JP4777375B2 - Mesh sheet - Google Patents

Description

  The present invention is a mesh sheet used for a casing in various electronic devices such as a mobile terminal such as a television or a mobile phone, and is an antenna or a capacitive touch panel for transmitting and receiving terrestrial and satellite broadcast radio waves. It is related with the mesh sheet | seat used for etc.

  2. Description of the Related Art Conventionally, a housing member for an electronic device having functions such as an antenna and a capacitive touch panel is known. For example, an antenna having a resin molded product as a main constituent layer and a housing member having an opaque decorative portion, having a planar shape and a light transmittance of 70% or more on the front side of the layer to which the decorative portion is decorated An applicant has filed an application in which a conductive portion of an antenna pattern is made of a conductive thin film having a mesh structure, and the outline of each mesh is composed of a very narrow band having a substantially equal width (Patent Document 1). ).

  For example, as shown in FIG. 12, the casing member includes a mesh sheet 100 in which a metal mesh having a band width of 30 μm or less is laminated on a transparent support film, and has a light transmittance of 70% or more. It is comprised by bonding together with the molded product 101 which comprises a housing | casing.

  The metal mesh provided in the mesh sheet 100 has a mesh pattern as shown in FIGS. 13A and 13B. In the mesh pattern of FIG. 13A, the narrow bands are arranged in a lattice pattern. Further, the mesh pattern in FIG. 13B has a configuration in which regular hexagons are continuously arranged in a honeycomb shape. In this way, the metal mesh pattern has a configuration in which a mesh-shaped pattern composed of polygons is continuous.

  By the way, when this mesh sheet is bonded to a molded product as a housing member, the mesh sheet is inserted into a mold and in-mold molded. At this time, pressure and heat may be applied to the mesh sheet in advance, and the mesh sheet may be preformed into a shape along the outer shape of the molded product and then placed in the mold.

Then, the molten resin is injected into the cavity in the mold, and the mesh sheet in the mold and the molten resin are integrally molded to form a housing member with the mesh sheet attached to the surface of the molded product. To do.
International Publication WO2006 / 106982

  However, when forming the casing member as described above, it is necessary to deform the mesh sheet in a multiaxial manner along the outer shape of the casing by applying heat and pressure during injection or preforming. At this time, since the elongation rate of the metal is small, when a curved surface having a too large curvature, for example, when deformed so as to follow the edge portion of the molded product, stress is applied to the metal mesh composed of very thin strips, There was a problem that the narrow band could not withstand deformation and was disconnected, and the metal mesh was destroyed.

  Therefore, the technical problem to be solved by the present invention is to provide a mesh sheet that absorbs stress against deformation and can follow a curved surface having a large curvature without breaking the metal mesh.

  In order to solve the above technical problem, the present invention provides a mesh sheet having the following configuration.

According to the first aspect of the present invention, an arbitrary member having a curved surface is formed by laminating a metal mesh layer composed of a substantially equal-width narrow band on the surface of an insulating support base composed of a resin sheet. A mesh sheet for a casing of an electronic device, used by being adhered along a surface,
The metal mesh layer includes unit patterns that are continuously arranged in a multi-axis direction, and leg portions that are arranged to connect a plurality of the unit patterns from a plurality of positions with respect to the arbitrary one unit pattern,
The leg connected to the arbitrary unit pattern has a tensile force along the direction separating the adjacent unit patterns by multiaxially deforming the mesh sheet along the outer shape of the housing of the electronic device. When added to the unit pattern, all the connected portions of the leg part and the unit pattern that are connected to the unit pattern act in the same rotational direction so as to absorb the tensile stress applied to the leg part of the unit pattern. Provided is a mesh sheet characterized in that the mesh sheet is connected to the unit pattern with a proper inclination angle.

  According to a second aspect of the present invention, there is provided the mesh sheet according to the first aspect, wherein the narrow band constituting the mesh layer is configured such that the width of the narrow band is narrower than 40 μm.

  According to a third aspect of the present invention, there is provided the mesh sheet according to the first or second aspect, wherein the supporting base material and the metal mesh layer are pasted via a thermoplastic adhesive. .

  According to a fourth aspect of the present invention, there is provided the mesh sheet according to the third aspect, characterized in that the support substrate is composed of a thermoplastic resin.

  According to a fifth aspect of the present invention, there is provided the mesh sheet according to any one of the first to fourth aspects, wherein the unit pattern is configured as a closed figure having the same shape and size.

  According to a sixth aspect of the present invention, the unit pattern is formed of a circular closed figure arranged in a lattice pattern along two intersecting virtual axes, and the leg portion is at a connection point of the unit pattern. A mesh sheet according to a fifth aspect is provided, wherein the mesh sheet extends in the same direction from the normal direction, and is provided with at least three per unit pattern.

  According to the seventh aspect of the present invention, the unit pattern is configured by a rectangular closed figure, and the leg portion is formed on one side of the unit pattern from all the vertices of the unit pattern. A mesh sheet according to a fifth aspect is provided, characterized in that the mesh sheet is provided so as to extend along and be connected to the sides of four adjacent unit patterns.

  According to the eighth aspect of the present invention, the unit pattern is composed of rectangular closed figures arranged in a lattice pattern along two intersecting virtual axes, and the leg portion is a unit pattern for one unit pattern. Provided is a mesh sheet according to a fifth aspect, characterized in that all the vertices of a pattern are connected to the vertices of a unit pattern adjacent to each other along the virtual axis, and are provided so as to extend in a direction intersecting the virtual axis. .

According to the ninth aspect of the present invention, the unit pattern is constituted by a closed triangular figure in which the narrow band constituting the side is arranged inclined with respect to three intersecting virtual axes,
The leg portion is configured to be radially formed along the three virtual axes and connected to the apexes of the three adjacent unit patterns. A mesh sheet according to a fifth aspect is provided. To do.

  According to the present invention, when an extension force is applied to the mesh sheet, a stress is applied to the metal mesh layer so as to widen the interval between the unit patterns. At this time, if attention is paid to one unit pattern, since the leg portions are connected with an inclination angle, a force acts so that the unit pattern is rotated by a pulling force applied to the leg portions. As a result, the angle formed by the leg portion and the unit pattern changes. By changing the angle of the leg portion, the interval between the unit pattern and the adjacent unit pattern can be increased without cutting the leg strips, and the mesh pattern can be extended as a whole.

  Moreover, by making the fine band which comprises a metal mesh layer into 40 micrometers or less, a metal mesh layer can be made difficult to visually recognize and the mesh sheet excellent in the designability can be comprised. In this case, it is preferable that the supporting substrate is made of a transparent or translucent material.

  By configuring the adhesion between the metal mesh layer and the support substrate with a thermoplastic adhesive, if the plasticity is slightly increased by heat and an extension stress is applied to the strip of the metal mesh layer, the support substrate and the metal mesh layer It is possible to cause a slip of the relative position between the two, and to suppress the breakage of the fine band of the metal mesh layer. In this case, since the supporting base material is also made of a thermoplastic resin, the plasticity can be further increased, and the breakage of the narrow band due to the deformation due to the extension stress can be suppressed.

  The unit pattern is preferably configured as a closed figure having the same shape and size.

  Hereinafter, a mesh sheet according to an embodiment of the present invention will be described with reference to the drawings.

  First, as an example of the use of the mesh sheet according to the present invention, a case of a mobile phone terminal using the mesh sheet as an antenna will be described. The mesh sheet can be used for electronic devices other than mobile phone terminals, and can also be used as a capacitive touch panel in addition to an antenna.

  FIG. 1A is a diagram illustrating an external configuration of a casing of a mobile phone terminal using a mesh sheet according to the present embodiment. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A. The casing member 1 shown in FIG. 1A has a resin molded product 2 as a main component layer, and an antenna pattern formed of a mesh sheet 10 is formed on the surface of the resin molded product 2. As shown in FIG. 1B, the resin molded product 2 has a container-like shape with a transparent window portion 4, and is configured to be a curved surface portion 5 in which the periphery of the edge portion 3 is bent.

  The resin molded product 2 is molded into the shape of a desired casing member, and as the material thereof, polycarbonate, acrylic, polyethylene terephthalate, triacetyl cellulose, or the like can be used. Moreover, the transparent window part 4 may be comprised integrally by methods, such as two-color molding, for example, and the transparent comprised by another resin molded object in the opening for transparent window parts of the resin molded product 2 You may be comprised so that a member may be inserted.

  An opaque decorative part (not shown) may be provided on the surface of the resin molded product 2. Specifically, a decorative layer is provided on the surface of the resin molded product. As a method for forming the decorative layer, a transfer method or a simultaneous molding transfer method can be used. The transfer method uses a transfer material in which a transfer layer composed of a release layer, a decorative layer, an adhesive layer, and the like is formed on a base sheet, and heat-presses the transfer layer so as to adhere to the resin molded product 2 that is a transfer target Thereafter, the base sheet is peeled off, and only the transfer layer is transferred to the transfer surface for decoration. In addition, the molding simultaneous transfer method is a method in which a transfer material is sandwiched in a molding die, a resin is injected and filled in a cavity, and a resin molded product is obtained by cooling. In this method, the substrate sheet is peeled off and the transfer layer is transferred to the surface of the transfer object to decorate. In the simultaneous molding transfer method, since the adhesive strength of the resin molded product is high, the adhesive layer can be omitted. Moreover, it can also decorate by providing a decoration layer on the surface of the mesh sheet mentioned later.

  As the base sheet of the transfer material, a resin sheet such as polypropylene resin, polyethylene resin, polyamide resin, polyester resin, polyacrylic resin, or polyvinyl chloride resin can be used.

  The material of the release layer includes polyacrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, etc., as well as vinyl chloride-vinyl acetate. Copolymers such as polymer resins and ethylene-vinyl acetate copolymer resins may be used. When hardness is required for the release layer, a photocurable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, a thermosetting resin, or the like can be selected and used.

  As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for the material of the transfer object is appropriately used. For example, when the material of the transfer object is a polyacrylic resin, a polyacrylic resin may be used. In addition, when the material of the transferred material is a polyphenylene oxide copolymer, a polystyrene business polymer resin, a polycarbonate resin, a styrene resin, or a polystyrene blend resin, a polyacrylic resin having an affinity for these resins, A polystyrene resin, a polyamide resin, or the like may be used.

  A mesh sheet having an antenna pattern having a planar shape and a light transmittance of 70% or more is attached to the surface of the resin molded product 2. The mesh sheet 10 is configured over a wide area on the surface of the resin molded product 2, and is also provided on the surface of the curved surface portion 5. As will be described later, the mesh sheet 10 has a metal mesh layer composed of a metal ultrathin band having a mesh pattern. Since the metal mesh layer is opaque but is configured to be extremely thin, at first glance, the metal ultrathin band can be recognized only as a slight gradation change, which may impair the design of the resin molded product 2. Absent. In addition, a relatively large area can be used as an antenna, and reception sensitivity can be improved. Note that the mesh sheet may be provided up to the surface of the transparent window portion 4 for display.

  For example, the mesh sheet is adhered to the surface of the resin molded product 2 by the following process. As an example, when the resin molded product 2 is molded, the mold is closed with the mesh sheet sandwiched in the mold, and the molten resin is injected into the cavity. By comprising in this way, the mesh sheet | seat of the shape along the surface of a cavity and molten resin contact | adhere, and the mesh sheet | seat 10 can be stuck on the surface of the resin molded product 2. FIG.

  The mesh sheet sandwiched in the mold may be preformed in a shape along the cavity surface in advance. The preform is performed by pressing the mesh sheet while heating it using a press device for the preform. The mesh sheet is deformed by the pressing force of the pressing device or the injection pressure of the molten resin. In particular, in the portion corresponding to the corner of the resin molded product, the deformed portion extends simultaneously in the multiaxial direction.

  FIG. 2 is a cross-sectional view showing a configuration example of a mesh sheet used in the casing of the mobile phone terminal of FIG. 1A. The mesh sheet 10 has a configuration in which a metal mesh layer 13 is laminated on the surface of an insulating support sheet 11 made of a resin sheet. For bonding between the support sheet 11 and the metal mesh layer 13, an adhesive 12 made of a thermoplastic resin as a main raw material is used.

  As the support sheet 11, a resin sheet such as a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, a polyacrylic resin, or a polyvinyl chloride resin can be used.

  The adhesive layer 12 is preferably made of a material that slightly increases plasticity due to heat applied during preforming or injection of molten resin. Specifically, since the mesh sheet 10 is heated to approximately 180 ° C. at the time of preforming or molten resin injection, materials such as acrylic materials that increase plasticity at these temperatures can be used. . Further, as will be described later, the adhesive layer 12 is preferably configured to be slightly thicker (usually about 20 μm) to about 30 to 50 μm so as to be easily deformed during extension.

  The metal mesh layer 13 is made of a metal foil having a thickness of about 10 μm, and a metal thin film such as copper, nickel, aluminum, gold, or silver can be used. The metal mesh layer 13 is formed into a fine mesh pattern by, for example, photoetching or an etching method using a printing resist.

  When the mesh pattern is formed by photoetching, first, a metal foil 13a is attached to the surface of the support film 11, as shown in FIG. In FIG. 3, the description of the adhesive layer 12 is omitted. Next, a photoresist film (not shown) is formed, exposed using a photomask, and developed with a developer to form a mesh pattern of the resist film. This is etched with an etching solution, and the resist film is peeled off to form a metal mesh layer 13 having a mesh pattern made of ultrafine metal wires.

  As described above, the support sheet 11 and the metal mesh layer 13 extend in the multiaxial direction during deformation of the mesh sheet at the time of preforming or injection of molten resin. However, the metal constituting the metal mesh layer 13 has a smaller degree of extension than the resin constituting the support sheet 11 and may break during extension. In the mesh sheet according to the present embodiment, this problem is solved by devising the mesh pattern of the metal mesh layer 13 in order to solve the disconnection problem at the time of extension.

Specifically, the mesh pattern of the metal mesh layer 13 is arranged so as to connect a plurality of unit patterns from a symmetrical position with respect to the unit pattern continuously arranged in the multiaxial direction and the arbitrary one unit pattern. With legs that are
The leg connected to the arbitrary unit pattern has a tensile force along the direction separating the adjacent unit patterns, that is, a tensile force along the substantially extending direction of the leg is applied to the unit pattern. In this case, the leg portion connected to the unit pattern and the connecting portion of the unit pattern are all connected to the unit pattern with an inclination angle that acts in the same rotational direction. By constituting in this way, when an extension force is applied to the metal mesh layer 13, the unit pattern is rotated by the stress acting in the direction of separating the unit patterns applied to the strips constituting the unit pattern, and the unit pattern The mesh pattern can be extended as a whole by relaxing the angle formed between the pattern and the leg. Further, since the adhesive layer 12 is made of a material that slightly increases plasticity due to heat applied at the time of preforming or injection of the molten resin, when stress is applied to the strips of the mesh pattern, the support film 11 and the metal It deform | transforms between the mesh layers 13, causes both relative positions to slip, and suppresses the breakage of the strips of the metal mesh layer 13.

  The band width of the narrow band constituting the mesh pattern is approximately 40 μm or less. If the width of the narrow band is increased, the mesh pattern becomes easy to visually recognize, which causes the design of the casing to be impaired. However, the band width can be made larger than the above range in the use where the designability is not required.

(Mesh pattern configuration example 1)
FIG. 4A is a diagram illustrating a first configuration example of a mesh pattern of a mesh layer used in the mesh sheet of FIG. FIG. 4B is a partially enlarged view of FIG. 4A. Hereinafter, when the mesh pattern is illustrated, the unit pattern and the leg are indicated by using a solid line and a broken line at the leg, respectively. It has a connected configuration.

  As shown in FIG. 4A and FIG. 4B, the mesh pattern 20 is continuously arranged along the X-direction and Y-direction axes where the unit patterns 21 formed by deformed closed figures intersect each other. Then, four leg portions 22 are provided from one unit pattern.

  Specifically, taking the unit pattern 21a of FIG. 4B as an example, the four leg portions 22a provided in the circular unit pattern 21a are inclined from the direction of the normal H at the connection point 24 of the unit pattern 21a. It extends in the direction (in this configuration example, the tangent direction of the unit pattern at the connection point 24). The leg portions 22a provided in the unit pattern 21a are connected to the four unit patterns 21b adjacent to the unit pattern 21a in the X-axis direction and the Y-axis direction. The angle formed by the leg portion 22a and the adjacent unit pattern 21b is also connected so as to be in the tangential direction of the unit pattern 22b.

  When stress is applied in a direction in which the distance between the four unit patterns 21b connected to the unit pattern 21a is increased, the unit patterns 21a and 21b are subjected to an arrow 91 by the stress applied to the four leg portions 22a. Stress that rotates in the direction.

  5A is an enlarged view of the unit pattern before extension in FIG. 4A, and FIG. 5B is an enlarged view of the unit pattern after extension in FIG. 4A. In the mesh pattern having the configuration of FIG. 4A, the interval L1 between the adjacent unit patterns 21a and 21b increases to L2 as the mesh sheet extends. Moreover, the leg part 22 which connects unit patterns absorbs the tensile stress added to the leg part 22 by approaching the horizontal direction in the figure in the space | interval of this unit pattern. Specifically, the angle α is formed by the leg portion 22 and the unit pattern 21a before the extension, but becomes an angle β after the extension.

  By adopting such a configuration, even if the mesh sheet is deformed so as to extend, the mesh pattern is configured by the angle formed by the legs changing according to the distance between the unit patterns of the mesh pattern. It is prevented that the metal mesh is broken without breaking the narrow band.

  In addition, in the mesh sheet according to the present configuration example, the extension of the mesh pattern is realized by the deformation of the arc-shaped narrow band existing between the adjacent connection points 24 of the unit pattern by the tensile force applied to the leg portion. can do.

(Configuration example 2 of mesh pattern)
6 is a diagram illustrating a second configuration example of the mesh pattern of the mesh layer used in the mesh sheet of FIG. As shown in FIG. 6, in the mesh pattern 30, unit patterns 31a and 31b configured by square closed figures are arranged in a lattice pattern along the X axis and the Y axis perpendicular to each other. The unit patterns 31a and 31b are oriented such that their diagonal lines are along the X and Y axes.

  For each unit pattern 31a, four leg portions 32 are provided from each vertex 34 in a direction along the side. The four legs are connected to unit patterns 31b adjacent to each other in the X-axis and Y-axis directions of the unit pattern 31a. The connecting direction between the unit pattern 31b and the leg portion 32 is also the direction in which the leg portion 32 is along the side of the unit pattern.

  FIG. 7 is an enlarged view of the unit pattern after the extension of FIG. When stress is applied in a direction in which the distance between the unit patterns 31a and the unit patterns 31b connected to each other is increased, the unit patterns 31a and 31b rotate in the direction of the arrow 92 due to the stress applied to the four leg portions 32. Stress is applied. In the mesh pattern, the interval L1 (see FIG. 6) between the adjacent unit patterns 31a and 31b increases to L2 as the mesh sheet extends (see FIG. 7). In addition, the legs 32 connecting the unit patterns change in angle according to the interval between the unit patterns, and absorb the tensile stress applied to the legs 32.

  By adopting such a configuration, as shown in FIGS. 6 and 7, even if the mesh sheet is deformed so as to extend, the angle formed by the legs in accordance with the spread of the distance between the unit patterns of the mesh pattern As a result of the change, the metal mesh is prevented from being destroyed without disconnecting the fine bands constituting the mesh pattern.

(Mesh pattern configuration example 3)
FIG. 8 is a diagram illustrating a third configuration example of the mesh pattern of the mesh layer used in the mesh sheet of FIG. As shown in FIG. 8, in the mesh pattern 40, unit patterns 41a and 41b formed of square closed figures are arranged in a lattice pattern along the X axis and the Y axis that are orthogonal to each other. The unit patterns 41a and 41b are oriented so that their sides are along the X axis and the Y axis. The unit patterns 41a and 41b may be closed figures as will be described later, and may not be square.

  The leg part 42 is provided from each vertex 44 about one unit pattern 41a. The four legs extend in a direction intersecting the X axis and the Y axis. In the present embodiment, the leg 42 intersects the X axis and the Y axis at 45 °. Each leg portion 42 is connected to a unit pattern 41b adjacent to the unit pattern 41a in the X-axis and Y-axis directions.

  FIG. 9A is a diagram showing a state of deformation before and after extension of the mesh pattern of FIG. By adopting the configuration shown in FIG. 8, even if the mesh sheet is deformed so as to extend as shown in FIG. 9A, the angle formed by the legs changes according to the distance between the unit patterns of the mesh pattern. By doing so, it is possible to prevent the metal mesh from being destroyed without disconnecting the fine bands constituting the mesh pattern.

  FIG. 9B shows a modification of the configuration example 3 and a process of the modification. The mesh pattern shown in FIG. 9B is different from the mesh pattern shown in FIG. 8 in that the unit pattern is a rectangle.

(Configuration example 4 of mesh pattern)
FIG. 10 is a diagram illustrating a fourth configuration example of the mesh pattern of the mesh layer used in the mesh sheet of FIG. As shown in FIG. 10, the mesh pattern 50 is arranged along the X-axis, Ya-axis, and Yb-axis where unit patterns 51a and 51b configured by closed figures of regular triangles intersect each other (120 degrees in this configuration example). Is done. The unit patterns 51a and 51b are oriented such that the sides forming the triangle are slightly inclined (about 15 degrees) with respect to the X axis, the Ya axis, and the Yb axis.

  For one unit pattern 51a, a leg portion 52 is provided from each vertex. The leg part 52 extends along the side of the unit pattern. The leg portion 52 extending from one vertex is connected to the leg portions 52b of two unit patterns 51b adjacent to the unit pattern 51a. That is, the leg part 52 is comprised radially along the X-axis, Ya-axis, and Yb-axis, and it is comprised so that it may connect to the vertex of three adjacent unit patterns.

  FIG. 11A is a diagram showing a state of deformation before and after extension of the mesh pattern of FIG. By adopting the configuration shown in FIG. 10, even if the mesh sheet is deformed so as to extend as shown in FIG. 11, the angle formed by the legs changes according to the increase in the distance between the unit patterns of the mesh pattern. By doing so, it is possible to prevent the metal mesh from being destroyed without disconnecting the fine bands constituting the mesh pattern.

  FIG. 11B shows a modification of the configuration example 4 and a process of the modification. The mesh pattern in FIG. 11B is different from the mesh pattern in FIG. 10 in that the unit pattern is not an equilateral triangle.

  As described above, according to the mesh sheet of the present invention, when an extension force is applied to the mesh sheet, stress is applied to the metal mesh layer so as to widen the interval between the unit patterns. At this time, if attention is paid to one unit pattern, since the leg portions are connected with an inclination angle, a force acts so that the unit pattern is rotated by a pulling force applied to the leg portions. As a result, the angle formed by the leg portion and the unit pattern changes. By changing the angle of the leg portion, the interval between the unit pattern and the adjacent unit pattern can be increased without cutting the leg strips, and the mesh pattern can be extended as a whole.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect.

It is a figure which shows the external appearance structure of the housing | casing of the mobile telephone terminal using the mesh sheet | seat concerning this embodiment. It is sectional drawing in the IB-IB line | wire of FIG. 1A. It is sectional drawing which shows the structural example of the mesh sheet | seat used for the housing | casing of the mobile telephone terminal of FIG. 1A. It is process drawing which creates a mesh sheet by photoetching. It is a figure which shows the 1st structural example of the mesh pattern of the mesh layer used for the mesh sheet | seat of FIG. FIG. 4B is a partially enlarged view of FIG. 4A. FIG. 4B is an enlarged view of the unit pattern before extension in FIG. 4A. FIG. 4B is an enlarged view of the unit pattern after extension in FIG. 4A. It is a figure which shows the 2nd structural example of the mesh pattern of a mesh layer. It is a figure which shows the deformation | transformation after the extension of the unit pattern of FIG. It is a figure which shows the 3rd structural example of the mesh pattern of a mesh layer. It is a figure which shows the process of a deformation | transformation of the mesh pattern of FIG. It is a figure which shows the modification of the mesh pattern of a 3rd structural example, and the process of a deformation | transformation. It is a figure which shows the 4th structural example of the mesh pattern of a mesh layer. It is a figure which shows the process of a deformation | transformation of the mesh pattern of FIG. It is a figure which shows the modification of the mesh pattern of a 4th structural example, and the process of a deformation | transformation. It is a figure which shows the sticking state of a mesh sheet and a resin molded product. It is a figure which shows the structural example of the mesh pattern used for the conventional mesh sheet. It is a figure which shows the structural example of the mesh pattern used for the conventional mesh sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case member 2 Resin molded product 3 Edge part 4 Transparent window part 5 Curved surface part 10 Mesh sheet 11 Support sheet 12 Adhesive 13 Metal mesh layers 21, 31, 41, 51 Unit pattern 22, 32, 42, 52 Leg part 24, 34, 44, 54 connection point

Claims (9)

A metal mesh layer composed of narrow bands of approximately equal width is laminated on the surface of an insulating support base composed of a resin sheet, and is used by being stuck along the surface of any member having a curved surface. A mesh sheet for an electronic device casing ,
The metal mesh layer includes unit patterns that are continuously arranged in a multi-axis direction, and leg portions that are arranged to connect a plurality of the unit patterns from a plurality of positions with respect to the arbitrary one unit pattern,
The leg connected to the arbitrary unit pattern has a tensile force along the direction separating the adjacent unit patterns by multiaxially deforming the mesh sheet along the outer shape of the housing of the electronic device. When added to the unit pattern, all the connected portions of the leg part and the unit pattern that are connected to the unit pattern act in the same rotational direction so as to absorb the tensile stress applied to the leg part of the unit pattern. A mesh sheet characterized in that the mesh sheet is connected to the unit pattern with an arbitrary inclination angle.   The mesh sheet according to claim 1, wherein the narrow band constituting the mesh layer is configured such that the width of the narrow band is narrower than 40 µm.   The mesh sheet according to claim 1 or 2, wherein the supporting base material and the metal mesh layer are pasted through a thermoplastic adhesive.   The mesh sheet according to claim 3, wherein the support base is made of a thermoplastic resin.   The mesh sheet according to any one of claims 1 to 4, wherein the unit patterns are configured as closed figures having the same shape and size.   The unit pattern is composed of circular closed figures arranged in a lattice pattern along two intersecting virtual axes, and the leg portions are inclined in the same direction from the normal direction at the connection point of the unit pattern. The mesh sheet according to claim 5, wherein the mesh sheet is extended and provided at least three per unit pattern.   The unit pattern is composed of a rectangular closed figure, and the leg portion extends from all vertices of the unit pattern along all the sides constituting the unit pattern, and is adjacent to four unit patterns. The mesh sheet according to claim 5, wherein the mesh sheet is provided so as to be connected to the sides of the mesh sheet.   The unit pattern is composed of rectangular closed figures arranged in a lattice pattern along two intersecting virtual axes, and the leg portion is connected to all vertices of the unit pattern and the virtual axis for one unit pattern. The mesh sheet according to claim 5, wherein the mesh sheets are provided so as to connect vertices of unit patterns adjacent to each other and extend in a direction intersecting with the virtual axis. The unit pattern is composed of a triangular closed figure in which narrow bands constituting the sides are arranged to be inclined with respect to three intersecting virtual axes,
The mesh sheet according to claim 5, wherein the leg portion is configured to be connected radially to the apexes of the three unit patterns that are radially formed along the three virtual axes. .

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