JP2007233134A - Optical filter for display, method for manufacturing same, and display and plasma display panel equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter which is excellent in productivity and which has a contact electrode attached thereto. <P>SOLUTION: The optical filter for display has a conductive layer and a hard-coat layer sequentially disposed on one surface of a transparent film in this order and a near infrared ray absorbing layer disposed on the other surface of the transparent film, and is characterized in that the transparent film, the conductive layer, the hard-coat layer, and the near infrared ray absorbing layer are identical to one another in their shapes and areas, and layered so that the end faces thereof are flush with one another, and in that the conductive layer end face on at least a part of flush end faces of the layered body is a slope. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applicable to various displays such as a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescent) display, and a field emission display (FED) including a surface electric field display (SED). The present invention relates to an optical filter having various functions such as antireflection, near-infrared shielding, electromagnetic wave shielding, and the like, and a display provided with this optical filter, particularly a PDP.

  In the case of flat panel displays such as liquid crystal displays, plasma displays (PDP), EL displays, and CRT displays, it has been known that the light from the outside is reflected on the surface and the internal visual information is difficult to see. Various measures have been taken, such as the installation of an optical film including an antireflection film.

  In recent years, large-screen displays have become mainstream in displays, and PDPs have become common as next-generation large-screen display devices. However, in this PDP, high-frequency pulse discharge is performed on the light emitting unit for image display, which may cause unnecessary electromagnetic radiation and infrared radiation that may cause malfunction of the infrared remote controller. Thus, various antireflection films for PDP (electromagnetic wave shielding light transmitting window material) having conductivity have been proposed. As the conductive layer of this electromagnetic wave shielding light transmitting window material, for example, (1) a transparent film provided with a transparent conductive thin film containing metallic silver, and (2) a conductive mesh made of a metal wire or conductive fiber in a net shape are provided. Transparent film, (3) a layer of copper foil or the like on the transparent film is etched into a net-like shape, an opening is provided, and (4) a conductive ink is printed on the transparent film in a mesh shape, etc. Are known.

  Furthermore, in a large display such as a conventional PDP, various films such as an antireflection film and a near infrared cut film are bonded together. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 11-74683) discloses an electromagnetic wave shielding light transmitting window material in which a conductive mesh is interposed between two transparent substrates and bonded and integrated with a transparent adhesive resin. Are listed.

  In the electromagnetic wave shielding light transmitting window material, it is necessary to ground (ground) a conductive layer (electromagnetic wave shielding material), for example, a conductive mesh, in order to improve the electromagnetic wave shielding property by the conductive layer. There is. For this purpose, an electromagnetic wave shielding material protrudes from between two transparent substrates and is grounded by wrapping around the back side of the light transmitting window material laminate, or is in contact with the electromagnetic wave shielding material between two transparent substrates. Thus, it is necessary to sandwich the conductive adhesive tape. However, in such a method, there is a problem that the above work in the stacking process is complicated.

  Patent Document 2 (Japanese Patent Laid-Open No. 2001-142406) discloses a laminate in which a single transparent substrate, an electromagnetic wave shielding material, an outermost antireflection film, and a near infrared cut film are laminated and integrated. An electromagnetic wave comprising a body, a conductive pressure-sensitive adhesive tape is attached across the edge and front and back edges of the transparent substrate, and the conductive pressure-sensitive adhesive tape and the edge of the electromagnetic shielding material are attached by a conductive pressure-sensitive adhesive A shielding light-transmitting laminated film is described.

Japanese Patent Laid-Open No. 11-74683 JP 2001-142406 A

  For example, when producing an optical filter for a display such as the above-mentioned PDP using a long plastic film, a near-infrared cut film and an antireflection film are produced, and these are laminated via a conductive mesh for electromagnetic wave shielding. Thus, a long optical filter is obtained, and then cut into a rectangular shape in accordance with the shape of the display portion on the entire surface of each display. For this reason, the end faces of all the layers are exposed at the cut surface, that is, the end face (side face) of such an optical filter, but it is naturally only an extremely small area. The conductive mesh also has only a slight peek at the mesh-like cross section.

  If such an optical filter for display is used as it is and the conductive layer (for example, conductive mesh) can be grounded (grounded) to the PDP body in order to improve the electromagnetic wave shielding property by the conductive layer, it is extremely high. An optical filter for display that is easy to ground with productivity can be obtained.

  In the optical filter as described in Patent Document 2, it is necessary to bond the conductive adhesive tape across the end face and the front and back edges of the filter, and at that time, the adhesive tape is likely to be twisted or broken. In order to prevent these problems, the work is complicated, and it is necessary to protrude the conductive mesh from the end face.

  Accordingly, an object of the present invention is to provide an optical filter for a display which can be easily manufactured, has a good electromagnetic shielding property, and has an earth electrode which can be easily attached to the display and can be easily grounded. .

  The present invention also provides an optical filter for a display which can be easily manufactured, has a grounding electrode which is light and thin, has a good electromagnetic wave shielding property, and is easy to attach to the display and to be easily grounded. With the goal.

  Furthermore, the present invention provides an optical filter suitable for a PDP that can be easily manufactured, has a good electromagnetic shielding property, and has a ground electrode that can be easily mounted on a display and is easily grounded. Objective.

  Moreover, an object of this invention is to provide the manufacturing method of the said optical filter for displays.

  Furthermore, an object of the present invention is to provide a display in which the optical filter having the excellent characteristics is bonded to the surface of an image display glass plate.

  Furthermore, an object of the present invention is to provide a PDP in which the optical filter having the excellent characteristics is bonded to the surface of an image display glass plate.

Therefore, the present invention
An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
And an optical filter for display, wherein the conductive layer end face of at least a part of the end face of the laminate is an inclined surface;
An optical filter for display in which a conductive layer and a hard coat layer are provided in this order on one surface of a transparent film, and a near-infrared absorbing layer is provided on the other surface,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
And an optical filter for display, wherein the conductive layer end face of at least a part of the end face of the laminate is an inclined surface;
An optical filter for display in which a conductive layer and a near-infrared absorbing layer are provided in this order on one surface of a transparent film, and a hard coat layer is provided on the other surface,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
And an optical filter for display characterized in that the end face of the conductive layer on at least a part of the end face of the laminate is a slope; and a transparent film provided with a hard coat layer on one surface, and a conductive film on one surface. A display in which two transparent films are bonded to another transparent film provided with a layer in a state where the back surface of the former transparent film and the conductive layer of the latter transparent film face each other with an adhesive layer therebetween An optical filter,
Two transparent films, a conductive layer, and a hard coat layer are laminated together to form an end face,
And an optical filter for display, wherein the end face of the conductive layer in at least a part of the end face of the laminate is a slope;
It is in.

Preferred embodiments of the optical filter for display of the present invention are as follows.
(1) The shape of the transparent film, the conductive layer, and the hard coat layer, or the transparent film, the conductive layer, the hard coat layer, and the near-infrared absorbing layer are the same in shape and area, and are flush with the end face. Are stacked.
(2) The shape of the transparent film, the conductive layer, the hard coat layer, and the near infrared absorption layer is rectangular. It is a shape of a general optical filter for display.
(3) The angle of the slope is 30 to 60 degrees with respect to the normal to the conductive layer. 40 to 50 degrees is particularly preferable.
(4) The entire surface of at least one end face of the laminate is a slope. It is advantageous for manufacturing.
(5) In the above (2), at least the two end faces facing each other are slopes. All four sides are preferably slopes.
(6) An electrode portion is formed on the slope of the conductive layer exposed at the end face by a conductive material-containing adhesive or solder.
(7) The optical filter for display according to (6) above, wherein at least two opposite ends of the rectangular surface of the hard coat layer or the uppermost layer (eg, low refractive index layer) provided thereon A thin electrode portion is also formed in the region, and a long conductive tape is provided so that a part protrudes from the electrode portion in the end region, and at least a part of the protruding portion is an electrode portion on the slope. It is glued to. Easy to ground. Mounting on the display becomes easy.

In the above, the long conductive tape is adhered to the hard coat layer or the end region of at least the two sides facing each other in the uppermost layer provided thereon so that the sides and the longitudinal direction of the tape are parallel to each other. It is preferable.
(8) In an optical filter for display using two transparent films, it is preferable that a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a hard coat layer. Moreover, it is also preferable that the near-infrared absorption layer is provided in the whole back surface of the transparent film which has a conductive layer.
(9) The conductive layer is a mesh-like conductive layer. Excellent electromagnetic shielding properties.
(10) A low refractive index layer is further formed on the hard coat layer. Good antireflection properties can be obtained.
(11) A transparent adhesive layer is provided on the surface of the near-infrared absorbing layer opposite to the transparent film. Mounting on the display becomes easy. The near infrared absorbing layer may have adhesiveness.
(12) A hard coat layer is embedded in the mesh gap of the mesh-like conductive layer. Excellent transparency is obtained.
(13) The transparent film is a plastic film.
(13) A release sheet is provided on the transparent adhesive layer or the adhesive near-infrared absorbing layer. Mounting on the display becomes easy.
(14) A filter for a plasma display panel.

The display optical filter of the present invention can be advantageously obtained by the following production method:
A conductive layer is formed over the entire width of the long transparent film, and then a hard coat layer is formed over the entire width of the conductive layer, and then close to the full width of the back of the long transparent film. Forming an infrared absorption layer to form a laminate having a conductive layer, and further cutting the laminate in the width direction and obliquely with respect to a horizontal plane; and A long transparent film in which a hard coat layer is provided in this order on one surface, and another transparent film in which a near infrared absorption layer is provided on one surface and a conductive layer is provided on the other surface, Two transparent films are arranged such that the back surface of the former long transparent film and the conductive layer of another transparent film face each other with an adhesive layer therebetween, and a laminate is formed by bonding, Furthermore, the lamination A method for producing an optical filter for display, comprising: cutting a body in a width direction and obliquely with respect to a horizontal plane.

Furthermore, the present invention provides
A display characterized in that the optical filter for display is bonded to the surface of the image display glass plate; and a plasma characterized in that the optical filter for display is bonded to the surface of the image display glass plate It is also on the display panel.

  The optical filter for display according to the present invention is an optical filter that is easy to manufacture and has an inclined surface portion of a conductive layer as a contact portion for a ground electrode in an optical filter that is easy to manufacture. is there. For example, an optical filter that is easy to manufacture can be obtained by cutting a long laminate obtained by forming a conductive layer, an antireflection layer, a near-infrared absorbing layer, and the like on a long transparent film. However, it is possible to easily obtain an optical filter in which a ground electrode can be easily formed by cutting an elongated laminate obliquely. Therefore, it can be said that the optical filter for display according to the present invention is an optical filter in which a contact portion on which an earth electrode can be easily formed by a simple method is provided on an optical filter that is easily manufactured continuously.

  In particular, when the above optical filter is obtained using a single transparent film, the thickness of the optical filter becomes extremely small, and the mass decreases accordingly. It is advantageous.

  In addition, when an electrode or conductive tape is attached to this contact part and electrodes are provided on or around the two sides of the optical filter, grounding can be performed easily and stably, and can be attached to the display. Is even easier. In particular, when a conductive tape is further affixed to the electrode portion, the above characteristics are further improved.

  Therefore, the optical filter for display of the present invention includes a field emission display (FED) including a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescence) display, and a surface electric field display (SED). It can be said that the optical filter has various functions such as anti-reflection, near-infrared shielding, and electromagnetic wave shielding for various displays such as).

  The optical filter for a display with an electrode part, which is provided with the earth electrode contact part of the present invention and is excellent in productivity, will be described in detail below.

  FIG. 1 shows a schematic sectional view of an example showing the basic structure of the optical filter for display of the present invention. FIG. 1 is a sectional view of a part of a rectangular display optical filter 11 including one end. In FIG. 1, an antireflection layer 17 such as a conductive layer 13, a hard coat layer 16 and a low refractive index layer is provided in this order on one surface of a transparent film 12, and a near infrared absorbing layer 14 and A transparent adhesive layer 15 is provided thereon. And the end surface (side surface) of this laminated body is cut | disconnected diagonally, and forms the slope. In the present invention, at least the end surface of the conductive layer 13 needs to be a slope. The inclined surface of the present invention has an angle α between the inclined surface of the conductive layer 13 and a perpendicular to the conductive layer 13, and α is preferably 30 to 60 degrees, and particularly preferably 40 to 50 degrees. This angle α is shown in the partially enlarged view. In the present invention, the exposed conductive layer 13 is used as an electrode contact portion for forming an electrode portion. Thus, by making the end surface of the conductive layer 13 a slope, the exposed area can be greatly increased. For example, when a conductive paste is applied here, the coating is easy because of the slope, The increase in the contact area facilitates stable ground formation.

  It is preferable that at least one side, preferably two opposite sides, particularly preferably all four sides of the four rectangular pieces are slopes. When forming an optical filter using a long transparent film, after forming each layer, it is necessary to cut | disconnect the obtained elongate laminated body to the predetermined length in the width direction. By cutting in the oblique direction at the time of cutting in the width direction, inclined surfaces can be efficiently formed on the end faces of the two sides. Therefore, it is advantageous in manufacturing to form slopes on two sides. As a different method, only a conductive layer or a transparent film having a conductive layer may be cut obliquely in advance, and another layer or film may be laminated thereon.

  In this configuration, the positions of the antireflection layer 17 such as the hard coat layer 16 and the low refractive index layer, and the near-infrared absorbing layer 14 may be interchanged. Such a configuration is shown in FIG. In FIG. 2, a conductive layer 23, a near-infrared absorption layer 24, and a transparent adhesive layer 25 are provided in this order on one surface of the transparent film 22, and a hard coat layer 26, a low refractive index layer, and the like are provided on the other surface. An antireflection layer 27 is provided. And the end surface (side surface) of this laminated body is cut | disconnected diagonally, and the slope is formed. 1 may be provided between the conductive layer 13 and the hard coat layer 16. The near infrared absorption layer 14 shown in FIG.

  However, the configuration of FIG. 1 is advantageous because the conductive layer is present on the front surface (front surface side) of the display when the display is mounted, and thus grounding is easy to install.

  The conductive layer 13 is, for example, a mesh-like metal layer or metal-containing layer, a coating layer, a metal oxide layer (dielectric layer), or an alternately laminated film of metal oxide layers and metal layers. The mesh-like metal layer or metal-containing layer is generally formed by etching or printing, or is a metal fiber layer. This makes it easy to obtain low resistance. In general, the mesh gap of the mesh-like metal layer or metal-containing layer is filled with a hard coat layer 16 as shown in FIG. This improves transparency. When not filling with the hard-coat layer 16, it is preferable to fill with another layer, for example, the near-infrared absorption layer 14, or its own transparent resin layer.

  The antireflection layer 17 is generally a low refractive index layer. That is, the antireflection effect is exhibited by the composite film of the hard coat layer 16 and the low refractive index layer provided thereon. A high refractive index layer may be provided between the low refractive index layer and the hard coat layer 16. This improves the antireflection function.

  Further, the antireflection layer 17 may not be provided, and only the transparent film and the hard coat layer 16 having a refractive index higher or lower (preferably lower) than that of the transparent film may be used. The hard coat layer 16 and the antireflection layer 17 are preferably formed by coating from the viewpoints of productivity and economy.

  The near-infrared absorbing layer 14 has a function of blocking unnecessary light such as neon light emission of PDF. In general, it is a layer containing a dye having an absorption maximum at 800 to 1200 nm. The transparent adhesive layer 15 is generally provided for easy mounting on a display. A release sheet may be provided on the transparent adhesive layer 15.

  FIG. 3 shows a schematic sectional view of an example of a preferred embodiment of the optical filter for display of the present invention shown in FIG. FIG. 3 shows a cross-sectional view of a part of the rectangular display optical filter 21 including one end. FIG. 3 corresponds to a view when the conductive layer of FIG. 1 is a mesh conductive layer. In FIG. 3, an antireflection layer 37 such as a mesh-like conductive layer 33, a hard coat layer 36, and a low refractive index layer is provided in this order on one surface of a transparent film 32, and near-infrared absorption is provided on the other surface. The layer 34 and the transparent adhesive layer 35 are provided thereon. And the end surface (side surface) of this laminated body is cut | disconnected diagonally, and forms the slope. Here, the end surface of the mesh portion of the mesh-like conductive layer 13 is a slope. The inclined surface of the present invention has an angle α between the inclined surface of the conductive layer 33 and a perpendicular to the conductive layer 33. α is preferably 30 to 60 degrees, and particularly preferably 40 to 50 degrees. This angle α is shown in the partially enlarged view. In the present invention, the exposed mesh portion of the conductive layer 33 is used as an electrode contact portion for forming an electrode portion. Thus, by making the end face of the mesh portion of the conductive layer 33 a slope, the exposed area can be greatly increased. For example, when a conductive paste is applied here, the coating is easy because of the slope. In addition, the increase in the contact area facilitates stable ground formation.

  In FIG. 3, since a mesh-like metal layer is used as the conductive layer, the electromagnetic wave shielding effect and the like are particularly excellent. The mesh gap of the mesh-like metal layer is filled with the hard coat layer 36, thereby improving transparency.

  FIG. 4 shows a schematic sectional view of an example of a preferred embodiment of the optical filter for display of the present invention. FIG. 4 shows the display optical filter 41 in which the electrode portion 48 is formed on the exposed slope of the mesh-like conductive layer formed on the end face of the rectangular display optical filter of FIG. That is, in FIG. 4, an antireflection layer 47 such as a mesh-like conductive layer 43, a hard coat layer 46, and a low refractive index layer is provided in this order on one surface of the transparent film 42, and close to the other surface. An infrared absorption layer 44 and a transparent pressure-sensitive adhesive layer 45 are provided thereon. And the end surface (side surface) of this laminated body is cut | disconnected diagonally, and forms the slope. Here, the end surface of the mesh portion of the mesh-like conductive layer 43 is a slope. Furthermore, an electrode portion (generally a ground electrode) 48 is formed on the slope including the mesh portion. The electrode part 48 is generally formed of a conductive material-containing adhesive or solder. Or you may affix the conventional conductive tape with an adhesive so that the at least mesh-shaped conductive layer 43 exposed to the end surface may be covered.

  The electrode part 38 made of the conductive paste or solder is advantageous in that it is easy to ground by forming up to the surface of the end part of the adjacent antireflection layer 17 and the surface of the end part of the adjacent transparent adhesive layer 15. There is. However, as shown in FIGS. 5 and 7 to be described later, when a conductive tape is used, it is preferable to contact the electrode portion 38 in order to adhere the tape. In general, the electrode portions 38 need to be provided on at least opposite end faces, and are preferably provided on all end faces of the four sides. This facilitates grounding and enables stable grounding.

  The electrode portion 48 is generally a ground electrode and covers at least the conductive layer 43 exposed on the end surface (slope), preferably the entire end surface including other layers and films. Further, it is particularly preferable that the electrode portion covers the four end faces of the film, that is, the entire periphery. The width (thickness) of the electrode part 48 (L in FIG. 4) is generally 5 μm or more, preferably 5 μm to 20 mm. If it is less than this range, it will be difficult to ground, and if it exceeds this range, it will hinder dimensional alignment. The length of the film in the thickness direction (d in FIG. 4) is generally 80 μm or more, and is set within the dimension range of the structure of the optical filter for display. The electrode portion 38 is generally formed of paste or solder containing a conductive material.

  FIG. 5 shows a schematic sectional view of an example of a preferred embodiment of the optical filter for display of the present invention. FIG. 5 shows the display optical filter 51 to which a conductive tape is attached so as to be in contact with the electrode portion formed on the end face of the rectangular display optical filter of FIG. That is, in FIG. 5, an antireflection layer 57 such as a mesh-like conductive layer 53, a hard coat layer 56, and a low refractive index layer is provided in this order on one surface of the transparent film 52, and close to the other surface. An infrared absorption layer 54 and a transparent adhesive layer 55 are provided thereon. An electrode portion (generally a ground electrode) 58 is formed on the end face of the laminate. The electrode portion 58 covers a slope including at least the mesh-like conductive layer 53 exposed at the end face. Then, a conductive tape 59 is installed at the end of the surface of the antireflection layer 57, which is bonded to a part of the electrode portion 58. By using this conductive tape 59, it becomes very easy to ground. The conductive tape 59 is preferably slightly protruded by bonding the surfaces of the adjacent electrode portions 58, but there is no limitation on the shape of the tape as long as it is in contact with a part of the electrode portions 58. However, it is preferable that a long conductive tape 59 is installed in the end region of the antireflection layer 57 so that the sides and the longitudinal direction of the tape are parallel to each other. In order to bond the conductive tape 59, the adhesive property of the upper part of the electrode part 58 is used. In the end region of the surface of the antireflection layer 57, the conductive tape is attached using a double-sided tape made of aluminum or the like. It may be adhered.

  The conductive tape 59 is provided in the end regions of at least two opposing sides, but may be provided on all four sides. In FIG. 5, the long conductive tape 59 is provided on the antireflection layer 57, but is provided on the uppermost layer. If the uppermost layer is a hard coat layer, it is provided on the uppermost layer.

  FIG. 6 is a plan view of the display optical filter 51 of FIG. 5 viewed from the antireflection layer side. Up to the dotted line is the antireflection layer 57, that is, the laminate, and the conductive tape 59 almost covers the antireflection layer 57, and a part of the portion outside the dotted line covers the electrode part 58. In general, the outer conductive tape 49 is grounded. The width of the conductive tape 59 is generally 5 to 100 mm. The protruding width (distance from the dotted line) of the conductive tape 49 is generally 0.5 to 50 mm.

  FIG. 7 shows a schematic cross-sectional view of an example of another embodiment of the optical filter for display according to the present invention. FIG. 7 shows a display optical filter 61 in the case where two transparent films are used in the rectangular display optical filter of FIG. That is, in FIG. 7, an antireflection layer 67 such as a hard coat layer 66 and a low refractive index layer is provided in this order on the surface of the transparent film 62A, and a mesh-like conductive layer 63 is provided on the surface of another transparent film 62B. Is provided with a near-infrared absorbing layer 64 and a transparent adhesive layer 65 thereon, a surface on which the transparent film 62A layer is not provided, and a conductive layer 63 of the transparent film 62B. It is bonded via 60. As in FIG. 5, an electrode portion (generally a ground electrode) 68 is formed on the end face of the laminate. The electrode portion 68 covers a slope including at least the mesh-like conductive layer 63 exposed at the end face. Then, a conductive tape 69 is installed at the end of the surface of the antireflection layer 67 by being bonded at a part of the electrode portion 68. By using this conductive tape 69, it becomes very easy to ground. The conductive tape 69 is preferably slightly protruded by bonding the surfaces of the adjacent electrode portions 68, but the shape of the tape is not limited as long as it is in contact with a part of the electrode portions 68. However, it is preferable that a long conductive tape 69 is bonded to the end region of the antireflection layer 67 so that the sides and the longitudinal direction of the tape are parallel to each other.

  The two transparent films are employed when it is advantageous in terms of production, but are disadvantageous in that they are bulky because the thickness is increased.

In the above-described optical filter for display, a conductive layer is formed on the entire length of the long transparent film, and then a hard coat layer is formed on the conductive layer in the width direction. By forming a near-infrared absorbing layer on the back side in the full width direction to form a laminate having a conductive layer, and further cutting the laminate in the width direction and obliquely with respect to the horizontal plane; Two transparent films: a long transparent film having a hard coat layer on the surface, and another transparent film having a near infrared absorption layer on one surface and a conductive layer on the other surface In the state where the back surface of the former long transparent film and the conductive layer of the latter long transparent film are opposed to each other, a laminated body is formed by bonding through an adhesive layer. Horizontal and horizontal It can be advantageously obtained by cutting obliquely with respect to the surface.

  In the case of a rectangular transparent film, each layer may be formed in a batch system. However, as described above, it is preferable to form each layer on a continuous film, in a roll-to-roll system, and to cut the layers.

  The material used for the optical filter for display of this invention is demonstrated below.

  The material of the transparent film is not particularly limited as long as it is transparent (meaning “transparent to visible light”), but a plastic film is generally used. For example, polyester {eg, polyethylene terephthalate (PET), polybutylene terephthalate}, polymethyl methacrylate (PMMA), acrylic resin, polycarbonate (PC), polystyrene, triacetate resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, Examples thereof include ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane and the like. Among these, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), etc. are highly resistant to loads during processing (heat, solvent, bending, etc.) and particularly highly transparent. preferable. In particular, PET is preferable because it has excellent processability.

  The thickness of the transparent film varies depending on the use of the optical filter, but is generally 1 μm to 10 mm, 1 μm to 5 mm, and particularly preferably 25 to 250 μm.

  The conductive layer of the present invention is set so that the surface resistance value of the obtained optical filter is generally 10Ω / □ or less, preferably 0.001 to 5Ω / □, particularly 0.005 to 5Ω / □. Is done. A mesh-like conductive layer is also preferable. Alternatively, the conductive layer may be a coating layer or a layer obtained by a vapor deposition method (a transparent conductive thin film of metal oxide (ITO or the like)). Further, it may be an alternate laminate of a metal oxide dielectric film such as ITO and a metal layer such as Ag (eg, ITO / silver / ITO / silver / ITO laminate).

  As the mesh-like conductive layer, metal fibers and metal-coated organic fiber metals made into a mesh, copper foil on a transparent film etched into a mesh and provided with openings, conductive on the transparent film And the like, in which a conductive ink is printed in a mesh shape.

  In the case of a mesh-shaped conductive layer, the mesh preferably has a wire diameter of 1 μm to 1 mm and an aperture ratio of 40 to 95% made of metal fibers and / or metal-coated organic fibers. A more preferable wire diameter is 10 to 500 μm, and an aperture ratio is 50 to 95%. When the wire diameter exceeds 1 mm in the mesh-like conductive layer, the electromagnetic wave shielding property is improved, but the aperture ratio is lowered and cannot be made compatible. If it is less than 1 μm, the strength as a mesh is lowered and handling becomes difficult. Further, when the aperture ratio exceeds 95%, it is difficult to maintain the shape as a mesh. When the aperture ratio is less than 40%, the light transmittance is reduced, and the amount of light from the display is also reduced.

  The opening ratio of the conductive mesh refers to the area ratio occupied by the opening portion in the projected area of the conductive mesh.

  The metal fibers constituting the mesh-like conductive layer and the metal of the metal-coated organic fiber include copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, lead, iron, silver, carbon or alloys thereof, preferably copper, Stainless steel and nickel are used.

  As the organic material for the metal-coated organic fiber, polyester, nylon, vinylidene chloride, aramid, vinylon, cellulose and the like are used.

  When a conductive foil such as a metal foil is subjected to pattern etching, copper, stainless steel, aluminum, nickel, iron, brass, or an alloy thereof, preferably copper, stainless steel, or aluminum is used as the metal of the metal foil.

  If the thickness of the metal foil is too thin, it is not preferable in terms of handleability and workability of pattern etching, and if it is too thick, it affects the thickness of the film obtained, and the time required for the etching process becomes long. The thickness is preferably about 1 to 200 μm.

  The shape of the etching pattern is not particularly limited, and examples thereof include a grid-like metal foil in which square holes are formed, and a punching metal-like metal foil in which circular, hexagonal, triangular or elliptical holes are formed. It is done. Further, the holes are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this metal foil is 20 to 95%.

  Alternatively, the mesh-like conductive layer may be formed by pattern printing of conductive ink on a transparent substrate. Using the following conductive ink, it can be printed on the surface of the transparent substrate by screen printing, ink jet printing, electrostatic printing or the like.

  In general, carbon black particles having a particle size of 100 μm or less, or particles of a conductive material such as particles of metals or alloys such as copper, aluminum, nickel, etc. are bound to a binder of PMMA, polyvinyl acetate, epoxy resin or the like at a concentration of 50 to 90% by weight. Dispersed in resin. This ink is diluted or dispersed at a suitable concentration in a solvent such as toluene, xylene, methylene chloride, water, etc., applied to the surface of the transparent substrate by printing, and then dried at room temperature to 120 ° C. as necessary. Apply. Particles obtained by covering the same conductive material particles as described above with a binder resin are directly applied by electrostatic printing and fixed by heat or the like.

  The thickness of the printed film formed in this way is not preferable because the electromagnetic wave shielding property is insufficient if it is too thin, and if it is too thick, it affects the thickness of the resulting film, so it is about 0.5 to 100 μm. It is preferable to do this.

  According to such pattern printing, the degree of freedom of the pattern is large, and a conductive layer having an arbitrary wire diameter, interval and opening shape can be formed. Therefore, a plastic film having desired electromagnetic wave shielding properties and light transmission properties Can be easily formed.

  There is no particular limitation on the pattern printing shape of the conductive layer. For example, a grid-like printed film having a rectangular opening or a punching metal shape having a circular, hexagonal, triangular or elliptical opening. Examples include printed films. Further, the openings are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this printed film is 20 to 95%.

  In addition to the above, as a mesh-like conductive layer, dots are formed on the film surface by a material soluble in a solvent, and a conductive material layer made of a conductive material insoluble in a solvent is formed on the film surface, A mesh-like conductive layer obtained by contacting the film surface with a solvent to remove the dots and the conductive material layer on the dots may be used.

  Examples of the conductive layer by coating include a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer.

  Examples of the inorganic compound constituting the conductive particles include metals, alloys such as aluminum, nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, copper, titanium, cobalt, lead; or ITO, oxidation Indium, tin oxide, zinc oxide, indium oxide-tin oxide (ITO, so-called indium-doped tin oxide), tin oxide-antimony oxide (ATO, so-called antimony-doped tin oxide), zinc oxide-aluminum oxide (ZAO; so-called aluminum-doped oxide) And conductive oxides such as zinc). In particular, ITO is preferable. The average particle size is preferably 10 to 10,000 nm, particularly preferably 10 to 50 nm.

  Examples of the polymer include acrylic resin, polyester resin, epoxy resin, urethane resin, phenol resin, maleic acid resin, melamine resin, urea resin, polyimide resin, and silicon-containing resin. Furthermore, it is preferable that it is a thermosetting resin among these resins.

  Alternatively, the polymer is particularly preferably an ultraviolet curable resin used for a hard coat layer described later.

  The conductive layer is formed by coating by dispersing the conductive fine particles in a polymer (using a solvent if necessary) by mixing or the like to prepare a coating solution, and coating the coating solution on a transparent substrate. And then drying and curing as appropriate. In the case of using a thermoplastic resin, it is obtained by drying after coating, and in the case of a thermosetting type, it is obtained by drying and thermosetting. When an ultraviolet curable resin is used, it can be obtained by drying after application and irradiating with ultraviolet rays after coating.

  The thickness of the conductive layer formed by coating is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic wave shielding property may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  The conductive layer of the present invention is also preferably a conductive polymer layer formed by coating. For example, hydrocarbon polymers such as polyacetylene, polyphenylene, polyphenylene vinylene, polyacene, polyphenylacetylene, polynaphthalene; heteroatom-containing polymers such as polypyrrole, polyaniline, polythiophene, polyethylene vinylene, polyazulene, polyisothianaphthene . Polypyrrole and polythiophene are preferred. The thickness of the light conductive layer of the conductive polymer is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic wave shielding property may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  When the conductive layer is formed by a vapor deposition method (metal oxide layer), the formation method is not particularly limited, but a vapor phase such as sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition, etc. Examples of the method include a film forming method, printing, and coating, but a gas phase film forming method (sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition) is preferable. A conductive layer can be formed using the inorganic compound. When the conductive layer is formed by a vapor deposition method, the layer thickness is preferably 30 to 50000 nm, particularly about 50 nm.

  A metal plating layer may be further provided on the conductive layer in order to improve conductivity. The metal plating layer can be formed by a known electrolytic plating method or electroless plating method. As the metal used for plating, generally, copper, copper alloy, nickel, aluminum, silver, gold, zinc, tin or the like can be used, preferably copper, copper alloy, silver, or nickel, In particular, it is preferable to use copper or a copper alloy from the viewpoint of economy and conductivity.

  Further, the conductive layer may be an alternately laminated film of a dielectric layer (metal oxide) and a metal layer. In particular, a laminate of 5 layers or more of dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer is preferable. For example, an alternate laminate of a dielectric layer of a metal oxide such as ITO and a metal layer of Ag or the like (eg, a laminate of ITO / silver / ITO / silver / ITO) can be used.

  The transparent conductive film can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  In order to improve the electromagnetic wave shielding effect by further reducing the resistance value of the conductive layer (particularly the mesh-shaped conductive layer), it is preferable to form a plating layer on the conductive layer.

  Examples of materials used for the plating process include copper, nickel, chromium, zinc, tin, silver, and gold. These may be used alone or as two or more kinds of alloys. The plating process is generally performed by ordinary liquid phase plating (electroplating, electroless plating, etc.).

  Moreover, you may give anti-glare performance. When this anti-glare treatment is performed, a blackening treatment may be performed on the surface of the (mesh) conductive layer. For example, oxidation treatment of a metal film, black plating such as chromium alloy, application of black or dark ink, and the like can be performed.

  The antireflection layer of the present invention is generally a composite film of a hard coat layer having a refractive index lower than that of a transparent film as a substrate and a low refractive index layer provided thereon, or a hard coat layer and a low refractive index layer. Is a composite film in which a high refractive index layer is further provided therebetween. Even if the antireflection layer is only a hard coat layer having a refractive index lower than that of the substrate, it is effective. However, when the refractive index of the substrate is low, a composite film of a hard coat layer having a higher refractive index than the transparent film and a low refractive index layer provided thereon, or a higher refractive index layer is provided on the low refractive index layer. A composite film obtained may be used.

  As a hard-coat layer, an acrylic resin layer, an epoxy resin layer, a urethane resin layer, a silicone resin layer, etc. can be mentioned, The thickness is 1-50 micrometers normally, Preferably it is 1-10 micrometers. Either a thermosetting resin or an ultraviolet curable resin may be used, but an ultraviolet curable resin is preferable.

  Examples of the thermosetting resin include phenol resin, resorcinol resin, urea resin, melamine resin, epoxy resin, acrylic resin, urethane resin, furan resin, and silicon resin.

  Examples of the ultraviolet curable resin (monomer, oligomer) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-ethylhexyl polyethoxy (meth) acrylate. , Benzyl (meth) acrylate, isobornyl (meth) acrylate, phenyloxyethyl (meth) acrylate, tricyclodecane mono (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acryloylmorpholine , N-vinylcaprolactam, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, o-phenylphenyloxyethyl (meth) acrylate, neopentylglyce Di (meth) acrylate, neopentyl glycol dipropoxy di (meth) acrylate, neopentyl glycol di (meth) acrylate hydroxypivalate, tricyclodecane dimethylol di (meth) acrylate, 1,6-hexanediol di (meth) Acrylate, nonanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate, ditrimethylolpropane (Meth) acrylate monomers such as tetra (meth) acrylate; polyol compounds (for example, ethylene glycol, propylene glycol, neopentyl glycol, , 6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 2-ethyl-2-butyl-1,3-propanediol, trimethylolpropane, diethylene glycol, dipropylene glycol, polypropylene Polyols such as glycol, 1,4-dimethylolcyclohexane, bisphenol A polyethoxydiol, polytetramethylene glycol, the polyols and succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, isophthalic acid Polyester polyols which are reaction products of polybasic acids such as acid and terephthalic acid or acid anhydrides thereof, polycaprolactone polyols which are reaction products of the polyols and ε-caprolactone, the polyols and the above, Polybasic acid or this Reaction products of these acid anhydrides with ε-caprolactone, polycarbonate polyols, polymer polyols, etc.) and organic polyisocyanates (for example, tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, diisocyanate) Cyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethylhexamethylene diisocyanate, 2,2′-4-trimethylhexamethylene diisocyanate, etc.) and a hydroxyl group-containing (meth) acrylate (for example, 2-hydroxyethyl (meta ) Acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylic Rate, cyclohexane-1,4-dimethylol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin di (meth) acrylate, etc.) (Meth) such as bisphenol type epoxy (meth) acrylate, which is a reaction product of bisphenol type epoxy resin such as polyurethane (meth) acrylate, bisphenol A type epoxy resin, bisphenol F type epoxy resin and (meth) acrylic acid which is a reaction product Examples include acrylate oligomers. These compounds can be used alone or in combination. These ultraviolet curable resins may be used as a thermosetting resin together with a thermal polymerization initiator.

  For the hard coat layer, among the above-mentioned ultraviolet curable resins (monomers and oligomers), hard materials such as pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate are used. It is preferable to mainly use polyfunctional monomers.

  Any compound suitable for the properties of the ultraviolet curable resin can be used as the photopolymerization initiator for the ultraviolet curable resin. For example, acetophenone such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1 Benzoin series such as benzyldimethyl ketal, benzophenone, 4-phenylbenzophenone, benzophenone series such as hydroxybenzophenone, thioxanthone series such as isopropylthioxanthone, 2-4-diethylthioxanthone, and other special ones include methylphenyl glyoxylate Etc. can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may be optionally selected from one or more known photopolymerization accelerators such as benzoic acid type or tertiary amine type such as 4-dimethylaminobenzoic acid. It can be used by mixing at a ratio. Moreover, it can be used by 1 type, or 2 or more types of mixture of only a photoinitiator. Particularly preferred is 1-hydroxycyclohexyl phenyl ketone (Irgacure 184, manufactured by Ciba Specialty Chemicals).

  The quantity of a photoinitiator is 0.1-10 mass% with respect to a resin composition, Preferably it is 0.1-5 mass%.

  The hard coat layer preferably has a refractive index lower than that of the transparent film. By using the ultraviolet curable resin, a refractive index lower than that of the substrate is generally easily obtained. Therefore, it is preferable to use a material having a high refractive index such as PET as the transparent substrate. Therefore, the hard coat layer preferably has a refractive index of 1.60 or less. The film thickness is as described above.

The high refractive index layer is made of, for example, ITO, ATO, Sb ₂ O ₃ , SbO ₂ , In ₂ O ₃ , SnO ₂ , ZnO, Al-doped ZnO, TiO ₂ or the like in a polymer (preferably UV curable resin). It is preferable to use a layer in which conductive metal oxide fine particles (inorganic compound) are dispersed. The metal oxide fine particles preferably have an average particle size of 10 to 10,000 nm, preferably 10 to 50 nm. In particular, ITO (especially having an average particle diameter of 10 to 50 nm) is preferable. Those having a refractive index of 1.64 or more are suitable. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  When the high refractive index layer is a conductive layer, the minimum reflectance of the surface reflectance of the antireflection film is set within 1.5% by setting the refractive index of the high refractive index layer 2 to 1.64 or more. The minimum reflectance of the surface reflectance of the antireflection film can be made to be within 1.0% by setting it to 1.69 or more, preferably 1.69 to 1.82.

  The low refractive index layer is a layer (cured) in which fine particles such as silica and fluororesin, preferably hollow silica, are dispersed in a polymer (preferably UV curable resin) in an amount of 10 to 60% by weight (preferably 10 to 50% by weight). Layer). The refractive index of this low refractive index layer is preferably 1.40 to 1.51. When the refractive index is more than 1.51, the antireflection property of the antireflection film is deteriorated. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  As the hollow silica, those having an average particle diameter of 10 to 100 nm, preferably 10 to 50 nm, and a specific gravity of 0.5 to 1.0, preferably 0.8 to 0.9 are preferable.

  The hard coat layer preferably has a visible light transmittance of 85% or more. Both the visible light transmittance of the high refractive index layer and the low refractive index layer are preferably 85% or more.

  When the antireflection layer is composed of the above three layers, for example, the thickness of the hard coat layer is 2 to 20 μm, the thickness of the high refractive index layer is 75 to 200 nm, and the thickness of the low refractive index layer is 75 to 200 nm. Preferably there is.

  In order to form each layer of the antireflection layer, as described above, the polymer (preferably UV curable resin) is blended with the fine particles as necessary, and the obtained coating solution is applied, and then dried. If necessary, it is heat-cured, or after coating, if necessary, it is dried and irradiated with ultraviolet rays. In this case, each layer may be applied and cured one by one, or all the layers may be applied and then cured together.

  As a specific method of coating, a method of coating a coating solution in which an ultraviolet curable resin containing an acrylic monomer or the like is made into a solution with a solvent such as toluene is coated with a gravure coater, and then dried, and then cured by ultraviolet rays. Can be mentioned. This wet coating method has the advantage that the film can be uniformly formed at high speed at low cost. After this coating, for example, by irradiating and curing with ultraviolet rays, the effect of improving the adhesion and increasing the hardness of the film can be obtained. The conductive layer can be formed similarly.

  In the case of ultraviolet curing, many light sources that emit light in the ultraviolet to visible range can be used as the light source, such as ultra-high pressure, high pressure, low pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp, mercury lamp, carbon arc lamp, incandescent lamp. And laser light. The irradiation time cannot be determined unconditionally depending on the type of lamp and the intensity of the light source, but is about several seconds to several minutes. Moreover, in order to accelerate curing, the laminate may be preheated to 40 to 120 ° C. and irradiated with ultraviolet rays.

  The antireflection layer of the present invention is preferably formed by coating as described above, but may be formed by a vapor phase film forming method. Usually, the high refractive index layer and the low refractive index layer can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  Examples of the combination of the high refractive index layer and the low refractive index layer include the following.

(A) 1 layer each in the order of high refractive index layer / low refractive index layer, laminated in a total of 2 layers, (b) 2 layers of high refractive index layer / low refractive index layer alternately, 4 layers in total (C) One layer each in the order of medium refractive index layer / high refractive index layer / low refractive index layer, laminated in a total of three layers, (d) high refractive index layer / low refractive index layer In this order, each layer is alternately stacked in 3 layers for a total of 6 layers. As the high refractive index layer, ITO (tin indium oxide) or ZnO, a thin film of ZnO, TiO ₂ , SnO ₂ , ZrO or the like doped with Al can be employed. As the low refractive index layer, a thin film having a refractive index of 1.6 or less, such as SiO ₂ , MgF ₂ , Al ₂ O _3, or the like can be used.

  The high refractive index layer, the low refractive index layer, and the like can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  A near-infrared absorption layer is generally obtained by forming a layer containing a pigment or the like on the surface of a transparent film. The near-infrared absorbing layer can be obtained, for example, by applying a coating solution containing an ultraviolet curable or electron beam curable resin containing the pigment and the binder resin, and drying and curing if necessary. When used as a film, it is generally a near-infrared cut film, such as a film containing a pigment or the like. The dye generally has an absorption maximum at a wavelength of 800 to 1200 nm. Examples include phthalocyanine dyes, metal complex dyes, nickel dithiolene complex dyes, cyanine dyes, squarylium dyes, polymethine dyes, Examples thereof include azomethine dyes, azo dyes, polyazo dyes, diimonium dyes, aminium dyes, and anthraquinone dyes, and cyanine dyes and squarylium dyes are particularly preferable. These dyes can be used alone or in combination. Examples of the binder resin include thermoplastic resins such as acrylic resins.

  In the present invention, the near-infrared absorbing layer may be provided with a function of adjusting color tone by providing a function of absorbing neon light emission. For this purpose, a neon-emission absorption layer may be provided, but a neon-emission selective absorption dye may be included in the near-infrared absorption layer.

  Neon luminescent selective absorption dyes include cyanine dyes, squarylium dyes, anthraquinone dyes, phthalocyanine dyes, polymethine dyes, polyazo dyes, azurenium dyes, diphenylmethane dyes, and triphenylmethane dyes. it can. Such a selective absorption dye is required to have a selective absorption of neon emission near 585 nm and a small absorption at other visible light wavelengths, so that the absorption maximum wavelength is 575 to 595 nm and the absorption spectrum half width is What is 40 nm or less is preferable.

  Also, when combining multiple types of near-infrared or neon luminescent absorbing dyes, if there is a problem with the solubility of the dye, if there is a reaction between the dyes due to mixing, if there is a decline in heat resistance, moisture resistance, etc. All the near-infrared absorbing dyes need not be contained in the same layer, and may be contained in another layer.

  Further, as long as the optical properties are not greatly affected, coloring pigments, ultraviolet absorbers, antioxidants and the like may be further added.

  As a near-infrared absorption characteristic of the optical filter of the present invention, it is preferable that the transmittance at 850 to 1000 nm is 20% or less, and further 15%. Moreover, as selective absorptivity, it is preferable that the transmittance | permeability of 585 nm is 50% or less. Especially in the former case, there is an effect of reducing the transmittance in a wavelength region where malfunction of a remote controller of a peripheral device is pointed out. In the latter case, an orange color having a peak at 575 to 595 nm is color reproducibility. This has the effect of absorbing the orange wavelength, thereby improving the redness and improving the color reproducibility.

  The layer thickness of the near infrared absorbing layer is generally 0.5 to 50 μm.

  The electrode portion used in the present invention is preferably formed from a conductive material-containing adhesive or solder.

  The conductive material-containing adhesive (conductive paste) is obtained by dispersing a metal powder of copper, silver, nickel or the like (preferably silver or silver-copper alloy) in a synthetic resin (and an appropriate organic solvent). The average particle size of the metal powder is generally 0.001 to 100 μm, in particular 0.01 to 50 μm. As the synthetic resin, an acrylic resin, a polyester resin, an epoxy resin, and an acrylic urethane resin are preferable, and an acrylic resin and a polyester resin are particularly preferable. The synthetic resin may be thermoplastic or thermosetting. The ratio of the metal powder to the total solid content is preferably in the range of 10 to 95% by mass, particularly 30 to 90% by mass.

The electrode part is formed with the conductive material-containing adhesive. The electrode part forming coating includes a synthetic resin in which metal powder is dispersed on the end face of the transparent film having the conductive layer, the hard coat layer, the near-infrared absorbing layer, and the like of the present invention. It is obtained by coating (applying) the working liquid and drying and / or curing at room temperature to 150 ° C. for 1 minute to 5 hours. The thickness (width direction of the transparent film) of the obtained second electrode part is generally 5 to 500 μm, and particularly preferably 10 to 200 μm. The conductivity of the obtained electrode part is preferably in the range of 1 × 10 ⁻⁶ to 1 × 10 ⁻² Ω · cm.

  Examples of commercially available electrode part-forming coating solutions include Doutite XA-9015, Doutite XE-9000, Doutite FE107, Doutite FN-101 (manufactured by Fujikura Kasei Co., Ltd.), ECM-100, VI7901 (and above). Solar Ink Co., Ltd.), DW-114L-1, DW-250H-5 (Toyobo Co., Ltd.).

The solder is generally composed of Sn and Pb, and Pb-free solder, for example, Sn-Ag, Sn-Cu, Sn-Bi, Sn-Ag-Cu, Sn-Ag-Bi, Sn-Ag. -Cu-Bi system, Sn-Zn-Bi system, etc. can be used. In the present invention, Pb-free solder is preferable. Those having a melting point of 190 to 250 ° C are preferred. Soldering can be performed using methods such as flow soldering, reflow soldering, and hand soldering. The thickness of the electrode part of the obtained solder is generally 5 to 500 μm, and particularly preferably 10 to 200 μm. The conductivity of the obtained electrode part is preferably in the range of 1 × 10 ⁻⁶ to 1 × 10 ⁻² Ω · cm.

  The conductive tape is generally a metal foil, and for example, a foil of copper, silver, nickel, aluminum, stainless steel or the like can be used, and the thickness is usually 1 to 100 μm. The thickness of this conductive tape is usually 5 to 100 μm.

  As a conventional adhesive conductive adhesive tape, an adhesive layer in which conductive particles are dispersed is provided on one surface of a metal foil, and this adhesive layer includes acrylic, rubber, silicon What mixed the hardening | curing agent with the adhesive, epoxy type, and phenol-type resin can be used.

  The transparent adhesive layer of the present invention is a layer for adhering the optical film of the present invention to a display, and any resin can be used as long as it has an adhesive function. For example, acrylic adhesives, rubber adhesives, SEBS (styrene / ethylene / butylene / styrene) and SBS (styrene / butadiene / styrene) and other thermoplastic elastomers (TPE) as main components TPE-based pressure-sensitive adhesives and adhesives can also be used.

  The layer thickness is generally in the range of 5 to 500 μm, particularly 10 to 100 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When two transparent films are used in the present invention, for example, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, acrylic resin (eg, ethylene- (meth) acrylic acid copolymer) Polymer, ethylene- (meth) ethyl acrylate copolymer, ethylene- (meth) methyl acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer), partially saponified ethylene-vinyl acetate copolymer Examples thereof include ethylene copolymers such as a polymer, a carboxylated ethylene-vinyl acetate copolymer, an ethylene- (meth) acryl-maleic anhydride copolymer, and an ethylene-vinyl acetate- (meth) acrylate copolymer. ("(Meth) acryl" means "acryl or methacryl"). In addition, polyvinyl butyral (PVB) resin, epoxy resin, phenol resin, silicon resin, polyester resin, urethane resin, rubber adhesive, thermoplastic elastomers such as SEBS and SBS can be used, but good adhesion Acrylic resin adhesives and epoxy resins are easily obtained.

  The layer thickness is generally 10 to 50 μm, preferably 20 to 30 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When EVA is also used as the material for the transparent pressure-sensitive adhesive layer, EVA has a vinyl acetate content of 5 to 50% by weight, preferably 15 to 40% by weight. When the vinyl acetate content is less than 5% by weight, there is a problem in transparency, and when it exceeds 40% by weight, the mechanical properties are remarkably deteriorated and the film formation becomes difficult and the films are easily blocked.

  As the cross-linking agent, an organic peroxide is suitable for heat cross-linking and is selected in consideration of sheet processing temperature, cross-linking temperature, storage stability, and the like. Examples of peroxides that can be used include 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3; -Butyl peroxide; t-butylcumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide; α, α'-bis (t-butylperoxyisopropyl) ) Benzene; n-butyl-4,4-bis (t-butylperoxy) valerate; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; , 1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; Luperoxyacetate; 2,5-dimethyl-2,5-bis (tertiarybutylperoxy) hexyne-3; 1,1-bis (tertiarybutylperoxy) -3,3,5-trimethylcyclohexane; 1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisperoxybenzoate; tert-butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl Peroxides; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used singly or in combination of two or more, and are usually used at a ratio of 5 parts by mass or less, preferably 0.5 to 5.0 parts by mass with respect to 100 parts by weight of EVA. .

  The organic peroxide is usually kneaded with EVA using an extruder, a roll mill or the like, but may be dissolved in an organic solvent, a plasticizer, a vinyl monomer or the like and added to the EVA film by an impregnation method.

  Various acryloxy group or methacryloxy group and allyl group-containing compounds can be added to improve EVA physical properties (mechanical strength, optical properties, adhesiveness, weather resistance, whitening resistance, crosslinking speed, etc.). . As the compound used for this purpose, acrylic acid or methacrylic acid derivatives, for example, esters and amides thereof are the most common. As the ester residue, in addition to alkyl groups such as methyl, ethyl, dodecyl, stearyl, lauryl, cyclohexyl groups , Tetrahydrofurfuryl group, aminoethyl group, 2-hydroxyethyl group, 3-hydroxypropyl group, 3-chloro-2-hydroxypropyl group and the like. Further, esters with polyfunctional alcohols such as ethylene glycol, triethylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol can also be used. A typical amide is diacetone acrylamide.

  Examples thereof include polyfunctional esters such as acrylic or methacrylic acid esters such as trimethylolpropane, pentaerythritol, glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, diallyl maleate, etc. Examples include allyl group-containing compounds. These are used alone or in combination of two or more, and are usually used in an amount of 0.1 to 2 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of EVA. .

  When EVA is crosslinked by light, a photosensitizer is usually used in an amount of 5 parts by mass or less, preferably 0.1 to 3.0 parts by mass based on 100 parts by mass of EVA instead of the peroxide.

  In this case, usable photosensitizers include, for example, benzoin, benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 5-nitroacenaphthene, hexachlorocyclopentadiene, p-nitrodiphenyl. , P-nitroaniline, 2,4,6-trinitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-1,9-benzanthrone, and the like. Alternatively, two or more types can be mixed and used.

  Moreover, a silane coupling agent is used in combination as an adhesion promoter. As this silane coupling agent, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycid Xylpropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like can be mentioned.

  The silane coupling agent is generally used in an amount of 0.001 to 10 parts by mass, preferably 0.001 to 5 parts by mass, based on 100 parts by mass of EVA, and one or more types are mixed and used.

  In addition, the EVA adhesive layer according to the present invention may further contain a small amount of an ultraviolet absorber, an infrared absorber, an anti-aging agent, a coating processing aid, a colorant, and the like. A small amount of a filler such as hydrophobic silica or calcium carbonate may be included.

  For example, after the EVA and the above-mentioned additive are mixed and kneaded with an extruder, a roll or the like, the adhesive layer is formed into a predetermined shape by a film forming method such as a calendar, roll, T-die extrusion, or inflation. Manufactured by.

  A protective layer may be provided on the antireflection layer. The protective layer is preferably formed in the same manner as the hard coat layer.

  The material of the release sheet provided on the transparent adhesive layer is preferably a transparent polymer having a glass transition temperature of 50 ° C. or higher. Examples of such a material include polyesters such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate. In addition to polyamide resins such as nylon resins, nylon 46, modified nylon 6T, nylon MXD6, polyphthalamide, ketone resins such as polyphenylene sulfide and polythioether sulfone, and sulfone resins such as polysulfone and polyether sulfone, Mainly composed of polymers such as polyether nitrile, polyarylate, polyether imide, polyamide imide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polyvinyl chloride That the resin can be used. Of these, polycarbonate, polymethyl methacrylate, polyvinyl chloride, polystyrene, and polyethylene terephthalate can be suitably used. The thickness is preferably 10 to 200 μm, particularly preferably 30 to 100 μm.

  The optical filter of the present invention is manufactured as follows, for example. By sequentially providing a conductive layer, a hard coat layer, an antireflection layer, etc. on one surface of the long transparent film, and then providing a near-infrared absorbing layer and a transparent adhesive layer on the other surface of the transparent film A long laminate is produced. The installation of each layer may be performed continuously or in a batch. The long laminated body thus obtained is cut in the width direction and obliquely with respect to the horizontal to obtain the optical filter of the present invention. Further, the longitudinal side surface of the obtained rectangular optical filter may be cut obliquely.

  As a method of cutting the long laminate in the width direction and obliquely with respect to the horizontal, for example, a method of dropping the cutter of the cutting machine in an oblique direction, and a shape that can form a slope as the cutter of the cutting machine The method of using a thing etc. can be mentioned. Or the method of cut | disconnecting using the cutting plotter which installed the blade diagonally, or an ultrasonic cutter or a laser cutter can also be mentioned. As a method of forming a slope on the end face in the longitudinal direction, there is a method of making the angle of the slitter oblique.

  Moreover, as a coating machine used when applying (applying) each layer to a long transparent film, a slit die, a lip direct, a lip reverse, etc. can be used. When both surfaces are applied simultaneously, a double-sided simultaneous coating machine in which lip dies are arranged on both sides is generally used.

  When two long transparent films are used, a hard coat layer and an antireflection layer are sequentially provided on the other surface of one long transparent film, and another long transparent film is formed. One surface is provided with a conductive layer, and the other surface is provided with a near-infrared absorbing layer and a transparent adhesive layer (or a near-infrared cut film may be provided with a transparent adhesive layer). The back surface of the transparent film and the conductive layer of the latter transparent film are opposed to each other via the pressure-sensitive adhesive layer, and can be easily manufactured by overlapping and integrating. What is necessary is just to cut | judge the elongate laminated body obtained in this way as mentioned above.

  The display optical filter of the present invention thus obtained is used by being bonded to the surface of an image display glass plate of a display such as a PDP.

  Since the PDP display device of the present invention uses a plastic film as the transparent substrate, the optical filter of the present invention can be directly bonded to the surface of the glass plate, so that one transparent film is used. In this case, the PDP itself can contribute to weight reduction, thickness reduction, and cost reduction. Compared with the case where a front plate made of a transparent molded body is installed on the front side of the PDP, an air layer having a low refractive index can be eliminated between the PDP and the PDP filter, so that visible light reflection due to interface reflection can be achieved. Problems such as an increase in rate and double reflection can be solved, and the visibility of the PDP can be further improved.

  Therefore, the optical filter of the present invention is excellent in antireflection effect and antistatic property, hardly emits dangerous electromagnetic waves, is easy to see, hardly has dust and the like, and can be said to be a safe display.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not limited to a following example.

[Example 1]
<Preparation of optical filter for display without electrode part>
(1) Formation of mesh-like conductive layer On an easy-adhesion layer of a long polyethylene terephthalate film (width: 600 mm, length 100 m) having a thickness of 100 μm having an easy-adhesion layer (polyester polyurethane; thickness 20 nm) on the surface, A 20% aqueous solution of polyvinyl alcohol was printed in dots. The size of one dot is a square shape with one side of 234 μm, the interval between the dots is 20 μm, and the dot arrangement is a square lattice. The printing thickness is about 5 μm after drying.

  On top of that, copper was vacuum-deposited to an average film thickness of 4 μm. Next, it was immersed in water at room temperature and rubbed with a sponge to dissolve and remove the dot portion, then rinsed with water and dried to form a mesh-like conductive layer on the polyethylene film.

  The conductive layer on the film surface had a square lattice shape corresponding to the negative pattern of dots accurately, the line width was 20 μm, and the aperture ratio was 77%. The average thickness of the conductive layer (copper layer) was 4 μm.

(2) Formation of hard coat layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 80 parts by mass ITO (average particle size 150 nm) 20 parts by mass Methyl ethyl ketone 100 parts by mass Toluene 100 parts by mass Irgacure 184 (manufactured by Ciba Specialty Chemicals) 4 parts by mass

A coating liquid obtained by mixing the above was applied onto the mesh-like conductive layer using a bar coater and cured by ultraviolet irradiation. Thereby, a 11 μm thick hard coat layer (refractive index 1.52) was formed on the mesh-like conductive layer.

(3) Formation of low refractive index layer The following formulation:
Opstar JN-7212 (manufactured by JSR Corporation) 100 parts by weight Methyl ethyl ketone 117 parts by weight Methyl isobutyl ketone 117 parts by weight

The coating liquid obtained by mixing was applied on the hard coat layer using a bar coater, dried in an oven at 80 ° C. for 5 minutes, and then cured by ultraviolet irradiation. Thereby, a low refractive index layer (refractive index 1.42) having a thickness of 90 nm was formed on the hard coat layer.

(4) Formation of near-infrared absorbing layer (having color tone correction function)
Polymethylmethacrylate 30 parts by mass TP-2 (manufactured by Yamada Chemical Co., Ltd.) 0.4 parts by mass Plast Red 8380 (manufactured by Arimoto Chemical Industry Co., Ltd.) 0.1 parts by mass CIR-1085 (Nippon Carlit Co., Ltd.) Manufactured) 1.3 parts by weight IR-10A (manufactured by Nippon Shokubai Co., Ltd.) 0.6 parts by weight Methyl ethyl ketone 152 parts by weight Methyl isobutyl ketone 18 parts by weight of a coating solution obtained on the back of the polyethylene film It was applied using a bar coater and dried in an oven at 80 ° C. for 5 minutes. As a result, a near-infrared absorbing layer (having a color tone correcting function) having a thickness of 5 μm was formed on the polyethylene film.

(5) Formation of transparent adhesive layer The following formulation:
SK Dyne 1811L (manufactured by Soken Chemical Co., Ltd.) 100 parts by mass Curing agent L-45 (manufactured by Soken Chemical Co., Ltd.) 0.45 parts by mass Toluene 15 parts by mass Ethyl acetate 4 parts by mass Was coated on the near infrared absorbing layer using a bar coater and dried in an oven at 80 ° C. for 5 minutes. This formed a 25-micrometer-thick transparent adhesive layer on the near-infrared absorption layer.

  Thus, an optical filter for display without an electrode part was obtained.

  This optical filter for display without a long electrode part is cut in the width direction by dropping the cutter of the cutting machine at an angle of 45 degrees with respect to the normal of the conductive layer, using a cutting machine as a contact electrode. An optical filter for display (no electrode portion) having a sloped end surface of the conductive layer was obtained.

[Example 2]
An optical filter for display was obtained in the same manner as in Example 1 except that a high refractive index layer was provided as described below between the hard coat layer and the low refractive index layer.

(6) Formation of high refractive index layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 6 parts by weight ZnO (average particle size 4 nm) 4 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Irgacure 184 (manufactured by Ciba Specialty Chemicals) Was coated on the hard coat layer using a bar coater and cured by ultraviolet irradiation. As a result, a high refractive index layer (refractive index: 1.70) having a thickness of 90 nm was formed on the hard coat layer.

[Examples 3 and 4]
Pb-free solder (components: Sn 96.5%, Ag 3%, Cu 0.5%) was heated (220 ° C.) on all four end faces of the display-use optical filter without electrodes obtained in Examples 1 and 2. A solder electrode portion having a width (thickness) of 50 μm was formed.

[Examples 5 and 6]
Conductive material-containing adhesive (acrylic resin in which Ag-Cu powder is dispersed; trade name Doutite FE-107; Fujikura Kasei Co., Ltd.) on all four end faces of the optical filter for display having no rectangular electrode portion obtained in Examples 1 and 2. Co., Ltd.) was applied and heated at 60 ° C. for 1 hour to form an electrode part of a conductive material-containing adhesive having a width (thickness) of 50 μm.

[Examples 7 and 8]
Conductiveness of 15 mm (thickness 50 μm) so that the range of 12 mm inward from the edge of the cut surface on both sides of the optical filter for display obtained in Examples 1 and 2 is in contact with the surface of the top layer and 3 mm protrudes outward. A flexible aluminum tape was placed. Furthermore, a conductive adhesive (polyester resin in which Ag powder is dispersed; trade name DW-250H-5; manufactured by Toyobo Co., Ltd.) is applied to the lower part of the conductive aluminum tape so as to be in contact with the cut surface. Heating was performed for 1 hour to form an electrode part of the conductive material-containing adhesive having a width (thickness) of 50 μm.

[Example 9]
In Example 1, (1) A display optical filter without a rectangular electrode portion was obtained in the same manner except that the mesh-shaped conductive layer was formed as follows.

  A copper foil having a thickness of 10 μm was attached to the entire surface of the adhesive layer of a long polyethylene terephthalate film (width: 600 mm, length 100 m) having a thickness of 100 μm having an adhesive layer (polyester polyurethane; thickness 20 nm) on the surface. . A dot pattern was formed on this copper foil by a photolithography method, and the exposed portion of the copper foil was etched to form a copper foil having a lattice pattern (wire diameter: 10 μm, pitch: 250 μm).

  The conductive layer on the film surface had a line width of 10 μm and an aperture ratio of 90%. The average thickness of the conductive layer (copper layer) was 10 μm.

[Example 10]
An optical filter for display without a rectangular electrode portion was obtained in the same manner as in Example 9 except that a high refractive index layer was provided as described below between the hard coat layer and the low refractive index layer.

(6) Formation of high refractive index layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 6 parts by weight ZnO (average particle size 4 nm) 4 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Irgacure 184 (manufactured by Ciba Specialty Chemicals) Was coated on the hard coat layer using a bar coater and cured by ultraviolet irradiation. As a result, a high refractive index layer (refractive index: 1.70) having a thickness of 90 nm was formed on the hard coat layer.

[Examples 11 and 12]
Pb-free solder (components: Sn 96.5%, Ag 3%, Cu 0.5%) was heated (220 ° C.) on all four end faces of the optical filter for display without electrodes obtained in Examples 9 and 10. A second electrode portion of solder having a width (thickness) of 50 μm was formed.

[Examples 13 and 14]
A conductive adhesive (acrylic resin in which Ag-Cu powder was dispersed; trade name Doutite FE-107; Fujikura Kasei Co., Ltd.) was formed on all four end faces of the optical filter for display without electrode part obtained in Examples 9 and 10. Manufactured) and heated at 60 ° C. for 1 hour to form a second electrode portion of a conductive material-containing adhesive having a width (thickness) of 50 μm.

[Examples 15 and 16]
15 mm (thickness) so that the range of 12 mm inward from the edge of all four end faces of the optical filter for display without electrode part obtained in Examples 9 and 10 is in contact with the surface of the uppermost layer and 3 mm protrudes outward. 50 μm) conductive aluminum tape was placed. Further, a conductive adhesive (polyester resin in which Ag powder is dispersed; trade name DW-250H-5; manufactured by Toyobo Co., Ltd.) is applied to the lower part of the conductive aluminum tape so as to be in contact with the cut surface. Heating was performed for 1 hour to form a second electrode portion of the conductive material-containing adhesive having a width (thickness) of 50 μm.

  The obtained optical filter for display was evaluated as follows.

[Evaluation of optical filter]
(1) Conductivity A resistance meter (trade name: Milliohm Hitester; manufactured by Hioki Electric Co., Ltd.) was connected to the electrodes (two opposed electrode parts) of the optical filter, and the resistance value was measured.

  The results are shown in Table 1.

  In addition, the PDP filters obtained in Examples 3 to 8 and 11 to 16 are not inferior to conventional ones in terms of transparency, electromagnetic wave shielding properties, etc. even if they are actually attached to the PDP. It was easy to do.

It is a schematic sectional drawing which shows an example of the basic composition of the optical filter of this invention. It is a schematic sectional drawing which shows another example of the basic composition of the optical filter of this invention. It is a schematic sectional drawing of an example of the preferable aspect in the optical filter of this invention. It is a schematic sectional drawing of an example of the especially preferable aspect in the optical filter of this invention. It is a schematic sectional drawing of another example of the especially preferable aspect in the optical filter of this invention. It is a top view of the optical filter of the present invention of the above-mentioned FIG. It is a schematic sectional drawing of another example of a preferable aspect in the optical filter of this invention.

Explanation of symbols

11, 21, 41, 31, 51, 61 Display optical filter 12, 22, 32, 42, 51, 62A, 62B Transparent film 13, 23, 33, 43, 53, 63 Conductive layer 16, 26, 36, 46 , 56, 66 Hard coat layer 17, 27, 37, 47, 57, 67 Antireflection layer 14, 24, 34, 44, 54, 64 Near-infrared absorbing layer 15, 25, 35, 45, 55, 65 Transparent adhesive Layer 38, 48, 58, 68 Electrode 59, 69 Conductive tape

Claims (26)

An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
An optical filter for display, wherein the end face of the conductive layer in at least a part of the end face of the laminate is a slope. An optical filter for display in which a conductive layer and a hard coat layer are provided in this order on one surface of a transparent film, and a near-infrared absorbing layer is provided on the other surface,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
An optical filter for display, wherein the end face of the conductive layer in at least a part of the end face of the laminate is a slope. An optical filter for display in which a conductive layer and a near-infrared absorbing layer are provided in this order on one surface of a transparent film, and a hard coat layer is provided on the other surface,
A transparent film, a conductive layer, a hard coat layer, and a near-infrared absorbing layer are laminated together to form an end face,
An optical filter for display, wherein the end face of the conductive layer in at least a part of the end face of the laminate is a slope. Two transparent films, a transparent film provided with a hard coat layer on one surface and another transparent film provided with a conductive layer on one surface, are the back surface of the former transparent film and the latter transparent film. In the state where the conductive layer is opposed to the adhesive layer through the adhesive layer, the optical filter for display is bonded,
Two transparent films, a conductive layer, and a hard coat layer are laminated together to form an end face,
An optical filter for display, wherein an end face of the conductive layer in at least a part of the end face of the laminate is a slope.   The shape of the transparent film, the conductive layer, and the hard coat layer, or the transparent film, the conductive layer, the hard coat layer, and the near-infrared absorbing layer are laminated so as to be the same in shape and area and flush with the end face. The optical filter for display according to any one of claims 1 to 4.   The shape of the transparent film, the conductive layer and the hard coat layer, or the shape of the transparent film, the conductive layer, the hard coat layer and the near-infrared absorbing layer is rectangular. .   The optical filter for display according to any one of claims 1 to 6, wherein an angle of the inclined surface is 30 to 60 degrees with respect to a perpendicular of the conductive layer.   The optical filter for display according to any one of claims 1 to 7, wherein an end surface of each surface of the laminate is a slope in the entire end surface.   The optical filter for display according to any one of claims 6 to 8, wherein at least two opposing end faces are inclined surfaces.   The optical filter for a display according to any one of claims 1 to 9, wherein an electrode part is formed on a slope of the conductive layer exposed at the end face by a conductive material-containing adhesive or solder.   A long conductive tape is provided so that a part of the hard coat layer or near-infrared absorbing layer, or the rectangular surface of the uppermost layer provided thereon, protrudes at least at the end regions of the two sides facing each other, The optical filter for display according to claim 10, wherein at least a part of the protruding portion is bonded to the electrode portion on the slope.   A long conductive tape is bonded to at least two opposite end regions of the hard coat layer or the uppermost layer provided thereon so that the sides and the longitudinal direction of the tape are parallel to each other. 11. An optical filter for display according to 11.   The optical filter for display according to claim 4, wherein a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a hard coat layer.   The optical filter for display according to claim 4, wherein a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a conductive layer.   The optical filter for display according to any one of claims 1 to 14, wherein the conductive layer is a mesh-like conductive layer.   The optical filter for display according to any one of claims 1 to 15, wherein a low refractive index layer is further formed on the hard coat layer.   The optical filter for a display according to any one of claims 1 to 3 and 5 to 16, wherein a transparent adhesive layer is provided on a surface of the near-infrared absorbing layer opposite to the transparent film.   The optical filter for display according to any one of claims 1 to 3 and 5 to 16, wherein the near-infrared absorbing layer has adhesiveness.   The optical filter for display according to any one of claims 15 to 18, wherein a hard coat layer is embedded in the mesh gap of the mesh-like conductive layer.   The optical filter for display according to any one of claims 1 to 19, wherein the transparent film is a plastic film.   21. The optical filter for display according to any one of claims 17 to 20, wherein a release sheet is provided on the transparent adhesive layer or the adhesive near-infrared absorbing layer.   It is a filter for plasma display panels, The optical filter for displays of any one of Claims 1-21.   A conductive layer is formed on the entire length of the long transparent film, and then a hard coat layer is formed on the conductive layer in the width direction. A method for producing an optical filter for display, comprising: forming a laminate having a conductive layer by forming an infrared absorbing layer; and further cutting the laminate in the width direction and obliquely with respect to a horizontal plane.   A long transparent film in which a hard coat layer is provided in this order on one surface, and another transparent film in which a near infrared absorption layer is provided on one surface and a conductive layer is provided on the other surface, The two transparent films are arranged so that the back surface of the former long transparent film and the conductive layer of another transparent film face each other through the adhesive layer, and a laminate is formed by bonding, Furthermore, the laminated body is cut in the width direction and obliquely with respect to the horizontal plane.   23. A display, wherein the display optical filter according to claim 1 is bonded to a surface of an image display glass plate. 23. A plasma display panel, wherein the display optical filter according to claim 1 is bonded to a surface of an image display glass plate.

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