Resonator, microphone and vehicle
By introducing an adjustable neck channel and resonant cavity volume into the resonator, the problem of the narrow application scenarios of the resonator is solved, achieving multi-scenario adaptation and high-precision sound acquisition.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-03-27
AI Technical Summary
The application scenarios of resonators are relatively narrow and cannot meet the needs of sound acquisition at different frequencies.
Design a resonator that forms an adjustable neck channel with an adjustable component and housing to flexibly adjust the resonant frequency. Combined with the adjustable volume of the movable resonant cavity, the frequency can be flexibly adjusted.
This expands the application scenarios of resonators, making them suitable for various applications such as consumer electronics, industrial testing, and medical equipment. It also improves the accuracy and sensitivity of sound acquisition and reduces matching costs and maintenance difficulty.
Smart Images
Figure CN121751038A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of resonators, in particular to a resonator, a microphone and a vehicle. BACKGROUND
[0002] A microphone is an energy conversion device for converting a sound signal into an electric signal. The microphone includes a resonator and a sound collection unit, the resonator is used for resonating with a sound wave of a certain frequency and amplifying the sound pressure of the sound wave so that the sound collection unit collects the sound signal.
[0003] However, the use scene of the resonator in the related art is narrow. SUMMARY
[0004] Embodiments of the present application provide a resonator, aiming to enrich the use scene of the resonator.
[0005] In order to achieve the above-mentioned purpose, according to a first aspect of the present application, a resonant cavity is provided, comprising: a housing, provided with a resonant cavity and a through hole in communication with the resonant cavity, the resonant cavity being used for a sound collection unit to collect sound; and an adjusting member provided in the through hole, the adjusting member and the hole wall of the through hole jointly limiting a neck pipe passage in communication with the resonant cavity, the adjusting member being movable relative to the through hole to change the length of the neck pipe passage.
[0006] Optionally, the adjusting member is screwed with the hole wall of the through hole, the adjusting member is provided with a spiral groove, the hole wall of the through hole is provided with a thread, the thread is screwed with the spiral groove, and the thread and the groove wall of the spiral groove have a gap and limit at least part of the neck pipe passage.
[0007] Optionally, the adjusting member is provided with a first passage, one end of the first passage is in communication with the resonant cavity, and the other end is in communication with the environment outside the housing, and the adjusting member is movable relative to the through hole in the hole depth direction of the through hole, so that the length of the first passage located in the through hole is variable.
[0008] Optionally, the resonator further comprises a first gear and a second gear, the first gear is in transmission connection with the adjusting member, the first gear and the second gear are engaged, and the second gear drives the adjusting member to rotate through the first gear.
[0009] Optionally, the first gear and the second gear are provided outside the housing, and the resonator further comprises a first transmission member, the first transmission member connecting the adjusting member and the first gear.
[0010] Optionally, the thicknesses of the first gear and the second gear are different.
[0011] Optionally, the shell comprises a first shell part and a second shell part, the first shell part and the second shell part jointly defining the resonance cavity, the second shell part being movable relative to the first shell part to change the volume of the resonance cavity.
[0012] Optionally, the first shell part and the second shell part are sleeved and slidingly connected.
[0013] According to a second aspect of the present application, a microphone is provided, comprising: the aforementioned resonator; and a sound collecting unit arranged in the resonance cavity.
[0014] According to a third aspect of the present application, a vehicle is further provided, comprising the aforementioned microphone.
[0015] In the resonator of the embodiments of the present application, the adjusting member is movably arranged in the through hole in communication with the resonance cavity and forms a neck pipe passage with the shell in adjustable length, thereby flexibly adjusting the resonance frequency of the resonator and adapting to sound collection of different frequencies. For example, when weak low-frequency sound (such as distant human voice and low-frequency noise of equipment) needs to be collected, the neck pipe passage can be adjusted to be long, the resonance frequency is reduced, and the amplification effect of low-frequency sound waves is enhanced; when high-frequency sound (such as crisp mechanical abnormal sound and high-frequency voice) needs to be collected, the neck pipe passage can be shortened, the resonance frequency is increased, and the amplification ability of high-frequency sound pressure is optimized. The resonator is free from the limitation of "single frequency adaptation", can cover multiple scenarios such as consumer electronics (mobile phone microphone), industrial detection (equipment noise collection), and medical equipment (stethoscope type microphone), and solves the problem of narrow use scenarios.
[0016] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0017] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.
[0018] Figure 1 is the overall structure schematic diagram of the resonator provided in the exemplary embodiments of the present disclosure; Figure 2 is the exploded view of the resonator in Figure 1 ; Figure 3 yes Figure 1 A schematic diagram of the resonator from another perspective; Figure 4 yes Figure 1 Cross-sectional view of the resonator; Figure 5 It is a curve showing the ratio of the air pressure at the placement hole to the incident sound intensity as a function of frequency when the resonator is in its initial state. Figure 6 It is the curve showing the ratio of the incident sound intensity at the placement hole to the frequency when the adjustment component of the resonator is rotated 180° relative to the initial state and the second housing is displaced 20mm relative to the initial state. Figure 7 It is the curve showing the ratio of the incident sound intensity at the placement hole to the frequency when the adjustment component of the resonator rotates 1080° relative to the initial state and the second housing is displaced 100mm relative to the initial state.
[0019] Explanation of reference numerals in the attached figures: 100, Resonator; 200, Housing; 210, First Housing Section; 211, Through Hole; 220, Second Housing Section; 221, Placement Hole; 230, Resonance Cavity; 300, Adjustment Component; 310, Spiral Groove; 410, First Transmission Component; 420, Second Transmission Component; 430, Third Transmission Component; 510, First Gear; 520, Second Gear. Detailed Implementation
[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0021] According to the first aspect of this application, referring to Figures 1 to 4 This disclosure provides a resonator 100. The resonator 100 includes a housing 200 and an adjusting member 300. The housing 200 has a resonant cavity 230 and a through hole 211 communicating with the resonant cavity 230. The resonant cavity 230 is used for sound acquisition by a sound acquisition unit. The adjusting member 300 is disposed in the through hole 211. The adjusting member 300 and the hole wall of the through hole 211 together restrict a neck channel. The neck channel communicates with the resonant cavity 230. The adjusting member 300 can move relative to the through hole 211 to change the length of the neck channel.
[0022] The resonance frequency of the resonator 100 is determined by the "resonance cavity 230 volume" and the "neck pipe passage length" (based on the principle of acoustic resonance, the length of the neck pipe changes directly changes the propagation path and damping of sound waves in the passage, thereby adjusting the resonance frequency). In related technologies, the length of the neck pipe passage is fixed, which causes the resonator 100 to only amplify sound pressure at a specific frequency, which is only suitable for a single scene (such as only collecting high-frequency sound, which cannot adapt to low-frequency scenes); in the present scheme, the adjusting piece 300 is movably arranged in the through hole 211 communicating with the resonance cavity 230, and forms a neck pipe passage with a length-adjustable length with the shell 200, thereby flexibly adjusting the resonance frequency of the resonator 100, and collecting sound of different frequencies. For example: when collecting weak low-frequency sound (such as distant human voice, device low-frequency noise), the length of the neck pipe passage is adjusted to reduce the resonance frequency and enhance the amplification effect of low-frequency sound waves; when collecting high-frequency sound (such as crisp mechanical abnormal sound, high-frequency voice), the length of the neck pipe passage is shortened to increase the resonance frequency and optimize the amplification ability of high-frequency sound pressure. The resonator 100 is free from the limitation of "single frequency adaptation", and can cover multiple scenes such as consumer electronics (mobile phone microphone), industrial detection (device noise collection), medical equipment (stethoscope microphone), etc., solving the problem of narrow use scene.
[0023] The sensitivity of the sound collection unit (such as a microphone or a sound pickup) has frequency characteristics differences, and different models of collection units respond better to sound of a specific frequency. In the present scheme, the adjustability of the length of the neck pipe can actively match the frequency characteristics of the collection unit: for example, if a collection unit has the highest sensitivity to sound of 1kHz-3kHz, the resonance frequency of the resonator 100 can be locked in this interval by adjusting the length of the neck pipe, so that the sound pressure amplified by the resonance cavity 230 coincides with the optimal response frequency band of the collection unit, greatly improving the collection accuracy of the sound signal (reducing the loss of weak signals and reducing the interference of irrelevant frequencies); conversely, if a collection unit with different frequency characteristics is replaced, the entire resonator 100 does not need to be replaced, and the adjustment can be completed by the adjusting piece 300, reducing the matching cost of the collection unit and the resonator 100.
[0024] In some embodiments, the adjusting piece 300 is screwed with the hole wall of the through hole 211.
[0025] Screwing converts rotary motion into linear displacement, and the displacement amount has a precise quantitative correspondence with the rotation angle (determined by the "pitch" of the thread, for example, for a thread with a pitch of 0.5mm, the adjusting piece 300 has a displacement of 0.5mm along the axis of the through hole 211 for each rotation). Thread adjustment can achieve a small and controllable change in the length of the neck pipe by controlling the rotation angle: If the length of the neck pipe needs to be finely adjusted (such as shortening the neck pipe by 0.1mm to match the optimal frequency band of the collection unit), the adjusting piece 300 only needs to be rotated by a corresponding angle (such as 72° for a thread with a pitch of 0.5mm to achieve a displacement of 0.1mm).
[0026] The threaded structure has a self-locking feature, and the adjusting member 300 will not move along the hole depth direction of the through hole 211 without external force twisting, unless the adjusting member 300 is actively rotated.
[0027] In the use of portable devices (such as earphones, handheld recorders), even if the device is shaken or dropped, the adjusting member 300 connected by threads can be firmly locked in the set position, and the situation of "unexpected lengthening / shortening of the neck tube" will not occur, ensuring that the resonance frequency always remains in the preset state, and avoiding sudden distortion of the collected signal; In the industrial detection scene (such as a fixedly installed device noise monitoring microphone), frequent calibration of the position is not required during long-term use, and the locking state of the adjusting member 300 can guarantee the long-term stability of the resonance performance and reduce the maintenance cost in the later period.
[0028] In some embodiments, the adjusting member 300 is provided with a spiral groove 310, the hole wall of the through hole 211 is provided with a thread, the thread is screwed with the spiral groove 310, and the thread and the groove wall of the spiral groove 310 have a gap and limit at least part of the neck tube passage.
[0029] It can be understood that the thread and the groove wall of the spiral groove 310 limit a second passage, and the neck tube passage at least includes the second passage. It can be understood that the second passage is arranged in a spiral shape.
[0030] Regardless of the rotational movement of the adjusting member 300 along the hole depth direction of the through hole 211, the second passage can always connect the resonance cavity 230 and the external sound field, ensuring that the sound wave can smoothly enter the resonance cavity 230 through the second passage.
[0031] The "spiral shape" of the second passage can further optimize the sound wave propagation characteristics: compared with a straight hole passage, the spiral-shaped second passage can lengthen the propagation path of the sound wave in the passage, and can enhance the resonance superposition effect of the sound wave at a specific frequency, further improving the amplification capability of the resonator 100 for the sound pressure of the target frequency band (for example, for low-frequency sound waves, the spiral path can slow down the energy attenuation, and enhance the sound pressure gain).
[0032] Taking the length of the through hole 211 in the hole depth direction being greater than or equal to the length of the adjusting member 300 as an example.
[0033] When the adjusting member 300 is completely inserted into the through hole 211, the length of the second passage is the longest, which makes the length of the neck pipe passage the longest, and is suitable for low frequency sound wave collection. At this time, the length of the neck pipe passage is the longest and is the sum of the length of the second passage and the length of the partial through hole 211. When the adjusting member 300 is pulled out of the through hole 211 to the limit position, the length of the second passage is the shortest, which makes the length of the neck pipe passage the shortest, and is suitable for high frequency sound wave collection. At this time, the length of the neck pipe passage is the shortest and is the sum of the length of the second passage and the length of the partial through hole 211.
[0034] However, the design is not limited to this, and in some other embodiments, the adjusting member 300 is provided with a first passage, one end of the first passage is in communication with the resonance cavity 230, and the other end is in communication with the environment outside the shell 200. The adjusting member 300 can move relative to the through hole 211 in the hole depth direction of the through hole 211, so that the length of the first passage in the through hole 211 is variable.
[0035] In this way, no matter how the adjusting member 300 moves in the hole depth direction of the through hole 211, the first passage can always communicate the resonance cavity 230 with the external sound field, ensuring that the sound wave can smoothly enter the resonance cavity 230 through the first passage.
[0036] For example, in the hole depth direction of the through hole 211, the length of the through hole 211 is greater than or equal to the length of the adjusting member 300.
[0037] When the adjusting member 300 is completely inserted into the through hole 211, the length of the neck pipe passage is the shortest and is the sum of the length of the first passage and the length of the partial through hole 211. When the adjusting member 300 is pulled out of the through hole 211 to the limit position, the length of the neck pipe passage is the longest and is the sum of the length of the first passage and the length of the partial through hole 211. It can be understood that the first passage can be but is not limited to a straight line or a curved shape.
[0038] Further, in some embodiments, the outer circumferential side of the adjusting member 300 surrounds the first passage and is in sealing engagement with the hole wall of the through hole 211. It can be understood that the outer circumferential side of the adjusting member 300 is in sliding engagement with the hole wall of the through hole 211.
[0039] There are many ways to drive the adjusting member 300 to move relative to the through hole 211, and in some embodiments, the resonator 100 further comprises a first gear 510 and a second gear 520, the first gear 510 is in transmission connection with the adjusting member 300, the first gear 510 and the second gear 520 are engaged, and the second gear 520 drives the adjusting member 300 to rotate through the first gear 510.
[0040] If the number of teeth of the second gear 520 is less than that of the first gear 510, when an external driving force (such as manually rotating the second gear 520) acts, the rotation speed of the adjusting member 300 is reduced after being decelerated by the first gear 510, but the torque is increased, which means that the user only needs to rotate the second gear 520 with a small force to drive the adjusting member 300 to fine-tune (such as the neck tube length changes by 0.05 mm per circle of the adjusting member 300), especially suitable for scenarios that require high-precision adjustment but have limited operating space and are not convenient to use force (such as adjusting the microphone of a miniature medical device). If the number of teeth of the second gear 520 is more than that of the first gear 510 (such as speed increasing transmission), the adjusting member 300 can be quickly rotated by quickly rotating the second gear 520, realizing a large change in the length of the neck tube (such as only 3 rotations of the second gear 520 are needed to change from the longest to the shortest), which is suitable for scenarios that require quick switching of pickup frequency bands (such as temporarily adjusting the frequency range of a live recording device).
[0041] In some embodiments, the first gear 510 moves along the hole depth direction of the through hole 211 following the adjusting member 300, to avoid the first gear 510 and the second gear 520 from disengaging during the movement, the thickness of the first gear 510 is greater than that of the second gear 520, which makes the first gear 510 have enough parts for the second gear 520 to engage, or the thickness of the second gear 520 is greater than that of the first gear 510, which makes the second gear 520 have enough parts for the first gear 510 to engage.
[0042] If the first gear 510 and the second gear 520 are hidden in the shell 200, once the first gear 510 and the second gear 520 need to be repaired, the shell 200 needs to be disassembled, which makes it more difficult to repair the first gear 510 and the second gear 520. Therefore, in some embodiments, the first gear 510 and the second gear 520 are arranged outside the shell 200, and the resonator 100 further comprises a first transmission member 410 connected to the adjusting member 300 and the first gear 510.
[0043] In this way, the first gear 510 and the second gear 520 are arranged outside the shell 200, which reduces the difficulty of repairing the first gear 510 and the second gear 520. In addition, in order to enable the first gear 510 to drive the adjusting member 300, a first transmission member is added to ensure that the first gear 510 can transmit power to the adjusting member 300, so that the adjusting member 300 can be driven by the first gear 510.
[0044] In some embodiments, the shell 200 comprises a first shell part 210 and a second shell part 220, the first shell part 210 and the second shell part 220 jointly define a resonant cavity 230, and the second shell part 220 is movable relative to the first shell part 210 to change the volume of the resonant cavity 230.
[0045] According to the principle of acoustic resonance, the resonance frequency of the resonator 100 is determined by the length of the neck pipe channel and the volume of the resonance cavity 230. In related technologies, both are fixed, and only a single frequency can be adapted. The previous solution changes the length of the neck pipe by adjusting the adjusting part 300 to achieve a frequency-adjustable resonator, but the adjustment range is limited to the variable range of the neck pipe length. The present solution adds a new dimension of resonance cavity 230 volume adjustment by making the second shell part 220 movable relative to the first shell part 210.
[0046] The adjustment range is widened, for example, when a very low frequency (such as below 50 Hz) resonance is needed, the length of the neck pipe and the volume of the resonance cavity 230 can be adjusted at the same time, and the frequency can be lowered by the coordination of the two; when a very high frequency (such as above 10 kHz) is needed, the length of the neck pipe and the volume of the resonance cavity 230 can be shortened at the same time, breaking through the adjustment limit of a single dimension; The adjustment accuracy is improved. Near the target frequency, a combination of "coarse adjustment of the length of the neck pipe and fine adjustment of the volume of the resonance cavity 230" (for example, 100 Hz per millimeter of the length of the neck pipe, and 10 Hz per milliliter of the volume of the resonance cavity 230) can achieve more precise frequency locking, suitable for high-precision scenarios such as medical treatment (such as accurately amplifying the heartbeat sound by 200 ± 5 Hz) and professional recording (such as locking the overtone frequency of a specific musical instrument).
[0047] The sizes of sound collection units (such as microphones and pickups) vary (the diameters range from 3 mm to 10 mm), and if the volume of the resonance cavity 230 is fixed, there may be problems such as "large-size units cannot be placed" or "small-size units are placed and the remaining space is too large (volume redundancy causes frequency deviation)". The movable design of the second shell part 220 relative to the first shell part 210 can dynamically adjust the internal space of the resonance cavity 230: When a large-size collection unit is placed, the second shell part 220 is moved away from the first shell part 210 to increase the volume of the resonance cavity 230 to accommodate the unit, and the actual volume change caused by the space occupied by the unit is compensated by subsequent volume adjustment; When a small-size collection unit is placed, the second shell part 220 is moved close to the first shell part 210 to reduce the volume of the resonance cavity 230, avoiding the resonance frequency deviation caused by "too small units resulting in too large remaining space", ensuring that different types of collection units can be stably adapted, and reducing the size limitation on the collection unit.
[0048] In the long-term use of the resonator 100, the resonance frequency may deviate due to the following factors, such as environmental temperature changes, thermal expansion and contraction of the shell 200 material, causing a slight change in the volume of the resonance cavity 230. For example, structural aging: the relative displacement of the first and second shell parts 220 due to loose connecting parts, or the length deviation of the neck pipe channel due to wear.
[0049] The second shell part 220 can be dynamically adjusted to compensate for these deviations: for example, if the resonance frequency is found to decrease due to an increase in temperature (expansion of the shell 200 increases the volume), the frequency can be adjusted back to the target value by moving the second shell part 220 closer to the first shell part 210 (reducing the volume), without the need to replace components, maintaining performance stability and extending the service life of the product.
[0050] Sliding type, the relative sliding direction of the first shell 200 and the second shell 200 is the axial direction or the radial direction of the shell 200. Taking the axial direction as an example, the first shell 200 and the second shell 200 are nested in the axial direction of the shell 200, and the volume of the resonance cavity 230 is adjusted by changing the axial distance of the shell 200. Rotary type, the two are connected by threads, and rotating the second shell part 220 to move it closer to / further away from the first shell part 210 (similar to a bottle cap and a bottle body, with both adjustment and sealing functions); Folding type, using flexible connection (such as silicone seal ring), the second shell part 220 can be folded and deformed relative to the first shell part 210, quickly changing the volume (suitable for scenarios that require significant adjustment).
[0051] At the same time, the active drive can be compatible with manual (such as the user rotating the second shell part 220) and automatic (such as the motor driving the second shell part 220 to slide through gears), further expanding the application scenarios (such as smart devices automatically adapting to environmental frequencies).
[0052] In some embodiments, the first shell part 210 and the second shell part 220 are nested and slidably connected.
[0053] The resonance cavity 230 has a linear relationship between volume change and sliding distance (for example: the volume uniformly increases by 0.5 mL for every 1 mm increase in sliding distance). Compared with rotary connection (volume change has a non-linear relationship with rotation angle, which needs to be converted) or folding connection (volume change is difficult to quantify), this linear characteristic makes the adjustment more intuitive.
[0054] The first shell part 210 and the second shell part 220 are usually designed with matching sliding structures (such as the first shell part 210 having guide rails and the second shell part 220 having sliding blocks; or the first shell part 210 having grooves and the second shell part 220 having protrusions), which ensures that the two can only slide along a fixed track and cannot deviate laterally or skew.
[0055] According to a second aspect of the present disclosure, a microphone is provided, which comprises a sound collecting unit and the above-mentioned resonator 100. The microphone has all the beneficial effects of the above-mentioned resonator 100, and the present disclosure will not be repeated here. Among them, the sound collecting unit is arranged in the resonance cavity 230.
[0056] According to a third aspect of the present disclosure, a vehicle is provided, which comprises the microphone described above, and has all the beneficial effects of the microphone described above, which will not be repeated here.
[0057] The vehicle can be a fuel automobile, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., which is not specifically limited by the present disclosure.
[0058] In order to facilitate the understanding of the present disclosure, a general description of the present disclosure is provided here.
[0059] The microphone is an energy conversion device that converts sound signals into electrical signals. When a sound wave is incident on the diaphragm of the sound collecting unit, it causes the diaphragm to vibrate and finally outputs in the form of an electrical signal. The sensitivity of the microphone is a physical quantity representing the ratio of the output signal voltage to the input sound pressure. When the sound source is far away from the sound collecting unit, the sound intensity propagating to the sound collecting unit is usually low, which causes the low-sensitivity sound collecting unit to be unable to identify the sound source signal, so it is necessary to improve the sensitivity of the sound collecting unit.
[0060] To solve this problem, the sensitivity of the sound collecting unit can be improved, but the cost is high; in addition, the sound intensity propagating to the diaphragm of the sound collecting unit can be increased so that the sound collecting unit can detect it. The resonator 100 has such a property that when a sound wave of a resonance frequency is incident, the sound intensity inside the resonator 100 will be several times higher than the incident sound intensity due to the local resonance effect. At this time, arranging the sound collecting unit at a high sound intensity position can make the sound collecting unit that cannot detect low sound intensity signals detect the signals.
[0061] Based on this principle, the present application proposes a resonator 100. The resonator 100 comprises a shell 200, an adjusting member 300, a first transmission member 410, a first gear 510, a second gear 520, a second transmission member 420, and a third transmission member 430.
[0062] The shell 200 comprises a first shell part 210 and a second shell part 220, both of which are cylindrical. The first shell part 210 is inserted into the first shell part 210, and the first shell part 210 and the second shell part 220 jointly limit a resonance cavity 230. The first shell part 210 and the second shell part 220 are connected in a sliding manner, and the relative sliding direction of the first shell part 210 and the second shell part 220 is the height direction of the shell 200. The first shell part 210 and the second shell part 220 slide relative to each other to control the volume of the resonator 100.
[0063] The bottom of the second shell part 220 is provided with a placement hole 221 communicating with the resonance cavity 230, and the placement hole 221 is used for placing the sound collecting unit.
[0064] The bottom of the first shell part 210 is provided with a through hole 211 which is in communication with the resonance cavity 230, and the adjusting member 300 is arranged in the through hole 211, and the outer circumferential side of the adjusting member 300 is threadedly connected with the inner circumferential side of the through hole 211. It can be understood that the adjusting member 300 can rotate relative to the hole wall of the through hole 211, so that the adjusting member 300 can move in the hole depth direction of the through hole 211. The hole depth direction of the through hole 211 is the height direction of the shell 200.
[0065] In the hole depth direction of the through hole 211, the adjusting member 300 has opposite first and second sides, and the adjusting member 300 is provided with a spiral groove 310 extending from the first side to the second side along the outer circumferential side of the adjusting member 300. The adjusting member 300 cooperates with the first shell part 210 to limit the neck pipe passage. It can be understood that the length of the neck pipe passage will change accordingly as the relative position of the adjusting member 300 and the through hole 211 changes.
[0066] The first transmission member 410 is in the shape of a rod, one end of which is connected with the adjusting member 300, and the other end of which is connected with the first gear 510. The first transmission member 410 extends into the resonator 100 and penetrates through the second shell part 220. The first gear 510 and the second gear 520 are arranged outside the shell 200, and the first gear 510 and the second gear 520 are engaged. In this way, the second gear 520 can be driven to rotate in turn to drive the first gear 510, the first transmission member and the adjusting member 300, so that the adjusting member 300 can move relative to the hole wall of the through hole 211 in the hole depth direction of the through hole 211.
[0067] It can be understood that the first gear 510 will move along with the adjusting member 300 in the hole depth direction of the through hole 211. In order to avoid the first gear 510 and the second gear 520 from disengaging during the movement, the thickness of the first gear 510 is greater than the thickness of the second gear 520, which makes the first gear 510 have enough parts for the second gear 520 to engage.
[0068] The second transmission member 420 is in the shape of a rod, one end of which is connected with the second gear 520. The second transmission member 420 can be connected with a rotary motor or manually rotated by a user to drive the second gear 520 to rotate, so as to drive the adjusting member 300 to move in the hole depth direction of the through hole 211 in the through hole 211, thereby adjusting the position of the adjusting member 300 in the through hole 211.
[0069] The third transmission member 430 is in the shape of a rod, one end of which is connected to the bottom of the second shell part 220, and the other end of the second transmission member 420 can be connected with a motor or manually pushed and pulled by a user, so as to change the position of the second shell part 220 relative to the first shell part 210, thereby changing the size of the volume of the resonance cavity 230.
[0070] The resonator 100 is a Helmholtz resonator 100, the resonant frequency of the resonator 100 is mainly determined by the neck channel length and the resonant cavity 230 volume, both of which can be adjusted in the present disclosure, so that the resonant frequency of the resonator 100 can be adjusted to improve the sensitivity of the sound collection unit at different frequencies.
[0071] Referring to Figures 5 to 7 In order to illustrate the adjustable ability and range of the resonant frequency of the adjusting member 300, we take the rotation angle of the adjusting member 300 in the channel (the adjusting member 300 gradually moves out of or into the channel during rotation) and the displacement of the second shell part 220 of the resonant cavity 230 relative to the first shell part 210 as variable parameters, and give the relationship between the sound intensity ratio at the placement hole 221 and the incident wave sound intensity and the frequency under different groups of parameters. The resonator 100 has an initial state, in which the adjusting member 300 is completely outside the channel and located in the resonant cavity 230, and the second shell part 220 is located in the first shell part 210. At this time, the resonant frequency of the resonator 100 is 280Hz, and the sound intensity ratio at the placement hole 221 is 19. Then, the adjusting member 300 is rotated by 180° relative to the initial state, and the second shell part 220 of the cavity is displaced by 20mm relative to the initial state. At this time, the resonant frequency of the resonant cavity 230 is 123Hz, and the sound intensity ratio at the placement hole 221 is 25. Then, the adjusting member 300 is rotated by 1080° relative to the initial state, and the second shell part 220 of the cavity is displaced by 100mm relative to the initial state. At this time, the adjusting member 300 is completely in the channel, and the volume of the resonant cavity 230 reaches the maximum value. At this time, the resonant frequency of the metamaterial is 30Hz, and the sound intensity ratio at the placement hole 221 is 36. We give the rotation angle of the adjusting member 300 relative to the initial state (range 0°~1080°) and the displacement of the second shell part 220 relative to the initial state (range 0~100mm) when the resonant frequency of the metamaterial is 50Hz, 100Hz, 150Hz, 200Hz, 250Hz respectively, and the sound intensity ratio at the placement hole 221 at the resonant frequency. It can be seen that we can adjust the resonant frequency of the resonator 100 in a wide range of ultralow frequency by adjusting the position of the adjusting member 300 and the second shell part 220, and improve the sensitivity at the corresponding frequency point. In addition, the present disclosure also provides simulation data of Table 2 and Table 3 by controlling variables.
[0072]
[0073] Table 1 Resonant frequency corresponding to the rotation angle and displacement distance of the adjusting member 300 and the second shell part 220 relative to the initial state and the sound intensity ratio at the placement hole 221
[0074] Table 2 resonance frequency corresponding to the displacement distance of the second shell part 220 relative to the initial state and the ratio of the sound intensity at the placement hole 221 to the incident wave sound intensity when the rotation angle of the fixed adjustment part 300 is 270°
[0075] Table 3 resonance frequency corresponding to the rotation angle of the adjustment part 300 relative to the initial state and the ratio of the sound intensity at the placement hole 221 to the incident wave sound intensity when the displacement distance of the second shell part 220 is 0mm In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0076] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can refer to the related description of other embodiments.
[0077] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.
[0078] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application without departing from the technical solution content of the present application still belongs to the scope of the technical solution of the present application.
Claims
1. A resonator, characterized by, The resonator comprises: a housing, provided with a resonance cavity for a sound collecting unit to collect sound, and a through hole in communication with the resonance cavity; and an adjusting member provided in the through hole, the adjusting member and a hole wall of the through hole jointly defining a neck pipe passage in communication with the resonance cavity, the adjusting member being movable relative to the through hole to change a length of the neck pipe passage. The adjusting member is screwed with the hole wall of the through hole, the adjusting member is provided with a helical groove, the hole wall of the through hole is provided with a thread, the thread is screwed with the helical groove, the thread and a groove wall of the helical groove have a gap and define at least part of the neck pipe passage.
2. The resonator of claim 1, wherein The adjusting member is provided with a first passage, one end of the first passage being in communication with the resonance cavity and the other end being in communication with an environment outside the housing, the adjusting member being movable in a hole depth direction of the through hole relative to the through hole to change a length of the first passage located in the through hole.
3. The resonator of claim 1, wherein The resonator further comprises a first gear and a second gear, the first gear being in transmission connection with the adjusting member, the first gear and the second gear being engaged, the second gear driving the adjusting member to rotate through the first gear.
4. The resonator of claim 1, wherein The first gear and the second gear are provided outside the housing, and the resonator further comprises a first transmission member connecting the adjusting member and the first gear.
5. The resonator of claim 4, wherein The first gear and the second gear have different thicknesses.
6. The resonator of claim 5, wherein The housing comprises a first housing part and a second housing part, the first housing part and the second housing part jointly defining the resonance cavity, the second housing part being movable relative to the first housing part to change a volume of the resonance cavity.
7. The resonator of claim 1, wherein The first housing part and the second housing part are sleeved and in sliding connection.
8. The resonator of claim 7, wherein The resonator as claimed in any one of claims 1 to 8; and 9. A microphone, characterized by a sound collecting unit provided in the resonance cavity. The microphone as claimed in claim 9. 10. A vehicle characterized by comprising: