JP5011694B2 - Manufacturing method of composite filter for display - Google Patents

Description

  The present invention relates to an electromagnetic wave shielding function for shielding electromagnetic waves generated from various displays such as CRT and PDP, and a method for manufacturing a composite filter for a display having an optical filter function. More specifically, the present invention relates to a manufacturing method in which it is not necessary to remove and remove an optical filter for grounding.

  In order to shield (shield) electromagnetic waves generated from various displays such as a PDP (plasma display panel) and a CRT (CRT) display, an electromagnetic wave shielding filter disposed in front of the display is known. The electromagnetic wave shielding filter used for such applications requires light transmittance as well as electromagnetic wave shielding performance. Therefore, as an electromagnetic wave shielding filter, for example, by etching a metal foil such as a copper foil bonded to a transparent base material made of a resin film with an adhesive, a conductor layer provided with a mesh region is formed on the transparent base material. An electromagnetic wave shielding sheet having a structure laminated on the substrate is known.

  In addition to the electromagnetic wave shielding function, the front filter or the like disposed on the front surface of the display blocks an optical filter function, for example, unnecessary light radiated from the display (for example, light having a wavelength of about 590 nm due to neon emission in a PDP). There are cases where a function for improving color reproducibility by adjusting hue, a function for suppressing unnecessary reflection of external light, a function for suppressing unnecessary infrared radiation from a display and a function of preventing malfunction of an infrared device, and the like may be required. Therefore, in an actual front filter, an optical filter (for example, an antireflection filter, a coloring filter, an infrared absorption filter, etc.) having other filter functions is laminated and integrated on the electromagnetic wave shielding sheet as described above to combine the functions. In many cases, it is used as a composite filter for display (see Patent Document 1, etc.).

  Further, such a composite filter for display needs to ground the conductor layer of the electromagnetic wave shielding sheet. For this purpose, usually there is a frame-like, non-mesh conductor layer provided around the mesh area as a grounding area at the periphery of the mesh area of the conductor layer. In general, grounding is performed from the grounding area. For this reason, in the conventional composite filter for display, it is necessary to remove the optical filter attached just above the grounding area by a desired area to expose the surface necessary for grounding in order to achieve grounding. (See Patent Document 1, Patent Document 2, etc.).

However, in this method, the exposure processing of the ground plane is inevitably performed at a stage close to the final process in which the completed composite filter for display and the display body are combined. For this reason, it is necessary to perform the exposure processing once for each display. Therefore, it is impossible to perform mass production in a mass, the production efficiency is poor, and it is cumbersome. If requested and failed, the entire display composite filter is wasted.
Further, after the electromagnetic wave shielding sheet (filter) and the optical filter are laminated and integrated, it is difficult to expose the conductor layer accurately without peeling it again and damaging the conductor layer. There was a difficulty (Problem 1) that the probability of failure was high.

  Therefore, in order to solve this problem, when cutting the optical filter into the size of one display, all the layers are separated from the part to be removed for grounding in advance, apart from the part to be cut into single wafers. After making a cut (half cut) that reaches most of the thickness, it is laminated on the electromagnetic wave shielding sheet to form a composite filter, and then cut at the cut to provide an optical filter directly above the frame portion of the grounding region ( In addition, a method of peeling off and removing the adhesive layer used for the adhesion has also been attempted (Patent Document 3).

JP 2003-86991 A Japanese Patent Laid-Open No. 11-12604 (particularly FIG. 1) JP 2003-66854 A

  However, the method according to Patent Document 3 reduces the probability that the conductor layer is damaged at the time of peeling, and the peeling work itself becomes easy. However, these works are still performed for each display, There is a problem (problem 2) that mass production processing is impossible, production efficiency is poor and complicated, and that the objects to be removed and the work load increase when the composite filter for display is grounded.

Therefore, in order to improve productivity, an electromagnetic shielding sheet and an optical filter were both supplied to a roll laminator as a continuous belt-like sheet, and a production method in which both were continuously laminated with an adhesive was attempted. In addition, at this time, as in the conventional method illustrated in the explanatory diagram of FIG. 5, the width of the optical filter 20 is made smaller than the width of the electromagnetic wave shielding sheet 10, and the grounding regions 102 on both sides of the electromagnetic wave shielding sheet are continuous. It is the method of laminating | stacking by the positional relationship which is exposed.
By this method, the above problems 1 and 2, which are the labor at the time of peeling the optical filter, the poor mass production processability due to the required time, and the defects due to the damage of the conductor layer can be improved. In addition, there is no problem if only two places on both sides in the width direction of the electromagnetic wave shielding sheet as a continuous belt-like sheet are sufficient.
However, in the case where grounding locations are provided on the four circumferences of the mesh region of the conductor layer, the two left and right side portions of the mesh region 101 for each product unit 3u in the flow direction of the electromagnetic wave shielding sheet are locations where grounding is impossible. 104, and the conventional problem remains unsolved.

  That is, the object of the present invention is to prevent the occurrence of defects due to the labor of removing the optical filter for securing the grounding location, the poor mass production processability due to the required time, and the damage to the conductor layer as a manufacturing method of the composite filter for display. Then, it is to be able to provide a grounding location on all four circumferences of the mesh region of the conductor layer.

In order to solve the above-mentioned problems, a method for producing a composite filter for display according to the present invention is a method for producing a composite filter for display comprising a laminate of an electromagnetic wave shielding sheet and an optical filter. At least the following (A), (B) The method for producing a composite filter for display having the steps of (C).
(A) A step of preparing an electromagnetic wave shielding sheet; the electromagnetic wave shielding sheet is formed by laminating a transparent substrate and a conductor layer on one surface thereof in the thickness direction, and in a plane. The conductor layer includes a mesh region that can cover the entire image display region of the display to be applied, a grounding region that forms a mesh surrounding four circumferences of the meshed region, and the grounding region. 1 is a continuous belt-like sheet in which one unit formed by forming a frame-like region having no opening on the periphery is periodically connected and arranged in one direction.
(B) a step of preparing an optical filter; the optical filter is formed by laminating an adhesive layer on one surface, and all the portions of the electromagnetic wave shielding sheet facing the image display area of the display, and the grounding A continuous belt-like sheet having a shape and a dimension capable of covering at least a part of the working area, and an area facing a grounding required portion in the four circumferences of the grounding area of the electromagnetic wave shielding sheet is cut out. It consists of
(C) exposing the grounding area of the electromagnetic wave shielding sheet; the adhesive layer side of the optical filter is directed to the conductor layer side of the electromagnetic wave shielding sheet, and the optical filter is an image of the display on the electromagnetic wave shielding sheet Adhering the optical filter to the electromagnetic wave shielding sheet in an aligned state so as to face directly above the part facing the display area and so that the cut-out area of the optical filter faces a grounding required place of 4 rounds, Then, the conductor layer is exposed at the place where the grounding is required around the electromagnetic wave shielding sheet 4.

  By adopting such a method, the optical filter is used for grounding at the time of laminating the optical filter and the electromagnetic wave shielding sheet as continuous belt-like sheets, even if the grounding location is provided on all four circumferences of the conductive layer mesh area. Since the area facing the grounding required place in the 4th circle of the area is cut out and laminated, the optical filter already laminated on the electromagnetic wave shielding sheet is not peeled and removed for grounding. Rather, a plurality of units can be stacked continuously while exposing the necessary grounding portions. Therefore, mass production processability can be obtained, and damage to the conductor layer can be avoided.

In addition, Preferably, the manufacturing method of the composite filter for displays of this invention is a manufacturing method which has the following (D) process after the said (C) process in the method of the said structure.
(D) Single wafer cutting step; cutting a composite filter for display in the form of a continuous belt-like sheet in which conductor layers are periodically connected and arranged in one direction for each unit corresponding to one display; Separate.

  By adopting such a method, the composite filter for display can be finally made into a sheet-like sheet having a size corresponding to one display, and the mass production processability and the effect of avoiding damage to the conductor layer can be achieved. Is obtained in the same way.

  According to the present invention, mass production processability can be obtained and damage to the conductor layer can be avoided even if the grounding portions are provided on the four circumferences of the mesh-like region of the conductor layer. Furthermore, a sheet-like sheet having a size corresponding to one display can be finally obtained.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

<< (A) Step of preparing an electromagnetic wave shielding sheet; >>
In the step (A), as an electromagnetic wave shielding sheet, in the thickness direction, the transparent substrate and at least one conductor layer is laminated on one surface, and in the plane, the conductor layer is: A unit composed of a mesh area that can cover the entire image display area of the display to be applied and a grounding area that surrounds the four circumferences of the mesh area is periodically connected in one direction and arranged. This is a step of preparing a continuous belt-like sheet.

FIG. 1 is an explanatory view conceptually showing a method for manufacturing a composite filter for display according to the present invention in a reference example, FIG. 1 (A) is a plan view, and FIG. 1 (B) is a single display. It is sectional drawing shown by the corresponding product unit. Also, FIG. 2, the electromagnetic wave shielding sheet for use in the present invention, the reference examples of its indicated by a state example after a product unit, in FIG. 2 (A) a plan view, FIG. 2 (B) It is sectional drawing. 1 and 2 are reference examples in that the grounding region of the electromagnetic wave shielding sheet has a configuration that does not include a frame-shaped region at the periphery thereof.

  The electromagnetic wave shielding sheet is provided as a continuous belt-like sheet (also referred to as a web) when it is laminated with the optical filter. In addition, the electromagnetic wave shielding sheet is a conductive layer laminated on the transparent base material 11 in the thickness direction, like the electromagnetic wave shielding sheet 10 illustrated in FIGS. 1B and 2B. Twelve. In addition, the top view including FIG. 1 (A) and FIG. 3 (A) and FIG. 5 which will be described later shows only a part in which 3 units of product units 3u are arranged in the longitudinal direction (flow direction) of the continuous belt-like sheet. On the electromagnetic wave shielding sheet 10, the optical filter 20 in which at least 4 units or more as product units are arranged in the longitudinal direction of the continuous belt-like sheet is overlapped and conceptually a part (on the right side of the drawing) is adhesively laminated. It is a top view at the time of seeing from the optical filter side which shows these. The hatched portion of the optical filter 20 is transparent so that the shape and arrangement of the mesh region 101 and the grounding region 102 included in the conductive layer of the lower electromagnetic wave shielding sheet 10 can be seen. It is drawn as.

Like the electromagnetic wave shielding sheet 10 illustrated in FIGS. 1 (A) and 2 (A), the conductor layer 12 is positioned in the center in the in-plane direction and faces the screen portion of the display. One unit is constituted by the mesh-like region 101 to be grounded and the grounding region 102 surrounding the periphery thereof. This unit includes a product unit 3u of a composite filter for display corresponding to one display, like the electromagnetic wave shielding sheet 10 illustrated in FIG. 1A, and the entire region of the one unit is a product unit. 3u may be used, or a part of the 1 unit region may be used as the product unit 3u as in the electromagnetic wave shielding sheet 10 illustrated in FIG.
Further, an electromagnetic wave shielding sheet of a continuous belt-like sheet is obtained by continuously connecting a desired number of the units in one direction (specifically, the flow direction of the continuous belt-like sheet, in other words, the longitudinal direction). It becomes. Moreover, the transparent base material 11 also consists of a continuous belt-like sheet.

  The mesh area 101 is an area that can cover the entire image display area of the display to which the mesh area 101 is applied, and has a grounding area 102 in at least a part of the periphery of the mesh area 101. The mesh area 101 has a size and shape that can cover the entire image display area of the applied display, and always includes a portion 40 that faces the image display area of the applied display. The outer edge portion that is an area outside the portion 40 facing the image display area of the display may include the mesh-shaped area 101 or may include only the grounding area 102.

The grounding region 102 is provided as a region surrounding the circumference of the mesh region 101. The grounding region 102 is provided in a portion that does not affect the image display, which is an outer edge portion that is an outer region of the portion 40 facing the image display region of a normal rectangular display.
Ground region 102, typically if, which does not form an opening while having the same layer structure as a mesh-like area 101 is provided in order to facilitate taking the grounded when installed in the display. However, in the present invention, the ground area 102 includes a mesh der Ru region where the opening portion is formed.
That is, in the present invention , as shown in FIG. 1A , the grounding region 102 is not formed of a continuous conductor layer having no opening, and is not shown in FIGS. 3A and 3B. in as one embodiment that schematically shows an example has an area obtained by forming a mesh like the mesh-like area, further frame without mesh unformed the opening in the periphery of the ground area 102 -Like region 102a . Embodiment of FIG. 3 (A) and (B), the ground region 102 is a configuration containing a frame-shaped region 102a of the mesh not formed for ensuring strength in at 4 around the peripheral edge within that region. Incidentally, there is no該額edged regions 102a to the grounding region 102, in the structure consisting of the entire surface of all the mesh, scarce practicality in terms of strength.

  In addition, as illustrated in FIGS. 3A and 3B, the grounding region 102 has a shape corresponding to one display at the end of all four or one part of the periphery in the region. When cutting and separating, a “margin” portion that is unnecessary and cut off may be included. In FIG. 3A, the margin cutting portion 103a is cut. As for the margin, all or a part of the margin may be a frame-shaped region, a mesh shape, or either. The case of FIG. 3 is an example of a margin when a frame-like region 102a exists at the four peripheral edges in the margin as a part of the margin, and the margin portion inside the frame-like region 102a is in a mesh shape.

As shown in FIG. 1B, the electromagnetic wave shielding sheet 10 according to the present invention has a conductive region having a mesh region 101 and a grounding region 102 on one surface of the transparent substrate 11 in the thickness direction. The body layer 12 is formed by being laminated at least.
In addition, the electromagnetic wave shielding sheet may further include a layer having no conductivity on the front and back surfaces of the conductor layer. Examples of the layer that does not have conductivity include a rust preventive layer that does not have conductivity, a blackened layer that does not have conductivity, and a planarized layer. In addition, even if it is a rust prevention layer, a blackening layer, etc., as long as it has electroconductivity (effective with respect to electromagnetic wave shielding), it is contained in a conductor layer in this invention. The non-conductive layer further laminated on the front and back surfaces of the conductor layer is integrated with the conductor layer to form a mesh region and a grounding region.

In addition, in the electromagnetic wave shielding sheet used in the present invention, materials such as the transparent base material 11 and the conductor layer 12, or a lamination method or a forming method thereof may be appropriately selected from conventionally known ones depending on the application. There are no particular restrictions.
Here, typical constituent layers of the electromagnetic wave shielding sheet will be described in order from the transparent substrate 11.

(Transparent substrate)
The transparent substrate 11 is a layer for reinforcing a mesh layer having a low mechanical strength, and is a layer that can take the form of a continuous belt-like sheet. Therefore, as long as it has light transmittance as well as mechanical strength, it may be selected and used depending on the application, taking into account heat resistance, insulation, etc. as appropriate. A specific example of the transparent substrate is a resin sheet (or film, the same applies hereinafter). Examples of the transparent resin used as the resin sheet include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose resins, acrylic resin sheets, styrene resins, and polycarbonate resins.
In addition, these resins are used as a single or a plurality of types of mixed resins (including polymer alloys) as a resin material, and as a layer, they are used as a single layer or a laminate of two or more layers. Moreover, you may add additives, such as a ultraviolet absorber, a near-infrared absorber, a filler, a plasticizer, an antistatic agent, suitably in these resin as needed.
The resin sheet is more preferably a uniaxially stretched or biaxially stretched sheet in terms of mechanical strength.

  The thickness of the transparent substrate is not particularly limited as long as it is suitable for the application, and is usually about 12 to 1000 μm, preferably 50 to 700 μm, more preferably 100 to 500 μm. Further, the transparent substrate may be appropriately subjected to a known easy adhesion treatment on the surface thereof.

Moreover, although the transparency of a transparent base material is so good that it is good, Preferably the light transmittance which becomes 80% or more by visible light transmittance | permeability is good.
The transparent substrate may be colored with a pigment or the like. By coloring, near infrared absorption, neon light absorption, color adjustment, prevention of external light reflection, and the like can be achieved. For example, various conventionally known dyes such as a near-infrared absorber, a neon light absorber, a color adjusting dye, and an external light antireflection dye may be added to the resin transparent substrate.

[Conductor layer]
The conductor layer 12 is a layer that has conductivity and has an electromagnetic wave shielding function, and even if it is opaque, it has an opening in a mesh shape so that it has an electromagnetic wave shielding property and light transmittance. It is a layer that balances. Such a conductor layer usually consists mainly of a metal layer, and in addition to this, a conductive treatment layer, a conductive blackening layer, a conductive rust prevention layer, etc. contribute to electromagnetic wave shielding performance. When it has the electroconductivity which can be performed, the electroconductive process, layer blackening layer, rust prevention layer, etc. which have these electroconductivity are included.

The mesh region 101 of the conductor layer 12 has a mesh shape in which openings are densely arranged, and includes an opening and a frame-shaped line portion existing between the openings.
The shape of the mesh is arbitrary and not particularly limited, but the shape of the opening is typically a square. Examples of the shape of the opening include a triangle such as a regular triangle, a square such as a square, a rectangle, a rhombus, and a trapezoid, a polygon such as a hexagon, a circle, and an ellipse. The mesh has a plurality of openings having these shapes, and the openings are usually line-shaped line portions having a uniform width. Usually, the openings and the line portions have the same shape and the same size on the entire surface. To illustrate the specific size, the width of the line portion between the openings is 25 μm or less, preferably 20 μm or less in terms of the aperture ratio and the invisibility of the mesh. However, at least 5 μm is preferable for electromagnetic wave shielding performance and prevention of breakage. The opening width of the opening is represented by [line pitch]-[line width], and is 150 μm or more, preferably 200 μm or more. Light transmittance and bubbles are formed in the opening when laminated with an optical filter described later. Is preferable because it is difficult to remain. However, in order to exhibit electromagnetic wave shielding properties in the MHz to GHz band, the maximum is 3000 μm or less.
In addition, the bias angle of the mesh region (angle formed between the mesh line portion and the outer periphery of the electromagnetic wave shielding sheet) may be appropriately set to an angle at which moire is difficult to occur in consideration of the pixel pitch of the display and the light emission characteristics. .

  In the present invention, the thickness of the finally obtained mesh region (specifically, the height of the line part existing between the openings) is preferably 3 μm or less. This is because even if the flattening of the mesh surface is omitted, the adhesive layer easily enters the opening when the electromagnetic wave shielding sheet and the optical filter are laminated, and bubbles do not easily remain in the opening. On the other hand, in terms of electromagnetic wave shielding performance, a certain amount of thickness is required for appropriate conductivity, and the thickness of the mesh-like region is more preferably 1 to 3 μm after all. The height of a line part means the total thickness including all the thickness of the layer which forms a line part. Therefore, for example, when the line part is composed of a conductor layer, a non-conductive blackening layer, and a non-conductive rust preventive layer, the height of the line part is the total thickness of all these layers.

  The method for preparing the electromagnetic wave shielding sheet 10 as a continuous belt-like sheet in which the conductor layer 12 having the mesh region 101 and the grounding region 102 as described above is laminated on the transparent substrate 11 is particularly limited. There are no known methods, and conventionally known methods can be appropriately employed depending on the application. For example, it is the following methods (1) to (4).

(1) A method in which conductive ink is printed in a pattern on a transparent substrate, and metal plating is performed on the conductive ink layer (see JP 2000-13088 A).
(2) A method in which a conductive ink or a photosensitive plating solution containing a chemical plating catalyst is applied to the entire surface of a transparent substrate, and the coating layer is made into a mesh by photolithography, followed by metal plating on the mesh (Sumitomo Osaka Cement Co., Ltd., New Materials Research Institute, New Materials Research Group, “Photoresolvable Chemical Plating Catalyst”, [online], date not listed, Sumitomo Osaka Cement Co., Ltd. [searched November 22, 2004] Internet <URL: http://www.socnb.com/report/ptech/2000p52.pdf>).
(3) A method in which a transparent substrate and a metal foil are laminated with an adhesive, and then the metal foil is meshed by a photolithography method (see Japanese Patent Application Laid-Open No. 11-145678).
(4) On one surface of the transparent substrate, a metal thin film is formed by sputtering or the like to form a conductive treatment layer, and a transparent substrate on which a metal layer is formed as a metal plating layer by electrolytic plating is prepared. A method in which the metal plating layer and the conductive treatment layer of the transparent substrate subjected to metal plating are meshed by a photolithography method (see Japanese Patent No. 3502979, Japanese Patent Application Laid-Open No. 2004-241761, etc.).

  Among the above (1) to (4), the method (4) is one of the particularly preferable methods from the viewpoints of transparency, mesh accuracy, visibility, yield against warpage and bubble mixing, cost, and the like. Therefore, a method for preparing an electromagnetic wave shielding sheet in the case of the method (4) will be further described.

  In the method (4), a conductive treatment layer and a metal plating layer are sequentially laminated on a transparent substrate, and the conductor layer is composed of both layers (hereinafter, these layers are collectively referred to simply as “metal layer”). It becomes the composition which includes.

  The conductive treatment layer is a layer obtained by conducting a conductive treatment on the surface of the transparent substrate. As a method for the conductive treatment, a thin film of a known conductive material may be formed. As the conductive material, for example, a metal such as copper, nickel, or chromium, or an alloy of these metals (for example, nickel-chromium alloy) or a transparent metal oxide such as tin oxide is used. And these electroconductive materials are applied to a transparent base material surface by methods, such as a well-known vacuum evaporation method, sputtering method, and electroless-plating method, and an electroconductive process layer is formed. Note that the conductive processing layer may be a single layer or a multilayer (a layer of different materials or the same material). Moreover, the thickness of a conductive treatment layer should just have the electroconductivity required at the time of plating the following metal plating layer, and a thin film about 0.001-1 micrometer is preferable.

  The metal plating layer is formed on the surface of the conductive treatment layer by electrolytic plating, and as the material thereof, for example, a conductive metal or alloy that can satisfy electromagnetic wave shielding properties such as copper and nickel is used. From the viewpoint of properties, copper or a copper alloy is preferable. The metal plating layer may be a single layer or a multilayer. The thickness of the metal plating layer is preferably about 2 μm at the maximum. This is also for keeping the thickness of the conductor layer in the mesh-like region preferably within 1 to 3 μm.

  Furthermore, it is preferable in terms of contrast to provide a blackened layer. For this purpose, a blackened layer is provided at least on the side of the observer on the surface of the metal plating layer. As the blackening layer, the metal plating layer surface may be roughened, or a light absorbing (black) layer is provided. In addition, when providing in the transparent base material side, after performing the electroconductive process by a transparent conductive thin film on a transparent base material surface and providing a black plating layer as a blackening layer, the metal plating layer 14 should just be provided.

  Further, a rust prevention layer may be provided. It is also preferable to provide the rust preventive layer so as to cover at least one surface of the metal plating layer, and when the blackened layer is provided at that time, in order to prevent the blackened layer from falling off. The anticorrosive layer may be formed of a metal such as nickel, zinc or chromium or an oxide or compound thereof using a known plating method. Especially, the chromium compound layer obtained by carrying out chromate treatment after galvanization is typical. In addition, the thickness of a rust prevention layer is 0.001-1 micrometer, More preferably, it is about 0.001-0.1 micrometer.

In order to provide the mesh region and the grounding region in the conductor layer when formed on the entire surface of the transparent substrate, a known patterning technique using a photolithography method may be used. For example, in the photolithography method, after a photoresist layer is formed in a mesh pattern, an exposed portion that is not covered with the resist layer is removed by etching, and then the resist layer is removed so that the mesh region and the grounding layer are removed. Pattern the region into the desired shape.
When using the conductive treatment layer and the metal plating layer as exemplified above as the conductor layer during patterning, the patterning is performed on the conductor layer in which the conductive treatment layer and the metal plating layer are laminated. However, if the conductive treatment layer is patterned and then metal plating is applied to the patterned conductive treatment layer, the metal plating layer is not etched and patterned to the desired shape from the beginning. it can.

Further, for example, a planarizing layer for planarizing surface irregularities due to openings or the like of the mesh may be provided on the conductor layer having the mesh region and the grounding region formed as described above. By providing the planarizing layer, when the electromagnetic wave shielding sheet is laminated with the optical filter, this can be prevented when bubbles remain in the opening of the mesh.
As the flattening layer, a resin layer made of an acrylic resin or the like that has only to have transparency, adhesiveness, etc. can be used. Such a flattening layer is, for example, after coating a liquid resin composition, with a peelable sheet having excellent flatness laminated on the surface of the coating film, heating the coating film or ionizing radiation. After curing with, for example, a method of peeling and removing the peelable sheet.

<< (B) Step of preparing an optical filter; >>
In the step (B), as an optical filter, an adhesive layer is laminated on one surface, and all the portions of the electromagnetic wave shielding sheet facing the image display area of the display, and at least the grounding area. An optical device comprising a continuous belt-like sheet having a shape and a dimension capable of covering a part, and a region facing a grounding required portion in the four circumferences of the grounding region of the electromagnetic wave shielding sheet is cut out. It is a step of preparing a filter.

In the drawings illustrated in FIG. 1A and FIG. 3A, an example is shown in which a region facing the grounding required portion is cut out as the cutout region 2c. In addition, the cutout region 2c illustrated in these drawings includes the grounding required portions adjacent to each other in the longitudinal direction of the continuous belt-like sheet (arrangement direction of the one unit) among the adjacent grounding required portions of one unit including the product unit 3u. This is also an example in which the common cutout region 2c that extends over the two is provided in a rectangular shape. Further, the width of the optical filter 20 is narrower than the width of the electromagnetic wave shielding sheet 10 and is laminated so that the outer side in the width direction of the electromagnetic wave shielding sheet protrudes from the optical filter. The two grounding areas on both sides are also examples of a combination of an optical filter and an electromagnetic wave shielding sheet in which the optical filter does not face and the necessary grounding area is exposed without cutting out the optical filter.
The shape, number, arrangement, etc. of the cutout regions are not particularly limited as long as a desired grounding region can be secured.
In addition, the grounding required location exists in the grounding area and is area-wise or smaller than the grounding area, and the cutout region 2c is in a shape including the grounding required location and is larger than the grounding required area.

In addition, for cutting out the optical filter at the portion facing the grounding required portion, a known cutting device such as a punching press, a rotary cutting machine, or a laser may be appropriately employed as the cutting means. Also, only the moment of cutting may be either intermittent feeding in which the running of the continuous belt-like sheet is stopped or continuous feeding in which cutting is performed while running.
The time for providing the cutout region may be before the continuous belt-shaped optical filter is brought into a roll state, but after the roll is unwound, the thickness difference in the cutout region is less likely to remain. It is not impossible to form an adhesive layer after cutting, but it is easier to cut out after forming the adhesive layer. Moreover, when the peeling sheet is laminated | stacked on the adhesive agent (adhesive) layer surface, it is good to cut out with the peeling sheet whole. In addition, it is more preferable in terms of productivity that the cut-out region is formed in-line after the optical filter is loaded on the roll laminator.

  The optical filter used in the present invention is a continuous belt-like sheet having an adhesive layer laminated on one surface of the filter. The optical filter function as an optical filter is provided by a function-expressing layer that bears this function. Moreover, it is good also as a structure which has a transparent base material sheet which carry | supports these layers further. Further, the transparent base sheet itself may be used also as the function expressing layer. Moreover, one optical filter function may be made into one layer, and two or more optical filter functions may be integrated into one layer. Each optical filter function may be an independent layer. As an example of integrating two or more optical filter functions into one layer, a near infrared absorbing agent, an ultraviolet absorber, and a neon light absorbing agent (pigment) are added to the transparent base sheet, and the near infrared ray is formed in one layer. The form which serves as an absorption filter, a neon light absorption filter, and an ultraviolet absorption filter is mentioned. Or you may add a near-infrared absorber etc. to an adhesive bond layer, and may serve as an adhesive bond layer and an optical filter.

  Here, an example of an optical filter that can be used in the present invention is shown in the cross-sectional view of FIG. The optical filter 20 shown in FIG. 4 is a configuration example in which an adhesive layer 22 is laminated on one surface of a transparent substrate sheet 21 and a function expressing layer 23 is laminated on the other surface of the transparent substrate sheet 21. . Of course, a configuration in which the adhesive layer 22 and the function expressing layer 23 are on the same surface side is also possible.

The functional expression layer of the optical filter used in the present invention is not particularly limited, and representative examples thereof include a near infrared absorption layer, a neon light absorption layer, an ultraviolet absorption layer, a color adjusting coloring layer, an antireflection layer, an antiglare layer and the like. Is. In addition, as an additional function other than the optical filter function, an additional functional layer other than the optical filter function such as a hard coat layer and an antifouling layer may be provided as necessary. Further, the additional functional layer may be a layer that also serves as a function-expressing layer.
The adhesive layer is indispensable on the side to be bonded to the electromagnetic wave shielding sheet, but another adhesive layer may be provided on the other side (to be bonded to another object).

In addition, there is no restriction | limiting in particular as each layer of the above adhesive layers, a function expression layer, a transparent base material sheet, and an additional functional layer, A conventionally well-known thing can be employ | adopted suitably.
Here, the main layers will be further described.

[Transparent substrate sheet]
As the transparent substrate sheet, the same transparent substrate as described in the electromagnetic wave shielding sheet can be used.

[Functional expression layer]
As the near-infrared absorbing layer of the function-expressing layer, for example, a resin film containing a near-infrared absorber or a coating solution containing a near-infrared absorber in a resin binder on a transparent substrate sheet is formed by coating. Also good. As the near-infrared absorbing dye, for example, a known organic or inorganic dye such as a polymethine compound can be used. As the resin of the resin binder, for example, a thermoplastic resin such as a polyester resin or an acrylic resin, or a curable resin that is cured by heat, ultraviolet light, or the like can be used.

  As the neon light absorbing layer of the function expressing layer, for example, a resin film containing a neon light absorbing dye or a coating liquid containing a neon light absorbing dye in a resin binder on a transparent substrate sheet is formed by coating. Also good. As the neon light absorbing dye, for example, a known dye such as cyanine can be used. Moreover, as resin of a resin binder, the resin etc. which are described in the said near-infrared absorption layer can be used.

  As the ultraviolet absorbing layer of the function expressing layer, for example, a resin film containing an ultraviolet absorber or a coating liquid containing an ultraviolet absorber in a resin binder may be applied and formed on a transparent substrate sheet. . As the ultraviolet absorber, for example, a known organic or inorganic compound such as benzotriazole or particulate zinc oxide can be used. Moreover, as resin of a resin binder, the resin etc. which are described in the said near-infrared absorption layer can be used.

  As the colored layer for color adjustment of the function-expressing layer, for example, a resin film containing a colorant or a coating liquid containing a colorant in a resin binder may be applied and formed on a transparent substrate sheet. . As the colorant, known color pigments and dyes can be used. Moreover, as resin of a resin binder, the resin etc. which are described in the said near-infrared absorption layer can be used.

  As the antireflection layer of the function expressing layer, for example, a multilayer film in which a low refractive index layer and a high refractive index layer are alternately laminated is generally used, but a dry method such as vapor deposition or sputtering, or a wet method such as coating. Can also be used for film formation. Note that silicon oxide, magnesium fluoride, fluorine-containing resin, or the like is used for the low refractive index layer, and titanium oxide, zirconium oxide, or the like is used for the high refractive index layer.

  As the antiglare layer of the function-expressing layer, for example, the surface of the layer can be finely formed by forming a coating using an inorganic filler such as silica in a resin binder, or by forming using a shaping sheet or a shaping plate. It is formed as a layer with unevenness. As the resin of the resin binder, a curable resin such as an ionizing radiation curable resin is preferably used in the same manner as the hard coat layer described below in terms of surface strength and the like.

(Additional functional layer)
On the other hand, the additional functional layer is, for example, a surface physical property improving layer that improves surface physical properties, and specifically includes a hard coat layer and an antifouling layer. For example, the hard coat layer is usually provided on the outermost surface of the optical filter and is formed, for example, as a coating film using an ionizing radiation curable resin such as an acrylate monomer or a prepolymer. Also, the antifouling layer is usually provided on the outermost surface of the optical filter, and is formed as a coating film containing, for example, a fluorine resin or a silicone resin.

[Adhesive layer]
The adhesive layer is not particularly limited as long as it is transparent and can adhere to the conductor layer of the electromagnetic wave shielding sheet. Preferably, however, there is no air bubble remaining in the concave portion formed by the mesh opening in the mesh region of the conductor layer, etc., and even more preferably, there is no extra step for forming the flattening layer and no additional material. In order to adhere and laminate the optical filter to the electromagnetic wave shielding sheet, a fluid adhesive is preferable at least during lamination. A typical example of the fluid adhesive is a pressure-sensitive adhesive. Also, an adhesive or a hot-melt adhesive can be used because it fluidizes during bonding. The adhesive containing these pressure-sensitive adhesives may be a thermoplastic resin, or various curable resins such as thermosetting and ionizing radiation curable (in this case, the adhesive is completely cured after bonding with the electromagnetic wave shielding sheet). But it ’s okay. In addition, as an adhesive, an acrylic adhesive, a rubber adhesive, etc. are typical.
In addition, when a flattening layer is formed on a mesh surface such as a mesh-like region of the conductor layer and the concave portion formed by the opening of the mesh is filled and flattened, a fluid adhesive layer is not necessarily provided at the time of lamination. There is no need to use it.

  As the adhesive layer, a pressure-sensitive adhesive, that is, the pressure-sensitive adhesive layer is preferable in terms of easy adhesion lamination, etc., but when using a pressure-sensitive adhesive, the surface of the adhesive layer is protected until the lamination with the electromagnetic wave shielding sheet. A release sheet that peels off is preferably laminated on the surface. As the release sheet, a known release sheet such as a resin film or paper whose surface is appropriately peeled with silicone or a peelable resin may be appropriately used.

The adhesive layer is loaded immediately after the optical filter is laminated with the electromagnetic wave shielding sheet, after the unfinished optical filter in the state before the adhesive layer is formed, and the electromagnetic wave shielding sheet are loaded on the roll laminator, A desired optical filter may be prepared by forming the adhesive layer in-line on the machine until it is contacted and bonded and laminated.
Of course, an optical filter having an adhesive layer formed thereon may be loaded as a roll on a roll laminator.

<< (C) Step of exposing the grounding area of the electromagnetic wave shielding sheet; >>
In the step (C), as an optical filter, an adhesive layer is laminated on one surface, the adhesive layer side of the optical filter is directed to the conductor layer side of the electromagnetic wave shielding sheet, and the optical filter is In the electromagnetic wave shielding sheet, the electromagnetic wave shielding sheet is positioned in such a manner that the electromagnetic wave shielding sheet is located directly above a portion facing the image display area of the display, and is aligned so that the cut-out area of the optical filter faces a grounding-required portion of four rounds. In this step, the optical filter is bonded and laminated on the sheet, and the conductor layer is exposed at a place where the grounding of the electromagnetic wave shielding sheet 4 is necessary.

In the present invention, since the optical filter has a cutout region that is cut out from the grounding required region in the four circumferences of the grounding region of the electromagnetic wave shielding sheet, the cutout region allows the above-mentioned grounding region to be provided at the required grounding point. Thus, the conductor layer can be exposed.
In addition, in order to adhere | attach and laminate | stack an electromagnetic wave shielding sheet and an optical filter, it is good to use a well-known laminator. If the electromagnetic wave shielding sheet and the optical filter are each loaded in a roll laminator as a roll, a composite filter for display can be produced as a continuous belt-like sheet by roll-to-roll.

  Here, if it demonstrates in FIG. 4 illustrated in sectional drawing of 1 product unit, FIG. 4 (A) will show the optical filter 20 and the electromagnetic wave shielding sheet 10 before lamination | stacking. In the electromagnetic wave shielding sheet 10, the conductive layer 12 on the transparent substrate 11 has a mesh region 101 and a grounding region 102 around its circumference. Then, as shown in FIG. 4B, after these layers are stacked, the adhesive layer is exposed so that the portion of the optical filter 20 facing the grounding required portion of the grounding region 102 does not exist and the conductor layer 12 is exposed. 22, the composite filter 30 for display in which the optical filter 20 and the electromagnetic wave shielding sheet 10 are bonded and laminated. 4 is an example in which the adhesive layer 22 is laminated on one surface of the transparent base sheet 21 and the function-expressing layer 23 is laminated on the other surface, as described above.

<< (D) Single wafer cutting process; >>
In the step (D), the composite filter for display in the form of a continuous belt-like sheet in which the conductor layers are circumferentially connected and arranged in one direction is cut and separated for each unit corresponding to one display. It is a process. Preferably, the step (D) is provided after the step (C).
Thereby, the composite filter for display of the sheet-like sheet of a product unit is finally obtained. At this time, as illustrated in FIG. 3, when the margin 103 has the margin 103, the margin may be cut.
In addition, although the process of (D) may be performed by a machine different from the process of (C), it is more preferable from the viewpoint of productivity to perform continuously in-line with the same machine.
In addition, not only this process but performing continuously means performing by making a continuous strip | belt-shaped sheet | seat run continuously or intermittently.

<< Example of Production Example Including All Processes (A) to (D) >>
In addition, if one Example of a preferable manufacturing method is further mentioned here with respect to all the processes of said (A)-(C) thru | or (D) here, as a roll laminator, in the first half (unfinished before cutting) optical This roll laminator is used by adding a cutting device that cuts out the cutting area to the filter, and in the second half, a device that has a cutting device that cuts into sheet-like sheets in product units (the first half may be used in the width direction). In (A), the roll of the electromagnetic shielding sheet prepared in (A) is loaded, and the roll of the optical filter (unfinished before cutting) is loaded as the optical filter prepared in (B), and these rolls are unwound, (Incomplete before cutting) The optical filter is prepared in-line to the completed optical filter by cutting with a cutting device that cuts out the cut region. After bonding lamination was laminated on the shield sheet, to complete in-line as a sheet form a sheet product units as a step in the second half of device (D), a manufacturing method.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows notionally the manufacturing method of the composite filter for displays by this invention by a reference example (no frame-shaped area | region) , (A) is a top view, (B) is the cross section shown by the product unit corresponding to one display. Figure. The reference example (the frame-shaped area | region absence) of the electromagnetic wave shielding sheet used by this invention is shown by one state example after becoming a product unit, (A) is a top view, (B) is sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows one form example of the manufacturing method of the composite filter for displays by this invention notionally with a top view, (A) is a continuous strip sheet, (B) is a product unit corresponding to one display, When it became. Sectional drawing which shows each example of the optical filter which can be used by this invention, an electromagnetic wave shielding sheet (reference example; frame-shaped area | region) , and the composite filter for a display, (A) is an optical filter and an electromagnetic wave shielding sheet, (B) Is a composite filter for display. Explanatory drawing which illustrates notionally the manufacturing method of the composite filter for displays in a conventional method with a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic shielding sheet 11 Transparent base material 12 Conductor layer 20 Optical filter 21 Transparent base material sheet 22 Adhesive layer 23 Function expression layer 2c Cutout area 30 Display composite filter 3u Product unit 40 Portion which opposes display image display area 101 Mesh-like region 102 Grounding region 102a Frame-like region 103 Margin 103a Margin cut portion 104 Ungroundable region

Claims (2)

In the manufacturing method of a composite filter for a display comprising a laminate of an electromagnetic wave shielding sheet and an optical filter,
The manufacturing method of the composite filter for a display which has each process of following (A), (B), (C) at least.
(A) A step of preparing an electromagnetic wave shielding sheet; the electromagnetic wave shielding sheet is formed by laminating a transparent substrate and a conductor layer on one surface thereof in the thickness direction, and in a plane. The conductor layer includes a mesh region that can cover the entire image display region of the display to be applied, a grounding region that forms a mesh surrounding four circumferences of the meshed region, and the grounding region. 1 is a continuous belt-like sheet in which one unit formed by forming a frame-like region having no opening on the periphery is periodically connected and arranged in one direction.
(B) a step of preparing an optical filter; the optical filter is formed by laminating an adhesive layer on one surface, and all the portions of the electromagnetic wave shielding sheet facing the image display area of the display, and the grounding A continuous belt-like sheet having a shape and a dimension capable of covering at least a part of the working area, and an area facing a grounding required portion in the four circumferences of the grounding area of the electromagnetic wave shielding sheet is cut out. It consists of
(C) exposing the grounding area of the electromagnetic wave shielding sheet; the adhesive layer side of the optical filter is directed to the conductor layer side of the electromagnetic wave shielding sheet, and the optical filter is an image of the display on the electromagnetic wave shielding sheet Adhering the optical filter to the electromagnetic wave shielding sheet in an aligned state so as to face directly above the part facing the display area and so that the cut-out area of the optical filter faces a grounding required place of 4 rounds, Then, the conductor layer is exposed at the place where the grounding is required around the electromagnetic wave shielding sheet 4. The manufacturing method of the composite filter for displays of Claim 1 which has the following (D) process further after the said (C) process.
(D) Single wafer cutting step; cutting a composite filter for display in the form of a continuous belt-like sheet in which conductor layers are periodically connected and arranged in one direction for each unit corresponding to one display; Separate.

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