Covering materials and display devices

Abstract

Suppressing the reduction of rigidity. The covering material (10) forms a bend in a first direction (X) and a bend in a second direction (Y), the bend in the first direction (X) and the bend in the second direction (Y) intersect within the surface of the covering material (10), the curvature radius of the bend in the first direction (X) is 60 mm to 300 mm, and the curvature radius of the bend in the second direction (Y) is 1000 mm to 14000 mm.

Description

Technical Field

[0001] The present invention relates to a covering material and a display device. Background Art

[0002] In recent years, the appearance design of the instrument display part etc. mounted on the vehicle has become more complicated, and therefore the design of the resin covering material and cover glass covering the surface of the display part has also become more complicated (Patent Document 1). In particular, the demand for covering materials with one-way bending of transparent plates and covering materials with large bending including flat parts is increasing. On the other hand, the safety requirements for covering materials (especially glass plates) used in the vehicle are very high. In addition, the curved covering materials are not limited to such in-vehicle uses, and are needed in any use.

[0003] Patent Document 1: International Publication No. 2018 / 168387 Summary of the invention

[0004] However, the rigidity of the curved covering material is reduced, so there is a possibility that the influence of vibration becomes greater or the shape change becomes greater when pressure is applied to the surface. Therefore, it is required to suppress the reduction of rigidity for the curved covering material.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a covering material which suppresses a decrease in rigidity.

[0006] In order to solve the above-mentioned problems and achieve the purpose, the covering material disclosed in the present invention is a covering material that forms a bend in a first direction and a bend in a second direction, the bend in the first direction and the bend in the second direction intersect within the surface of the above-mentioned covering material, the curvature radius of the bend in the first direction is 60mm~300mm, and the curvature radius of the bend in the second direction is 1000mm~14000mm.

[0007] In order to solve the above problems and achieve the purpose, a display device of the present disclosure includes the above-mentioned cover material.

[0008] According to the present invention, a decrease in rigidity can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram showing the vehicle-mounted display according to the present embodiment.

[0010] Figure 2 Schematic diagram of the covering material of this embodiment.

[0011] Figure 3 It is a schematic cross-sectional view of the covering material of this embodiment.

[0012] Figure 4 It is a schematic cross-sectional view of the covering material of this embodiment.

[0013] Figure 5 Schematic diagram of the cross section of the covering material and the functional membrane.

[0014] Figure 6 It is a schematic diagram showing another example of the shape of the covering material according to the present embodiment.

[0015] Figure 7 It is a schematic diagram showing another example of the shape of the covering material according to the present embodiment.

[0016] Figure 8 It is a schematic diagram showing another example of the shape of the covering material according to the present embodiment.

[0017] Fig. 9 It is a schematic diagram showing another example of the shape of the covering material according to the present embodiment.

[0018] Fig.10 It is a schematic diagram showing another example of the shape of the covering material according to the present embodiment.

[0019] Fig.11 This is a schematic diagram for explaining the rigidity evaluation.

[0020] Fig.12 This is a schematic diagram for explaining the rigidity evaluation.

[0021] Fig.13 This is a schematic diagram for explaining the evaluation of the shape change when the surface pressure is applied.

[0022] Fig.14 This is a schematic diagram for explaining the evaluation of the shape change when the surface pressure is applied. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments, and when there are multiple embodiments, embodiments formed by combining the embodiments are also included. In addition, numerical values ​​include rounded ranges.

[0024] (In-vehicle display)

[0025] Figure 1 Schematic diagram showing a vehicle-mounted display according to this embodiment. Figure 1 As shown, the covering material 10 of this embodiment is provided on the vehicle-mounted display 2 and is used as a covering material on the surface of the vehicle-mounted display. The vehicle-mounted display 2 is a display device provided in the vehicle, for example, provided in front of the steering shaft 1 in the vehicle. The vehicle-mounted display 2 displays, for example, a car navigation screen, various instruments such as a speedometer, and a start button. Figure 2The structure of is an example, and the vehicle-mounted display 2 to which the covering material 10 is applied may have any structure. In addition, the covering material 10 is not limited to being used as a covering material for the surface of the vehicle-mounted display, and can be used for any purpose.

[0026] (cover material)

[0027] Figure 2 is a schematic diagram of the covering material of this embodiment, Figure 3 and Figure 4 FIG. 2 is a schematic cross-sectional view of the covering material of this embodiment. Figure 2 As shown, the cover material 10 is a transparent plate-shaped member. It should be noted that the transparency here means that visible light is transmitted. Hereinafter, one main surface of the cover material 10 is referred to as surface 10A, and the main surface on the opposite side of surface 10A is referred to as surface 10B. In addition, the cover material 10 is curved. Figure 2 In the example, the rectangular flat transparent plate is curved. Hereinafter, one side (end face) of the covering material 10 is referred to as the side face 10C1, the side face opposite to the side face 10C1 is referred to as the side face 10C2, the other side face of the covering material 10 is referred to as the side face 10C3, and the side face opposite to the side face 10C3 is referred to as the side face 10C4. Figure 2 In the example, the side surfaces 10C1 and 10C2 are the short sides of the rectangle, and the side surfaces 10C3 and 10C4 are the long sides of the rectangle. It should be noted that the covering material 10 is not limited to a shape obtained by bending a rectangular flat transparent plate. For example, the covering material 10 may be a shape obtained by bending a polygonal, circular or elliptical flat covering material. The degree of bending of the covering material 10 will be described later.

[0028] In the present embodiment, the covering material 10 is installed on the vehicle-mounted display 2 in such a manner that the surface 10A is the outer side of the vehicle-mounted display 2 (the side exposed to the outside) and the surface 10B is the inner side of the vehicle-mounted display 2 (the side not exposed to the outside). In addition, the covering material 10 is installed on the vehicle-mounted display 2 in such a manner that the side 10C3 is the upper side in the vertical direction and the side 10C4 is the lower side in the vertical direction. That is, the covering material 10 is installed on the vehicle-mounted display 2 in such a manner that the horizontal direction is longer than the vertical direction. However, the installation method of the covering material 10 is not limited to this. For example, the covering material 10 may also be installed in such a manner that the surface 10B is the surface side of the vehicle-mounted display 2 and the surface 10A is the inner side of the vehicle-mounted display 2. In addition, for example, the covering material 10 may also be installed on the vehicle-mounted display 2 in such a manner that the side 10C1 is the upper side in the vertical direction and the side 10C2 is the lower side in the vertical direction.

[0029] The following description is based on the case where the covering material 10 is a rectangular member bent, but when the covering material 10 has a non-rectangular shape, the width W0, the width W0 direction, the height L0, and the height L0 direction of the covering material 10 described later are determined based on the smallest rectangle circumscribed by the covering material 10 when viewed from the maximum projection direction. The maximum projection direction refers to the projection direction when the projection area of ​​the covering material 10 projected onto the two-dimensional plane is the largest when the covering material 10 is projected onto the two-dimensional plane. In addition, the smallest rectangle circumscribed by the covering material 10 refers to the rectangle with the smallest area among the rectangles in which at least one side circumscribes the covering material 10 projected onto the two-dimensional plane in the maximum projection direction and the sides are not located radially inward relative to the outer periphery of the projected covering material 10.

[0030] (Width of covering material)

[0031] The width W0 of the covering material 10 is preferably 300 mm to 1500 mm, more preferably 400 mm to 1200 mm, and further preferably 500 mm to 1000 mm. The width W0 refers to the straight-line distance between two points at both ends of the long side of the rectangular covering material 10 (it should be noted that when the lengths of all sides are equal, it can be any side). When the covering material 10 is not a rectangle, the width W0 is the straight-line distance between two points at both ends of the long side of the smallest rectangle circumscribed to the covering material 10 when observed from the maximum projection direction. In the present embodiment, since the covering material 10 is a shape formed by bending a rectangle, the width W0 refers to the straight-line length from the side 10C1 of the covering material 10 to the side 10C2 opposite to the side 10C1. The covering material 10 with a width W0 in this range can appropriately increase rigidity by bending in the manner described below. It should be noted that, hereinafter, the direction along the width W0 will be recorded as the width W0 direction.

[0032] (Height of covering material)

[0033] The height L0 of the covering material 10 is preferably 50 mm to 500 mm, more preferably 100 mm to 400 mm, and further preferably 150 mm to 300 mm. The height L0 refers to the length of the covering material 10 in the direction perpendicular to the width W0 direction, and can also be said to refer to the straight-line distance between two points at both ends of the short side of the rectangle in the covering material 10 in the direction perpendicular to the W0 direction. In the present embodiment, since the covering material 10 is a rectangular bent shape, the height L0 refers to the straight-line length from the side 10C3 of the covering material 10 to the side 10C4 opposite to the side 10C3. The covering material 10 with a height L0 in this range can appropriately increase rigidity by bending in the first direction X and the second direction Y as described later. It should be noted that, hereinafter, the direction along the height L0 will be recorded as the height L0 direction.

[0034] It should be noted that in this embodiment, the height L0 is shorter than the width W0. That is, in this embodiment, it can be said that the covering material 10 is longer in the width W0 direction than in the height L0 direction. However, the height L0 is not limited to being shorter than the width W0, and for example, it can be the same length as the width W0.

[0035] (Surface area of ​​covering material)

[0036] The surface area of ​​the covering material 10 is preferably 15000 mm 2 ~750000mm 2 , preferably 40000mm 2 ~480000mm 2 , further preferably 75000mm 2 ~300000mm 2 The surface area of ​​the covering material 10 here refers to the area of ​​the surface (main surface) of the covering material 10, which may be the area of ​​the surface 10A or the area of ​​the surface 10B. The covering material 10 having a surface area within this range can be appropriately increased in rigidity by bending in the first direction X and the second direction Y as described later.

[0037] (Thickness of covering material)

[0038] The thickness D of the covering material 10 (see Figure 3 ) is preferably 0.5 mm to 3.0 mm, more preferably 0.8 mm to 2.0 mm, and further preferably 1.0 mm to 1.5 mm. The thickness D of the covering material 10 refers to the length from the surface 10A to the surface 10B. The covering material 10 having a thickness D in this range can be appropriately increased in rigidity by bending in the first direction X and the second direction Y as described later.

[0039] (Bending of covering material)

[0040] The covering material 10 forms a bend in the first direction X and a bend in the second direction Y. That is, it can be said that the covering material 10 is bent in the first direction X and the second direction Y. The first direction X is a direction along the height L0 direction in the present embodiment, but is not limited to this and can be any direction. In addition, with respect to the second direction Y, in the present embodiment, the second direction Y is a direction orthogonal to the first direction X and a direction along the width W0 direction, but is not limited to this and can be any direction intersecting the first direction X. For example, the second direction Y is preferably inclined at 10 to 170 degrees relative to the first direction X, more preferably at 45 to 135 degrees, and further preferably at 70 to 100 degrees.

[0041] (Bending in the first direction)

[0042] Figure 3 The cross section S1 of the covering material 10 along the first direction X is shown. The cross section S1 refers to a cross section along the first direction X and the normal direction F1 of an arbitrary point on the surface of the covering material 10. The curvature of the covering material 10 in the first direction X refers to the curvature when the covering material 10 is observed from the cross section S1 along the first direction X. In other words, the curvature of the covering material 10 in the first direction X refers to the curvature of the curve C1 formed by the intersection of the cross section S1 and the surface 10A relative to the first direction X.

[0043] In the present embodiment, the cover material 10 is curved in the first direction X in such a manner that the concave surface formed by the curvature in the first direction X becomes the surface 10A side, and the convex surface formed by the curvature in the first direction X becomes the surface 10B side. That is, the curve C1 becomes a curve convex to the surface 10B side. However, this is not limited to this, and for example, the curve in the first direction X may be formed in such a manner that the concave surface formed by the curvature in the first direction X becomes the surface 10B side, and the convex surface formed by the curvature in the first direction X becomes the surface 10A side.

[0044] The radius of curvature of the bend in the first direction X of the covering material 10 is 60 mm to 300 mm. The radius of curvature of the bend in the first direction X of the covering material 10 can also be referred to as the radius of curvature of the curve C1. The radius of curvature of the bend in the first direction X of the covering material 10 is preferably 100 mm to 250 mm, and more preferably 150 mm to 220 mm. By having the radius of curvature of the bend in the first direction X of the covering material 10 within this range, the design and rigidity of the covering material 10 can be achieved. It should be noted that the radius of curvature of the bend in the first direction X of the covering material 10 is preferably constant at any position, that is, at any point on the surface of the covering material 10. However, the covering material 10 may also have a portion where the radius of curvature of the bend in the first direction X is different depending on the position. Furthermore, it may also have a radius of curvature that is not partially within the above-mentioned range.

[0045] In addition, if Figure 2 As shown in FIG. 1 , in this embodiment, the cover material 10 is curved in the first direction X from the side surface 10C4 to the side surface 10C3. That is, in this embodiment, the cover material 10 is curved in the first direction X over the entire area of ​​the surfaces 10A and 10B. However, this is not limited to this, and for example, as described later, Figure 8 As shown, the curvature in the first direction X is formed only in a part of the surface 10A, 10B.

[0046] Here, if Figure 2As shown, the inflection point on the surface 10A of the bend of the first direction X of the covering material 10 is set as the inflection point P1. That is, the inflection point P1 can be called the inflection point of the curve C1. Since the inflection point P1 is a point on the curve C1 where the section S1 and the surface 10A intersect, it exists in each section S1, that is, it exists at each location in the direction orthogonal to the first direction X. The line connecting these inflection points P1 is set as the line segment E1, and the straight line formed by projecting the line segment E1 on the plane along the width W0 direction is set as the straight line E1a. In this case, in the present embodiment, the straight line E1a is along the width W0 direction of the covering material 10. However, the straight line E1a is not limited to the width W0 direction of the covering material 10, and can also be inclined relative to the width W0 direction. The straight line E1a is preferably inclined by -20 degrees to 20 degrees relative to the width W0 direction of the covering material 10, more preferably inclined by -10 degrees to 10 degrees, and further preferably inclined by -5 degrees to 5 degrees. By setting the inclination of the straight line E1a within this range, the advancing direction of the bend in the first direction X (the direction along the line segment E1) is suppressed from greatly deviating from the width W0 direction of the covering material 10, and the rigidity can be appropriately improved.

[0047] In addition, if Figure 2 As shown, the midpoint of the line segment E1 is set as the midpoint P1A. In this case, the length L in the height L0 direction from the end (here, the side surface 10C4) of the covering material 10 to the midpoint P1A is preferably 20% to 80% of the height L0 of the covering material 10, more preferably 40% to 60%, and further preferably 45% to 55%. By making the ratio of the length L to the height L0 within this range, the position of the bend in the first direction X is suppressed from being too far away from the center of the covering material 10, and the rigidity can be appropriately improved.

[0048] (Bending in the second direction)

[0049] Figure 4 The cross section S2 of the covering material 10 along the second direction Y is shown. More specifically, it refers to a cross section along the second direction Y and the normal direction F2 of an arbitrary point on the surface of the covering material 10. The curvature of the covering material 10 in the second direction Y refers to the curvature when the covering material 10 is observed from the cross section S2 along the second direction Y. The cross section S2, in other words, the curvature of the covering material 10 in the second direction Y refers to the curvature of the curve C2 formed by the intersection of the cross section S2 and the surface 10A relative to the second direction Y.

[0050] In the present embodiment, the cover material 10 is curved in the second direction Y in such a manner that the concave surface formed by the curvature in the second direction Y becomes the surface 10A side, and the convex surface formed by the curvature in the second direction Y becomes the surface 10B side. That is, the curve C2 becomes a curve convex to the surface 10B side. However, this is not limited to this, and for example, the curvature in the second direction Y may be formed in such a manner that the concave surface formed by the curvature in the second direction Y becomes the surface 10B side, and the convex surface formed by the curvature in the second direction Y becomes the surface 10A side.

[0051] The radius of curvature of the bend in the second direction Y of the covering material 10 is 1000 mm to 14000 mm. The radius of curvature of the bend in the second direction Y of the covering material 10 may also be referred to as the radius of curvature of the curve C2. The radius of curvature of the bend in the second direction Y of the covering material 10 is preferably 1500 mm to 8000 mm, and more preferably 2000 mm to 6000 mm. By making the radius of curvature of the bend in the second direction Y of the covering material 10 within this range, the design and rigidity of the covering material 10 can be achieved. It should be noted that the radius of curvature of the bend in the second direction Y of the covering material 10 is preferably constant at any position, that is, at any point on the surface of the covering material 10. However, the radius of curvature of the bend in the second direction Y of the covering material 10 may also vary depending on the position.

[0052] In addition, if Figure 2 As shown in FIG. 1 , in this embodiment, the cover material 10 is curved in the second direction Y from the side surface 10C1 to the side surface 10C2. That is, in this embodiment, the cover material 10 is curved in the second direction Y over the entire area of ​​the surfaces 10A and 10B. However, this is not limited to this. For example, as described later, Figure 7 As shown, the curvature in the second direction Y is formed only in a part of the surface 10A, 10B.

[0053] Here, if Figure 2As shown, the inflection point on the surface 10A of the bend of the second direction Y of the covering material 10 is set as the inflection point P2. That is, the inflection point P2 can be called the inflection point of the curve C2. Since the inflection point P2 is a point on the curve C2 where the section S2 intersects the surface 10A, it exists in each section S2, that is, it exists at every place in the direction orthogonal to the second direction Y. The line connecting these inflection points P2 is set as the line segment E2, and the straight line formed by projecting the line segment E2 on the plane along the height L0 direction is set as the straight line E2a. In this case, in the present embodiment, the straight line E2a is along the height L0 direction of the covering material 10. However, the straight line E2a is not limited to the height L0 direction along the covering material 10, and can also be inclined relative to the height L0 direction. The straight line E2a is preferably inclined by -20 degrees to 20 degrees relative to the height L0 direction of the covering material 10, more preferably inclined by -10 degrees to 10 degrees, and further preferably inclined by -5 degrees to 5 degrees. By setting the inclination of the straight line E2a within this range, the advancing direction of the bend in the second direction Y (the direction along the line segment E2) is suppressed from greatly deviating from the height L0 direction of the covering material 10, and the rigidity can be appropriately improved.

[0054] In addition, if Figure 2 As shown, the midpoint of the line segment E2 is set as the midpoint P2A. In this case, the length W in the width W0 direction from the end (here, the side surface 10C1) of the covering material 10 to the midpoint P2A is preferably 20% to 80% of the width W0 of the covering material 10, more preferably 40% to 60%, and further preferably 45% to 55%. By making the ratio of the length W to the width W0 within this range, the position of the bend in the second direction Y is suppressed from being too far away from the center of the covering material 10, and the rigidity can be appropriately improved.

[0055] (Relationship between the curvature in the first direction and the curvature in the second direction)

[0056] As described above, the covering material 10 forms a curve in the first direction X and a curve in the second direction Y, and the entire area of ​​the surfaces 10A and 10B becomes a continuous curved surface. That is, it can be said that the surfaces 10A and 10B of the covering material 10 preferably do not include a discontinuous surface. In addition, the curve in the first direction X and the curve in the second direction Y of the covering material 10 intersect within the surface of the covering material 10. In other words, it can be said that the covering material 10 includes an area that is curved in the first direction X and the second direction Y, and it can also be said that the line segment E1 and the line segment E2 intersect on the surface 10A.

[0057] It should be noted that the bend in the first direction and the bend in the second direction at least partially meet the following conditions and intersect, and the condition is that the curvature radius of the bend in the first direction is 60 mm to 300 mm, and the curvature radius of the bend in the second direction is 1000 mm to 14000 mm.

[0058] In the present embodiment, for the covering material 10, both the concave surface formed by bending in the first direction X and the concave surface formed by bending in the second direction Y are located on the surface 10A side, and both the convex surface formed by bending in the first direction X and the convex surface formed by bending in the second direction Y are located on the surface 10B side. That is, for the covering material 10, the surface that becomes the concave surface due to bending in the first direction X and the surface that becomes the concave surface due to bending in the second direction Y are the same. However, this is not limited to this, and for example, as described later, Figure 6 As shown in FIG. 1 , the surface that is concave due to the curvature in the first direction X and the surface that is concave due to the curvature in the second direction Y are surfaces on opposite sides to each other.

[0059] In addition, the radius of curvature of the bend in the first direction X of the covering material 10 is smaller than the radius of curvature of the bend in the second direction Y, and the covering material 10 is bent to a greater extent in the first direction X relative to the second direction Y. That is, in the present embodiment, it can also be said that the bend in the height L0 direction as the short axis direction (the bend in the first direction) is greater than the bend in the width W0 direction as the long axis direction (the bend in the second direction). It should be noted that the radius of curvature of the bend in the first direction X is preferably 0.00214 to 0.075 relative to the radius of curvature of the bend in the second direction Y, more preferably 0.0313 to 0.067, and further preferably 0.0367 to 0.06. By making the ratio of the radius of curvature within this range, the design and rigidity of the covering material 10 can be achieved.

[0060] (Material of covering material)

[0061] As the cover material 10 , a known material can be used from transparent and rigid materials, and a resin material such as polycarbonate and polyacrylic acid can be used, or an inorganic material represented by glass can be used.

[0062] In addition, glass having high rigidity and a high-grade feel is preferred.

[0063] As the glass used for the cover material 10, for example, alkali-free glass, soda-lime glass, soda-lime silicate glass, aluminosilicate glass, borosilicate glass, lithium aluminosilicate glass, borosilicate glass, etc. can be used. In addition, as the cover material 10, aluminosilicate glass and lithium aluminosilicate glass are preferred, which can easily introduce large stress by strengthening treatment even if the thickness is thin and can obtain high-strength glass even if it is thin. It should be noted that the chemical strengthening treatment is generally performed by immersing the glass in a molten salt containing an alkali metal.

[0064] (Composition of glass)

[0065] When glass is used as the covering material 10, it is preferred that the following compounds are contained in terms of molar % based on oxides. By making the covering material 10 have the following composition, it is possible to appropriately ensure rigidity even when the covering material 10 is bent. Glass containing 50 to 80% SiO2, 0.1 to 25% Al2O3, 3 to 30% Li2O+Na2O+K2O, 0 to 25% MgO, 0 to 25% CaO and 0 to 5% ZrO2 can be cited, but it is not particularly limited. It should be noted that the 50% to 80% here refers to 50% to 80% when the molar % of the total amount of the covering material 10 is set to 100%, and the same applies to other numerical ranges. In addition, Li2O+Na2O+K2O refers to the total content of Li2O, Na2O and K2O.

[0066] More specifically, as a more preferable composition of the glass for the cover material 10, the following glass compositions can be cited. It should be noted that, for example, "containing 0 to 25% of MgO" means that MgO is not essential but can be contained at 25% or less. The glass of (i) is contained in soda-lime silicate glass, the glasses of (ii) and (iii) are contained in aluminosilicate glass, and the glasses of (iv) and (v) are contained in lithium aluminosilicate glass.

[0067] (i) Glass: The composition expressed in mol% contains 63-73% SiO2, 0.1-5.2% Al2O3, 10-16% Na2O, 0-1.5% K2O, 0-5.0% Li2O, 5-13% MgO and 4-10% CaO

[0068] (ii) Glass: A composition expressed in mol% containing 50 to 74% SiO2, 1 to 10% Al2O3, 6 to 14% Na2O, 3 to 11% K2O, 0 to 5.0% Li2O, 2 to 15% MgO, 0 to 6% CaO and 0 to 5% ZrO2, wherein the total content of SiO2 and Al2O3 is less than 75%, the total content of Na2O and K2O is 12 to 25%, and the total content of MgO and CaO is 7 to 15%

[0069] (iii) Glass: The composition expressed in mol% contains 68-80% SiO2, 4-10% Al2O3, 5-15% Na2O, 0-1% K2O, 0-5.0% Li2O, 4-15% MgO and 0-1% ZrO2

[0070] (iv) Glass: The composition expressed in mol% contains 67-75% SiO2, 0-4% Al2O3, 7-15% Na2O, 1-9% K2O, 0-5.0% Li2O, 6-14% MgO and 0-1.5% ZrO2, the total content of SiO2 and Al2O3 is 71-75%, the total content of Na2O and K2O is 12-20%, and the content of CaO, when contained, is less than 1%

[0071] (v) Glass: The composition expressed in mol% contains 56-73% SiO2, 10-24% Al2O3, 0-6% B2O3, 0-6% P2O5, 2-7% Li2O, 3-11% Na2O, 0-5% K2O, 0-8% MgO, 0-2% CaO, 0-5% SrO, 0-5% BaO, 0-5% ZnO, 0-2% TiO2, 0-4% ZrO2

[0072] (Functional Film)

[0073] Figure 5 Figure 1 is a cross-sectional diagram of the covering material and the functional membrane. Figure 5 As shown, the covering material 10 can form a functional film 12 on the surface. Figure 5 In the example of , a functional film 12 is formed on the surface 10A of the covering material 10. As the functional film 12, for example, an anti-glare film, an anti-reflection film, an anti-fouling film, an antibacterial film, etc. can be cited. That is, the covering material 10 is formed with at least one of the anti-glare film, the anti-reflection film, the anti-fouling film, and the antibacterial film as the functional film 12. In other words, the covering material 10 can be laminated with all of the anti-glare film, the anti-reflection film, the anti-fouling film, and the antibacterial film as the functional film 12, or a part of the anti-glare film, the anti-reflection film, the anti-fouling film, and the antibacterial film can be laminated as the functional film 12. By forming the functional film 12 on the covering material 10, it can function appropriately as a vehicle-mounted display.

[0074] (Another example of the shape of the covering material)

[0075] The covering material 10 is not limited to Figure 2 Hereinafter, another example of the shape of the covering material 10 will be described. Figure 6 to Figure 10 This is a schematic diagram showing another example of the shape of the covering material of this embodiment. It should be noted that the features described in each embodiment can be combined and implemented appropriately.

[0076] For example, you can Figure 6As shown, the cover material 10 forms a convex surface curved in the first direction X on the surface 10A side, and forms a convex surface curved in the second direction Y on the surface 10B side. That is, for the cover material 10, the surface that becomes a concave surface due to the curvature in the first direction X and the surface that becomes a concave surface due to the curvature in the second direction Y can be surfaces on the opposite sides to each other. In this way, by making the surfaces that become concave surfaces curved in the first direction X and the surfaces that become concave surfaces curved in the second direction Y in opposite directions, the rigidity of the cover material 10 can be appropriately improved.

[0077] In addition, for example, Figure 7 As shown in FIG. 1 , the cover material 10 may not be curved in the second direction Y over the entire area of ​​the surfaces 10A and 10B, but may be curved in the second direction Y only in a partial area AR1 of the surfaces 10A and 10B. Figure 7 In the example, the covering material 10 is curved in both the first direction X and the second direction Y in the region AR1 , and is not curved in the second direction Y but is curved in the first direction X in the region AR2 other than the region AR1 .

[0078] In addition, for example, Figure 8 As shown in FIG. 1 , the cover material 10 may not be curved in the first direction X over the entire area of ​​the surfaces 10A and 10B, but may be curved in the first direction X only in a partial area AR1a of the surfaces 10A and 10B. Figure 8 In the example, the covering material 10 is curved in both the first direction X and the second direction Y in the region AR1a, and is not curved in the first direction X but is curved only in the second direction Y in the region AR2a outside the region AR1a.

[0079] As described above, the covering material 10 may form both the bend in the first direction X and the bend in the second direction Y in at least a portion of the region. In this case, the covering material 10 preferably forms at least one of the bend in the first direction X and the bend in the second direction Y in a region where the bend in the first direction X and the bend in the second direction Y are not formed. That is, the covering material 10 preferably does not include a planar region in which no bend is formed in the surfaces 10A and 10B, and the entire region of the surfaces 10A and 10B is a curved surface. However, the covering material 10 may include a planar region in which neither the bend in the first direction X nor the bend in the second direction Y is formed in a portion of the regions of the surfaces 10A and 10B.

[0080] In addition, for example, Fig. 9 As shown in FIG. 1 , the curvature in the first direction X of the covering material 10 may be a curvature having a plurality of inflection points in the first direction X. Figure 2 Although the curve C1 which is curved in the first direction has only one inflection point, it can also be Fig. 9 As shown, there are multiple inflection points. Fig. 9 In the example, curve C1 is a curve formed by connecting a convex curve on the surface 10A side and a convex curve on the surface 10B side in a continuous manner, and has inflection points on the surface 10A side and the surface 10B side. However, the number of inflection points is not limited to 2, and may be 3 or more.

[0081] In addition, for example, Fig.10 As shown in FIG. 1 , the curvature in the second direction Y of the covering material 10 may be a curvature having a plurality of inflection points in the second direction Y. Figure 2 Although the curve C2 as the curve in the second direction has only one inflection point, it can also be Fig.10 As shown, there are multiple inflection points. Fig.10 In the example of , curve C2 is a curve formed by connecting a convex curve on the surface 10A side and a convex curve on the surface 10B side in a continuous manner, and has inflection points on the surface 10A side and the surface 10B side. However, the number of inflection points is not limited to 2, and may be 3 or more.

[0082] Fig. 9 and Fig.10 In the embodiment, only one of the bend in the first direction X and the bend in the second direction Y has a plurality of inflection points, but both the bend in the first direction X and the bend in the second direction Y may have a plurality of inflection points. That is, the covering material 10 may have a plurality of inflection points in the first direction X for the bend in the first direction X, and may have a plurality of inflection points in the second direction Y for the bend in the second direction Y.

[0083] (Effect)

[0084] As described above, the covering material 10 of the present embodiment is a shape having a plurality of bends formed with bends in the first direction X and bends in the second direction Y, and the bends in the first direction X and the bends in the second direction Y intersect within the surface of the covering material 10. In addition, the curvature radius of the bend in the first direction X is 60 mm to 300 mm, and the curvature radius of the bend in the second direction Y is 1000 mm to 14000 mm. Here, since the covering material having a bend has a tendency to decrease in rigidity, it is required to suppress the reduction in rigidity. In this regard, the covering material 10 of the present embodiment can suppress the reduction in rigidity by forming a bend in the first direction X with a larger bend and a bend in the second direction Y with a smaller bend intersecting with the bend in the first direction X. In addition, by making the bend in the first direction X and the bend in the second direction Y within the above-mentioned numerical range, the rigidity can be appropriately improved, and the design can be suppressed from being damaged due to the large bends of both, so that both rigidity and design can be achieved. Furthermore, the amount of shape change when stress is applied can be reduced by setting the bend in the first direction X and the bend in the second direction Y within the above numerical ranges. In addition, the cover material 10 of this embodiment is suitable for use as a vehicle-mounted display by having such a shape.

[0085] Example

[0086] Next, the examples are described. It should be noted that the embodiments may be changed as long as the effect of the invention is achieved. In the examples, various samples obtained by changing the degree of bending of a flat glass plate are evaluated by simulation. As the flat glass plate, Dragontrail (registered trademark) manufactured by AGC with a longitudinal length of 50 mm to 300 mm, a lateral length of 1000 mm, and a thickness of 1.1 mm is used.

[0087] (Evaluation of Rigidity)

[0088] As an evaluation of the examples, the rigidity was evaluated by calculating the cross-sectional inertia moments in two directions, namely, a direction parallel to the bend with the smallest curvature radius and a direction perpendicular to the bend with the smallest curvature radius, through simulation. Fig.11 and Fig.12 This is a schematic diagram for explaining the rigidity evaluation. Fig.11 and Fig.12 Detailed Description of the Invention A method for evaluating the rigidity when the covering material 10 of the present embodiment is used is shown.

[0089] like Fig.11As shown, an arbitrary plane determined by the parallel direction d1 of the curve with the smallest curvature radius and the normal direction FA of the surface of the covering material 10 at an arbitrary point A in the surface of the covering material 10 is set as a plane PL1. It should be noted that in this embodiment, since the curvature radius of the curve in the first direction X is the smallest, the first direction X becomes the parallel direction d1. In addition, the plane PL1 can be called a plane along the parallel direction d1 and the normal direction FA.

[0090] Then, when the cross section of the covering material 10 cut by the plane PL1 is referred to as the cross section SL1, the cross section SL1 having the largest cross section moment of inertia among the cross sections SL1 is found by simulation. MAX , and define this maximum moment of inertia as the main section moment of inertia M1.

[0091] In addition, if Fig.12 As shown, an arbitrary plane determined by the vertical direction d2 orthogonal to the parallel direction d1 and the normal direction FA of the surface of the covering material 10 at an arbitrary point A in the surface of the covering material 10 is set as a plane PL2. It should be noted that in this embodiment, the second direction Y is the vertical direction d2. In addition, the plane PL2 can be called a plane along the vertical direction d2 and the normal direction FA.

[0092] Then, when the cross section of the covering material 10 cut by the plane PL2 is referred to as the cross section SL2, the cross section SL2 having the largest cross section moment of inertia among the cross sections SL2 is found by simulation. MAX , and define this maximum moment of inertia as the secondary section moment of inertia M2.

[0093] In addition, when calculating the moment of inertia of the area, Solid Works manufactured by Dassault was used as a measuring device (software).

[0094] (Evaluation of shape change when surface pressure is applied)

[0095] As an evaluation of the examples, the shape change when a surface pressure was applied was evaluated. Fig.13 and Fig.14 This is a schematic diagram for explaining the evaluation of the shape change when the surface pressure is applied. Fig.13 and Fig.14 In FIG. 1 , a method for evaluating the shape change when a surface pressure is applied when the covering material 10 of this embodiment is used is shown. Fig.13 As shown, the direction perpendicular to the imaginary plane parallel to the parallel direction d1 and the vertical direction d2 is set as direction d3. In this evaluation, the outer periphery of the cover material as a sample is constrained in direction d3, and the maximum deformation amount of the glass in the vertical direction when a force of ±0.004 MPa is applied in the direction perpendicular to the surface of the cover material is calculated by simulation.

[0096] Then, divide the calculated maximum deformation of the glass in the direction perpendicular to the surface by the representative length L of the covering material. max Then, an evaluation value Z is calculated, and the evaluation value Z is used to evaluate the shape change when the surface pressure is applied.

[0097] like Fig.14 As shown, the representative length L of the covering material max It refers to the maximum length of the distances between any two points on the edge when the curved covering material is projected onto a two-dimensional plane so that the projected area S becomes the maximum.

[0098] It should be noted that in the calculation of the maximum deformation in the direction perpendicular to the surface of the covering material, the general structural analysis software ABAQUS was used as the measuring device (software), and as the measuring condition, a surface pressure of 0.004 MPa was applied in the direction perpendicular to the surface. In addition, as the material coefficient of Dragon Trail, Young's modulus was used: 7.4×10 10 N / m 2 , Poisson's ratio: 0.22.

[0099] Next, the shape of the sample of each example is described. The shape of the sample of each example is shown in Table 1. It should be noted that the description in the "shape" column and the description in the "concavity and convexity" column of Table 1 have the following meanings.

[0100] Single: A shape that is bent in only one direction

[0101] Complex curve: a shape that bends in at least two directions

[0102] Saddle type: A shape where the first direction of curvature is convex and the second direction of curvature is concave.

[0103] Local: Locally curved in at least one direction, limited to that direction, with the rest of the curve being a straight line

[0104] S-shaped: A shape that is a mixture of convex and concave in at least one direction of curvature

[0105] Twist: A shape where the bend in the second direction is not perpendicular to the bend in the first direction

[0106] Convex: The curved shape that bulges outward when the glass is assembled

[0107] Concave: The curved shape that convexly moves inward when the glass is assembled.

[0108] [Table 1]

[0109]

[0110] (Example 1)

[0111] In Example 1, a flat glass plate sample having a horizontal length (width) of 1000 mm, a vertical length (height) of 200 mm, and a thickness of 1.1 mm was prepared. In Example 1, the flat glass plate sample was curved in a parallel direction d1 and a perpendicular direction d2.

[0112] In the bending in the parallel direction d1, the parallel direction d1 (the direction of the bending with the smallest curvature radius) is set as the longitudinal direction of the glass plate, the position of the bending in the parallel direction d1 is set as 1 / 2L, the convex surface formed by the bending in the parallel direction d1 is set as one surface of the glass plate, and the curvature radius R1 of the bending in the parallel direction d1 is set as 200 mm. 1 / 2L means that the inflection point of the bending in the parallel direction d1 is located at the center of the longitudinal length of the glass plate, in other words, it means that the ratio of the length L to the height L0 of the glass plate in the case of the glass plate of this embodiment is 50%.

[0113] In the bending in the vertical direction d2, the vertical direction d2 (the bending direction perpendicular to the bending direction with the smallest curvature radius) is set as the lateral direction of the glass plate, the position of the bending in the vertical direction d2 is set as 1 / 2W, the convex surface formed by the bending in the vertical direction d2 is set as one surface of the glass plate, and the curvature radius R2 of the bending in the vertical direction d2 is set to 2000mm. 1 / 2W means that the inflection point of the bending in the vertical direction d2 is located at the center of the length in the lateral direction of the glass plate, in other words, it means that the ratio of the length W to the width W0 of the glass plate when taking the glass plate of this embodiment as an example is 50%.

[0114] (Example 2)

[0115] In Example 2, the sample was prepared in the same manner as in Example 1 except that the concave surface formed by bending in the parallel direction d1 was set as one surface of the glass plate, that is, the concave surface formed by bending in the parallel direction d1 and the concave surface formed by bending in the perpendicular direction d2 were set on the opposite sides. Figure 6 Such a shape.

[0116] (Example 3)

[0117] In Example 3, a sample was prepared in the same manner as in Example 1 except that the curvature radius R1 of the curve in the parallel direction d1 was set to 100 mm.

[0118] (Example 4)

[0119] In Example 4, a sample was prepared in the same manner as in Example 1 except that the curvature radius R1 of the curve in the parallel direction d1 was set to 300 mm.

[0120] (Example 5)

[0121] In Example 5, a sample was prepared in the same manner as in Example 1 except that the curvature radius R2 of the curve in the vertical direction d2 was set to 1000 mm.

[0122] (Example 6)

[0123] In Example 6, a sample was prepared in the same manner as in Example 1 except that the curvature radius R2 of the curve in the vertical direction d2 was set to 10000 mm.

[0124] (Example 7)

[0125] In Example 7, a sample was prepared in the same manner as in Example 1 except that the position of the bend in the parallel direction d1 was set to 3 / 4L.

[0126] (Example 8)

[0127] In Example 8, a sample was prepared in the same manner as in Example 1 except that the position of the bend in the vertical direction d2 was set to 1 / 3W.

[0128] (Example 9)

[0129] In Example 9, the sample was prepared in the same manner as in Example 1 except that the number of inflection points of the bend in the parallel direction d1 was set to two, the position of one inflection point was set to 1 / 3L, and the position of the other inflection point was set to 2 / 3L. The sample of Example 9 was as follows Fig. 9 Such a shape.

[0130] (Example 10)

[0131] In Example 10, the sample was prepared in the same manner as in Example 1 except that the number of inflection points of the bend in the vertical direction d2 was set to two, the position of one inflection point was set to 1 / 3W, and the position of the other inflection point was set to 2 / 3W. Fig.10 Such a shape.

[0132] (Example 11)

[0133] In Example 11, a sample was prepared in the same manner as in Example 1, except that the direction of the bend in the vertical direction d2 was inclined with respect to the lateral direction of the glass plate.

[0134] (Example 12)

[0135] In Example 12, a sample was prepared in the same manner as in Example 1 except that the lateral length of the glass plate was 300 mm and the curvature radius of the curve in the perpendicular direction d2 was 20,000,000 mm to form a substantially single-curved shape only in the parallel direction d1.

[0136] (Example 13)

[0137] In Example 13, the horizontal length of the glass plate was set to 100 mm, the vertical length was set to 1000 mm, and the radius of curvature of the bend in the parallel direction d1 was set to 50 mm. Other than this, samples were prepared in the same manner as in Example 1.

[0138] (Example 14)

[0139] In Example 14, the horizontal length of the glass plate was set to 300 mm, the vertical length was set to 1000 mm, and the radius of curvature of the bend in the parallel direction d1 was set to 500 mm. Other than this, samples were prepared in the same manner as in Example 1.

[0140] (Example 15)

[0141] In Example 15, the horizontal length of the glass plate was set to 300 mm, the vertical length was set to 1000 mm, and the radius of curvature of the bend in the perpendicular direction d2 was set to 500 mm. Other than this, samples were prepared in the same manner as in Example 1.

[0142] (Example 16)

[0143] In Example 16, the horizontal length of the glass plate was set to 300 mm, the vertical length was set to 1000 mm, and the radius of curvature of the bend in the perpendicular direction d2 was set to 15000 mm. Other than this, samples were prepared in the same manner as in Example 1.

[0144] (Evaluation Results)

[0145] For the samples of Examples 1 to 16, the rigidity evaluation and the evaluation of the shape change under the load surface pressure described above were performed.

[0146] In the evaluation of the rigidity of the moment of inertia M1 of the main cross-section,

[0147] 100000 (1 / mm 4 ) ≤ moment of inertia M1 of the main cross-section <1000000> (1 / mm 4 ) was set to "1",

[0148] 10000 (1 / mm 4 ) ≤ moment of inertia M1 of the main cross-section < 100000 (1 / mm 4 ) or 1000000 (1 / mm 4 ) ≤ moment of inertia M1 of the main cross-section <1000000>0 (1 / mm 4 ) was set to "2",

[0149] moment of inertia M1 of the main cross-section < 10000 (1 / mm 4 ) or 10000000 (1 / mm 4 ) ≤ moment of inertia M1 of the main cross-section was set to "NG".

[0150] In the evaluation of the rigidity of the secondary sectional moment of inertia M2,

[0151] when 100,000 (1 / mm 4 ) ≤ secondary sectional moment of inertia M2 < 1,000,000 (1 / mm 4 ), it is set as "1",

[0152] when 10,000 (1 / mm 4 ) ≤ secondary sectional moment of inertia M2 < 100,000 (1 / mm 4 ) or 1,000,000 (1 / mm 4 ) ≤ secondary sectional moment of inertia M2 < 10,000,000 (1 / mm 4 ), it is set as "2",

[0153] when secondary sectional moment of inertia M2 < 10,000 (1 / mm 4 ) or 10,000,000 (1 / mm 4 ) ≤ secondary sectional moment of inertia M2, it is set as "NG".

[0154] In the evaluation of the shape change under the load surface pressure,

[0155] when 0.0004 ≤ evaluation value Z < 0.0008, it is set as "1",

[0156] when 0.0008 ≤ evaluation value Z < 0.00104 or 0.00001 ≤ evaluation value Z < 0.0004, it is set as "2",

[0157] when evaluation value Z < 0.00001 or 0.00104 < evaluation value Z, it is set as "NG".

[0158] When the evaluations of the rigidity of the main sectional moment of inertia M1, the rigidity of the secondary sectional moment of inertia M2, and the shape change under the load surface pressure are all "1" or "2", it is evaluated as qualified; when at least one of them is "NG", it is evaluated as unqualified.

[0159] It can be known that: in Examples 1 to 11 as the embodiments, the evaluations of the rigidity of the main sectional moment of inertia M1, the rigidity of the secondary sectional moment of inertia M2, and the shape change under the load surface pressure are all "1" or "2"; in Comparative Examples 12 to 16, at least one of them is "NG". By setting the main sectional moment of inertia M1 and the secondary sectional moment of inertia M2 as "1" or "2", the rigidity will not become too weak, and the flexibility during assembly can be maintained. Even when there are shape deviations in the glass, it can be properly assembled. In addition, by setting the evaluation of the shape change under the load surface pressure as "1" or "2", excessive deformation of the glass can be suppressed, and excessive clearance during the assembly of the glass plate can be suppressed.

[0160] Table 2 shows the shapes of the samples of Examples 17 to 20.

[0161] [Table 2]

[0162]

[0163] (Example 17~Example 20)

[0164] In Example 17, a sample similar to that of Example 1 was prepared except that the curvature radius R2 of the curve in the vertical direction d2 was set to 1600 mm.

[0165] In Example 18, a sample similar to that of Example 1 was prepared except that the curvature radius R2 of the curve in the vertical direction d2 was set to 7500 mm.

[0166] In Example 19, a sample similar to that of Example 1 was prepared except that the curvature radius R2 of the curve in the vertical direction d2 was set to 1250 mm.

[0167] In Example 20, a sample similar to that of Example 1 was prepared except that the curvature radius R2 of the curve in the vertical direction d2 was set to 8500 mm.

[0168] When comparing Example 17 and Example 19 as embodiments, it can be seen that the evaluation values ​​of the cross-sectional inertia moment in the X direction and the deformation amount under the load surface pressure are improved in Example 17 with a curvature radius R2 of 1600 mm compared with Example 19 with a curvature radius R2 of 1250 mm. In addition, when comparing Example 18 and Example 20 as embodiments, it can be seen that the evaluation value of the deformation amount under the load surface pressure is improved in Example 18 with a curvature radius R2 of 7500 mm in the second direction compared with Example 20 with a curvature radius R2 of 8500 mm.

[0169] From the above, it can be seen that the reduction in rigidity can be more appropriately suppressed by setting the curvature radius R2 to 1500 mm to 8000 mm.

[0170] Above, the embodiments of the present invention have been described, but the embodiments are not limited by the contents of the embodiments. In addition, the above-mentioned constituent elements include constituent elements that can be easily conceived by those skilled in the art, substantially the same constituent elements, and constituent elements of so-called equivalent scopes. Furthermore, the above-mentioned constituent elements can be appropriately combined. In addition, various omissions, replacements or changes of constituent elements can be made within the scope of the gist of the above-mentioned embodiments.

[0171] Explanation of symbols

[0172] 10 Covering Materials

[0173] 10A, 10B surface

[0174] X 1st direction

[0175] Y 2nd direction

Claims

1. A covering material, which is a transparent covering material having a bend in a first direction and a bend in a second direction, The thickness is 0.8mm~2.0mm, the width is 300mm~1500mm, and the height is 50mm~500mm. The bend in the first direction and the bend in the second direction intersect within the surface of the covering material. The curvature radius of the bend in the first direction is 60 mm to 300 mm, The curvature radius of the bend in the second direction is 1500 mm to 8000 mm, The bend in the first direction is a bend having the smallest radius of curvature in the covering material, and the bend in the second direction is a bend intersecting the bend in the first direction.

2. The covering material according to claim 1, wherein The thickness is 0.8mm~2.0mm, and the surface area of ​​one surface is 15000mm 2 ~750000mm 2 .

3. The covering material according to claim 1 or 2, wherein: A convex surface curved in the first direction is formed on one surface side, and a convex surface curved in the second direction is formed on the other surface side.

4. The covering material according to claim 1 or 2, wherein: The covering material is glass and, expressed in molar % based on oxides, contains SiO2: 50% to 80%, Al2O3: 0.1% to 25%, Li2O+Na2O+K2O: 3% to 30%, MgO: 0% to 25%, CaO: 0% to 25%, and ZrO2: 0% to 5%.

5. The covering material according to claim 1 or 2, wherein: At least one of an antiglare film, an antireflection film, an antifouling film, and an antibacterial film is formed on one surface.

6. The covering material according to claim 1 or 2, wherein: The curvature radius of the bend in the first direction is 100 mm to 250 mm.

7. The covering material according to claim 1 or 2, which is provided in a vehicle-mounted display.

8. A display device comprising the cover material according to any one of claims 1 to 7.

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