JP2018033083A - Insulator for audio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulator for an audio device which can realize high quality sound by reducing sound quality change due to variations in ingredients and blending of materials used for the insulator.SOLUTION: A plurality of sound emitting grooves 24 having a V-shaped cross section in a direction from a center side to an outer peripheral side of a leg body 20 are formed on a bottom surface 22 of the leg body 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insulator for audio equipment that supports audio equipment such as an audio equipment amplifier, a CD player, a DVD player, a BD player / recorder, and a TV.

It is known that acoustic devices not only have internal fine vibrations generated from vibration sources such as built-in power transformers and motors, but also fine external vibrations deteriorate sound quality and adversely affect sound localization.
In general, an insulator is interposed between the acoustic device and the mounting surface (floor surface) to absorb or quickly release these fine vibrations.
Insulators are made of hard materials such as stone and metal in addition to elastic materials such as rubber and plastic, and the shapes thereof are various.
As a conventional insulator, for example, Patent Document 1 discloses an insulator that supports a single point using a conical spike, and Patent Document 2 discloses an insulator that combines a cylindrical resin member and a coil spring. Patent Document 3 discloses an insulator in which a spike and a coil spring are combined.
Patent Document 4 discloses an insulator that forms a recessed sound collecting space in the center of the bottom surface of a leg body formed by molding a resin composition into a columnar shape, and that forms a radial sound emitting space that communicates with the sound collecting space. Has been.
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 fine vibration suppression effect of the acoustic equipment, and the acoustics due to variations in the ingredients and blending of materials used for the leg body The sound quality of the equipment is easy to change.
Conventional insulators impart high-quality acoustic characteristics to acoustic equipment, but their effects are limited and further improvements are required.

JP 2007-142676 A JP 2013-126061 A JP 2012-156802 A Japanese Patent Laid-Open No. 2006-86408

The present invention has been made in view of the above points, and an object of the present invention is to reduce the change in sound quality due to variations in the components and blending of materials used in the insulator, thereby realizing high-quality sound. The object is to provide an insulator for equipment.
Furthermore, another object of the present invention is to reduce unpleasant low-frequency vibrations, and to achieve a favorable acoustic performance such as a comfortable natural sound, mid-low and high-frequency range, sound quality and elongation of each instrument and vocal body, and three-dimensional sound. Is to provide an insulator for audio equipment that is significantly better than before.
Furthermore, another object of the present invention is to provide an insulator for an acoustic device that improves the acoustic characteristics of the acoustic device by improving the shielding property of vibration transmission to the mounting surface while improving the effect of suppressing the fine vibration of the acoustic device. There is.

Conventionally, the acoustic effect given by the planar shape and the cross-sectional shape of the groove formed on the bottom surface of the leg body of the insulator has not been studied.
The inventor conducted intensive research on the acoustic effect given by the planar shape and cross-sectional shape of the groove formed on the bottom surface of the leg body of the insulator. By adopting a letter shape, while avoiding the effects of variations in the ingredients and composition of materials used in insulators, it has much better acoustic performance than before, increasing the occupancy of sound quality by structure, and material As a result, it was found that an insulator for audio equipment capable of reducing the change in sound quality due to the blending error of the above can be obtained to the minimum, and the invention has been completed.

The present invention is an insulator for an audio device having a leg body as a main member, and a plurality of sound emitting grooves having a V-shaped cross section from the center side to the outer circumference side of the leg body are provided on the bottom surface of the leg body. It is formed.
In another embodiment of the present invention, the depth and width of the sound emitting groove formed on the bottom surface of the leg main body are uniform over the entire length.
In another embodiment of the present invention, one or both of the depth and width of the sound emitting groove formed on the bottom surface of the leg main body are a non-uniform combination.
In another embodiment of the present invention, the depth of the sound emitting groove formed on the bottom surface of the leg main body is different between the center side and the outer peripheral side of the leg main body.
In another embodiment of the present invention, the width of the sound emitting groove formed on the bottom surface of the leg main body is different between the center portion side and the outer peripheral portion side of the leg main body.
In another embodiment of the present invention, the planar shape of the sound emitting groove formed on the bottom surface of the leg body is substantially fan-shaped.
In another embodiment of the present invention, the number of sound emitting grooves formed on the bottom surface of the leg body is 2-8.
In another embodiment of the present invention, the width of the sound emitting groove formed on the bottom surface of the leg body is 1 to 10 mm.
In another embodiment of the present invention, a stepped hole is formed in the center of the bottom surface of the leg main body, and the leg main body is movable to the acoustic device via a sound collecting mounting screw inserted through the stepped hole. It is attached.
In another embodiment of the present invention, a plurality of vibration damping mats are attached to the bottom surface of the leg main body at a position excluding the sound emitting groove with a gap.
In another embodiment of the present invention, a sound emitting space is formed between the bottom surface of the leg body and the adjacent damping mat.
In another embodiment of the present invention, the leg body is formed of any one of a resin composition, a metal composition, a concrete composition, and a stone composition.

The insulator for audio equipment according to the present invention in which the bottom surface of the leg main body is provided with a sound emitting groove having a V-shaped cross section has a composition and composition of materials used for the insulator as compared with an insulator having a sound emitting groove having a U-shaped cross section. The change in sound quality due to variation can be reduced, and further improvement in sound quality can be realized.
The present invention has a clear sound outline, a pleasant natural reverberation, mid-low and high-range expansion, smooth sound (smoothness), and three-dimensional sound. Furthermore, it is possible to improve the acoustic characteristics of the acoustic device by efficiently suppressing fine vibrations of the acoustic device and improving the cutoff of vibration transmission to the placement surface.

Overall view of insulator for audio equipment according to Embodiment 1 of the present invention, with a part broken away Bottom view of the insulator for audio equipment according to the first embodiment attached to the bottom face of the audio equipment Sectional view of III-III in Fig. 2 Sectional view of IV-IV in Fig. 2 In explanatory drawing of Example 2, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipment. In explanatory drawing of Example 3, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipment. In explanatory drawing of Example 4, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipment. In explanatory drawing of Example 5, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipment. It is explanatory drawing of Example 6, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipment. It is explanatory drawing of Example 7, (a) is a top view of the bottom face side of a leg main body, (b) is a center longitudinal cross-sectional view of the insulator for audio equipments

  The insulator for audio equipment according to the present invention will be described in detail below with reference to FIGS.

<1> Outline of Insulator for Audio Equipment The insulator 100 for audio equipment 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 51 of the audio equipment 50.
The illustrated embodiment shown in FIGS. 1 and 2 will be described. The acoustic device insulator 100 includes a plurality of columnar leg bodies 20 and a plurality of stickers that are attached to the vicinity of the peripheral edge of the bottom surface 22 of the leg body 20 with a predetermined interval. The vibration damping mat 30 and a stepped sound collecting mounting screw 40 that movably mounts the leg main body 20 to the bottom surface 51 of the acoustic device 50 are included.
The vibration damping mat 30 and the sound collecting mounting screw 40 are not essential and may be omitted.
In the present invention, in order to improve the acoustic performance of the acoustic device 50, a plurality of sound emitting grooves 24 having a V-shaped cross section are formed radially on the bottom surface 22 of the leg body 20.

<2> Leg Body The leg body 20 is a hard 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 planar shape of the leg body 20 is preferably circular, but may be an ellipse or a polygon, and the planar shape of the leg body 20 is not particularly limited. The shape may be a flat columnar shape.

<2.1> Stepped Hole With reference to FIG. 2, the stepped hole 23 is composed of a large diameter hole 23 a formed on the bottom surface 22 side of the leg main body 20 and a small diameter hole 23 b. The sound collection mounting screw 40 is inserted from the diameter hole 23a side.

<2.2> Sound Release Groove As shown in an enlarged view in FIG. 4, the sound emission groove 24 having a V-shaped cross section formed at equal intervals on the bottom surface 22 of the leg body 20 has two inclined surfaces 24a and 24a. And a straight valley line 24b formed at the groove bottom.
One of the sound emitting grooves 24 communicates with the center stepped hole 23, and the other of the sound emitting grooves 24 is open to the outer peripheral surface of the leg body 20.
In this example, the form in which four sound emitting grooves 24 are formed at equal intervals on the bottom surface 22 of the leg main body 20 is shown, but the sound emitting grooves 24 only need to have two or more.
The sound emitting groove 24 is formed by machining the bottom surface 22 of the leg body 20.
“Machining” is not limited to cutting or press molding, but includes other known molding means such as injection molding and three-dimensional printing by a 3D printer.

<2.3> Relationship Between Depth of Sound Emission Groove and Groove Width With reference to FIG. 4, in this example, the depth H is uniform over the entire length of the sound emission groove 24, and An embodiment in which the groove width L is uniform is shown.
“Equal” means that the size of the sound emitting groove 24 facing the stepped hole 23 of the leg main body 20 is equal to the size of the sound emitting groove 24 facing the outer peripheral surface of the leg main body 20. To do.
The inclined surface 24a constituting the sound emitting groove 24 has a uniform width and a horizontally long rectangle. The planar shape of the sound emitting groove 24 also has a uniform width and a horizontally long rectangle.

In this example, a description will be given of a form in which the two elements of the depth H and the groove width L of the sound emitting groove 24 are uniformly formed. The elements may be combined non-uniformly, and the two elements may be combined non-uniformly.
Specifically, the following four combinations are possible. Any combination is common in that the cross-sectional shape of the sound emitting groove 24 is V-shaped.

a. A combination in which the depth H of the sound emitting groove 24 is uniform and the width L of the sound emitting groove 24 is uniform.
b. A combination in which the depth H of the sound emitting groove 24 is uniform and the width L of the sound emitting groove 24 is not uniform.
c. A combination in which the depth H of the sound emitting groove 24 is not uniform and the groove width L of the sound emitting groove 24 is uniform.
d. A combination in which the depth H of the sound emitting groove 24 is not uniform and the groove width L of the sound emitting groove 24 is not uniform.

  In a form in which the groove width L of the sound emitting groove 24 is not uniform, the sound emitting sound where the groove width at the center of the sound emitting groove 24 facing the stepped hole 23 of the leg body 20 faces the outer peripheral surface of the leg body 20 is provided. Two forms of the case where it is large with respect to the groove width in the outer peripheral part of the groove | channel 24 and a small case are included.

  In the form in which the depth H of the sound emitting groove 24 is not uniform, the depth of the groove at the center of the sound emitting groove 24 facing the stepped hole 23 of the leg main body 20 faces the outer peripheral surface of the leg main body 20. It includes two forms, a deep case and a shallow case with respect to the depth of the groove in the outer peripheral portion of the sound emitting groove 24.

<2.4> Depth of sound emitting groove The depth of the sound emitting groove is preferably in the range of 1 to 5 mm. A more preferable depth of the sound emitting groove 24 is 2.5 to 4.5 mm.
If the minimum depth of the sound emitting groove 24 is shallower than 1 mm, there is a problem that the sound does not spread. If the maximum depth of the sound emitting groove 24 is deeper than 5 mm, the outline of the sound decreases and the sound becomes ambiguous. There is a problem.

<2.5> Groove width of sound emitting groove The groove width of the sound emitting groove 24 is preferably in the range of 1 to 10 mm. A more preferable groove width of the sound emitting groove 24 is 2.5 to 4.5 mm.
If the minimum groove width of the sound emitting groove 24 is narrower than 1 mm, there is a problem that the sense of volume of the bass is reduced and the force is lost. If the minimum groove width of the sound emitting groove 24 is larger than 10 mm, the outline of the low sound becomes ambiguous. Or the treble is blurred.

<3> Leg Body Material As the material of the leg body 20, either a microporous structure having fine pores inside or a non-porous structure having no fine pores inside can be used. For example, resin, copper or iron Such metals, concrete compositions, natural stones and the like can be used.

<3.1> Resin-made Example When the leg body 20 is formed of a resin, the leg body 20 is a microporous structure having fine pores inside a resin composition formed of a phenolic thermosetting resin and a filler. Are preferred.
Specifically, the leg body 20 is made of a resin composition composed of a phenolic thermosetting resin and a filler, and the molded material has a specific gravity of 1.5 to 5.0, a porosity of 2 to 20%, 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, the required micro-vibration can be attenuated. No 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, molding time, etc., but the resin composition is porous as part of the filler. By adding 10 to 35% by weight of the filler based on the total amount of the resin composition, a molded product having a desired porosity and average pore diameter can be obtained without excessive examination of molding conditions.

  When a porous filler is added to the resin composition as part of the filler 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, a molding time of 2 to 15 minutes Within the range, it is possible to obtain a molded product having a desired porosity and average pore diameter.

  Examples of the porous filler include a porous filler having a microporous structure with an average pore diameter of 2 nm or less, a porous filler having a mesoporous structure with 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 other filler added is increased, and the specific gravity can be easily adjusted. Therefore, it is preferable.

  Examples of the porous filler having microporous materials include zeolite, activated carbon, porous silica, and porous alumina, and one or more of these can 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 which cut out the test piece from the leg main body and measured with the mercury porosimeter.

<3.3> Examples of Phenol Thermosetting Resins Examples of phenol thermosetting resins include straight phenol resins, resins modified with various elastomers such as cashew oil, silicone oil, acrylic rubber, phenols, and the like. 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 resins. The above can be used in combination.

<3.4> Addition Amount of Phenol Thermosetting Resin The phenol thermosetting resin is added in an amount of 5 to 25% by weight based on the total amount of the resin composition. If the addition amount of the phenolic thermosetting resin 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 in the molded product.

<3.5> Other fillers As fillers other than the porous filler, organic fibers such as aramid fibers, PAN fibers, and cellulose fibers, glass fibers, inorganic fibers such as rock wool, calcium carbonate, barium sulfate, Mica, talc, wollastonite, vermiculite, inorganic particles such as 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 , Stainless steel, steel, cast iron and other metal particles and short fibers, which can be used alone or in combination of two or more.

<3.6> Method for Manufacturing Leg Body Leg body 20 is a mixing process in which a resin composition containing a predetermined amount of a phenolic thermosetting resin and a filler is uniformly mixed in a mixer, and a thermoformed metal having a predetermined shape. It is put into a mold and manufactured through a molding step of forming a columnar shape by molding at a temperature of 130 to 170 ° C. at 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. .
Finally, a vertical stepped hole 23 is formed in the center of the leg body 20.
The manufacturing method of the leg main body 20 described above is an example, and is not limited to the above-described steps and manufacturing conditions.

<4> Damping Mats A plurality of damping mats 30 are intermittently attached to the peripheral side excluding the central portion of the bottom surface 22 and the sound emitting grooves 24.
The damping mat 30 is a vibration damping member for suppressing or suppressing transmission of micro vibrations between the acoustic device 50 and the mounting surface 60.
The damping mat 30 only needs to have an arcuate inner side surface, and the outer shape of the damping mat 30 may be other than an arc shape.

<5> Sound Collection Space and Sound Release Space The leg body 20 is placed on the placement surface 60 via the plurality of vibration damping mats 30 and a gap is formed between the bottom surface 22 of the leg body 20 and the placement surface. .
The bottom surface 22 of the leg main body 20 forms a sound collection space S ₁ surrounded by the bottom surface 22 and a plurality of vibration suppression mats 30 and opened downward, and between the adjacent vibration suppression mats 30. forming the sound space S ₁ and the slit-shaped sound emission space S ₂ in communication.
The lower openings of these spaces S ₁ and S ₂ are closed when the leg main body 20 is placed on the placement surface 60 via the plurality of damping mats 30.

<5.1> Functions of Sound Collection Space and Sound Release Space The functions of the spaces S ₁ and S ₂ will be described with reference to FIG. 2 so as to go from the center side of the bottom surface 22 of the leg body 20 toward the outer peripheral side. A plurality of sound emitting spaces S ₂ formed at the peripheral edge of the bottom surface 22 function to release part of the sound generated in the sound collecting space S ₁ to the outside of the leg body 20. The sound collection space S ₁ formed in the central portion functions in cooperation with the sound emission space S to generate a vortex flow of sound toward the center of the sound collection space S ₁ .

<5.2> Material of Damping Mat The damping mat 30 has a 30% content of wool that is pressed and hardened with natural fibers so that it has a pressure resistance (hardness) that does not compressively deform due to the weight of the acoustic device 50. It consists of the above felt.
The felt composition is preferably, for example, 60% wool and the balance is cellulose fiber, rayon, polyester or the like.

<5.3> Thickness of Damping Mat The thickness of the damping mat 30 is desirably in the range of 1 to 3 mm, and 2 mm is optimal.
If the thickness of the damping mat 30 is less than 1 mm, the damping effect of micro vibrations is extremely low, and if it exceeds 4 mm, there is a problem that the reproduced sound itself is shaved and the sound is not realistic.

<5.4> Attaching Means for Damping Mat As a means for sticking the damping mat 30 to the bottom surface 22 of the leg body 20, for example, an adhesive or a bonding method using a double-sided adhesive tape can be applied.

<5.5> Number of Damping Mats When a plurality of damping mats 30 are attached to the bottom surface 22 of the leg body 20 with the above-mentioned predetermined interval, the number of damping mats 30 installed is practically 2-8. A range of sheets is desirable.

<5.6> Arrangement interval of vibration damping mats When a circular vibration damping mat is attached to the entire bottom surface 22 of the leg body 20 or a donut-shaped vibration damping mat is attached, a certain amount of vibration is transmitted. Although the blocking effect can be expected, there is a problem that the sound of the acoustic device 50 is heard, and no special improvement effect is observed in the acoustic performance.
With the aim of improving acoustic performance, a verification test was performed by changing the interval at which the plurality of vibration damping mats 30 are arranged.
As a result, it is desirable that the appropriate interval between the adjacent damping mats 30 is in the range of 1 to 8 mm. A more preferable interval between the vibration damping mats 30 is 5 to 7 mm.

<6> Sound Collection Mounting Screw Referring to FIG. 3, the sound collection mounting screw 40 includes a shaft portion 42 that does not form a male screw over its entire length, and one end of the shaft portion 42 that is larger than the shaft portion 42. A head portion 41 having a diameter and a screw portion 43 having a smaller diameter than the shaft portion 42 at the other end of the shaft portion 42 are provided.
An annular step surface 44 is formed between the screw portion 43 and the shaft portion 42, and the stepped surface 44 abuts against the bottom surface 51 of the audio device 50, thereby restricting the screwing amount of the sound collecting mounting screw 40 to be constant. .
For the sound collection mounting screw 40, for example, a material such as stainless steel, copper, brass, or iron can be used.

<6.1> Referring to dimensional relationship diagram 3 sound collecting attachment screws and stepped bore, collected mounting screws 40 the heads of the small-diameter hole 23b of the interpolation planned length L ₁ of the shaft portion 42 It is slightly longer (about 1mm) dimensional relationship than is _{L 2.}
This is because the leg main body 20 is movably attached to the bottom surface 51 of the acoustic device 50 and functions to recirculate the sound waves in the sound collection space S ₁ toward the acoustic device 50 side.
Therefore, when the screw portion 43 of the sound collecting mounting screw 40 is screwed onto the female screw element 52 and tightened, the upper surface 21 of the leg body 20 does not completely adhere to the bottom surface 51 of the acoustic device 50, and A gap of the difference between the lengths L ₁ and L ₂ described above is formed between the main body 20 or between the head 41 of the sound collection mounting screw 40 and the leg main body 20, and is directed in the vertical direction of the leg main body 20. Allow displacement.

[Operation of insulator for audio equipment]
With reference to FIGS. 2-4, the several effect | action of the insulator 100 for acoustic devices is demonstrated.

<1> Damping Action by Leg Main Body If the bottom surface 51 of the acoustic device 50 is completely fixed with screws so that there is no play between the bottom surface 51 and the upper surface of the leg main body 20, the vibration damping effect by the leg main body 20 is greatly increased. The damping effect of micro-vibration is reduced by half.
On the other hand, when the leg main body 20 is movably attached with a play in the vertical direction via the sound collecting mounting screw 40, the leg main body 20 is subjected to slight vibration generated in the acoustic device 50 within the range of play. The fine vibration of the acoustic device 50 is transmitted to the leg body 20.
When the leg main body 20 has a microporous structure, the leg main body 20 itself exhibits a high vibration suppression function against micro-vibration, and the vibration suppression function of the leg main body 20 compared with the case where the leg main body 20 is completely fixed. Is significantly improved.

<2> Damping Action by the Damping Mat The fine vibration transmitted to the leg body 20 is damped by the damping mat 30 interposed between the lower surface of the leg body 20 and the mounting surface 60, and from the leg body 20. Transmission of fine vibration toward the mounting surface 60 is blocked.

<3> Sound Collection Action by Sound Collection Mounting Screw As shown in FIG. 3, in the sound collection space S ₁ closed by the placement surface 60, a sound vortex flows toward the center.
Since the head 41 of the sound collection mounting screw 40 is exposed at the center of the sound collection space S ₁ , the sound collection mounting screw 40 collects sound in the sound collection space S ₁ and returns to the acoustic device 50.
The acoustic performance is improved by returning a part of the minute vibration generated from the acoustic device 50 to the acoustic device 50 through the sound collecting mounting screw 40.

<4> Sound Release Action by Sound Release Groove and Sound Space As shown in FIGS. 2 and 3, the slight vibration directed toward the mounting surface 60 is generated in the sound collection space S ₁ through the bottom surface 22 of the leg body 20. ) Stays.
Some of the sound waves in the sound collection space S ₁ is that is emitted to the outside through radial sound emission space S ₂ and the sound groove 24 of V-shaped cross section, is suppressed degradation of sound be stuffy like sounds.
Particularly, in the case of forming only sound emission space S ₂ without providing the sound groove 24 on the bottom surface 22 of the leg body 20, the change in sound quality were observed by variations in the components and the composition of a material used for the leg body 20 .
On the other hand, by providing a sound emitting groove 24 having a V-shaped cross section on the bottom surface 22 of the leg main body 20, even if there are variations or errors in the composition and composition of the material used for the leg main body 20, the sound quality varies. It was confirmed by a demonstration experiment that it was not affected by
Furthermore, by providing a sound emission groove 24 having a V-shaped cross section on the bottom surface 22 of the leg main body 20, unpleasant low frequency vibration can be greatly reduced, the mid-low and high-frequency range, the extension of each instrument and vocal music body, and the sound image It was also confirmed by a demonstration experiment that preferable acoustic performance such as localization (stereoscopic sound) is remarkably superior to the conventional one.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

1. Manufacturing method of leg body The resin composition having the composition shown in Table 1 was mixed for 5 minutes with a Redige mixer, and the resulting mixture was put into a thermoforming mold. Under the conditions shown in Table 1, the diameter was about 50 mm and the thickness was about After molding into a 15 mm cylinder, the top and bottom surfaces are polished by about 0.5 mm so that the thickness is 14 mm. Finally, a stepped hole (large diameter hole: diameter 9 mm × length 7 mm, small diameter hole: diameter 4 mm × A leg body was obtained by drilling a length of 7 mm).

2. Examples 1-8
Eight types of insulators for sound equipment having a sound emitting groove in which a combination of groove depth, groove width, and groove cross-sectional shape was changed on the bottom surface of the leg body 20 were manufactured.
The first embodiment has the form shown in FIGS. 2 and 3 described above, and the depth of the sound emitting groove 24 is uniform from the inner peripheral side (center side) to the outer peripheral side of the leg main body 20, and the sound is emitted. The groove width of the groove 24 is also uniformly formed from the inner peripheral side to the outer peripheral side of the leg body 20.
Examples 2 and 3 are the forms shown in FIGS. 5A and 5B, and the depth of the sound emitting groove 24 is uniform from the inner peripheral side to the outer peripheral side of the leg body 20, while the groove width of the sound emitting groove 24 is the same. Is formed to widen (gradual increase) from the inner peripheral side to the outer peripheral side of the leg main body 20. In Example 3 of FIG. 5B, the depth of the sound emitting groove 24 is doubled compared to Example 2 of FIG. 5A.
Example 4 is the form shown in FIG. 5C, and the depth of the sound emitting groove 24 is uniform from the inner periphery side to the outer periphery side of the leg body 20, while the groove width of the sound emitting groove 24 is the leg body 20. It is formed in a narrow width (gradual decrease) from the inner peripheral side to the outer peripheral side.
In the fifth embodiment, as shown in FIG. 5D, both elements of the depth and width of the sound emitting groove 24 are formed in a non-uniform combination, and the depth of the sound emitting groove 24 is determined from the inner peripheral side of the leg body 20. The sound emitting groove 24 is formed so as to become shallower (gradually decreasing) toward the outer peripheral side, and the width of the sound emitting groove 24 is increased (gradually increasing) from the inner peripheral side to the outer peripheral side of the leg body 20.
In Example 6, as shown in FIG. 5E, both the depth and width of the sound emitting groove 24 are formed in a non-uniform combination, and the depth of the sound emitting groove 24 is determined from the inner peripheral side of the leg body 20. The sound emitting groove 24 is formed so as to be deeper (gradually increased) toward the outer peripheral side, and the groove width of the sound emitting groove 24 is increased (gradually increased) from the inner peripheral side to the outer peripheral side of the leg main body 20.
Although the illustration of Example 7 is omitted, it is the same condition as the sound emitting groove 24 of Example 3 shown in FIG. 5B (the depth of the sound emitting groove 24 is uniform over the entire length, and the groove width of the sound emitting groove 24 is the leg width). The main body 20 is widened from the inner peripheral side to the outer peripheral side), and the felt damping mat 30 is omitted.
The cross-sectional shape of each sound emitting groove 24 of Examples 1 to 7 described above is V-shaped over the entire length.
In Example 8, as shown in FIG. 5F, the sound emitting groove 25 has a U-shaped cross section, and both the sound emitting groove 25 depth and groove width are uniformly formed over the entire length. .
The planar shape of the sound emitting groove 24 shown in Examples 2 to 7 has a substantially fan shape.
Except for Example 7, in Examples 1 to 6, 8, felt damping mats 30 are attached to the bottom surface of the leg body 20.
Table 2 shows dimensional conditions and the like of the sound emitting grooves 24 and 25 according to the first to eighth embodiments.

3. Evaluation of acoustic performance Under the conditions shown in Table 2, the acoustic performance of the acoustic device insulators of Examples 1 to 8 was evaluated as follows.
In Table 2, the definition of the mounting state is as follows.

<Movable>
A shaft portion in which the sound collecting mounting screw can be inserted into the stepped hole of the leg body, a head portion formed at one end of the shaft portion, and a screw portion formed at the other end of the shaft portion smaller in diameter than the shaft portion. The axial length of the shaft portion is longer than the length of the small-diameter hole of the stepped hole, and the leg main body is movably attached to the acoustic device.

  The vibration damping mat was bonded to the leg body using a double-sided adhesive tape having substantially the same shape as the vibration damping mat.

3.1 Evaluation Method For the evaluation, an audio room designed for sound was used.
As 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. Insulators for audio devices of Examples 1 to 26 and Comparative Example 1 were attached to the power amplifier, a D / A converter that outputs an analog signal with easy-to-understand changes in sound quality, and a speaker, respectively. 1 center in the back).

  The evaluation items were (1) “Sound outline”, (2) “Comfortable natural sound”, and (2) for “Elongation of middle / low range”, “Elongation of high range” and “Roughness”. did.

The evaluation music was prepared as a comprehensive evaluation by preparing sound sources with different frequencies to be emphasized.
・ New music (voice, guitar, bass, drum: 30Hz-18kHz: center 400Hz-3kHz)
・ Jazz (piano: 30 Hz to 5 kHz: center 200 Hz to 1 kHz)
・ Classic (Orchestra: 100Hz to 4kHz: Center 300Hz to 2kHz)
・ Rock (guitar, bass, drum, keyboard: 40 Hz to 18 kHz: center 100 Hz to 1 kHz)

The evaluators selected 20 employees with different tastes, genders, and ages (22 to 62 years old) from employees, and took the average of the results. The evaluation criteria for acoustic performance are as follows.
◎: 15 to 20 people are good ○ ○: 10 to 14 people are good △: 5 to 9 people are good ×: 0 to 4 people are good

3.2 Evaluation Results As is apparent from the results in Table 2, the insulator for sound equipment of Examples 1 to 7 in which the sound emitting groove 24 has a V-shaped cross section is the same as that in Example 8 in which the sound emitting groove 25 has a U-shaped cross section. In comparison, an insulator for an acoustic device having a clear sound outline, a comfortable natural sound, and a favorable acoustic performance such as a smooth sound (coarse smoothness) was obtained.
In particular, the insulators for acoustic devices of Examples 3 and 6 were excellent in all evaluation items, and the difference in acoustic performance was remarkable as compared with Example 8 in which the sound emitting groove 25 had a U-shaped cross section.

DESCRIPTION OF SYMBOLS 100 ... Insulator 20 for acoustic devices ... Leg body 21 ... Upper surface 22 of leg body ... Bottom surface 23 of leg body ... Stepped hole 24 of leg body ... V-shaped sound emission groove 25 ... U-shaped sound emission groove 30 ... Damping mat 40 ... Sound collecting mounting screw 50 ... Acoustic device 51... Bottom surface 60 of acoustic device... Mounting surface S ₁ .. sound collection space S _2.

Claims (12)

An insulator for audio equipment having a leg body as a main member,
A plurality of sound emission grooves having a V-shaped cross section from the center side of the leg main body toward the outer peripheral side are formed on the bottom surface of the leg main body.
Insulator for audio equipment.   The insulator for acoustic equipment according to claim 1, wherein the depth and width of the sound emitting groove formed on the bottom surface of the leg main body are uniform over the entire length.   The acoustic device according to claim 1, wherein one or both of the elements of the depth and width of the sound emitting groove formed on the bottom surface of the leg body are a non-uniform combination. Insulator.   The insulator for acoustic equipment according to claim 3, wherein the depth of the sound emitting groove formed on the bottom surface of the leg main body is different between the central portion side and the outer peripheral portion side of the leg main body.   The insulator for acoustic equipment according to claim 3, wherein the width of the sound emitting groove formed on the bottom surface of the leg main body is different between the central portion side and the outer peripheral portion side of the leg main body.   The insulator for a sound device according to claim 5, wherein a planar shape of a sound emitting groove formed on a bottom surface of the leg main body has a substantially fan shape.   The insulator for acoustic equipment according to any one of claims 1 to 6, wherein the number of sound emitting grooves formed on the bottom surface of the leg main body is 2 to 8.   The insulator for acoustic equipment according to any one of claims 1 to 7, wherein a width of a sound emitting groove formed on a bottom surface of the leg main body is 1 to 10 mm.   A stepped hole is formed in the center of the bottom surface of the leg main body, and the leg main body is movably attached to an acoustic device via a sound collecting attachment screw inserted through the stepped hole. The insulator for audio equipment according to any one of claims 1 to 8.   10. The vibration control mat according to claim 1, wherein a plurality of vibration damping mats are attached to the bottom surface of the leg main body at intervals at positions excluding the sound emitting grooves. Insulator for audio equipment.   The sound equipment insulator according to claim 10, wherein a sound emitting space is formed between a bottom surface of the leg main body and an adjacent vibration damping mat.   The sound according to any one of claims 1 to 9, wherein the leg body is formed of any one of a resin composition, a metal composition, a concrete composition, and a stone composition. Insulator for equipment.

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