range to achieve a better acoustic response and eliminate the lip and dental sounds of the human voice during communication voice. At the same time, the improvement is simple, low-cost, and will not interfere with other frequency bands.

[0054] The second cavity is divided into a third cavity and a fourth cavity by the diaphragm; the third cavity is connected with the first cavity through the third air hole, and external sound enters the first cavity through the first sound-permeable hole, and enters the third cavity through the third sound-permeable hole, and is then received by the diaphragm to form a first sound pressure; the fourth cavity is connected with the outside through the second sound-permeable hole, and sound enters the fourth cavity through the second sound-permeable hole, and is received by the diaphragm to form a second sound pressure; the first sound pressure and the second sound pressure on both sides of the diaphragm form a sound pressure difference, causing the diaphragm to vibrate.

[0055] Optionally, the magnetic circuit 3 includes a bracket 32 ​​and a magnetic column 33 disposed in the bracket 32 ​​and fixedly connected to the bracket 32;

[0056] The bracket 32 ​​is respectively disposed against the side wall and the bottom wall of the housing 1 to form the first cavity A;

[0057] The coil 5 is sleeved on the magnetic column 33;

[0058] The third sound transmission hole 31 is provided on the bracket 32.

[0059] When the microphone device is in a working state, the sound pressure on both sides of the diaphragm constitutes a sound pressure difference, causing the diaphragm to vibrate and driving the coil to vibrate; the coil is sleeved on the magnetic column and cuts the magnetic induction lines generated by the magnetic bead, thereby generating an electromotive force.

[0060] In an embodiment of the present invention, the bracket is in a "ji" shape and is clamped (the "ji" shape is inverted) in the accommodation space of the housing, and is respectively abutted against the side wall and the bottom wall of the housing, forming the first cavity with the housing; a magnetic column is provided inside the bracket, the coil is sleeved on the magnetic column, a third cavity B is formed between the diaphragm and the magnetic circuit, and a fourth cavity C is formed between the diaphragm and the upper cover; here, due to the arrangement of the diaphragm, the third cavity is completely isolated from the external environment, and water will not enter the third cavity; the fourth cavity is communicated with the outside through the second sound transmission hole to realize the output of sound signals. When the fourth cavity is filled with water, the water can be directly discharged through the second sound transmission hole without affecting the normal operation of the microphone.

[0061] It should be noted that the fourth cavity and the second sound transmission hole form a second resonance system, and the second resonance system is a Helmholtz resonance system. By adjusting the diameter, number of the second sound transmission holes and the volume of the fourth cavity, the resonance frequency of the second resonance system is set to 4 kHz to broaden the frequency response range of the microphone, thereby meeting the requirements of the frequency response index.

[0062] As Figure 2 shown, Figure 2 the abscissa in is frequency and the ordinate is the corresponding sensitivity. Figure 2 100 and 300 in are the upper frame line and the lower frame line respectively. In the actual use process, it is necessary to ensure that the actual sensitivity curve 200 is between 100 and 300. The sensitivity curve 200 falls within the required frequency response block diagram from 200 Hz to 4 kHz, and the sensitivity at 1 kHz exceeds 1 mv / Pa, having a very high conversion efficiency. The measured axial discrimination rate of the microphone unit is 24 dB, and the ability to suppress far-field noise is extremely strong. For example, when the diameter and number of the second sound transmission holes are at preset values, the sensitivity curve 200 is at 4 kHz. After adjusting the diameter of the second sound transmission hole to increase and adjusting the number of the second sound transmission holes to increase, the sensitivity curve 200 will be greater than 4 kHz. Similarly, the microphone device of the embodiment of the present invention can adjust the sensitivity by designing the volume of the fourth cavity.

[0063] Optionally, a preset gap is formed between the magnetic column 33 and the inner wall of the bracket 32, and the coil 5 is arranged in the preset gap.

[0064] Preferably, the upper cover and the housing are made of plastic, the diaphragm is made of polyester material, the magnetic beads are magnets, the bracket is made of magnetic conductive material; and the coil is made of enameled copper wire. Of course, in the application process, materials that meet the functions of the above-mentioned devices can be selected according to actual needs, and there is no limitation here.

[0065] Optionally, the diaphragm 4 is disposed on the magnetic circuit 3 and connected to the coil 5;

[0066] The microphone body further includes a gasket 6 , which is disposed on the magnetic circuit 3 , and the diaphragm 4 is connected to the magnetic circuit 3 via the gasket 6 .

[0067] It should be noted that the gasket is made of aluminum or copper. The diameter of the diaphragm can be adjusted by adjusting the width of the gasket. The performance of the diaphragm can be adjusted by adjusting the diameter and thickness of the diaphragm. In one embodiment of the present invention, the diaphragm itself constitutes a first resonance system, and the resonance frequency of the first resonance system is adjusted by adjusting the diameter and thickness of the diaphragm, so that the resonance frequency of the first resonance system is 1kHz, so as to improve the conversion rate of the microphone device to the voice band signal.

[0068] Optionally, a gap between the upper cover 2 and the shell 1 is filled with an adhesive 7 for bonding the upper cover 2 and the shell 1 .

[0069] The microphone device of the embodiment of the present invention is provided with a shell and an upper cover so that the microphone body is located in the accommodation space of the shell. The waterproof function of the microphone device can be achieved by only applying glue once at the gap between the shell and the upper cover.

[0070] Optionally, an annular groove is also provided on the magnetic circuit 3;

[0071] The gasket 6 is arranged in the annular groove;

[0072] The housing 1 , the upper cover 2 , the gasket 6 and the magnetic circuit 3 are bonded together by an adhesive 7 .

[0073] The microphone device of the embodiment of the present invention is provided with the annular groove and the gasket is installed in the annular groove, so that when the shell and the upper cover are glued, the adhesive can flow to the gasket through the gap of the upper cover of the shell, so that the adhesive bonds the shell, the upper cover, the gasket and the magnetic circuit together. The microphone device of the embodiment of the present invention only needs one glue dispensing to achieve the waterproof function of the microphone device, which saves the number of glue dispensing times and simplifies the operation.

[0074] Optionally, the volume of the first cavity A is N times that of the second cavity, where N is greater than or equal to 10.

[0075] In this embodiment, the first cavity is a closed acoustic cavity, and the frequency response of the microphone device in the low frequency band will be limited by the closed acoustic cavity. Therefore, the present invention sets the volume of the first cavity to be larger to weaken this effect. In this embodiment, the volume of the first cavity is one order of magnitude larger than the volume of the second cavity, and the order of magnitude is 10 here, so that the low-frequency characteristics of the microphone device are ensured.

[0076] Optionally, the microphone further includes: at least one terminal, which is arranged outside the housing 1 and connected to the coil 5 .

[0077] The microphone device of the embodiment of the present invention adds an upper cover and a shell on the basis of the microphone body, ensuring that the microphone body is in the first accommodation space to achieve its waterproof purpose. The present invention also adds a sealant to further stabilize its waterproof effect. The present invention ensures that the microphone transmission electroacoustic performance meets the requirements, realizes its waterproof characteristics, improves the assembly yield of the microphone, and also improves the quality of the microphone device.

[0078] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A microphone device, characterized in that: include: A shell body, wherein the shell body forms an accommodating space, and a first end surface is provided with an opening, and a second end surface opposite to the first end surface is provided with at least one first sound-transmitting hole; An upper cover is snap-fitted with the shell at the opening, and a second sound-permeable hole is formed on the upper cover; A microphone body is disposed in the accommodating space, and through the microphone body, the accommodating space forms a first cavity and a second cavity, the first sound-transmitting hole is connected to the first cavity; the second sound-transmitting hole is connected to the second cavity, and at least one third sound-transmitting hole is provided on the microphone body, connecting the first cavity and the second cavity; The microphone body includes a magnetic circuit and a coil; The magnetic circuit includes a bracket and a magnetic column arranged in the bracket and fixedly connected to the bracket; The bracket is respectively disposed against the side wall and the bottom wall of the shell to form the first cavity; The coil is sleeved on the magnetic column; The third sound-permeable hole is arranged on the bracket.

2. The microphone device according to claim 1, characterized in that A waterproof membrane is provided at the first sound-permeable hole, and the waterproof membrane covers the entire first sound-permeable hole; The waterproof membrane is fixed to the first sound-permeable hole through a waterproof membrane ring.

3. The microphone device according to claim 1, characterized in that The microphone body further comprises: Diaphragm; Through the diaphragm, the second cavity forms a third cavity and a fourth cavity; The third cavity is connected to the first cavity through the third sound-permeable hole, and the fourth cavity is connected to the second sound-permeable hole.

4. The microphone device according to claim 1, characterized in that A preset gap is formed between the magnetic column and the inner wall of the bracket, and the coil is arranged in the preset gap.

5. The microphone device according to claim 3, characterized in that: The diaphragm is arranged on the magnetic circuit and connected to the coil; The microphone body also includes a gasket, which is arranged on the magnetic circuit, and the diaphragm is connected to the magnetic circuit through the gasket.

6. The microphone device according to claim 1, characterized in that: The gap between the upper cover and the shell is filled with adhesive for bonding the upper cover and the shell.

7. The microphone device according to claim 5, characterized in that The magnetic circuit is also provided with an annular groove; The gasket is disposed in the annular groove; The upper cover, the shell, the gasket and the magnetic circuit are bonded together by an adhesive.

8. The microphone device according to claim 1, characterized in that The volume of the first cavity is N times that of the second cavity, where N is greater than or equal to 10.

9. The microphone device according to claim 3, characterized in that: The microphone further comprises: at least one terminal, which is arranged outside the housing and connected to the coil.

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