JP6651562B2 - Acoustic insulator - Google Patents

Description

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

2. Description of the Related Art It is known that not only internal microvibrations generated from vibration sources such as a built-in power transformer and a motor but also external vibrations lower sound quality and adversely affect sound image localization.
Generally, an insulator is interposed between the acoustic device and the mounting surface (floor surface) to absorb or quickly release these vibrations.
The insulator is made of a hard material such as a stone or metal in addition to an elastic material such as rubber or plastic, and has various shapes.
As a conventional insulator, for example, Patent Literature 1 discloses an insulator that is supported at a single point by using a spike having a single conical shape, and Patent Literature 2 discloses an insulator that combines a cylindrical resin member and a coil spring. Patent Literature 3 discloses an insulator in which a spike and a coil spring are combined.
Patent Literature 4 discloses an insulator that forms a hollow sound collecting space at the center of the bottom surface of a leg body formed by molding a resin composition into a column shape, and also forms a radial sound emitting space that communicates with the sound collecting space. Have been.
Although the insulator described in Patent Literature 4 can solve the problems of Patent Literatures 1 to 3 to some extent, there is still room for improvement in the effect of suppressing the microvibration of the audio equipment, and there is room for improvement in the acoustic composition due to the variation of the components and the composition of the materials used for the leg body. The sound quality of the device is likely to change.
Conventional insulators provide high quality acoustic characteristics to audio equipment, but their effects are limited and further improvements are required.

Japanese Patent No. 348987 JP 2013-12616 A JP 2012-156802 A JP-A-2006-86408

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to improve the effect of suppressing microvibration of an audio device and enhance the ability to interrupt vibration transmission to a mounting surface, thereby improving the acoustic device. It is an object of the present invention to provide a sound insulator for improving the acoustic characteristics of the sound.
It is still another object of the present invention to provide a sound insulator capable of realizing high sound quality by reducing a change in sound quality due to a variation in components and composition of materials used for the insulator.
Still another object of the present invention is to reduce unpleasant low-frequency vibrations to provide a pleasant natural sound, middle and low frequency range and high frequency range expansion, sound quality and expansion of each musical instrument or vocal body, and favorable acoustic performance such as sound three-dimensionality. SUMMARY OF THE INVENTION It is an object of the present invention to provide an acoustic insulator which is much more excellent than before.

The first invention of the present application is a sound insulator having a leg main body as a main member, and a stepped hole for movably mounting the leg main body to a bottom surface of the audio equipment by a mounting screw at a center portion of the leg main body. Is formed on the bottom surface of the leg body, and an attenuator having a concave arcuate cross section from the center to the outer peripheral side of the leg body toward the bottom from the apex is formed radially and mutually. and is separated, the plurality projected as a stepped hole communicating with the outer peripheral portion side of the leg body, Ri width of the attenuator uniform or different, said plurality of attenuators, whole mounting surface It is characterized in that it becomes a supporting leg at the height of contact .
The second invention of the present application is the acoustic insulator of the first invention, wherein the bottom surface between the adjacent attenuators is formed so as to be inclined from the center to the outer periphery or from the outer to the center. It is characterized by .

Conventionally, as shown in FIG. 7, a plurality of sound emitting spaces extending from the center of the leg body toward the outer peripheral side are formed on the bottom side of the main body, but the shape of the sound emitting groove alone improves the acoustic characteristics. I couldn't do that.
By simply adding a sound emission groove to the leg body, there is no means to efficiently emit the vibration that diffuses inside while blocking the external vibration, so it will be diffusely reflected and you will feel a delay in the auditory phase, The outline was unclear. At the same time, the use of felt as a damping mat attenuates the requisite sound and reduces the clarity.
Furthermore, the movement of the vibration of the leg body concentrates near the center as the vibration of the treble increases, and it concentrates near the outer periphery as the vibration of the bass increases.Therefore, in the insulator using the conventional spike, when radiating the vibration, This mixes low frequency vibrations, concentrating on one point and causing diffuse reflection, leading to deterioration of sound quality. Also, since the spike receiving portion needs to absorb sound, the receiving portion has a large influence.
The inventor conducted intensive research on a plurality of shapes, and found that the cross-section was made substantially triangular, thereby effectively attenuating high-frequency vibrations at the center of the insulator and vibrations at the outer periphery, and the material used for the insulator. For acoustics that have significantly better acoustic performance than before while avoiding the effects of component and composition variations, increase the occupancy of sound quality due to the structure, and minimize changes in sound quality due to material composition errors. The inventors have found that an insulator can be obtained, and have completed the invention.

According to the present invention, it is possible to effectively control micro-vibration of a power transformer, a motor, and the like generated from an audio device, and furthermore, not only internal micro-vibration, but also lowering sound quality due to external vibration, for sound image localization and the like. An insulator having no adverse effect can be provided.
In addition, the cross section of the leg body is provided with an attenuator having a substantially triangular cross-section, that is, a cross-sectional shape in which the hypotenuse is a concave arc shape. A change in sound quality can be reduced, and further higher sound quality can be realized.
The present invention is free from unpleasant low-frequency vibrations, has a pleasant natural sound, extends middle and low frequencies and treble, the sound quality and elongation of each musical instrument and vocal main body, and the preferable acoustic performance such as three-dimensional effect of sound is much better than before. In addition, it is possible to improve the sound characteristics of the acoustic device by efficiently suppressing the micro vibration of the acoustic device, increasing the blocking 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 equipment Sectional view of the acoustic insulator according to the embodiment attached to the bottom surface of the audio equipment Sectional view of the attenuator of the acoustic insulator according to the embodiment. FIG. 7 is a perspective view of the acoustic insulator according to the second embodiment. 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 serves as a support leg and a vibration damping member attached to a plurality of locations on the bottom surface 41 of the sound device 40.
Referring to FIGS. 1 to 3, the acoustic insulator 100 includes a pillar-shaped leg main body 20 and a bottom surface 22 of the leg main body 20 separated from the center of the leg main body 20 by a predetermined distance G in an outer peripheral direction. toward including multiple arrangement the cross-section substantially triangular shape, i.e. an attenuator S ₁ of the cross-sectional shape which hypotenuse is concave arcuate, the mounting screw 30 of the stepped mounting the leg body 20 to the bottom surface of the acoustic device 40, a .
In the present invention, in order to improve the acoustic performance of the acoustic device 40, leg body attenuator substantially triangular plurality of cross-section at predetermined intervals G near the peripheral portion excluding the central portion of the bottom surface 22 S ₁ of 20 Are radially arranged.
In the present embodiment, the audio device 40 is described, but the present invention can be applied to a multimedia PC, a speaker, a musical instrument, and the like.

<2> Leg Main Body The leg main body 20 is a columnar body having an upper surface 21 and a bottom surface 22, and both the upper surface 21 and the bottom surface 22 are smooth and parallel to each other.
The leg body 20 has a stepped hole 23 having a different diameter at the center thereof.
The planar shape of the leg body 20 is preferably circular, but may be elliptical or polygonal, and there is no particular restriction on the planar shape of the leg body 20. The shape may be a flat column.

<2.1> Stepped Holes Referring to FIG. 4, the stepped holes 23 include a large-diameter hole 23 a and a small-diameter hole 23 b formed on the bottom surface 22 side of the leg body 20. The mounting screw 30 is inserted from the diameter hole 23a side.

<2.2> to the bottom surface 22 of the attenuator leg body 20, at a distance G, the hypotenuse toward the bottom surface from the vertex to form an attenuator S ₁ exhibits a concave arcuate cross-sectional shape.
Attenuator S ₁ is formed from a stepped bore 23 of the central portion to the outer circumferential portion direction of the leg body 20.
In the present embodiment shows a configuration which is formed radially attenuators S ₁ of four equally spaced on a bottom surface 22 of the leg body 20, the attenuator S ₁ may if three or more.
The attenuator S <b> ₁ is formed integrally with the leg body 20 by machining the bottom surface 22 of the leg body 20.
“Machining” is not limited to cutting or press molding, but also includes known molding means such as injection molding, three-dimensional printing with a 3D printer, and the like.

<2.3> Referring to Dimensions 5 of the attenuator, the attenuator S ₁ in this example is a uniform height H cross section shaped substantially triangular over the entire length, the bottom of the attenuator S ₁ The width W (length of the substantially triangular base) on the side 22 is gradually increased from the center of the leg body 20 to the outer periphery.
Width W of the attenuator S ₁ may be gradually larger width W over the outer periphery of the leg body 20 to the center side may be equal. By "uniform" it is meant the size of the attenuator S ₁ of the stepped hole 23 side of the leg body 20, that is equal to the outer peripheral side of the dimension of the leg body 20.

<2.4> Height and width of attenuator The height H of the attenuator S1 is preferably in the range of _{1 to} 15 mm. More preferred the height H of the attenuator _{S 1} is 2 to 10 mm.
Further, the width W of the attenuator S1 is preferably in the range of ₁ to 30 mm.

<3> The leg body and attenuator materials of leg body 20 and attenuator S ₁ any possible use of non-porous structure which does not have fine pores in the microporous structure having fine pores inside Yes, for example, resins, metals such as copper and iron, concrete compositions, natural stones, wood, ceramics, and the like can be used, or a combination thereof may be used.

<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 preferred.
Specific To illustrate leg body 20 and attenuator S ₁ is made of a resin composition comprising a phenolic thermosetting resin and the filler, the specific gravity of the molded material is 1.5 to 5.0, porosity 2 to 20%, and the average pore size 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, the required fine vibration can be attenuated. No, it has excellent acoustic performance.
The specific gravity of the material can be adjusted by appropriately selecting the type of filler added to the resin composition.

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

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

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

  Above all, by using a porous filler having a microporous structure, the amount of the porous filler to be added can be suppressed, the degree of freedom in adjusting the amount of the other filler to be added is increased, and the specific gravity is easily adjusted. It is preferred.

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

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

<3.3> Examples of phenolic thermosetting resins Examples of phenolic thermosetting resins include straight phenolic resins, resins obtained by modifying phenolic resins 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, etc. are dispersed in phenolic resin, and the like. These 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 is less than 5% by weight, cracks are likely to occur in the molded article, and if it exceeds 25% by weight, blisters are likely to be generated inside the molded article.

<3.5> Other fillers As fillers other than the porous filler, organic fibers such as aramid fibers, PAN fibers, and cellulose fibers; inorganic fibers such as glass fibers and 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, and aluminum And particles and short fibers made of metal such as stainless steel, steel, cast iron and the like, and these can be used alone or in combination of two or more.

<3.6> Manufacturing Method of Leg Body The leg body 20 is formed by mixing a resin composition in which a predetermined amount of a phenolic thermosetting resin and a filler are mixed by a mixer. It is put into a mold, and is manufactured through a molding step of forming into a column by molding at a temperature of 130 to 170 ° C. and a pressure of 20 to 40 MPa for 2 to 15 minutes, and a polishing step of polishing the surface of the columnar body to a predetermined surface roughness. .
Attenuator S ₁ may be formed on the time of the molding process, it may be formed by processing a bottom surface 22 after production of the leg body 20.
The above-described method of manufacturing the leg body 20 is an example, and is not limited to the above-described steps and manufacturing conditions.

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

<1> Vibration Suppressing Effect of Leg Body If the bottom surface 41 of the audio device 40 is completely fixed with a screw without any play between the bottom surface 41 and the upper surface of the leg body 20, the vibration damping effect of the leg body 20 is large. And the damping effect of micro-vibration is halved.
On the other hand, when the leg body 20 is movably attached with play in the vertical direction via the mounting screw 30, the leg body 20 moves within the range of play due to the slight vibration generated in the audio device 40. Then, the minute 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 microvibration, and the vibration damping function of the leg body 20 is smaller than when the leg body 20 is completely fixed. Is significantly improved.

<2> Action of Attenuator The leg body 20 concentrates near the center as the vibration of the treble increases, and concentrates near the outer periphery as the vibration of the bass increases. However, as shown in FIG. by multiple section has a damper S ₁ of substantially triangular shape, can release vibration is dispersed to the respective frequency portion. In particular, by making the slope of the attenuator S ₁ and concave arcuate attenuator S ₁ has a shape with a gentle curve over the top portion to the bottom surface 22, to distribute the vibration frequency, efficiently audio equipment 40 Vibration can be emitted, and a change in sound quality due to a variation in material composition can be reduced.
Also, the attenuator S ₁ of the cross-section is substantially triangular height H and width W, by adjusting the inclination angle, it is possible to attenuate to select the proper frequency.
Moreover, since cross-section on the bottom of the leg body 20 is intended to provide an attenuator S ₁ having a substantially triangular shape, without being influenced by fluctuations of the effect component and the composition of a variation of the so raised reliance material due to structural acoustic It is possible to improve the sound characteristics of the audio device 40 by improving the isolation of the transmission of the vibration to the mounting surface 50 while efficiently suppressing the micro vibration of the device 40, and further minimize the change in the sound quality. Maintaining high sound quality, wide acoustic field, comfortable natural sound, expansion of middle and low frequency range and high range, separation of sound, three-dimensional sound sound, and other excellent acoustic performance make the acoustic insulator 100 much more excellent than before. .

  Hereinafter, the present invention will be described specifically with reference to 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 was mixed with a Loedige mixer for 5 minutes, and the obtained mixture was poured into a thermoforming mold. After molding into a 15 mm cylindrical shape, the top and bottom surfaces are polished by about 0.5 mm each so as to have a thickness of 14 mm, and finally a stepped hole (large diameter hole: diameter 9 mm × length 7 mm, small diameter hole: diameter 4 mm × (Length: 7 mm) to obtain a leg body.

2. It was produced a plurality of acoustic insulator 100 having an attenuator S ₁ of varying length and shape to the bottom surface of the other embodiments leg body 20.
Example 1 is an embodiment shown in FIG. 1 to 5 described above, the attenuator S ₁ are gradually larger width W over the central portion side of the leg body 20 to the outer peripheral side.
Example 2 is an embodiment shown in FIG. 6, cross section toward the outer peripheral side to form an attenuator S ₁ having a substantially triangular shape from the central portion of the leg body 20, attenuator S ₁ of the leg body 20 with gradually larger width W over the outer peripheral side from the center side, over the bottom surface 22 of the leg body 20 exhibiting a fan between the attenuator S ₁ adjacent the outer peripheral side to the center side, it is inclined To form. The bottom surface 22 may be formed to be inclined from the outer peripheral side to the center.

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. 7) were evaluated as follows.

3.1. Evaluation method The evaluation was performed using an audio room designed for sound.
The audio equipment used was 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). Example 1 and a conventional acoustic insulator were mounted on a four-point support under a power amplifier and a D / A converter that outputs an analog signal whose sound quality change is easy to understand.

  The evaluation items were (1) "unpleasant low-frequency vibration", (2) "comfortable natural sound", and (2) further "elongation of middle and low frequencies", "elongation of high frequencies", and "coarse lubricity". "And" Sound 3D effect ".

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

The evaluators selected 20 employees with different tastes, genders, and ages (22 to 62) from the employees, and averaged the results. The evaluation criteria for the acoustic performance are as follows.
◎: 15 to 20 evaluated as good ○: 10 to 14 evaluated as good

3.2. Evaluation Results As is evident from the results in Table 2, uncomfortable low-frequency vibrations are suppressed, and the contour of the sound, the extension of the middle and low range, the extension of the high range, the coarseness, An excellent insulator for sound was obtained by favorable sound performance such as three-dimensional sound.

100 ···· Acoustic insulator 20 ···· Leg body 21 ··· Upper surface 22 of the leg body ··· Bottom surface 23 of the leg body ····· Stepped hole 30 of the leg body .... pickup mounting screw 40 ----- audio equipment 41 ----- bottom 50 ----- mounting surface _S 1 ..... attenuator audio equipment

Claims (2)

An acoustic insulator having a leg body as a main member,
At the center of the leg body, a stepped hole for movably attaching the leg body to the bottom surface of the audio device with a mounting screw is formed,
On the bottom surface of the leg body, an attenuator having a concave arcuate cross-sectional shape whose oblique side from the vertex toward the bottom surface from the center side to the outer peripheral side of the leg body is radially separated from each other, A plurality of protrusions are provided so as to communicate with the outer peripheral side of the leg body from the stepped hole ,
Wherein Ri attenuator width uniform or different,
The plurality of attenuators are characterized by being supporting legs having a height that is entirely in contact with the mounting surface ,
Sound insulator. The acoustic insulator according to claim 1,
The bottom surface between the adjacent attenuators, is formed to be inclined from the central portion side to the outer peripheral side, or from the outer peripheral side to the central portion side,
Sound insulator.

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