JPH0649036Y2 - Anti-vibration structure of microphone - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a vibration isolation structure for a microphone, which is characterized by the structure of a microphone unit vibration isolator, and reduces touch noise and improves reliability against vibration and shock. Is intended.

[Conventional technology]

The anti-vibration structure of the microphone reduces the touch noise that makes a rattling noise when gripped with your hand, and prevents the microphone unit from rattling and colliding with the housing when it receives vibration or shock. It must be highly reliable.

A conventional vibration isolation structure for a microphone is shown in FIGS. 2 and 3.

In FIG. 2, the microphone unit 10 is provided with a housing 12 via a vibration-proof body (made of an elastic body such as neoprene or butyl rubber) 14.
A support rod 16 that is supported by and is connected to the lower end of the microphone unit 10 is supported by the housing 12 via a vibration isolator 18.

In FIG. 3, the microphone unit 10 is housed in a box-shaped vibration isolator 20, and the top and bottom of the microphone unit 10 are supported by the housing 12 via the vibration isolator 20.

In such a structure, it was necessary to make the vibration-proof bodies 14 and 20 supporting the microphone unit 10 from a material (hard) having small compliance in order to make them strong against vibration and impact. However, if the vibration proof bodies 14 and 20 are made of a material having a small compliance, there is a drawback that they are vulnerable to touch noise.

As described above, it is difficult for the conventional anti-vibration structure to achieve both reduction of touch noise and reliability against vibration and shock.

[Problems to be solved by the invention]

The present invention is intended to solve the problems in the conventional technique and provide a vibration damping structure for a microphone that reduces touch noise and improves reliability against vibration and shock.

[Means for solving problems]

This invention is mounted between a microphone unit and an outer casing thereof, and is attached to the lower end of the microphone unit, which is composed of an elastic body that supports the microphone unit and is composed of an elastic body. A support rod vibration isolator that is sandwiched between the support rod and the housing and that supports the support rod, and that is formed of an elastic body. It is characterized in that the body is folded back and is sandwiched between the microphone unit and the housing in a state where the folded back portions are in contact with each other.

[Action]

According to this invention, the vibration isolator of the microphone unit is formed by folding back a cylindrical vibration isolator made of an elastic body, and is sandwiched between the microphone unit and the housing with the folded portions in contact with each other. Since it is incorporated, the displacement stress between the folded portions and the energy loss due to the frictional movement become large. Therefore, the Q in the transfer characteristic is suppressed to a low level, resonance is suppressed, a large vibration force is obtained, and vibration energy can be absorbed. Therefore, touch noise can be effectively reduced even if a material with small compliance is used. You can

〔Example〕

 An embodiment of this invention is shown in FIG.

In FIG. 1, a cylindrical aluminum upper housing 24 is screwed onto the upper portion of the body 22. Microphone unit
10 is fitted and supported on the upper part of the upper housing 24 via a cylindrical vibration isolator 26. Inside the upper housing 24, a metal ring-shaped vibration isolator support 28 and the ring-shaped vibration isolator support
A disk-shaped vibration isolator 30 supported by 28 is housed from below.

A cylindrical plastic lower housing 32 is screwed into the lower portion of the upper housing 24, so that the disk-shaped vibration isolator 30 can be installed in both housings.
Fixed at 24,32. Another disk-shaped vibration isolator 34 is embedded in the lower housing 32.

A terminal plate 36 is attached to the bottom of the microphone unit 10 with terminal plate fixing screws 38.

The support rod 16 is inserted into the disk-shaped vibration isolator 34, the cylindrical spacer 42 made of aluminum, and the disk-shaped vibration isolator 30, and is screwed into the terminal plate fixing screw 38. At the bottom of the support rod 16,
The nut 44 is tightened. As a result, the support rod 16 is elastically supported by the housings 24, 32 via the disk-shaped vibration isolator 30, 34.

A cylindrical spacer 45, a plate-shaped snapper ring 46, and a terminal plate 47 are inserted in the lower portion of the support rod 16, and these are fastened and integrated by a nut 48.

The windscreen 50 is put on the microphone unit 10 and screwed into the body 22.

The cylindrical vibration isolator 26 that elastically supports the microphone unit 10
Shown in the figure. In FIG. 4, a is a plan view, and b is A- of A.
A sectional view, C is a sectional view showing a usage state. The cylindrical vibration isolator 26 is made of an elastic body such as neoprene or butyl rubber. As shown in FIG. 1, the cylindrical vibration isolator 26 is fitted into the lower end portion of the microphone unit 10, folded back, and fitted into the upper opening of the upper housing 24 in a state where the folded back portions are in contact with each other. Be done. At this time, the upper end portion of the cylindrical vibration isolator 26 is a convex portion formed on the outer peripheral surface of the microphone unit 10.
Locked to 10a. On the lower inner peripheral surface of the cylindrical vibration isolator 26,
A convex portion 26a is formed so as to be locked to the upper end portion of the upper housing 24 in a state of being folded back and used. In addition, this convex portion 2
Notch 26b is formed in 6a to facilitate folding back.

According to this cylindrical vibration-damping body 26, even if it is made of a material having the same compliance, it has a lateral shape as shown by an arrow in FIG. 4 as compared with a simple cylindrical shape without folding back as shown in FIG. Energy loss due to frictional movement in the direction or vertical direction and frictional movement in the state where the folded parts are in contact with each other is large, so that Q in the vibration transfer characteristic is lowered, resonance is suppressed, and a large braking force is obtained. Since vibration energy can be absorbed, touch noise can be effectively suppressed.

Further, according to this cylindrical vibration isolator 26, since it is formed into a cylindrical shape and then folded back, a biasing force is applied as shown in FIG. Therefore, the initial compliance is small, and the action of trying to position the microphone unit 10 at the center works. Moreover, this acts as a biasing force, and the spring constant of the material itself does not change, so the effect of reducing touch noise does not change.

Next, FIG. 7 shows the disk-shaped vibration absorbers 30 and 34 that elastically support the support rod 16. In Fig. 7, a is a plan view, and b is B of a.
It is a -B sectional view. The disk-shaped vibration isolator 30, 34 is made of an elastic body such as neoprene or butyl rubber. Disc-shaped vibration isolator 30,3
The hole 4 for passing the support rod 16 is formed in the center of the member 4. Further, a metal ring member 54 is embedded so as not to be deformed when tightened by the nut 44 (FIG. 1). Further, a plurality of holes 56 are formed in order to obtain appropriate vibration damping performance.

Here, the effect of supporting three points by using three vibration isolator 26,30,34 like the said Example is demonstrated.

Usually, the compliance to be given to the vibration isolator is obtained by evaluating the resonance frequency determined by the mass of the microphone unit side supported by these vibration isolator and the composite compliance of all the vibration isolator. In particular, the form of evaluation of the resonance frequency of the microphone in the vertical direction has been often seen.
It is true that vertical compliance is an extremely important factor, but in actual use, vibrations and shocks applied to the microphone are not limited to the vertical direction, and they should come from all directions. In addition, their application sites should be various. Therefore, it can be said that the purpose of merely obtaining the specific longitudinal resonance frequency is still insufficient to give the vibration isolator a predetermined longitudinal compliance.

FIG. 8 schematically shows the vibration damping structure shown in the embodiment of FIG. According to this, the microphone unit 10 and the support rod 16 respectively have the cylindrical vibration-proof bodies 26 and 2 spaced apart from each other.
It is supported by individual disc-shaped vibration isolators 30, 34.

The vertical compliance of the vibration isolator required to obtain a specific resonance frequency in the longitudinal direction is mainly due to the disk-shaped vibration isolator 30,34.
It can be considered that the two of them are distributed and in charge. In addition,
It is needless to say that even if the two components are dispersed in this way, a desired composite compliance can be obtained without any trouble by examining the materials and the like.

Further, since the cylindrical vibration isolator 26 is provided, as a whole, the support points of the microphone unit 10 and the support rod 16 are present at three locations separated by a distance. Therefore, compared to the two-point support as shown in FIG. 2 and FIG. 3, even if a vibration or impact other than the vertical direction is applied to a specific part such as the center of gravity of the microphone unit 10, the resonance system is These are divided and ambiguous, and these vibrations and impacts can be avoided without causing a large resonance. In other words, even when vibration and impact act on the microphone unit 10 and the support rod 16 as a force such as twisting or rotation, the three-point support is used.
This means that the braking effect can be increased compared to the two-point support.

Due to these overall effects, this structure has a sufficiently high reliability against vibration and shock.

Further, since the disk-shaped vibration isolator 30, 34 guarantees a considerable amount of reliability against vibrations and shocks, a vibration proof body of the microphone unit 10 having a large compliance such as the cylindrical vibration isolator 26 is used. The touch noise can be further reduced.

[Effect of device]

As described above, according to the present invention, the microphone unit vibration isolator is formed by folding back the cylindrical vibration isolator, which is made of an elastic body, and the folded back portions are in contact with each other. Since it is sandwiched between and, the energy loss due to the displacement stress between the folded back portions and the frictional movement becomes large. Therefore, the Q in the transfer characteristic is suppressed to a low level, resonance is suppressed, a large control force is obtained, and vibration energy can be absorbed, so that touch noise can be effectively reduced even if a material with low compliance is used. You can

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention. 2 and 3 are cross-sectional views showing a conventional vibration damping structure. FIG. 4 is a diagram showing the cylindrical vibration isolator 26 of FIG. 1, where a is a plan view, b is a sectional view taken along the line AA of c, and c is a sectional view showing a usage state. FIG. 5 is a cross-sectional view showing a cylindrical vibration isolator without folding back. FIG. 6 is a characteristic diagram of the cylindrical vibration isolator 26. FIG. 7 is a view showing the disk-shaped vibration isolator 30, 34 of FIG. 1, a is a plan view, and b is a BB cross-sectional view of a. FIG. 8 is a diagram schematically showing a vibration isolation structure in the embodiment of FIG. 10 …… Microphone unit, 16 …… Support rod, 24,32 …… Housing, 26 …… Cylindrical vibration isolator (microphone vibration isolator), 3
0,34 …… Disc-shaped vibration isolator (support rod vibration isolator).

Claims (1)

[Scope of utility model registration request] 1. A microphone unit anti-vibration body which is sandwiched between a microphone unit and an outer casing thereof and is formed of an elastic body for supporting the microphone unit, and which is attached to a lower end portion of the microphone unit. A support rod vibration isolator made of an elastic body that is sandwiched between the support rod and the housing and supports the support rod. An anti-vibration structure for a microphone, which is configured by folding a vibrating body, and is sandwiched between the microphone unit and the housing in a state where the folded portions are in contact with each other.