KR101263054B1 - Electromagnetic wave shield filter - Google Patents

Abstract

This invention aims at providing the electromagnetic wave shield filter which has a blackening process surface which is sufficient in blackening degree even if it is used by the structure which shows wet color, and was excellent in the light reflection prevention effect. In the electromagnetic shielding filter which has at least one conductive mesh layer on a transparent base material, this invention WHEREIN: The surface of at least one or more of the front surface and the back surface of the said conductive mesh layer is blackened, and based on JISZ8722 of the said blackened process surface and a total light reflectivity (R _SCI) as measured up to 12%, and the electromagnetic wave shielding filter, characterized in that at least the non-(R _SCE / R _SCI) is 0.8 of the light reflectivity (R _SCE) for the total light reflectance (R _SCI) The above effects were solved.

Wet color, mesh layer, electromagnetic shielding filter, blackening layer, transparent resin layer

Description

Electromagnetic shielding filter {ELECTROMAGNETIC WAVE SHIELD FILTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shield filter having a light transmittance for shielding (shielding) electromagnetic waves generated from a display such as a CRT or a PDP.

In recent years, with the advancement and increasing use of the functions of electrical and electronic equipment, electromagnetic noise interference (Electro Magnetic Interference; EMI) has increased, and in displays such as cathode ray tubes (CRTs) and plasma display panels (PDPs), etc. Electromagnetic waves are generated. In order to shield this electromagnetic wave, the electromagnetic wave shield filter arrange | positioned at the front surface of a display is known. In the electromagnetic shielding filter used for such a purpose, the light transmittance is also required along with the electromagnetic shielding performance. Then, the electromagnetic wave shielding shield filter which formed the mesh layer provided with electroconductivity by the etching and metal plating of metal foil on this transparent base material using the transparent base materials, such as a resin film and a glass plate, is known.

As mentioned above, when a mesh layer is formed using copper foil, a copper plating layer, etc., the mesh layer reflects unnecessary light, such as external light, and the metallic luster which reflects reduces the clear room contrast of a perspective image. Therefore, normally, the said black mesh layer is made into the structure which coat | covers the surface with the blackening layer, and the blackening process surface with black external appearance is given, and the light reflection is prevented (patent document 1, patent document 2). In that case, since the blackening process surface has high blackening degree and the light reflection prevention performance improves, it is said that it is good to define the surface roughness. For example, in patent document 1, surface roughness Ra is prescribed | regulated to 0.10-1.00 micrometer. In addition, in patent document 2, arithmetic mean roughness Ra prescribed | regulated to JISB0601 is prescribed | regulated in the range of 0.02-1.00 micrometer.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-286594

Patent Document 2: Japanese Patent Laid-Open No. 2003-318596

The electromagnetic wave shield filter rarely has a structure in which the mesh layer is directly exposed to air, and in general, a transparent resin layer is often provided to cover the mesh layer in order to protect the mesh layer and add an optical filter function. Therefore, in the transparent resin layer side blackening process surface of a mesh layer, a transparent resin layer is laminated | stacked closely and it is a wet state as it said in the said transparent resin layer. For this reason, the blackening process surface shows an overview different from when it was exposed to air (it becomes color when the surface is wet by liquid, and is called "wet color"). In addition, the phenomenon seen by this wet color is the same also in the structure which laminated | stacked the mesh layer which makes the said transparent base material side the blackening process surface on the transparent base material.

Therefore, in the structure normally used, the appearance of the blackened surface is affected directly by this wet color, and the blackening degree of the blackened surface is sufficiently represented by only defining the arithmetic surface roughness Ra as in the prior art. There was no case.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electromagnetic wave shield filter having a blackening treatment surface which is sufficient in blackening degree even when used in a configuration showing wet color and excellent in light reflection prevention effect.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the electromagnetic wave shield filter which concerns on this invention is an electromagnetic wave shield filter which has a conductive mesh layer at least on a transparent base material WHEREIN: At least any one or more of the surface and the back surface of the said conductive mesh layer are blackened. The total light reflectance (R _SCI ) measured according to JIS Z8722 of the blackening treatment surface is 14% or less, and the ratio of the diffuse light reflectance (R _SCE ) to the total light reflectance (R _SCI ) (R _SCE / R _SCI ) is 0.8 or more.

When the electromagnetic wave shield filter which concerns on this invention is used in the structure which shows wet color by making ratio of the total reflectance and the diffuse reflectance with respect to total reflectance into the said specific range with respect to the blackening process surface of the blackening process conductive mesh layer In addition, the degree of blackening is sufficient, and it is possible to have a blackening process surface excellent in the light reflection prevention effect, and the visibility of a display image can be made favorable.

In the electromagnetic wave shield filter according to the present invention, when the blackening treatment surface has minute unevenness and a roughness curve is adopted as the contour curve of the unevenness, ten-point average roughness (RzJIS) of the roughness curve [JIS B0601 (1994 version) ]] Is 2 micrometers or more, and since it has sufficient blackening degree and can have a blackening process surface excellent in the light reflection prevention effect, and can improve visibility, it is mentioned as a preferable one aspect.

In the electromagnetic wave shield filter which concerns on this invention, the structure by which the transparent resin layer is laminated | stacked on the said blackening process surface of the conductive mesh layer which has the said blackening process surface may be sufficient. When it has such a structure, the blackening process surface under a transparent resin layer can be protected from corrosion, damage, etc. in the said transparent resin layer. In addition, although the blackening process surface of the mesh layer under a transparent resin layer becomes wet color by the contact of the said transparent resin layer, in this invention, since it is excellent in light reflection prevention also in the wetening blackening process surface. to be.

When the electromagnetic wave shield filter which concerns on this invention is used by the structure which shows wet color by making ratio of the total reflectance and the diffuse reflectance to total reflectance into the said specific range with respect to the blackening process surface of the blackening process conductive mesh layer Even if it has sufficient blackening degree, it can have a blackening process surface excellent in the light reflection prevention effect. As a result, according to the electromagnetic wave shield filter which concerns on this invention, reflection of light is reduced and it can improve the visibility of a display image by showing a feeling of contrast.

1 is a cross-sectional view showing an example of an electromagnetic wave shield filter according to the present invention.

2 is a cross-sectional view showing a combination example of a blackening treatment surface in a mesh layer of the electromagnetic wave shield filter according to the present invention.

Fig. 3A is a contour curve (roughness curve R), Fig. 3B is a probability density function ADF and a load curve BAC, and Fig. 3C is Fig. 3B. ) Is a graph showing a graph in which the probability density is rotated to be the upper plus in the vertical axis.

Fig. 4 shows a (probability density) curve Adc in which the probability density function ADF is smoothed, and an example of an upwardly convex curve shape suitable for the present invention is Fig.4A, and an example of a downwardly convex curve shape is Fig.4. (B).

[Description of Symbols]

1: transparent base material

2: mesh layer

21: mesh shape conductor layer

22: blackening layer

3: transparent resin layer

4: adherend

10: electromagnetic shield filter

ADF: Probability Density Function

Adc: Probability Density Curve

BAC: load curve

ML: Average line

R: roughness curve

Rp: Maximum mountain height (of roughness curve)

Rv: maximum song depth (of roughness curve)

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the electromagnetic wave shield filter which concerns on this invention is an electromagnetic wave shield filter which has a conductive mesh layer at least on a transparent base material WHEREIN: At least any one or more of the surface and the back surface of the said conductive mesh layer are blackened. The total light reflectance (R _SCI ) measured according to JIS Z8722 of the blackening treatment surface is 14% or less, and the ratio of the diffuse light reflectance (R _SCE ) to the total light reflectance (R _SCI ) (R _SCE / R _SCI ) is 0.8 or more.

The blackening process surface in this invention is provided in the side which an observer sees the said electromagnetic wave shield filter at least in the form which an electromagnetic wave shield filter uses for a display. In addition, the total light reflectance (R _SCI ) measured based on JIS Z8722 of the blackening process surface in this invention is a spectrophotometer (for example, the product made by Konica Minolta Sensing Co., Ltd., CM based on JIS Z8722). -3600d) is set to the reflection mode, and the light source uses the standard light D65, field of view 2 °, and the SCI (integrated) intensity of the total reflection light integrating both the diffuse reflection light and the specular reflection light of the reflected light. It is set to Specular Component Include) mode and it measures Y value (Y among 3 stimulus values XYZ). In addition, the diffuse light reflectance (R _SCE ) measured according to JIS Z8722 of the blackening process surface is similar to the above using the spectrophotometer, and the light source and the visual field are similar to the above, and the detector is used only for the diffuse reflected light of the reflected light (integrated). The Y value (Y of tristimulus values XYZ) is measured by setting to SCE (Special Component Exclude) mode.

The electromagnetic wave shield filter according to the present invention optimizes the blackened surface so as to have the specific reflection characteristics as described above, thereby making it appear blacker even in wet color, and do not emit black light, and thus see through external light reflection on the conductive mesh layer surface. The fall of the black level of an image can be prevented, and the black level can be improved. Therefore, when the electromagnetic wave shield filter which concerns on this invention is provided, display image visibility can be improved by showing the clear feeling of a contrast of a perspective image.

[Layer Composition]

First, Fig. 1 is a sectional view illustrating a basic form of an electromagnetic wave shield filter 10 according to the present invention.

FIG. 1A is a configuration in which a conductive mesh layer 2 (hereinafter simply abbreviated as "mesh layer") is laminated on the transparent base material 1. 1B is a structure in which the conductive mesh layer 2 is laminated on the transparent base material 1 and the transparent resin layer 3 is laminated on the conductive mesh layer 2. In addition, the adherend layer 4 may be laminated on the transparent resin layer 3 as shown in FIG. 1C, and the adherend layer 4 is disposed on the transparent substrate 1 side as shown in FIG. 1D. ) May be laminated. 1, the conductive mesh layer 2 consists of the mesh-shaped conductor layer 21 and the blackening layer 22, and the blackening process surface of the mesh layer is the blackening layer formed in the surface of the mesh-shaped conductor layer ( It is formed as the surface of 22). 1 is an explanatory view in the form in which the blackening process surface was formed in the surface (upper figure) and both side surfaces of the line part (line part) of the conductor mesh layer 2. As shown in FIG. The blackening treatment surface is provided on at least one of the front and back surfaces of the conductive mesh layer, and the combination of the treatment surfaces is various as described later in FIG. In addition, the said adherend layer 4 means that various optical filters, such as an antireflection filter and a near-infrared absorption filter of sheet form, plate shape, or coating film form, the component parts of a display itself, It is a layer which has arbitrary functions, such as a front surface substrate used.

Moreover, you may provide another layer suitably as an electromagnetic wave shield filter as needed. For example, when the conductive mesh layer is rusted, various layers or treatments in the conventionally known electromagnetic shield filter, such as coating with a rust preventive layer, may be added within a range not departing from the object and effect of the present invention. .

Here, in the present invention, the "surface side" and "surface" refer to the side where the conductive mesh layer is formed with respect to the transparent substrate as the "surface side" (also the side facing upward in the drawing) and the side where the conductive mesh layer is formed. The surface which becomes an orientation (it is also the upper surface of drawing) is called "surface." The "back side" and "back side" refer to the side (it is also the side which faces downward of drawing) to the surface (it is also the lower surface of drawing) opposite to the said "surface side" and "surface."

In addition, when applied to a display use etc., the observer side may be the back surface other than the surface defined by this invention.

The above example does not limit embodiment of the electromagnetic wave shield filter of this invention. Any thing which has a structure substantially the same as the technical idea described in the Claim of this invention, and exhibits the same effect is included in the technical scope of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the electromagnetic wave shield filter of this invention is demonstrated in order for every layer from a transparent base material.

[Transparent material]

The transparent base material 1 is a layer for reinforcing the copper mesh layer with weak mechanical strength. Therefore, if it has light transmittance with mechanical strength, after considering other heat resistance, insulation, etc. suitably, what is necessary is just to select and use according to a use. As a specific example of a transparent base material, it is a board which consists of organic materials, such as transparent resin, a sheet | seat and a sheet (a film.

As said transparent resin, For example, polyester-based resins, such as a polyethylene terephthalate, a polybutylene terephthalate, a polyethylene naphthalate, a terephthalic acid-isophthalic acid-ethylene glycol copolymer, a terephthalic acid-cyclohexane dimethanol-ethylene glycol copolymer, Polyamide resins such as nylon 6, polyolefin resins such as polypropylene and polymethylpentine, acrylic resins such as polymethyl methacrylate, styrene resins such as polystyrene and styrene-acrylonitrile copolymers, triacetyl cellulose, etc. Cellulose resin, imide resin, polycarbonate resin, and the like.

In addition, these resins are used alone or as a plurality of kinds of mixed resins (including polymer alloys) as the resin material, and are used as a single layer or a laminate of two or more layers. In the case of the resin sheet, uniaxially stretched or biaxially stretched stretched sheet is more preferable in view of mechanical strength.

Moreover, in these resin, you may add additives, such as a ultraviolet absorber, a filler, a plasticizer, an antistatic agent, suitably as needed.

Examples of the glass include quartz glass, borosilicate glass, soda-lime glass, and more preferably, the coefficient of thermal expansion is small, the dimensional stability and the workability in high temperature heat treatment are excellent, and the glass does not contain an alkali component. An alkali free glass etc. are mentioned, It can also be combined with the electrode substrate used as a front substrate of a display, etc.

In addition, the thickness of a transparent base material should just be according to a use, and there is no restriction | limiting in particular, When it consists of transparent resin, although it is about 12-1000 micrometers normally, Preferably it is 50-500 micrometers. On the other hand, when a transparent base material is a glass plate, about 1-5 mm is suitable normally. In any material, when the thickness is less than the above, the mechanical strength is insufficient, so that warpage, loosening, breakage, or the like occurs. When the thickness exceeds the above-mentioned thickness, the cost increases due to excess performance, and the thickness becomes difficult.

In addition, although the transparent base material may combine with the front substrate which is one component of a display main body, in the aspect which uses an electromagnetic shield filter as a front filter arrange | positioned in front of a front substrate, in terms of thickness and weight, it is preferable than a board | substrate. The resin sheet is superior to the glass plate in that the sheet is excellent and not broken.

In this regard, the resin sheet is a preferred material as the transparent base material, but among the resin sheets, polyester resin sheets such as polyethylene terephthalate and polyethylene naphthalate are particularly preferable in terms of transparency, heat resistance, cost, and the like. Preferably, a biaxially stretched polyethylene terephthalate sheet is optimal. Moreover, although the transparency of a transparent base material is so good that it is high, it is preferable that the light transmittance which becomes 80% or more in visible light transmittance is preferable.

In addition, the transparent base material, such as a resin sheet, is suitably known on the surface, such as corona discharge treatment, a plasma treatment, an ozone treatment, a frame treatment, a primer treatment, a preheating process, a dust removal process, a vapor deposition process, and an alkali treatment. You may perform an adhesion process.

In addition, the transparent substrate may be colored with a dye or the like. By coloring, near-infrared absorption, neon light absorption, color adjustment, external light reflection prevention, etc. can be aimed at. For example, what is necessary is just to add the conventionally well-known various pigment | dyes, such as a near-infrared absorber, a neon light absorber, a color adjustment dye, and a pigment | dye for external light reflection prevention, about the transparent base material of resin.

[Conductive Mesh Layer]

The conductive mesh layer 2 is a layer which plays an electromagnetic wave shielding function, and is itself a layer which makes an electromagnetic wave shielding performance and light transmittance compatible by providing an opening in the shape of opacity and a mesh shape itself. In the conductive mesh layer in the present invention, the total light reflectance (R _SCI ) measured at least one or more of the front and rear surfaces thereof as a blackening treatment surface by blackening treatment, and measured according to JIS Z8722 of the blackening treatment surface. to 14%, more preferably it is not more than 12%, not less than also the total light reflectance (R _SCI) diffused light reflectance (R _SCE) ratio (R _SCE / _SCI R) about 0.8. In the present invention, in order to impart the specific reflection characteristic to the blackening treatment surface, the blackening layer is usually blackened by the blackening treatment on the required surface of the conductive mesh-shaped conductor layer 21 formed of metal foil or the like serving as the main body of the conductive mesh layer. (22) is formed and the exposed surface of the said blackening layer is made into the blackening process surface. Moreover, since the mesh shape which is a characteristic characteristic of a mesh layer is maintained other than a blackening layer, you may provide other layers, such as an antirust layer mentioned later suitably, as a structural layer of a conductive mesh layer. In the form where an electromagnetic wave shield filter is used for a display, when another layer, such as the said rustproof layer, is formed in the outermost surface of the side where an observer sees the said electromagnetic wave shield filter, the said outermost surface layer turns into a blackening process surface, It is necessary to have certain reflective properties.

(Mesh shape conductor layer)

Although the mesh-shaped conductor layer 21 is typically formed by the etching of metal foil, even if it is other than this, it is significant in the electromagnetic wave shield performance. Therefore, in this invention, the material and formation method of a mesh-shaped conductor layer are not specifically limited, Various mesh-like conductor layers in the conventionally well-known light-transmitting electromagnetic wave shield filter can be employ | adopted suitably. For example, a mesh-like conductor layer is formed on a transparent substrate in the form of a mesh from the beginning using a printing method, a plating method, or the like, or at first, a conductor layer is formed on the entire surface by a plating method on an transparent substrate, and then etching is performed. It may be made into a mesh-shaped conductor layer by making into a mesh shape by this.

For example, when forming the mesh shape of a mesh-shaped conductor layer by etching, it can form by forming the opening part by patterning the metal layer laminated | stacked on the transparent base material by etching, and forming it in a mesh shape. In order to laminate a metal layer on a transparent substrate, a metal layer prepared as a metal foil is laminated on the transparent substrate with an adhesive, or one or two or more physical or chemical forming methods such as vapor deposition, sputtering, plating, etc. are used without using a laminate adhesive. It can also be laminated on a transparent substrate. Moreover, the mesh-shaped conductor layer by etching can also be made into the mesh-shaped conductor layer of a mesh shape by patterning the metal foil single member before lamination | stacking on a transparent base material by etching. The mesh-shaped conductor layer of this single layer member is laminated on a transparent substrate with an adhesive or the like. Among these, since the metal conductor layer with weak mechanical strength is easy to handle, excellent in productivity, and commercially available metal foil can be used, the metal foil is laminated on a transparent substrate with an adhesive and then etched. The mesh-shaped conductor layer which is processed into a mesh shape and becomes a form laminated | stacked through the adhesive agent on the transparent base material is typical. What is necessary is just to employ | adopt well-known adhesive agents, such as adhesive agent or adhesive (adhesive layer), as adhesive in this case.

The mesh-shaped conductor layer is not particularly limited as long as it is a substance having sufficient electrical conductivity to exhibit electromagnetic shielding performance. However, in general, the metal layer is preferable in terms of good conductivity, and the metal layer is deposited, plated, and metal foil laminate as described above. And the like can be formed. As a metal material of a metal layer or metal foil, gold, silver, copper, iron, nickel, chromium, etc. are mentioned, for example. The metal of the metal layer may be an alloy, or the metal layer may be a single layer or a multilayer. For example, in the case of iron, low carbon steel, such as a low carbon rim steel and a low carbon aluminum-kilted steel, Ni-Fe alloy, an Invar alloy, etc. are preferable. On the other hand, when a metal is copper, a metal material becomes copper and a copper alloy, and although copper foil includes a rolled copper foil and an electrolytic copper foil, in terms of thickness, its uniformity, adhesiveness with a blackening layer, electrolytic copper foil is desirable.

Moreover, the thickness of the mesh-shaped conductor layer by a metal layer is about 1-100 micrometers, Preferably it is 2-20 micrometers. If the thickness is too thin than this, sufficient electromagnetic shielding performance is difficult to be obtained due to the increase in the electrical resistance, and if the thickness is too thick, it is difficult to obtain a high-precision mesh shape, and the uniformity of the mesh shape is lowered.

Moreover, what is necessary is just to let the surface and back surface of the metal layer used as a mesh-shaped conductor layer pass through the said surface, when adhesiveness improvement with adjacent layers, such as a transparent adhesive bond layer for carrying out adhesive lamination | stacking, is necessary.

In addition, when the blackening layer is further formed on the surface of the metal layer serving as the mesh-shaped conductor layer, the surface roughness tends to be easy to have desired fine unevenness or low reflection characteristics even when the blackening layer is thinner. When the roughness curve is used as the contour curve of the surface of the metal layer serving as the mesh-shaped conductor layer, the ten point average roughness (RzJIS) (JIS B0601 (1994 version)) of the contour curve is preferably 1 µm or more.

(Blackening)

The blackening treatment is for preventing light reflection on the surface of the conductive mesh layer, and the blackening treatment surface formed by the blackening treatment prevents a decrease in the black level of the perspective image due to reflection of external light on the conductive mesh layer surface, thereby improving the black level. In addition, the visibility of the display image is improved by expressing a clear room contrast feeling of the perspective image. Although the blackening process surface is provided in all the surfaces of the line part (line part) of an electroconductive mesh layer, in this invention, at least any one or more of a surface and a back surface both surfaces shall be a blackening process surface. The electromagnetic wave shield filter which concerns on this invention is provided in the front surface of a display as a side which an observer sees the side which has the said blackening process surface.

In addition, the blackening process surface may be the surface itself of a single-layer conductive mesh layer. In other words, if the conductive mesh layer is a single layer, and the surface of the single layer has the above-mentioned specific reflection characteristic, the surface does not need additional blackening treatment. In the present invention, even if such a surface has the above-mentioned specific reflection characteristics, even if such additional blackening treatments result in the same surface properties, the shaving "blackening treatment surface" shall be included in the present invention.

However, from the viewpoint of the conductivity required for the electromagnetic wave shield function, a conductive layer such as a metal layer is employed as the conductive mesh layer, and the surface layer of such a conductor layer is usually metal or the like and is not black. It is not a blackening process surface in many cases. Therefore, in such a case, it is set as the structure which implemented the blackening process, such as forming the blackening layer mentioned later on the surface, and implementing the blackening process surface on the surface of the formed blackening layer. In addition, the provision of a blackening layer on the surface means that the layer (mesh-shaped conductor layer, etc.) constituting the surface is additionally provided by plating or the like, and the surface is formed from the surface toward the inside by etching or the like. The layer itself may be changed to a blackening layer. Therefore, normally, the conductor mesh layer 2 is a layer in which the blackening layer 22 is provided in the mesh-shaped conductor layer 21 which plays the electromagnetic wave shield function by electroconductivity, and at least one or more of its surface and back surface. (See Fig. 2).

Therefore, when the target surface of the blackening process surface which has the specific reflective characteristic which concerns on the said invention is illustrated as the formation surface of the blackening layer 22, the surface and the back surface both sides of the line part of the conductive mesh layer 2 (FIG. 2 (A) )], Only the surface [Fig. 2 (B)], only the back side [Fig. 2 (C)], only the front and the side (both sides or one side), only the back and the side (both sides or one side), the entire surface ( Both the front and back surfaces and both sides) (FIG. 2D). However, this is shown for the blackening treatment surface having the specific reflection characteristic, and in addition to the blackening treatment surface shown above, even if it has a blackening treatment surface which generally falls into the category of blackening treatment surface but does not have the desired reflection characteristic. good. For example, although the whole surface normally falls into the category of the blackened surface, only the surface is a blackened surface which has the desired reflective characteristic prescribed | regulated by this invention.

(Blackened surface)

The blackening process surface of the electroconductive mesh layer in this invention shows the color (brown, navy blue, deep green, etc., including black) which is black or near black, and the total light reflectance measured based on JISZ8722. (R _SCI) is 14% or less, preferably 12% or less, and the total light reflectance (R _SCI) diffused light reflectance ratio (R _SCE / R _SCI) is 0.8 or more of the optical properties of (R _SCE) for Have

By optimizing the blackened surface so as to have the specific reflection characteristics as described above, the black color of the wetted color appears blacker and does not appear to be black light, and the lowering of the black level of the perspective image due to reflection of external light on the conductive mesh layer surface is prevented. Its black level can be improved. These can be achieved even in the wet color in which the transparent resin layer is further laminated on the blackening treatment surface, and when the electromagnetic wave shield filter according to the present invention is provided, the visibility of the display image can be improved by showing a feeling of clear room contrast of the perspective image.

Although the said total light reflectance of the blackening process surface in this invention is 14% or less, Preferably it is 12% or less, More preferably, it is 8% or less. The lower the total reflectance, the more preferable it is to be able to look blacker in wet color. Since the technical difficulty is difficult to achieve, the total reflectance of the blackened surface is usually 0.1% or more.

The ratio (R _SCE / R _SCI ) of the diffuse light reflectance R _SCE to the total light reflectance R _SCI of the blackened surface according to the present invention is 0.8 or more, but preferably 0.9 or more, more preferably. Is not less than 0.95. The total light reflectance (R _SCI) ratio (R _SCE / R _SCI) of the diffusion light reflectance (R _SCE) for a is closer to 1 is more components of the diffuse reflection of the total reflection, the component of the specular reflection that is less In this regard, the black level can be improved without showing so-called black light.

In order to make the reflection characteristic of the blackening process surface concerning this invention into the said specific reflection characteristic, it is preferable to adjust the conditions of blackening process suitably, and to adjust the color of blackening and the shape of micro unevenness | corrugation.

As an aspect for making the reflection characteristic of the blackening process surface which concerns on this invention into the said specific reflection characteristic, it is preferable that the shape of a blackening process surface has a fine unevenness | corrugation in the point which increases a diffuse reflection component. The said specific reflection characteristic depends on the various characteristics of the micro unevenness | corrugation of a blackening process surface.

Among the fine concavo-convexities, one form of a preferable shape for obtaining the specific reflection characteristic is a ten point average roughness (RzJIS) [JIS B0601 (1994) of the contour curve when a roughness curve is employed as the contour curve of the surface of the blackening treatment surface. Year plate)] is preferably 1 µm or more and 2 µm or more. Here, as the contour curve of the blackening process surface, although there exist a cross section curve, a roughness curve, and a wrinkle curve, in this invention, the roughness curve R which removed the wrinkle curve from the cross section curve is employ | adopted. As described above, when the blackened surface has a ten-point average roughness (RzJIS) (JIS B0601 (1994 version)) of the contour curve, it is likely to have the specific reflection characteristic. Ten point average roughness (RzJIS) (JIS B0601 (1994 version)) of the said contour curve becomes like this. More preferably, it is 2-5 micrometers. In addition, from the viewpoint of securing the strength of the conductive mesh layer and the electromagnetic shielding property, the value of RzJIS is preferably set to a value of about half or less of the thickness of the conductive mesh layer.

Moreover, as a form of the preferable shape for obtaining the said specific reflection characteristic among the said fine unevenness | corrugations, the probability density function of the said contour curve when a roughness curve is employ | adopted as the contour curve of a fine unevenness [JIS B0601 (2001 edition) prescription] In the shape near the peak of the probability density is a curve smoothing the probability density function, when the probability density is taken along the vertical axis and taken upward (the horizontal axis is the amplitude value of the unevenness of the roughness curve). The case where it becomes a shape is mentioned, for example. The term "above" of the convex upward is above when the probability density is taken on the vertical axis and the upward direction is taken as a positive value of the probability density.

Referring to Fig. 3, Fig. 3A shows a roughness curve R as a contour curve, and reference numeral ML is an average line in the figure. In addition, as a contour curve, although there exist a cross section curve, a roughness curve, and a wrinkle curve, the roughness curve R which subtracted the wrinkle curve from the cross section curve is employ | adopted by this invention. 3B is the probability density function ADF of the roughness curve and the load curve BAC of the roughness curve (cumulative curve) calculated from the contour curve of the roughness curve R of FIG. )to be. In the figure, Rp represents the maximum mountain height of the roughness curve, and Rv represents the maximum valley depth of the roughness curve. 3C is a graph in which FIG. 3B is rotated 90 degrees counterclockwise so that the probability density becomes the vertical axis in the upper direction of the figure. In Fig. 3C, the vertical axis of the probability density between Rp and Rv on the horizontal axis is a real scale and not a logarithmic scale. Since the shape represented by the probability density function ADF is a finely convex shape as shown in FIG. 3C, the smooth density curve of this is a probability density curve Adc as shown in FIG. Since the probability density function (ADF) obtained by measuring the surface becomes a jagged graph like a bar graph as shown in Figs. 3B and 3C, it is obtained as a smooth probability density curve by the least square method. Then, the characteristic of the minute unevenness | corrugation of a measurement surface is grasped | ascertained. In addition, smooth curve of the probability density function means that if the measurement of the surface is repeated an infinite number of times, the jagged graph is averaged, and finally, the probability density function is close to the smooth curve, and the final curve is once To approximately obtained from the result of a small number of measurements. Then, as in the probability density curve Adc shown in Fig. 4A, the blackening treatment surface in which the shape near the peak of the probability density curve becomes a convex upward shape has the same peak as in Fig. 4B. Better anti-reflection than blackening treatment surface in which the shape of the point is sharp and the curve located left and right with respect to the straight line parallel to the longitudinal axis passing through the peak of the peak is convex downward. Give performance.

The curve shape of the probability density function as mentioned above is obtained in most cases, for example, when the said minute unevenness | corrugation superimposed fine unevenness | corrugation on rough roughness.

In order to make the micro unevenness | corrugation of a blackening process surface into the specific micro unevenness | corrugation mentioned above, the subject surface to which blackening process conditions at the time of forming a blackening layer as mentioned later is adjusted suitably, or blackening process, ie, a blackening process surface Fine unevenness of the surface of the bottom surface of the surface is adjusted. In addition, it is easy to have desired micro unevenness and reflection characteristics, even if it is thinner when the base surface has a fine uneven surface rather than a mirror surface, and is thinner when forming a blackening layer further. The shape preferable as micro unevenness | corrugation of a base surface is as having described above. Preferable conditions of the blackening process at the time of forming a blackening layer are mentioned later.

Moreover, the preferable black density | concentration of the said blackening process surface is 0.6 or more. In addition, the measurement method of black density was set to density standard ANSIT as 10 degree of observation viewing angle, observation light source D50, illumination type using GRETAG SPM100-11 (made by Kimoto company, brand name) of COLOR CONTROL SYSTEM, and after white calibration Measure the specimen.

(Black layer)

The blackening layer 22 is a layer which is provided in order to provide the above-mentioned blackening process surface, and may be black, such as black, and should satisfy | fill basic physical properties, such as adhesiveness, and a well-known blackening layer can be employ | adopted suitably.

Therefore, as the blackening layer, an inorganic material such as metal, an organic material such as black colored resin, or the like can be used. For example, the inorganic material may be a metal-based layer such as a metal compound of a metal, an alloy, a metal oxide, or a metal sulfide. Form. As a method of forming a metal layer, conventionally well-known various blackening processes can be employ | adopted suitably. Especially, blackening process by a plating method is preferable at adhesiveness, uniformity, ease, etc. As the material of the plating method, for example, metals such as copper, cobalt, nickel, zinc, molybdenum, tin, chromium, metal compounds, and the like are used. These are superior to the case of cadmium or the like in terms of adhesiveness and black color.

In the case where the mesh-shaped conductor layer is made of copper such as copper foil, the plating method preferable as the blackening treatment for the blackening layer formation includes a mesh-shaped conductor layer made of copper (the conductor layer before it is performed before the mesh shape), In the electrolyte solution which consists of sulfuric acid, copper sulfate, cobalt sulfate, etc., there exists a cathode electrodeposition plating method which attaches cationic particle by carrying out cathodic electrolytic treatment. According to this method, black and coarse shaving can be obtained by adhesion of the cationic particles. As the cationic particles, copper particles and copper alloy particles can be employed. As a copper alloy particle, copper-cobalt alloy particle is preferable, and the average particle diameter is 0.001-1 micrometer. The blackening layer which consists of a copper-cobalt alloy particle layer can be obtained with a copper-cobalt alloy particle. In the negative electrode electrodeposition method, the average particle diameter of the cationic particles to be adhered is also preferred in terms of being 0.001 to 1 µm. If the average particle diameter exceeds the above range, the density of the adhered particles decreases, resulting in a decrease in black color and uneven color, and the particle dropout (powder fall) easily occurs. On the other hand, black falls even if an average particle diameter is less than the said range. In addition, in the cathode electrodeposition method, the treatment surface becomes a cathode and is activated by reducing hydrogen generation by performing the treatment at a high current density, and the adhesion between the copper surface and the cationic particles is remarkably improved.

Moreover, black chromium, black nickel, a nickel alloy etc. are also preferable as a blackening layer, As said nickel alloy, it is a nickel zinc alloy, a nickel- tin alloy, and a nickel- tin-copper alloy. In particular, the nickel alloy has good blackness and conductivity, and can also impart a rust prevention function to the blackening layer (it becomes a blackening layer and an rust preventing layer), and the rustproof layer can be omitted. In addition, since the particles of the blackening layer are generally needle-shaped, they are easily deformed due to external force and the appearance is easily changed.However, in the blackening layer made of nickel alloy, the particles are hardly deformed, so that the appearance is hardly changed in the post-processing process. Can be. In addition, as a blackening layer, the formation method of a nickel alloy may be a well-known electrolytic or electroless plating method, and may form a nickel alloy after performing nickel plating.

Alternatively, when the mesh-shaped conductor layer is copper, there is also a method of reacting this with an alkaline solution to oxidize it so as to reverse-precipitate copper oxide fine particles. For example, as described in Unexamined-Japanese-Patent No. 2002-9484, the method of immersing a copper mesh layer in the liquid mixture of the copper pyrolate aqueous solution, the potassium pyrolate aqueous solution, and the aqueous ammonia aqueous solution, etc. are mentioned.

In the present invention, in order for the blackened surface to have the above-mentioned reflection characteristic, the method for forming the blackened layer is appropriately selected according to the state of the surface of the mesh-shaped conductor layer. For example, when the roughness of the surface of the mesh-shaped conductor layer made of copper is relatively large and RzJIS is 1 µm or more, it is preferable to form a blackening layer by black nickel plating. In addition, when the surface roughness of the mesh-shaped conductor layer is relatively small and RzJIS is less than 1 µm, the anode electrodeposition method using copper particles or copper-cobalt alloy particles having an average particle diameter of about 1 nm to 1 µm or the average by alkaline solution It is preferable to form a blackening layer by copper oxide fine particle formation of about 1 nm of particle diameters.

(Mesh shape)

In addition, although the shape as a mesh shape of the mesh layer 2 is not specifically limited, A square is typical as a shape of the opening part of the mesh. The shape when viewed in the plane of the opening is, for example, a triangle such as an equilateral triangle, a square such as a square, a rectangle, a rhombus or a trapezoid, a polygon such as a hexagon, or a circle or an ellipse. The mesh has a plurality of openings formed in these shapes, and between the openings is usually a line-shaped line portion having a uniform width, and usually the opening portion and the line portion are the same shape and the same size on the whole surface. To illustrate the specific size, in view of the opening ratio and the invisibility of the mesh, the width of the line portion between the openings is preferably 5 to 25 µm. In addition, the opening size is [line spacing or line pitch]-[line width], but in this [line spacing or line pitch], it is 150 micrometers-500 micrometers, and an opening ratio (total area of opening part / total area of a mesh part) It is preferable to set it as 80 to 95% from the viewpoint of compatibility of light transmittance and electromagnetic wave shielding property.

In addition, the bias angle (the angle formed between the line portion of the mesh and the outer periphery of the electromagnetic shield filter) may be appropriately set to an angle at which moire is hard to occur in consideration of the pixel pitch of the display and the light emission characteristics.

The mesh layer 2 may be mesh-shaped over the entire surface of the electromagnetic shielding filter, but the portion where light transmittance is necessary is a mesh-shaped mesh portion, and other portions (for example, the entire four sides are frame-shaped). It may be a non-mesh part. The non-mesh portion is a portion other than the mesh portion, and becomes a region where light transmittance is not necessary. Usually, a non-mesh part is provided in the outer peripheral part of a mesh part. Also, the non-mesh portion is usually used to take ground. The non-mesh part used for grounding normally has a frame shape around all four sides. The frame-shaped non-mesh portion is also used as an external frame that enhances aesthetics by enclosing the image in a frame shape (for example, as a black frame or the like) with respect to an image viewed through a mesh portion such as a display image. It is available. In addition, when a non-mesh part takes a ground, it is preferable to expose a conductor layer in at least one part.

In addition, although the specific size of a non-mesh part is based on the method used, when it is set as a ground part or an external frame in a frame shape, the width of a frame is about 15-100 mm, and it is especially common to set it especially 30-40 mm.

(Rustproof floor)

As the mesh layer 2, you may form, or process another layer suitably as needed. For example, when the durability against rust is insufficient, a rustproof layer may be provided. Although the rustproof layer was also the blackening layer mentioned above, as long as it maintains the mesh shape which is the characteristic characteristic of the mesh layer, it is grasped | ascertained by this invention as a structural layer of the mesh layer contained in a mesh layer.

The rust-preventing layer may be applied to the rust-resistant surface of the mesh layer surface. However, when the rust-preventing layer is also applied on the blackening treatment surface, even after the blackening treatment surface (actually, the rust-preventing layer surface) after being carried out, the surface and the back surface of both surfaces are At least one surface is a surface having desired reflection characteristics. The coating surface of the mesh layer by an rustproof layer is only a surface, only a back surface, both a front surface and a back surface, only a side surface (both sides or one side), a front surface and both sides, a back surface and both sides, a surface, a back surface both sides, and both sides.

The rust-preventing layer is not particularly limited as long as it is harder to rust than the mesh-like conductor layer covered therewith, and an inorganic material such as metal, an organic material such as resin, or a combination thereof. In some cases, the blackening layer may also be coated with a rustproof layer to prevent the blackening layer particles from falling off and deformation, thereby increasing the darkness of the blackening layer. In this regard, when the mesh-shaped conductor layer is formed of metal foil, when the blackening layer is provided by the blackening treatment on the metal foil on the transparent substrate, before lamination of the transparent substrate and the metal foil in the sense of preventing the blackening layer from falling off or deterioration. It is desirable to provide.

What is necessary is just to employ | adopt a conventionally well-known antirust layer suitably, For example, metal, alloys, such as chromium, zinc, nickel, tin, copper, or a metal compound layer of a metal oxide. These can be formed by a known plating method or the like. Here, when an example of a rustproof layer preferable in terms of an rust prevention effect, adhesiveness, etc. is shown, the chromium compound layer obtained by carrying out chromate treatment after zinc plating is mentioned.

In the case of chromium, chromate (chromate) treatment may be used. The chromate treatment is performed by bringing the chromate treatment into contact with the treatment surface.

In addition, the chromate treatment is preferably galvanized before the treatment in view of adhesiveness and rust preventing effect. Moreover, in an rustproof layer, silicon compounds, such as a silane coupling agent, can also be contained in order to improve acid resistance at the time of an etching and acid washing.

Moreover, the thickness of a rustproof layer is about 0.001-2 micrometers normally, Preferably it is 0.01-1 micrometer.

[Transparent Resin Layer]

As illustrated in the cross-sectional view of FIG. 1B, the transparent resin layer 3 embeds the surface irregularities by the conductive mesh layer 2 and flattens the surface of the mesh layer side, thereby adhering the adherend and the adhesive on the mesh layer side. It is a layer provided as needed in order to prevent bubble mixing etc. in the case of lamination | stacking in a etc. or to protect a mesh layer from external force. Moreover, in terms of the said protection, this transparent resin layer is also a surface protection layer. In addition, as shown in FIG. 1C, the transparent resin layer 3 may be used as an adhesive layer between the adherend 4 and the conductive mesh layer 2 to adhere the two. Such transparent resin layer 3 can be formed by applying the liquid composition containing resin with respect to the uneven surface by the conductive mesh layer 2 laminated | stacked on the transparent base material 1 by application | coating etc .. As said liquid composition, if it contains transparent resin, there will be no limitation in particular, What is necessary is just to employ | adopt well-known resin suitably. For example, it is a thermoplastic resin, a thermosetting resin, an ionizing radiation curable resin. For example, the thermoplastic resins are acrylic resins, polyester resins, thermoplastic urethane resins, vinyl acetate resins, and the like, and thermosetting resins include thermosetting urethane resins, epoxy resins, thermosetting acrylic resins, and the like. Acrylate resin cured by In particular, the ionizing radiation curable resin which can be formed by coating in a state close to the solvent-free or solvent-free is particularly preferable in that the unevenness by the mesh layer is easily embedded.

In addition, the transparent resin layer is sufficient to fill only the opening of the conductive mesh layer in terms of planarization purpose, but may be formed including the upper portion of the line of the mesh layer as shown in FIG. In the case where the transparent resin layer is provided including the line portion immediately above, when the mesh layer surface in contact with the transparent resin layer is a blackening treatment surface, the color becomes wet color by the transparent resin layer. Particularly, in the present invention, even in the case of this wet color, the light reflection prevention effect is high, and therefore, the configuration including the just above the line portion to form the transparent resin layer is one of the suitable configurations.

[Other layers: adherend, optical filter layer, surface protective layer, transparent adhesive layer, etc.]

The adherend is, for example, an optical filter layer (film, sheet, plate), surface protective layer (film, sheet, plate), or the like. As an optical filter function of an optical filter layer, near-infrared absorption, reflection prevention (anti-glare), color tone adjustment (neon light absorption, color reproducibility improvement), external light reflection prevention, etc. are mentioned. Moreover, as a function of a surface protection layer, contamination prevention, abrasion resistance, etc. are mentioned. What is necessary is just to employ | adopt these conventionally well-known thing suitably. In addition, the optical filter layer and the surface protective layer may be formed on the mesh layer, on the transparent resin layer, or on the other optical filter layer in the case of the optical filter layer by coating or the like, not as an adherend of the transparent resin layer.

In addition, the to-be-adhered body 4 may be laminated | stacked on the transparent base material 1 side like FIG.1 (D), contrary to FIG.1 (C). When there is no adhesiveness between these, a transparent base material and a to-be-adhered body are laminated | stacked suitably through the transparent transparent adhesive bond layer. What is necessary is just to employ | adopt well-known adhesive agents, such as an adhesive without adhesive or an adhesive (adhesive layer) as a transparent adhesive bond layer. The said transparent adhesive bond layer can be called one form of a transparent resin layer. The adherend may be laminated on both the front and back surfaces of the electromagnetic wave shield filter for display. In that case, the kind (function) of a to-be-adhered body can be used separately from the front surface and the back surface.

[Etc]

Moreover, in resin which comprises electromagnetic wave shield filters, such as a transparent base material, a transparent resin layer, a transparent adhesive bond layer, and a to-be-adhered body, a well-known pigment | dye is suitably used in electromagnetic wave shield filters, such as a pigment | dye for external light reflection prevention, a neon light absorber, and a color adjustment pigment. You may add.

In addition, FIG. 1 which explains the detail of a mesh layer, and FIG. 2 which demonstrates a blackening process surface are an illustration and do not limit the form of the electromagnetic wave shield filter of this invention. Any thing which has a structure substantially the same as the technical idea described in the claim of this invention, and shows the same effect is contained in the technical scope of this invention.

Hereinafter, an Example is shown and this invention is demonstrated concretely. The present invention is not limited by these descriptions. In addition, in an Example, a part shows a weight part unless there is particular notice.

≪ Embodiment 1 >

First, as a transparent base material 1, a 10-micrometer-thick electrolytic copper foil with a 2-liquid curable urethane resin adhesive is made into the surface side of the continuous strip | belt-shaped colorless transparent biaxially stretched polyethylene terephthalate film (100 micrometers in thickness). Dry lamination was carried out to produce a continuous band-shaped copper adhesive laminated sheet.

Subsequently, the copper foil of the said copper adhesion laminated sheet was processed into the mesh shape by the etching using the photolithographic method, and the mesh laminated sheet in which the mesh-shaped conductor layer 21 was formed on the transparent base material 1 was created. .

Subsequently, the blackening process which forms the blackening layer 22 by black nickel plating is performed with respect to the surface of the mesh-shaped conductor layer side of this mesh laminated sheet, and the surface (and both sides) of the conductive mesh layer 2 are performed. An electromagnetic wave shield filter 10 as shown in FIG. 1A having a blackening treatment surface having reflection characteristics shown in Table 1 was fabricated. Moreover, the shape of the formed mesh is square in the opening part, 25 micrometers of line widths of a line part, and 150 micrometers of line pitches. In addition, the perimeter of the four sides of the mesh part was made into the frame-shaped non-mesh part.

In addition, as the transparent resin layer 3 which also serves as an adhesive layer with respect to the mesh layer side surface of the electromagnetic shielding filter 10, an intermittent die including a part of the inner circumference thereof to partially expose the acrylic resin coating liquid. The coating method was applied intermittently on the mesh layer. Subsequently, an antireflection film formed by forming a acetylene film having a thickness of 80 μm as a substrate on the surface of the coating film after solvent drying of the coating liquid and forming a fluororesin low refractive index layer as an antireflection layer on the surface thereof The base material side was laminated so that the anti-reflective layer might be exposed to the outermost surface, and the desired electromagnetic wave shield filter provided with the antireflection function was produced.

<2nd Example-5th Example>

In the same manner as in the first embodiment, except that the electrolytic copper foil was changed in the first embodiment, the electromagnetic shielding filter 10 as shown in FIG. Was produced. Subsequently, in the same manner as in the first embodiment, an electromagnetic wave shield filter with an antireflection function was produced.

Sixth Example

In the first embodiment, instead of changing the electrolytic copper foil and forming the blackening layer 22 by black nickel plating, the blackening layer 22 was attached by attaching copper particles having an average particle diameter of 1 nm by the cathode electrodeposition plating method. ) Was prepared in the same manner as in the first embodiment, and the electromagnetic wave shield filter 10 as shown in FIG. 1A having the blackening treatment surface of the reflection characteristic shown in Table 1 was fabricated. Subsequently, in the same manner as in the first embodiment, an electromagnetic wave shield filter with an antireflection function was produced.

Seventh Example

Instead of changing the electrolytic copper foil in the first embodiment and forming the blackening layer 22 by black nickel plating, blackening is carried out by attaching copper-cobalt alloy particles having an average particle diameter of 0.1 탆 by the cathode electrodeposition plating method. Except for forming the layer 22, in the same manner as in the first embodiment, an electromagnetic shielding filter 10 as shown in Fig. 1A having a blackening treatment surface of reflection characteristics shown in Table 1 was fabricated. Subsequently, in the same manner as in the first embodiment, an electromagnetic wave shield filter with an antireflection function was produced.

Eighth Embodiment

In the first embodiment, instead of changing the electrolytic copper foil and forming the blackening layer 22 by black nickel plating, blackening is carried out by attaching copper-cobalt alloy particles having an average particle diameter of 0.2 µm by the cathode electrodeposition plating method. Except for forming the layer 22, in the same manner as in the first embodiment, an electromagnetic wave shield filter 10 as shown in FIG. 1A having a blackening treatment surface having the reflection characteristics shown in Table 1 was fabricated. Subsequently, in the same manner as in the first embodiment, an electromagnetic wave shield filter provided with an antireflection function was produced.

<Example 9>

In the first embodiment, instead of changing the electrolytic copper foil and forming the blackening layer 22 by black nickel plating, copper particles having an average particle diameter of 1 μm were deposited by the cathode electrodeposition plating method, and then further Except for forming the blackening layer 22 by cobalt plating, the electromagnetic shielding filter 10 as shown in FIG. 1A having the blackening treatment surface of the reflection characteristic shown in Table 1 was made in the same manner as in the first embodiment. Produced. Subsequently, in the same manner as in the first embodiment, an electromagnetic wave shield filter provided with an antireflection function was produced.

<Tenth Embodiment>

First, as a transparent base material 1, the continuous strip | belt-color uncolored transparent biaxially stretched polyethylene terephthalate film which provided the polyester resin primer layer in one side with thickness of 100 micrometers was prepared. On the primer layer of this transparent base material, the nickel-chromium alloy layer of 0.1 micrometer in thickness and the copper layer of 0.2 micrometer in thickness were sequentially provided by the sputtering method, and it was set as the electrically conductive process layer. On the surface of the conductive layer, a copper plating layer having a thickness of 2.0 μm was provided by an electrolytic plating method using a copper sulfate bath, and a conductor layer composed of the conductive layer and the copper plating layer was formed directly on the transparent substrate without interposing an adhesive layer therebetween. And a copper adhesive laminated sheet were produced. Subsequently, the copper foil of the said copper adhesion laminated sheet was processed into the mesh shape by the etching using the photolithographic method, and the mesh laminated sheet in which the mesh-shaped conductor layer 21 was formed on the transparent base material 1 was created. . Then, blackening which precipitates a copper oxide fine particle of an average particle diameter of 0.1 micrometer with respect to the mesh-shaped conductor layer side surface of this mesh laminated sheet by oxidation using the mixed solution of the copper pyrophosphate aqueous solution, the potassium pyrophosphate aqueous solution, and the ammonia water. The treatment was carried out to produce an electromagnetic shielding filter 10 as shown in FIG. 1A having a blackening treatment surface having reflection characteristics shown in Table 1 on the surface (and both sides) of the conductive mesh layer 2. Otherwise, in the same manner as in the first embodiment, an electromagnetic wave shield filter provided with an antireflection function was produced.

<1st comparative example, 2nd comparative example>

An electromagnetic wave shield filter was produced in the same manner as in the first example except that the electrolytic copper foil was changed in the first example.

[Performance evaluation]

First, in the electromagnetic wave shield filter of an Example and a comparative example, the characteristic of a blackening process surface, and a performance evaluation result are shown in Table 1.

In addition, the reflection characteristic and micro unevenness | corrugation of the blackening process surface were evaluated in the blackening process surface of the mesh layer surface of the non-mesh part in the outer periphery of the mesh part of a mesh layer. In addition, the light reflection prevention performance was also performed in the part of a non-mesh part (however, the inner peripheral part in which an antireflection film is laminated | stacked through a transparent resin layer and becomes wet color) in that the influence of the opening part of a mesh part can be eliminated.

(1) Reflection characteristics of the blackened surface

The total light reflectance (%) measured according to JIS Z8722 of the blackening process surface sets the spectrophotometer (for example, Konica Minolta Sensing Co., Ltd., CM-3600d) to a reflection mode, and the light source is a standard Using a light D65 and a field of view of 2 °, the detector is set to an SCI mode in which the intensity of the total reflection light (integrated) of both the diffused reflected light and the specularly reflected light is measured among the reflected light, and the Y value (3 stimulus value XYZ Y) was measured. Further, the diffused light reflectance (%) according to JIS Z8722 of the blackened surface is similarly used by using a spectrophotometer, and the light source and the field of view are the same, so that the specularly reflected light is blocked by the light trap so that the detector only diffuses the reflected light among the reflected light. The Y value (Y of three stimulus values XYZ) was set in the SCE mode in which the (integral) intensity of the was measured.

(2) light reflection prevention performance

Evaluation of the light reflection prevention performance of an electromagnetic wave shield filter measured the total light reflectance (%) of the blackening process surface side from the antireflection film side in the state which became wet after laminating | stacking a transparent resin layer and a light reflection prevention film. (AR in the table). The measuring method of the total light reflectance was performed similarly to the measuring method of the total light reflectance in (1). The smaller one is preferable for the total light reflectivity AR in the wet state, and the case where the total light reflectance is less than 5% is an allowable range as a light reflection prevention performance.

(3) Ten-point average roughness (RzJIS) of the blackening process surface, Ra

The fine roughness of the blackening treatment surface was evaluated by ten-point average roughness (RzJIS) (JIS B0601 (1994 version, unit is µm)) of the contour curve when a roughness curve was adopted as the contour curve of the minute unevenness. In addition, as a reference value, the centerline average roughness Ra (JIS B0601, in units of μm) of the fine irregularities was also measured.

(4) probability density curve

It relates to the minute unevenness of the blackened surface, and the peak density (normal part) of the probability density function in the probability density function [JIS B0601 (2001 version) rule] of the said contour curve when the roughness curve is employ | adopted as the contour curve of the micro unevenness | corrugation. Whether the shape in the vicinity is a curve smoothing the probability density function, and when the probability density is taken along the longitudinal axis and in the upward direction (the horizontal axis is the amplitude value of the unevenness of the roughness curve), whether or not the shape is made of a convex upward curve. saw. As shown in Fig. 4A, when the shape near the peak becomes a convex upward curve, it is "convex upward", and as shown in Fig. 4B, the shape near the peak has a sharp point and has a sharp point. The case where all the curves located to the left and right with respect to the straight line parallel to the longitudinal axis passing through the peak point of the peak are convex downwards is abbreviated as "convex down".

Table 1

R _SCI
(%) R _SCE
(%) R _SCE / R _SCI AR
(%) RzJIS
(Μm) Probability density
Shape of curve Ra
(Μm) First Embodiment 7.0 7.0 One 2.5 4.53 Convex up 1.0 Second Embodiment 7.4 7.2 0.97 2.2 4.57 Convex up 0.9 Third Embodiment 9.9 9.9 One 1.8 2.36 Convex up 0.5 Fourth Embodiment 10.1 10.0 0.99 3.3 2.15 Convex up 0.3 Fifth Embodiment 10.8 10.8 One 3.3 4.30 - 0.6 Sixth embodiment 10.1 8.7 0.86 4.7 0.88 Convex up 0.5 Seventh Embodiment 3.0 2.9 0.97 1.5 1.71 - 0.4 Eighth Embodiment 2.5 2.5 One 1.1 0.95 Convex up 0.1 Example 9 6.5 6.3 0.97 3.8 1.01 - 0.1 Embodiment 10 3.9 3.7 0.96 2.8 0.57 - 0.04 Comparative Example 1 14.5 10.8 0.74 5.1 1.15 Convex down 0.2 Comparative Example 2 15.8 10.9 0.69 5.9 1.80 Convex down 0.4

-; Not measured

<Organize Results>

As shown in Table 1, the total light reflectance (R _SCI ) measured according to JIS Z8722 on the blackening surface is 14% or less, and the ratio of the diffuse light reflectance (R _SCE ) to the total light reflectance (R _SCI ). Each of the examples in which (R _SCE / R _SCI ) is 0.8 or more has a smaller total light reflectance AR in the wet state than the comparative examples which do not all satisfy these reflection characteristics, thereby providing better antireflection performance. Could get Examples and comparative examples other than the eighth to tenth examples, in the arithmetic mean roughness Ra of the surface, are within a range of 0.2 to 1.0 µm, which are all satisfactory in the related art, but differ in performance according to reflection characteristics. It turns out that there is. Moreover, it became clear by Example 8-Example 10 that favorable light reflection prevention performance can be acquired even if it is outside the range of the arithmetic mean roughness Ra of the surface which is good conventionally.

Claims (5)

In an electromagnetic wave shield filter having at least a conductive mesh layer on a transparent substrate, at least one surface of at least one of the front surface and the rear surface of the conductive mesh layer is blackened, and the total light rays measured according to JIS Z8722 of the blackened surface. reflectance and (R _SCI) is less than 14%, and the electromagnetic wave shielding filter, characterized in that at least the ratio (R _SCE / _SCI R) of the light diffusion reflectance (R _SCE) for the total light reflectance (R _SCI) 0.8. The ten-point average roughness (RzJIS) [JIS B0601 (1994 version)] of the roughness curve according to claim 1, wherein when the blackening treatment surface has minute unevenness and a roughness curve is employed as the contour curve of the fine unevenness, An electromagnetic wave shield filter, characterized in that the micrometer or more. The electromagnetic wave shield filter according to claim 1 or 2, wherein a transparent resin layer is laminated on the blackening treatment surface of the conductive mesh layer having the blackening treatment surface. The blackening treatment surface according to claim 1 or 2, wherein the blackened surface is selected from the group consisting of black nickel plating, copper particle adhesion by a cathode electrodeposition plating method, copper-cobalt alloy particle adhesion by a cathode electrodeposition plating method, cobalt plating, and copper oxide fine particle precipitation. The electromagnetic wave shield filter formed by the blackening process selected. The probability density function [JIS B0601 (2001 edition) regulation] of the contour curve of Claim 1 or 2 in which the said blackening process surface has micro unevenness, and when roughness curve is employ | adopted as the contour curve of micro unevenness | corrugation. The electromagnetic wave shield filter of the present invention is characterized in that the shape near the peak of the probability density becomes a convex upward shape when the probability density is taken along the vertical axis and in the upward direction, and the amplitude value of the roughness curve of the roughness curve is taken along the horizontal axis.

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