Microphone Protection Device

Abstract

An embodiment of the present invention discloses a microphone protection device that can prevent performance degradation and damage of a microphone mounted on a mobile device, vehicle, etc., from instantaneous high-pressure compressed air, high-pressure jetted liquid, etc. The disclosed microphone protection device includes an appliance that supports a microphone and has a through hole connected to a sound inlet of the microphone and a mounting space for mounting a protection device, an inner plate that is mounted in the mounting space of the appliance and has a sound hole formed in the center, an outer plate that is mounted in the mounting space of the appliance and has a plurality of sound holes formed on its outer circumferential surface, and a plurality of springs disposed between the inner plate and the outer plate, and in a normal state, the inner plate and the outer plate are separated by the springs to form an acoustic passage, and when high-pressure compressed air or jetted liquid flows in, the outer plate comes into close contact with the inner plate, closing the acoustic passage.

Description

[Technical field]

[0001] The present invention relates to a microphone protection device, and more particularly to a microphone protection device that can prevent performance degradation and damage to microphones mounted on mobile devices, vehicles, etc. from momentary high-pressure compressed air or high-pressure jets of liquid. [Background technology]

[0002] Generally, microphones operate by vibration of a diaphragm that responds sensitively to sound pressure, and have a structure in which foreign matter can easily enter through the sound path leading to the diaphragm. Therefore, microphones are usually protected by installing a screen at the entrance of the sound path to prevent the inflow of foreign matter.

[0003] However, since microphones mounted on mobile devices and vehicles are easily exposed to harsh external environments such as instantaneous high-pressure compressed air or high-pressure liquid jets, they cannot be protected by conventional screens alone, resulting in problems such as damage to the diaphragm or deterioration of performance. That is, when instantaneous high-pressure compressed air or liquid jets are generated in the finished product assembly process, user environment, or vehicle driving environment where the microphone is used, the microphone diaphragm is affected, resulting in deterioration of performance or defects such as silence. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a microphone protection device for preventing deterioration of microphone performance and damage caused by instantaneous compressed air, high-pressure water spray, dust while driving, etc. in microphones mounted on mobile devices and vehicles. [Means for solving the problem]

[0005] An embodiment of the present invention discloses a microphone protection device to be mounted on a mobile device, a vehicle, etc. The disclosed protection device includes an appliance having a through hole connected to a sound inlet of the microphone while supporting the microphone and a mounting space for mounting the protection device, an inner plate mounted in the mounting space of the appliance and having a sound hole formed in the center, an outer plate mounted in the mounting space of the appliance and having a plurality of sound holes formed on its outer periphery, and a plurality of springs disposed between the inner plate and the outer plate, and in a normal state, the inner plate and the outer plate are separated by the springs to form an acoustic passage, and when high-pressure compressed air or a jet of material flows in, the outer plate comes into close contact with the inner plate to close the acoustic passage.

[0006] The microphone protection device may further include an acoustic filter made of sealing rubber and mesh disposed on the outside of the inner plate, and the fixture is a fixture for mounting a microphone assembly on a mobile device or a vehicle. Effect of the Invention

[0007] According to an embodiment of the present invention, it is possible to prevent the diaphragm from being damaged or its performance from being degraded by high-pressure sprayed water or compressed air in a microphone module for a mobile device or a vehicle, and to prevent the diaphragm from being damaged by dust that flows in while driving. [Brief description of the drawings]

[0008] [Figure 1] 1 is an example in which a microphone protection device according to an embodiment of the present invention is applied to a mobile device. [Diagram 2] 1 is an example in which a microphone protection device according to an embodiment of the present invention is applied to a vehicle. [Diagram 3] 1 is an exploded perspective view of a microphone protection device according to an embodiment of the present invention; [Figure 4] 1 is an assembled perspective view of a microphone protection device according to an embodiment of the present invention; [Diagram 5]1 is a perspective cross-sectional view of a microphone protection device according to an embodiment of the present invention in an open state. [Figure 6] 1 is a side cross-sectional view of a microphone protection device according to an embodiment of the present invention in an open state. [Figure 7] 1 is a perspective view of a microphone protection device according to an embodiment of the present invention in a closed state; [Figure 8] 1 is a perspective cross-sectional view of a microphone protection device according to an embodiment of the present invention in a closed state. [Figure 9] 1 is a side cross-sectional view of a microphone protection device according to an embodiment of the present invention in a closed state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention and the technical problems achieved by the implementation of the present invention will be more apparent from the preferred embodiments of the present invention described below. The following examples are merely illustrative for explaining the present invention, and are not intended to limit the scope of the present invention.

[0010] FIG. 1 shows an example in which a microphone protection device according to an embodiment of the present invention is applied to a mobile device, and FIG. 2 shows an example in which a microphone protection device according to an embodiment of the present invention is applied to a vehicle.

[0011] 1 and 2, the microphone protection device 100 of the present invention is disposed in the mounting spaces 32a, 42a of the through-holes 32, 42 formed in the appliance 30, 40 of a mobile device or vehicle on which the microphone assembly 10 is mounted, and functions to protect the microphone assembly 10 from high-pressure compressed air and liquids that instantaneously flow into the microphone side from the outside of the mobile device or vehicle through the through-hole 32, 42. In the embodiment of the present invention, in the appliance 30, 40 on which the microphone protection device 100 is mounted, the microphone side is defined as the inside and the sound source side is defined as the outside.

[0012] 1 and 2, a microphone assembly 10 is mounted on a PCB board 20 and receives sound input through a sound hole 22 of the PCB board, and a screen 24 for preventing foreign matter from entering may be installed between the sound hole 22 of the PCB board and the fixtures 30 and 40. The microphone assembly 10 is a typical microphone including a diaphragm, and converts vibrations of the diaphragm into an electrical signal.

[0013] A linear through hole 32 is formed in the mobile device fixture 30, and the protection device 100 is mounted in the mounting space 32a on the inner side of the fixture 30, and an L-shaped through hole 42 is formed in the vehicle fixture 40, and the protection device 100 is mounted in the mounting space 42a on the outer side, so that the protection device 100 is prevented from falling off by an additional vehicle fixture 50. At this time, the through holes 32, 42 of the fixtures that act as sound passages are formed as cylindrical holes with small diameters, and the diameter of some of them is expanded to form the mounting spaces 32a, 42a so that the protection device 100 can be mounted therein.

[0014] In the microphone assembly 10 mounted on a mobile device with such a structure, in the normal state (open state), sound pressure generated from an external sound source is transmitted to the inlet through the through hole 32 of the fixture 30, the protection device 100, and the screen 24, and the internal diaphragm vibrates due to this sound pressure to generate an audio signal. Also, in the microphone assembly 10 mounted on a vehicle, in the normal state (open state), sound pressure generated from an external sound source is transmitted to the inlet through the through hole 52 of the secondary fixture 50, the through hole 42 of the fixture 40, the protection device 100, and the screen 24, and the internal diaphragm vibrates due to this sound pressure to generate an audio signal.

[0015] In the unlikely event that high-pressure compressed air or jet liquid suddenly flows into the through holes 32, 42 from the outside, the protective device 100 of an embodiment of the present invention can operate to protect the microphone assembly 10 by blocking the inflow of high-pressure compressed air or jet liquid.

[0016] As described above, the microphone protection device 100 according to the embodiment of the present invention is structured to close the opened acoustic passage P1 in response to compressed air or liquids that tend to move in a straight line, and after closing the opened acoustic passage, when the compressed air or liquid disappears, the acoustic passage can be restored to a normal state (open state) by the restoring force of the spring. At this time, a mesh is applied to the acoustic passage P1 to prevent the inflow of dust and moisture, thereby preventing damage to the microphone and deterioration of its performance.

[0017] FIG. 3 is an exploded perspective view of a microphone protection device according to an embodiment of the present invention, and FIG. 4 is an assembled perspective view of the microphone protection device according to the embodiment of the present invention.

[0018] As shown in Figures 3 and 4, the microphone protection device 100 according to the embodiment of the present invention has an outer plate 110 with a closed center and an acoustic hole formed on the outer periphery, an inner plate 130 with a spring mounting groove formed on the outer periphery and an acoustic hole formed in the center, and a spring 120 disposed between the inner plate 130 and the outer plate 110, which are mounted in the mounting space 32a, 42a of the appliance. At this time, an acoustic filter 140 for preventing foreign matter from entering the microphone 10 through the acoustic hole 134 formed in the center may be further provided on the outer side of the inner plate 130. The acoustic filter 140 is made of a disk-shaped rubber for sealing with an acoustic hole formed in the center, and a mesh 142 attached to the acoustic hole.

[0019] 3 and 4, the outer plate 110 is disc-shaped, with a closed center 116 and alternating acoustic holes 114 and support protrusions 112 formed on the outer periphery. The acoustic holes 114 are acoustic passages for transmitting sound from an external sound source to the inside, and the protrusions 112 protruding outward secure a space with the outside to prevent the acoustic holes 114 formed on the outer periphery from being blocked.

[0020] The springs 120 are inserted into a plurality of spring mounting grooves 132 formed in the outer plate 110 and the inner plate 130, respectively, to form a space between the outer plate 110 and the inner plate 130, so that sound flowing in through the sound hole 114 of the outer plate is transmitted to the microphone assembly 10 through the sound hole 134 formed in the center of the inner plate 130. When high-pressure compressed air or liquid is instantly ejected from the outside, the springs 120 are compressed by the outer plate 110, so that the outer plate 110 and the inner plate 130 come into close contact with each other, and the sound hole 114 formed on the outer periphery of the outer plate 110 is blocked by the inner plate 130, thereby blocking the transmission of high-pressure compressed air or liquid to the microphone 10.

[0021] The inner plate 130 is a circular plate having a sound hole 134 formed in the center, and has a plurality of grooves 132 formed on the outer circumferential surface for fixing one end of the spring 120 thereto.

[0022] The acoustic filter 140 is a sealing plate made of a silicon-based material with an acoustic hole formed in the center, and a mesh 142 is attached to the acoustic hole to prevent the inflow of foreign matter.

[0023] In the microphone protection device 100 according to the embodiment of the present invention configured as described above, in a normal state, as shown in Figures 5 and 6, the outer plate 110 and the inner plate 130 are separated by the spring 120, and when high-pressure compressed air or a jet of liquid flows in rapidly from the outside, the outer plate 110 comes into close contact with the inner plate 130, as shown in Figures 7 to 9, to close the acoustic path P2 and protect the microphone assembly 10. When the high-pressure compressed air or a jet of liquid from the outside disappears, the outer plate 110 moves away from the inner plate 130 due to the elastic force of the spring 120, restoring the normal state in which the acoustic path P1 is formed.

[0024] Figure 5 is an oblique cross-sectional view of a microphone protection device of an embodiment of the present invention in an open state, Figure 6 is a side cross-sectional view of a microphone protection device of an embodiment of the present invention in an open state, Figure 7 is an oblique cross-sectional view of a microphone protection device of an embodiment of the present invention in a closed state, Figure 8 is an oblique cross-sectional view of a microphone protection device of an embodiment of the present invention in a closed state, and Figure 9 is a side cross-sectional view of a microphone protection device of an embodiment of the present invention in a closed state.

[0025] In a normal state where no high pressure compressed air or jets are generated, as shown in Figures 5 and 6, the spring 120 expands to maintain a gap between the outer plate 110 and the inner plate 130. As a result, an acoustic passage P1 is formed that connects the acoustic hole 114 in the outer plate 110, the space between the outer plate 110 and the inner plate 130 maintained by the spring 120, and the acoustic hole 130 formed in the center of the inner plate. Sound pressure generated from an external sound source is transmitted to the diaphragm of the microphone 10 through the acoustic passage P1.

[0026] When high-pressure compressed air or jet liquid flows in from the outside, as shown in Figures 7 to 9, high pressure is momentarily applied to the center of the outer plate 110, pressing the spring 120 and bringing the outer plate 110 and the inner plate 130 into close contact, and accordingly, the acoustic hole 114 formed on the outer circumferential surface of the outer plate 110 is blocked by the outer circumferential surface of the inner plate 130, closing the acoustic passage P2 and blocking the inflow of the high-pressure compressed air or jet liquid through the acoustic passage P2 to protect the microphone assembly 10. After that, when the high-pressure compressed air or jet liquid flowing in from the outside disappears, the outer plate 110 returns to its original position due to the elastic force of the spring 120, maintaining a space with the inner plate 130, and the acoustic passage P1 is restored to normal.

[0027] In this way, the microphone protection device 100 according to the embodiment of the present invention opens or closes the acoustic passage P1 through which sound passes, so that factors that may cause performance degradation due to the user or driving environment are not directly transmitted to the microphone 10. That is, the microphone protection device 100 according to the embodiment of the present invention transmits normal sound to the diaphragm of the microphone 10 through the acoustic passage P1 formed in the appliance using a spring structure, and blocks factors that cause performance degradation that occur momentarily by closing the open acoustic passage P2, thereby enabling the microphone 10 to be used more stably.

[0028] Although the present invention has been described with reference to one embodiment shown in the drawings, those skilled in the art will recognize that various modifications and equivalent alternative embodiments are possible.

Claims

1. a device that supports the microphone and has a through hole connected to an inlet of the microphone and a mounting space for mounting a protection device; an inner plate mounted in the mounting space of the appliance and having a sound hole formed at the center; an outer plate mounted in the mounting space of the appliance and having a plurality of sound holes formed on an outer peripheral surface thereof; a plurality of springs disposed between the inner plate and the outer plate; A microphone protection device characterized in that in a normal state, the spring separates the inner plate and the outer plate to form an acoustic passage, and when high-pressure compressed air or a jet of air flows in, the outer plate comes into close contact with the inner plate, closing the acoustic passage.

2. The microphone protection device comprises:

2. The microphone protection device according to claim 1, further comprising an acoustic filter made of sealing rubber and mesh disposed on the outer side of the inner plate.

3. The said equipment is 3. The microphone protection device according to claim 1, which is a device for mounting a microphone assembly on a mobile device or a vehicle.

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