JP6726123B2 - Sound insulator - Google Patents

Description

The present invention relates to an audio device amplifier, a CD player, a DVD player, a BD player/recorder, an audio device such as a TV, an audio insulator for supporting a multimedia PC, a speaker, a musical instrument and the like.

It is known that not only fine internal vibration generated from a vibration source such as a built-in power transformer and a motor but also external vibration deteriorates sound quality and adversely affects sound image localization.
In general, an insulator is provided between the acoustic device and the placement surface (floor surface) to absorb or quickly release these vibrations.
For the insulator, a hard material such as stone or metal is used in addition to an elastic material such as rubber or plastic, and the shape thereof is various.
As a conventional insulator, for example, Patent Document 1 discloses an insulator that is supported at one point by using a spike having a single conical shape, and Patent Document 2 discloses an insulator in which a tubular resin member and a coil spring are combined. Patent Document 3 discloses an insulator in which a spike and a coil spring are combined.
Patent Document 4 discloses an insulator in which a hollow sound collecting space is formed in the center of the bottom surface of a leg body formed of a resin composition in a columnar shape, and a radial sound emitting space communicating with the sound collecting space is formed. Has been done.
Although the insulator described in Patent Document 4 can solve the problems of Patent Documents 1 to 3 to some extent, there is room for improvement in the effect of suppressing microvibration of the audio equipment, and there is variation in the composition and composition of the materials used for the leg body The sound quality of the device is easy to change.
Conventional insulators provide good acoustic characteristics to audio equipment, but their effects are limited, and further improvement is required.

Japanese Patent No. 3848987 JP, 2013-126016, A JP2012-156802A JP, 2016-86408, A

The present invention has been made in view of the above points, and it is an object of the present invention to improve the effect of suppressing micro-vibration of an audio device and enhance the cutoff property of vibration transmission to a mounting surface. It is an object of the present invention to provide an acoustic insulator that improves the acoustic characteristics of the.
Still another object of the present invention is to provide an acoustic insulator capable of realizing high quality sound by reducing a change in sound quality due to variations in components and blends of materials used for the insulator.
Further, another object of the present invention is to reduce unpleasant low-frequency vibrations to provide a comfortable natural sound, extension of mid- and low-pitched tones, sound quality and extension of each musical instrument or vocal body, and stereophonic effect of sound. Is to provide a sound insulator that is far superior to the conventional one.

A first invention of the present application is an acoustic insulator mainly including a leg body, and a stepped hole for movably attaching the leg body to a bottom surface of an audio device by a mounting screw at a central portion of the leg body. Is formed, on the bottom surface of the leg body, attenuators exhibiting a triangular section, a trapezoidal section or an arch section in a section from the central portion side to the outer peripheral portion side of the leg body are radially and spaced from each other, and A plurality of protrusions are provided so as to form a second space communicating from the first space formed by the stepped hole to the outer peripheral side of the leg main body, and the attenuator is the outer peripheral side from the central part side of the leg main body. triangular cross section extending section side, uniform or different width of trapezoidal cross section or a cross section arched, said plurality of attenuators, the height of the support legs across the mounting surface to form the by contacting the second space and It is characterized by
A second invention of the present application is the acoustic insulator of the first invention , wherein the attenuators are adjacent to each other such that the height of the triangular cross section, the trapezoidal cross section or the arched cross section becomes higher on the center side of the leg body. It said bottom surface between said attenuator fit, tilted over from the outer side to the center side, characterized that you form.
A third invention of the present application is the acoustic insulator of the first invention or the second invention , wherein the attenuator has a triangular cross-section, a trapezoidal cross-section, or an arched cross-section width that is narrower on the central portion side of the leg body. It is characterized by that.

Conventionally, as shown in FIG. 16, a plurality of sound emitting spaces extending from the center side to the outer peripheral side of the leg body are formed on the bottom surface side of the body, but this cannot be solved only by the shape of the sound emitting groove.
There is no way to efficiently release the vibration that diffuses inside while blocking the external vibration by just providing the sound emitting groove on the leg body, so that it will be diffusely reflected and you will feel a delay in the phase on the auditory sense. The outline was unclear. At the same time, the felt is used as a vibration damping mat to attenuate the necessary sound and reduce the clarity.
In addition, the vibration movement of the leg body is concentrated near the center for higher-pitched vibrations and closer to the outer circumference for lower-pitched vibrations. It mixes low-frequency vibrations and concentrates on a single point, causing diffuse reflection and degrading sound quality. Further, since the spike receiving portion needs to absorb sound, the receiving portion has a great influence.
The inventor has conducted intensive research on a plurality of shapes, and by making the cross-section into a triangular shape or the like, high-frequency vibration of the center of the insulator and vibration of the outer periphery are efficiently damped, and the material used for the insulator is For acoustics, while avoiding the influence of variations in components and composition, it has significantly better acoustic performance than before, increases the occupancy of sound quality due to the structure, and can minimize the change in sound quality due to material composition error. They found that an insulator could be obtained, and completed the invention.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to effectively control the microvibration of a power transformer, a motor, etc. generated from an audio device, and to reduce the sound quality by not only the internal microvibration but also the vibration from the outside, the sound image localization, etc. It is possible to provide an insulator that does not adversely affect the.
In addition, since the attenuator with a triangular cross-section is installed on the bottom of the leg body, the degree of dependence due to the structure can be increased, so changes in sound quality due to variations in material components and blends can be reduced, further improving sound quality. Can be realized.
INDUSTRIAL APPLICABILITY The present invention is far superior to conventional ones in that there is no unpleasant low-frequency vibration, pleasant natural sounding, extension of mid- and low-pitched tone and high-pitched tone, sound quality and extension of each musical instrument or vocal unit, and stereoscopic effect of sound. Further, it is possible to improve the acoustic characteristics of the acoustic device by efficiently suppressing the slight vibration of the acoustic device and enhancing the cutoff property of the vibration transmission to the mounting surface.

Overall view of an acoustic insulator according to an embodiment of the present invention with a part broken away 1 is a perspective view of an acoustic insulator according to an embodiment. Bottom view of the acoustic insulator according to the embodiment attached to the bottom surface of the audio device Sectional drawing of the acoustic insulator which concerns on embodiment attached to the bottom face of an audio equipment. Sectional drawing of the attenuator of the acoustic insulator which concerns on embodiment. A perspective view of an acoustic insulator according to a second embodiment. 3 is a perspective view of an acoustic insulator according to a third embodiment. FIG. Perspective view of acoustic insulators according to first and second reference examples . Perspective view of acoustic insulators according to third and fourth reference examples . Perspective view of acoustic insulators according to fifth and sixth reference examples . Perspective view of acoustic insulators according to seventh and eighth reference examples . Perspective view of acoustic insulators according to ninth and tenth reference examples . Perspective view of acoustic insulators according to eleventh and twelfth reference examples . Perspective view of acoustic insulators according to 13th and 14th reference examples . 4 is a perspective view of an acoustic insulator according to Examples 4 and 5. FIG. Perspective view of a conventional acoustic insulator

Hereinafter, the acoustic insulator according to the present invention will be described in detail with reference to FIGS.

<1> Outline of Sound Insulator The sound insulator 100 is a member that also functions as a support leg and a vibration damping member that are attached to a plurality of locations on the bottom surface 41 of the sound device 40.
To describe with reference to FIGS. 1 to 3, the acoustic insulator 100 includes a columnar leg body 20 and a bottom surface 22 of the leg body 20 with a predetermined gap G from the center of the leg body 20 toward the outer peripheral portion. A plurality of attenuators S ₁ each having a triangular cross section are arranged toward each other, and a stepped mounting screw 30 for mounting the leg body 20 on the bottom surface of the acoustic device 40.
In the present invention, in order to improve the acoustic performance of the audio device 40, a plurality of attenuators S ₁ having a triangular cross-section are radially provided at predetermined intervals G in the vicinity of the peripheral edge of the leg body 20 excluding the central portion. It is formed by arranging at.
In the present embodiment, the audio device 40 will be described, but the present invention can be applied to a multimedia PC, a speaker, a musical instrument, and the like.

<2> Leg Body The leg body 20 is a columnar body having an upper surface 21 and a bottom surface 22, and the upper surface 21 and the bottom surface 22 are both smooth and parallel to each other.
The leg body 20 has a stepped hole 23 having a different diameter at the center thereof.
The leg body 20 preferably has a circular planar shape, but may have an elliptical shape or a polygonal shape, and the planar shape of the leg body 20 is not particularly limited. The shape may be any flat column shape.

<2.1> Stepped Hole Explaining with reference to FIG. 4, the stepped hole 23 includes a large diameter hole 23a formed on the bottom surface 22 side of the leg body 20 and a small diameter hole 23b. The mounting screw 30 is inserted from the side of the radial hole 23a.

<2.2> Attenuator On the bottom surface 22 of the leg body 20, an attenuator S ₁ having a triangular cross section is formed with a gap G therebetween.
The attenuator S ₁ is formed in the outer peripheral direction of the leg body 20 from the stepped hole 23 at the center.
In this example, four attenuators S ₁ are radially formed on the bottom surface 22 of the leg body 20 at equal intervals, but the number of the attenuators S ₁ may be 3 or more.
The attenuator S ₁ is formed integrally with the leg body 20 by machining the bottom surface 22 of the leg body 20.
The "machining" is not limited to cutting and press molding, and includes known molding means such as injection molding and three-dimensional printing by a 3D printer.

<2.3> Dimensions of Attenuator Referring to FIG. 5, in the present example, the attenuator S ₁ has a uniform height H of a triangle over the entire length, and the width of the attenuator 21 on the bottom surface 22 side. It shows a form in which (the length of the base of the triangle) W is uniform.
“Equal” means that the dimension of the attenuator S ₁ on the stepped hole 23 side of the leg body 20 and the dimension of the outer peripheral surface side of the leg body 20 are equal.

In this example, the form in which the width W of the attenuator S1 is formed uniformly will be described, but the width W may be nonuniform.
There are two forms of the width W of the attenuator S ₁ that is non-uniform, that is, the width on the stepped hole 23 side of the leg body 20 is larger and smaller than the width on the outer peripheral side of the leg body 20. Including.

<2.4> Height and Width of Attenuator The height H of the attenuator S ₁ is preferably in the range of _{1 to} 15 mm. The more preferable height H of the attenuator S ₁ is 2 to 10 mm.
The width W of the attenuator S ₁ is preferably in the range of ₁ to 30 mm.

<3> Material of Leg Body and Attenuator As the material of the leg body 20 and the attenuator S ₁ , both a microporous structure having fine pores inside and a non-porous structure having no fine pores inside can be used. For example, resins, metals such as copper and iron, concrete compositions, natural stones, woods, ceramics and the like can be used, or they may be used in combination.

<3.1> If the illustrative leg body 20 and attenuator S ₁ made of resin is formed of a resin, leg body 20 and attenuator S ₁ is molded resin composition comprising a phenolic thermosetting resin and the filler A microporous structure having fine pores inside is preferable.
Specifically, the leg body 20 and the attenuator S ₁ are made of a resin composition including a phenolic thermosetting resin and a filler, and the molded material has a specific gravity of 1.5 to 5.0 and a porosity of 2 to 20%, and the average pore diameter is 0.1 to 3.0 μm.
By setting the specific gravity of the molded material to 1.5 to 5.0, the porosity to 2 to 20%, and the average pore diameter to 0.1 to 3.0 μm, it is possible to damp the required fine vibration. It has excellent acoustic performance.
The specific gravity of the material can be adjusted by appropriately selecting the type of filler to be added to the resin composition.

<3.2> Porous Filler The porosity and the average pore diameter can be adjusted by changing the molding conditions such as molding temperature, molding pressure, and molding time, but the resin composition is porous as a part of the filler. By adding the filler in an amount of 10 to 35% by weight based on the total amount of the resin composition, a molded product having a desired porosity and average pore diameter can be obtained without undue examination of molding conditions.

When 10 to 35% by weight of the porous filler is added to the resin composition as a part of the filler, the molding temperature is 130 to 170° C., the molding pressure is 20 to 40 MPa, and the molding time is 2 to 15 minutes. Within the range, it becomes possible to obtain a molded product having a desired porosity and average pore diameter.

As the porous filler, a porous filler having an average pore diameter of 2 nm or less and a microporous structure, a porous filler having an average pore diameter of more than 2 nm and less than 50 nm, and an average pore diameter of A porous filler having a macroporous structure of 50 nm or more can be used.

Among these, by using a porous filler having a microporous structure, the amount of the porous filler added can be suppressed, the degree of freedom in adjusting the amount of the other filler added increases, and the specific gravity can be easily adjusted. Therefore, it is preferable.

Examples of the porous filler having micropores include zeolite, activated carbon, porous silica, and porous alumina, and one or more of these may be selected and used.

In addition, the above-mentioned specific gravity used the numerical value measured by the underwater substitution method, and the porosity and the average pore diameter used the numerical value measured by the mercury porosimeter which cut out the test piece from the leg main body.

<3.3> Examples of phenolic thermosetting resin Examples of the phenolic thermosetting resin include straight phenol resin, resins obtained by modifying phenol resin with various elastomers such as cashew oil, silicone oil, and acrylic rubber, and phenols. Examples include aralkyl-modified phenolic resins obtained by reacting aralkyl ethers with aldehydes, thermosetting resins in which various elastomers, fluoropolymers and the like are dispersed in phenolic resins, and these may be used alone or in combination. The above can be used in combination.

<3.4> Addition amount of phenolic thermosetting resin The phenolic thermosetting resin is added in an amount of 5 to 25% by weight based on the total amount of the resin composition. If the amount of the phenolic thermosetting resin added is less than 5% by weight, cracks are likely to occur in the molded product, and if it exceeds 25% by weight, blisters are likely to occur inside the molded product.

<3.5> Other Fillers As fillers other than the porous filler, organic fibers such as aramid fiber, PAN fiber and cellulose fiber, glass fiber, inorganic fiber such as rock wool, calcium carbonate, barium sulfate, Inorganic particles such as mica, talc, wollastonite, vermiculite, alumina, silica, zirconia and zirconium silicate, carbonaceous particles such as coke and graphite, rubber particles such as NBR particles and SBR particles, copper, brass, bronze, aluminum , Particles made of metal such as stainless steel, steel, and cast iron, and short fibers, and these may be used alone or in combination of two or more.

<3.6> Method for manufacturing leg body The leg body 20 is formed by a mixing step of uniformly mixing a resin composition containing a predetermined amount of a phenolic thermosetting resin and a filler with a mixer, and a thermoforming metal having a predetermined shape. It is manufactured through a molding process in which it is charged into a mold and molded at a temperature of 130 to 170° C. and a pressure of 20 to 40 MPa for 2 to 15 minutes to form a columnar shape, and a surface of the columnar body is polished to a predetermined surface roughness. ..
The attenuator S ₁ may be formed during the above-described molding process, or the bottom surface 22 may be processed after the leg body 20 is manufactured.
The manufacturing method of the leg body 20 described above is an example, and the present invention is not limited to the above steps and manufacturing conditions.

[Operation of sound insulator]
A plurality of actions of the acoustic insulator 100 will be described with reference to FIGS.

<1> Vibration damping effect of the leg body If the bottom surface 41 of the audio device 40 is completely fixed with screws without play between the bottom surface 41 and the upper surface of the leg body 20, the vibration damping effect of the leg body 20 will be significantly increased. The effect of damping the slight vibration is halved.
On the other hand, when the leg body 20 is movably attached to the leg body 20 with play in the vertical direction via the mounting screw 30, the leg body 20 moves within the play range due to the slight vibration generated in the acoustic device 40. The slight vibration of the acoustic device 40 is transmitted to the leg body 20.
When the leg body 20 has a microporous structure, the leg body 20 itself exerts a high vibration damping function against microvibrations, and the vibration damping function of the leg body 20 is greater than when the leg body 20 is completely fixed. Is greatly improved.

<2> Action of Attenuator The leg body 20 concentrates nearer the center in the high-frequency vibration and near the outer periphery in the low-tone vibration, but as shown in FIG. By having a plurality of attenuators S ₁ each having a triangular cross section, it is possible to disperse the vibrations in the respective frequency portions.
Further, by adjusting the height H, width W, and inclination angle of the triangular section of the attenuator S ₁ , it is possible to select and attenuate a proper frequency.
In addition, since the attenuator S ₁ having a triangular cross section is provided on the bottom surface of the leg body 20, the degree of dependence due to the structure can be increased, and thus the fluctuation of the effect due to the variation of the components and the composition of the material is not affected. It is possible to improve the acoustic characteristics of the acoustic device 40 by improving the cutoff property of the vibration transmission to the mounting surface 50 while efficiently suppressing the slight vibration, and further, to minimize the change in the sound quality and to obtain the high sound quality. The acoustic insulator 100 that is maintained and has a preferable sound performance such as a wide sound field, a comfortable natural sound, extension of mid- and low-pitched and high-pitched sounds, sound separation, and stereoscopic effect of sound becomes a sound insulator 100 that is far superior to conventional ones.

Hereinafter, the present invention will be specifically described by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples.

1. Method for manufacturing leg body The resin composition having the composition shown in Table 1 is mixed for 5 minutes with a Ledige mixer, and the obtained mixture is put into a thermoforming mold, and the diameter is 50 mm and the thickness is about 50 mm under the conditions shown in Table 1. After molding into a cylindrical shape of 15 mm, the top surface and the bottom surface are polished by about 0.5 mm each to have a thickness of 14 mm, and finally a stepped hole (large diameter hole: diameter 9 mm x length 7 mm, small diameter hole: diameter 4 mm x A leg body was obtained by drilling a length of 7 mm).

2. Other Examples A plurality of acoustic insulators 100 having the attenuators S _{1 of} different lengths and shapes on the bottom surface of the leg body 20 were manufactured.
The first embodiment has the form shown in FIGS. 1 to 5 described above, and the attenuator S ₁ is formed uniformly from the central portion side to the outer peripheral side of the leg body 20.
The second embodiment has a form shown in FIG. 6, and an attenuator S ₁ having a triangular cross section is formed continuously from the center side of the leg body 20 toward the outer peripheral side so that the vertices draw a curved line. The shape of the attenuator S ₁ is such that the width W is gradually increased from the central portion side of the leg body 20 to the outer peripheral side thereof.
The third embodiment has the form shown in FIG. 7, and the attenuator S ₁ having a trapezoidal cross section is formed uniformly from the central portion side of the leg body 20 toward the outer peripheral side. The attenuator S ₁ having a trapezoidal cross section may have a width W gradually increasing from the central portion side to the outer peripheral side of the leg body 20 as in the second embodiment. Further, the cross-section may have an arched shape, and the width W may be gradually increased from the central portion side of the leg body 20 to the outer peripheral side thereof.
Reference Examples of the first and second FIG 8a, in the form shown in FIG. 8b, in which were disposed cross-sustaining over a conical attenuator S ₁ from the central portion side of the leg body 20 toward the outer periphery .. The second reference example of FIG. 8b is different from the first reference example of FIG. 8a in that the shape of the attenuator S ₁ is the size of the root from the center side to the outer peripheral side of the leg body 20 (bottom of the cone). Is gradually becoming larger. The conical attenuator S ₁ may have a cylindrical or spherical shape instead of the conical shape.
Reference Example of the 3 and 4 Figure 9a, in the form shown in FIG. 9b, which was arranged cross-sustaining over attenuator S ₁ exhibits a triangular cross-section from the center side of the leg body 20 toward the outer periphery is there. In the fourth reference example of FIG. 9b, compared with the third reference example of FIG. 9a, the shape of the attenuator S ₁ is such that the width W is gradually increased from the center side of the leg body 20 to the outer peripheral side. is there. The attenuator S ₁ may have a trapezoidal cross section.
Reference Example of the 5 and 6 FIG. 10a, in the form shown in FIG. 10b, in which were disposed cross-sustaining over attenuator S ₁ exhibits a triangular cross-section from the center side to the outer peripheral side. In the fifth reference example of FIG. 10a, the attenuator is formed in a direction orthogonal to the radial direction of the stepped hole 23 in the center of the leg body 20, and in the sixth reference example of FIG. 10b, the attenuator is formed in the center of the leg body 20. It is formed concentrically with the stepped hole 23. The attenuator S ₁ may have a trapezoidal cross section.
The seventh and eighth reference examples are the configurations shown in FIGS. 11a and 11b, and similarly to the third and fourth reference examples , an attenuator S ₁ having a triangular cross section is provided from the center side of the leg body 20 to the outer peripheral side. over to is obtained by arranged Intermittent manner, is inclined to both end faces of the attenuator S ₁ are shorter top side of the attenuator S _1. The attenuator S ₁ may have a trapezoidal cross section.
The ninth to twelfth reference examples are the forms shown in FIGS. 12a, 12b, 13a, and 13b, and like the first and second reference examples , the conical attenuator S ₁ is attached to the center of the leg body 20. is obtained by arranged cross-sustaining over a part side to the outer peripheral side, is obtained by the generatrix of the cone of the attenuator S ₁ in an arc shape. In the ninth reference example of FIG. 12a and the tenth reference example of FIG. 12b, the generatrix of the attenuator S ₁ has a concave arc shape, and the eleventh reference example of FIG. 13a and the twelfth reference example of FIG. In the reference example, the generatrix of the attenuator S ₁ has a convex arc shape. The attenuator S ₁ may be cylindrical or spherical.
The thirteenth and fourteenth reference examples are the configurations shown in FIGS. 14a and 14b, in which the attenuator S ₁ having a triangular cross section is formed from the center side of the leg body 20 toward the outer peripheral side, and the adjacent attenuators S ₁ are formed. The bottom surface 22 of the leg body 20 in the shape of a fan between ₁ is formed to be inclined from the central portion side to the outer peripheral side. In the fourteenth reference example of FIG. 14b, compared with the thirteenth reference example of FIG. 14a, the shape of the attenuator S ₁ is such that the width W is gradually increased from the center side of the leg body 20 to the outer peripheral side. is there. The attenuator S ₁ may have a trapezoidal cross section.
Embodiments 4 and 5 are the forms shown in FIGS. 15a and 15b, in which an attenuator S ₁ having a triangular cross section is formed from the central portion side of the leg body 20 toward the outer peripheral side, and the attenuator S ₁ between adjacent attenuators S ₁ is formed. The bottom surface 22 of the leg body 20 having a fan shape is formed by inclining from the outer peripheral side to the central side. In the fifth embodiment of FIG. 15b, the shape of the attenuator S ₁ is formed such that the width W is gradually increased from the central portion side to the outer peripheral side of the leg body 20 as compared with the fourth embodiment of FIG. 15a. The attenuator S ₁ may have a trapezoidal cross section.

3. Acoustic Performance Evaluation Under the conditions shown in Table 2, the acoustic performance of the acoustic insulator of Example 1 and the conventional acoustic insulator (FIG. 16) were evaluated as follows.

3.1. Evaluation method For the evaluation, an audio room designed for acoustics was used.
For the audio equipment, a power amplifier (ESOTERIC A-03), a D/A converter, a preamplifier, a CD player (ESOTERIC K-05), and a large speaker (B&W 801D) were used. The power amplifier, the D/A converter that outputs an analog signal whose sound quality change is easy to understand, and the speaker for the conventional example are mounted under the speaker, respectively, at three points (front left and right two places, back center one place). ..

The evaluation items are (1) "unpleasant low-frequency vibration", (2) "comfortable natural sound", and (2) further "extension of mid-low range", "extension of treble range" and "roughness". "And "three-dimensional feeling of sound".

For the evaluation songs, sound sources with different frequencies emphasized by the instrument used were prepared, and a comprehensive evaluation was made.
・New music (voice, guitar, bass, drum: 30Hz-18kHz: center 400Hz-3kHz)
・Jazz (piano: 30Hz-5kHz: center 200Hz-1kHz)
・Classic (Orchestra: 100Hz-4kHz: Center 300Hz-2kHz)
・Rock (guitar, bass, drum, keyboard: 40Hz-18kHz: center 100Hz-1kHz)

The evaluator selected 20 employees with different tastes, sexes, and ages (22 to 62 years old) from the employees, and averaged the results. The acoustic performance evaluation criteria are as follows.
◎: 15 to 20 people rated as good ○: 10 to 14 people rated as good

3.2. Evaluation results As is clear from the results in Table 2, as compared with the conventional acoustic insulator, unpleasant low-frequency vibrations are suppressed, and the contour of the sound, the extension of the mid-low range, the extension of the high range, and the smoothness, An excellent acoustic insulator was obtained due to favorable acoustic performance such as stereoscopic effect of sound.

100...-Insulator 20 for acoustics...Leg body 21...Leg body upper surface 22...Leg body bottom surface 23...Leg body stepped hole 30. --- Sound collecting mounting screw 40 --- Acoustic device 41 --- Bottom surface 50 of acoustic device --- Mounting surface S ₁ --- Attenuator

Claims (3)

An acoustic insulator having a leg body as a main member,
In the center of the leg body, a stepped hole for movably attaching the leg body to the bottom surface of the acoustic device with a mounting screw is formed,
On the bottom of the leg body, a triangular cross section toward the outer peripheral side from the center side of the leg body, an attenuator exhibiting a trapezoidal cross section or a cross section arched radially, and are moved away from each other, by the stepped bore A plurality of protrusions are provided so as to form a second space communicating from the formed first space to the outer peripheral side of the leg body,
The attenuator has a uniform or different width of a triangular cross section, a trapezoidal cross section or an arched cross section that extends from the center part side of the leg body to the outer peripheral part side,
It said plurality of attenuator, characterized in that the whole mounting surface is the height of the support leg forming said by contacting the second space,
Sound insulator. The acoustic insulator according to claim 1,
In the attenuator, the bottom surface between the adjacent attenuators is arranged from the outer peripheral side to the central part side so that the height of the triangular cross section, the trapezoidal cross section or the arched cross section becomes higher on the central part side of the leg body part. characterized that you formed to be inclined over the,
Sound insulator. The acoustic insulator according to any one of claims 1 and 2,
The attenuator triangular cross section, the width of the trapezoidal cross-section or cross-section arched, characterized that you have narrowed at the center portion of the leg body part,
Sound insulator.

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