JPH0518799Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an audio insulator that can improve sound quality at low and high temperatures.

[Prior Art] Conventional audio insulators have used blocks made entirely of materials such as wood and metal.

[Problems to be solved by the invention] However, insulators made of these materials have the disadvantage that the nozzle easily comes out, which creates noise, and there is no function to select and clean the sound.

In view of such conventional products, the present invention has been able to provide an audio insulator that has a sound cleaning function and has excellent sound quality and acoustic characteristics at extremely low temperatures and extremely high temperatures.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. That is, (1) an audio insulator comprising a resin block comprising an epoxy resin, a polyamide resin, and an inorganic filler and having a vibration loss coefficient of 0.02 or more at 10 to 30°C.

(2) The audio insulator according to claim (1), wherein the resin block has a composite or laminated structure with metal or ceramic.

The present invention will be explained based on the drawings.

The audio insulator of the present invention is, for example, a block-like object as shown in FIG. 1, and is composed of a cylindrical block 1 made of resin made of epoxy resin, polyamide resin, and inorganic filler.

This insulator has the characteristics of emphasizing extremely low temperatures and extremely high temperatures of the sounds emitted from audio equipment, purifying noise, and enhancing acoustic effects.

Such an insulator can also be constructed of a composite or/and laminate of the resin block 1 and a metal block or ceramic block 2, as shown in FIG. That is, the resin layer may be provided on the surface thereof, or it may be a composite with another resin.

The present invention selects and changes the sound quality emitted from audio equipment by constructing the insulator with a resin block 1 made of a resin composition mainly composed of a specific resin, epoxy resin, polyamide resin, and inorganic filler. The present invention was developed by discovering that this method has the ability to improve sound quality.

This specific property of sound quality improvement effect is particularly important among the resin blocks made of the above-mentioned resin compositions.
This is achieved by having a vibration loss coefficient of 0.02 or more at 10 to 30°C.

If the coefficient is less than 0.02, the effect of the present invention will be extremely small.

This vibration loss coefficient is measured as follows.

In other words, after pasting a 10 mm thick synthetic resin onto a 5 mm thick steel plate using a two-component epoxy adhesive, the adhesive was left to harden for 24 hours, and then the adhesive was cured to meet U.S. military standards.
According to MIL-P-22581 B, measure the vibration damping waveform and find the vibration loss coefficient (η) using the following formula.

a Attenuation rate (DECAY RATE) Do (dB/sec) = (F/N) 20log (A ₁ /A ₂ ) b Effective attenuation rate (EFFECTIVE DECAY
RATE) De (dB/sec) = Do-D _B c Critical attenuation rate (PERCENT CRITICAL
DAMPING) C/C _C (%) = (183×De)/F where F: Natural frequency of the sample bonded disk N: Number of calculated periods A ₁ : Maximum amplitude in N A ₂ : N Do: Damping coefficient of the test bonded disc D _B : Damping coefficient of the original disc d Vibration loss coefficient (η) η = (C/C _C )/50 Resin block 1 that exhibits such performance is constructed. Epoxy resin exhibits fluidity at room temperature to 100℃,
Those having a viscosity of 1 to 300 poise at 25°C, an epoxy equivalent of 100 to 500, and a molecular weight of 200 to 1000 are selected from the viewpoint of good sound quality. Examples of such epoxy resins include Epicote 828,
827, 834, 807 (manufactured by Yuka Shell Epoxy KK)
GY250, 260, 255, 257 (Japan Ciba Geigy KK
(manufactured by).

The polyamide resin referred to in the present invention is selected to have a viscosity of 3 to 2000 poise at 25°C and an amine value of about 100 to 800. Examples of such amide resins include Tomide #225-X and #215-
X, #225 (manufactured by Fuji Kasei KK), Versamide 100,
125, 140, 150, 115 (manufactured by Henkel Hakusui KK),
Examples include EPON-V15 (manufactured by Ciel KK).

The amount of polyamide resin mixed with epoxy resin is usually 50 to 800 parts by weight per 100 parts by weight of epoxy resin.
Parts by weight, preferably from 100 to 600 parts by weight, are selected based on flexibility.

If the amount is less than this range, the block hardness will increase, while if it is too much, the block will become too soft and the mechanical properties will deteriorate.

In the present invention, commonly used epoxy resin curing agents such as aliphatic amines, aromatic amines, carboxylic acids, etc. may be used if necessary.

By incorporating at least one filler selected from graphite, ferrite, and mica into the resin block 1 of the present invention, the sound quality improvement effect is further improved.

Select graphite in the form of scales. Such graphite is favorable for sound quality effects. Ferrite has a specific gravity of 2.45~
2.70 range is used. The mica may be white mica or gold mica, but like graphite, scaly mica is selected for its sound quality.

The particle size of such inorganic fillers is
The particles are selected to have a particle size that will pass through a 60 mesh sieve (Tyler standard sieve).

If the size of the particles is outside the above range, the particles will become bulky, making it difficult to blend in large amounts or uniformly.
It is difficult to obtain sufficient sound quality improvement effects.

Such a filler is blended in an amount of at least 30 parts by weight, preferably 40 parts by weight or more, based on 100 parts by weight of the resin composition, and in particular, in the case of graphite or mica, it is blended in at least 40 parts by weight, and in the case of ferrite, it is blended in at least 50 parts by weight. is preferable.

The greater the amount of filler blended, the better the sound quality improvement, and at the maximum blending, graphite and mica can be blended at 300 parts by weight, and ferrite can be blended at 350 parts by weight. However, from the viewpoint of the hardness and workability of the molded product, the maximum blending amount is selected to be about 200 parts by weight in the former case and 250 parts by weight in the latter case.

Although these fillers may be used alone, a combination of graphite and ferrite or graphite and mica is particularly preferred.

Monofunctional epoxy compounds such as methyl glycidyl ether, butyl glycidyl ether, octyl glycidyl ether,
By blending dodecyl glycidyl ether, eicosyl glycidyl ether, phenyl glycidyl ether, etc., flexibility is improved,
Furthermore, the effects of the present invention can be improved with precision.

In the present invention, flame retardants such as aluminum hydroxide, magnesium hydroxide, antimony trioxide, paraffin chloride, zinc oxide, and aluminum bromide, silica sand, talc, and carbon fiber are used in the present invention to the extent that the properties of the resin block 1 are not impaired. Additives such as may also be added.

The resin block 1 of the present invention can be easily produced by injecting the resin composition into a molding machine capable of obtaining the required block shape under heating from room temperature to 100°C, and curing the resin composition.

At this time, it can also be laminated or composited with block-like materials such as wood, ceramics, and metal blocks.

The shape of the insulator in this invention is cylindrical,
As long as it is a block-like object such as a prism, triangular prism, or trapezoid (circle, square, irregular shape), there are no restrictions on its cross-sectional shape.

(Effects of the invention) The audio insulator of the invention has the effect of purifying the sound of audio equipment and emphasizing the sounds of extremely low temperatures and extremely high temperatures.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of an example of the audio insulator of the present invention, and FIG. 2 is an example of a laminated type. In the figure, 1... resin block, 2... copper block.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An audio insulator comprising a resin block comprising an epoxy resin, a polyamide resin, and an inorganic filler and having a vibration loss coefficient of 0.02 or more at 10 to 30°C. (2) The audio insulator according to claim 1, wherein the resin block has a composite or laminated structure with metal or ceramics.