JP2010238703A - Perforated insulating coating sheet and electromagnetic wave shielding material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and continuously manufacture an insulating coating sheet being a transparent coating layer by an electromagnetic wave shielding material for display without exfoliating unnecessary parts after lamination to form grounding electrodes in four directions. <P>SOLUTION: A perforated insulating coating sheet 10 is a continuous band-shaped sheet to which perforated opening groups 11 with a plurality of openings arranged at intervals in at least sheet width direction TD are provided at constant interval in a sheet length direction MD. On a transparent base substance 21 of an electromagnetic wave shielding material 30, a conductive material layer 22 having pattern areas 22A including image display areas and grounding areas 22B in four directions of the peripheral border is laminated to constitute a conductive material layer laminated sheet 20. The perforated insulating coating sheet is laminated on the conductive material layer laminated sheet to form a transparent coating layer 31. The conductive material layer of the grounding area as the grounding exposed part 32 is exposed at the perforated opening group at two sides facing each other in the MD direction. At two sides in the other TD direction, the perforated insulating coating sheet is narrow and the grounding exposed part 32A is formed as a continuous face in the MD and TD directions. Furthermore, the openings of the perforated group may be buried by the conductive layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave shielding material and a hole-insulating coating sheet used therefor, which are suitable for various uses, in particular, to be disposed on the front surface of a display.

Currently, as a display (also referred to as an image display device), a liquid crystal display (LCD), a plasma display panel (hereinafter also referred to as PDP), an electroluminescence (hereinafter referred to as a PDP), a flat panel display (FPD), in addition to a conventional cathode ray tube (CRT) display. Various displays such as EL) displays are in practical use. Among these, particularly, PDP emits an unnecessary electromagnetic wave, and therefore an electromagnetic wave shielding material is disposed on the front surface of the display.
In this way, when using an opaque conductive layer such as a metal layer in the electromagnetic wave shielding material disposed on the front surface of the display, in order to realize the light transmission as well as the electromagnetic wave shielding performance, The conductor layer is provided with a pattern region in which a large number of openings are formed in a mesh shape. On the other hand, the conductor layer at the outer edge of the electromagnetic wave shielding material needs to be grounded for the original purpose of the electromagnetic wave shield. For example, the conductor layer has all four sides of the peripheral edge of the pattern region. Around the periphery, a frame-shaped (rectangular frame-shaped) ground region without an opening is provided, and a ground electrode with a conductor layer exposed is provided there.
In the present specification, “electromagnetic wave” refers to an electromagnetic wave in a broad sense, particularly in the frequency band around kHz to GHz, visible light (or light), (near) infrared light. Those in the frequency band such as ultraviolet rays are referred to as “visible light (or light)”, “(near) infrared”, “ultraviolet”, etc., respectively.

  In addition to the original electromagnetic wave shielding function, the electromagnetic wave shielding material further provides optical filter functions such as near-infrared absorption, neon light absorption and antireflection, and prevents the conductor layer from being scratched. On the other hand, a transparent coating sheet such as an optical film is laminated and coated on the conductor layer as a transparent coating layer. Since this transparent coating layer usually includes a resin layer, it is an electrical insulator, and since the coating sheet is an electrically insulating insulating coating sheet, the ground electrode in the ground region of the conductor layer In order to ensure electrical continuity, an exposed structure in which the conductor layer is exposed is necessary.

For this reason, the sheet insulation coating sheet having a size slightly smaller than the ground area compared to the sheet conductor layer laminated sheet in which the conductor layer having the pattern area and the ground area is laminated on the transparent base material layer A method of forming a ground electrode by exposing the conductor layer around all four sides in a ground region provided around all four sides by pasting and laminating to the center of the conductor layer laminated sheet, or a ground region In addition, a method has been proposed in which a ground electrode is formed around all four sides by peeling off and removing the portion of the insulating cover sheet that is used as a ground electrode after the insulating cover sheet is once pasted and laminated on the entire surface (Patent Literature). 1, Patent Document 2).
Moreover, in order to peel off the insulation coating sheet, an unnecessary part is peeled off and removed at a cut portion put in the insulation coating sheet.

As described above, the method of forming the ground electrode in which the conductor layer is exposed without being obstructed by the transparent coating layer is roughly classified into the following methods (a) and (b). Is referred to as a partial lamination method, and the method (b) is also referred to as a peeling method.
(A) Method: A method of excluding the portion of the transparent coating layer facing the ground electrode in advance and laminating.
(B) Method: First, a transparent coating layer is laminated on the entire surface of a conductor layer, and then a portion to be a ground electrode is peeled off.

  Further, as a method capable of continuous treatment by the method (a) (hereinafter referred to as the method (a1)), a continuous strip-shaped insulating coating having a width slightly narrower than the sheet width of the continuous strip-shaped conductor laminated sheet. According to the method of sticking sheets continuously, the ground contact area can be exposed from the beginning on at least two sides facing each other in the width direction. However, in this state, the grounding regions on the two sides facing each other in the flow direction (longitudinal direction) are covered with the insulating coating sheet. Therefore, in the insulation coating sheet before lamination, depending on the shape of the grounding area to be exposed and the continuous belt-like sheet is not divided, leaving both ends in the width direction and providing a long hole in the width direction, If they are stacked, the grounding region can be exposed without applying the method (b) (Patent Document 3).

JP 11-12024 A (0016, FIG. 1) JP 2003-66854 A (Claim 1, 0018, FIG. 1) JP 2007-95915 A (FIG. 1)

By the way, it is preferable to provide the ground electrode on the four sides (that is, the four sides) of the periphery of the electromagnetic wave shielding material from the viewpoint of the ground performance. However, as the method for forming the ground electrode on such four sides, in the method (a), insulation is performed. It is difficult to increase the processing speed because the coating process of the coated sheet cannot be continuously processed by the roll-to-roll method by unrolling the coated sheet from the roll, and the insulating coated sheet is applied to each sheet. Moreover, there is a problem that high application position accuracy is required.
Here, the “roll-to-roll method” is a processing method of a sheet-like material, and unwinds and supplies the material to be processed from the take-up (roll) of the long belt-like sheet-like material, This means a processing method in which after a desired processing is performed, the material is again wound, wound, stored, and conveyed.

On the other hand, in the method (b), the pasting process can be continuous. However, when the cut is inserted into the insulating coating sheet, it becomes too deep and penetrates the conductor layer, and the conductor layer is cut or insulated. When peeling a covering sheet, there exists a problem that the adhesive force with a conductor layer is too strong, and it peels with a conductor layer.
In addition, in the method capable of continuous processing by the method (a1) described above, since the insulating coating sheet applied in a continuous band shape has holes that occupy most of the width direction in some places in the flow direction, the holes flow in the hole portion. It is necessary to pay attention to the sagging (sagging) of the insulation coating sheet during lamination, since the tension in the direction does not hang over the entire width direction with a uniform distribution. Further, stress is concentrated locally at the corners of the holes, and the insulating coating sheet is easily broken.

  That is, the object of the present invention is to provide an exposure for grounding that is exposed from a transparent coating layer as a grounding electrode with respect to an electromagnetic wave shielding material suitable for various uses, in particular, an application for shielding electromagnetic waves by placing it on the front of various displays such as PDP. Opening holes suitable for continuous production by the roll-to-roll method, where exposed parts for grounding can be easily provided on all sides without peeling after lamination of the insulation coating sheet as a transparent coating layer. An insulating coating sheet and an electromagnetic wave shielding material using the same are provided.

Therefore, the present invention provides a continuous belt-like sheet as an insulating coating sheet, and a group of holes in which a plurality of holes are arranged at intervals in the sheet width direction are provided at regular intervals in the sheet longitudinal direction. It was set as the perforated insulation coating sheet.

Further, the electromagnetic wave shielding material of the present invention is formed by laminating a conductive layer and a transparent coating layer made of an electrical insulator in this order on a transparent base material layer, and the conductive layer is located at the central portion. An electromagnetic wave shielding material comprising a pattern region having an opening, and a ground region electrically connected to the pattern region and located in the four sides of the periphery of the pattern region,
The opening insulating covering sheet is laminated as the transparent covering layer, and each grounding area along two sides facing in the longitudinal direction of the sheet is exposed for grounding in which the conductor layer is exposed by the opening group of the opening insulating covering sheet. Each of the ground contact regions along the two sides facing each other in the sheet width direction is narrower than the distance between the outer sides of the ground contact regions along the two sides Thus, an electromagnetic wave shielding material having an exposed portion for grounding in which the conductor layer was continuously exposed along the two sides was obtained.
In the electromagnetic wave shielding material of the present invention, in the above configuration, the conductive layer is further brought into contact with the conductor layer in a hole in the ground exposed portion where the conductor layer is exposed in the hole group. The conductive layer can be embedded to serve as a ground electrode.

  According to the present invention, there is an insulating transparent coating layer that covers the surface of the conductor layer in an electromagnetic wave shielding material that is suitable for use in shielding electromagnetic waves by being placed in front of various displays such as plasma displays. Without being obstructed, the ground electrode along the four sides is a perforated insulating coating sheet having a transparent coating layer, which can also be easily manufactured by continuous production using a continuous belt-like sheet.

That is, when the transparent coating layer is continuously formed by laminating continuous strip-shaped insulating coating sheets, the insulating coating sheet is formed by arranging a plurality of holes for forming grounding exposed portions at intervals in the sheet width direction. Hole groups are provided at regular intervals in the longitudinal direction of the sheet, and unnecessary portions on both side edges in the sheet width direction are left as an opening insulating coating sheet, so when continuously producing a continuous belt-like sheet, the sheet Since a sheet entity exists between a plurality of holes arranged in the width direction, the flow direction tension is applied uniformly in the entire sheet width direction, and the sheet can be prevented from being damaged and can be continuously produced easily.
In addition, the ground electrodes on both sides in the sheet width direction are laminated so that the width of the opening insulation covering sheet is narrower than the width of the conductor layer lamination sheet to be laminated, regardless of the opening group. It is sufficient to use a group of holes, which is advantageous for continuous production and cost.

The top view (A) and sectional drawing (B) which illustrate the hole insulation coating sheet (one division) and electromagnetic wave shielding material by one form by this invention. The top view which illustrates one form of the aperture group of an aperture insulation coating sheet in a continuous strip state. The top view which illustrates another form of the aperture group of an aperture insulation coating sheet for 1 division (for 1 screen). The top view which illustrates another form of the aperture group of an aperture insulation coating sheet in a continuous belt-like state. Sectional drawing which illustrates one form of the layer structure in an aperture-hole insulation coating sheet. Sectional drawing which illustrates one form which fills the exposed part for grounding of an electromagnetic wave shielding material with a conductive layer, and makes it a ground electrode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Overview>
First, FIG. 1 is a plan view illustrating an embodiment of one section (one screen) of an aperture insulating coating sheet 10 according to the present invention and an electromagnetic wave shielding material 30 to which the transparent coating layer 31 is applied. A) and the sectional view (B) in the AA line. The plan view is on the XY plane, and the cross-sectional view is on the XZ plane. Moreover, in FIG. 1 (A), sheet | seat longitudinal direction MD (flow direction; Machine Direction) in the continuous strip | belt-shaped sheet | seat state of the hole insulation coating sheet 10 applied as the transparent coating layer 31 at the time of manufacture of the electromagnetic wave shielding material 30; A sheet width direction TD (transverse direction) is also shown. The flow direction MD is the vertical direction of the drawing, and the width direction TD is the horizontal direction of the drawing.

  The electromagnetic wave shielding material 30 in the figure is a transparent coating layer 31 made of a perforated insulating coating sheet 10 that covers the conductor layer 22, and its layer structure is a transparent substrate as shown in FIG. With respect to the conductor layer laminate sheet 20 in which the pattern region 22A and the ground region 22B of the conductor layer 22 are laminated on the material layer 21 via the transparent adhesive layer 23, the pattern region 22A and the conductor layer 22 of the conductor layer 22 A transparent coating layer 31 is further laminated on the ground region 22B.

  In addition, as shown in FIG. 1A, the electromagnetic shielding material 30 in plan view has a rectangular conductive layer 22 in the central portion of the electromagnetic shielding material 30 as a pattern region 22A, and the electromagnetic shielding material 30 at the periphery thereof. The conductor layer 22 up to the outer edge is a ground region 22B electrically connected to the pattern region 22A. The transparent coating layer 31 covers the entire surface of the pattern region 22A of the conductor layer 22, and in the grounding region 22B, the sheet width direction corresponding to the horizontal direction of the drawing (the width direction perpendicular to the MD direction). TD), the ground region 22B is exposed by the transparent coating layer 31 formed by laminating the opening insulating coating sheet 10 having a width smaller than the width of the electromagnetic wave shielding material 10, and one in the MD direction and the width direction TD. A rectangular ground exposed portion 32A made of a continuous surface is formed along each of the left and right sides.

  On the other hand, in the grounding region 2B along two sides facing each other in the sheet longitudinal direction (MD direction) corresponding to the vertical direction of the drawing, the conductor layer 22 is exposed by the hole group 11 of the hole insulating covering sheet 10. Grounding exposed portions 32 are formed along each side. The hole group 11 is composed of a plurality of holes arranged at intervals.

  In this way, the perforated insulating covering sheet 10 according to the present invention is such that the perforated group 11 composed of a plurality of holes arranged at intervals is provided in the flow direction MD in the state of a continuous belt-like sheet at regular intervals. . This perforated insulating covering sheet 10 is used for forming an insulating and transparent transparent covering layer 31 using an optical filter or the like of the electromagnetic wave shielding material 30, and the pattern area 2A and the grounding area 2B are formed on the transparent base material layer 21. By laminating the continuous belt-like sheet of the hole insulating coating sheet 10 (transparent coating layer 31) having such a configuration on the continuous belt-like sheet of the conductor layer laminated sheet 20 in which the conductor layer 22 having the above-mentioned structure is laminated, The electromagnetic shielding material 30 provided with the ground electrodes along the four sides as the ground exposed portions 32 and 32A can be easily manufactured by a method suitable for continuous production.

In the plan view of FIG. 1A, the exposed portions of the grounding exposed portions 32 and 32A, which are portions where the conductor layer 22 is exposed, are indicated by solid lines, while these exposed portions are exposed. The transparent coating layer 31 is transparent to show the positional relationship with the pattern region 22A in the plan view, but the boundary line between the pattern region 22A and the ground region 22B of the conductor layer 22 is indicated by a broken line. The inside of the pattern region 22A is indicated by thin hatching.
And in the example of the figure, the earthing | grounding area | region 22B is all the area | regions which reach the outer edge of the electromagnetic wave shielding material 30 in the outer periphery all around the pattern area | region 22A.

  The present invention is described in further detail below.

<Open hole insulation coating sheet>
The perforated insulating covering sheet 10 is an electrically insulating continuous belt-like sheet, and a group of perforations 11 in which a plurality of holes are arranged at intervals in the sheet width direction TD are arranged at a constant distance in the flow direction MD (sheet longitudinal direction). It is the sheet | seat formed by separating. When the transparent covering layer 31 of the electromagnetic wave shielding material 30 is used, of course, it is transparent, and the exposed portion of the ground hole group 11 exposes the conductor layer 22 without being covered with the transparent covering layer 31 when covered. 32.
And the hole insulation coating sheet 10 becomes a functional layer which bears other functions other than various optical filters and an optical filter function, when making it the transparent coating layer 31. FIG.

[Open hole group]
The hole group 11 only needs to be formed at a constant interval in the flow direction MD in the state of the continuous belt-like sheet, and the position, shape, size, and the like of the hole in the hole group 11 The number is not particularly limited as long as it satisfies the performance required for the hole group 11. Accordingly, when the perforated insulation coating sheet 10 is applied to the transparent coating layer 31 of the electromagnetic wave shielding material 30 for display, there is no particular limitation as long as the ground exposed portion 32 that satisfies the ground performance can be formed. In addition, the said fixed space | interval is the distance of the flow direction MD for one division, and in the electromagnetic wave shielding material 30 for a display use, normally, one screen will be one division (refer FIG. 2 mentioned later).
However, in terms of grounding performance, the grounding exposed portion 32 is preferably located around the four sides of the quadrangular electromagnetic shielding material 30 as much as possible, so that a plurality of holes in the hole group 11 are also formed. It is preferable that the total hole area is as large as possible in the width direction. However, when applying tension in the flow direction to the continuous belt-like sheet and laminating the continuous belt-like conductor layer laminated sheet, in the sense of preventing deformation and breakage of the perforated insulating covering sheet, etc. It is preferable to provide an interval length that can prevent sheet deformation due to the interruption of the tension, and adjust the position, shape, size, number, and the like of each hole in the hole group.

  Here, FIG. 2 is a plan view illustrating one form of the hole group 11 of the hole insulating covering sheet 10 in the state of a continuous belt-like sheet. The hole group 11 here corresponds to three sections of a continuous belt-like sheet in which the perforated insulating coating sheet 10 (10u) illustrated in FIG. 1 is connected in the flow direction MD. The hole group 11 has a form having the hole group 11 along each boundary on both sides of the boundary between adjacent sections.

  FIG. 3 is a plan view illustrating another form of the hole group 11 of the hole insulating covering sheet 10 by one section 10u. The hole group 11 in the figure is an embodiment in which a plurality of holes are arranged in the sheet width direction TD (up and down direction in the drawing) with a plurality of holes arranged in a plurality (three in the drawing) in the flow direction MD. It is. The arrangement in the flow direction MD is a staggered pattern.

  FIG. 4 is a plan view illustrating another form of the hole group 11 of the hole insulating covering sheet 10 as a continuous belt-like sheet (three sections of one section 10u). The hole group 11 is in the form of the hole group 11 in which the boundary between both sections is located inside the holes constituting the hole group 11 across the boundary between adjacent sections.

As described above, the position, shape, size, number, interval, and the like of the holes constituting the hole group 11 are not particularly limited, and the grounding performance required as the ground exposed portion 32 of the electromagnetic wave shielding material 30 can be obtained. There is no particular limitation as long as it can be obtained. For example, the shape of the hole is a circle, an ellipse, a quadrangle (rectangle, square, etc.), a triangle, a pentagon, a polygon such as a hexagon, and the like. Among them, in the case of a circle, an ellipse, or a polygon, a shape having a smooth outer periphery such as a rounded corner is preferable because stress concentration on the outer periphery of the hole in a tensioned state is difficult to occur and the sheet is not easily divided. .
Further, the size (area per hole) is, for example, about 0.1 to 10 mm in the diameter of a circle in order to make the exposed portion for grounding of the electromagnetic wave shielding material, and the interval in the width direction of the holes is between the holes. The distance at which the sheet entity exists is about 10 to 20 mm.

  By the way, the method of forming the hole group is not particularly limited, and a known punching method may be appropriately employed. However, in terms of continuous productivity, a method that can be processed as a continuous belt-like sheet is preferable. An example of such a punching method is laser processing. Laser processing is non-contact processing, and includes cutting processing for cutting the outline of a hole with a laser, or evaporation processing for evaporating the entire surface of the hole with a laser. In addition to laser, there are methods such as contact cutting with a punch made of metal such as iron, ceramics, etc., fine vibration type tool (ultrasonic cutting method), and burning with a heating blade.

  The punching of the hole group may be performed in advance by offline processing on an apparatus for coating an object with the hole insulating coating sheet, or may be performed by inline processing on the apparatus. In the case of off-line processing, a device for coating an object with a hole insulation coating sheet is loaded as a hole insulation coating sheet in which a hole group has already been formed. In the case of in-line processing, a material sheet to be formed with a hole group is loaded into a coating apparatus, and the hole group is punched in the apparatus and the subsequent coating process is continuously performed. The latter in-line processing is preferable in that both processing steps can be continuously processed with a single apparatus as a continuous belt-like sheet.

[Layer structure]
Next, the layer structure of the perforated insulation coating sheet 10 will be described.
The perforated insulating covering sheet 10 is a transparent sheet that becomes a functional layer having various functions other than various optical filters and optical filter functions when it is used for the transparent covering layer 31 of the electromagnetic wave shielding material 30 for display applications. . As these optical filters and the like, conventionally known electromagnetic wave shielding materials 30 can be appropriately used. Here, the optical filter and other functional layers will be described.

  FIG. 5 is a cross-sectional view showing an example of the layer configuration of the perforated insulating coating sheet 10 (or the transparent coating layer 31). In the opening insulating covering sheet 10 illustrated in the figure, the transparent substrate sheet 12 is laminated on one surface with a function expressing layer 13 serving as an optical filter and other functional layers, and the other surface is laminated with an adhesive layer 14. In addition, the structure further includes a group of holes 11 penetrating all these layers.

(Transparent substrate sheet)
In addition, what is necessary is just to use a well-known transparent material for the transparent base material sheet 12, and when the transparency in visible light region, heat resistance, mechanical strength, etc. are considered, a resin film (or sheet | seat) is typical. is there. The resin of the resin film (or sheet) is, for example, a polyester resin, an acrylic resin, a polycarbonate resin, a polyimide resin, a polyolefin resin such as a cycloolefin polymer, or a cellulose resin such as triacetyl cellulose. . Among these, a biaxially stretched polyethylene terephthalate film is a suitable material. The thickness of the transparent substrate sheet is usually 12 to 500 μm, preferably 25 to 200 μm, from the viewpoints of handleability and cost, but is not particularly limited.

(Functional expression layer)
One of the function expressing layers 13 is an optical filter that realizes an optical filter function.
As an optical filter, a known optical filter, for example, its optical function includes a near infrared absorbing function that absorbs near infrared rays, an ultraviolet absorbing function that absorbs ultraviolet rays, or neon light of a PDP display that provides a visual effect. Specific light transmission function such as neon light absorption function to absorb, color correction function to correct the displayed image to the desired color tone, anti-reflection function (any of anti-glare, anti-reflection, anti-glare and anti-reflection), outside by micro louver Such as anti-reflection function. The optical filter has one or two or more of these functions, and can share a plurality of functions by a single layer or multilayer structure.

  These various optical filter functions, for example, near infrared absorption function, neon light absorption function, color correction function, etc., using dyes corresponding to these functions (near infrared absorption dye, neon light absorption dye, color correction dye), The ultraviolet absorbing function can be realized by a known material / method such as using an ultraviolet absorber. For example, a resin layer in which these materials are dispersed in a resin can be used as an optical filter by a known coating method, extrusion method, or the like.

Other functional layers as the function-expressing layer include known functional layers, for example, a planarizing resin layer that planarizes unevenness in the pattern region of the conductor layer, a surface of the conductor layer and the optical filter as its function. These include a surface protective layer to be protected, a hard coat layer, an antistatic layer, a contamination preventive layer, an impact resistant layer, or an adhesive layer (including a pressure-sensitive adhesive layer) that closely adheres two layers. These functional layers are laminated in a single layer or multiple layers, and a single layer may be used for a plurality of functions.
In addition, the function expressing layer such as an optical filter may also serve as a transparent substrate sheet.

(Adhesive layer)
The adhesive layer 14 is for adhering the perforated insulating coating sheet 10 to other objects, and is referred to as an adhesive layer including the adhesive layer. What is necessary is just to provide the contact bonding layer as a hole insulation coating sheet suitably as needed, when not giving an adhesive agent to the conductor layer lamination sheet side. Moreover, this adhesive layer is transparent in order to make the perforated insulating coating sheet a transparent coating layer. As the adhesive layer, a known adhesive (including an adhesive), a resin, or the like may be used as appropriate. For example, urethane adhesive, acrylic adhesive, epoxy adhesive, rubber adhesive, and the like.

In addition, when the adhesive layer 14 is an adhesion layer in the hole insulation coating sheet 10 illustrated in FIG. 5, a separator film that protects the adhesion surface is usually provided (not shown).
In addition, when the separator film is also provided, the holes of the hole group 11 are in a half-cut state in which the separator film is not cut and the thickness is left (A), and in which the separator film is also cut ( B). In the half-cut form (A), there are a form (A1) in which all the cut layers on the cut separator film are held and placed and a form (A2) in which they are removed. Moreover, in the said half cut form (A), there exists a form (Aa) which the adhesive layer cut | disconnects the full thickness by the cutting | disconnection from the function expression layer side, and a form (Ab) which does not cut | disconnect the full thickness. In addition, a desirable form is a form (Aa) rather than a form (Ab), and a form (A1) is desirable at the point from which a cutting waste can be removed on a separator film. Of course, in the form (A1), the cutting waste and the separator film may be separated from the sheet main body separately, and the method for removing these unnecessary materials is not particularly limited as the perforated insulating coating sheet 10. .

<Electromagnetic wave shielding material>
As described above, the electromagnetic wave shielding material 30 according to the present invention has the grounding structure in which the conductor layer 22 is exposed as the grounding exposed portions 32 and 32A, and the grounding exposure along each side of the quadrilateral electromagnetic wave shielding material 30. The part is formed by the hole group 11 of the hole insulating covering sheet 10 along the two sides facing the pair of sheets in the longitudinal direction, and the two parts facing the other sheet width direction. The grounding exposed portion 32A along the side is narrower than the distance between the outer edges (in the width direction TD) of the two grounding regions along the two opposing sides of the electromagnetic wave shielding material 30 (the outer width of the two grounding regions 22B). The perforated insulating covering sheet 10 is formed. The former grounding exposed portion 32 is opposed in the sheet longitudinal direction MD (along the side extending in the sheet width direction TD), and the latter grounding exposed portion 32A is formed in the sheet width direction TD. (Which is along the side extending in the longitudinal direction MD of the sheet).

[Exposed part for grounding]
As described above, when the ground exposed portions 32 (and 32A) are provided along each side of the electromagnetic wave shielding material 30, the sheet width when the perforated insulating coating sheet 10 is laminated with a continuous belt-like sheet as a transparent coating layer. A pair of ground exposed portions 32A along two opposing sides (in the direction TD) are formed by the partial lamination method using the narrow hole insulating covering sheet 10 without depending on the hole group 11, while the sheet longitudinal direction In the pair of grounding regions 22B along the other two sides facing each other in the MD direction, the grounding exposed portion 32 is formed using the hole group 11, and these forming methods are combined to form the four sides. It is preferable in terms of continuous productivity, cost, and the like, rather than forming exposed portions for grounding on all sides with the hole group 11.

  As described above, the exposed portion 32 for grounding has the hole shape described in the above-described hole group 11, and the position, shape, size, number, interval, etc. of the holes have already been determined. Since it was described in the case of the sheet 10, the description thereof is omitted here.

  Next, the conductor layer laminated sheet 20 and each layer such as the transparent base material layer 21 and the conductor layer 22 constituting the same will be described. In addition, these can select a well-known thing suitably.

[Conductor layer laminate sheet]
It is preferable from the viewpoint of continuous productivity that the transparent base material layer 21 and the conductor layer 22 are prepared as a continuous belt-like sheet as the conductor layer laminated sheet 20.

(Transparent substrate layer)
As the transparent base material layer 21, the materials listed in the transparent base material sheet 12 of the aperture insulating coating sheet 10 can be used. For example, a biaxially stretched polyethylene terephthalate film is a suitable material.

(Conductor layer)
The conductor layer 22 is a layer that requires the pattern region 22A to ensure light transmission, and the layer itself is an opaque layer. The conductor layer 22 also includes a ground region 22B that is electrically connected to the pattern region 22A for grounding a portion around the pattern region 22A that does not affect image display. Such a conductor layer 22 may be a known one, and is typically a metal layer such as copper or aluminum, or a conductive composition layer in which conductive particles are dispersed in a resin binder. The metal layer is usually formed from a metal foil.
Here, “electrically connected” means that (1) both the pattern region 22A and the ground region 22B electrically connected are composed of one continuous conductor layer 22 from the beginning. (2) A mode in which both the pattern region 22A and the grounding region 22B originally manufactured as separate separated members are joined (or bonded) in a state where electrical continuity is ensured as appropriate. 3) First, one of both the pattern area 22A and the ground area 22B is manufactured first, and then the other is manufactured in a timely manner, adjacent to the one and ensuring mutual conduction. Any of the three forms may be used.
The thickness of the conductor layer 22 is usually about 2 to 100 μm, more preferably about 5 to 20 μm, from the viewpoints of electromagnetic shielding performance, flexibility, processability, material cost, and the like.

Moreover, when the conductor layer 22 is a metal layer derived from copper foil or the like, it is preferable that the surface of the conductor layer 22 in the pattern region 22A has a blackening treatment layer in order to improve contrast. What is necessary is just to employ | adopt suitably a well-known thing in an electromagnetic wave shielding material as a blackening process layer. For example, an inorganic material such as metal or an organic material such as black resin is used for the blackening treatment layer. The inorganic material is, for example, a metal compound such as metal or alloy, metal oxide, metal sulfide, and the like, and a blackening treatment layer is formed by a known blackening treatment such as a plating method. The black resin is a composition containing, for example, a black colorant in the resin, and forms a blackening treatment layer as a black resin layer.
In addition, when this blackening process layer consists of an electrical insulator, this blackening process layer is also the object which should be removed with a transparent coating layer. In this case, from the viewpoint of work suitability, first, the ground exposed portion facing the hole group 11 and the blackening treatment layer in the vicinity thereof are removed, and then the hole insulating covering sheet 10 is pasted. It is preferable to attach. If these blackening treatment layers are made of a conductor, they are regarded as a part of the conductor layer 22 referred to in the present specification and are excluded from removal.

  The plan view shape of the pattern in the pattern region 22A is not particularly limited and may be a known shape, such as a mesh shape (lattice pattern), a stripe shape (a linear stripe pattern, a spiral pattern, or the like). Of these, a mesh shape and a square lattice shape are typical. The pattern may be formed by a known method such as chemical etching or printing.

  On the other hand, the grounding region 22B does not have an opening provided for ensuring light transmission in the pattern region 22A, or even if it exists, the occupation area ratio may be small.

[Conductive layer]
The conductive layer 33 is a kind of further conductive treatment for the ground exposed portion 32 using the hole group 11, and the conductor layer exposed at the bottom of the ground exposed portion 32 exposed by the hole of the hole group 11. Rather than using 22 as a ground electrode, the hole surrounding the exposed portion 32 for grounding is filled with a conductive layer 33, and this conductive layer 33 is used as a ground electrode. Here, FIG. 6 is a partially enlarged cross-sectional view of the periphery of the grounding exposed portion 32 formed by the hole group 11. The electromagnetic wave shielding material 10 illustrated in FIG. 6 applies the conductive layer 33 to the grounding exposed portion 32. It is one form.

  As the conductive layer 33, a conductive paste, solder, or the like can be used. The solder is preferably a low melting point solder considering the heat resistance of the resin layer such as the transparent base material sheet 12 of the hole insulating covering sheet 10, for example, a low melting point solder having a melting point of 70 to 80 ° C. and 200 ° C. or less. is there. The conductive layer 33 is formed by a known application method such as application or printing of a conductive paste or solder.

Further, as in the embodiment of FIG. 6, the conductive layer 33 has a transparent covering layer 31 (open hole insulation) so that adjacent holes are connected by the conductive layer 33 with respect to a plurality of holes constituting the hole group 11. It may be formed across the surface of the covering sheet 10), may be formed by filling the holes of the hole group 11, and may be spread over the surface around the holes. FIG. 6 shows an example in which the conductive layer 33 completely fills the holes and spreads on the surface of the transparent coating layer 31 and further spans between adjacent holes, and the holes are electrically connected by the conductive layer 33. is there.
In this manner, by further providing the conductive layer 33, the electrically conductive surface rises higher than the bottom surface of the hole, so that the ground connection by a ground member such as a conductive tape becomes easier.

[Other layers: transparent adhesive layer, etc.]
The transparent adhesive layer 23 is a layer for fixing the conductor layer 22 to the transparent substrate layer 21. For example, when the conductor layer is formed from a copper foil, the copper foil is bonded and fixed to the transparent substrate layer. Used to keep it. The adhesive referred to here includes a pressure-sensitive adhesive. As the transparent adhesive layer, a known adhesive may be appropriately used as long as it is transparent. For example, urethane adhesive, acrylic adhesive, epoxy adhesive, rubber adhesive, and the like.
In addition, if a conductor layer adheres to a transparent base material layer without a transparent adhesive layer, a transparent adhesive layer can be omitted. For example, the conductive layer is formed as a conductive composition layer on the transparent substrate layer by a printing method of the conductive composition.

  Although not shown, for example, an adhesive layer for adhering to an adherend such as a display front plate on the surface of the transparent substrate layer 21 on the side opposite to the side where the conductor layer 22 is laminated, Other layers such as a separator film may be laminated.

<Method for producing electromagnetic shielding material>
Here, the manufacturing method of the electromagnetic wave shielding material 30 according to the present invention will be described. The electromagnetic wave shielding material 30 according to the present invention can be manufactured by affixing and forming the perforated insulating coating sheet 10 as the transparent coating layer 31. If the perforated insulation coating sheet 10 is attached to the surface of the conductor layer 22 of the conductor layer laminated sheet 20 in which the conductor layer 22 having the pattern region 22A and the ground region 22B is laminated on the transparent base material layer 21, The electromagnetic wave shielding material 30 is obtained. By using the perforated insulating covering sheet 10, a grounding structure provided with grounding exposed portions serving as ground electrodes along all four sides can be used to cut the conductor layer or attach the insulating covering sheet. By avoiding problems such as tarmi, continuous production can be continued as a continuous sheet.

That is, as a method for producing an electromagnetic wave shielding material, a conductive layer and a transparent coating layer made of an electrical insulator are laminated in this order on a transparent base material layer, and the conductive layer is located at the central portion. A pattern region having an opening, and a grounding region that is electrically connected to the pattern region and located in the four sides of the peripheral portion of the pattern region, and the above-described perforated insulating coating sheet is used as the transparent coating layer. Each of the grounding regions that are stacked and extend along two sides facing each other in the sheet longitudinal direction has a grounding exposed portion in which the conductor layer is exposed by the hole group of the hole insulating covering sheet, and the two grounding regions facing each other in the sheet width direction. Each grounding region along the side is narrower than the distance between the outer sides in the direction toward the two sides of the grounding regions along the two sides of the laminated insulating sheet covering the holes. Layer exposed continuously along the two sides It has an exposed ground unit, a method for producing an electromagnetic wave shielding material,
As a conductor layer laminated sheet, a conductor layer is laminated in this order on a transparent base material layer. The conductor layer is located in a central portion and has a pattern region having an opening, and the pattern region Preparing a continuous belt-like sheet consisting of a ground region located on the four sides of the peripheral edge of the pattern region, and a conductor layer laminated sheet preparation step (A step);
As the perforated insulation coating sheet, a group of perforations in which a plurality of holes are arranged at intervals in the sheet width direction are provided at regular intervals in the sheet longitudinal direction, and the sheet width is opposite in the width direction of the conductor layer laminated sheet. A hole insulation coating sheet preparation step (B step), which is a continuous belt-like sheet and has a transparent electrical insulation hole insulation coating sheet that is narrower than the distance between the outsides of both of the ground contact areas;
It is a manufacturing method of the electromagnetic wave shielding material which has the affixing process (C process) which laminates | stacks the said hole insulation coating sheet on the said conductor layer lamination sheet in the state of a continuous strip | belt-shaped sheet | seat.

For example, the conductor layer laminated sheet 20 is provided with a mesh-shaped pattern region 22A and a grounding region 22B by chemically etching a copper foil bonded with a transparent adhesive layer 23 to a transparent base material layer 21 of a continuous belt-like polyester sheet. A conductive layer 22 is formed and prepared.
On the other hand, if the hole insulation coating sheet 10 is an optical filter sheet or the like, it is prepared by forming the hole group 11 on a continuous belt-like sheet made of a resin sheet or the like by a punching press or a laser.
And this hole insulation coating sheet 10 is laminated | stacked on the said conductor layer lamination sheet 20 with a laminator etc., and the target electromagnetic wave shielding material 30 is manufactured continuously. The laminator is equipped with a punching press, a device for forming a hole group such as a laser, etc., and the B process and the C process in the preparation of the hole insulating coating sheet (formation of the hole group) and the attaching process are the same. It can also be carried out continuously on the apparatus.

In addition, the pasting process can be performed continuously with both continuous sheets, and roll-to-roll continuous production is possible. That is, both the opening insulating covering sheet 10 and the conductor layer laminated sheet 20 can be supplied as a continuous belt-like sheet from a roll, and can be bonded together as a continuous belt-like sheet. In addition, as described above, the perforated insulation coating sheet 10 is supplied as a continuous strip-shaped sheet from the roll as the pre-perforation insulation coating sheet before the perforation group formation, and the perforated insulation sheet is formed immediately before bonding. After the pre-insulation coating sheet is completed, it may be bonded. All of these processes can be processed continuously on a single device. Roll-to-roll continuous production is possible.
And what was bonded together can be manufactured to the electromagnetic wave shielding material 30 for every screen, if it cut | disconnects to the division for every screen. The cutting is performed inline on the same device or offline with another device.

  In addition, the removal / collection of the cutting waste during the formation of the hole group 11 is the removal / collection of the separator film both in the half cut form (A) in which the hole is formed and in the full cut form (B) in which the separator film is also cut. May be performed immediately before lamination (bonding) with the conductor layer lamination sheet. At this time, removal and collection of each layer on the separator film may be performed simultaneously in a state of being integrated with the separator film. Alternatively, each layer on the separator film may be removed and collected before the separator film is removed and collected.

Moreover, in this invention, when manufacturing an electromagnetic wave shielding material, as long as it is in the range which does not deviate from the main point of this invention, you may implement other processes other than having mentioned above at any time.
For example, a process of laminating a pressure-sensitive adhesive layer or a separator film for attaching to an adherend such as a display front plate on the surface of the transparent base material layer 21 opposite to the side on which the conductor layer 22 is laminated. Etc. The pressure-sensitive adhesive layer and the separator film thereof may be before or after the bonding of the conductor layer laminated sheet and the aperture insulating coating sheet. The front means bonding means in-line processing or off-line processing, and the rear means bonding and in-line processing or off-line processing.
Further, the slit processing step for narrowing the sheet width of the perforated insulating coating sheet 10 so that the ground exposed portion 32A can be formed may be provided by in-line processing performed on the same apparatus as the bonding step.
The electromagnetic wave shielding material of the present invention can be used for various applications. In particular, front filters for image display devices such as PDPs, CRTs, LCDs and ELs used in television receivers, various measuring devices and instruments, various office devices, various medical devices, computing devices, display units of telephones, etc. It is suitable for use, particularly for PDP. In addition, for electromagnetic wave and infrared ray shielding applications such as windows for buildings such as houses, schools, hospitals, offices, stores, vehicles for vehicles such as vehicles, airplanes and ships, and windows for various home appliances such as microwave ovens. It can be used.

DESCRIPTION OF SYMBOLS 10 Open hole insulation coating sheet 10u One division 11 Open hole group 12 Transparent base material sheet 13 Function expression layer 14 Adhesive layer (including adhesion layer)
DESCRIPTION OF SYMBOLS 20 Conductor layer laminated sheet 21 Transparent base material layer 22 Conductor layer 22A Pattern area of conductor layer 22B Ground area of conductor layer 23 Transparent adhesive layer 30 Electromagnetic wave shielding material 31 Transparent covering layer (open hole insulating covering sheet)
32 Exposed portion for grounding 32A Exposed portion for grounding (due to narrowness) 33 Conductor layer MD Sheet longitudinal direction (flow direction)
TD Sheet width direction

Claims (3)

  An electrically insulating perforated insulating covering sheet, which is a continuous belt-like sheet, and is provided with a group of perforations arranged at least at intervals in the sheet width direction. On the transparent base material layer, a conductor layer and a transparent coating layer made of an electrical insulator are laminated in this order, and the conductor layer is located in the center portion and has a pattern region having an aperture, and the An electromagnetic shielding material comprising an electrical connection with a pattern region and a grounding region located on four sides of the peripheral edge of the pattern region,
The perforated insulating covering sheet according to claim 1 is laminated as the transparent covering layer, and each ground region along two sides facing in the longitudinal direction of the sheet exposes the conductor layer by the perforated group of the perforated insulating covering sheet. Each of the grounding areas along the two sides facing each other in the sheet width direction is narrower than the distance between the outer sides of the grounding areas along the two sides. An electromagnetic wave shielding material having an exposed portion for grounding in which the conductor layer is continuously exposed along the two sides because of the width. 3. The conductive layer is used as a ground electrode by embedding the conductive layer in contact with the conductive layer in a hole in the ground exposed portion where the conductive layer is exposed in the hole group. Electromagnetic wave shielding material.

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