JPH08163468A - Television receiver - Google Patents

Abstract

PURPOSE: To allow a television receiver to be adjusted to have a desired acoustic characteristic and to prevent production of noise by absorbing a sound wave of a desired by absorbing a sound wave with a desired number of vibration depending on a kind or a sound volume of a viewed program or the like so as to change a sound absorption characteristic. CONSTITUTION: In the television receiver where a cathode ray tube is received in a cabinet and a couple of tweeters and a couple of squaker and woofer are arranged to left and right sides of the cathode ray tube between the cabinet and the cathode ray tube, a hollow panel 11 provided with a couple of electrode plates 12, 13 on the front side and the rear side is provided, an electric sensing sound wave absorption control fluid constituent 15 including solid particles 21 having an electric field arrangement effect received in a couple of the electrode plates 12, 13 into an electric insulation medium 22 and a sound wave absorption controller 10 comprising a variable power supply 16 applying a desired voltage between a couple of the electrode plates 12,13 are arranged in the cabinet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a sound wave absorbing device provided with a fluid composition for electro-sensitive sound wave absorbing control capable of controlling a characteristic frequency based on an electric field arrangement effect. The present invention relates to a television receiver capable of absorbing a sound wave having a desired frequency by disposing a control device in a cabinet.

[0002]

2. Description of the Related Art FIG. 15 is a view for explaining a conventional television receiver with a built-in speaker, and reference numeral 1 in the figure.
Is a television receiver, and 2 is a television stand for installing the television receiver 1. In this television receiver 1, a cathode ray tube 4 is housed in a box-shaped cabinet 3 which can be broken into two.
Between the cathode ray tube 4 and the cathode ray tube 4 and on both the left and right sides of the cathode ray tube 4, a pair of high frequency speakers 5 and 5 and a pair of middle and low frequency speakers 6 and 6 are arranged. In, the speaker 5 for the high range and the speaker 6 for the middle and low range are arranged vertically.

Further, in the television receiver 1 of this type, since the cabinet 3 has a box-like structure including a front cabinet 3a and a back cabinet 3b as shown in FIG. 16, the volume of the speakers 5 and 6 is increased. The loudspeakers 5 and 6 to the cabinet 3
In order to prevent the sound wave radiated toward the inside from spreading into the cabinet 3 and making the middle and high range of the sound wave a lively sound and deteriorating the acoustic characteristics, the right speakers 5, 6 are arranged.
The sound waves in the mid-high range are cut off by adhering sound wave absorbers 7, 7 made of sponge or the like to the inner surfaces of the front cabinet 3a located on the rear side of and the left side speakers 5, 6 respectively.

[0004]

However, in the conventional television receiver 1, since the cabinet 3 is made of plastic having low rigidity in order to reduce the price and weight, it is suitable for the middle and low range. When the volume of the speaker 6 is increased, there is a problem that a sound wave in a low frequency range is amplified and the cabinet 3 vibrates to generate a noise sound. Further, in the conventional television receiver 1,
The acoustic characteristics vary depending on the material of the TV stand 2 on which the receiver 1 is installed, and the frequency of the sound wave to be blocked also varies depending on the type of program to be watched. Therefore, it is desired to realize a sound wave absorber capable of absorbing sound waves having a desired frequency and changing sound absorption properties according to the type of program to be watched and adjusting so as to have desired acoustic characteristics. It was

However, the sound wave absorbing material 7 used in the conventional television receiver 1 is mainly for absorbing sound waves in the middle and high tones, and its natural frequency depends on its material. Is constant, only the sound wave of the component that matches the natural frequency can be absorbed (removed), and when changing the component of the sound wave to be absorbed, the sound wave absorbing material 7 corresponding to the frequency of the sound wave is used. Need to be replaced with a different material. As described above, it is necessary to prepare a plurality of types of sound wave absorbers having different natural frequencies and select and use a predetermined sound wave absorber corresponding to the frequency of the sound wave component to be absorbed. However, the cost of the sound absorbing device is high and the handling thereof is complicated, resulting in low reliability.

By the way, the inventors of the present invention have developed a fluid composition for electro-sensitive sound wave absorption control (hereinafter referred to as "Electric Noise") having a novel electric field arrangement characteristic which has not been known so far.
-Control fluid composition is abbreviated as "ENC fluid composition"). This fluid composition is, for example, a fluid obtained by dispersing solid particles in an electrically insulating medium. When an electric field is applied to the fluid composition, the solid particles cause dielectric polarization, and electrostatic attraction based on the dielectric polarization causes the solid particles to undergo dielectric polarization. It has the property of forming a chain structure by aligning and aligning in the direction of the electric field. In addition, some solid particles exhibit the property of exhibiting an array lump structure by electrophoresis and array alignment. In this way, the alignment orientation of the particles under the electric field is determined by the electric field alignment effect (hereinafter, referred to as Electric A).
The "light effect" is abbreviated as "EA effect")
The solid particles having such properties are referred to as electric field arranging particles (hereinafter, electric field arranging particles are abbreviated as “EA particles”). Then, the present inventors arrived at the present invention by advancing research on the ENC fluid composition having this novel structure.

The present invention has been made in view of the above problems of the prior art. It absorbs a sound wave of a desired frequency and changes the sound absorbing property according to the type of the program to be watched, the volume of the program, and the like. An object of the present invention is to obtain a television receiver that can be adjusted to have desired acoustic characteristics and that can prevent noise noise from being generated.

[0008]

A television receiver according to claim 1 of the present invention for attaining the above object, wherein a cathode ray tube is housed in a cabinet, and a speaker is arranged in said cabinet. In, a hollow panel having a pair of electrode plates on the front surface and the back surface, an ENC fluid composition housed between the pair of electrode plates, containing EA particles having an EA effect in an electrically insulating medium, A sound wave absorption control device comprising a variable power supply for applying a desired voltage between the pair of electrode plates is arranged in the cabinet.

A television receiver according to a second aspect is the television receiver according to the first aspect,
A voltage adjustment knob is provided on the outside of the cabinet,
The voltage adjusting knob and the variable power source of the sound wave absorption control device are connected to each other. The television receiver according to claim 3 is the television receiver according to claim 1 or 2, wherein the sound wave absorption control device is directly attached to an inner surface of the cabinet, and at least the sound wave absorption control device is provided. It is characterized in that the electrode plate on the inside surface of the cabinet is made of a material that is flexible against sound waves.
The television receiver according to claim 4 is the television receiver according to claim 1 or 2, wherein the sound wave absorption control device is disposed with a gap between the sound wave absorption control device and the inner surface of the cabinet. The front surface side electrode plate and the back surface side electrode plate of the sound wave absorption control device are both made of a material that is flexible against sound waves. A television receiver according to a fifth aspect is the television receiver according to any one of the first to fourth aspects, characterized in that a sound wave absorbing material is arranged in the cabinet.

[0010]

In the sound wave absorption control device used in the television receiver of the present invention, the EA particles having the EA effect in the ENC fluid composition are electrically insulating when no voltage is applied between the pair of electrode plates. It randomly floats and disperses in the medium. When a voltage is applied to the pair of electrode plates by the variable power source, the EA particles are arrayed and linked in a chain to form a chain (particle chain), and the chain is arrayed in parallel with the electric field direction. When a sound wave (air vibration) is applied to one of the electrode plates in this state, the electrode plate vibrates in the opposite direction, but the chain body itself has elasticity, so the chain body pulls. When the particles are opposed to each other, they attract each other to generate an attractive force, and when they are compressed, they bend to generate a repulsive force, which causes a viscous resistance due to the movement of the chain in the electrically insulating medium, which causes a sound wave. Loss of energy (dissipation) occurs.

That is, the sound wave incident on the electrode plate causes the ENC fluid composition containing the chain to resonate with the electrode plate. The sound wave frequency that gives vibration to such a chain is determined by the characteristic frequency of the chain (which is presumed to be the so-called natural frequency, which is the balance between the elasticity of the chain and the inertia of the electrode plate). When a sound wave having a frequency matching the characteristic frequency is incident on the electrode plate, the chain resonates and absorbs the sound wave, and sound waves of other frequencies are reflected.

Since the attractive force (stress generated in the chain) acting between the particles increases as the voltage applied to the pair of electrode plates increases, the elastic modulus and viscosity of the chain itself are applied. The present invention takes advantage of this as the voltage increases as the voltage increases. In other words, by adjusting the applied voltage so that the characteristic frequency of the chain itself matches the frequency of the component of the incident sound wave (air vibration) that you want to remove, the chain resonates and absorbs sound. It consumes the energy of the component to be (removed) and reflects the other components.

Therefore, in the television receiver of the present invention, since the sound wave absorption control device as described above is arranged in the cabinet, the ENC fluid is adjusted according to the frequency of the component of the sound wave to be absorbed. The ENC fluid composition is radiated from the speaker into the cabinet without changing the ENC fluid composition by adjusting the value of the applied voltage across the pair of electrodes of the sound absorption control device to set the characteristic frequency of the composition. Since it can absorb sound waves of various frequencies, it can be adjusted to have desired acoustic characteristics according to the type of program to be watched, volume, etc., and in particular, it absorbs sound waves in the low frequency range. Therefore, even if the cabinet is made of a material with low rigidity, it is possible to prevent the cabinet from vibrating without amplifying sound waves in the low range. That. Further, in the television receiver of the present invention, the position and number of the sound wave absorption control devices to be installed in the cabinet are adjusted at the time of manufacture, and further applied to the pair of electrodes of each sound wave absorption control device at the time of use. By adjusting the applied voltage value, for example, it is possible to absorb sound waves having different frequencies for each sound wave absorption control device.

FIG. 1 is a graph showing the results of measuring the influence of the electric field strength on the EA characteristics for a 30 wt% EA particle dispersion system. It is clear from this graph that the stress acting on the chain increases as the applied voltage increases. EA
The characteristic is that the dielectrically polarized particles are arranged in the direction of the electric field by an electric attraction to form a chain structure. At low shear rates, electrical attraction dominates, resulting in a gradual cycle of breaking and reforming chain structures. The yield stress is the force that is generated when a chain arranged in the direction of the electric field undergoes shear failure in the direction perpendicular to it. Considering that the particles of all chains formed have the same diameter and connect the electrode plates in a straight line, the number of chains is proportional to the particle concentration.
The yield stress will also be proportional to the particle concentration. FIG. 2 shows an equivalent circuit of the vibration system of the present invention, that is, a coil spring 8a having an elastic modulus K and a dashpot 8b having a viscosity C are connected in parallel between a pair of electrode plates.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 3 is a plan view of the television receiver of the embodiment of the present invention when the inside is seen from the top surface thereof, and the reference numeral 9 in FIG. 3 is the television receiver. This television receiver 9 is different from the conventional television receiver 1 shown in FIG.
Instead of attaching the sound wave absorbing materials 7, 7 to the inner surfaces of the front cabinet 3a located behind the left and the left speakers 5, 6, respectively, the sound wave absorption control devices 10, 10 are attached respectively, and these sound wave The sound wave absorption control devices 10 and 10 are attached to the inner surface of the back cabinet 3b located behind the absorption control devices 10 and 10, respectively, and the voltage adjustment knob 10e connected to the variable power supply 16 described later is connected to the outside of the front cabinet 3a. This is the point where the individual pieces are provided.

The sound wave absorption control device 10 has a plate shape for absorbing sound waves having a desired frequency, and has a rectangular plate-like appearance, and has a rectangular cross section as shown in FIG. It is a thing. The sound wave absorption control device 10 includes a hollow panel 11, a pair of electrode plates 12 and 13 provided on the hollow panel 11, an ENC fluid composition 15, and a variable power source 16.
It consists of

The hollow panel 11 includes a surface material 17 and a backing material 1 which is arranged to face the surface material 17 with a gap therebetween.
8 and a frame-shaped sealing member 19 fixed to the peripheral edges of the surface material 17 and the backing material 18. As the surface material 17, various plastic films such as a PET (polyethylene terephthalate) film, a PVC (vinyl chloride) film, a nylon film, a polyethylene film, a polypropylene film, and an acrylic film, which are flexible against sound waves, are used. Lining material 18
For example, a metal plate having conductivity is preferably used. When the backing material 18 is a metal plate, the backing material 18 also serves as the electrode plate 13.

The electrode plate 12 is uniformly adhered to the surface material 17 along the inner wall of the surface material 17, and a gap (composition containing space) is formed between the electrode plate 12 and the electrode plate 13. . The ENC fluid composition 15 containing the EA particles 21 having the EA effect described above in the electrically insulating medium 22 is housed in a sealed state between the pair of electrode plates 12 and 13. . In addition, one of the electrode plates 12 and the surface material 17 has a fixed peripheral edge, but is configured so that it can vibrate in the direction in which the pair of electrode plates 12 and 13 face each other (the vertical direction indicated by the arrow X in FIG. 4). Has been done. Thereby, when the sound wave (air vibration) 24 is incident on the surface material 17, the surface material 17 and the one electrode plate 12 can vibrate vertically.

Reference numeral 16 is a variable power source for applying a desired voltage between the pair of electrode plates 12 and 13. The variable power source 1
A switch 27 is connected to 6 in series. By turning on the switch 27, the pair of electrode plates 12,
A voltage can be applied between 13.

The variable power source 1 of the sound wave absorption control device 10
6 is connected to a corresponding voltage adjusting knob 10e, and the voltage adjusting knob 16 can adjust the voltage applied between the pair of electrode plates 12 and 13 of the sound wave absorption control device 10 corresponding thereto. You can do it.

When the sound wave absorption control device 10 as described above is attached to the inner surface of the front cabinet 3a, its surface material 1
It is desirable that the surface 7 side faces the speakers 5 and 6, and when the inner surface of the back cabinet 3b is stuck, the surface 17 side faces the inside of the cabinet 3. It is desirable to attach it as follows.

In the television receiver 9 of the above embodiment, the case where the appearance of the sound wave absorption control device 10 is a rectangular plate has been described, but it goes without saying that the appearance is a circular plate according to the installation location in the cabinet 3. It may be in the form of a circle or any other suitable shape. Also, the hollow panel 1
Although the case where 1 is provided with the surface material 17 has been described, in the case where the electrode plate 12 is made of a material having a strength capable of containing the ENC fluid composition 15 and is made of a material that is flexible against sound waves, The surface material 17 may not be provided. In that case, when the sound wave absorption control device 10 is attached to the inner surface of the front cabinet 3a, it is desirable that the surface of the electrode plate 12 side faces the speakers 5 and 6.
Further, when sticking to the inner surface of the back cabinet 3b, it is desirable to stick so that the surface on the electrode plate 12 side faces the inside of the cabinet 3. Further, the case where the backing material 18 made of a metal plate of the hollow panel 11 also serves as the electrode plate 13 has been described, but when the backing material 18 is made of a material having no conductivity, the inner wall of the backing material 18 is The electrode plate 13 is evenly fixed along it.

The EA particles 21 are composed of a core made of an organic polymer compound and an electric field aligning inorganic substance (hereinafter referred to as "EA").
Inorganic / organic composite particles formed by a surface layer containing an inorganic material). The EA inorganic substance is at least one selected from the group consisting of an inorganic ion exchanger, silica gel, and an electric semiconductor inorganic substance. When the EA inorganic substance is an inorganic ion exchanger, the inorganic ion exchanger includes hydroxides of polyvalent metals, hydrotalcites, acid salts of polyvalent metals, hydroxyapatite, Nasicon type compounds, clay minerals, titanium. At least one selected from the group consisting of potassium acid salts, heteropolyacid salts and insoluble ferrocyanides is preferable.

When the EA inorganic substance is an electric semiconductor inorganic substance, the electric semiconductor inorganic substance is 10 ³ Ω at room temperature.
It is preferable ^-1 cm ^-1 to those having electrical conductivity in the range of 10 ^-11 Omega ^-1 cm ^-1. This electrically semiconductive inorganic substance is a metal oxide, a metal hydroxide, a metal oxide hydroxide, an inorganic ion exchanger, a metal-doped one or more of these, and whether or not metal-doped. It is preferable that it is at least one selected from the group consisting of at least one of these materials applied on another support as an electric semiconductor layer.

Next, FIG. 5 shows a specific example of the ENC fluid composition 15. In this ENC fluid composition 15, EA particles 21 which are solid particles are uniformly dispersed in an electrically insulating medium 22. The EA particles 21 include a core body 33 made of an organic polymer compound and particles 3 made of an EA inorganic substance.
And the surface layer 35 of 4 to form the inorganic-organic composite particles. In this specific example, the electrically insulating medium 22 is colorless and transparent silicone oil, the organic polymer compound forming the core body 33 of the inorganic / organic composite particles is polyacrylic ester, and the EA forming the surface layer 35.
The inorganic particles 34 are white titanium hydroxide that is both an inorganic ion exchanger and an electric semiconductor inorganic material. The color of the EA particles (inorganic / organic composite particles) 21 is, for example, white. The proportion of the EA particles 21 contained in the electrically insulating medium 22 is 7.5% by weight, for example.

As shown in FIG. 6, this ENC fluid composition 15 comprises a pair of electrode plates 12, 1 which are spaced apart and arranged in parallel.
It intervenes between 3. As shown in FIG. 7, when a voltage is applied to the pair of electrode plates 12 and 13 from the variable power source 16 through the switch 27, the EA particles 21 are generated by the EA effect.
Are arranged in a chain in a direction perpendicular to the surfaces of the electrode plates 12 and 13 to form a chain (particle chain) 36. At this time, the chain-like bodies 36 are spaced apart from each other and oriented in parallel.

Next, the operation of the sound wave absorption control apparatus 10 having the above configuration will be described. As shown in FIG. 4, when no voltage is applied between the pair of electrode plates 12 and 13, E
The EA particles 21 of the NC fluid composition 15 are the electrically insulating medium 2
Floating / randomly distributed in 2 (see Fig. 6). When a voltage is applied to the pair of electrode plates 12 and 13, E
The EA particles 21 in the NC fluid composition 15 are arrayed and linked in a chain to form a chain (particle chain) 36, and the chain 36 is arrayed parallel to the electric field direction (see FIG. 7).

In this state, when a sound wave (air vibration) 24 is made incident on one of the electrode plates 12, (a), (b) of FIG.
The states of (c) and (d) occur sequentially, and the electrode plate 12 vibrates in the opposite direction as shown by the arrow X (see FIGS. 4 and 9) together with the surface material 17, but the chain-like body 36 itself. As shown in FIG. 8B, since the chain-like body 36 has elasticity, when it is compressed, the chain-like body 36 bends in a dogleg shape, for example, to generate a repulsive force. When the chain-shaped body 36 is pulled, the EA particles 21 facing each other attract each other to generate an attractive force, as shown in FIG. As a result, the movement of the chain-like body 36 in the ENC fluid composition 15 causes viscous resistance, resulting in loss of energy (dissipation) of the sound wave 24.

As the electrode plate 12 vibrates,
The chain 36 is repeatedly pulled and compressed, and as a result, the chain 36 itself vibrates.
That is, the chain member 3 is applied to the sound wave 24 incident on the electrode plate 12.
The ENC fluid composition 15 containing 6 resonates with the electrode plate structure composed of the electrode plate 12 and the surface material 17. The frequency of the sound wave that gives vibration to the chain 36 is determined by the characteristic frequency of the chain 36. When the sound wave 24 having a frequency matching the characteristic frequency enters the electrode plate 12, the chain 36 Resonates (see arrows A and B in FIG. 9) to absorb the sound wave, and the sound wave 25 of another frequency is reflected.

The force acting between the EA particles 21 (stress generated in the chain-like body 36) increases as the voltage applied to the pair of electrode plates 12 and 13 increases, so that the elasticity of the chain-like body 36 itself. The modulus and viscosity increase with increasing applied voltage. The present invention utilizes this fact to remove a desired component of a sound wave. That is, by adjusting the applied voltage to match the characteristic frequency of the particle chains 36 with the frequency of the component (sound wave having a specific wavelength) to be removed from the sound wave (air vibration) incident on the electrode plate 12, As shown in FIG. 9, the chain 36 is moved by the action of inertial force to the left and right arrows A,
As shown by B, it resonates (resonates), consumes the energy of the component of the incident sound wave 24 to be removed, and reflects other sound wave components (denoted by reference numeral 25). In this way, the applied voltage can absorb the component of the desired specific wavelength of the incident sound wave 24.

The characteristic frequency of the sound wave absorption control device 10 is E
It changes depending on the size of the A particles (solid particles) 21, the elastic force acting between the EA particles 21, the natural frequency of the electrode plate 12, the distance between the pair of electrode plates 12 and 13, and the like. In the present invention, since the spherical EA particles 21 having a substantially uniform particle size are dispersed in the electrically insulating medium 22 (without using irregular particles), the above-mentioned repulsive force and attractive force are maintained under a constant voltage. Does not fluctuate, and the balance between the elastic force acting between the EA particles 21 and the inertial force of the electrode plate hardly fluctuates. In the above-mentioned embodiment, the chain-like member 36 is supposed to be bent in a V-shape, but in addition to this, for example, an S-shape as shown in FIG. W as shown in b)
It is considered that there is a case where it is bent into a letter shape.

Further, in the above embodiment, the phenomenon in which the EA particles (inorganic / organic composite particles) 21 form a row of chain-like bodies 36 and are arranged in parallel by the application of an electric field has been described. When the number of the chains exceeds 30% by weight, the chains 36 are not joined in one row but a plurality of rows are joined to each other to form a column 39 as shown in FIG. Come to do. In this column 39, the left and right chain-shaped EA particles 21 are shifted one by one and adjoin each other in a staggered manner. Regarding this, the present inventors have shown in FIG.
It is because it is more stable in terms of energy that the EA particles 21 that are dielectrically polarized in the + pole portion and the − pole portion are alternately adjacent to each other and the + pole portion and the − pole portion are attracted to each other, as shown in FIG. I'm estimating. Further, in the above embodiment, the ENC fluid composition 15 is directly accommodated between the pair of electrode plates 12 and 13, but the ENC fluid composition 15 is not limited to this.
A porous body sufficiently impregnated with the fluid composition 15 may be housed between the pair of electrode plates 12 and 13. In this case, the porous body preferably has open cells so as not to impair the EA effect.

The electrically insulating medium 22 used in the ENC fluid composition 15 of the present invention is, for example, diphenyl chloride,
Butyl sebacate, aromatic polycarboxylic acid higher alcohol ester, halophenyl alkyl ether, trans oil, chlorinated paraffin, fluorine oil, silicone oil, fluorosilicone oil, etc. Chemically stable and E
Any fluid or a mixture thereof can be used as long as it can stably disperse the A particles. The electrically insulating medium 22 can be colored according to the purpose. For coloring, it is preferable to use a type and amount of an oil-soluble dye or a dispersible dye that is soluble in the selected electrically insulating medium and does not impair its electrical properties. The electrically insulating medium 22 may further contain a dispersant, a surfactant, a viscosity modifier, an antioxidant, a stabilizer and the like.

The kinematic viscosity of this electrically insulating medium 22 is 1c.
It is preferably in the range of St to 30,000 cSt. When the kinematic viscosity is less than 1 cSt, the storage stability of the ENC fluid composition 15 is insufficient, and the kinematic viscosity is 300.
If it is larger than 00 cSt, it becomes difficult to uniformly disperse the EA particles, and bubbles are entangled during the adjustment to make it difficult for the bubbles to escape, which is unfavorable for handling. From this point of view, the kinematic viscosity is 10 cSt to 1000.
It is preferably in the range of cSt, particularly preferably in the range of 10 cSt to 100 cSt. Of course, the kinematic viscosity of the electrically insulating medium 22 changes with temperature, and this temperature effect can be suppressed by the applied voltage.

The EA particles 21 used in the present invention are EA
Any material such as an element, an organic compound, an inorganic compound, or a mixture thereof can be used as long as it is an inorganic / organic composite particle having an effect. Examples thereof include particles of inorganic ion exchangers, metal oxides, silica gel, inorganic substances having electric semiconductors, carbon black, and particles having these as a surface layer.
However, the EA particles 21 are inorganic-organic composite particles formed by the core body 33 made of an organic polymer compound and the surface layer 35 made of the EA inorganic particles 34, as shown in the above-mentioned examples. Is particularly preferable. This inorganic
Organic composite particles are EA inorganic particles 3 having a relatively high specific gravity.
The surface layer 35 composed of 4 is carried on the core body 33 which is an organic polymer compound having a relatively low specific gravity, and the specific gravity of the whole particles can be adjusted so as to approximate to the electrical insulating medium 22. Therefore, the ENC fluid composition 15 obtained by dispersing this in the electrically insulating medium 22 has excellent storage stability.

Examples of the organic polymer compound that can be used as the core 33 of the EA particles (inorganic / organic composite particles) 21 include poly (meth) acrylic acid ester, (meth) acrylic acid ester-styrene copolymer, One or a mixture or copolymer of polystyrene, polyethylene, polypropylene, nitrile rubber, butyl rubber, ABS resin, nylon, polyvinyl butyrate, ionomer, ethylene-vinyl acetate copolymer, vinyl acetate resin, polycarbonate resin and the like. Can be mentioned.

Various particles can be used as the particles 34 which are the EA inorganic material forming the surface layer 35, but preferred examples include an inorganic ion exchanger, silica gel and an electrically semiconductive inorganic material. When the surface layer 35 is formed on the core body 33 made of an organic polymer using these particles 34, the obtained inorganic / organic composite particles are useful EA.
It becomes the particles 21.

Examples of the above inorganic ion exchanger include (1)
Hydroxide of polyvalent metal, (2) hydrotalcites,
(3) Acid salt of polyvalent metal, (4) Hydroxyapatite, (5) Nasicon type compound, (6) Clay mineral, (7)
Mention may be made of potassium titanates, (8) heteropolyacid salts, and (9) insoluble ferrocyanide.

The respective inorganic ion exchangers will be described in detail below. (1) Hydroxide of polyvalent metal. These compounds are represented by the general formula MO _x (OH) _y (M is a polyvalent metal, x is a number of 0 or more, and y is a positive number), and examples thereof include titanium hydroxide and hydroxide. zirconium,
Examples include bismuth hydroxide, tin hydroxide, lead hydroxide, aluminum hydroxide, tantalum hydroxide, niobium hydroxide, molybdenum hydroxide, magnesium hydroxide, manganese hydroxide, and iron hydroxide. Here, for example, titanium hydroxide refers to hydrous titanium oxide (also known as metatitanic acid or β-titanic acid, Ti
It contains both O (OH) ₂ ) and titanium hydroxide (also known as orthotitanic acid or α-titanic acid, Ti (OH) ₄ ), and the same applies to other compounds.

(2) Hydrotalcites. These compounds have the general formula M ₁₃ Al ₆ (OH) ₄₃ (C
O) ₃ · 12H ₂ O (M is a divalent metal),
For example, the divalent metal M is Mg, Ca or Ni. (3) Acid salt of polyvalent metal. These are, for example, titanium phosphate, zirconium phosphate, tin phosphate, cerium phosphate, chromium phosphate, zirconium arsenate, titanium arsenate, tin arsenate, cerium arsenate, titanium antimonate, tin antimonate, tantalum antimonate. , Niobium antimonate, zirconium tungstate, titanium vanadate, zirconium molybdate, titanium selenate, and tin molybdate.

(4) Hydroxyapatite. These are, for example, calcium apatite, lead apatite,
Examples include strontium apatite and cadmium apatite. (5) Nasicon type compound. These include, for example, (H ₃ O) Zr ₂ (PO ₄ ) ₃ but in the present invention, a Nasicon type compound in which H ₃ O is replaced with Na can also be used. (6) Clay mineral. These are, for example, montmorillonite, sepiolite, bentonite and the like, with sepiolite being particularly preferred.

(7) Potassium titanates. These general formula _{aK 2 O · bTiO 2 · nH} 2 O (a 0
<A is a positive number that satisfies a ≦ 1, b is a positive number that satisfies 1 ≦ b ≦ 6, and n is a positive number), for example, K ₂ ·
TiO ₂ · 2H ₂ O, K ₂ O · 2TiO ₂ · 2H ₂ O, 0.
5K ₂ O ・ TiO ₂・ 2H ₂ O, and K ₂ O ・ 2.5TiO
₂ · 2H ₂ O, and the like. In addition, among the above compounds, a compound in which a or b is not an integer is easily synthesized by subjecting a compound in which a or b is an appropriate integer to an acid treatment and replacing K with H.

(8) Heteropolyacid salt. These are represented by the general formula H ₃ AE ₁₂ O ₄₀ .nH ₂ O (A is phosphorus, arsenic, germanium, or silicon, E is molybdenum, tungsten, or vanadium, and n is a positive number), For example, ammonium molybdophosphate and ammonium tungstophosphate. (9) Insoluble ferrocyanide. These are compounds represented by the following general formula. M _b-pxa
A [E (CN) ₆ ] (M is an alkali metal or hydrogen ion, A is a heavy metal ion such as zinc, copper, nickel, cobalt, manganese, cadmium, iron (III) or titanium, E is iron (II), iron (III), cobalt (II) or the like, b is 4 or 3, a is a valence of A, and p is a positive number of 0 to b / a.) These include, for example, Cs. Insoluble ferrocyanine compounds such as ₂ Zn [Fe (CN) ₆ ] and K ₂ Co [Fe (CN) ₆ ] are included.

The inorganic ion exchangers (1) to (6) each have an OH group, and some or all of the ions present at the ion exchange sites of these inorganic ion exchangers are different from other ions. Those substituted with (hereinafter, referred to as a substitutional inorganic ion exchanger) are also included in the inorganic ion exchanger of the present invention. That, R-M ¹ inorganic ion exchanger described above (M ¹ represents an ion species of the ion exchange sites) is expressed as a part or all of M ¹ in the R-M ^1, the ion exchange reaction below A substituted inorganic ion exchanger in which an ionic species M ² different from M ¹ is substituted by
It is an inorganic ion exchanger in the present invention. xR−M ¹ + yM ² → Rx− (M ² ) y + xM ¹ (where x and y represent the valences of the ion species M ² and M ¹ , respectively). M ¹ varies depending on the type of the inorganic ion exchanger having an OH group, but when the inorganic ion exchanger exhibits a cation exchange property, M ¹ is generally H ⁺ , and in this case, M ² is an alkali metal or an alkali. Any metal ion other than H ⁺ , such as earth metals, polyvalent typical metals, transition metals or rare earth metals. When the inorganic ion exchanger having an OH group exhibits anion exchange property, M ¹ is generally OH ^−.
Where M ² is, for example, I, Cl, SCN, N
Any of anions other than OH ⁻ such as O ₂ , Br, F, CH ₃ COO, SO ₄ or CrO ₄ and complex ions.

Further, regarding the inorganic ion exchanger which has once lost the OH group due to the high temperature heat treatment but becomes to have the OH group again by an operation such as immersion in water, the inorganic ion after the high temperature heat treatment is used. Exchangers and the like are also a kind of inorganic ion exchangers that can be used in the present invention, and specific examples thereof include a Nasicon type compound such as (H ₃ O) Zr ₂
(PO ₄₎ HZr ₂ obtained by heating ₃ (PO _{4) 3} and high-temperature heat treatment of hydrotalcite (500 to 70
Heat treated at 0 ° C.) and the like. These inorganic ion exchangers can be used not only in one kind but also in many kinds simultaneously as a surface layer. It is particularly preferable to use a hydroxide of a polyvalent metal and an acid salt of a polyvalent metal as the above-mentioned inorganic ion exchanger.

EA particles (inorganic / organic composite particles) 21
An example of the electrically semiconductive inorganic material that can be used as the surface layer 35 of is an electric conductivity of 10 ³ to 10 ^-11 Ω ^-1 / cm at room temperature.
Metal oxides, metal hydroxides, metal oxide hydroxides, inorganic ion exchangers, or metal-doped ones of at least one of these, or at least any one of them regardless of the presence or absence of metal doping. For example, the seed is applied to another support as an electric semiconductor layer.

Examples of preferable electric semiconductor inorganic materials are shown below. (A) Metal oxide: For example, SnO ₂ or amorphous titanium dioxide (manufactured by Idemitsu Petrochemical Co., Ltd.). (B) Metal hydroxide: For example, titanium hydroxide or niobium hydroxide. Here, titanium hydroxide means hydrous titanium oxide (manufactured by Ishihara Sangyo Co., Ltd.), metatitanic acid (also known as β-titanic acid,
TiO (OH) ₂ ) and orthotitanic acid (also known as α-titanic acid, Ti (OH) ₄ ) are included. (C) Metal oxide hydroxide: For example, FeO
(OH) (goethite) and the like can be mentioned. (D) Hydroxide of polyvalent metal: equivalent to inorganic ion exchanger (1). (E) Hydrotalcites: Inorganic ion exchanger (2)
Equivalent to (F) Acid salt of polyvalent metal: equivalent to the inorganic ion exchanger (3). (G) Hydroxyapatite: Inorganic ion exchanger (4)
Equivalent to (H) Nashicon type compound: equivalent to the inorganic ion exchanger (5). (I) Clay mineral: equivalent to the inorganic ion exchanger (6). (J) Potassium titanate: equivalent to the inorganic ion exchanger (7). (K) Heteropolyacid salt: equivalent to the inorganic ion exchanger (8). (L) Insoluble ferrocyanide: equivalent to inorganic ion exchanger (9). (M) Metal-doped EA inorganic substance: This is obtained by doping the EA inorganic substance with a metal such as antimony (Sb) in order to increase the electric conductivity of the above-mentioned electric semiconductor inorganic substances (A) to (L). For example, antimony (S
b) Doping tin oxide (SnO ₂ ) and the like can be mentioned. (N) EA inorganic material applied as an electric semiconductor layer on another support: for example, titanium oxide, silica as a support,
Examples thereof include inorganic particles such as alumina and silica-alumina, or organic polymer particles such as polyethylene and polypropylene, to which antimony (Sb) -doped tin oxide (SnO ₂ ) is applied as an electric semiconductor layer. . The particles in which the EA inorganic substance is applied to the other support as described above can be regarded as the EA inorganic substance as a whole. These EA minerals are not only one type, but two
It is also possible to use types or more simultaneously as the surface layer.

The EA particles (inorganic / organic composite particles) 21 are
It can be manufactured by various methods. For example, there is a method in which a particulate core body 33 made of an organic polymer compound and fine particulate particles 34 are transported by a jet stream and collided with each other to produce the particles. In this case, the fine particles of the particles 34 collide with the surface of the particulate core body 33 at a high speed and are fixed to form the surface layer 35. As another example of the manufacturing method, there is a method in which the particulate core body 33 is suspended in a gas, and a solution of the particles 34 is atomized and sprayed on the surface thereof. In this case, the solution adheres to the surface of the core body 33 and is dried so that the surface layer 3
5 is formed.

A particularly preferred method for producing the EA particles (inorganic / organic composite particles) 21 is the core layer 33 and the surface layer 35 at the same time.
Is a method of forming. This method is performed by, for example, the core body 33.
When emulsion-polymerizing, suspension-polymerizing, or dispersion-polymerizing a monomer of an organic polymer compound that forms a polymer, particles 34, which are finely divided EA inorganic substances, are present in the monomer or in the polymerization medium. Is.
Water is preferred as the polymerization medium, but a mixture of water and a water-soluble organic solvent can also be used, and an organic poor solvent can also be used. According to this method, the monomers are polymerized in the polymerization medium to form the core particles 33, and at the same time, the fine particle EA inorganic particles 34 are oriented in a layered manner on the surface of the core 33 to cover the particles. The surface layer 35 is formed.

When the EA particles (inorganic / organic composite particles) 21 are produced by emulsion polymerization or suspension polymerization, the particles of the EA inorganic material are combined by combining the hydrophobic property of the monomer and the hydrophilic property of the EA inorganic material. Most of 34 can be attached to the surface of the core 33. According to the method for simultaneously forming the core body 33 and the surface layer 35, the EA inorganic particle 34 is formed on the surface of the core body 33 made of an organic polymer compound.
Adhere to each other closely and firmly to form robust EA particles (inorganic / organic composite particles) 21.

The shape of the EA particles 21 used in the present invention does not necessarily have to be spherical, but the particle-shaped core body 33 is used.
In the case where the EA particles 21 are manufactured by the emulsion-suspension polymerization method in which is controlled, the shape of the obtained EA particles 21 is substantially spherical.
Although the particle size of the EA particles 21 is not particularly limited,
0.1 μm to 500 μm, especially 5 μm to 200
It is preferably within the range of μm. The particle size of the fine particles EA inorganic particles 34 at this time is not particularly limited, but is preferably 0.005 μm to 100 μm.
μm, more preferably 0.01 μm to 10 μm.

In the EA particles (inorganic / organic composite particles) 21, the weight ratio of the EA inorganic particles 34 forming the surface layer 35 to the organic polymer compound forming the core 33 is not particularly limited, In order to obtain the ENC fluid composition 15 with high storage stability, the particles 34 should be added to the total weight of the EA inorganic particles 34 and the organic polymer compound core 33.
Is preferably in the range of 1% to 60% by weight, particularly preferably in the range of 4% to 30% by weight. When the proportion of the core 33 is less than 1% by weight, the obtained EA particles 2
When the EA characteristic of 1 becomes insufficient and exceeds 60% by weight,
There is a possibility that the specific gravity of the EA particles 21 becomes excessive and the storage stability is impaired. The ENC fluid composition 15 of the present invention also comprises
The above-mentioned EA particles 21 can be manufactured by uniformly stirring and mixing in the electrically insulating medium 22 together with a dispersant and other components, if necessary. As the stirrer, any stirrer normally used for dispersing solid particles in a liquid dispersion medium can be used. The content of the EA particles 21 in the electrically insulating medium 22 is not particularly limited, but it is 0.
It is preferably from 5 to 75% by weight, particularly preferably from 5 to 50% by weight. If the content is less than 1%, a sufficient EA effect cannot be obtained, and if it is more than 75%, the initial viscosity of the ENC fluid composition 15 when a voltage is not applied becomes too large, which makes it difficult to use.

Various methods described above, particularly the core body 33 and the surface layer 35.
EA particles produced by a method of simultaneously forming and
In No. 1, the surface layer 35 is wholly or partially covered with a thin film of an organic polymer substance, a dispersant used in the manufacturing process, an emulsifier and other additive substances, and the EA effect as EA particles is not sufficiently exhibited. There are cases. This thin film of inert material can be easily removed by polishing the surface of the particles. Therefore, when the core body 33 and the surface layer 35 are simultaneously formed, it is preferable to polish the surfaces thereof.

The surface of the particles can be polished by various methods. For example, EA, which is an inorganic / organic composite particle
The method can be performed by dispersing the particles 21 in a dispersion medium such as water and stirring this. At this time, the EA particles 2 are mixed with an abrasive such as sand particles or balls in the dispersion medium.
It can also be carried out by a method of stirring with 1 or a method of stirring with a grinding wheel. For example, again
It is also possible to carry out dry stirring using the EA particles 21 and the above-mentioned abrasive or grinding stone without using the dispersion medium.

A more preferable polishing method is EA particles 21.
Is a method of stirring the air flow by a jet air flow or the like.
This is a method of polishing particles by violently colliding with each other in a gas phase, and is a preferable method in that the polished particles can be easily separated by classification without the need for another abrasive. In the above jet stream agitation, it is necessary to select polishing conditions depending on the type of equipment used, the agitation speed, the material of the EA particles 21, etc., but generally 0.5 min to 15 min at a stirring speed of 6000 rpm.
It is preferable to stir with a jet stream.

The ENC fluid composition 15 of the present invention can be manufactured by uniformly stirring and mixing the above-mentioned EA particles 21 in the electrically insulating medium 21 together with other components such as a dispersant, if necessary. As the stirrer, any stirrer normally used for dispersing solid particles in a liquid dispersion medium can be used.

In the television receiver 9 of the above embodiment, the sound wave absorption control devices 10 and 10 are provided on the inner surfaces of the front cabinet 3a located behind the right speakers 5 and 6 and behind the left speakers 5 and 6, respectively. And the sound wave absorption control devices 10 and 10 are respectively adhered to the inner surfaces of the back cabinet 3b located behind the sound wave absorption control devices 10 and 10, and the four voltage adjustment knobs 10e are provided outside the front cabinet 3a. Since it is provided, in order to set the characteristic frequency of the ENC fluid composition 15 in accordance with the frequency of the component of the sound wave 24 to be absorbed, the pair of electrodes 12, 13 of each sound wave absorption control device 10 is set. By adjusting the applied voltage value to be applied, the ENC fluid composition 15 is radiated from the speaker into the cabinet without being changed. Since it can absorb sound waves of various frequencies, it can be adjusted to have desired acoustic characteristics according to the type of program to be watched, volume, etc., and in particular, it can absorb sound waves in the low frequency range. Therefore, even if the cabinet 3 is made of a material having low rigidity, the sound wave in the low range is not amplified and the cabinet 3 does not vibrate, so that the generation of noise sound can be prevented.

The television receiver 9 of the above embodiment
In this case, the position and number of the sound wave absorption control devices 10 arranged in the cabinet 3 are adjusted during manufacturing, and the applied voltage value applied to the pair of electrodes 12 and 13 of each sound wave absorption control device 10 during use. By adjusting, for example, it is possible to absorb sound waves having different frequencies for each sound wave absorption control device 10, and thus it is possible to change the sound wave absorption control range for each part in the cabinet 3, There is an advantage in that it is possible to impart a unique sound wave absorption control performance to each necessary portion.

FIG. 12 shows another embodiment of the television receiver of the present invention. The difference between the television receiver 49 shown in FIG. 12 and the television receiver 9 shown in FIG. , The back surface of the back cabinet 3b located behind the sound wave absorption control devices 10, 10 provided on the inner surface of the front cabinet 3a.
Instead of sticking each of them, the sound wave absorption control device 50,
It is the point that 50 is respectively arranged with a gap between it and the inner surface of the back cabinet 3b. FIG. 13 is a cross-sectional view showing the sound wave absorption control device 50. The difference between the sound wave absorption control device 50 and the sound wave absorption control device 10 shown in FIG. For example PET
(Polyethylene terephthalate) film, PVC (vinyl chloride) film, nylon film, polyethylene film, polypropylene film, acrylic film, and other various plastic films, and the electrode plate 13 is uniform along the inner wall of the backing material 18. The point is that the hollow panel 11 fixed to the above is provided. In the television receiver 49 of the above-described embodiment, the sound waves of various frequencies radiated from the speakers 5, 6 toward the cabinet 3 are treated with the surface material 17 side of the sound wave absorption control device 50 and the backing material 18. Since the sound can be absorbed by both sides, the degree of freedom of the arrangement angle of the sound wave absorption control device 50 in the cabinet 3 is large, and adjustment is performed so as to have desired acoustic characteristics according to the type of program to be viewed, the volume, and the like. Easy to do. In the television receiver 49 of the above embodiment, the hollow panel 11 is the surface material 1.
7 and the case where the backing material 18 is provided, the electrode plates 12 and 13 are made of a material having a strength capable of accommodating the ENC fluid composition 15 and made of a material that is flexible against sound waves. May not include the surface material 17 and the backing material 18.

FIG. 14 shows another embodiment of the television receiver of the present invention. The television receiver 59 shown in FIG. 14 is different from the conventional television receiver 1 shown in FIG. However, the sound wave absorption control devices 10, 10 are provided on the inner surface of the back cabinet 3b located behind the sound wave absorbing materials 7, 7 attached to the inner surface of the front cabinet 3a.
Is attached, and two voltage adjusting knobs 10e connected to the variable power source 16 are provided outside the front cabinet 3a. The television receiver 59 of the above embodiment
In this case, it is possible to block the sound waves in the mid-high range of components that match the natural frequency of the sound wave absorbers 7, 7 and adjust the applied voltage value applied to the pair of electrodes 12, 13 of each sound wave absorption control device 10. As a result, since the sound wave in the low range can be absorbed, the sound wave in the low range is not amplified, and even if the cabinet 3 is made of a material having low rigidity, the cabinet 3 does not vibrate. The generation of noise noise can be prevented.

In each of the above embodiments,
A cathode-ray tube 4 is housed in the cabinet 3, and a pair of high-frequency speakers 5 are provided between the cabinet 3 and the cathode-ray tube 4 and on both the left and right sides of the cathode-ray tube 4.
The case where the sound wave absorption control device 10 is installed in the cabinet 3 of the television receiver in which the speaker 5 and the pair of speakers 6 and 6 for middle and low frequencies are provided is described. Any structure can be similarly applied.

[0062]

Since the television receiver of the present invention is constructed as described above,
The following effects are achieved. The ENC fluid composition is adjusted by adjusting the applied voltage value applied to a pair of electrodes of each sound wave absorption control device in order to set the characteristic frequency of the ENC fluid composition according to the frequency of the component of the sound wave to be absorbed. Since sound waves of various frequencies radiated from the speaker into the cabinet can be absorbed without changing the, it is possible to adjust to have the desired acoustic characteristics according to the type of program to be viewed, the volume, etc. Yes, and especially
Since it can absorb sound waves in the low frequency range, even if the cabinet is made of a material with low rigidity, the sound waves in the low frequency range will not be amplified and the cabinet will not vibrate. There is an advantage that it can be prevented.

Further, in the television receiver of the present invention, the position and number of the sound wave absorption control devices to be installed in the cabinet are adjusted at the time of manufacture, and a pair of the sound wave absorption control devices is used at the time of use. By adjusting the applied voltage value applied to the electrodes, for example, it is possible to absorb sound waves of different frequencies for each sound wave absorption control device, and thus it is possible to change the sound wave absorption control sound range for each part in the cabinet. There is an advantage in that it is possible to give a specific sound wave absorption control performance to each of the necessary parts in the cabinet.

Further, the sound wave absorption control device is a low cost device using the ENC fluid composition, and as a result, the cost of the television receiver using such a sound wave absorption control device increases. It is possible to avoid In particular, when the solid particles (EA particles) are inorganic-organic composite particles formed by a core body made of an organic polymer compound and a surface layer made of an EA inorganic substance, a practical ENC having high storage stability. A fluid composition is obtained, and as a result, the reliability of the sound wave absorption control device is further improved,
It is easy to give desired acoustic characteristics to the television receiver.

[Brief description of drawings]

FIG. 1 is a graph showing the results of measuring the effect of electric field strength on EA characteristics in an EA particle dispersion system.

FIG. 2 is a diagram showing an equivalent circuit of a vibration system.

FIG. 3 is a plan view of the television receiver of the embodiment of the present invention when the inside is viewed from the top surface thereof.

4 is a cross-sectional view of the sound wave absorption control device of the television receiver shown in FIG.

FIG. 5 is a cross-sectional view showing an example of the ENC composition according to the present invention.

FIG. 6 is a cross-sectional view showing an aspect of the ENC composition according to the present invention when the power is turned off.

FIG. 7 is a cross-sectional view showing an aspect of the ENC composition according to the present invention when the power is turned on.

FIG. 8 is a cross-sectional view showing a state in which a sound wave is incident and one of the electrode plates vibrates in the sound wave absorption control device used in the present invention.

FIG. 9 is a cross-sectional view showing a state in which a chain and one electrode plate resonate when a sound wave is incident on the sound wave absorption control device used in the present invention.

FIG. 10 is a diagram showing another example of the bending state of the chain in the sound wave absorption control device used in the present invention.

FIG. 11 is a view showing a column in which a plurality of chains are joined to each other in the sound wave absorption control device used in the present invention.

FIG. 12 is a plan view of a television receiver of another embodiment of the present invention when the inside is seen from the top surface thereof.

FIG. 13 is a cross-sectional view showing another embodiment of the sound wave absorption control device used in the present invention.

FIG. 14 is a plan view of a television receiver of another embodiment of the present invention when the inside is seen from the top surface thereof.

FIG. 15 is a diagram for explaining a conventional television receiver with a built-in speaker.

FIG. 16 is a plan view of a conventional television receiver as viewed from the top surface thereof.

[Explanation of symbols]

3 ... Cabinet, 3a ... Front cabinet, 3
b ... back cabinet, 4 ... cathode ray tube, 5 ... speaker for high range, 6 ... speaker for middle and low range, 7 ...
Sound wave absorbing material, 8a ... Coil spring, 8b ... Dash pot, 9 ... Television receiver, 10 ... Sound wave absorbing control device, 10e ... Voltage adjusting knob, 11 ... Hollow panel 1
2 ... Electrode plate, 13 ... Electrode plate, 15 ... Electrosensitive fluid absorption control fluid composition (ENC fluid composition), 16 ...
Variable power supply, 17 ... Surface material, 18 ... Lining material, 19 ...
Seal member, 21 ... Electric field arranging particles (EA particles, solid particles, inorganic / organic composite particles), 22 ... Electrical insulating medium,
24 ... sound wave, 25 ... sound wave, 27 ... switch, 33 ...
Core body (organic polymer compound), 34 ... Particles (particles of electric field aligning inorganic material), 35 ... Surface layer, 36 ... Chain-like body (particle chain),
39 ... Column, 49 ... Television receiver, 50 ...
Sound wave absorption control device, 59 ... Television receiver.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuya Edamura 2-6-15 Shiba Park, Minato-ku, Tokyo Inside Fujikura Kasei Co., Ltd. (72) Inventor Hidenobu Anzai 1-5 Kiba, Koto-ku, Tokyo No. 1 Fujikura Co., Ltd. (72) Inventor Yasufumi Otsubo 9-21-1 Konakadai, Inage-ku, Chiba-shi, Chiba 206

Claims (5)

[Claims] 1. A television receiver in which a cathode ray tube is housed in a cabinet and a speaker is arranged in the cabinet, wherein a hollow panel having a pair of electrode plates on a front surface and a back surface is housed between the pair of electrode plates. And a fluid composition for electro-sensitive sound wave absorption control, which comprises solid particles having an electric field array effect in an electrically insulating medium, and a variable power source for applying a desired voltage between the pair of electrode plates. A television receiver characterized in that the sound wave absorption control device is arranged in the cabinet. 2. The television receiver according to claim 1, wherein a voltage adjusting knob is provided outside the cabinet, and the voltage adjusting knob is connected to a variable power source of the sound wave absorption control device. . 3. The sound wave absorption control device is directly attached to the inner surface of the cabinet, and at least the electrode plate on the surface of the sound wave absorption control device inside the cabinet is made of a material that is flexible against sound waves. The television receiver according to claim 1 or 2. 4. The sound wave absorption control device is arranged with a gap between the sound wave absorption control device and the inner surface of the cabinet, and both the front side electrode plate and the back side electrode plate of the sound wave absorption control device respond to sound waves. The television receiver according to claim 1, wherein the television receiver is made of a flexible material. 5. The television receiver according to claim 1, wherein a sound wave absorbing material is provided in the cabinet.