CN116614752A - Infrasonic wave microphone - Google Patents

Abstract

The application relates to an infrasonic wave microphone, and belongs to the technical field of loudspeakers. The sound transmission device comprises a sound transmission frame body, wherein a vibrating diaphragm and a polar plate are fixedly arranged in the sound transmission frame body, the vibrating diaphragm and the polar plate are arranged at opposite intervals, a plurality of acoustic through holes are formed in the polar plate, a plurality of sliding parts are arranged on the polar plate in a sliding manner along the direction perpendicular to the polar plate, and mounting seats are fixedly arranged on the polar plate and correspond to the sliding parts one by one; and a reset piece is arranged in each mounting seat and used for driving each sliding piece to be abutted with the vibrating diaphragm so as to drive the vibrating diaphragm to move and reset in the direction away from the polar plate. When the infrasonic wave is tested, the external sound vibrates the vibrating diaphragm to change the distance between the vibrating diaphragm and the polar plate, so that the induction quantity of charges is changed to obtain an infrasonic wave signal; make slider and vibrating diaphragm butt under the elasticity effect through the piece that resets to make the vibrating diaphragm of deformation reset more easily, thereby make the infrasound signal that obtains when infrasound microphone test more accurate, improved infrasound microphone's life.

Description

Infrasonic wave microphone

Technical Field

The application relates to the technical field of loudspeakers, in particular to an infrasonic wave microphone.

Background

Infrasonic waves are sound waves with a frequency of less than 20 Hz. In nature, marine storms, volcanic eruptions, large merle landings, tsunamis, electric lightning borings, wave hits, water eddies, air turbulence, tornados, magnetic storms, aurora, earthquakes and the like may be accompanied by the occurrence of infrasound waves; in human activities such as nuclear explosion, missile flight, gun firing, ship sailing, car racing, high building and bridge shaking, even like a blower, a stirrer, heavy bass music, even bus and car can generate infrasound waves in high-speed running, researches show that the full frequency band of the infrasound waves has different degrees of harm to human bodies, but the frequency of the infrasound waves is inaudible to human ears, so that the test of the infrasound waves is very important. A Microphone, i.e. a Microphone (Microphone), is a transducer that converts sound into an electronic signal.

At present, an infrasonic wave microphone mainly comprises a sound transmission frame body, a vibrating diaphragm, polar plates and a low-pass filtering module, and the surface of the vibrating diaphragm is driven to vibrate in different amplitudes according to the frequency change of external sound so as to change the distance between the vibrating diaphragm and the polar plates, thereby changing the induction quantity of charges, and the changed electric signals are filtered through the low-pass filtering module so as to obtain infrasonic wave signals.

However, when the diaphragm is in the process of vibrating, the diaphragm can deform to a certain extent, and when the infrasound microphone is used for a certain period of time, the diaphragm is easy to be uneven, so that the infrasound signal error obtained by the infrasound microphone is larger, and the service life of the infrasound microphone is reduced.

Disclosure of Invention

In order to improve the service life of the infrasound microphone, the application provides the infrasound microphone.

The application provides an infrasonic wave microphone, which adopts the following technical scheme:

the utility model provides an inferior sound wave microphone, includes the sound transmission framework, fixed vibrating diaphragm and the polar plate of being provided with in the sound transmission framework, relative interval sets up between vibrating diaphragm and the polar plate, it is provided with a plurality of sliders to slide along the direction of perpendicular polar plate on the polar plate, fixed mount pad that is provided with on the polar plate, mount pad and slider one-to-one, every all be provided with the piece that resets in the mount pad, and each the piece that resets is used for driving each slider and vibrating diaphragm butt to drive vibrating diaphragm to keep away from polar plate direction bending deformation, the acoustics through-hole has been seted up on the polar plate.

By adopting the technical scheme, when the infrasonic wave is required to be tested by using the infrasonic wave microphone, the diaphragm is vibrated by external sound so as to change the distance between the diaphragm and the polar plate, and thus the induction quantity of charges is changed so as to obtain an infrasonic wave signal; make slider and vibrating diaphragm butt under the elasticity effect through the piece that resets to make the vibrating diaphragm of deformation reset more easily, thereby make the infrasound signal that obtains when infrasound microphone test more accurate, improved infrasound microphone's life greatly.

Optionally, the slider includes the sliding block, every all fixedly provided with the bar magnet on the sliding block, every all fixedly provided with ring magnet on the mount pad, just ring magnet's axial perpendicular to polar plate, just the bar magnet wears to locate in the ring magnet, there is the force of mutual repulsion between bar magnet and the ring magnet.

Through adopting above-mentioned technical scheme, wear to establish the bar magnet in annular magnet, through the interact of magnetic force between bar magnet and the annular magnet, the force that exists mutual repulsion between bar magnet and the annular magnet to the frictional resistance that receives when reducing the sliding block and sliding.

Optionally, the one end that the sliding block kept away from the bar magnet is hemispherical, just the arc surface and the vibrating diaphragm butt of sliding block.

By adopting the technical scheme, the end part of the sliding block, which is abutted with the vibrating diaphragm, is in a semicircle shape, so that the abutting part of the sliding block and the vibrating diaphragm is in single-point abutting, and the overlarge contact area caused by the fact that the sliding block abuts against the vibrating diaphragm is avoided, and the vibration wave on the surface of the vibrating diaphragm is disturbed; meanwhile, the friction of the sliding block on the surface of the vibrating diaphragm can be reduced through the hemispherical spherical surface.

Optionally, the inside of the sound transmission frame body is fixedly provided with an elastic ring, one side, away from the sound transmission frame body, of the elastic ring is fixedly provided with a supporting ring, and the vibrating diaphragm is fixedly arranged on the supporting ring.

Through adopting above-mentioned technical scheme, the elastic ring can reduce the influence to the frame body that transmits sound when vibrating diaphragm vibrates to set up the support ring on the elastic ring, thereby reduce the influence of elastic ring to vibrating diaphragm self vibration.

Optionally, the diaphragm includes a first gold-plating film and a second gold-plating film, the first gold-plating film is located at one side of the second gold-plating film close to the polar plate, and the first gold-plating film is fixedly arranged on the support ring; and a limiting ring used for limiting the second gold-plating film on the first gold-plating film is fixedly arranged on the inner side of the sound transmission frame body.

By adopting the technical scheme, the first gold-plating film and the second gold-plating film are matched, so that infrasonic waves in external sound can be better collected; through the cooperation of the limiting ring and the supporting ring, the situation that the first gold-plating film and the second gold-plating film are separated can be reduced.

Optionally, an annular arc bulge is arranged at the edge of the second gold plating film, and the annular arc bulge arches towards a direction far away from the first gold plating film.

By adopting the technical scheme, the annular arc bulge can improve the elastic coefficient of the second gold-plating film, thereby improving the acquisition power of the vibrating diaphragm.

Optionally, the stop collar is fixedly provided with a thread bush, and the sound transmission frame body is provided with an internal thread in threaded fit with the thread bush.

Through adopting above-mentioned technical scheme, the thread bush cooperatees with the internal thread, and the spacing ring that makes can dismantle to fix on the frame body of speaking to make the vibrating diaphragm restriction more convenient in the frame body of speaking.

Optionally, the microphone comprises a shell and a mesh enclosure, wherein the mesh enclosure is covered outside the microphone frame body and the vibrating diaphragm, and one end of the shell is fixedly connected with the mesh enclosure; a circuit board is arranged in the shell, and a low-pass filter module is arranged on the circuit board; the shell is provided with a vent hole at one end of the polar plate, and an electric fan is arranged in the vent hole.

Through adopting above-mentioned technical scheme, set up the ventilation hole on the casing to set up the electric fan in the ventilation hole, with the heat dissipation to the inside of infrasonic wave microphone, effectively protect each electronic component inside the infrasonic wave microphone, further improve the life of infrasonic wave microphone.

Optionally, a mounting sleeve is movably arranged in the vent hole, the mounting sleeve is in clearance fit with the hole wall of the vent hole, and a damping piece is arranged between the mounting sleeve and the hole wall of the vent hole; the electric fan is fixedly arranged in the mounting sleeve.

Through adopting above-mentioned technical scheme, can produce certain vibration when electric fan rotates, set up electric fan in the installation sleeve, vibration that vibration damper greatly reduced the electric fan when rotating produced to reduce the influence to the vibration of vibrating diaphragm in the infrasonic wave microphone.

Optionally, a dust cover is disposed in the vent hole and on a side of the mounting sleeve away from the circuit board.

Through adopting above-mentioned technical scheme, dust cover can reduce the dust in the air and get into in the casing through the ventilation hole to reduce the pollution of dust to the electronic component in the infrasonic wave microphone.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when an infrasonic wave microphone is required to be used for testing an infrasonic wave, the diaphragm is vibrated by external sound so as to change the distance between the diaphragm and the polar plate, and therefore the induction quantity of charges is changed to obtain an infrasonic wave signal; the sliding piece is abutted with the vibrating diaphragm under the action of the elastic force of the resetting piece, so that the deformed vibrating diaphragm is easier to reset, the infrasonic wave signals obtained during the infrasonic wave microphone test are more accurate, and the service life of the infrasonic wave microphone is greatly prolonged;

2. through set up the ventilation hole on the casing to set up the electric fan in the ventilation hole, with the heat dissipation to the inside of infrasonic wave microphone, each electronic component inside the effective protection infrasonic wave microphone further improves the life of infrasonic wave microphone.

Drawings

Fig. 1 is a schematic view of a infrasonic wave microphone according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of an embodiment of the present application, primarily for illustrating the connection of a sound-transmitting frame, diaphragm and plate;

FIG. 3 is an enlarged view of portion A of FIG. 2;

fig. 4 is an enlarged view of a portion B in fig. 2.

Reference numerals illustrate: 1. a sound transmission frame; 2. a vibrating diaphragm; 201. a first gold plating film; 202. a second gold plating film; 3. a polar plate; 4. an acoustic through hole; 5. a slider; 6. a mounting base; 7. a reset member; 8. a magnetic rod; 9. a ring magnet; 10. an elastic ring; 11. a support ring; 12. a limiting ring; 13. annular arc convexity; 14. a thread sleeve; 15. an internal thread; 16. a housing; 17. a mesh enclosure; 18. a circuit board; 19. a low pass filtering module; 20. a vent hole; 21. an electric fan; 22. a mounting sleeve; 23. a shock absorbing member; 24. a dust cover; 25. a power switch; 26. an indicator light; 27. an amplifying module; 28. a signal recording module; 29. a battery cavity; 30. a battery cover; 31. a connecting cylinder; 32. a disk.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1 to 4 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The embodiment of the application discloses an infrasonic wave microphone. Referring to fig. 1 and 2, the infrasound microphone includes a housing 16 and a connection cylinder 31, the housing 16 and the connection cylinder 31 are both cylindrical, one end of the housing 16 is screw-coupled with the connection cylinder 31, and the other end of the housing 16 is detachably coupled with a battery cover 30. The longitudinal length of the casing 16 is greater than half of the total length of the infrasonic wave microphone, so that the volume of the inner cavity of the casing 16 can be increased, and each electronic element can be better installed in the casing 16; the battery cover 30 is screwed to the end of the housing 16, and in other embodiments, the battery cover 30 may be fastened to the end of the housing 16 by a snap fit.

Referring to fig. 1 and 2, the circuit board 18 is fixed in the inner cavity of the casing 16 by using screws, the circuit board 18 is positioned at the end part of the casing 16 close to the connecting cylinder 31, and the cavity of the casing 16 close to the battery cover 30 is a battery cavity 29; the panel is provided with a low-pass filter module 19, an amplifying module 27 and a signal recording module 28. The power supply is connected to the circuit board 18 by mounting the power supply in the battery cavity 29 for powering the low pass filter module 19, the amplification module 27 and the signal recording module 28. Wherein, the power is the battery.

The amplifying module 27 is connected to the low-pass filter module 19, and the signal recording module 28 is connected to the amplifying module 27. The low-pass filter module 19 is a low-pass filter, and is used for filtering other frequencies higher than the infrasonic wave; the amplifying module 27 comprises a micro-power consumption IC chip, and has the functions of signal amplification, impedance conversion and built-in anti-interference filter; the signal recording module adopts a microprocessor, but is not limited to the microprocessor.

Referring to fig. 1 and 2, a power switch 25 and an indicator lamp 26 are mounted on the outside of the case 16, and the power switch 25 and the indicator lamp 26 are connected to the circuit board 18, respectively. Wherein the power switch 25 is used for controlling whether the power supply supplies power to each module in the circuit board 18; the indicator lights 26 are used to indicate whether the modules in the circuit board 18 are energized.

Referring to fig. 2 and 3, in order to dissipate heat from each module on the circuit board 18, a vent hole 20 is formed in the housing 16, a mounting sleeve 22 is movably mounted in the vent hole 20, the mounting sleeve 22 is in clearance fit with the wall of the vent hole 20, and an electric fan 21 is fixed in the mounting sleeve 22 by adopting screws, that is, the electric fan 21 is mounted in the vent hole 20. Wherein, there are two vent holes 20, two vent holes 20 are opposite to the upper and lower surfaces of the circuit board 18 respectively, namely the cold air entering through the vent holes 20 can directly act on each module on the circuit board 18; the electric fan 21 is connected with the circuit board 18, and the on-off of the electric fan 21 can be controlled through the power switch 25. The inside of the infrasound microphone can be radiated through the vent hole 20 and the electric fan 21, and each module inside the infrasound microphone is effectively protected, so that the service life of the infrasound microphone is prolonged.

Referring to fig. 2 and 3, in order to reduce the influence on the vibration of the diaphragm 2 in the infrasonic wave microphone, a damper 23 is installed between the installation sleeve 22 and the wall of the vent hole 20. Wherein, damping member 23 adopts damping spring, and damping spring has eight, and eight damping spring evenly distributed is between the pore wall of installation sleeve 22 and ventilation hole 20, and damping spring's one end adopts welded mode to fix on the lateral wall of installation sleeve 22, and the other end adopts welded mode to fix on the pore wall of ventilation hole 20.

It should be noted that, when the electric fan 21 rotates, a certain vibration is generated, the electric fan 21 is fixed in the mounting sleeve 22, and the vibration generated when the electric fan 21 rotates is greatly reduced by the damping spring, so that the influence on the vibration of the diaphragm 2 in the infrasonic wave microphone is reduced. In other embodiments, the damping member 23 may be made of sponge or soft rubber, and the sponge or soft rubber is directly filled in the outer side wall of the mounting sleeve 22 and the wall of the vent hole 20.

Referring to fig. 2 and 3, in order to further reduce the influence on the vibration of the diaphragm 2 in the infrasonic wave microphone, the two ends of the mounting sleeve 22 are all communicated with corrugated sleeves, the corrugated sleeves are made of rubber, the pipe diameters of the two corrugated sleeves are gradually increased along the direction away from the mounting sleeve 22, and one ends of the two corrugated sleeves away from the mounting sleeve 22 are fixedly connected with the hole wall of the ventilation hole 20. The mounting sleeve 22 is reduced in its axial displacement by the bellows sleeve, so that the influence on the vibration of the diaphragm 2 in the subsonic microphone is reduced.

Referring to fig. 2 and 3, to reduce dust from entering the interior cavity of the housing 16, a dust cover 24 is mounted within the vent hole 20, the dust cover 24 being located on the side of the mounting sleeve 22 remote from the circuit board 18. The dust cover 24 adopts a mesh structure, and the surface of the dust cover 24 away from the mounting sleeve 22 is an arc surface, so that the junction formed by the contact of the outer side surface of the housing 16 and the dust cover 24 is in smooth curve transition. Dust in the air is reduced from entering the housing 16 through the vent holes 20 by the dust cap 24, thereby reducing contamination of the electronics within the infrasonic microphone by the dust.

Referring to fig. 2 and 4, the infrasound microphone further includes a sound transmission frame 1, the sound transmission frame 1 includes an upper ring and a lower ring, the upper ring and the lower ring are both horizontally arranged, and the centers of the upper ring and the lower ring are located on the same vertical line; the vibrating diaphragm 2 is arranged on the outer surfaces of the upper circular ring and the lower circular ring, the polar plates 3 opposite to the vibrating diaphragm 2 are fixed on the inner surfaces of the upper circular ring and the lower circular ring by bolts, namely the vibrating diaphragm 2 and the polar plates 3 are fixed in the sound transmission frame body 1, and the vibrating diaphragm 2 and the polar plates 3 are arranged at opposite intervals. The lower ring is fixed at one end of the connecting cylinder 31 far away from the shell 16 by adopting screws, and the polar plate 3 is connected with the low-pass filtering module 19.

In this embodiment, the diaphragm 2 and the polar plate 3 are both in annular cylindrical shape, and the diaphragm 2 and the polar plate 3 cooperate to form a cylindrical capacitor pick-up head. The sound transmission frame body 1 is an insulator, which ensures that the vibrating diaphragm 2 and the polar plate 3 are opposite but not connected, thereby meeting the definition of capacitance. The sound transmission frame body 1 can be made of plastic with certain strength, the polar plate 3 is made by coating a layer of electret material on the outer side of a metal plate, and a plurality of acoustic through holes 4 are uniformly formed in the polar plate 3. The metal plate material in the electrode plate 3 can be copper or aluminum alloy.

The electrode plate 3 is used as an electrode of the capacitor, and the electret material is electrically polarized by direct-current high-voltage discharge, so that the electrode plate 3 becomes a charged body, and the electrode plate 3 becomes an always-charged electrode plate 3. The effect through the acoustic through holes 4 is to reduce the air pressure damping generated when the vibrating diaphragm 2 vibrates, so as to ensure the low-frequency acoustic characteristics of the vibrating diaphragm, if the acoustic through holes 4 are not provided, an air spring is formed between the vibrating diaphragm 2 and the polar plate 3 when the vibrating diaphragm 2 vibrates, thereby influencing the maximum amplitude of the vibrating diaphragm 2 and reducing the sensitivity of low-frequency pickup.

Referring to fig. 2 and 4, an elastic ring 10 is fixedly disposed on the inner side of the sound transmission frame 1, a supporting ring 11 is fixedly disposed on one side of the elastic ring 10 away from the sound transmission frame 1, and the diaphragm 2 is fixedly disposed on the supporting ring 11. Wherein, the elastic ring 10 is made of elastic plastic material, in other embodiments, the elastic ring 10 may be made of elastic steel material, and the cross section of the elastic ring 10 is semicircular; the supporting ring 11 is an insulator, and the supporting ring 11 may be made of plastic with certain strength. In this embodiment, the influence on the sound transmission frame 1 when the diaphragm 2 vibrates can be reduced by the elastic ring 10, and the supporting ring 11 is arranged on the elastic ring 10, so that the influence of the elastic ring 10 on the vibration of the diaphragm 2 itself is reduced.

Referring to fig. 2 and 4, the diaphragm 2 includes a first gold-plating film 201 and a second gold-plating film 202, the first gold-plating film 201 is located at one side of the second gold-plating film 202 near the electrode plate 3, and the first gold-plating film 201 is fixedly disposed on the support ring 11; a stopper ring 12 for restricting the second gold plating film 202 to the first gold plating film 201 is fixedly provided on the inner side of the sound transmission housing 1. The first gold-plating film 201 and the second gold-plating film 202 are both made by evaporating a gold film on the outer side of an engineering plastic film, the gold film is a gold film with extremely thin thickness, and the engineering plastic film in the diaphragm 2 can be made of PPS or PTEF; the limiting ring 12 is an insulator, and the limiting ring 12 can be made of plastic with certain strength.

The first gold plating film 201 and the second gold plating film 202 have a dual function, namely, they receive external sound waves to generate vibration; and secondly, the electrode is used as an electrode to form a capacitor with the polar plate 3. The first gold-plating film 201 and the second gold-plating film 202 are matched, so that infrasonic waves in external sound can be better collected; by the cooperation of the stopper ring 12 and the support ring 11, the occurrence of separation of the first gold plating film 201 from the second gold plating film 202 can be reduced.

Referring to fig. 2 and 4, the edge of the second gold plating film 202 is provided with an annular arc protrusion 13, the annular arc protrusion 13 arches in a direction away from the first gold plating film 201, and the annular arc protrusion 13 and the second gold plating film 202 are integrally heat-pressed. The limiting ring 12 is fixedly connected with a thread sleeve 14, and the sound transmission frame body 1 is provided with an internal thread 15 in threaded fit with the thread sleeve 14. In this embodiment, the elastic coefficient of the second gold-plating film 202 can be increased by the annular arc protrusion 13, so as to increase the collection power of the diaphragm 2; through the cooperation of thread bush 14 and internal thread 15, the spacing ring 12 that makes can dismantle and fix on the frame body 1 that ventilates to make vibrating diaphragm 2 restriction more convenient in the frame body 1 that ventilates.

Referring to fig. 2 and 4, a plurality of sliding parts 5 are slidably arranged on the pole plate 3 along the direction perpendicular to the pole plate 3, and mounting seats 6 are fixedly arranged on the pole plate 3, wherein the mounting seats 6 are in one-to-one correspondence with the sliding parts 5. Wherein the mounting seat 6 is fixed on the surface of the polar plate 3 facing the vibrating diaphragm 2 by using an adhesive. The sliding piece 5 comprises a sliding block, one end of the sliding block facing the vibrating diaphragm 2 is in a semicircle shape, and the arc surface of the sliding block is abutted against the first gold-plating film 201. In this embodiment, the end portion of the sliding block abutting against the first gold-plating film 201 is in a semi-spherical shape, so that the abutting position of the sliding block and the first gold-plating film 201 is in single-point abutting against, and the excessive contact area of the sliding block when the sliding block abuts against the first gold-plating film 201 is avoided, and interference is caused to vibration waves on the surface of the first gold-plating film 201; meanwhile, the scratch of the sliding block on the surface of the first gold plating film 201 can be reduced by the hemispherical spherical surface.

Referring to fig. 2 and 4, each sliding block is fixedly provided with a magnetic rod 8, the length direction of the magnetic rod 8 is parallel to the axial direction of the sliding block, the magnetic rods 8 are penetrated into the mounting seats 6, each mounting seat 6 is fixedly provided with a ring magnet 9, the axial direction of each ring magnet 9 is perpendicular to the polar plate 3, and the magnetic rods 8 are penetrated into the corresponding ring magnets 9, so that mutual repulsive force exists between the magnetic rods 8 and the ring magnets 9, friction resistance between the magnetic rods 8 and the ring magnets 9 is reduced, and friction resistance applied to sliding blocks during sliding is reduced.

Referring to fig. 2 and 4, one end of the magnetic rod 8, which is far away from the sliding block, is fixedly connected with a disc 32 by adopting strong glue, and the disc 32 is made of plastic; a reset piece 7 is arranged in each mounting seat 6, the reset piece 7 adopts a reset spring, one end of the reset spring is fixed on the disc 32, and the other end is fixed on the cavity wall of the inner cavity of the mounting seat 6. In this embodiment, the sliding block is driven to abut against the first gold-plating film 201 by the return spring, so as to drive the first gold-plating film 201 to move and reset in a direction away from the electrode plate 3.

Referring to fig. 2 and 4, the infrasound microphone further includes a mesh cover 17, and the mesh cover 17 is covered outside the sound transmission frame 1 and the diaphragm 2. The mesh enclosure 17 may be formed of two parts or may be integrated. The part of the mesh enclosure 17, which is positioned outside the vibrating diaphragm 2, is cylindrical; the part of the mesh enclosure 17, which is positioned at the end of the diaphragm 2 far away from the connecting cylinder 31, can be in the shape of a disc 32 or can be in other shapes; the outer diameter of the mesh enclosure 17 is the same as the outer diameter of the housing 16. One end of the mesh enclosure 17, which is close to the connecting cylinder 31, is fixed on the connecting cylinder 31 by adopting a screw, and the sound pickup can be facilitated through the mesh enclosure 17, and the polar plate 3, the sound transmission frame body 1 and the vibrating diaphragm 2 can be protected.

The implementation principle of the infrasonic wave microphone provided by the embodiment of the application is as follows: when the infrasonic wave microphone is required to be used for testing the infrasonic wave, the power switch 25 is turned on, and external sound enables the vibrating diaphragm 2 to vibrate so as to change the distance between the vibrating diaphragm 2 and the polar plate 3, and therefore the induction quantity of electric charges is changed. The electrical signal changed on the polar plate 3 is output to the low-pass filtering module 19, when the infrasonic wave signal exists, the low-pass filtering module 19 sends the filtered infrasonic wave signal to the amplifying module 27 to amplify the infrasonic wave signal, and then the signal is sent to the signal recording module 28, so that a relatively pure infrasonic wave signal is obtained.

The sliding block is abutted with the first gold-plating film 201 under the action of the elastic force of the reset spring, so that the deformed first gold-plating film 201 is easier to reset, the infrasonic wave signals obtained during the infrasonic wave microphone test are more accurate, and the service life of the infrasonic wave microphone is greatly prolonged.

The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. Therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. The infrasonic wave microphone comprises a sound transmission frame body (1), wherein a vibrating diaphragm (2) and pole plates (3) are fixedly arranged in the sound transmission frame body (1), the vibrating diaphragm (2) and the pole plates (3) are arranged at opposite intervals, and a plurality of acoustic through holes (4) are formed in the pole plates (3), and the infrasonic wave microphone is characterized in that a plurality of sliding pieces (5) are slidably arranged on the pole plates (3) along the direction perpendicular to the pole plates (3), mounting seats (6) are fixedly arranged on the pole plates (3), and the mounting seats (6) are in one-to-one correspondence with the sliding pieces (5); and a reset piece (7) is arranged in each mounting seat (6), and each reset piece (7) is used for driving each sliding piece (5) to be abutted with the vibrating diaphragm (2) so as to drive the vibrating diaphragm (2) to move and reset in the direction away from the polar plate (3).

2. An infrasonic wave microphone as set forth in claim 1, characterized in that the sliding member (5) comprises sliding blocks, each sliding block is fixedly provided with a magnetic rod (8), each mounting seat (6) is fixedly provided with a ring magnet (9), the axial direction of the ring magnet (9) is perpendicular to the polar plate (3), and the magnetic rods (8) are arranged in the ring magnet (9) in a penetrating manner, so that a mutual repulsive force exists between the magnetic rods (8) and the ring magnet (9).

3. An infrasonic wave microphone as set forth in claim 2, characterized in that the end of the sliding block far away from the magnetic rod (8) is hemispherical, and the arc surface of the sliding block is abutted against the vibrating diaphragm (2).

4. An infrasound microphone according to claim 2, characterized in that the inner side of the sound transmission frame body (1) is fixedly provided with an elastic ring (10), one side of the elastic ring (10) far away from the sound transmission frame body (1) is fixedly provided with a supporting ring (11), and the vibrating diaphragm (2) is fixedly arranged on the supporting ring (11).

5. An infrasonic wave microphone as claimed in claim 4, characterized in that the diaphragm (2) comprises a first gold-plated film (201) and a second gold-plated film (202), the first gold-plated film (201) being located on a side of the second gold-plated film (202) close to the polar plate (3), the first gold-plated film (201) being fixedly arranged on the support ring (11); a limiting ring (12) for limiting the second gold-plating film (202) to the first gold-plating film (201) is arranged on the inner side of the sound transmission frame body (1).

6. An infrasonic wave microphone as claimed in claim 5, characterized in that the edge of the second gold-plated film (202) is provided with an annular arc-shaped bulge (13), the annular arc-shaped bulge (13) being arched away from the first gold-plated film (201).

7. An infrasonic wave microphone as set forth in claim 5, characterized in that a threaded sleeve (14) is fixedly arranged on the limiting ring (12), and an internal thread (15) in threaded fit with the threaded sleeve (14) is arranged on the sound transmission frame body (1).

8. The infrasound microphone according to claim 1, further comprising a housing (16) and a mesh enclosure (17), wherein the mesh enclosure (17) is covered outside the sound transmission frame body (1) and the vibrating diaphragm (2), and one end of the housing (16) is fixedly connected with the mesh enclosure (17); a circuit board (18) is arranged in the shell (16), and a low-pass filter module (19) is arranged on the circuit board (18); a vent hole (20) is formed in the shell (16) and located at the circuit board (18), and an electric fan (21) is arranged in the vent hole (20).

9. An infrasound microphone according to claim 8, characterized in that the vent hole (20) is movably provided with a mounting sleeve (22), and the mounting sleeve (22) is in clearance fit with the hole wall of the vent hole (20); damping parts (23) are arranged between the mounting sleeve (22) and the hole wall of the vent hole (20), and the electric fan (21) is fixedly arranged in the mounting sleeve (22).

10. An infrasound microphone according to claim 9, characterized in that a dust cover (24) is provided in the vent hole (20) on the side of the mounting sleeve (22) remote from the circuit board (18).