WO2005060326A1 - 電磁波シールド材、及びその製造方法 - Google Patents
電磁波シールド材、及びその製造方法 Download PDFInfo
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- WO2005060326A1 WO2005060326A1 PCT/JP2004/018631 JP2004018631W WO2005060326A1 WO 2005060326 A1 WO2005060326 A1 WO 2005060326A1 JP 2004018631 W JP2004018631 W JP 2004018631W WO 2005060326 A1 WO2005060326 A1 WO 2005060326A1
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- layer
- blackening
- electromagnetic wave
- metal layer
- wave shielding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
- H05K9/0096—Shielding materials being light-transmitting, e.g. transparent, translucent for television displays, e.g. plasma display panel
Definitions
- Electromagnetic wave shielding material and method of manufacturing the same
- the present invention relates to an electromagnetic wave shielding material for shielding EMI (Electro Magnetic Interference) generated from a display such as a cathode ray tube (hereinafter also referred to as CRT) and a plasma display panel (hereinafter also referred to as PDP). More specifically, the present invention relates to an electromagnetic wave shielding material which is excellent in visibility of a display image on a display in a light place and can be manufactured in a small number of manufacturing steps, and a method for manufacturing the same.
- EMI Electro Magnetic Interference
- ratio is “near infrared ray” and “PET” is “polyethylene terephthalate” and is an abbreviation, synonym, functional expression, common name, or industry term.
- a PDP is a combination of a glass substrate having a data electrode and a fluorescent layer and a glass substrate having a transparent electrode. When activated, a large amount of electromagnetic waves, near-infrared rays, and heat are generated in addition to visible light constituting an image.
- a front panel containing an electromagnetic wave shielding material is provided in front of the PDP to shield electromagnetic waves.
- the shielding performance of electromagnetic waves generated from the front of the display must have a function of 30 dB or more at 30 MHz and 1 GHz.
- the electromagnetic shielding material is difficult to see (it is said to have high invisibility) even in bright places where external light (sunlight, electric light, etc.) is incident. As a whole, it is required to have appropriate transparency (visible light transmittance, visible light transmittance).
- a copper layer is laminated on a PET film (transparent substrate) via an adhesive layer, and the copper layer is formed by photo-etching into a mesh shape consisting of many openings and lines surrounding the openings.
- a copper layer pattern is known in which the entire exposed surface (both front and back surfaces and all side surfaces) of a line portion is subjected to a blackening treatment (for example, see Patent Document 3).
- Patent Document 3 such a specification has sufficient electromagnetic wave shielding performance, and improves invisibility and prevention of whitening in a light place as compared with the specifications of Patent Documents 1 and 2 in which a metal layer is exposed.
- the blackening treatment is performed by a chemical conversion treatment, and needle-like crystals are formed.
- the blackening layer falls off or deforms before the copper layer with the blackening layer is laminated on the PET film. Further, there is a disadvantage that the degree of blackening is also changed or reduced, the curl is easily caused by high-temperature treatment, and the appearance is immediately deteriorated.
- a hydrophilic resin layer containing a palladium catalyst was formed on a transparent substrate, and a metal made of copper or nickel was electrolessly plated thereon, so that a blackening layer and a metal layer on the back side were laminated. Thereafter, the blackened layer and the metal layer are meshed by a photolithography method, and thereafter, a blackened layer is formed on the surface of the mesh and the side of the line portion by black nickel plating using an electrolytic plating method, and the entire exposed surface of the line portion is formed. There is also disclosed a method of performing a blackening treatment on the.
- the blackening layer and the metal layer are formed directly and continuously on the transparent substrate, it is difficult for the blackening layer to fall off and deteriorate during the manufacturing process.
- the strength and adhesive strength of the hydrophilic resin are not high, the metal layer, the blackened layer and the transparent base material are easily peeled off, and the electrode method is applied by the plating method.
- the disadvantage was that it took a long time to form a metal layer of sufficient thickness (several tens of ⁇ m) for magnetic wave shielding.
- Patent Document 1 JP-A-2000-13088
- Patent Document 2 Japanese Patent Application Laid-Open No. 2000-59079
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-9484
- Patent Document 4 JP-A-2000-77887
- the present invention has been made to solve such a problem.
- the purpose is to make the entire exposed surface of the meshed metal layer black so that even in a light place, it has appropriate transparency, high electromagnetic wave shielding, mesh invisibility, and good appearance.
- the blackening layer prevents falling-off damage and deterioration during production, and also improves the adhesion of each layer, reducing the processing time and the number of manufacturing steps.
- An electromagnetic wave shielding material that can be manufactured by the method described above, and a method for manufacturing the same.
- the present invention relates to a transparent base material, a mesh-like metal layer provided on one surface of the transparent base material via an adhesive, and having a line portion forming an opening, and a line portion of the mesh-like metal layer.
- the first blackening layer and the layer ⁇ layer sequentially provided on the surface of the transparent base material, and the second black layer provided on the surface of the mesh metal layer opposite to the transparent base material at the line portion and the side surface of the line portion.
- An electromagnetic wave shielding material characterized by comprising an oxide layer.
- the present invention is the electromagnetic wave shielding material, wherein the second blackening layer contains a nickel alloy.
- the present invention is the electromagnetic shielding material, wherein the first blackening layer contains a nickel-chromium alloy.
- the present invention is the electromagnetic wave shielding material, wherein the first blackening layer contains a copper-cobalt alloy, and the second blackening layer contains a nickelole alloy.
- the present invention is an electromagnetic wave shielding material characterized in that the protection layer contains a chromium compound.
- the present invention is an electromagnetic wave shielding material characterized in that the protection layer contains chromium and / or zinc.
- the present invention is the electromagnetic wave shielding material, wherein the protection layer contains a metal other than chromium.
- the present invention relates to a method for producing an electromagnetic wave shielding material comprising: a transparent substrate; and a mesh-shaped metal layer provided on one surface of the transparent substrate via an adhesive and having a line portion forming an opening, A step of preparing a transparent substrate and a metal layer; a step of sequentially forming a first blackening layer and a protection layer on one surface of the metal layer; and a step of forming the metal layer, the first blackening layer and the protection layer.
- the step of forming the first blackening layer includes a step of forming a copper-cobalt alloy by electrolytic plating
- the step of forming the second blackening layer includes a step of forming a nickel alloy by electrolytic plating And a method for manufacturing an electromagnetic wave shielding material.
- the present invention is the method for producing an electromagnetic wave shielding material, wherein the step of forming the protection layer includes a chromate treatment step.
- the present invention is the method for producing an electromagnetic wave shielding material, wherein the transparent substrate includes a polyethylene terephthalate film, and the step of laminating the protective layer and the transparent substrate includes a dry lamination method.
- the electromagnetic wave shielding material has appropriate transparency and high electromagnetic wave shielding properties, and a blackening layer is formed on the entire exposed surface of the line portion. For this reason, an electromagnetic wave shielding material which is excellent in the non-visibility of the mesh, the contrast of the image in the presence of external light, and the visibility of the display image on the display is provided. Furthermore, since the protection layer is formed on the blackening layer on the transparent substrate side, the blackening layer on the transparent substrate side falls off and the degree of blackening during the lamination process of the transparent substrate and the metal layer. Reduction or change is also prevented. Further, the performance in the presence of external light can be reliably obtained, and an electromagnetic wave shielding material in which the metal layer and the blackening layer and the transparent substrate are firmly adhered to each other by the adhesive is provided.
- the blackening degree of a mesh is favorable
- the present invention provides an electromagnetic wave shielding material having excellent image contrast and excellent visibility of a display image on a display.
- the electromagnetic wave shielding material which is excellent in the durability which a metal layer does not adhere easily is provided.
- the electromagnetic shielding material which can ensure the favorable adhesiveness of a protective layer and a blackening layer reliably is provided.
- the manufacturing method of the electromagnetic shielding material which can easily form a blackening layer on all the surfaces of a mesh line part, and can manufacture an electromagnetic shielding material in a short time and the number of manufacturing processes is provided.
- the manufacturing method of the electromagnetic shielding material which is darker and a blackening layer is hard to fall off is provided.
- the manufacturing method of the electromagnetic shielding material which can be manufactured easily and is excellent in the prevention effect is provided.
- a thin transparent substrate can be easily manufactured by existing technology and equipment, and combined with other optical members such as a near-infrared shielding material, an antireflection material and / or an antiglare property, a PDP front plate
- other optical members such as a near-infrared shielding material, an antireflection material and / or an antiglare property, a PDP front plate
- a method for manufacturing an electromagnetic wave shielding material is provided.
- FIG. 1 is a plan view showing an embodiment of an electromagnetic wave shielding material according to the present invention.
- FIG. 2 is a perspective view of a mesh part of FIG. 1.
- FIG. 3 is a cross-sectional view of a mesh part showing one embodiment of the electromagnetic wave shielding material according to the present invention.
- FIG. 4 is a cross-sectional view illustrating a flow of a method for manufacturing an electromagnetic wave shielding material according to the present invention.
- FIG. 1 is a plan view of an electromagnetic wave shielding material according to the present invention.
- FIG. 2 is an enlarged perspective view of the mesh part of FIG.
- FIG. 3 is a cross-sectional view of a mesh portion of the electromagnetic wave shielding material according to the present invention.
- FIG. 4 is a cross-sectional view illustrating the flow of the method for manufacturing an electromagnetic wave shielding material according to the present invention. is there.
- the method for producing an electromagnetic wave shielding material of the present invention is for producing an electromagnetic wave shielding material.
- the electromagnetic wave shielding material is provided on at least one surface of the transparent substrate 11 via an adhesive layer.
- a mesh-shaped metal layer 21 composed of a plurality of line portions 107 forming openings 105 formed in a two-dimensional system 1J is provided.
- the entire exposed surface of both front and back surfaces and side surfaces of the line portion 107 of the metal layer 21 is blackened.
- such a manufacturing method includes: (1) a step of preparing a metal layer 21; and (2) a first blackening layer 25A on one surface of the metal layer 21.
- the electromagnetic wave shielding sheet 1 is provided with a transparent substrate 11 and an adhesive layer 13 on one surface of the transparent substrate 11. And a mesh-like metal layer 21.
- the mesh-like metal layer 21 has a line portion 107 forming an opening 105.
- a first blackening layer 25A and a protection layer 23A are sequentially provided on the surface of the mesh-shaped metal layer 21 on the transparent substrate 11 side of the line portion 107, and the surface of the line portion 107 opposite to the transparent substrate 11 and the line portion 107 are provided.
- a second blackened layer 25B is provided on the side surface of the second blackened layer 25B.
- a mesh 103 and a frame portion 101 surrounding the mesh portion 103 are formed on the transparent substrate 11.
- the mesh part 103 is formed by a laminated structure of the protection layer 23A / first blackening layer 25A / mesh-like metal layer 21 / second blackening layer 25B, and the frame part 101 is the protection layer 23A / first black layer. And a second blackened layer 25B.
- the mesh portion 103 is provided with a line portion 107 forming an opening portion 105 corresponding to the opening portion and the line portion of the mesh-like metal layer 21.
- Metal layer As a material of the metal layer 21, for example, a metal having sufficient conductivity such as gold, silver, copper, iron, nickel, chromium, and aluminum can be applied.
- the metal layer is not a simple substance, but may be an alloy or a multilayer. Preference is given to low-carbon steels such as mud steel and low-carbon aluminum-killed steel, Ni--Fe alloys, and invar alloys. In addition, when performing cathodic electrodeposition as a blackening treatment, copper or copper is used because of the ease of electrodeposition. Alloy foils are preferred.
- the copper foil a rolled copper foil or an electrolytic copper foil can be used, but an electrolytic copper foil is preferable in terms of uniformity of thickness, adhesion to a blackened layer, and a thin film having a thickness of 10 zm or less.
- the thickness of the metal layer 21 is about 11 ⁇ 10 ⁇ m, preferably 5 ⁇ 20 ⁇ m. If the thickness is less than this, the mesh processing by photolithography becomes easy. The electric resistance of the metal increases, and the electromagnetic wave shielding effect is impaired. Above this level, the desired high-definition mesh shape cannot be obtained. As a result, the effective aperture ratio is reduced, the light transmittance is reduced, the visual angle is also reduced, and the image visibility is reduced. .
- the surface roughness of the metal layer 21 is preferably 0.510 ⁇ m in Rz value. Below this, the external light is specularly reflected even if the blackening process is performed, and the visibility of the image is degraded. Above this, when applying the adhesive or resist, it may not spread over the entire surface or bubbles may be generated.
- the surface roughness Rz is a 10-point average roughness value measured according to JIS-B0601.
- Step A step of forming a first blackening layer 25A and a protection layer 23A on one surface of the metal layer 21.
- a second protection layer 23B may be formed on the surface of the metal layer 21 opposite to the first blackening layer 25A and the protection layer 23A (FIG. 4 (b)).
- the formation of the first blackening layer 25A that is, the blackening treatment is performed by laminating a metal layer 21 formed in advance on a transparent substrate 11 via an adhesive layer 13.
- the first blackening layer 23A cannot be formed after lamination, so that the first blackening layer 23A is formed as a single metal layer 21.
- various methods such as formation of metals, alloys, metal oxides, and metal sulfides that can be obtained by roughening and Z or blackening the surface of the metal layer can be applied.
- Preferred blackening treatments include a plating method, a vacuum deposition method, a sputtering method, and the like.
- the plating method it is possible to provide excellent adhesion to the metal layer and to uniformly and easily blacken the surface of the metal layer. it can.
- the material of the plating at least one selected from copper, cobalt, nickel, zinc, molybdenum, tin, and chromium is used, or a compound containing the metal is used. Other metal or The compound has insufficient blackening or lacks close contact with the metal layer. For example, cadmium plating is remarkable.
- the reason why the blackening layer (first blackening layer 25A) is formed only on the back surface of the metal layer 21 before the laminating step (third step) is as follows. That is, the back surface of the metal layer 21 (the transparent substrate 11 side) is processed into a mesh pattern in a state of being bonded to the transparent substrate 11, so that after the step of processing into a mesh pattern (fourth step). First, it is impossible to form the blackened layer 25A. Therefore, it is necessary to complete the formation of the first blackened layer 25A before the lamination process.
- the formation of the blackened layer on the surface of the metal layer 21 (the side opposite to the transparent substrate 11) can be performed before the lamination step or after the lamination step.
- the formation of the blackened layer on the side surface of the line portion 107 is performed by laminating a metal layer on a transparent substrate and processing it into a mesh pattern (the side surface of the line portion 107 appears together with the opening portion 105 at this stage). Considering that it can only be done), if the formation of the blackening layer on the surface of the metal layer is performed before the lamination step, the formation of the blackening layer will be required three times (back, front, side). On the other hand, if the formation of the blackening layer on the surface of the metal layer is performed after processing into a mesh-like pattern, the formation of the blackening layer only needs to be performed twice (at the same time for the back surface, the front surface and the side surface). Therefore, it is preferable to provide the first blackening layer 25A only on the back surface of the metal layer 21 at a stage before the laminating step in terms of process shortening and simplification.
- the first blackening layer 25A is a copper-cobalt alloy or a nickel-chromium alloy.
- a copper-cobalt alloy it is formed by a plating method, and is formed into particles.
- a plating method there is a cathodic electrodeposition plating method in which a copper foil is subjected to a cathodic electrolysis treatment in an electrolytic solution composed of sulfuric acid, copper sulfate, cobalt sulfate or the like to attach cationic particles.
- the first blackened layer 25A that is rough and black can be obtained.
- the cationic particles copper particles, a force to which alloy particles of copper and other metals can be applied, preferably copper-cobalt alloy particles, and the average particle diameter of the copper-cobalt alloy particles is 0.1 lxm.
- the particles can be suitably attached to the particles having an average particle diameter of 0.1 to 1 ⁇ m.
- the copper foil surface becomes cathodic, generates and activates reducing hydrogen, and the adhesion between the copper foil and the particles is significantly improved.
- the average particle diameter of the copper-cobalt alloy particles is out of this range, for example, the copper-cobalt alloy If the particle size of the particles is increased beyond this range, the degree of blackening decreases and the particles fall off (also referred to as powder fall) and become chewy. In addition, the dense particles lack the fineness of appearance, and the unevenness of the appearance and light absorption becomes conspicuous. Even if the average particle diameter of the copper-cobalt alloy particles is less than this range, the degree of blackening is insufficient, and the reflection of external light cannot be suppressed, so that the visibility of the image is deteriorated. Further, blackening treatment with black chromium or black nickel is also preferable because the conductivity and the degree of blackness are good and the particles do not fall off.
- the nickel-chromium alloy can be formed by plating, vacuum evaporation, sputtering, or the like.
- Nickel-chromium alloys are preferred in terms of electromagnetic wave shielding because they have good adhesion to copper and high conductivity.
- a protection layer 23A is formed on the surface of the first blackening layer 25A.
- the protection layer 23A has a function of protecting the metal layer 21 and the first blackening layer 25A, and if the blackening treatment is a particle, prevents the particles from falling off or deforming.
- the degree of blackening of the blackening layer 25A can be further increased.
- the reason for forming the protection layer in this manner is as follows. That is, the lamination step (in the sense that the first blackening layer 25A is protected from falling off or being deteriorated before the first blackening layer 25A is bonded to the transparent substrate 11) is performed for the protection layer 23A. It must be formed before the third step).
- the protective layer 23A may be a metal to which a known protective layer can be applied, such as a metal such as chromium, zinc, nickel, tin, or copper or an alloy thereof, or an oxide of the metal or a chromium compound.
- a layer of chromium compound is preferably used, in which zinc is applied and then chromate treated.
- a silicon compound that preferably contains a silicon compound includes a silane coupling agent.
- the protective layer 23A also has good adhesion to the first blackening layer 25A (particularly, a copper-cobalt alloy particle layer) and adhesion to the adhesive layer 13 (particularly, a two-part curable urethane resin adhesive). Excellent.
- the protection layer 23A contains nickel, if the nickel is immobilized, the adhesion between the protection layer 23A and the second blackening layer 25B is weakened, and the blackening layer 25B may be easily peeled off.
- Metals such as chromium, zinc, nickel, tin and copper or alloys thereof, or oxides of the above-mentioned metals can be formed by a known plating method. For the formation of the chromium compound, a known plating method or a chromate (chromate) treatment is used. Thickness of the protection layer As a result, it is about 0.001-10 / im, preferably 0.01-1 / im.
- a coating method or a pouring method is used as a method for forming the protection layer 23A by chromate treatment, and the protection layer 23A may be provided on one side of the metal layer 21 by a dive method. May be provided.
- the protection layer on the first blackening layer 25A is referred to as a protection layer 23A
- the protection layer on the metal layer 21 is referred to as a second protection layer 23B.
- the second protection layer 23B is composed of a layer containing no nickel, but prior to the second blackening treatment, the surface of the metal layer 21 is formed. It is preferable to remove the second barrier layer 23B with an acid aqueous solution or the like.
- the adhesion of the second blackening layer 25B is reduced due to the surface of the second barrier layer 23B being chemically inactive or inhibiting the deposition of the metal oxide layer on the surface. Need to be removed.
- chromate treatment In the chromate treatment, a chromate treatment liquid is applied to a material to be treated and treated. As a coating method, a roll coat, a curtain coat, a squeeze coat, an electrostatic atomization method, an immersion method, or the like can be applied. After the application, drying may be performed without washing with water.
- a chromate treatment solution an aqueous solution containing chromic acid is usually used. Specifically, Alsurf 1000 (manufactured by Nippon Paint Co., Ltd., trade name of chromate treatment agent), PM-284 (manufactured by Nippon Parkerizing Co., Ltd., trade name of chromate treatment liquid) and the like can be exemplified.
- the composition of the first blackening layer / anti-scratch layer (two layers of zinc / chromate treatment), which is preferably applied with zinc plating, has the effect of adhesion between layers, anti-scratching and blackening degree. Can be higher.
- Transparent Substrate As the material of the transparent substrate 11, various materials can be used as long as they have the conditions of use, transparency, insulation, heat resistance, mechanical strength, and the like that can withstand production. Or a transparent resin.
- quartz glass, borosilicate glass, soda lime glass, etc. can be used.
- the coefficient of thermal expansion is small, the dimensional stability and workability in high-temperature heat treatment are excellent, and the alkali-free glass contains no alkali component. Glass can be used, and the transparent substrate 11 may also be used as the electrode substrate.
- Transparent resins include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, terephthalic acid-isophthalic acid-ethylene glycol copolymer, terephthalate Polyester resins such as oleic acid-cyclohexane dimethanol-ethylene glycol copolymer, polyamide resins such as nylon 6, polyolefin resins such as polypropylene and polymethylpentene, and acrylic resins such as polymethyl methacrylate Examples thereof include sheets, films, and plates made of styrene resins such as polystyrene and styrene-acrylonitrile copolymer, cellulose resins such as triacetyl cellulose, imide resins, and resins such as polycarbonate.
- the transparent substrate 11 made of a transparent resin may be made of a mixture of two or more of these resins (including alloys) or a laminate of a plurality of layers, in addition to using these resins alone. Les ,.
- the transparent substrate may be a stretched film or an unstretched film, but a film stretched in a uniaxial or biaxial direction is preferably used for the purpose of improving strength.
- the thickness of the transparent substrate is usually about 12 1000 m.
- the applicable force is 50-700 zm force S is suitable, and the 100-500 ⁇ m force S is optimal. It is. In the case of a transparent substrate made of glass, a force S of about 1000-5000 / im is usually suitable. With respect to the laser deviation, if the thickness is less than this, the mechanical strength is insufficient, causing warpage, sagging, breakage, and the like. If the thickness is more than this, excessive performance is caused and the cost is wasted.
- a polyester resin film such as polyethylene terephthalate or polyethylene naphthalate, an acrylic resin, or a glass plate is preferably used because of its transparency, heat resistance, and low cost.
- biaxially stretched polyethylene terephthalate film is optimally used because it is difficult to break, is lightweight and easy to mold. The higher the transparency of the transparent substrate 11, the better, but preferably the visible light transmittance is 80% or more.
- the transparent substrate 11 Prior to the application of the adhesive layer 13, the transparent substrate 11 is subjected to corona discharge treatment, plasma treatment, ozone treatment, flame treatment, primer (anchor coat, adhesion promoter, An easy adhesion treatment such as a coating treatment, a pre-heat treatment, a dust removal treatment, a vapor deposition treatment, an aluminum treatment, etc. may be performed. If necessary, additives such as an ultraviolet absorber, a filler, a plasticizer, and an antistatic agent may be added to the transparent substrate 11.
- Lamination Method The transparent base material 11 and the surface of the protective layer 23A of the laminate including the protective layer 23A / first blackening layer 25AZ metal layer 21Z described above are laminated with an adhesive.
- Lamination also referred to as lamination
- a resin such as an adhesive or a pressure-sensitive adhesive
- a mixture of these materials may be used as a fluid such as a heated melt, an uncrosslinked polymer, a latex, an aqueous dispersion, or an organic solvent solution, as well as a known printing or coating such as screen printing, gravure printing, comma coating, rhonorecoat, etc.
- the adhesive pressure-sensitive adhesive layer
- the thickness of the adhesive layer is preferably about 0.1 to 20 zm (dry state), and more preferably 110 to 10 zm.
- a specific laminating method is usually performed in a continuous belt-like state (called winding), and is unwound from a winding hole and stretched to form a metal layer and Z or a base film. After the adhesive is applied and dried, the other material is overlaid and pressed.
- the method is called a dry lamination method (also referred to as dry lamination) by those skilled in the art.
- an electromagnetic radiation-curable resin that is cured (reacted) by ionizing radiation such as ultraviolet (UV) or electron beam (EB) is also preferably used.
- the dry lamination method is a method in which an adhesive dispersed or dissolved in a solvent is dried to a film thickness of about 0.1 to 20 / m (dry state), preferably 1 to 10 / m. For example, it is applied by a coating method such as a Lohno coating, a reverse coating, a gravure coating, and the like, and the solvent is dried to form the adhesive layer. After laminating, the adhesive is cured by aging at 30-80 ° C for several hours and several days to laminate the two materials. As the adhesive layer used in the dry lamination method, an adhesive which is cured by heat or ionizing radiation such as an ultraviolet ray or an electron beam can be applied.
- thermosetting adhesive specifically, a reaction between a polyfunctional isocyanate such as tolylene diisocyanate or hexamethylene diisocyanate and a compound containing a hydroxyl group, such as a polyether polyol or a polyacrylate polyol, is used.
- a polyfunctional isocyanate such as tolylene diisocyanate or hexamethylene diisocyanate
- a compound containing a hydroxyl group such as a polyether polyol or a polyacrylate polyol
- a two-part curable urethane-based adhesive, an acrylic adhesive, a rubber-based adhesive, and the like obtained by the above method can be used, but a two-part curable urethane-based adhesive is preferable.
- the solar protection layer 23A / first blackening layer 25A / metal layer 21 is With one photolithography method A mesh pattern is used.
- a resist layer is provided in a mesh pattern on the surface of the metal layer 21 in the laminate, and a portion of the metal layer not covered with the resist layer / first blackening layer / prevention ⁇ ⁇ After the layer is removed by etching, the resist layer is removed to form an electromagnetic wave shielding layer having a mesh pattern.
- the electromagnetic wave shielding layer is composed of a mesh portion 103 and a frame portion 101 provided on a peripheral portion thereof as necessary, and is formed by a perspective view of FIG. 2 and a sectional view of FIG.
- the mesh portion 103 has a plurality of openings 105 formed by the line portions 107 where the metal layer remains, and the frame portion 101 has no openings and the metal layer 21 is left over the entire surface.
- the frame part 101 may be provided on at least one part of the force adjacent to the mesh part 101 and provided on the entire circumference of the mesh part 101 if necessary.
- This step also includes a step of processing a roll-shaped laminate continuously wound in a belt shape. While continuously or intermittently transporting the laminate, it is masked, etched, and stripped of resist while being stretched without loosening.
- a photosensitive resist is applied onto the metal layer 21, and after the photosensitive resist is dried, the photosensitive resist is contact-exposed to a predetermined pattern (a mesh line portion and a frame portion). Then, develop with water, apply a hardening treatment, and bake.
- the resist is applied by feeding the resist such as casein, PVA, gelatin, etc., dipping, dipping, curtain coating, pouring, etc. onto the metal layer 21 while continuously or intermittently transporting the winding roll-shaped lamination. In the manner described above.
- a dry film resist without applying a photosensitive resist may be used. In this case, workability is improved. Baking is usually performed at 100-300 ° C for casein resist.
- Etching After the masking, the laminated body is etched.
- an aqueous solution of ferric chloride and cupric chloride which can be easily used in circulation, is preferable as an etching solution used for etching.
- Etching is performed using basically the same equipment as that used to manufacture shadow masks for cathode-ray tubes for color TVs, which etch strip-shaped continuous steel materials, especially thin plates with a thickness of 20 to 80 ⁇ m.
- existing manufacturing facilities for shadow masks can be diverted, and continuous production can be performed consistently from masking to etching, which is extremely efficient.
- wash with water, alkaline solution After the resist is stripped off and washed, the laminate is dried.
- the second protective layer 23 B is formed on the surface of the metal layer 21 where the first blackened layer is not formed, the second protective layer 23 B is formed depending on the material of the protective layer 23 B.
- the adhesion of the blackened layer 25B may be hindered.
- the removal of the second barrier layer 23B can be performed with an acid or alkali solution.
- the (mesh) mesh portion 103 is a region surrounded by the frame portion 101.
- the mesh portion 103 includes a line portion 107 forming a plurality of openings 105.
- the shape (mesh pattern) of the opening 105 is not particularly limited, and is, for example, a polygon such as a triangle such as a regular triangle, a square such as a rectangle, a rectangle, a diamond, a trapezoid, a hexagon, a circle, or an ellipse. Shapes and the like can be applied.
- a mesh is formed from these openings 105.
- the width of the line portion 107 is 50 ⁇ m or less, preferably 20 ⁇ m or less, and the interval (line pitch) of the line portion 107 is preferably 150 ⁇ m or more from the light transmittance. Preferably it is 200 ⁇ m or more.
- the bias angle (the angle between the line portion of the mesh and the side of the electromagnetic wave shielding sheet) may be appropriately selected in consideration of the pixels of the display and the light emission characteristics in order to eliminate moire.
- the mesh pattern is subjected to blackening treatment, and as shown in FIG. 4 (e), the surface of the metal layer 21, the side surfaces of the metal layer 21, and the first blackening layer 25A.
- the second blackening layer 25B is formed by coating over the side surface of the metal and the side surface of the protection layer 23A.
- the material and forming method of the second blackening layer 25B may be the same as the material and forming method of the first blackening layer 25A.
- black chromium, black nickel, and a nickel alloy are used.
- the nickel alloy a nickel-zinc alloy, a nickel tin alloy, and a nickel-tin alloy are used.
- nickel alloy has good conductivity and good blackness.
- the second blackening layer 25B can have not only the blackening effect but also the protection function of the metal layer 21.
- the particles of the blackened layer are usually needle-shaped and easily deformed by external force to change their appearance.However, in the case of nickel alloy, the surface of the second blackened layer 25B, where the particles are easily deformed, is exposed. In this state, the subsequent processing steps can be easily performed, which is more preferable. Formation of nickel alloy As a method, a known electrolytic or electroless plating method is used, and after performing nickel plating, a nickel alloy may be formed.
- Blackening treatment By performing the blackening treatment in this manner, the blackening treatment is performed on the surface (the surface of the bank) and the side surface (the side surface of the bank) of the line portion 107 of the mesh-like metal layer 21. be able to. As a result, the entire pattern of the mesh-like metal layer 21 is covered with the blackening layer, so that the electromagnetic waves generated by the PDP force are shielded, and at the same time, the metal mesh line for electromagnetic wave shielding is connected to the external part such as a fluorescent lamp. Light reflection of both light and the display light from the PDP is suppressed, and the display image on the display can be viewed in good condition with high contrast
- the surface roughening and the blackening due to the increase in the absorptivity in the entire visible light wavelength range are collectively referred to as blackening treatment.
- the preferred reflection Y value of the blackening treatment is about 15 or less, preferably 5 or less, and more preferably 2.0 or less.
- the reflection Y value was measured with a spectrophotometer UV-3100PC (manufactured by Shimadzu Corporation) at an incident angle of 5 ° (wavelength from 380 nm to 780 nm).
- the electromagnetic wave shielding sheet of the present invention can be used as a front panel for a PDP, preferably by combining other optical members.
- an optical member that has the function of absorbing near-infrared light near-infrared light emitted from the PDP is absorbed, and malfunctions of remote control devices and optical communication devices used near the PDP can be avoided. Can be prevented.
- an optical member having an anti-reflection and / or anti-glare function the reflection of display light from the PDP and external light from the outside can be suppressed, and the visibility of the displayed image can be improved.
- the frame portion 101 When the frame portion 101 is provided, the frame portion 101 also undergoes the blackening process at the same time as the mesh portion, so that it becomes darker, so that the display device has a high-class appearance. Further, since the electromagnetic wave shielding layer of the electromagnetic wave shielding material of the present invention has black surfaces on both sides, any surface may be directed to the PDP.
- any of the processes is continuously or intermittently conveyed in a roll (winding) shape continuously wound in a belt shape. Since it can be processed while being manufactured, it can be manufactured with high productivity in a short process in which multiple processes are put together.
- the present invention includes the following modifications.
- the concave portion of the opening 105 is further filled with a transparent resin, and the surface unevenness of the mesh portion 103 (the convex portion of the line portion 107 and the concave portion of the opening portion 105). Part) may be flattened.
- another member a transparent substrate, a near-infrared absorption filter, an anti-reflection filter, etc.
- a transparent substrate, a near-infrared absorption filter, an anti-reflection filter, etc. is laminated on the mesh portion of the electromagnetic wave shielding material in a later step with an adhesive layer interposed therebetween. At this time, it is possible to prevent the sharpness of the image from being reduced due to light scattering due to the bubbles remaining in the concave portions.
- an electrolytic copper foil having a thickness of 10 ⁇ 10 ⁇ was used as the metal layer 21, and copper-cobalt alloy particles (average particle diameter 0.3 / m) were cathodically electrodeposited on one surface to perform a blackening treatment.
- a blackening treatment was performed to form a first blackened layer 25A.
- a known chromate treatment was performed by a dive method to prevent the front and back surfaces of the metal layer 21 from both sides.
- the protection layer on the first blackening layer 25A side is referred to as a protection layer 23A
- the protection layer on the metal layer side is referred to as a second protection layer 23B.
- the first blackening layer 25A side, the protective layer surface 23A, and a transparent base material 11 made of 100 ⁇ m-thick PET film # 4300 (trade name of polyethylene terephthalate film, manufactured by Toyobo Co., Ltd.) are cured in two liquids.
- an adhesive layer 13 composed of a mold urethane-based adhesive After laminating with an adhesive layer 13 composed of a mold urethane-based adhesive, the laminate was aged at 50 ° C. for 3 days to obtain a laminate.
- the adhesive used was Takerak A-310, a main agent composed of polyester urethane polyol, and Takenate A-10, a curing agent composed of xylene diisocyanate (both trade names, manufactured by Takeda Pharmaceutical Co., Ltd.). Later thickness was 7 ⁇ m.
- the protection layer 23A / first blackening layer 25A / metal layer 21 / second protection layer of the laminate was meshed by photolithography to form a pattern.
- a casein-based photosensitive resist was applied to the entire surface of the second protective layer of the laminate by a dive method. Intermittently conveyed to the next station, with a square opening, a line width of 22 ⁇ , a line interval (pitch) of 300 / im, a mesh part 103 with a bias angle of 49 degrees, and a 15 mm wide frame surrounding the mesh part 103 Negapa of part 101 Using a turn plate, ultraviolet light from a mercury lamp was irradiated to perform contact exposure. While successively transporting the stations, they were water-developed, hardened, and baked by heating.
- the wafer was transported to the next station, and sprayed by a spray method using an aqueous solution of ferric chloride as an etching solution to form an opening. While successively transporting the station, it was washed with water, the resist was peeled off, washed, and dried with warm air to form a mesh. Next, the mesh was subjected to a second blackening treatment. First, the laminate is immersed in a 3% sulfuric acid aqueous solution bath for 10 seconds to remove the second barrier layer 23B.
- a nickel ammonium sulfate aqueous solution, a zinc sulfate aqueous solution, and a sodium thiosulfate aqueous solution are used as a blackening treatment bath.
- the laminate was immersed in this mixed aqueous solution, subjected to electrolytic plating, and subjected to blackening treatment to form a second blackened layer 25B made of a nickel-zinc alloy.
- the second blackening layer 25B is covered from the surface of the metal layer 21 as shown in FIG. 3, to the side of the metal layer 21, the side of the first blackening layer 25A, and the side of the protection layer 23A.
- An electromagnetic wave shielding material 1 as shown was obtained.
- a blackening treatment plating bath As a blackening treatment plating bath, a mixed aqueous solution of a nickel ammonium sulfate aqueous solution, a tin sulfate aqueous solution, and a sodium thiosulfate aqueous solution is used, and the laminate is immersed in the mixed aqueous solution and subjected to electrolytic plating to perform the second plating.
- An electromagnetic wave shielding material 1 was obtained in the same manner as in Example 1 except that the blackening layer 25B was formed from a nickel alloy.
- a blackening treatment plating bath As a blackening treatment plating bath, a mixed aqueous solution of nickel ammonium sulfate aqueous solution, tin sulfate aqueous solution, copper sulfate aqueous solution, and sodium thiosulfate aqueous solution was used, and the laminate was immersed in this mixed aqueous solution.
- An electromagnetic wave shielding material 1 was obtained in the same manner as in Example 1 except that the second blackening layer 25B was formed from the same alloy of nickel and tin "I.
- An electromagnetic wave shielding material 1 was obtained in the same manner as in Example 1 except that a protective layer was formed from a chromium-zinc alloy by a plating method instead of the zinc plating and chromate treatment. However, zinc is eluted from the chromium-zinc barrier layer during the alkaline cleaning when the resist is stripped, and the second barrier layer is a chromium-only layer.
- Comparative Example 1 The first protective layer side of the laminate of the second protective layer / metal layer / first blackening layer / protective layer Example 2 except that the second protective layer side was laminated on the transparent base material 11 and the blackening layer was provided only on the surface of the line portion, and no blackening layer was provided on the back and side surfaces of the line portion. Similarly, an electromagnetic wave shielding material of Comparative Example 1 was obtained.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/583,267 US7375292B2 (en) | 2003-12-16 | 2004-12-14 | Electromagnetic wave shielding filter and process for producing the same |
DE112004002419T DE112004002419T5 (de) | 2003-12-16 | 2004-12-14 | Elektromagnetisches Wellenabschirmfilter und Verfahren zur Herstellung desselben |
JP2005516309A JPWO2005060326A1 (ja) | 2003-12-16 | 2004-12-14 | 電磁波シールド材、及びその製造方法 |
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JP2003417467 | 2003-12-16 | ||
JP2003-417467 | 2003-12-16 |
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WO2005060326A1 true WO2005060326A1 (ja) | 2005-06-30 |
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PCT/JP2004/018631 WO2005060326A1 (ja) | 2003-12-16 | 2004-12-14 | 電磁波シールド材、及びその製造方法 |
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US (1) | US7375292B2 (ja) |
JP (1) | JPWO2005060326A1 (ja) |
KR (1) | KR20060118553A (ja) |
DE (1) | DE112004002419T5 (ja) |
TW (1) | TW200529245A (ja) |
WO (1) | WO2005060326A1 (ja) |
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WO2011040280A1 (ja) * | 2009-09-30 | 2011-04-07 | Jx日鉱日石金属株式会社 | Sn又はSn合金めっき被膜、及びそれを有する複合材料 |
JP2014219987A (ja) * | 2013-05-10 | 2014-11-20 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | タッチセンサ |
JP2015533678A (ja) * | 2012-08-31 | 2015-11-26 | エルジー・ケム・リミテッド | 金属構造体およびこの製造方法{metalstructurebodyandmethodformanufacturingthesame} |
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JPWO2016140073A1 (ja) * | 2015-03-04 | 2018-03-01 | 株式会社カネカ | 導電層付き基板、タッチパネル用透明電極付き基板及びそれらの製造方法 |
CN107210092B (zh) * | 2015-03-04 | 2019-06-18 | 株式会社钟化 | 带导电层的基板、触摸面板用带透明电极的基板及它们的制造方法 |
US10353497B2 (en) | 2015-03-04 | 2019-07-16 | Kaneka Corporation | Substrate with conductive layers, substrate with touch-panel transparent electrodes, and method for fabricating same |
Also Published As
Publication number | Publication date |
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US7375292B2 (en) | 2008-05-20 |
KR20060118553A (ko) | 2006-11-23 |
TWI369689B (ja) | 2012-08-01 |
DE112004002419T5 (de) | 2006-11-23 |
JPWO2005060326A1 (ja) | 2007-12-13 |
US20070102192A1 (en) | 2007-05-10 |
TW200529245A (en) | 2005-09-01 |
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