JP3288557B2 - Cathode ray tube with transparent electromagnetic wave shielding film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube having a transparent electromagnetic wave shielding film formed by forming a thin conductive film on the surface of a face panel to prevent leakage of generated electromagnetic waves.

[0002]

2. Description of the Related Art At present, a cathode ray tube constituting a TV cathode ray tube or a display of a computer displays characters and images by projecting an electron beam from an electron gun onto a phosphor screen emitting red, green and blue light. It is to let.
Since the cathode ray tube emits an electron beam at a high voltage, an electromagnetic wave is radiated, which may adversely affect a human body and peripheral devices. Also, when the electron beam strikes the phosphor, static electricity is generated on the display surface.

In order to solve these problems, conventionally, a face plate in which a transparent conductive oxide film such as indium oxide is formed by a sputtering method, a vapor deposition method or the like is attached to the front surface of a display surface to shield electromagnetic waves. Or, a transparent conductive film is formed by coating a dispersion of the antimony-doped tin oxide and a silica sol-based binder on the display surface, thereby preventing the display surface from being charged, and further increasing the image contrast. For this reason, a coloring agent such as a dye is contained in an antistatic coating solution to prevent static and improve contrast. As a method for forming a conductive film having high conductivity on the surface of the face panel of a cathode ray tube, a method in which the face panel is put into an evaporation vessel and an indium oxide compound or a tin oxide compound is formed on the surface by evaporation (PVD method); In addition, a method (CVD method) of forming a conductive film on a panel surface by thermally decomposing an organic compound of indium or tin, a salt solution, or the like is known. As described above, at present, it is widely practiced to form a transparent conductive film on the surface of a cathode ray tube so as to have conductivity while ensuring its transparency.

[0004]

The conventional transparent conductive film exhibits sufficient conductive properties if it is used as an antistatic film. However, when it is coated on the display surface of a cathode ray tube, the transparency deteriorates, and It was insufficient for use in applications such as films and electromagnetic wave shielding films. In addition, the PVD method or CV
In the method D, the obtained transparent conductive film has good transparency and conductivity, but requires vacuum treatment or high-temperature treatment for film formation, resulting in large capital investment and high manufacturing cost. There was a problem.

Although the formation of a conductive film by a coating method has advantages such as low cost and no need for skilled techniques, it requires high-temperature treatment or limits the materials that can be used as a substrate. And other problems.
The same problem occurs in a multilayer film such as an antireflection film having a transparent conductive film on a substrate.

An object of the present invention is to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a cathode ray with a transparent electromagnetic wave shielding film which can be manufactured at low cost, has high transparency, and has excellent electromagnetic wave shielding properties. To provide tubes.

[0007]

The cathode ray tube with a transparent electromagnetic wave shielding film according to claim 1, which is specifically configured to solve the problems in the present invention, comprises silver fine particles having an average particle diameter of 0.05 μm or less and visible light. Particle size that is transparent in the wavelength region of light
A transparent electromagnetic wave shielding film containing inorganic fine particles of 0.1 μm or less, wherein the mixing ratio of the silver fine particles to the transparent conductive film is 10% by weight or more, and the volume resistivity value is 10 ³ Ω · cm or less. It is characterized by being provided above.

According to a second aspect of the present invention, there is provided a cathode ray tube with a transparent electromagnetic wave shielding film, wherein the transparent electromagnetic wave shielding film has a silver colloid having an average particle diameter of 0.05 μm or less and has transparency in a visible light wavelength region. It is formed by applying a paint containing at least inorganic fine particles having a particle size of 0.1 μm or less.

According to a third aspect of the present invention, in the cathode ray tube with the transparent electromagnetic wave shielding film, a coating having a lower refractive index than the transparent electromagnetic wave shielding film is coated on the transparent electromagnetic wave shielding film. I do.

[0010]

[0011]

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The present inventors have proposed that the metal fine particles to be uniformly dispersed on the face panel surface of the cathode ray tube include gold,
It is effective to contain metals such as silver, copper, nickel, etc., especially silver, and to uniformly disperse them on the face panel surface of the cathode ray tube, apply a paint in which metal fine particles are colloidally mixed. Makes it easy to manufacture, and a desired transparent electromagnetic wave shielding film (hereinafter, referred to as a transparent conductive film) is obtained on the face panel surface by the applied paint, and has a face panel surface covered with such a transparent conductive film. It has been found that a cathode ray tube can effectively solve the problem of the present invention. In this case, the transparent conductive film covering the surface of the face panel of the cathode ray tube has transparency in the visible light wavelength region (400 to 700 nm) and a particle size of 0.1 μm.
By adding inorganic fine particles having a particle size of m or less, a highly transparent face panel surface having high conductivity, not only preventing electrostatic charging but also shielding electromagnetic waves harmful to the human body can be obtained. In addition, the surface of the face panel covered with the transparent conductive film is further coated with a low-refractive-index film to form a multilayer, so that the antireflection function can be effectively provided and the strength of the transparent conductive film can be improved. It is valid.

Hereinafter, the case where silver fine particles are used as the metal fine particles and silver colloid is used as the metal colloid to be mixed into the paint will be specifically described. The particle size of the silver colloid is 0.05 μm or less from the viewpoint of transparency and conductivity.
Also, the compounding amount in the transparent conductive film is 10% or more by weight. When the particle size of the silver colloid exceeds 0.05 μm, the absorption by the silver colloid becomes too large, so that a transparent conductive film having practical transparency cannot be obtained. Also,
10% by weight of silver colloid in the transparent conductive film
When the amount is smaller, there is a problem that the conductivity is not improved by adding the silver colloid.

The transparent conductive paint containing silver colloid applied to the face panel surface of the cathode ray tube includes, for example, silver, colloid, silicon, aluminum, zirconium, cerium, titanium as transparent material in the visible light wavelength region. , Oxides selected from yttrium, zinc, magnesium, indium, tin, antimony, gallium, etc.,
A composite oxide or a nitride, particularly a coating material to which transparent conductive fine particles mainly containing indium, tin, or the like are added is used. Further, oxides, composite oxides added to the paint,
Alternatively, the particle size of the fine particles such as nitrides should be 0.1 μm or less from the viewpoint of transparency.
Colorants such as pigments and dyes can be added to the transparent conductive paint containing such a silver colloid in order to adjust the transmission color and the reflection color.

The transparent conductive film formed on the face panel surface of the cathode ray tube can be easily formed by applying the transparent conductive paint to the face panel surface. The thickness of the transparent conductive film to be formed is desirably 1 μm or less in order to ensure transparency, and further, the thickness of the transparent conductive film in the cathode ray tube having the transparent conductive film and a film having a low refractive index formed thereon. Is preferably 0.2 μm or less in order to provide an optical antireflection function. It is preferable to design the coating composition and application conditions in consideration of desired conductivity and transparency. The transparency of the transparent conductive film is effectively achieved by adding and using extremely fine colloidal silver particles and fine particles transparent to visible light. Coating methods include spin coating, roll coating, spraying,
Conventional film forming methods such as a bar coating method, a dip method, and a meniscus coating method can be used.

The conductive performance necessary for exhibiting the electromagnetic wave leakage prevention performance in addition to the electrostatic antistatic performance of the transparent conductive film is generally expressed by the relational expression between the electromagnetic wave shielding effect and the volume resistivity of the conductive film.

[0017]

(Equation 1) Here, S (dB); electromagnetic wave shielding effect ρ (Ω · cm); volume resistivity of conductive film f (MHz); electromagnetic wave frequency t (cm); When a transparent conductive film is formed with the transparent conductive paint of the present invention, the film thickness is 1 μm (1 μm) from the viewpoint of transmittance.
(× 10 ⁻⁴ cm) or less (1)
ceremony

[0018]

(Equation 2) Becomes As the value of S increases, the electromagnetic wave shielding effect increases, and when S> 30 dB, it is considered that the electromagnetic wave shielding effect is obtained.

The frequency of the electromagnetic wave to be regulated is 1
Since the range of 0 KHz to 1000 MHz is generally used, the conductivity of the transparent conductive film needs to have a volume resistivity of 10 ³ Ω · cm or less. That is, the lower the volume resistivity of the transparent conductive film, the more effectively it is possible to effectively shield electromagnetic waves of a wider range of frequencies.

By setting the blending ratio of the silver colloid in the transparent conductive film to 10% or more by weight, the volume resistivity of the transparent conductive film can be satisfied, so that the transparent conductive paint of the present invention is used. This makes it possible to form a transparent conductive film having an excellent effect of preventing electromagnetic wave leakage in addition to an effect of preventing electrostatic charge.

By adding inorganic fine particles having a transparency in the visible light wavelength region (400 to 700 nm) and a particle size of 0.1 μm or less to the above-mentioned transparent conductive paint, a highly transparent conductive paint is obtained. Is obtained. In this case, the blending ratio between the silver colloid and the inorganic fine particles needs to be blended in consideration of the transmittance and conductivity required for the transparent conductive film. Normally,
Ag: inorganic oxide = 70: 30 to 10:90 by weight in the transparent conductive film is a practical range.

The transparency of the transparent conductive film formed from such a transparent conductive coating material is such that, in addition to an extremely fine silver colloid having a particle size of 0.05 μm or less, a transparent particle size of 0.1 μm
It can be effectively improved by adding the following inorganic fine particles, and the conductivity can be improved effectively by blending silver colloid in the transparent conductive film in a weight ratio of 10% by weight or more. Can be achieved.

There is no particular limitation on the method for producing the transparent conductive coating used in the present invention. However, a liquid obtained by mixing a silver colloid and inorganic fine particles may be mixed with a binder component or various kinds of materials according to the purpose. It is possible to add a colorant and form a dispersion paint using a usual disperser such as an ultrasonic disperser or a sand mill. In the transparent conductive film of the present invention, by the above-described method, the surface of the cathode ray tube face panel is provided with an antistatic function, an electromagnetic wave shielding function, and an infrared ray shielding function on the surface of the cathode ray tube face at a lower cost than before, with excellent transparency. Can be granted.

In addition, by forming a film having a lower refractive index than the film on the transparent conductive film, in an image display such as a cathode ray tube, the resolution of a fluorescent lamp or the like can be reduced without impairing the resolution. It is also possible to provide an anti-reflection function for suppressing reflection of light. Generally, the optical antireflection performance of a thin film is determined by the refractive index and the thickness of the film constituting the film, and furthermore, in the case of a multilayer film, the number of laminated films.
In a multilayer film having an anti-reflection function, the wavelength for anti-reflection is set to λ, and in the two-layer anti-reflection film, the optical layers λ / 4 and λ /
In an antireflection film having a film configuration of 4, or λ / 2 and λ / 4, or a three-layer antireflection film, the medium refractive index layer, the high refractive index layer, and the low refractive index layer are formed from the substrate side with an optical thickness of λ / 4 and Film configurations of λ / 2 and λ / 4 are known.

In the multilayer film having the transparent conductive film, the material constituting the low refractive index film formed on the transparent conductive film is M (OR) _m R from the viewpoint of the film strength and the control of the refractive index. _n [M = Si, Ti, Zr. m + n = 4
m = 1-4] [R = C ₁ -C ₄ alkyl group n = 1
To 3] or a mixture of partial hydrolysates alone or in combination.

The outer surface of the low-refractive-index film is made of a material similar to the material constituting the low-refractive-index film and has a three-layer structure in which evenly distributed projections are provided. An antiglare effect for preventing obscuration can be provided.

By forming the above-described transparent conductive film or a multilayer film in which a low refractive index film is formed on the transparent conductive film on the surface of the cathode ray tube, an antistatic function and an electromagnetic wave shielding function can be easily achieved. Excellent functions such as a function, an antireflection function, an antiglare function, and high transparency can be provided, and a cathode ray tube having excellent visibility and having a display surface effective for protecting the human body can be realized.

Hereinafter, embodiments will be described.

Example Preparation of silver colloid Sodium citrate dihydrate 14 g, ferrous sulfate
While maintaining 60 g of a solution in which 7.5 g is dissolved at 5 ° C,
25 g of a solution of 2.5 g of silver nitrate was added to form a silver colloid. The formed silver colloid was washed with water by centrifugation to remove impurities, and then 52.5 g of pure water was added to prepare a silver colloid for paint. The particle size of the obtained silver colloid was 0.005 to 0.03 μm.

Preparation of Low Refractive Index Paint (Solution A) 0.8 g of tetraethoxysilane and 0.8 g of 0.1.
1N hydrochloric acid and 98.4 g of ethyl alcohol were mixed to form a uniform solution. (Solution B) 0.8 g of titanium isoptoxide and 0.8 g
Was mixed with 98.4 g of ethyl alcohol to obtain a uniform solution. 90 g of Solution A and 10 g of Solution B were mixed to prepare a low refractive index paint.

Film evaluation method-Surface resistance value: Loresta AP (4 manufactured by Mitsubishi Yuka Co., Ltd.)
・ Haze: Automatic Haze manufactured by Tokyo Denshoku Co., Ltd.
The haze of the film itself is measured by Meter H III DP.-Luminous reflectance: The luminous reflectance of the film at 400 to 700 nm is measured by GAMMA spectral reflection spectrum.-Transmittance: U-Best50 manufactured by JASCO Corporation.
Measure the transmittance of the film itself at 550 nm by using the following methods:-Scratch resistance: 1 mm under a load of 2 kg with poppy rubber
After reciprocating 0 times, the degree of damage on the film surface was visually evaluated. ○; no scratches △; slight scratches ×; many scratches ・ Pencil hardness: After scanning the film surface with a pencil under a load of 1 kg, the hardness of the pencil at which scratches begin to occur on the film surface visually is determined as the pencil hardness of the film.

(Example 1) [Preparation of Transparent Conductive Paint] Silver colloid liquid 16.7 g Antimony-doped tin oxide fine powder 1.5 g (Sumitomo Osaka Cement Co., Ltd., particle size: 0.01 μm) Pure water 61.8 g IPA 10.0 g butyl cellosolve 10.0 g was blended and dispersed with an ultrasonic disperser (Central Kagaku Trading Co., Ltd .; Sonifier 450) to prepare a transparent conductive paint. [Film formation] The above-mentioned transparent conductive paint was applied to the surface of a CRT panel using a spin coater under the conditions of 150 rpm-30 seconds, and after drying, the low-refractive-index paint adjusted as above was similarly applied using a spin coater at 150 rpm-30 seconds. Then, a transparent conductive film was formed by baking at 150 ° C. for 1 hour using a drier to form a cathode ray tube having an antireflection / highly conductive film having a thickness of about 200 nm on the panel surface.
Table 1 shows the evaluation results.

(Example 2) [Preparation of transparent conductive paint] Silver colloid liquid 23.3 g Antimony-doped tin oxide fine powder 1.3 g (Sumitomo Osaka Cement Co., Ltd., particle size 0.01 μm) Pure water 55.4 g IPA 10.0 g butyl cellosolve 10.0 g was blended and dispersed with an ultrasonic disperser (Central Kagaku Trading Co., Ltd .; Sonifier 450) to prepare a transparent conductive paint. [Film formation] The above-mentioned transparent conductive paint was applied to the surface of a CRT panel using a spin coater under the conditions of 150 rpm-30 seconds, and after drying, the low-refractive-index paint adjusted as above was similarly applied using a spin coater at 150 rpm-30 seconds. Then, a transparent conductive film was formed by baking at 150 ° C. for 1 hour using a drier to form a cathode ray tube having an antireflection / highly conductive film having a thickness of about 200 nm on the panel surface.
Table 1 shows the evaluation results.

(Example 3) [Preparation of transparent conductive paint] Silver colloid liquid 16.7 g Tin-doped indium oxide fine powder 1.5 g (Sumitomo Osaka Cement Co., Ltd. particle size: 0.01 μm) Pure water 61.8 g IPA 10 Then, 10.0 g of butyl cellosolve was mixed and dispersed with an ultrasonic disperser (manufactured by Central Science Trading Co .; Sonifire 450) to prepare a transparent conductive paint. [Film formation] The above transparent conductive paint was applied to the surface of a cathode ray tube using a spin coater at 150 rpm for 30 seconds.
After drying, the low-refractive-index paint was applied by a spin coater under the same conditions at 150 rpm for 30 seconds.
C. for 1 hour to form a transparent conductive film, thereby producing a cathode ray tube having an anti-reflection and high conductive film having a thickness of about 200 nm on the panel surface. Table 1 shows the evaluation results.
It was shown to.

(Example 4) [Preparation of transparent conductive paint] Silver colloid liquid 23.3 g Tin-doped indium oxide fine powder 1.3 g (0.01 μm particle size, manufactured by Sumitomo Osaka Cement Co.) 55.4 g IPA 10 Then, 10.0 g of butyl cellosolve was mixed and dispersed with an ultrasonic disperser (manufactured by Central Science Trading Co .; Sonifire 450) to prepare a transparent conductive paint. [Film formation] The above transparent conductive paint was applied to the surface of a cathode ray tube using a spin coater at 150 rpm for 30 seconds.
After drying, the low-refractive-index paint was applied by a spin coater under the same conditions at 150 rpm for 30 seconds.
C. for 1 hour to form a transparent conductive film, thereby producing a cathode ray tube having an antireflection and high conductive film having a thickness of about 200 nm on the panel surface. Table 1 shows the evaluation results.

(Example 5) [Preparation of transparent conductive paint] Silver colloid liquid 33.3 g Antimony-doped tin oxide fine powder 1.0 g (Sumitomo Osaka Cement Co., Ltd., particle size 0.01 μm) Pure water 45.7 g IPA 10.0 g butyl cellosolve 10.0 g was blended and dispersed with an ultrasonic disperser (Central Kagaku Trading Co., Ltd .; Sonifier 450) to prepare a transparent conductive paint. [Film formation] The above-mentioned transparent conductive paint was applied to the surface of a CRT panel using a spin coater under the conditions of 150 rpm-30 seconds, and after drying, the low-refractive-index paint adjusted as above was similarly applied using a spin coater at 150 rpm-30 seconds. Then, a transparent conductive film was formed by baking at 150 ° C. for 1 hour using a drier to form a cathode ray tube having an antireflection / highly conductive film having a thickness of about 200 nm on the panel surface.
Table 1 shows the evaluation results.

(Example 6) [Preparation of transparent conductive paint] Silver colloid solution 40.0 g Antimony-doped tin oxide fine powder 0.8 g (Sumitomo Osaka Cement Co., Ltd., particle size: 0.01 μm) Pure water 39.2 g IPA 10.0 g butyl cellosolve 10.0 g was blended and dispersed with an ultrasonic disperser (Central Kagaku Trading Co., Ltd .; Sonifier 450) to prepare a transparent conductive paint. [Film formation] The above-mentioned transparent conductive paint was applied to the surface of a CRT panel using a spin coater under the conditions of 150 rpm-30 seconds, and after drying, the low-refractive-index paint adjusted as above was similarly applied using a spin coater at 150 rpm-30 seconds. Then, a transparent conductive film was formed by baking at 150 ° C. for 1 hour using a drier to form a cathode ray tube having an antireflection / highly conductive film having a thickness of about 200 nm on the panel surface.
Table 1 shows the evaluation results.

Comparative Example 1 [Preparation of Transparent Conductive Paint] Antimony-doped tin oxide fine powder 2.0 g (0.01 μm particle size, manufactured by Sumitomo Osaka Cement Co., Ltd.) Pure water 80.0 g IPA 10.0 g butyl cellosolve 0 g was blended and dispersed with an ultrasonic disperser (Central Kagaku Trading Co., Ltd .; Sonifier 450) to prepare a transparent conductive paint. [Film formation] The above-mentioned transparent conductive paint was applied to the surface of a CRT panel using a spin coater under the conditions of 150 rpm-30 seconds, and after drying, the low-refractive-index paint adjusted as above was similarly applied using a spin coater at 150 rpm-30 seconds. Then, a transparent conductive film was formed by baking at 150 ° C. for 1 hour using a drier to form a cathode ray tube having an antireflection / highly conductive film having a thickness of about 200 nm on the panel surface.
Table 1 shows the evaluation results.

Comparative Example 2 [Preparation of Transparent Conductive Paint] Tin-doped indium oxide fine powder 2.0 g (0.02 μm particle size, manufactured by Sumitomo Osaka Cement Co.) Pure water 80.0 g IPA 10.0 g Butyl cellosolve 10.0 g was mixed and dispersed with an ultrasonic disperser (manufactured by Central Kagaku Trading Co .; Sonifire 450) to prepare a transparent conductive paint. [Film formation] The above transparent conductive paint was applied to the surface of a cathode ray tube using a spin coater at 150 rpm for 30 seconds.
After drying, the low-refractive-index paint adjusted as described above is similarly applied using a spin coater at 150 rpm for 30 seconds, and baked at 150 ° C. for 1 hour in a drier to form a transparent conductive film. A cathode ray tube having an antireflection and high conductive film having a thickness of about 200 nm was prepared. Table 1 shows the evaluation results.

[Comparative Example 3] [Preparation of transparent conductive paint] 66.7 g of colloidal silver solution 13.3 g of pure water 10.0 g of IPA 10.0 g of butyl cellosolve were blended and mixed with an ultrasonic disperser (Central Science Trading Co., Ltd.) Manufactured by Sonicifier 450) to prepare a transparent conductive paint. [Film formation] The above transparent conductive paint was applied to the surface of a cathode ray tube using a spin coater at 150 rpm for 30 seconds.
After drying, the low-refractive-index paint adjusted as described above is similarly applied using a spin coater at 150 rpm for 30 seconds, and baked at 150 ° C. for 1 hour in a drier to form a transparent conductive film. A cathode ray tube having an antireflection and high conductive film having a thickness of about 200 nm was prepared. Table 1 shows the evaluation results.

Comparative Example 4 [Preparation of Ag Salt Solution] After dissolving 3.5 g of silver nitrate in 60 ml of pure water, ammonia water was added until the precipitate was redissolved. Then, 2.5 g of sodium hydroxide was added to the pure 60
After adding the solution dissolved in ml, ammonia water was added again until the precipitate was redissolved to prepare an Ag salt solution. [Preparation of reducing agent solution] 45 g of glucose and 4 g of tartaric acid were dissolved in 1000 ml of pure water, boiled for 10 minutes, cooled, and then added with 100 ml of ethanol to prepare a reducing agent solution. [Deposition] 50 ml of the Ag salt solution and 5 of the reducing agent solution
The mixed solution obtained by mixing 0 ml was immediately applied to the surface of a cathode ray tube using a spin coater at 150 rpm-30.
After coating under the condition of seconds and drying, the surface of the conductive film obtained by the pure water shower was washed. Next, the low-refractive-index paint adjusted as described above was similarly coated with a spin coater at 150 rpm.
A cathode ray tube having an anti-reflective and highly conductive film having a thickness of about 200 nm on the panel surface was prepared by applying the film under a condition of 30 seconds and baking it at 150 ° C. for 1 hour in a drier to form a transparent conductive film. Table 1 shows the evaluation results.

[0041]

[Table 1]

As described above, in the present invention, the cathode ray tube with the transparent electromagnetic wave shielding film according to the first aspect has an average particle diameter of 0.0
A silver fine particle having a particle size of 5 μm or less and an inorganic fine particle having a particle size of 0.1 μm or less having transparency in a visible light wavelength region; and the compounding ratio of the silver fine particle in the transparent conductive film is 10% by weight or more, By providing a transparent electromagnetic wave shielding film with a specific resistance value of 10 ³ Ωcm or less on the display screen, it has high transparency and excellent antistatic function, electromagnetic wave shielding function, and antireflection function. An inexpensive cathode ray tube can be realized. Then, by baking at a relatively low temperature during manufacturing, a transparent electromagnetic wave shielding film having a pencil hardness of 5H to 6H can be obtained, and a practically sufficient film strength can be secured.

Further, in the cathode ray tube with a transparent electromagnetic wave shielding film according to claim 2, the transparent electromagnetic wave shielding film has a silver colloid having an average particle diameter of 0.05 μm or less and has transparency in a visible light wavelength region. High transparency can be imparted by being formed by applying a coating material containing at least inorganic fine particles having a particle size of 0.1 μm or less.

Further, in the cathode ray tube with the transparent electromagnetic wave shielding film according to the third aspect, the transparent electromagnetic wave shielding film is coated with a film having a lower refractive index than the transparent electromagnetic wave shielding film, thereby preventing the cathode ray tube. A cathode ray tube having a high dazzling effect can be realized.

[0045]

[0046]

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/88 H01J 29/89

Claims (3)

(57) [Claims] (1) silver fine particles having an average particle size of 0.05 μm or less;
Particle size with transparency in the visible wavelength range of 0.1 μm or less
Inorganic fine particles of the silver fine particles to the transparent conductive film
The mixing ratio is 10% by weight or more and the volume resistivity value is 1%.
0 ³ Ω · cm or less transparent electromagnetic wave shielding film on the display screen
A cathode ray tube with a transparent electromagnetic wave shielding film, wherein the cathode ray tube is provided with: 2. The transparent electromagnetic wave shielding film has an average particle size.
Silver colloid of 0.05 μm or less and transparent to the wavelength region of visible light
Transparent electromagnetic wave shielding film-coated cathode ray tube according to claim 1, wherein the particle size is characterized by being formed by applying a coating material obtained by containing at least the following inorganic fine particles 0.1μm having Akirasei. 3. The transparent electromagnetic wave shielding film according to claim 1 , wherein
3. The cathode ray tube with a transparent electromagnetic wave shielding film according to claim 1, wherein a coating having a lower refractive index than the electromagnetic wave shielding film is coated .