WO2021024690A1

WO2021024690A1 - Microphone

Info

Publication number: WO2021024690A1
Application number: PCT/JP2020/026845
Authority: WO
Inventors: 優土橋
Original assignee: ヤマハ株式会社
Priority date: 2019-08-05
Filing date: 2020-07-09
Publication date: 2021-02-11
Also published as: JP2021027457A

Abstract

Provided is a microphone which can reduce handling noise without incurring a production cost increase.　The microphone is provided with: a housing 10; a microphone capsule 20 provided in the housing 10; an insulator 30 attached to the microphone capsule 20 and the housing 10; and projecting vibration sections 34 provided to the insulator 30. The vibration sections 34 function as a dynamic damper.

Description

Microphone

This disclosure relates to a microphone.

In a microphone, noise may be generated by transmitting vibration due to external vibration or the like to a microphone capsule that mutually converts a sound and an electric signal (hereinafter referred to as a sound signal) representing the waveform of the sound. Specific examples of such noise include handling noise in a handheld type microphone. The handling noise is generated by transmitting vibration from the hand holding the microphone to the housing of the microphone and transmitting the vibration to the microphone capsule supported in the housing, so that a sound signal including the vibration component is output.

In order to suppress the generation of handling noise, a structure has been proposed in which the microphone capsule is supported against the housing by interposing an insulator made of an elastic material such as rubber. For example, Patent Document 1 discloses a structure in which a microphone capsule is elastically supported by a damper containing an electrorheological fluid. In the microphone disclosed in Patent Document 1, when an impact is applied to the main body, the piezoelectric element is deformed to generate electricity, and a voltage is applied to the viscous fluid to make it hard. As a result, the effect of suppressing excessive displacement of the microphone capsule is achieved.

However, even if the technique disclosed in Patent Document 1 is adopted, the resonance of the microphone capsule is still generated by the impact applied to the main body of the microphone, and the output signal of the microphone capsule has a peak corresponding to the frequency of this resonance. It remains the same.

On the other hand, as a countermeasure against handling noise, there is also a measure to prevent the resonance peak due to the low-order vibration mode from appearing in the audible band of 20 Hz to 20 kHz, and there is also a measure to shift the resonance peak to a frequency lower than the lower limit of the audible band. Various proposals have been made. As an example, there are measures such as making the microphone capsule heavier or loosening the support of the microphone capsule by the insulator.

However, measures such as making the microphone capsule heavier or loosening the support of the microphone capsule by the insulator deteriorate the holding performance of the microphone capsule, and there is a problem that the product quality of the microphone cannot be guaranteed.

Patent No. 5055045

The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a microphone capable of reducing handling noise with a simple structure.

The disclosure is characterized by having a housing, a microphone capsule provided in the housing, a support portion attached to the microphone capsule and the housing, and a dynamic vibration absorber provided in the support portion. Providing a microphone.
Further, as a microphone from another viewpoint, a housing, a microphone capsule provided in the housing, and a support portion attached to the microphone capsule and the housing are provided, and the support portions are separated from each other. The dynamic vibration absorber includes a first extension portion and a second extension portion adjacent to each other, and has a dynamic vibration absorber between the first extension portion and the second extension portion. A microphone is provided in which both ends are supported by the first extension and the second extension.
Further, as a microphone from another viewpoint, a cylindrical housing, a microphone capsule provided in the housing, and a support portion that elastically supports the microphone capsule in the housing are provided, and the support portion is provided. Provided is a microphone provided in a first region between the inner peripheral wall of the housing and the outer peripheral wall of the microphone capsule and having a vibrating vibrating body.

It is a partial cross-sectional view which shows the structure of the microphone by 1st Embodiment of this disclosure. It is a top view which shows the structure of the insulator of a microphone. It is sectional drawing of the insulator. It is a side view of the insulator. It is sectional drawing of the vibrating part in the insulator. It is a side view which shows the structure of the insulator in the 2nd Embodiment of this disclosure. It is a side view which shows the structure of the insulator in 3rd Embodiment of this disclosure. It is a side view which shows the structure of the insulator in 4th Embodiment of this disclosure. It is a perspective view which shows the structure of the model M1 of the insulator which does not have the function as a dynamic vibration absorber. It is a perspective view which shows the structure of the model M2 of the insulator including the vibrating part which functions as a dynamic vibration absorber. It is a top view which shows the structure of the model M2. It is a top view which shows the structure of the intermediate member including a vibrating part. It is a side view which shows the structure of the model M2. It is a figure which shows the frequency characteristic of the vibration velocity of the microphone capsule in each case using the models M1 and M2.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

(A: First Embodiment)
FIG. 1 is a partial cross-sectional view showing a configuration example of the microphone 1 according to the first embodiment of the present disclosure. The microphone 1 is a handheld microphone having a substantially cylindrical shape. In FIG. 1, a right-handed Cartesian coordinate system consisting of a z-axis parallel to the central axis of the microphone 1 and an x-axis and a y-axis orthogonal to each other in a plane orthogonal to the z-axis is assumed. FIG. 1 is a cross-sectional view of the microphone head portion of the microphone 1 in a plane including the z-axis. As shown in FIG. 1, the microphone 1 has a housing 10, a microphone capsule 20, an insulator 30 which is a support portion attached to the microphone capsule 20 and the housing 10, and a windshield 40 covering the microphone capsule 20. ..

The housing 10 is a member formed of resin or metal in a cylindrical shape. When using the microphone 1, the user grips the housing 10 so that the z-axis faces in the vertical direction and the windshield 40 faces in the vertically upward direction. The windshield 40 is a member for protecting the microphone capsule 20, and is formed of, for example, a metal mesh. The windshield 40 transmits the sound coming from the outside to the internal space partitioned by the windshield 40 and the housing 10. As shown in FIG. 1, the microphone capsule 20 is supported by the insulator 30 in this internal space.

The microphone capsule 20 is a member formed in a substantially cylindrical shape having a diameter smaller than that of the housing 10. The microphone capsule 20 includes a diaphragm made of synthetic resin or metal, and an electroacoustic converter that converts the vibration of the diaphragm excited by a sound coming from the outside into a sound signal and outputs it. In FIG. 1, the diaphragm and the electroacoustic transducer are not shown. The configuration of the electroacoustic converter can be that of a conventional microphone capsule. Specifically, the electroacoustic converter generates a voice coil connected to a diaphragm and a magnetic field interlinking with the voice coil. Includes magnet and yoke.

Next, the insulator 30 will be described. FIG. 2 is a plan view of the insulator 30 as viewed from the z-axis direction of FIG. FIG. 3 is a cross-sectional view of the insulator 30 of FIG. 2 cut along the zx plane. Further, FIG. 4 is a side view of the region of the insulator 30 of FIG. 2 near the intersection with the zx plane as viewed from the x-axis direction.

The insulator 30 is made of a viscoelastic material such as rubber. As shown in FIG. 2, the insulator 30 has a substantially annular shape along the inner peripheral wall of the housing 10, and as shown in FIG. 1, the inner side wall of the housing 10 and the outer wall of the microphone capsule 20 The microphone capsule 20 is supported against the housing 10 while being sandwiched between the two. That is, the insulator 30 is arranged in the space between the inner peripheral wall of the housing 10 and the outer peripheral wall of the microphone capsule 20 (an example of the first region), and the outer peripheral portion of the insulator 30 is supported by the housing 10. The inner peripheral portion of the insulator 30 supports the microphone capsule 20.

The insulator 30 includes a first horizontal portion 31 and a second horizontal portion 32 shown in FIGS. 3 and 4, a vertical portion 33 (an example of an extension portion), and a vibrating portion 34 (dynamic absorber or vibrating body) shown in FIG. (Example)) is integrally molded. Various methods can be considered for molding, and the insulator 30 may be molded by a well-known processing method such as injection molding. That is, the viscoelastic material is heated to a temperature at which it is softened, and the softened material is filled in a mold by applying an appropriate injection pressure to be solidified, thereby molding the insulator 30.

In the insulator 30, the first horizontal portion 31 and the second horizontal portion 32 form two annular plates that are separated from each other in the z-axis direction and face each other. The vertical portion 33 has a pillar shape extending in the z-axis direction from the upper surface of the second horizontal portion 32 to the lower surface of the first horizontal portion 31, and a plurality of vertical portions 33 are arranged at predetermined intervals along the circumferential direction of the insulator 30. Has been done. Two vibrating portions 34 are provided for each of the plurality of vertical portions 33. These two vibrating portions 34 project like a cantilever from substantially the center of one vertical portion 33 toward both sides in the circumferential direction of the insulator 30. As described above, in the present embodiment, the insulator 30 which is a support portion has two rod-shaped vibrating portions 34 protruding from one vertical portion 33 to both sides in the cylindrical direction. The vibrating portion 34 can vibrate with respect to other regions of the insulator 30 such as the vertical portion 33, and has a resonance frequency determined by its shape and size. That is, the insulator 30 which is a support portion has a vibrating portion 34 which is one region of the support portion and can vibrate with respect to the other region of the support portion. Since the vibrating unit 34 is arranged in the space between the inner peripheral wall of the housing 10 and the outer peripheral wall of the microphone capsule 20 (an example of the first region), the vibrating body 34 is the inner peripheral wall of the housing 10 and the microphone capsule 20. It can vibrate freely without touching the outer peripheral wall of the. The direction of protrusion of the vibrating portion 34 from the vertical portion 33 is not limited to the circumferential direction with respect to the z-axis direction, and if it protrudes in a direction that does not contact the inner peripheral wall of the housing 10 and the outer peripheral wall of the microphone capsule 20. It may be, for example, a direction orthogonal to the z-axis or a direction intersecting the z-axis.

In the present embodiment, the resonance frequency of the vibrating unit 34 is matched with the resonance frequency of the microphone capsule 20, and the vibrating unit 34 functions as a dynamic vibration absorber that absorbs the vibration of the microphone capsule 20. In the present embodiment, the resonance frequency of the vibrating unit 34 is in the range of 50 to 500 Hz.

5 (a) to 5 (c) are views showing an example of a cross-sectional shape in which the vibrating portion 34 is cut by a plane orthogonal to the protruding direction thereof, and the vertical direction on the paper surface is the z-axis direction. In the example shown in FIG. 5A, the cross-sectional shape of the vibrating portion 34 is circular. The vibrating portion 34 has a uniform elastic modulus with respect to all vibration directions along the cross section. Therefore, a stable vibration suppressing effect can be obtained with respect to a change in the posture of the microphone 1 held by the user. The cross-sectional shape of the vibrating portion 34 shown in FIG. 5B is a rectangle, in which the size d1 in the central axis direction of the microphone 1 is longer than the size d2 in the z-axis direction. Therefore, the elastic modulus in the central axis direction of the vibrating portion 34 shown in FIG. 5B is higher than the elastic modulus in the z-axis direction. The cross-sectional shape of the vibrating portion 34 shown in FIG. 5C is also rectangular, but in this rectangle, the size d1 in the central axis direction is shorter than the size d2 in the z-axis direction. Therefore, the elastic modulus in the z-axis direction of the vibrating portion 34 shown in FIG. 5C is higher than the elastic modulus in the central axis direction.

In the present embodiment, it is necessary to match the resonance frequency of the vibrating unit 34 with the resonance frequency of the microphone capsule 20. The resonance frequency of the vibrating portion 34 is determined by the elastic modulus and mass of the vibrating portion 34. The elastic modulus of the vibrating portion 34 depends on the cross-sectional shape of the vibrating portion 34 and the length of the vibrating portion 34 in the protruding direction. The mass of the vibrating portion 34 also depends on the cross-sectional shape of the vibrating portion 34 and the length of the vibrating portion 34 in the protruding direction. Therefore, in the present embodiment, it is necessary to determine the cross-sectional shape and the length in the protruding direction of the vibrating portion 34 so that a resonance frequency that matches the resonance frequency of the microphone capsule 20 can be obtained.

In the present embodiment, when using the microphone 1, the user grips the housing 10 so that the windshield 40 faces vertically upward. In this state, the vibrating portion 34 of the insulator 30 functions as a dynamic vibration absorber. In this dynamic vibration absorber, a so-called spring mass system is formed by the elasticity and mass of the vibrating portion 34. In the present embodiment, the vibration of the microphone capsule 20 in the vertical vertical direction is suppressed by the resonance of the spring mass system. More specifically, when vibration is transmitted from the hand of the user holding the microphone 1 to the housing 10 and resonance in the z-axis direction is excited by the microphone capsule 20 supported in the housing 10, the vibrating unit 34 moves to the microphone. It resonates with the capsule 20 in the opposite phase. The vibration of the microphone capsule 20 is suppressed by the resonance of the opposite phase of the vibrating portion 34.

As described above, in the present embodiment, the vibrating portion 34 integrally molded with the other region of the insulator 30 functions as a dynamic vibration absorber to reduce handling noise. Therefore, according to the present embodiment, handling noise can be suppressed without increasing the manufacturing cost of the microphone 1.

(B: Second embodiment)
FIG. 6 is a side view of the insulator 30A according to the second embodiment of the present disclosure as viewed from the x-axis direction of FIG. 1 above. FIG. 6 corresponds to FIG. 4 of the first embodiment.

The insulator 30A has a first horizontal portion 31 and a second horizontal portion 32 and a vertical portion 33 similar to those in the first embodiment, and each 2 protrudes from each vertical portion 33 on both sides in the circumferential direction of the insulator 30A. It has a book vibrating portion 34 m. The vibrating portion 34m is composed of a shaft portion 34a on the vertical portion 33 side and a weight portion 34b on the tip side having a larger cross-sectional area than the shaft portion 34a. Then, the vibrating portion 34m has a center of gravity G on the tip side of the position of the length L / 2, which is half the total length L, with the vertical portion 33 as a reference. Similar to the first embodiment, in this embodiment as well, the vibrating portion 34m is integrally molded together with the other region of the insulator 30A. The same effect as that of the first embodiment can be obtained in this embodiment as well. Further, according to the present embodiment, the resonance frequency of the vibrating portion 34m can be adjusted by adjusting the position of the center of gravity G of the vibrating portion 34m. Therefore, it becomes easy to match the resonance frequency of the vibrating portion 34m with the resonance frequency of the microphone capsule 20.

(C: Third Embodiment)
FIG. 7 is a side view of the insulator 30B according to the third embodiment of the present disclosure as viewed from the x-axis direction of FIG. 1 above. FIG. 7 corresponds to FIG. 4 of the first embodiment.

This insulator 30B has a first horizontal portion 31 and a second horizontal portion 32, a vertical portion 33, and

vibration portions

34c and 34d, which are the same as those in the first embodiment. In the present embodiment, the vibrating

portions

34c and 34d project from each vertical portion 33 on one side in the circumferential direction of the insulator 30B, and the vibrating

portions

34c and 34d project on the other side in the circumferential direction of the insulator 30B. Similar to the first embodiment, in this embodiment as well, the vibrating

portions

34c and 34d are integrally molded together with other regions of the insulator 30B. Here, the protruding length of the vibrating portion 34c from the vertical portion 33 is longer than the protruding length of the vibrating portion 34d from the vertical portion 33. Therefore, the resonance frequency of the vibrating unit 34c deviates from the resonance frequency of the vibrating unit 34d.

In this embodiment, for example, the resonance Q of the vibrating portion is sharper than that of the resonance Q of the microphone capsule 20, and if the vibrating portion corresponding to one type of resonance frequency is provided, the resonance of the microphone capsule 20 is effective. It is effective when it is difficult to attenuate the frequency. Specifically, the resonance characteristics of the two types of vibrating

portions

34c and 34d cover the frequency band in which the resonance peak of the microphone capsule 20 occurs. According to the present embodiment, since the two types of vibrating

portions

34c and 34d having different lengths are provided, the resonance of the microphone capsule 20 is sharp even when the resonance Q of the vibrating portion is sharp with respect to the resonance Q of the microphone capsule 20. Can be effectively dampened. In the present embodiment, two types of vibrating portions having different lengths are provided, but three or more types of vibrating portions having different lengths may be provided.

(D: Fourth Embodiment)
FIG. 8 is a side view of the insulator 30C according to the fourth embodiment of the present disclosure as viewed from the x-axis direction of FIG. 1 above. FIG. 8 corresponds to FIG. 4 of the first embodiment.

This insulator 30C has a first horizontal portion 31 and a second horizontal portion 32, a vertical portion 33, and a vibrating portion 34n, which are the same as those in the first embodiment. The vibrating portion in the first to third embodiments was a cantilever with one end fixed to the vertical portion 33 and the other end free. On the other hand, the vibrating portion 34n in the present embodiment is a double-sided beam in which both ends are fixed, specifically, both ends are fixed to two vertical portions 33 which are separated from each other and adjacent to each other. That is, in the present embodiment, the insulator 30C, which is a support portion, includes a first extension portion (one vertical portion 33) and a second extension portion (adjacent vertical portion 33), and is the first. A vibrating portion 34n is provided between the extension portion and the second extension portion. Similar to the first embodiment, in this embodiment as well, the vibrating portion 34n is integrally molded together with the other region of the insulator 30C. Further, as in the first embodiment, the vibrating unit 34n functions as a dynamic vibration absorber.

As shown in FIG. 8, one vibrating portion 34n includes a weight portion 34g located at the center between the two vertical portions 33 and two shafts extending from the weight portion 34b to the two vertical portions 33. It has

parts

34e and 34f. Here, the cross-sectional area of the weight portion 34b is larger than the cross-sectional area of the

shaft portions

34e and 34f. Further, since the weight portion 34b is arranged in a space (an example of the first region) formed between the inner peripheral wall of the housing 10 and the outer peripheral wall of the microphone capsule 20, the inner peripheral wall of the housing 10 and the microphone capsule 20 are arranged. It can vibrate freely without touching the outer wall of the.

Also in this embodiment, the vibrating portion 34n, which is one region of the insulator 30B, can vibrate with respect to another region of the insulator 30B such as the vertical portion 33. The vibrating unit 34n has the same resonance frequency as the microphone capsule 20. Therefore, also in this embodiment, the resonance of the microphone capsule 20 can be attenuated by the vibrating unit 34n. Further, since both ends of the vibrating portion 34n in the present embodiment are fixed to the vertical portion 33, fatigue generated in the boundary region between the vibrating portion 34n and the vertical portion 33 can be reduced.

(E: Confirmation of effect)
In order to confirm the effect of each of the above embodiments, the inventor of the present application assumed two insulator models and obtained the frequency characteristics of the vibration generated in the microphone capsule by simulation. FIG. 9 is a perspective view showing the configuration of the model M1 used in the simulation. Further, FIG. 10 is a perspective view showing the configuration of the model M2 used in the simulation.

Model M1 is an insulator composed of an annular first horizontal portion 31 and a second horizontal portion 32 and having no dynamic vibration absorber. The model M2 is composed of an annular first horizontal portion 31 and a second horizontal portion 32, and an intermediate member 35 provided between them. The intermediate member 35 includes a vibrating portion that functions as a dynamic vibration absorber. The first horizontal portion 31 and the second horizontal portion 32 of the models M1 and M2 are fixed at intervals in the z-axis direction while being sandwiched between the inner wall surface of the housing 10 and the outer wall surface of the microphone capsule 20. (See FIG. 1).

FIG. 11 is a plan view of the model M2 viewed from above in the vertical direction. FIG. 12 is a plan view of the intermediate member 35 viewed from above in the vertical direction with the first horizontal portion 31 removed. Further, FIG. 13 is a side view of the model M2.

In FIG. 11, the first horizontal portion 31 of the model M2 has an annular shape with an outer diameter L1 of 36 mm and an inner diameter L2 of 20.1 mm. The second horizontal portion 32 also has the same shape as the first horizontal portion 31. Further, the first horizontal portion 31 and the second horizontal portion 32 of the model M1 also have the same shape as the first horizontal portion 31 shown in FIG.

Model M2 corresponds to the insulator of the fourth embodiment. As shown in FIGS. 12 and 13, the intermediate member 35 of the model M2 has four vertical portions 33 extending from the upper surface of the second horizontal portion 32 to the lower surface of the first horizontal portion 31, and two adjacent vertical portions 33. It has four vibrating portions 34n, each of which is provided between the portions 33. The vibrating portion 34n functions as a dynamic vibration absorber. As described in the fourth embodiment, one vibrating portion 34n has a weight portion 34g and two

shaft portions

34e and 34f extending from the weight portion 34b to two vertical portions 33. In the model M2, the

shaft portions

34e and 34d have a thickness d11 in the z-axis direction of 0.2 mm, a width w11 in the radial direction (direction of the diameter of the annular insulator) of 4 mm, and a circumferential direction (circle). The length d21 in the circumferential direction of the ring-shaped insulator is 1.77 mm. The weight portion 34 g has a thickness d12 in the z-axis direction of 11 mm, a width w12 in the radial direction of 6 mm, and an angle θ between both ends in the circumferential direction of 70 °. Further, in the models M1 and M2, the height d13 from the lower surface of the second horizontal portion 32 to the upper surface of the first horizontal portion 31 is 20 mm.

FIG. 14 shows the results of simulating each of the microphone 1 to which the model M1 is applied and the microphone 1 to which the model M2 is applied. The vertical axis in FIG. 14 is a coordinate axis representing a common logarithmic value of the vibration velocity of the evaluation surface when the upper surface S1 of the microphone capsule 20 is used as an evaluation surface, and the horizontal axis is a coordinate axis representing a frequency.

In FIG. 14, the frequency characteristic G01 shows the relationship between the vibration speed and the frequency of the evaluation surface of the microphone 1 to which the model M1 is applied, and the frequency characteristic G02 shows the vibration of the evaluation surface of the microphone 1 to which the model M2 is applied. It shows the relationship between speed and frequency.

In the frequency characteristic G01 when the model M1 is used, a resonance peak occurs in the vicinity of 160 Hz due to the spring mass system formed by the housing 10, the model M1, and the microphone capsule 20. On the other hand, in the frequency characteristic G02 when the model M2 is used, in the vicinity of 160 Hz, the resonance of the spring mass system and the resonance of the opposite phase occur in the vibrating portion 34n of the intermediate member 35, and the resonance of the opposite phase causes resonance. The peak decreases. In this way, it was confirmed that the amount of handling noise generated in the microphone capsule 20 was reduced by the vibrating unit 34n.

In the simulation described above, the model M2 corresponding to the insulator of the fourth embodiment is used, but since the insulators of the other embodiments are basically based on the same principle as the fourth embodiment, the above The same effect as the model M2 can be expected.

(F: Other Embodiment)
Although each embodiment of this disclosure has been described above, other embodiments can be considered in this disclosure. For example:

(1) The technique of shifting the resonance peak by the low-order vibration mode to a frequency lower than the lower limit of the audible band and the technique disclosed in each of the above embodiments may be used in combination. Specifically, the resonance peak due to the low-order vibration mode is shifted to a frequency lower than the lower limit of the audible band by a measure such as making the microphone capsule heavier or loosening the support of the microphone capsule by the insulator. Then, the insulator is provided with a vibrating portion having a resonance frequency that matches the frequency of the resonance peak after the shift. According to this aspect, the resonance peak due to the low-order vibration mode is shifted to a frequency lower than the lower limit of the audible band, and the resonance peak after this shift is reduced by the vibrating portion, so that the influence of handling noise is more reliable. Can be suppressed.

(2) In each of the above embodiments, in a state where the microphone is gripped along the vertical direction, the handling noise having an amplitude in the vertical direction is reduced by the vibrating portion protruding in the horizontal direction with respect to the insulator. However, the protruding direction of the vibrating portion is not limited to this. In a state where the microphone is gripped along the vertical direction, a vibrating portion protruding in the vertical direction may be provided with respect to the insulator, and the vibrating portion may reduce handling noise having an amplitude in the horizontal direction. Alternatively, in a state where the microphone is gripped along the vertical direction, the insulator is provided with a vibrating part protruding in the horizontal direction and a vibrating part protruding in the vertical direction protruding in the vertical direction, and these two types of vibrating parts provide a vibrating part in the vertical direction. The handling noise having an amplitude and the handling noise having an amplitude in the horizontal direction may be reduced.

(3) In each of the above embodiments, the vibrating portion and the other region of the insulator are integrally molded, but the vibrating portion and the other region may be manufactured separately and the two may be combined. For example, the vibrating portion and another region of the insulator may be fixed with an adhesive. Alternatively, the vibrating portion may be screwed to another region of the insulator. Further, in each of the above embodiments, the vibrating portion and other regions of the insulator are made of the same material, but both may be made of different materials.

(4) In the second embodiment (FIG. 6) and the fourth embodiment (FIG. 8), the

weight portions

34b and 34g and the

shaft portions

34a, 34e and 34f are made of the same material, but may be different materials. Good. For example, the

shaft portions

34a, 34e and 34f may be made of rubber, and the

weight portions

34b and 34g may be made of metal. On the contrary, the

shaft portions

34a, 34e and 34f may be made of metal, and the

weight portions

34b and 34g may be made of rubber.

(5) In the fourth embodiment (FIG. 8), a plurality of vibrating portions 34n may be provided between adjacent vertical portions 33. In this case, the mass of the weight portion 34g may be different among the plurality of vibrating portions 34n.

(6) The resonance frequency of the dynamic vibration absorber may be appropriately determined according to the noise band to be vibration-absorbed. In a preferred embodiment, the resonance frequency of the dynamic vibration absorber is in the range of 20 to 20000 Hz. In a more preferred embodiment, the resonance frequency of the dynamic vibration absorber is in the range of 50 to 1000 Hz.

1 ... Microphone, 10 ... Housing, 20 ... Microphone capsule, 30 ... Insulator, 40 ... Windshield, 31 ... 1st horizontal part, 32 ... 2nd horizontal part, 33 ... Vertical part, 34,34m, 34n, 34c, 34d ... Vibrating part, 34a, 34e, 34f ... Shaft part, 34b, 34g ... Weight part, 35 ... Intermediate member, M1, M2 ... Model.

Claims

With the housing
The microphone capsule provided in the housing and
A support portion attached to the microphone capsule and the housing,
A microphone having a dynamic vibration absorber provided on the support portion.
The microphone according to claim 1, wherein the dynamic vibration absorber is rod-shaped and has elasticity.
The microphone according to claim 1 or 2, wherein the dynamic vibration absorber has a center of gravity on the tip side of the position of half of the total length.
The microphone according to any one of claims 1 to 3, wherein the dynamic vibration absorber has a weight at the tip.
The microphone according to any one of claims 1 to 4, which has a plurality of the dynamic vibration absorbers.
The microphone according to claim 5, wherein at least one set having a different length exists among the plurality of dynamic vibration absorbers.
With the housing
The microphone capsule provided in the housing and
A support portion attached to the microphone capsule and the housing is provided.
The support portion includes a first extension portion and a second extension portion that are separated from each other and are adjacent to each other, and a dynamic vibration absorber is provided between the first extension portion and the second extension portion. The dynamic vibration absorber is a microphone whose both ends are supported by the first extension portion and the second extension portion.
The microphone according to any one of claims 1 to 7, wherein the resonance frequency of the dynamic vibration absorber is 20 to 20000 Hz.
The microphone according to any one of claims 1 to 8, wherein the resonance frequency of the dynamic vibration absorber is 50 to 1000 Hz.
The housing has a cylindrical shape and has a cylindrical shape.
The support portion has an annular shape along the inner peripheral wall of the housing.
The microphone according to any one of claims 1 to 9, wherein the dynamic vibration absorber protrudes from the support portion in the circumferential direction.
The microphone according to claim 10, wherein the dynamic vibration absorber projects like a cantilever.
Cylindrical housing and
The microphone capsule provided in the housing and
A support portion that elastically supports the microphone capsule to the housing is provided.
The support portion is provided in a first region between the inner peripheral wall of the housing and the outer peripheral wall of the microphone capsule, and has a vibrating vibrating body.
The support portion is provided in the first region and has an extension portion extending in the first direction substantially parallel to the axial direction of the housing.
The microphone according to claim 12, wherein the vibrating body is provided in the extension portion.
The microphone according to claim 13, wherein the vibrating body extends from the extending portion in a direction intersecting the first direction in the first region.
The support portion has an annular shape along the inner peripheral wall of the housing.
The microphone according to claim 13 or 14, wherein the vibrating body projects in the circumferential direction from the extending portion.
The microphone according to any one of claims 13 to 15, wherein the vibrating body projects from the extending portion in a cantilever shape.
The microphone according to any one of claims 13 to 16, wherein the vibrating body is integrally formed with the extending portion.
Any one of claims 13 to 17, wherein the vibrating portion extends from the first extension portion to the second extension portion, which is two adjacent portions of the plurality of extension portions as the extension portion. The microphone according to item 1.
The microphone according to claim 18, wherein the vibrating portion has a weight portion in the center between the first extension portion and the second extension portion.