JPH05307394A - Vibration proof material - Google Patents

Abstract

PURPOSE:To obtain distinct sounds free from noises in middle and high sound ranges with the vibrationproof material for suppressing the transmission of vibrations by suppressing the resonance and distortion of sounds. CONSTITUTION:This vibration proof material 1 is formed of ceramics and has a honeycomb structure. The vibration proof material 1 may be constituted by combining a ceramic honeycomb 3 and an elastic body, such as synthetic rubber and may be constituted of a rollable honeycomb, such as columnar ceramic honeycomb, and a stopper for regulating rolling with a play. The ceramic vibration proof material 1 can be formed of fine ceramics and more particularly fine ceramics of an oxide system. The ceramic vibration proof material 1 is obtd. by adding polysaccharides produced by microorganisms, etc., to raw material powder of fine ceramics, such as alumina, kneading the mixture, molding the mixture by using molds having the structure corresponding to the honeycomb structure and calcining the molding. The vibration proof material 1 prohibits the transmission of the vibrations which are the case for noise. The vibration proof material 1 is usable as the pedestals of audio equipment, the spacers between the audio equipment and a housing, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel vibration damping material applied to audio equipment, electronic parts, mechanical parts, home electric appliances, building members and the like.

[0002]

2. Description of the Related Art In a sound device such as a speaker, an amplifier or a player, its circuit board, a mechanical part such as a compressor, the generated vibration is transmitted and causes noise. Particularly in an acoustic device, vibrations resonate or an unpleasant sound is generated due to a microphonic effect, and sound clarity is impaired.

As a vibration isolator, a rubber isolator having a special cross-sectional shape, an aluminum alloy isolator, an iron alloy isolator, a crystal glass isolator, and a ceramic isolator have been proposed. , It is known that a specific sound quality can be obtained depending on the material of the anti-vibration material [Nikkei New Material (19
September 10, 1990, pp. 18-23)]. For example, when using aluminum alloy or iron alloy vibration damping material,
It has a lingering sound, and when crystal glass vibration damping material is used, it has a fast rising sound. Moreover, when a ceramic vibration-damping material is used, the sound rises quickly, is hard, and has a lingering sound.

Further, Japanese Utility Model Laid-Open No. 60-68780 proposes a speaker stand made of foam ceramics.

However, none of the conventional vibration damping materials has sufficient vibration damping performance, and the vibration propagates. Further, when applied to an audio device, the sound quality resonates and has distortion, and noise and unpleasant sound are likely to occur. In particular, the sharpness of the sound in the mid-high range is not sufficient.

In addition, in the housing complex such as condominiums, which has been increasing in number in recent years, vibration during operation of home electric appliances such as refrigerators and washing machines has become a problem as vibration pollution in the neighborhood. For this reason, various anti-vibration measures have been proposed, but no means for achieving the sufficient effect has been obtained yet.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration damping material which can efficiently damp vibrations to prevent the transmission of the vibrations and can eliminate or damp noises and unpleasant sounds. is there.

Another object of the present invention is to provide a vibration damping material for a speaker, which can produce a clear sound especially in the middle and high range.

Still another object of the present invention is to provide a vibration-damping material capable of efficiently dampening vibrations to prevent transmission of the vibrations and to obtain clear sound in a wide sound range.

[0010]

In order to achieve the above object, the present inventor has
As a result of diligent studies, when a vibration-damping material composed of a ceramic honeycomb is used for audio equipment, vibration is efficiently damped and noise and unpleasant noise are significantly reduced. By combining a rollable ceramic honeycomb and a stopper,
Furthermore, they have found that the above characteristics are improved and completed the present invention.

That is, the present invention provides a vibration isolator made of a ceramic honeycomb.

The present invention also provides a vibration damping material composed of a ceramic honeycomb and an elastic body in contact with the honeycomb.

Further, the present invention provides a vibration damping material comprising a ceramic honeycomb having a rollable curved surface and a stopper for restricting rolling of the honeycomb with play.

In the present specification, the term "fine ceramics" does not mean that a natural raw material is used as it is.
It refers to ceramics that are produced by a compacting and sintering method with a precisely controlled chemical composition and a well-controlled raw material powder. The "oxide-based fine ceramics" means fine ceramics containing 50% by weight or more of an inorganic oxide.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings as needed.

FIG. 1 is a schematic perspective view showing an example of the vibration damping material of the present invention. The vibration isolator 1 has a honeycomb structure formed of columnar ceramics and having a large number of through holes 2. That is, the vibration isolator 1 is composed of the ceramic honeycomb 3.

The vibration-damping material 1 can be formed of various ceramics, such as ceramics and porcelain, but it is preferably formed of fine ceramics, particularly oxide-based fine ceramics.

When the vibration-damping material is formed of fine ceramics, it is possible not only to control the degree of damping for the transmission of vibrations more accurately, but also to damp the vibrations that cause noise or to prevent the transmission of vibrations, as compared with ceramics and the like. .. In other words, ceramics have a higher natural frequency than other materials, and since the difference in natural frequency from other materials is large,
Does not resonate with vibrations generated by other substances. Further, in the ceramics sintered body, bubbles and the like, and a large number of crystal grain boundaries can be present by appropriately selecting the sintering conditions. Therefore, the ceramic vibration-damping material can efficiently damp the vibration that causes noise, and the transmission of the vibration is blocked. Also, when used as a vibration isolator for audio products,
High-quality sound with no noise or distortion can be obtained with good reproducibility. In particular, when the vibration damping material is formed of oxide-based fine ceramics, resonance can be significantly suppressed, vibration damping efficiency can be increased, and vibration transmission can be efficiently blocked.

Examples of raw materials for fine ceramics include alumina, zirconia, titania, magnesia, yttria, calcia, spinel, synthetic silica, synthetic cordierite, artificial clay, synthetic zeolite, ferrite,
Oxide fine ceramic raw material powder such as barium titanate and strontium titanate; Carbide fine ceramic raw material powder such as silicon carbide, boron carbide and tungsten carbide; Nitriding of silicon nitride, aluminum nitride, boron nitride, titanium nitride, etc. Fine ceramic raw material powders; boride fine ceramic raw powders such as titanium boride and zirconium boride; synthetic kaolinite, calcium phosphate, hydroxyapatite and the like. These ceramic raw materials can be used alone or in admixture of two or more. It is preferable that these fine ceramic raw materials contain oxide-based fine ceramic raw material powder, for example, alumina as a main component.

When the vibration damping material is manufactured by using two or more kinds of the ceramic raw materials, the natural vibration is dispersed more than when a single ceramic raw material is used. Therefore, when applied to acoustic products, sound resonance and distortion are further suppressed, and clearer sounds can be obtained, and when applied to mechanical parts,
Generation of noise and vibration is further suppressed.

The ceramic may be porous such as zeolite. When the vibration damping material is made of porous ceramics, the natural vibration can be further dispersed. The ceramic may be a porous body obtained by sintering a mixture of a plurality of types including zeolite and the like.

When two or more kinds of ceramic raw materials are used, their proportions can be appropriately selected within a range that does not impair the vibration-proof characteristics. When the oxide-based fine ceramics raw material powder is used in combination with another fine ceramics raw material powder, the amount of the oxide-based fine ceramics raw material powder is, for example, 50 to 99.5% by weight, preferably 70% of the total amount.
It is about 99% by weight. When alumina is the main component, the other components are, for example, 0.5 to 70% by weight, preferably 1 to 50% by weight of the total amount. Further, when using two or more kinds of oxide-based fine ceramics raw material powder, it is preferable to use, for example, 25% by weight or more, and preferably 50% by weight or more of the total amount of alumina.

The particle size of the ceramic raw material powder is not particularly limited, and for example, a powder having an average particle size of 50 μm or less, preferably 10 μm or less, and more preferably 1 μm or less can be used.

The vibration damping material of the present invention has a honeycomb structure.
The cross-sectional shape of the holes 2 of the honeycomb is not particularly limited.
Polygons such as triangles, squares, pentagons, and hexagons, circles,
It may be an ellipse, a rectangle with rounded corners, or the like. The pore size can be appropriately selected and is, for example, about 0.1 to 10 mm.
The number of cells can be appropriately selected within a range in which vibration transmission can be suppressed, but for example, it is 10 or more per 1 square inch, preferably 25 to 1500, and more preferably 50 to 1.
It is about 000. The aperture ratio of the honeycomb is not particularly limited as long as the strength as the vibration damping material is maintained, but it is 30 to 80.
% Is preferable.

Further, the shape of the vibration-proof material is not limited to the cylindrical shape shown in the figure, and for example, a cubic shape, a rectangular parallelepiped shape, a polygonal column shape,
It may be disk-shaped or the like. The thickness and size of the anti-vibration material is
It can be appropriately determined according to the application etc. For example, when it is used as a pedestal or the like, it can be appropriately selected within a range that does not hinder mounting stability.

Since such a vibration isolator has a honeycomb structure in addition to being composed of the ceramics having the above-mentioned excellent properties, it has an extremely high vibration isolation property.
That is, compared to the conventional ceramics vibration damping material, the vibration causing the noise can be damped very efficiently, and the transmission of the vibration can be prevented. Therefore, when applied to acoustic products, vibrations that resonate a metal or plastic housing are reliably blocked by the ceramic vibration damping material, resonance and distortion of sound are suppressed, and excellent sound quality without noise and unpleasant sound is achieved. Become. In particular, a clear sound can be obtained in the mid-high range. Further, when the circuit board inside the audio equipment is incorporated via the ceramic vibration damping material, even if the housing vibrates, the vibration is not transmitted to the board, the microphonic effect is suppressed, and the generation of noise is suppressed. further,
When applied to mechanical parts, the generation of noise can be significantly suppressed. It is especially effective when used as an audio amplifier or turntable base.

Further, since it has a honeycomb structure, it has a higher mechanical strength than conventional foamed ceramics.

The ceramic vibration-damping material of the present invention may be composed of only a ceramic honeycomb, but other materials such as wood, paper, etc. may be used as long as the vibration-damping characteristics are not impaired.
It may be configured by combining with cloth, fiber, metal, alloy, glass, rubber, plastic and the like.

FIG. 2 is a schematic perspective view showing another example of the vibration damping material of the present invention.

The vibration damping material 11 is made of prismatic ceramics and has a ceramic honeycomb 13 having a large number of through holes 12 formed therein, and an elastic synthetic rubber sheet 14 bonded to the side surface of the ceramic honeycomb 13. It is composed of.

Since the vibration-damping material 11 is formed by combining the ceramic honeycomb 13 and the synthetic rubber sheet 14, the vibration can be damped more efficiently and the transmission of the vibration can be prevented in a wide vibration range. It should be noted that although the elastic body such as synthetic rubber alone does not significantly improve the vibration damping property, when the composite body is combined with the ceramic honeycomb, the vibration damping property, particularly in the middle frequency region to the low frequency region, is significantly improved. It Therefore, when applied to acoustic products such as speakers, it is possible to obtain clear sound.

Elastic materials include natural and synthetic rubbers. Examples of the synthetic rubber include isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile butadiene rubber, butyl rubber, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-butadiene-acrylonitrile copolymer, ethylene propylene rubber, polyurethane. Examples thereof include rubber, silicone rubber, fluororubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, polysulfide rubber, propylene oxide rubber, ethylene acrylic rubber, polynorbornene rubber, and recycled rubber.

These elastic bodies include additives such as fillers such as carbon black and calcium carbonate, antioxidants, antiaging agents such as ultraviolet absorbers, colorants, dispersants, processing aids and reinforcing agents. It may be large or vulcanized. Further, these elastic bodies may be foamed.

The thickness of the elastic body can be appropriately selected according to the application, but the thickness of the entire elastic body interposed between the vibration source and the member to be transmitted is, for example, 0.1 to 25 mm, preferably 0.2. It is about 10 to 10 mm, more preferably about 0.5 to 5 mm. It should be noted that as the thickness of the elastic body increases, the vibration damping characteristics tend to deteriorate, and the vibration damping characteristics of the ceramic honeycomb tend to deteriorate. Therefore, in order to damp the vibration that causes noise in the audio equipment and suppress the resonance and distortion of the sound, 0.1 to 15 mm, preferably 0.2 to 12 mm.
It is preferable to use an elastic body having a thickness of about mm. When the thickness of the elastic body exceeds 15 mm, the characteristics of the elastic body are developed and the vibration damping characteristics are likely to deteriorate.

It is sufficient that the vibration-damping material has the ceramic honeycomb and an elastic body in contact with the ceramic honeycomb, and it may be a composite body in which a synthetic rubber sheet is integrated with the ceramic honeycomb by bonding. It may be used in combination with a ceramic honeycomb.

The elastic body is provided between the vibration source and the member to be transmitted,
As long as the ceramic honeycomb and the elastic body are interposed, the ceramic honeycomb can be formed or arranged in an appropriate place. For example, the composite may be integrally formed on at least a part of the side surface or the outer peripheral surface of the ceramic honeycomb or the opening end surface of the hole 12 shown in FIG. Further, the ceramic honeycomb and the elastic body may be arranged between the vibration source and the member to be transmitted. The vibration-proof material is preferably arranged such that the elastic body makes surface contact with the vibration source and / or the transmitted member.

3 to 5 are schematic perspective views showing still another example of the vibration-proof material of the present invention.

The vibration damping material 21 shown in FIG. 3 has a plurality of through holes 2.
2 is formed of a cylindrical ceramic honeycomb 23, and rubber sheets 24a and 24b provided on both end surfaces of the opening of the hole 22 in the ceramic honeycomb 23.

The vibration damping material 31 shown in FIG. 4 has a plurality of through holes 3
Rubber sheets 34a and 34b are provided on both end faces of the opening of the hole 32 in the prismatic ceramic honeycomb 33 in which the 2 is formed.

Further, the vibration damping material 41 shown in FIG. 5 is a prismatic ceramic honeycomb 4 having a plurality of through holes 42 formed therein.
3 and rubber sheets 44a and 44b provided on opposite sides of the ceramic honeycomb 43.

The composite body can be obtained by joining the ceramic honeycomb and the elastic body by a joining means such as an adhesive, or by coating the ceramic honeycomb with the elastic body by coating or fusion.

When the vibration damping material of the present invention is used, the direction of the holes of the vibration damping material forming the honeycomb structure is not particularly limited, and it may be vertical or horizontal.

FIG. 6 is a schematic sectional view showing a usage state of another vibration-proof material of the present invention.

In this example, a plurality of vibration isolation members 51 are provided between a vibration source 55 such as an audio device such as a speaker box, a refrigerator or an electric washing machine, and a mounting table 56 as a vibration transmitting member.
Are arranged. Each vibration isolator 51 has a plurality of holes 5 in the axial direction.
2 is formed and has a cylindrical ceramic honeycomb 53 having a rollable curved surface, and a pair of rod-shaped stoppers 54 that regulate the rolling of each honeycomb with a slight amount of play. Further, the ceramic honeycombs 53 are arranged in a direction substantially orthogonal to the vibration direction of the vibration source 55, and the stoppers 54 are provided on the mounting table 56 adjacent to both side portions of the ceramic honeycombs 53 at a slight interval. ing.

FIG. 7 is a schematic sectional view showing a use state of still another vibration isolator of the present invention, and FIG. 8 is a schematic perspective view of a main part of the vibration isolator of FIG.

In this example, the vibration-proof material 61 interposed between the vibration source 65 and the mounting table 66 has a plurality of holes 6 in the same manner as described above.
2 has a cylindrical ceramic honeycomb 63, and a stopper 64 having a curved concave surface having a larger radius of curvature than the curved surface of the ceramic honeycomb 63 on the inner side wall for accommodating and supporting a part of the ceramic honeycomb with play. It is configured. That is, there is a play (margin) between the deepest portion of the inner surface of the stopper 64 and both side portions so that the ceramic honeycomb 63 slightly rolls. Therefore, the ceramic honeycomb 63 can roll along the curved concave surface of the stopper 64, and excessive rolling of the honeycomb 63 is restricted by the curved side portions of the stopper 64.

With such vibration damping materials 51 and 61, transmission of vibrations by the vibration sources 55 and 65 can be efficiently blocked by the ceramic honeycombs 53 and 63, and vibrations from the vibration sources 55 and 65 can be effectively prevented. , 63 can also be alleviated. That is, the vibration sources 55, 6
Since the ceramic honeycombs 53 and 63 arranged in a direction substantially orthogonal to the vibration direction of 5 are arranged so as to be rollable with the stoppers 54 and 64 in play, vibrations can be damped more efficiently and, as a vibration-transmitted material, Mounting table 56,
The transmission of vibration to 66 can be prevented. Further, the excessive rolling of the ceramic honeycombs 53 and 63 causes the stopper 5 to move.
The vibration sources 55 and 65 can be stably supported by the ceramic honeycombs 53 and 63 because they are regulated by the sensors 4 and 64. This aspect is particularly suitable as a speaker base.

In the vibration damping material shown in FIGS. 6 to 8,
In the ceramic honeycomb, the surface in contact with the vibration source and the vibration transmitting member may be formed into a rollable curved surface,
For example, it may have an elliptical cross section. The ceramic honeycomb does not need to have a curved surface that can roll over the entire surface. For example, ceramics in which bulging portions having curved surfaces are formed at intervals on the outer peripheral surface of a rod-shaped ceramic honeycomb, etc. As described above, it may have a curved surface that can be partially rolled.

Further, the direction in which the ceramic honeycomb is arranged with respect to the vibration direction of the vibration source is not particularly limited, but if the rollable ceramic honeycomb is arranged in the direction substantially orthogonal to the vibration direction as described above, the vibration can be efficiently generated. It can be well damped and can prevent the transmission of vibration.

The ceramic honeycomb is not limited to a cylindrical shape, but may be a spherical shape, a narrow ring shape, or the like. Also,
The ceramic honeycomb that constitutes the vibration damping material has a ring shape,
It may be provided with an element having a rollable curved surface formed of a plurality of cylindrical or spherical ceramic honeycombs and a connecting member for integrally connecting these elements, preferably rotatably. In this case, the ceramic honeycomb may have a polygonal shape such as a triangle or a quadrangle, a frame shape such as a ring, in which the plurality of elements are arranged in a beaded shape or rotatably at an appropriate position such as a corner portion. When the frame-shaped ceramic honeycomb is used, the element can be rolled with respect to vibrations in all directions, so that the arrangement direction of the ceramic honeycomb is not limited. The connecting member may have flexibility or may be foldable.

Further, the stopper only needs to be capable of restricting excessive rolling of the ceramic honeycomb with play. For example, instead of the stopper having a rectangular cross section shown in FIG.
A stopper having a triangular cross section or a wedge-shaped stopper having a curved surface having a larger radius of curvature than the curved surface of the ceramic honeycomb may be used. Further, the stopper as shown in FIGS. 7 and 8 may be a stopper having a curved surface whose radius of curvature is gradually larger than the curved surface of the honeycomb from the contact portion with the ceramic honeycomb.

Excessive rolling of the ceramic honeycomb is 1
It may be regulated by one stopper, or may be regulated by a plurality of stoppers arranged at intervals. Also, the stopper is
It may have a frame shape or the like corresponding to the arrangement position of the ceramic honeycomb or the element.

Further, the stopper may be arranged between at least one of the vibration source and the ceramic honeycomb and between the vibration transmitting member and the ceramic honeycomb. The stopper is made of elastic material, plastic,
It can be formed of various materials such as ceramics, metal, and wood.

The vibration-proof material of the present invention may be coated with a paint or the like, and may be further coated with a cushioning material such as foamed plastic.

The anti-vibration material of the present invention can be used in various applications where it is necessary to prevent the transmission of vibration from a vibration source. Such vibration-proof materials include, for example, pedestals of various audio devices such as analog players, compact disc players, amplifiers, tuners, cassette tape recorders, cassette tape recorders with radios, speakers; between audio devices or between audio devices. Spacer to be inserted between stand and audio rack; analog player cartridge, that is, a base for attaching parts to which needles are attached to the head shell; Insert between parts such as circuit board inside audio equipment and parts Spacers; Mechanical parts that make up a part of various machines with active parts such as compressors; Electric appliances such as refrigerators and washing machines; Anti-vibration materials for home appliances; Precision equipment parts such as support members for precision equipment; Noise In order to prevent, It is included, such as building member which is arranged in such connection part. This vibration damping material is particularly preferably used as a pedestal and a spacer for acoustic products.

In particular, the vibration damping material of the present invention is used in combination with a ceramic speaker box invented by the present inventor and applied for a patent (Japanese Patent Application No. 3-352135) dated December 12, 1991. Then, even with a small speaker box, noise and unpleasant sound can be further erased, and resonance and distortion of sound are significantly suppressed, resulting in excellent sound quality. In addition, if a vibration damping material made of ceramic honeycomb is combined with the speaker box, a clearer sound can be obtained in the mid-high range. Furthermore, when a vibration-proof material composed of a ceramic honeycomb and an elastic body is combined with the speaker box, a clear sound can be obtained in a wide sound range from a low sound range to a high sound range.

The ceramic vibration damping material of the present invention is, for example,
It can be obtained by molding a fine ceramic raw material into a honeycomb structure and sintering. As the molding method, for example, the following molding method can be used.

(A) Injection molding method A thermoplastic organic substance is added to the raw material powder of fine ceramics in an amount of about 10 to 30% by weight, and the mixture is heated and kneaded to prepare a non-aqueous kneaded clay composition, which is the same as ordinary injection molding. Then, it is a method of injecting and molding into a mold. Examples of the organic substance include polyethylene, polypropylene, polystyrene,
Examples thereof include binders of thermoplastic resins such as cellulose acetate, acrylic resins, ethylene-vinyl acetate copolymers, plasticizers such as phthalates, and lubricants such as stearic acid.

The kneaded clay obtained by the method (b) below may be used as the kneaded clay composition in the injection molding method.

(B) Extrusion molding method An organic binder of a microorganism-produced polysaccharide or a methylcellulose-based binder is added as a plasticizer to a raw material powder of fine ceramics, and a two-stage kneading method using a Dalton mixer and a vacuum kneader is used. Knead to prepare a dough. This is a method of forming the dough by an extruder equipped with a die corresponding to the honeycomb structure. According to this method, plasticity is imparted to the raw material powder with a small amount of binder,
Moldability, dimensional accuracy, and production efficiency are higher than those of the other methods. Further, according to this method, a molded body having a honeycomb structure can be manufactured continuously and efficiently.

Examples of the microbial-produced polysaccharides include dextran, duran gum, xanthan gum, pullulan,
Examples include paramylon, curdlan, and sclenoglucan. Among these, glucan-based polysaccharides, especially β-1, such as paramylon, curdlan, and sclenoglucan,
Β-1,3-glucan having a 3-glycoside is preferable from the viewpoint of water retention and plasticity.

Organic binders of polysaccharides produced by microorganisms, methylcellulose-based organic binders include other components such as cellulose-based compounds such as methylcellulose and ethylcellulose, polyhydric hydroxy compounds such as glycerin and polyethyleneglycol, polyvinyl alcohol and polyvinylpyrrolidone. You may use it, mixing with a polymer etc. Particularly, it is preferable to mix the β-1,3-glucan with a cellulosic compound and polyoxyalkylene glycol. The addition amount of the other components to be mixed is, for example, 50% by weight or less of the total amount of the binder.

The amount of such plasticizer added is 0.1 to 15% by weight, preferably 1 to 10% by weight, based on the ceramic raw material powder.

The molded body obtained by the above methods (a) and (b) is usually dried, and then, for example, at a temperature according to the kind of the ceramic raw material powder, for example, 800 to 2
A vibration damping material made of a ceramic honeycomb can be manufactured by sintering at about 000 ° C. In addition, you may process a molded object or a sintered ceramics as needed.

[0065]

Since the vibration-proof material of the present invention is made of a ceramic honeycomb, it can efficiently damp vibrations and prevent the transmission of vibrations, thereby eliminating noise and unpleasant sounds.

When applied to an acoustic product, resonance and distortion of sound are suppressed, and clear sound can be obtained in the middle and high range.

By using the vibration damping material in which the ceramic honeycomb and the elastic body are combined, the vibration can be damped more efficiently and the transmission of the vibration can be prevented. In particular, vibrations in a wide range of low frequency to high frequency can be efficiently damped. Therefore, when this is applied to an acoustic product, a clear sound can be obtained in a wide range.

Further, in the vibration-proof material in which the ceramic honeycomb having the rollable curved surface and the stopper are combined, the vibration can be efficiently damped even by the rolling of the ceramic honeycomb. Therefore, the transmission of vibration can be blocked more efficiently.

[0069]

EXAMPLES The present invention will be described in more detail based on the following examples.

Example 1 Sinterable low-soda alumina [AE manufactured by Sumitomo Chemical Co., Ltd.]
S-11 (purity 99.5%, BET specific surface area 6 to 7 m ²
/ G, average particle size 0.4 to 0.5 μm] 2 parts by weight of curdlan is mixed with 100 parts by weight, 25 parts by weight of distilled water is added, and the mixture is kneaded by a biaxial kneader to prepare a kneaded clay. did.
Next, the kneaded material was continuously extruded and molded using a cylindrical mold (cell number: 130) having a structure corresponding to the honeycomb structure shown in FIG.

Then, a columnar molded body having a large number of cells formed in the axial direction is dried at 40 to 120 ° C., cut into a predetermined height, and heated in an electric furnace at a temperature rising rate of 3 ° C./min. 800 ° C
After heating to 800 ° C. for 3 hours, the temperature was raised to 1550 ° C. at a heating rate of 2 ° C./min, held at 1550 ° C. for 3 hours, and allowed to cool in the furnace for 9 hours. The obtained ceramic vibration damping material had a diameter of 25 mmφ, a height of 20 mm, a hole diameter of 1 mm × 1 mm, and 130 cells.

Reference Example The kneaded material used in Example 1 was placed at the center of the concave female molding surface of the porous female mold, and the female mold and the male mold were pressure-molded by the porous male mold while vacuum suction was performed. Compressed air was supplied from the mold to the molding surface to release the molded body. Next, in the same manner as in the example, the molded body was dried and then sintered to make a ceramic box [internal volume of about 500 cc (width of about 8.5 cm x height of about 8.5 cm x depth of about 7.0 cm), outside. Standard size 72
7 cc (8.7 cm × 8.7 cm × 9.6 cm)] was produced.

Cone type full range (8Ω) with a diameter of 8 cmφ
Of the speaker (manufactured by Fostex Craft Co., Ltd., trade name FE83) was attached to the peripheral edge of the baffle board, and the end face on the opening side of the ceramic box was joined to produce a speaker box. The obtained speaker box was placed on the ceramic vibration damping material obtained in Example 1.

Comparative Example 1 A ceramic vibration-damping material having no honeycomb structure was prepared in the same manner as in Example 1 except that a molded body having no cells was produced using the kneaded clay and the ring-shaped molded body used in Example 1. Was produced.

On the vibration damping material obtained in Comparative Example 1, a diameter of 8 cm
φ cone type full-range (8Ω) speaker [Co., Ltd.
A wooden speaker box having an internal volume of 500 cc and equipped with Fostex Craft, trade name FE83) was placed.

The sound quality of the speaker and the clarity of the sound were evaluated by the five panelists according to the following criteria. The results are shown in Table 1.

Presence / absence of noise in low to high range Good: No noise and unpleasant sound Good: Some noise and unpleasant sound Poor: Many noise and unpleasant sound Sharpness in middle and high range Good: Clear Good: Some lack of sharpness No: unclear

[0078]

[Table 1] From Table 1, in Example 1, compared to Comparative Example 1, resonance and distortion of sound are suppressed, there is no noise and unpleasant sound, and the sound is clear especially in the mid-high range.

The following Examples 2-12 and Comparative Examples 2-6
In, the anti-vibration property was measured as follows. That is, as shown in FIG. 9, the speaker (16 cmφ
The speaker 103 is a voice coil 102 of a modified example of the above), and a diaphragm 103 made of a brass plate having a thickness of 0.1 mm is arranged on the diaphragm 103, and a sample 104 is placed on the diaphragm 103. Further, the impact sensor 105 [Model PKS1-41 manufactured by Murata Manufacturing Co., Ltd.] was placed on the sample 104. Note that reference numeral 1
06 is a magnet that constitutes the speaker 101,
Reference numeral 107 is a frame.

Then, the optical disc is mounted on the optical disc device, a signal corresponding to a predetermined frequency recorded on the optical disc is amplified by an amplifier, and the amplified signal is given to the speaker 101, whereby the sample 104 is vibrated.
The vibration of the sample 104 was detected by the impact sensor 105. The voltage detected by the impact sensor 105 was measured with a digital voltmeter (unit: mV).

The vibration by the impact sensor 105 when the sample 104 was not arranged was defined as the reference vibration (mV). Further, in Examples 7 to 12, the vibration plate 103 and the sample 1 were used.
04, and between the sample 104 and the impact sensor 105, the synthetic rubber sheet 108 was arranged and the vibration-proof characteristic was measured.

Example 2 The ceramic honeycomb obtained in Example 1 was placed on the vibrating plate in the vertical direction, that is, the through holes of the honeycomb were parallel to the vibration transmitting direction.

Example 3 Using a zeolite in place of alumina and a prismatic mold in place of the cylindrical mold, a prismatic ceramic honeycomb (length 29 mm × width 29 mm ×) was prepared in the same manner as in Example 1. Height 36 mm, hole diameter 1.3 mm x 1.3 m
m, the number of cells was 300 / inch ² ). The obtained ceramic honeycomb was arranged in the vertical direction on the vibration plate, and the vibration damping property was measured.

Example 4 The ceramic honeycomb obtained in Example 3 was arranged on the vibrating plate in the lateral direction, that is, the through holes of the honeycomb were orthogonal to the vibration transmitting direction.

Example 5 Zeolite was used instead of alumina, and a prismatic mold was used instead of a cylindrical mold. By the same method as in Example 1, a prismatic ceramic honeycomb (30 mm in length × 30 mm in width × 30 mm in width) was used. Height 35 mm, hole diameter 0.8 mm x 0.8 m
m, the number of cells was 625 / inch ² ). The obtained ceramic honeycomb was arranged in the vertical direction on the vibration plate, and the vibration damping property was measured.

Example 6 The ceramic honeycomb obtained in Example 5 was arranged laterally on a vibration plate.

Example 7 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibration plate.
(× 25 mm in width) was placed, and the ceramic honeycomb obtained in Example 1 was vertically arranged on the synthetic rubber sheet.

Example 8 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibration plate.
X 25 mm in width), the ceramic honeycomb obtained in Example 1 is vertically arranged on this synthetic rubber sheet, and a synthetic rubber sheet having a thickness of 1 mm (25 mm in length) is placed between the honeycomb and the impact sensor. 25 mm in width) was interposed.

Example 9 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibrating plate.
(× 25 mm in width) was placed, and the ceramic honeycomb having a small pore size obtained in Example 5 was arranged in the horizontal direction on the synthetic rubber sheet.

Example 10 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibration plate.
(× 25 mm in width), the ceramic honeycomb having a small pore size obtained in Example 5 is laterally arranged on this synthetic rubber sheet, and a synthetic rubber sheet (1 mm in thickness) between the honeycomb and the impact sensor ( 25 mm long x 25 m wide
m) was interposed.

Example 11 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibration plate.
(× 25 mm in width) was placed, and the ceramic honeycomb having a small pore size obtained in Example 5 was vertically arranged on the synthetic rubber sheet.

Example 12 A synthetic rubber sheet having a thickness of 1 mm (length: 25 mm) was placed on a vibration plate.
X 25 mm) and the ceramic honeycomb having a small pore size obtained in Example 5 is vertically arranged on the synthetic rubber sheet, and a synthetic rubber sheet having a thickness of 1 mm is provided between the honeycomb and the impact sensor. 25 mm long x 25 m wide
m) was interposed.

Comparative Example 2 The thickness of 1 used in Example 7 between the vibration plate and the impact sensor.
A synthetic rubber sheet of 25 mm (length 25 mm × width 25 mm) was interposed.

Comparative Example 3 A synthetic rubber sheet having a thickness of 2 mm (length 25 mm × width 25 mm) was interposed between the vibration plate and the impact sensor.

Comparative Example 4 An anti-vibration rubber [manufactured by Audio-Technica Co., Ltd., trade name Honeyite AV insulator, between the diaphragm and the impact sensor,
36 mmφ × height 9.5 mm].

Comparative Example 5 An impact-absorbing rubber [trade name: sorbosein, polyurethane-based rubber, 28 mmφ × height 3 mm, manufactured by Tokyo Insulation Co., Ltd.] was interposed between the diaphragm and the impact sensor.

Comparative Example 6 A non-repulsive rubber (trade name: Hanenon, length 25 mm × width 25 mm × height 3 mm) was interposed between the vibration plate and the impact sensor.

The results of Examples 2 to 6 are shown in Table 2 and FIG.
0 and the results of Examples 7 to 12 are shown in Table 3 and FIG. The results of Comparative Examples 2 to 6 are shown in Table 4 and FIG. In addition, in FIG. 10 to FIG. 12, the reference numerals indicate the numbers of Examples and Comparative Examples.

[0099]

[Table 2]

[0100]

[Table 3]

[0101]

[Table 4] Table 5 shows the outline of the results of Examples 2, 5, 8, 9 and Comparative Examples 2, 3.

[0102]

[Table 5] From Tables 2 to 5 and FIGS. 10 to 12, the vibration isolation materials (Examples 2 to 6) made of the semi-mixed honeycomb are Comparative Examples 2 to 6.
It absorbs and damps vibration more efficiently than the vibration damping material used in. In addition, the vibration damping material (Examples 7 to 12) in which the ceramic honeycomb and the synthetic rubber are combined absorbs and attenuates the vibration, particularly the vibration in the high frequency range, more efficiently.

Examples 13 and 14 and Comparative Examples 7 and 8 In the following Examples 13 and 14 and Comparative Examples 7 and 8, the vibration damping characteristics were measured as follows. That is, as shown in FIG. 13, a plate 1 having a central opening on the front surface of a speaker (10 cmφ speaker) 111.
12 and the plate 113 were arranged and placed on the mounting table 114. A pulse having a frequency of 1 Hz from an oscillator 115 was amplified by an amplifier 116 and applied to the speaker 111.

Also, the plate 113 and the mounting table 114
The three samples 117 are interposed between and, and the vibration of the pulse wave attenuated by the sample 117 is detected by the impact sensor 118 attached to the back surface of the speaker 111, and the vibration waveform is displayed on the oscilloscope 119.

In Example 13, a prismatic ceramic honeycomb made of alumina (length 29 mm × width 29) was used.
mm × height 36 mm, hole diameter 1.3 mm × 1.3 mm, cell number 300 / inch ² ) were arranged in the vertical direction, and the vibration isolation characteristics were measured. In Example 14, the prismatic ceramic honeycombs were arranged in the vertical direction, and a synthetic rubber sheet (25 mm in length × 25 mm in width) having a thickness of 1 mm was placed between the ceramic honeycombs and the plate 113 to improve the vibration damping property. It was measured.

In Comparative Example 7, as a sample, a porous sintered molded metal plate (trade name: RAS manufactured by Nippon Rusk Co., Ltd.) is used.
K; thickness 10 mm) was used. In Comparative Example 8, the vibration-damping property was measured by bringing the apex of an aluminum conical vibration-damping material (trade name: TEPTOW, sold by Stacks Co., Ltd., diameter 50 mmφ, height 30 mm) into contact with the plate 113.

The vibration by the impact sensor 118 when the sample 117 is not arranged is used as the reference vibration and is shown in FIG. The results of Example 13 are shown in FIG. 15, the results of Example 14 are shown in FIG. 16, and the results of Comparative Example 7 are shown in FIG.
18 shows the results of Comparative Example 8.

As is clear from the comparison with FIG. 14 showing the reference vibration, the vibration damping material made of the ceramic honeycomb (Example 13) and the vibration damping material combining the ceramic honeycomb and the synthetic rubber sheet (Example 14) were used. The vibration can be damped more quickly than in Comparative Example 7 using the non-repulsive rubber. Further, with the aluminum conical vibration isolator (Comparative Example 8), vibration continued for a long time.

In the thirteenth embodiment, the ceramic honeycombs are arranged in the lateral direction, and in the fourteenth embodiment, the synthetic rubber sheet is attached to the ceramic honeycombs and the mounting table 114.
The vibration waveform was substantially the same as in Examples 13 and 14 even if it was interposed between

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an example of a vibration damping material of the present invention.

FIG. 2 is a schematic perspective view showing another example of the vibration damping material of the present invention.

FIG. 3 is a schematic perspective view showing still another example of the vibration damping material of the present invention.

FIG. 4 is a schematic perspective view showing another example of the vibration damping material of the present invention.

FIG. 5 is a schematic perspective view showing still another example of the vibration damping material of the present invention.

FIG. 6 is a schematic cross-sectional view showing a usage state of another vibration damping material of the present invention.

FIG. 7 is a schematic cross-sectional view showing a usage state of still another vibration damping material of the present invention.

8 is a schematic perspective view of a main part of the vibration isolator of FIG. 7.

FIG. 9 is a schematic view showing an apparatus for measuring vibration damping characteristics in Examples 2 to 12 and Comparative Examples 2 to 6.

FIG. 10 is a graph showing the results of Examples 2 to 6.

FIG. 11 is a graph showing the results of Examples 7-12.

FIG. 12 is a graph showing the results of Comparative Examples 2-6.

FIG. 13 shows Examples 13 and 14 and Comparative Example 7,
FIG. 8 is a schematic view showing an apparatus for measuring vibration damping characteristics in No. 8.

FIG. 14 is a graph of Examples 13 and 14 and Comparative Example 7,
9 is a vibration waveform diagram showing reference vibration in FIG.

FIG. 15 is a vibration waveform chart showing the results of Example 13.

FIG. 16 is a vibration waveform chart showing the results of Example 14.

17 is a vibration waveform chart showing the results of Comparative Example 7. FIG.

FIG. 18 is a vibration waveform diagram showing the results of Comparative Example 8.

[Explanation of symbols]

1, 11, 21, 31, 41, 51, 61 ... Antivibration material 2, 12, 22, 32, 42, 52, 62 ... Holes 3, 13, 23, 33, 43, 53, 63 ... Ceramic honeycomb 14, 24a, 24b, 34a, 34b, 44a, 44
b ... Synthetic rubber sheet 54, 64 ... Stopper

Claims (2)

[Claims] 1. A vibration isolator comprising a ceramic honeycomb. 2. A vibration-proof material comprising a ceramic honeycomb and an elastic body that is in contact with the honeycomb.