Glass product and in-vehicle display device

Abstract

The present invention relates to a glass product (10) having a cover glass (12) and a frame (14) bonded to the main surface (12B) side of the cover glass (12) via an adhesive layer (16), the cover glass (12) being provided with a curved portion formed in a shape protruding toward the main surface (12B), the adhesive layer (16) comprising at least one of a first adhesive layer and a second adhesive layer, the thickness, Young's modulus, and circumference of the cover glass, the radius of curvature of the curved portion, and the area of the adhesive layer have a specific relationship.

Description

[0001] This application is a divisional application of the application with application number 202280058832.1, national phase entry date February 28, 2024, and invention name “Glass products and vehicle-mounted display devices”. Technical Field

[0002] The present invention relates to a glass product and a vehicle-mounted display device. Background Art

[0003] In vehicle-mounted display devices that display information required for driving, etc., liquid crystal displays and organic EL displays are sometimes used. In these displays, cover glass is sometimes configured to protect the front surface. In addition, in recent years, automobile interiors require high design and cover glass with a curved surface shape. As one of the methods for bending the cover glass, a cold forming method such as Patent Document 1 is known.

[0004] Patent Document 1: Japanese Patent Application No. 2017-532233

[0005] However, in the case of a cover glass bent by a cold forming method, for example, since the cover glass is fixed to a frame with an adhesive to maintain the curved shape, there is a possibility that the cover glass may be peeled from the frame due to springback. Summary of the invention

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a glass product and a vehicle-mounted display device capable of suppressing separation of a cover glass from a frame.

[0007] In order to solve the above-mentioned problems and achieve the purpose, the glass product involved in the present disclosure comprises: a cover glass having a first main surface and a second main surface; and a frame bonded to the second main surface side of the cover glass via an adhesive layer, and the cover glass is provided with a curved portion formed in a shape convex toward the second main surface, and the adhesive layer includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test. When R' is set to be as shown in the following formula (1) and C1 is set to be as shown in the following formula (2), when C1>0, the curved portion satisfies the following formula (3), and when C1≤0, the curved portion satisfies the following formula (4).

[0008] Here, R in the following formula is the radius of curvature of the curved portion (mm), F is the length of the flat region in the first direction when the cover glass is provided with a flat region adjacent to the first direction orthogonal to the bending axis of the curved portion, t is the thickness of the cover glass (mm), and A1 is the area of ​​the first adhesive layer at the curved portion (mm 2), A2 is the area of ​​the second adhesive layer at the bending portion (mm 2 ), E is the Young's modulus (GPa) of the cover glass, and L refers to the length (mm) of the curved portion in the first direction.

[0009] R′=R+F(5t-0.4) …(1)

[0010] C1=1000 / R′-7.76t 2 +19.5t-12.7+(1-0.90t 0.5 )(A2 / (A1+A2)) …(2)

[0012]

[0013] (A1+A2) / L>2.4…(4)

[0014] In order to solve the above-mentioned problems and achieve the purpose, the glass product involved in the present disclosure comprises: a cover glass having a first main surface and a second main surface; and a frame bonded to the second main surface side of the cover glass via an adhesive layer, and the cover glass is provided with a curved portion formed in a shape convex toward the first main surface, and the adhesive layer includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test. When R' is set to be as shown in the following formula (1) and C2 is set to be as shown in the following formula (5), when C2>0, the curved portion satisfies the following formula (6), and when C2≤0, the curved portion satisfies the following formula (7).

[0015] Here, R in the following formula is the radius of curvature of the curved portion (mm), F is the length of the flat region in the first direction when the cover glass is provided with a flat region adjacent to the first direction orthogonal to the bending axis of the curved portion, t is the thickness of the cover glass (mm), and A1 is the area of ​​the first adhesive layer at the curved portion (mm 2 ), A2 is the area of ​​the second adhesive layer at the bending portion (mm 2 ), E is the Young's modulus (GPa) of the cover glass, and L refers to the length (mm) of the curved portion in the first direction.

[0016] R′=R+F(5t-0.4)…(1)

[0017] C2=1000 / R′-4.54t2+11.37t-7.58+(0.586-0.44t 0.5 )(A2 / (A1+A2))

[0018] …(5)

[0019]

[0020] (A1+A2) / L>2.4…(7)

[0021] In order to solve the above-mentioned problems and achieve the purpose, the vehicle-mounted display device according to the present disclosure includes: a display; and the above-mentioned glass product provided on the surface of the above-mentioned display.

[0022] According to the present invention, it is possible to suppress the cover glass from peeling off from the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram showing the vehicle-mounted display device according to the present embodiment.

[0024] Figure 2 It is a schematic diagram of the glass product involved in this embodiment.

[0025] Figure 3 It is a top view of the cover glass.

[0026] Figure 4 is a cross-sectional view of the cover glass.

[0027] Figure 5 This is an example of a graph for explaining the relationship between the characteristics of the cover glass.

[0028] Figure 6 This is a diagram showing an example of a case where both the first adhesive layer and the second adhesive layer are provided.

[0029] Figure 7 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0030] Figure 8 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0031] Fig. 9 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0032] Fig.10 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0033] Fig.11 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0034] Fig.12 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0035] Fig.13 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0036] Fig.14 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0037] Fig.15 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0038] Fig.16 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0039] Fig.17 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0040] Fig.18 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0041] Fig.19 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0042] Fig. 20 It is a schematic diagram of the cover glass which concerns on another example of this embodiment.

[0043] Fig.21 It is a graph which shows the evaluation results of each cover glass of Example 1 and Example 2.

[0044] Fig. 22 It is a graph which shows the evaluation results of each cover glass of Example 3 and Example 4.

[0045] Fig.23 It is a graph which shows the evaluation results of each cover glass of Example 5 and Example 6.

[0046] Fig.24 It is a graph which shows the evaluation results of each cover glass of Example 7 and Example 8.

[0047] Fig.25 It is a graph which shows the evaluation results of each cover glass of Example 9 and Example 10.

[0048] Fig.26 It is a graph which shows the evaluation results of each cover glass of Example 11 and Example 12.

[0049] Fig. 27 It is a graph which shows the evaluation results of each cover glass of Example 13 and Example 14.

[0050] Fig.28It is a graph showing the evaluation results of each cover glass of Example 15 and Example 16.

[0051] Fig.29 It is a graph showing the evaluation results of each cover glass of Example 17 and Example 18.

[0052] Fig.30 It is a graph showing the evaluation results of each cover glass of Example 19 and Example 20.

[0053] Fig.31 It is a graph showing the evaluation results of each cover glass of Example 21 and Example 22.

[0054] Fig.32 It is a graph showing the evaluation results of each cover glass of Example 23 and Example 24.

[0055] Fig.33 It is a graph showing the evaluation results of each cover glass of Example 25 and Example 26.

[0056] Fig.34 It is a graph showing the evaluation results of each cover glass of Example 27 and Example 28.

[0057] Fig.35 It is a graph showing the evaluation results of each cover glass of Example 29 and Example 30.

[0058] Fig.36 It is a graph showing the evaluation results of each cover glass of Example 31 and Example 32.

[0059] Fig.37 It is a graph showing the evaluation results of each cover glass of Example 33 and Example 34.

[0060] Fig.38 It is a graph showing the evaluation results of each cover glass of Example 35 and Example 36.

[0061] Fig.39 It is a graph showing the evaluation results of each cover glass of Example 37 and Example 38.

[0062] Fig.40 It is a graph showing the evaluation results of each cover glass of Example 39 and Example 40.

[0063] Fig.41 It is a graph showing the evaluation results of each cover glass of Example 41 and Example 42.

[0064] Fig.42 It is a graph showing the evaluation results of each cover glass of Example 43 and Example 44. DETAILED DESCRIPTION

[0065] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to the embodiment, and in the case of multiple embodiments, an embodiment composed of a combination of the embodiments is also included. In addition, regarding numerical values, the range of rounding is included.

[0066] (In-vehicle display device)

[0067] Figure 1 Schematic diagram showing a vehicle-mounted display device according to the present embodiment. Figure 1 As shown, the glass product 10 according to the present embodiment is provided in a vehicle-mounted display device 2 and is used as a cover member of the surface (front surface) of a display 3 that displays an image.

[0068] The vehicle-mounted display device 2 is a display device installed in the vehicle, for example, installed in front of the steering shaft 1 in the vehicle. The display 3 displays, for example, a car navigation screen, various instruments such as a speedometer, and a start button. Figure 1 The structure of is an example, and the vehicle-mounted display device 2 using the glass product 10 may have any structure. In addition, the glass product 10 is not limited to being used as a cover member on the surface of the vehicle-mounted display device 2, and can be used for any purpose.

[0069] (Glass products)

[0070] Figure 2 Schematic diagram of the glass product according to the present embodiment. Figure 2 As shown, the glass product 10 includes a cover glass 12, a frame 14, and an adhesive layer 16. The cover glass 12 is a transparent plate-shaped glass component, and has a main surface 12A (first main surface) as one main surface, and a main surface 12B (second main surface) as a main surface on the opposite side to the main surface 12A. When the glass product 10 is mounted on a mounted object such as a vehicle-mounted display device 2, the main surface 12A of the cover glass 12 becomes the side exposed to the outside, and the main surface 12B becomes the side facing the mounted object (here, the display 3). In addition, transparency here means the transmission of visible light.

[0071] The frame 14 is a frame-shaped member attached to the main surface 12B of the cover glass 12. The frame 14 is made of, for example, resin or metal, but is not limited thereto and may be formed of any material. As described later, since the cover glass 12 is curved in the X direction (first direction), the frame 14 is also curved in the X direction along the cover glass 12. The frame 14 is attached to the peripheral edge of the main surface 12B of the cover glass 12.

[0072] exist Figure 2In the example of FIG. 1 , the frame 14 is provided over the entire section in the circumferential direction of the peripheral edge portion of the main surface 12B of the cover glass 12, but the present invention is not limited thereto and the frame 14 may be interrupted in a part of the section. Figure 2 In the example, the end portion of the cover glass 12 on the peripheral side does not protrude from the frame 14 , but the present invention is not limited thereto, and the end portion of the cover glass 12 on the peripheral side may protrude from the frame 14 .

[0073] exist Figure 2 In the example, the frame 14 is a frame-shaped frame provided at the periphery of the cover glass 12 and having an inner opening, but the frame 14 may also be a box-shaped frame without an opening. Figure 2 The Z-direction side of the frame 14 in the embodiment includes a plate-like member that covers the opening. As described above, the shape of the frame 14 and the mounting position on the main surface 12B are not limited to those described above, and may be arbitrary.

[0074] The frame 14 is fixed (bonded) to the main surface 12B of the cover glass 12 via the adhesive layer 16. That is, the adhesive layer 16 is provided between the frame 14 and the main surface 12B of the cover glass 12, and bonds the surface of the frame 14 on the cover glass 12 side to the main surface 12B of the cover glass 12. The adhesive layer 16 can be composed of any adhesive member capable of bonding the frame 14 and the cover glass 12, such as a double-sided tape or an adhesive.

[0075] The glass product 10 includes at least one of a first adhesive layer and a second adhesive layer as an adhesive layer 16. The first adhesive layer refers to an adhesive layer whose elastic modulus is 5MPa or more in the press-in elastic modulus test, and the second adhesive layer refers to an adhesive layer whose elastic modulus is less than 5MPa in the press-in elastic modulus test. That is, the press-in elastic modulus of the first adhesive layer is higher than the press-in elastic modulus of the second adhesive layer. The first adhesive layer preferably has an elastic modulus of less than 100MPa in the press-in elastic modulus test, and more preferably less than 30MPa. Here, the elastic modulus of the first adhesive layer in the press-in elastic modulus test is preferably 5MPa or more and less than 100MPa, and more preferably 5MPa or more and less than 30MPa. The second adhesive layer preferably has an elastic modulus of 0.2MPa or more in the press-in elastic modulus test, and more preferably 0.5MPa or more. Here, the elastic modulus of the second adhesive layer in the press-in elastic modulus test is preferably 0.2MPa or more and less than 5MPa, and more preferably 0.5MPa or more and less than 5MPa.

[0076] The first adhesive layer and the second adhesive layer are composed of different adhesive components. It can be said that the adhesive strength of the adhesive component constituting the first adhesive layer is higher than the adhesive strength of the adhesive component constituting the second adhesive layer. In addition, the adhesive layer 16 can also be composed of three or more adhesive components.

[0077] In addition, the indentation elastic modulus test in the present embodiment was performed in the following manner.

[0078] The adhesive layer 16 bonded to the main surface 12B of the cover glass 12 and the frame 14 is exposed upward in the vertical direction and arranged in a creep tester (for example, manufactured by Yaden Co., Ltd., model RE2-33005C). A push rod (for example, a cylindrical push rod manufactured by Yaden Co., Ltd., model P-61, φ1.5, H40) is pressed into the adhesive layer 16 at a speed of 0.05 mm / second at room temperature, for example, 20°C and a relative humidity of 50%, until the pressing depth becomes 5% to 10% of the thickness of the adhesive layer 16.

[0079] The method for exposing the adhesive layer is not particularly limited, but a method in which the adhesive is not denatured is preferred. For example, a method in which a metal sheet is inserted between the first adhesive layer and the cover glass 12 or frame 14 as an adherend to perform physical peeling can be cited. When the adhesive layer is broken in the middle of the thickness direction during peeling, it is preferred to measure the elastic modulus on the side that remains thicker.

[0080] In addition, it is also preferred to measure the elastic modulus using the adhesive layer remaining on the side with a higher Young's modulus between the frame 14 and the cover glass 12. That is, when the frame is made of metal, it is preferred to measure the elastic modulus by leaving the adhesive layer on the frame side, and when the frame is made of resin with a low Young's modulus, it is preferred to measure the elastic modulus by leaving the adhesive layer on the cover glass side.

[0081] Next, the load acting on the push rod during the press-in and the displacement in the press-in direction of the push rod are measured in sequence, and the load and displacement are plotted at intervals, and the slope of the approximate line of each point plotted is calculated to be used as the elastic modulus of the adhesive layer 16. The press-in elastic modulus test is performed at each position of the adhesive layer 16, and the area where the elastic modulus becomes more than 5MPa is used as the first adhesive layer, and the area where the elastic modulus is less than 5MPa is used as the second adhesive layer. In addition, it is preferred to draw every 0.04 seconds, and perform the press-in elastic modulus test twice at the same position. The position where the elastic modulus becomes more than 5MPa in the two measurements twice can be used as the first adhesive layer, and the position where the elastic modulus is less than 5MPa in the two measurements twice can be used as the second adhesive layer.

[0082] Here, the significance of the indentation elastic modulus test in the present invention is explained. In glass products, an adhesive bonds a glass surface or a printed surface on a glass surface to a metal or resin frame. The material of the adhesive is designed so that when an attempt is made to peel off the bonded glass surface from the adherend, the adhesive is usually broken to peel off. Moreover, it is known that the bonding strength when the adhesive breaks depends on the tensile elastic modulus of the adhesive. However, the cross-type bonding strength test, the H-type bonding strength test method, etc., which are known as existing bonding strength tests, are difficult to measure in glass products in which the cover glass and the frame are already bonded. In the present invention, as an evaluation method to replace the existing bonding strength test, an indentation elastic modulus test that can also be verified from a glass product in which the cover glass and the frame are already bonded is adopted. In the present invention, since it is known that the adhesive breaks when the glass product is peeled off from the frame, and that the tensile elastic modulus and the indentation elastic modulus are usually positively correlated, it can be inferred that there is also a correlation between the bonding strength and the elastic modulus in the indentation test.

[0083] (Cover glass)

[0084] The cover glass 12 is bent and mounted on the frame 14. In the present embodiment, the cover glass 12 is bent by a cold forming method and mounted on the frame 14. That is, the cover glass 12 is mounted on the frame 14 in a state where bending stress acts. The cover glass 12 is described in more detail below. In addition, cold forming here refers to a method of bending into a desired shape without raising the temperature of the glass to the softening point.

[0085] (Shape of cover glass)

[0086] Figure 3 is a top view of the cover glass. Figure 4 is a cross-sectional view of the cover glass. Figure 3 In the example of , the cover glass 12 is a rectangular flat glass plate bent. Hereinafter, one side (end face) of the cover glass 12 is referred to as the side face 12C1, the side face opposite to the side face 12C1 is referred to as the side face 12C2, the other side face of the cover glass 12 is referred to as the side face 12C3, and the side face opposite to the side face 12C3 is referred to as the side face 12C4.

[0087] exist Figure 3 In the example, the side surfaces 12C1 and 12C2 are the short sides of the rectangle, and the side surfaces 12C3 and 12C4 are the long sides of the rectangle. In addition, the cover glass 12 is not limited to a shape formed by bending a rectangular flat glass plate, but may be a shape formed by bending a glass plate of any shape. For example, the cover glass 12 may be a shape formed by bending a polygonal, circular, or elliptical flat glass plate.

[0088] (Bending of cover glass)

[0089] Figure 3 This is a diagram when the cover glass 12 is viewed from the normal direction (Z direction) of a position P on the main surface 12B of the cover glass 12. Figure 4 A cross section S of the cover glass 12 along the X direction is shown.

[0090] Here, among the tangent directions of the main surface 12B at an arbitrary point P of the main surface 12B of the cover glass 12, the tangent direction selected so as to satisfy the following conditions is set as the X direction (first direction), among the tangent directions of the main surface 12B at the point P, the direction orthogonal to the X direction is set as the Y direction, and the direction orthogonal to the X direction and the Y direction, that is, the normal direction (thickness direction) of the position P is set as the Z direction. Here, the X direction refers to the direction in which the radius of curvature of a line formed by a plane including the tangent direction and the normal direction intersecting the main surface 12B and the main surface 12B in the tangent direction of the main surface 12B at an arbitrary point P of the cover glass 12 is the smallest.

[0091] Since the cover glass 12 of this embodiment is uniaxially bent, the X direction can be uniquely defined regardless of the position P at any point. However, as in other examples in the later section, there is also a case where a plurality of curved portions 20 are provided and the bending directions of the respective curved portions 20 intersect. In this case, it is sufficient to define the X direction for each curved portion 20. That is, the direction in which the curvature radius of a line formed by a plane including the tangent direction and the normal direction in the tangent direction of the position P on one curved portion 20 and the main surface 12B is the smallest can be defined as the X direction of the curved portion 20, and the X direction can be defined for each curved portion 20 in the same manner.

[0092] In addition, when there are multiple tangent directions in which the curvature radius of a line formed by the intersection of a plane including the tangent direction and the normal direction and the main surface 12B becomes the smallest, at least one of these tangent directions can be set as the X direction. Hereinafter, the curvature radius of a line formed by the intersection of a plane including the X direction and the Z direction and the main surface 12B is recorded as the curvature radius R1.

[0093] It can be said that the cover glass 12 is bent with a curvature radius R, with the Y direction as the bending axis and the X direction as the direction orthogonal to the bending axis. The radius of curvature R of the cover glass 12 (the radius of curvature of the bend with the Y direction as the bending axis) is preferably greater than 50 mm and less than 10000 mm, more preferably greater than 100 mm and less than 5000 mm, and further preferably greater than 200 mm and less than 3000 mm. By making the radius of curvature R within this range, the design can be improved and peeling from the frame can be suppressed. Furthermore, the radius of curvature may be, for example, less than 2000 mm, less than 1750 mm, less than 1500 mm, less than 1250 mm, or less than 1000 mm. If the radius of curvature is within this range, although peeling from the frame has been prone to occur in the past, peeling can be intentionally suppressed by satisfying the formula of the present invention.

[0094] The cover glass 12 is preferably not bent in a direction other than the bending direction with the Y direction as the bending axis. The cover glass 12 is preferably not bent with the X direction as the bending axis. In other words, the track along the Y direction on the main surface 12B of the cover glass 12 is preferably a straight line. Among them, the so-called no curvature is not limited to an infinite radius of curvature, and may also include a radius of curvature greater than 10000 mm. In this way, by not bending in a direction other than the direction with the Y direction as the bending axis, the cover glass 12 can be unfolded into a plane and can be properly cold-formed.

[0095] Hereinafter, in the cover glass 12, a portion that is curved with the Y direction as the bending axis is referred to as a curved portion 20. The curved portion 20 refers to a region in the cover glass 12 that is curved with the Y direction as the bending axis and with the same curvature radius R. That is, it can be said that the curved portion 20 in the cover glass 12 is curved with the curvature radius R and with the Y direction as the bending axis. Figure 4 In the example of FIG. 2 , the entire cover glass 12 is curved in the X direction at the same curvature radius R, so it can be said that the entire cover glass 12 forms the curved portion 20 .

[0096] In addition, the same curvature radius R mentioned here does not limit the curvature radius R to be strictly the same at each position. For example, if the change in the curvature radius R measured at each position from the end point on one side to the end point on the other side in the X direction of the area bent with the Y direction as the bending axis on the main surface 12B of the cover glass 12 is 5% or less, that is, if the difference between the maximum value and the minimum value of the curvature radius R at each position is 5% or less of the maximum value of the curvature radius R at each position, then the area is regarded as an area with the same curvature radius and is handled as one curved portion 20. In addition, the average value of the curvature radius R at each position of the curved portion 20 can be handled as the curvature radius R of the curved portion 20.

[0097] The curvature radius R of the cover glass 12 may be measured by measuring the shape using a contact or non-contact three-dimensional measuring machine and obtaining it from shape data, or by pressing an R square ruler against the cover glass 12 .

[0098] In the present embodiment, the curved portion 20 is curved so as to be convex toward the principal surface 12A side. However, the curved portion 20 is not limited to being curved so as to be convex toward the principal surface 12A side, and may be curved so as to be convex toward the principal surface 12B side.

[0099] In addition, the arbitrary point P mentioned above is an arbitrary point in the curved portion 20 of the main surface 12B. For example, when the central area of ​​the main surface 12A is the curved portion 20, it may be the center position of the main surface 12B (for example, the center of gravity position of the cover glass 12). In other words, the X direction and the Y direction may be tangent directions from the center of the main surface 12B, and the Z direction may be the normal direction at the center of the main surface 12B.

[0100] (Length of the bend)

[0101] The length of the curved portion 20 in the X direction orthogonal to the bending axis is defined as the circumference L. The circumference L refers to the length of a line extending from an end point (position) on one side of the curved portion 20 in the X direction to an end point (position) on the other side of the curved portion 20 in the X direction and extending in the X direction on the principal surface 12B.

[0102] The line on the main surface 12B that faces the X direction is a line that faces the X direction without shifting in the Y direction along the main surface 12B. Figure 3 In the example, the endpoint of one side of the curved portion 20 in the X direction is a point on the side surface 12C1, and the endpoint of the other side of the curved portion 20 in the X direction is a point on the side surface 12C2. Therefore, the perimeter L refers to the length of a line from the side surface 12C1 to the side surface 12C2 on the main surface 12B toward the X direction.

[0103] The perimeter L is preferably 100 mm or more and 2000 mm or less, more preferably 150 mm or more and 700 mm or less, and further preferably 200 mm or more and 400 mm or less. Here, the perimeter L is preferably 100 mm or more, more preferably 150 mm or more, and further preferably 200 mm or less, more preferably 700 mm or less, and further preferably 400 mm or less. By making the perimeter L within this range, the appearance design can be improved and peeling from the frame can be suppressed.

[0104] In this embodiment, even in regions with the same radius of curvature R, regions with a circumference L of 5 mm or less (such as surface irregularities and fine corrugations) are not treated as curved portions 20. That is, regions with the same radius of curvature R and a circumference L longer than 5 mm are treated as curved portions 20.

[0105] The length of the bending portion 20 in the Y direction as the bending axis is preferably 80 mm or more and 500 mm or less, more preferably 100 mm or more and 400 mm or less, and further preferably 120 mm or more and 300 mm or less. Here, the length in the Y direction is preferably 80 mm or more, more preferably 100 mm or more, and further preferably 120 mm or more, and further preferably 500 mm or less, more preferably 400 mm or less, and further preferably 300 mm or less.

[0106] The length of the curved portion 20 in the Y direction refers to the length of a line extending from an end point (position) on one side of the curved portion 20 in the Y direction to an end point (position) on the other side of the curved portion 20 in the Y direction and extending in the Y direction on the principal surface 12B.

[0107] Here, the line on the main surface 12B that faces the Y direction refers to a line that faces the Y direction without shifting in the X direction along the main surface 12B. Figure 3 In the example, since each point is a point on the side surfaces 12C3 and 12C4, the length of the curved portion 20 in the Y direction refers to the length of a line extending from the side surface 12C3 to the side surface 12C4 and extending in the Y direction on the main surface 12B.

[0108] (Thickness of cover glass)

[0109] The thickness t of the cover glass 12 is preferably 0.3 mm or more and 3.0 mm or less, more preferably 0.4 mm or more and 1.5 mm or less, and further preferably 0.6 mm or more and 1.3 mm or less. Here, the thickness t is preferably 0.3 mm or more, more preferably 0.4 mm or more, and further preferably 0.6 mm or more, and further preferably 3.0 mm or less, more preferably 1.5 mm or less, and further preferably 1.3 mm or less. By making the thickness t within this range, the design can be improved and the peeling from the frame can be suppressed. Among them, the thickness t refers to the distance in the Z direction from the main surface 12A to the main surface 12B.

[0110] (Young's modulus of cover glass)

[0111] The Young's modulus E of the cover glass 12 is preferably 60 GPa or more and 90 GPa or less, more preferably 68 GPa or more and 78 GPa or less, and further preferably 72 GPa or more and 76 GPa or less. Here, the Young's modulus E is preferably 60 GPa or more, more preferably 68 GPa or more, and further preferably 72 GPa or more, and further preferably 90 GPa or less, more preferably 78 GPa or less, and further preferably 76 GPa or less. By making the Young's modulus E within this range, the design can be improved and the peeling from the frame can be suppressed.

[0112] (Material of cover glass)

[0113] The material of the glass used for the cover glass 12 is arbitrary, 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 glass 12, it is preferable that aluminosilicate glass or lithium aluminosilicate glass, which can easily generate large stress even with a thin thickness by strengthening treatment, and can obtain high-strength glass even with a thin thickness. Among them, the chemical strengthening treatment is usually performed by immersing the glass in a molten salt containing an alkali metal.

[0114] For the cover glass 12, it is preferred to contain 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 in terms of molar percentage based on oxides, but it is not particularly limited. Among them, the 50% to 80% here means that when the molar percentage of the total amount of the cover glass 12 is set to 100%, it is 50% or more and 80% or less, and the same applies to other numerical ranges. In addition, Li2O+Na2O+K2O refers to the total content of Li2O, Na2O and K2O. By setting the cover glass 12 to the following components, the rigidity can be appropriately maintained even when the cover glass 12 is bent.

[0115] More specifically, the following glass compositions can be cited as more preferable compositions of the glass for the cover glass 12. For example, "containing 0 to 25% of MgO" means that MgO is not essential but may be contained up to 25%.

[0116] The glass of (i) is included in soda-lime silicate glass, the glasses of (ii) and (iii) are included in aluminosilicate glass, and the glasses of (iv) and (v) are included in lithium aluminosilicate glass.

[0117] (i) Glass containing, expressed in mol %, 63% to 73% SiO2, 0.1% to 5.2% Al2O3, 10% to 16% Na2O, 0% to 1.5% K2O, 0% to 5.0% Li2O, 5% to 18% MgO and 1% to 10% CaO.

[0118] (ii) Glass whose components, expressed in mol %, contain 50% to 74% SiO2, 5% to 15% Al2O3, 10% to 20% Na2O, 0 to 8% 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 65% to 85%, the total content of Na2O and K2O is 12% to 25%, and the total content of MgO and CaO is 1% to 15%.

[0119] (iii) Glass whose composition, expressed in mol %, comprises 68% to 80% SiO2, 4% to 10% Al2O3, 5% to 15% Na2O, 0 to 1% K2O, 0 to 5.0% Li2O, 4% to 15% MgO and 0 to 1% ZrO2.

[0120] (iv) Glass comprising, expressed in mol%, 67% to 75% SiO2, 0% to 4% Al2O3, 7% to 15% Na2O, 1% to 9% K2O, 0% to 5.0% Li2O, 6% to 14% MgO and 0% to 1.5% ZrO2, wherein the total content of SiO2 and Al2O3 is 71% to 75%, the total content of Na2O and K2O is 12% to 20%, and when CaO is contained, its content is less than 1%.

[0121] (v) Glass whose components, expressed in mol %, comprise 50-73% SiO2, 5-20% Al2O3, 0-6% B2O3, 0-10% P2O5, 4-12% Li2O, 3-20% Na2O, 0-5% K2O, 0-8% MgO, 0-2% CaO, 0-5% SrO, 0-5% BaO, 0-5% ZnO, 0-2% TiO2, and 0-4% ZrO2.

[0122] (bonding area)

[0123] In the entire region of the main surface 12B of the curved portion 20, the region overlapping with the adhesive layer 16 is defined as the adhesive region AR, and the region not overlapping with the adhesive layer 16 is defined as the region AR0. The adhesive region AR is formed radially outside the region AR0 with the axis passing through the center position of the curved portion 20 in the Z direction as the axial direction.

[0124] In this embodiment, since the entire cover glass 12 forms the curved portion 20, the entire region of the main surface 12B of the cover glass 12 that overlaps with the adhesive layer 16 is the adhesive region AR. The adhesive region AR may be discontinuous or may include a plurality of discontinuous or patchy adhesive regions AR.

[0125] In addition, in the entire area of ​​the main surface 12B of the bending portion 20, the area overlapping with the first adhesive layer having an elastic modulus of 5 MPa or more (the area overlapping with the first adhesive layer in the bonding area AR) is defined as the first bonding area, and in the entire area of ​​the main surface 12B of the bending portion 20, the area overlapping with the second adhesive layer having an elastic modulus of less than 5 MPa (the area overlapping with the second adhesive layer in the bonding area AR) is defined as the second bonding area.

[0126] In this embodiment, since the cover glass 12 as a whole constitutes the curved portion 20, the area overlapping with the first adhesive layer in the entire area of ​​the main surface 12B of the cover glass 12 is the first adhesive area, and the area overlapping with the second adhesive layer in the entire area of ​​the main surface 12B of the cover glass 12 is the second adhesive area.

[0127] In this case, the area A1 of the first bonding region is preferably 8288 mm 2 The area A2 of the second bonding region is preferably 20214 mm 2 In addition, the value obtained by adding the area A1 of the first adhesive region and the area A2 of the second adhesive region (area AR in this embodiment) and dividing the perimeter L ((A1+A2) / L) is preferably 80 mm or less. In some cases, the area A1 of the first adhesive region is referred to as the area of ​​the first adhesive layer in the curved portion, and in some cases, the area A2 of the second adhesive region is referred to as the area of ​​the second adhesive layer in the curved portion.

[0128] This preferred numerical range is applicable to all of the cases where the first adhesive region is provided without the second adhesive region, the case where the second adhesive region is provided without the first adhesive region, and the case where both the first adhesive region and the second adhesive region are provided.

[0129] In the case where the second adhesive region is not provided but the first adhesive region is provided, the area A1 of the first adhesive region is preferably 350 mm 2 Above and 95000mm 2 Below, more preferably 740mm 2 Above and 25000mm 2 Below, more preferably 1500mm 2 Above and 8500mm2 Here, the area A1 of the first bonding region is preferably 350 mm 2 More than 740 mm, more preferably 2 More than, more preferably 1500mm 2 Above, preferably 95000mm 2 Below, more preferably 25000mm 2 Below, more preferably 8500mm 2 the following.

[0130] In this case, the value obtained by dividing the area A1 of the first adhesion region by the peripheral length L (A1 / L) is preferably 50 mm or less, more preferably 35 mm or less, and even more preferably 25 mm or less.

[0131] In addition, when the first adhesive region is not provided but the second adhesive region is provided, the area A2 of the second adhesive region is preferably 850 mm 2 Above and 230000mm 2 Below, more preferably 1700mm 2 Above and 60000mm 2 Below, more preferably 3800mm 2 Above and 20000mm 2 Here, the area A2 of the second bonding region is preferably 850 mm 2 More than 1700 mm, more preferably 2 More preferably, 3800 mm 2 Above, preferably 230000mm 2 Below, more preferably 60000mm 2 Below, more preferably 20000mm 2 the following.

[0132] In this case, the value obtained by dividing the area A2 of the second adhesion region by the peripheral length L (A2 / L) is preferably 115 mm or less, more preferably 85 mm or less, and even more preferably 50 mm or less.

[0133] In addition, when both the first adhesive region and the second adhesive region are provided, the area A1 of the first adhesive region is preferably 170 mm 2 Above and 47000mm 2 Below, more preferably 370mm 2 Above and 12000mm 2 Below, more preferably 790mm 2 Above and 4200mm 2In addition, the area A2 of the second bonding region is preferably 420 mm 2 Above and 110000mm 2 Below, more preferably 880mm 2 Above and 29000mm 2 Below, more preferably 1900mm 2 Above and 10000mm 2 Here, the area A1 of the first bonding region is preferably 170 mm 2 More than 370 mm is more preferred 2 Above, more preferably 790mm 2 Above, preferably 47000mm 2 Below, more preferably 12000mm 2 Below, more preferably 4200mm 2 In addition, the area A2 of the second bonding region is preferably 420 mm 2 More than 880 mm is more preferred 2 More than, more preferably 1900mm 2 More than, preferably 110000mm 2 Below, more preferably 29000mm 2 Below, more preferably 10000mm 2 the following.

[0134] In this case, the value obtained by adding the area A1 of the first bonding area and the area A2 of the second bonding area (area AR in this embodiment) and dividing the perimeter L ((A1+A2) / L) is preferably less than 80 mm, more preferably less than 60 mm, and further preferably less than 40 mm.

[0135] By setting the areas of the first and second adhesive regions to be within this range, it is possible to suppress the area AR0 displaying an image from becoming smaller and suppress peeling from the frame. In the adhesive region AR, for example, a printed layer is formed, and the region AR0 is used as a display portion, for example.

[0136] (Relationship between properties of cover glass)

[0137] Here, when the cover glass is bent and bonded to the frame, the cover glass may be peeled off from the frame due to rebound, that is, due to the force of the cover glass to return to a flat shape. As a result of intensive research, the inventors have come up with the idea that by setting the relationship between the characteristics of the cover glass 12 (in this embodiment, the relationship between the radius of curvature R, the thickness t, the Young's modulus E, the perimeter L and the area of ​​the first bonding area or the second bonding area) within an appropriate range, peeling from the frame can be suppressed. The relationship between the characteristics of the cover glass 12 is described below.

[0138] Hereinafter, the correction value of the curvature radius R of the curved portion 20 is referred to as the correction curvature radius R'. The correction curvature radius R' is expressed by the following formula (1). The correction curvature radius R' is the correction value of the curvature radius R when a flat region (flat portion) that is not curved is connected to both sides of the curved portion 20 in the X direction (one direction side and the other direction side in the X direction).

[0139] R′=R+F(5t-0.4)…(1)

[0140] The length F in the formula (1) is the length in the X direction of the flat portion with the shorter length in the X direction among the flat portions adjacent to both sides of the curved portion 20 in the X direction. That is, the length F is the length along the main surface of the flat portion from the end of one side in the X direction (the end of the side connected to the curved portion 20) to the end of the other side in the X direction of the flat portion (the end of the side not connected to the curved portion 20). In the present embodiment, since no flat portion is provided, F is zero, and the modified curvature radius R' is the same value as the curvature radius R. An example in which a flat portion is provided will be described later.

[0141] (When the main surface 12A is convex)

[0142] The case where the bent portion 20 is bent in a convex manner toward the main surface 12A side is described. When the bent portion 20 is bent in a convex manner toward the main surface 12A side, when C2 is set to a value shown in the following formula (5), when C2 is greater than 0 (C2>0), the bent portion 20 satisfies the following formula (6), and when C2 is less than 0 (C2≤0), the bent portion 20 satisfies the following formula (7). In addition, in formulas (5) to (7), A2 becomes zero when the second adhesion region is not provided, and A1 becomes zero when the first adhesion region is not provided.

[0143] C2=1000 / R′-4.54t 2 +11.37t-7.58+(0.586-0.44t 0.5 )(A2 / (A1+A2))

[0144] …(5)

[0145]

[0146] (A1+A2) / L>2.4…(7)

[0147] Formulas (5) to (7) are explained. Figure 5 This is an example of a graph for explaining the relationship between the characteristics of the cover glass. Figure 5 In the figure, the horizontal axis represents the corrected curvature radius R', and the vertical axis represents the value obtained by dividing the area (A1+A2) of the adhesion region AR by the perimeter L, which will be hereinafter appropriately described as the adhesion width.

[0148] Figure 5 The curve shows the value of the bonding width that becomes the boundary of frame peeling for each modified curvature radius R' when the thickness t and the Young's modulus E are set to predetermined values. That is, when the thickness t and the Young's modulus E are set to predetermined values, if the bonding width is set to Figure 5 The higher the curve is, the more likely it is that the frame peeling can be suppressed. Figure 5 As shown in the curve, the larger the correction radius of curvature R' becomes, the smaller the adhesive width that can suppress peeling can be. When the correction radius of curvature R' becomes greater than a certain value R'0, the adhesive width that can suppress peeling becomes constant.

[0149] like Figure 5 As shown in the curve graph, when C2 is less than 0, the adhesive width that can suppress peeling becomes constant. That is, C2 in formula (5) can be said to be an index value for judging whether the adhesive width that can suppress peeling becomes constant, and formula (7) can be said to be a formula for defining the adhesive width that can suppress peeling when the adhesive width that can suppress peeling becomes constant. That is, when C2 is less than 0, peeling can be suppressed by designing the curved portion 20 in a manner that satisfies formula (7). In other words, peeling can be suppressed by setting the modified curvature radius R', thickness t, perimeter L, area A1 and area A2 in a manner that C2 is less than 0, and setting the perimeter L, area A1 and area A2 in a manner that satisfies formula (7).

[0150] On the other hand, Figure 5As shown in the curve graph, when C2 is greater than 0, the adhesive width that can suppress peeling changes according to the modified curvature radius R' and the like. Formula (6) can be said to be a formula that specifies parameters such as the adhesive width that can suppress peeling when the adhesive width that can suppress peeling changes. That is, when C2 is greater than 0, peeling can be suppressed by designing the curved portion 20 in a manner that satisfies formula (6). In other words, peeling can be suppressed by setting the modified curvature radius R', thickness t, circumference L, area A1 and area A2 in a manner that C2 is greater than 0, and setting the modified curvature radius R', thickness t, Young's modulus E, circumference L, area A1 and area A2 in a manner that satisfies formula (6). In addition, Et in formula (6) 2 It is a parameter which shows the rigidity of the cover glass 12, and E(t / R') is a parameter which shows the bending stress.

[0151] (When the main surface 12B is convex)

[0152] The case where the bent portion 20 is bent in a convex manner toward the main surface 12B side is described. When the bent portion 20 is bent in a convex manner toward the main surface 12B side, when C1 is set to a value shown in the following formula (2), when C1 is greater than 0 (C1>0), the bent portion 20 satisfies the following formula (3), and when C1 is less than 0 (C1≤0), the bent portion 20 satisfies the following formula (4). In addition, in formulas (2) to (4), A2 becomes zero when the second adhesion region is not provided, and A1 becomes zero when the first adhesion region is not provided.

[0153] C1=1000 / R′-7.76t 2 +19.5t-12.7+(1-0.90t 0.5 )(A2 / (A1+A2))

[0154] …(2)

[0155]

[0156] (A1+A2) / L>2.4…(4)

[0157] like Figure 5As shown in the curve graph, when C1 is less than 0, the adhesive width that can suppress peeling becomes constant. C1 in formula (2) can be said to be an index value for judging whether the adhesive width that can suppress peeling becomes constant, and formula (4) can be said to be a formula that stipulates the adhesive width that can suppress peeling when the adhesive width that can suppress peeling becomes constant. That is, when C1 is less than 0, peeling can be suppressed by designing the curved portion 20 in a manner that satisfies formula (4). In other words, peeling can be suppressed by setting the modified curvature radius R', thickness t, perimeter L, area A1 and area A2 in a manner that C1 is less than 0, and setting the perimeter L, area A1 and area A2 in a manner that satisfies formula (4).

[0158] On the other hand, Figure 5 As shown in the curve graph, when C1 is greater than 0, the adhesive width that can suppress peeling changes according to the modified curvature radius R' and the like. Formula (3) can be said to be a formula that specifies parameters such as the adhesive width that can suppress peeling when the adhesive width that can suppress peeling changes. That is, when C1 is greater than 0, peeling can be suppressed by designing the curved portion 20 in a manner that satisfies formula (3). In other words, peeling can be suppressed by setting the modified curvature radius R', thickness t, perimeter L, area A1 and area A2 in a manner that C1 is greater than 0, and setting the modified curvature radius R', thickness t, Young's modulus E, perimeter L, area A1 and area A2 in a manner that satisfies formula (3).

[0159] When C1 is greater than 0 (C1>0), the curved portion 20 further preferably satisfies the following formula (6). In formula (6), A2 becomes zero when the second adhesion region is not provided, and A1 becomes zero when the first adhesion region is not provided.

[0160] When the curved portion 20 satisfies the formula (6), the cover glass 12 is more firmly bonded to the frame 14, and thus peeling is easily suppressed even when subjected to high temperature, thermal cycles, mechanical vibration shock, ultraviolet rays, and the like for a long period of time.

[0161] In addition, by making the curved portion 20 satisfy the formula (6), as Fig.13 As shown, when a curved portion convex toward the main surface 12A side is provided in addition to the curved portion convex toward the main surface 12B side, peeling can be suppressed even if the bonding widths with the frame are made the same in the two curved portions, thus having an advantage of excellent design properties.

[0162]

[0163] As described above, the glass product 10 according to the present embodiment includes: a cover glass 12 having a main surface 12A (first main surface) and a main surface 12B (second main surface); and a frame 14 bonded to the main surface 12B side of the cover glass 12 via an adhesive layer 16. The cover glass 12 is provided with a curved portion 20 formed in a shape convex toward the main surface 12A, and the adhesive layer 16 includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test. When R' is represented by formula (1) and C2 is represented by formula (5), when C2>0, the curved portion 20 satisfies formula (6), and when C2≤0, the curved portion 20 satisfies formula (7). The glass product 10 according to the present embodiment can suppress peeling from the frame 14 by making the curved portion 20 satisfy formula (6) or formula (7).

[0164] As described above, the glass product 10 according to the present embodiment includes: a cover glass 12 having a main surface 12A (first main surface) and a main surface 12B (second main surface); and a frame 14 bonded to the main surface 12B side of the cover glass 12 via an adhesive layer 16. The cover glass 12 is provided with a curved portion 20 formed in a shape convex toward the main surface 12B, and the adhesive layer 16 includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test. When R' is represented by formula (1) and C1 is represented by formula (2), when C1>0, the curved portion 20 satisfies formula (3), and when C1≤0, the curved portion 20 satisfies formula (4). The glass product 10 according to the present embodiment can suppress peeling from the frame 14 by making the curved portion 20 satisfy formula (3) or formula (4). Furthermore, when C1>0, the curved portion 20 preferably satisfies the equation (6).

[0165] (A1+A2) / L is preferably less than 80mm. By making (A1+A2) / L in this range, it is possible to suppress the narrowing of the area AR0, improve the design, or suppress the screen of the display image from becoming smaller. In addition, by making (A1+A2) / L in this range, it is possible to reduce the bonding area, easily fit, and improve the positional accuracy. In addition, (A1+A2) / L is more preferably less than 60mm. By making (A1+A2) / L in this range, it is possible to reduce bonding defects and thus reliably bond, and it is possible to promote exhaust, so that the adhesive is appropriately spread over the entire area of ​​the bonding area.

[0166] The adhesive layer 16 may include both a first adhesive layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer may be composed of different adhesives. By including both the first adhesive layer and the second adhesive layer, the cover glass 12 and the frame 14 can be properly bonded. For example, by providing adhesive layers with different characteristics, such as providing a second adhesive layer that has low adhesive strength like a double-sided tape but exhibits adhesive strength immediately after bonding, and providing a first adhesive layer that has high final adhesive strength like a moisture-curing adhesive but takes time to develop strength, the cover glass 12 and the frame 14 can be bonded with good positional accuracy and sufficient adhesive strength.

[0167] Figure 6 1 is a diagram showing an example of a case where both the first adhesive layer and the second adhesive layer are provided. In the case where both the first adhesive layer and the second adhesive layer are provided, it is preferred that the second adhesive layer AR2 is provided at a position radially outward of the first adhesive layer AR1. By providing a second adhesive region with low adhesive force on the outside, for example, the second adhesive region (such as a double-sided tape) functions as a dam for the adhesive of the first adhesive region, it is possible to suppress the adhesive of the first adhesive region from overflowing outward before being cured.

[0168] exist Figure 6 In the example, the second adhesive layer AR2 is provided radially outward of the first adhesive layer AR1 while the outer periphery of the first adhesive layer AR1 and the inner periphery of the second adhesive layer AR2 are separated. Figure 6 This is an example, and when both the first adhesive layer and the second adhesive layer are provided, the position of the first adhesive layer and the position of the second adhesive layer can be set arbitrarily.

[0169] The thickness t of the cover glass 12 is preferably 0.3 mm or more and 3.0 mm or less. By setting the thickness t to be within this range, peeling from the frame 14 can be appropriately suppressed.

[0170] The curvature radius R of the curved portion 20 is preferably 50 mm or more and 10000 mm or less. By setting the curvature radius R to be within this range, the design property can be improved and the peeling from the frame 14 can be appropriately suppressed.

[0171] It is preferable that the Young's modulus E of the cover glass 12 is 60 GPa or more and 90 GPa or less. When the Young's modulus E is within this range, the peeling from the frame 14 can be appropriately suppressed.

[0172] The vehicle-mounted display device 2 according to the present embodiment includes a display 3 and a glass product 10 provided on the surface (front surface) of the display 3. The vehicle-mounted display device 2 can suppress the frame 14 from peeling off from the cover glass 12.

[0173] (Other examples)

[0174] Hereinafter, other examples of the shape of the cover glass 12 will be described.

[0175] (Example of spline shape)

[0176] Figure 7 Schematic diagram of cover glass according to another example of the present embodiment. In the above embodiment, the curved portion 20 is described as a portion curved with a constant curvature radius R, but there is also a case where the curvature radius is a spline curve with an irregular curvature radius and is curved in the X direction. In this case, the entire portion curved in the X direction in the spline curve is treated as the curved portion 20.

[0177] In the description of the above embodiment, the area on the main surface 12B that is bent with the Y direction as the bending axis, in which the change in the curvature radius R measured at each position from the end point on one side to the end point on the other side in the X direction is less than 5%, is treated as a curved portion 20 with the same curvature radius.

[0178] On the other hand, in this example, in the region of the main surface 12B that is bent with the Y direction as the bending axis, the region where the change in the curvature radius R at each position is greater than 5% in a section of 50 mm or less from one end point in the X direction toward the other end point is treated as one curved portion 20 of the spline shape. Figure 7 As shown, the spline-shaped curved portion 20 is approximated to a shape curved with a constant radius of curvature, and the curvature radius when the shape is approximated to a shape curved with a constant radius of curvature is treated as the curvature radius R of the curved portion 20 .

[0179] Specifically, one end point of the main surface 12B of the spline-shaped curved portion 20 in the X direction is defined as an end point 20J, and the other end point is defined as an end point 20K. The plane along the X direction and the Y direction (i.e., the XY plane passing through the end points 20J and 20K) connecting the end points 20J and 20K is defined as a plane α. Furthermore, when a plane β is defined as a plane obtained by translating the plane α in the Z direction so as to be tangent to the main surface 12B, the curvature radius of the arc 20R passing through the end points 20J and 20K and being tangent to the plane β is defined as the curvature radius R of the curved portion 20.

[0180] (Example with flat portion)

[0181] Figure 8 and Fig. 9 Schematic diagram of cover glass according to another example of the present embodiment. The flat portion 22 may be connected to the curved portion 20 in the X direction. The flat portion 22 is connected to the curved portion 20 in a manner that the main surface 12B is continuous with the curved portion 20 (not discontinuous). Figure 8 This is an example of a case where the flat portion 22 is connected to one side (one side) in the X direction of the curved portion 20. The flat portion 22 is a flat portion connected to the end of the curved portion 20 in the X direction in the entire region of the cover glass 12. The flat portion 22 is not limited to having an infinite radius of curvature, and may also include a radius of curvature greater than 10000 mm.

[0182] When the curved portion 20 is connected to the flat portion 22, the curved portion 20 and the flat portion 22 are treated as one curved portion 20a in terms of the application of equations (1) to (7). Figure 8 In that case, when the flat portion 22 is provided on one side of the curved portion 20 in the X direction and the flat portion 22 is not provided on the other side in the X direction, the length of the curved portion 20a in the bending direction, i.e., the X direction (the total value of the length of the curved portion 20 in the X direction and the length F of the flat portion 22) is regarded as the circumference L.

[0183] In addition, the area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the curved portion 20a (the total value of the area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the curved portion 20 and the area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the flat portion 22) is regarded as the area A1. In addition, the area of ​​the region overlapping with the second adhesive layer in the main surface 12B of the curved portion 20a (the total value of the area of ​​the region overlapping with the second adhesive layer in the main surface 12B of the curved portion 20 and the area of ​​the region overlapping with the second adhesive layer in the main surface 12B of the flat portion 22) is regarded as the area A2.

[0184] However, when the flat portion 22 is provided on one side of the curved portion 20 in the X direction and the flat portion 22 is not provided on the other side in the X direction, the length F in the formula (1) is regarded as zero, as in the case where there is no flat portion 22. In other words, when the curved portion 20 is provided only on one side, the corrected curvature radius R' becomes the same value as the curvature radius R.

[0185] like Fig. 9 As shown, the flat portion 22 may be provided so as to be connected to both sides of the curved portion 20 in the X direction (one direction side and the other direction side in the X direction).

[0186] like Fig. 9As shown in FIG. 1 , when the lengths of the flat portion 22 on one side and the flat portion 22 on the other side of the curved portion 20 along the main surface 12B are different in the X direction, the curved portion 20 and the flat portion 22 with the shorter length along the main surface 12B are treated as one curved portion 20a. That is, the length of the shorter flat portion 22 along the main surface 12B is regarded as the length F in the formula (1), and the length of the curved portion 20a in the X direction (the total value of the length of the curved portion 20 and the length F of the shorter flat portion 22) is regarded as the circumference L.

[0187] In addition, the area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the curved portion 20a (the total area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the curved portion 20 and the area of ​​the region overlapping with the first adhesive layer in the main surface 12B of the shorter flat portion 22) is regarded as area A1.

[0188] In addition, the area of ​​the region overlapping with the second adhesive layer on the main surface 12B of the curved portion 20a (the total value of the area of ​​the region overlapping with the second adhesive layer on the main surface 12B of the curved portion 20 and the area of ​​the region overlapping with the second adhesive layer on the main surface 12B of the shorter flat portion 22) is regarded as the area A2. However, when the lengths of the flat portion 22 on one side and the flat portion 22 on the other side of the curved portion 20 in the X direction along the main surface 12B are the same, the flat portion 22 on either side and the curved portion 20 are treated as one curved portion 20a.

[0189] (Example when there are multiple curved portions)

[0190] Fig.10 and Fig.11 2 is a schematic diagram of a cover glass according to another example of the present embodiment. A plurality of curved portions 20 may be provided, in other words, a plurality of curved portions 20 having different curvature radii R may be formed on the cover glass 12. In this case, each curved portion 20 is curved with the same direction, that is, the Y direction, as the bending axis.

[0191] In the case where there are multiple curved portions 20, it can be determined as follows. That is, for a region where the change in the radius of curvature R at each position in a section longer than 50 mm from one end point in the X direction to the other end point in the region curved with the Y direction as the bending axis on the main surface 12B is greater than 5%, it is determined that multiple curved portions 20 with different radiuses of curvature R are formed. That is, when the change in the radius of curvature R in a section less than 50 mm from one end point in the X direction to the other end point in the region curved with the Y direction as the bending axis on the main surface 12B is less than 5%, but when the change in the radius of curvature R in a section longer than 50 mm from one end point to the other end point exceeds 5%, it is determined that a single curved portion of a spline shape is not formed, but a plurality of curved portions are formed.

[0192] In this case, if Fig.10 As shown in the example, in the region on the main surface 12B that is bent with the Y direction as the bending axis, the region in which the change in the radius of curvature R at each position in the interval from the end point 20L on one side of the region in the X direction toward the end point 20M on the other side is 5% or less is defined as one curved portion 20A having the same radius of curvature R. The curved portion 20A is the region from the end point 20L on one side to the position 20N where the change in the radius of curvature R is greater than 5%. Furthermore, the region in which the change in the radius of curvature R at each position in the interval from the position 20N toward the end point 20M on the other side is 5% or less is defined as another curved portion 20B.

[0193] exist Fig.10 In the example, since the change in the curvature radius R in the section from the position 20N to the end point 20M is 5% or less, the region from the position 20N to the end point 20M is regarded as the curved portion 20B. However, for example, if there is a position from the position 20N to the end point 20M where the change in the curvature radius R is greater than 5%, the region from the position 20N to the position where the change in the curvature radius R is greater than 5% becomes one curved portion 20B. In this case, there are three or more curved portions 20.

[0194] In this way, when a plurality of bent portions 20 are formed, equations (1) to (7) are applied to each bent portion 20. That is, each bent portion 20 satisfies equation (6) or (7) when convex toward the main surface 12A side, and satisfies equation (3) or (4) when convex toward the main surface 12B side. Fig.10 An example is shown in which a curved portion 20A having a curvature radius of R1 and a curved portion 20B having a curvature radius of R2 are formed. Fig.10In the example of FIG. 1 , both the curved portions 20A and 20B protrude toward the main surface 12A, but the present invention is not limited thereto, and both the curved portions 20A and 20B may protrude toward the main surface 12B. In addition, the number of the curved portions 20 is not limited to two, and may be three or more.

[0195] Fig.11 This is an example of a case where a plurality of curved portions 20 are connected to a flat portion 22. When a plurality of curved portions 20 are connected to a flat portion 22, when equations (1) to (7) are applied, one curved portion 20 and the flat portion 22 connected to the curved portion 20 are treated as one curved portion 20a.

[0196] exist Fig.11 In the example, a long flat portion 22 is connected to one side of the curved portion 20A in the X direction, a short flat portion 22 is connected to the other side of the curved portion 20A in the X direction, and a curved portion 20B is connected to the short flat portion 22 on the opposite side of the curved portion 20A. In this case, the curved portion 20A and the short flat portion 22 are regarded as one curved portion 20a, and the curved portion 20B and the short flat portion 22 are regarded as another curved portion 20a. The calculation method of the length F, the perimeter L, the area A1, and the area A2 of the curved portion 20a is the same as the case where the flat portion 22 is connected to one curved portion 20, so the description is omitted. In addition, in Fig.11 In the example of , since the flat portion 22 is connected to only one side of the curved portion 20A, the length F in the equation (1) in the curved portion 20A is regarded as zero.

[0197] Fig.12 and Fig.13 2 is a schematic diagram of a cover glass according to another example of the present embodiment. In the above description, the plurality of curved portions 20 protrude in the same direction, but they may protrude in different directions. Fig.12 As shown, the bent portion 20A is convex toward the main surface 12A side, and the bent portion 20B is convex toward the main surface 12B side.

[0198] In addition, Fig.13In the example, a long flat portion 22 is connected to one side of the curved portion 20A in the X direction, a short flat portion 22 is connected to the other side of the curved portion 20A in the X direction, and a curved portion 20B is connected to the side of the short flat portion 22 opposite to the curved portion 20A. In this case, the curved portion 20A and the short flat portion 22 are regarded as one curved portion 20a, and the curved portion 20B and the short flat portion 22 are regarded as another curved portion 20. The calculation method of the length F, the perimeter L, the area A1, and the area A2 of the curved portion 20a is the same as the case where the flat portion 22 is connected to one curved portion 20, so the description is omitted. In addition, equations (1) to (7) are applied to each curved portion. That is, since the curved portion 20A is convex to the main surface 12A side, equation (6) or equation (7) is satisfied, and since the curved portion 20B is convex to the main surface 12B side, equation (3) or equation (4) is satisfied.

[0199] Figure 14 to Figure 17 Schematic diagram of cover glass according to another example of the present embodiment. In the above embodiment, since a rectangular glass plate is bent in the X direction to form the cover glass 12, the length of the cover glass 12 in the X direction is constant at each position, but the length of the cover glass 12 in the X direction may be different at each position depending on the shape. The perimeter L in such a case will be described below.

[0200] As described above, the perimeter L refers to the length of a line extending from the position of the curved portion 20 closest to one side in the X direction relative to the bending axis YA along the direction Y to the position of the curved portion 20 closest to the other side in the X direction relative to the bending axis YA, and extending in the X direction on the principal surface 12B. Fig.14 As shown, when a trapezoidal glass plate is bent with the Y direction as the bending axis to form a cover glass 12, the two end points of the long side of the trapezoid, i.e., the side surface 12C3, become the position 20C closest to one side and the position 20D closest to the other side of the curved portion 20 in the X direction relative to the bending axis YA, and the length of the line connecting the position 20C and the position 20D and extending in the X direction on the main surface 12B becomes the circumference L.

[0201] In addition, in the above description, the X direction orthogonal to the bending axis runs along the lateral edges of the flat cover glass 12 before bending, namely the side surfaces 12C3 and 12C4, but this is not limited to this. The X direction orthogonal to the bending axis may also be offset relative to (or may cross) the edges of the flat cover glass 12 before bending. Fig.15 An example is shown in which the X direction intersects the side surfaces 12C3 and 12C4 of the flat cover glass 12 before bending. Fig.15In the example, the endpoint of one side 12C3, which is the long side of the trapezoid, is at position 20C, and the endpoint of the other side 12C4, which is the short side of the trapezoid, is at position 20D. Fig.15 In the example, since the positions of position 20C and position 20D in the Y direction are not consistent, the length of the line extending along the main surface 12B in the X direction and connecting position 20D' which is offset in the Y direction with position 20C is taken as the perimeter L. Fig.15 In the example of FIG. 1 , the length of the curve connecting the position 20C and the position 20D′ and having a curvature radius of R is the perimeter L. The position 20D′ is a position obtained by shifting the position 20D in the Y direction so that the position in the Y direction coincides with the position in the Y direction of the position 20C. Thus, when the positions in the Y direction of the position 20C and the position 20D do not coincide, the length of the line extending in the X direction along the surface of the main surface 12B from the position 20C to the position 20D′, which coincides with each other in the Y direction, is the perimeter L.

[0202] Fig.16 This is an example of a case where a polygonal glass plate is bent with a line segment YA along the direction Y as a bending axis to form the cover glass 12. Fig.16 Similarly, in the example, the positions of the points on the one side and the other side of the bending axis YA of the bending portion 20 in the X direction, i.e., positions 20C and 20D in the Y direction, are inconsistent, so the length of the line connecting position 20D' and position 20C and facing the X direction along the main surface 12B is taken as the circumference L.

[0203] Fig.17 This is an example of a case where a glass plate having a curved outer periphery is bent with a line segment YA along the direction Y as a bending axis to form the cover glass 12. Fig.17 Similarly, in the example, the positions of the points on the one side and the other side of the bending axis YA of the bending portion 20 in the X direction, i.e., positions 20C and 20D in the Y direction, are inconsistent, so the length of the line connecting position 20D' and position 20C and facing the X direction along the main surface 12B is taken as the circumference L.

[0204] Figures 18 to 20Schematic diagram of cover glass involved in other examples of the present embodiment. In the above description, the plurality of curved portions 20 are bent in the same direction with the Y direction as the bending axis, but the directions of the bending axes of the plurality of curved portions 20 may be different. In this case, the bending axes of the respective curved portions 20 do not intersect on the main surface 12A of the cover glass 12, but intersect at a point obtained by extending the bending axes of the respective curved portions 20 toward the outside of the main surface 12A. Even when the directions of the bending axes of the curved portions 20 are different, the bending axes do not intersect each other on the main surface 12A, so the cover glass 12 can be unfolded into a plane and can be properly cold-formed.

[0205] Fig.18 and Fig.19 An example of a schematic diagram of a cover glass 12 in which the directions of the bending axes of the plurality of bent portions 20 are different is shown. Fig.18 In the example, the bent portion 20A is connected to one side of the flat portion 22 in the X direction, and the bent portion 20B is connected to the other side of the flat portion 22 in the X direction.

[0206] The curved portion 20A is curved from the side surface 12C1, which is one end side in the X direction, to the end side 20P on the other side, with the curved axis YA being the curved axis. That is, the curved portion 20A is a region curved with the curved axis YA being the curved axis so that the change in the radius of curvature at each position in the X direction from the side surface 12C1 to the end side 20P is 5% or less.

[0207] The curved portion 20B is curved with the bending axis YB as the bending axis from the end side 20Q on one side in the X direction to the end side 12C2 on the other side. That is, the curved portion 20B is a region curved with the bending axis YB as the bending axis so that the change in the curvature radius at each position in the X direction from the end side 20Q to the side side 12C2 is 5% or less. The flat portion 22 is a flat region from the end side 20P to the end side 20Q in the X direction.

[0208] Although the bending axis YA of the curved portion 20A and the bending axis YB of the curved portion 20B extend in different directions, they do not intersect on the main surface 12A of the cover glass 12, but intersect at a point obtained by extending the bending axes YA and YB outward from the main surface 12A. In addition, for convenience of explanation, Fig.18 Although the figure shows that the Y direction is the bending axis, that is, the bending axes YA and YB are in the same direction, in fact, the bending axes YA and YB of the bending portions 20A and 20B extend in directions different from each other.

[0209] When a plurality of curved portions 20 having different bending axis directions are connected to the flat portion 22, when equations (1) to (7) are applied, one curved portion 20 and the flat portion 22 connected thereto are treated as one curved portion 20a.

[0210] exist Fig.19 In the example of , the flat portion 22 is connected to the other side of the curved portion 20A in the X direction, and the flat portion 22 is connected to one side of the curved portion 20B in the X direction. In this case, the curved portion 20A and the flat portion 22 are regarded as one curved portion 20a, and the curved portion 20B and the flat portion 22 are regarded as another curved portion 20a. The calculation method of the length F, the area A1, and the area A2 of the curved portion 20a is the same as the case where the flat portion 22 is connected to one curved portion 20, so the description is omitted. Fig.19 In the example of , since the flat portion 22 is connected to only one side of the curved portions 20A and 20B, the length F of the equation (1) in the curved portions 20A and 20B is regarded as zero.

[0211] based on Fig. 20 , the calculation method of the circumference L in a plurality of curved portions 20 having different bending axis directions is described. For convenience of description, Fig. 20 FIG. 2 is a diagram in which the curved portion 20a including the curved portion 20A and the flat portion 22 is extracted. Fig. 20 In the example, the end point of the side surface 12C1 on one side in the X direction is the position 20C of the bent portion 20a, and the end point of the end side 20P' on the other side in the X direction is the position 20D of the bent portion 20a.

[0212] exist Fig. 20 In the example, since the positions of position 20C and position 20D in the Y direction are not consistent, the length of the line extending along the main surface 12B in the X direction and connecting position 20D' which is offset in the Y direction with position 20C is taken as the perimeter L of the curved portion 20a. Fig. 20 In the example of , the length of the curve connecting the position 20C and the position 20D′ and having a curvature radius of R is the circumference L. The circumference L is also obtained in the same manner for the curved portion 20a including the curved portion 20B and the flat portion 22, but the description thereof is omitted.

[0213] Example

[0214] Next, the embodiments are described. In addition, the implementation method may be changed as long as the effect of the invention is achieved. In each example, either an actual test or a test based on simulation was performed. In the actual test column in Tables 1 to 10 described later, a column marked as "yes" indicates that an actual test was performed, and a blank column indicates that a simulation was performed. Figure 21 to Figure 42 The circles in the drawing are the results of actual experiments.

[0215] (simulation)

[0216] In the simulation, impact collision analysis software (PAM-CRASH manufactured by ESI Co., Ltd., Japan) using the finite element method was used. In the simulation, COS3D (Material Type 305) capable of setting the bond fracture energy was used as the adhesive layer, and the bond fracture energy EFRSn was set in a manner consistent with the actual test. In the simulation, first, the elastic energy of bending (as stress accumulation of the glass) was given to the glass plate.

[0217] Next, the bent glass sheet is bonded to the frame via the adhesive layer. Due to the elasticity of the glass, the adhesive layer and the frame are deformed, and the element in the adhesive layer where the adhesive energy exceeds the adhesive fracture energy disappears, so the phenomenon of glass peeling off from the frame can be expressed through simulation. In addition, it has been confirmed that there is no deviation between the simulation results and the actual test results. In addition, the adhesive fracture energy of the weak adhesive layer in the simulation is set based on the actual test results of the weak adhesive layer.

[0218] (Simulation conditions)

[0219] A model corresponding to the actual test was made according to the following physical properties and the conditions described in each example, and it was determined whether peeling occurred. The case where no peeling occurred was marked as A (can be bonded), and the case where peeling occurred within 2msec was marked as B (cannot be bonded). · Young's modulus of glass plate: 70GPa (G=29.17, K=38.89), 74GPa (G=30.08, K=45.68), 77GPa (G=31.56, K=45.83) · Young's modulus of frame: 206GPa (G=79.231, K=171.667)

[0220] Here, G is the shear elastic coefficient and K is the volume elastic coefficient.

[0221] (Actual test)

[0222] In the actual test, an aluminosilicate glass plate made by AGC (product name: Longji) was used as a glass plate. The glass plate was bent in the horizontal direction (X direction) so as to protrude toward the side not bonded to the frame (first main surface side) or to the side bonded to the frame (second main surface side), and used as a cover glass bent in the X direction, and bonded to a frame-shaped frame via an adhesive layer so that the end of the peripheral side does not protrude from the frame. A frame made of rolled steel SS400 was used, and a strong adhesive layer (first adhesive layer) of ThreeBond 1539 or a weak adhesive layer (second adhesive layer) of 3M VHX-1701-04 was used as an adhesive layer.

[0223] In the actual test, the appearance inspection after 200 hours evaluated whether the cover glass peeled off from the frame. The case where no peeling occurred after 200 hours was rated as A (bonding was possible), and the case where peeling occurred after 200 hours was rated as B (unbonding).

[0224]

Table 1

[0225]

[0226] (Example 1, Example 2)

[0227] Table 1 is a table showing the characteristics of the cover glasses of Examples 1 and 2. Fig.21 It is a graph which shows the evaluation results of each cover glass of Example 1 and Example 2.

[0228] In Examples 1 and 2, a rectangular glass plate with a thickness t of 1.1 mm, a vertical (Y direction) length of 150 mm, and a horizontal (X direction) length of 250 mm was prepared. The glass plate was assumed to have a Young's modulus of 74 GPa and was an AGC aluminosilicate (product name: Longji) glass plate.

[0229] In Examples 1 and 2, the cover glass is bent in the horizontal direction (X direction) so as to be convex toward the side (second main surface side) bonded to the frame, so that no flat portion is formed and the whole is a curved portion. As the adhesive layer, an adhesive (made by ThreeBond, adhesive 1539) equivalent to the first adhesive layer is assumed. It is assumed that the frame is a frame made of rolled steel SS400. In Examples 1 and 2, a plurality of samples having different curvature radii R, areas A1, and perimeters L as shown in Table 1 are prepared.

[0230] Fig.21 This is a graph plotting the relationship between the radius of curvature R of each sample of Example 1 and Example 2 and the value obtained by dividing the area of ​​the adhesion region (here, the area A1 of the first adhesion region) by the perimeter L (adhesion width). Fig.21 The solid line is a boundary line indicating whether or not the equation (3) or (4) is satisfied. It can be said that samples whose vertical axis values ​​are above the solid line satisfy the equation (3) or (4).

[0231] Fig.21 The dotted line is the boundary line that satisfies the formula (6), and samples whose values ​​on the vertical axis are above the dotted line satisfy the formula (6).

[0232] It is found that Example 1 as a comparative example does not satisfy Formula (3) or Formula (4), resulting in the cover glass peeling from the frame, and it is found that Example 2 as an embodiment satisfies Formula (3) or Formula (4), and can suppress the cover glass from peeling from the frame.

[0233]

Table 2

[0234]

[0235] (Example 3, Example 4)

[0236] Table 2 is a table showing the characteristics of the cover glasses of Examples 3 and 4. Fig. 22 It is a graph which shows the evaluation results of each cover glass of Example 3 and Example 4.

[0237] In Examples 3 and 4, a portion of the cover glass is bent, and flat portions are formed on both sides of the bent portion. In Examples 3 and 4, a plurality of samples having different curvature radii R, areas A1, and perimeters L are prepared as shown in Table 2. Other points are the same as in Examples 1 and 2.

[0238] As shown in Table 2 and Fig. 22 As shown, it can be seen that Example 3 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 4 as an embodiment satisfies formula (3) or formula (4), and can suppress the cover glass from peeling off from the frame. In addition, some samples in Example 4 also satisfy formula (6).

[0239]

Table 3

[0240]

[0241] (Example 5, Example 6)

[0242] Table 3 is a table showing the characteristics of the cover glasses of Examples 5 to 10. Fig.23 It is a graph which shows the evaluation results of each cover glass of Example 5 and Example 6.

[0243] In Examples 5 and 6, the thickness of the cover glass was set to 0.7 mm, and the radius of curvature R, the area A1, and the perimeter L were set as shown in Table 3. The same procedures as in Examples 1 and 2 were followed.

[0244] As shown in Table 3 and Fig.23 As shown, it can be seen that Example 5 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 6 as an embodiment satisfies formula (3) or formula (4), and can suppress the cover glass from peeling off from the frame. In addition, some samples in Example 6 also satisfy formula (6).

[0245] (Example 7, Example 8)

[0246] Fig.24 It is a graph which shows the evaluation results of each cover glass of Example 7 and Example 8.

[0247] In Examples 7 and 8, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the curvature radius R, area A1, and perimeter L were set as shown in Table 3. The same procedures were used as in Examples 5 and 6, except that the curvature radius R, area A1, and perimeter L were set as shown in Table 3.

[0248] As shown in Table 3 and Fig.24 As shown, it can be seen that Example 7 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 8 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0249] (Example 9, Example 10)

[0250] Fig.25 It is a graph which shows the evaluation results of each cover glass of Example 9 and Example 10.

[0251] In Examples 9 and 10, the thickness of the cover glass was set to 0.5 mm, and the radius of curvature R, the area A1, and the perimeter L were set as shown in Table 3. The same procedures as in Examples 1 and 2 were followed.

[0252] As shown in Table 3 and Fig.25 As shown, it can be seen that Example 9 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 10 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0253]

Table 4

[0254]

[0255] (Example 11, Example 12)

[0256] Table 4 is a table showing the characteristics of the cover glasses of Examples 11 and 12. Fig.26 It is a graph which shows the evaluation results of each cover glass of Example 11 and Example 12.

[0257] In Examples 11 and 12, an adhesive equivalent to the second adhesive layer (3M double-sided tape, VHX-1701-04) is used as the adhesive layer, and the radius of curvature R, area A2 and perimeter L are set as shown in Table 4. Other than that, the same as Examples 1 and 2 are used.

[0258] As shown in Table 4 and Fig.26 As shown, it can be seen that Example 12 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 11 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0259]

Table 5

[0260]

[0261] (Example 13, Example 14)

[0262] Table 5 is a table showing the characteristics of the cover glasses of Examples 13 and 14. Fig. 27 It is a graph which shows the evaluation results of each cover glass of Example 13 and Example 14.

[0263] In Examples 13 and 14, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A2, and perimeter L were set as shown in Table 5. The same procedures were used as in Examples 11 and 12, except that the radius of curvature R, area A2, and perimeter L were set as shown in Table 5.

[0264] As shown in Table 5 and Fig. 27 As shown, it can be seen that Example 13 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 14 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0265] In addition, in some samples in Example 14, equation (6) is also satisfied.

[0266]

Table 6

[0267]

[0268] (Example 15, Example 16)

[0269] Table 6 is a table showing the characteristics of the cover glasses of Examples 15 to 20 and 41 to 44. Fig.28 It is a graph which shows the evaluation results of each cover glass of Example 15 and Example 16.

[0270] In Examples 15 and 16, the thickness of the cover glass was set to 0.7 mm, and the radius of curvature R, the area A2, and the perimeter L were set as shown in Table 6. The same procedures as in Examples 11 and 12 were used.

[0271] As shown in Table 6 and Fig.28 As shown, it can be seen that Example 15 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 16 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0272] In addition, in some samples in Example 16, equation (6) is also satisfied.

[0273] (Example 17, Example 18)

[0274] Fig.29 It is a graph showing the evaluation results of each cover glass of Example 17 and Example 18.

[0275] In Examples 17 and 18, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A2, and perimeter L were set as shown in Table 6. The same procedures were used as in Examples 15 and 16.

[0276] As shown in Table 6 and Fig.29 As shown, it can be seen that Example 17 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 18 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0277] (Example 19, Example 20)

[0278] Fig.30 It is a graph showing the evaluation results of each cover glass of Example 19 and Example 20.

[0279] In Examples 19 and 20, the thickness of the cover glass was set to 0.5 mm, and the radius of curvature R, the area A2, and the perimeter L were set as shown in Table 6. The same procedures as in Examples 11 and 12 were used.

[0280] As shown in Table 6 and Fig.30 As shown, it can be seen that Example 19 as a comparative example does not satisfy formula (3) or formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Example 20 as an embodiment satisfies formula (3) or formula (4) and can suppress the cover glass from peeling off from the frame.

[0281] In addition, in some samples in Example 20, equation (6) is also satisfied.

[0282] (Examples 41~44)

[0283] Fig.41 , 42 It is a graph which shows the evaluation results of each cover glass of Examples 41 to 44.

[0284] Examples 41 to 44 were the same as Examples 11 and 12 except that the Young's modulus of the glass plate was 70 GPa or 77 GPa, and the radius of curvature R, the area A2, and the perimeter L were as shown in Table 6.

[0285] As shown in Table 6 and Fig.41 , 42 As shown, it can be seen that Examples 42 and 44 as comparative examples do not satisfy Formula (3) or Formula (4), resulting in the cover glass peeling off from the frame, and it can be seen that Examples 41 and 43 as embodiments satisfy Formula (3) or Formula (4), which can prevent the cover glass from peeling off from the frame.

[0286]

Table 7

[0287]

[0288] (Example 21, Example 22)

[0289] Table 7 is a table showing the characteristics of the cover glasses of Examples 21 to 24. Fig.31 It is a graph showing the evaluation results of each cover glass of Example 21 and Example 22.

[0290] In Examples 21 and 22, the structure is the same as that of Examples 1 and 2 except that the structure is bent in the transverse direction (X direction) so as to protrude toward the side not bonded to the frame (the first main surface side), and the radius of curvature R, area A1, and circumference L are set as shown in Table 7.

[0291] As shown in Table 7 and Fig.31 As shown, it can be seen that Example 21 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 22 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0292] (Example 23, Example 24)

[0293] Fig.32 It is a graph showing the evaluation results of each cover glass of Example 23 and Example 24.

[0294] In Examples 23 and 24, an adhesive equivalent to the second adhesive layer (3M double-sided tape, VHX-1701-04) is used as the adhesive layer, and the radius of curvature R, area A2 and circumference L are set as shown in Table 7. Other than that, the same as Examples 21 and 22 are used.

[0295] As shown in Table 7 and Fig.32 As shown, it can be seen that Example 24 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 23 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0296]

Table 8

[0297]

[0298] (Example 25, Example 26)

[0299] Table 8 is a table showing the characteristics of the cover glasses of Examples 25 to 28. Fig.33 It is a graph showing the evaluation results of each cover glass of Example 25 and Example 26.

[0300] In Examples 25 and 26, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A2, and perimeter L were set as shown in Table 8. Other than that, the same procedures were followed as in Examples 23 and 24.

[0301] As shown in Table 8 and Fig.33 As shown, it can be seen that Example 25 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 26 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0302] (Example 27, Example 28)

[0303] Fig.34 It is a graph showing the evaluation results of each cover glass of Example 27 and Example 28.

[0304] In Examples 27 and 28, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A1, and perimeter L were set as shown in Table 8. The same procedures were used as in Examples 21 and 22.

[0305] As shown in Table 8 and Fig.34 As shown, it can be seen that Example 27 as a comparative example does not satisfy formula (6) or formula (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 28 as an embodiment satisfies formula (6) or formula (7) and can suppress the cover glass from peeling off from the frame.

[0306]

Table 9

[0307]

[0308] (Example 29, Example 30)

[0309] Table 9 is a table showing the characteristics of the cover glasses of Examples 29 to 36. Fig.35 It is a graph showing the evaluation results of each cover glass of Example 29 and Example 30.

[0310] In Examples 29 and 30, the thickness of the cover glass was set to 0.7 mm, and the radius of curvature R, the area A2, and the perimeter L were set as shown in Table 9. The same procedures were followed as in Examples 23 and 24.

[0311] As shown in Table 9 and Fig.35 As shown, it can be seen that Example 29 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 30 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0312] (Example 31, Example 32)

[0313] Fig.36 It is a graph showing the evaluation results of each cover glass of Example 31 and Example 32.

[0314] In Examples 31 and 32, a portion of the cover glass is bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A2, and perimeter L are set as shown in Table 9. Other than that, the same procedures as in Examples 29 and 30 are adopted.

[0315] As shown in Table 9 and Fig.36 As shown, it can be seen that Example 31 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 32 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0316] (Example 33, Example 34)

[0317] Fig.37 It is a graph showing the evaluation results of each cover glass of Example 33 and Example 34.

[0318] In Examples 33 and 34, the thickness of the cover glass was set to 0.7 mm, and the radius of curvature R, the area A1, and the perimeter L were set as shown in Table 9. The same procedures as in Examples 21 and 22 were used.

[0319] As shown in Table 9 and Fig.37 As shown, it can be seen that Example 33 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 34 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0320] (Example 35, Example 36)

[0321] Fig.38 It is a graph showing the evaluation results of each cover glass of Example 35 and Example 36.

[0322] In Examples 35 and 36, a portion of the cover glass was bent to form flat portions on both sides of the bent portion, and the radius of curvature R, area A1, and perimeter L were set as shown in Table 9. Other than that, the same procedures were used as in Examples 33 and 34.

[0323] As shown in Table 9 and Fig.38 As shown, it can be seen that Example 35 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 36 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0324]

Table 10

[0325]

[0326] (Example 37, Example 38)

[0327] Table 10 is a table showing the characteristics of the cover glasses of Examples 37 to 40. Fig.39 It is a graph showing the evaluation results of each cover glass of Example 37 and Example 38.

[0328] In Examples 37 and 38, the thickness of the cover glass was set to 0.5 mm, and the radius of curvature R, the area A2, and the perimeter L were set as shown in Table 10. The same procedures were followed as in Examples 23 and 24.

[0329] As shown in Table 10 and Fig.39 As shown, it can be seen that Example 37 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 38 as an embodiment satisfies equation (6) or equation (7) and can prevent the cover glass from peeling off from the frame.

[0330] (Example 39, Example 40)

[0331] Fig.40 It is a graph showing the evaluation results of each cover glass of Example 39 and Example 40.

[0332] In Examples 39 and 40, the thickness of the cover glass was set to 0.5 mm, and the radius of curvature R, the area A1, and the perimeter L were set as shown in Table 10. The same procedures were followed as in Examples 21 and 22.

[0333] As shown in Table 10 and Fig.40 As shown, it can be seen that Example 39 as a comparative example does not satisfy equation (6) or equation (7), resulting in the cover glass peeling off from the frame, and it can be seen that Example 40 as an embodiment satisfies equation (6) or equation (7) and can suppress the cover glass from peeling off from the frame.

[0334] The above describes the embodiments of the present invention, 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 thought of by those skilled in the art, substantially the same constituent elements, and constituent elements within the so-called equivalent scope. Moreover, the above-mentioned constituent elements can be appropriately combined. Moreover, various omissions, substitutions or changes can be made to the constituent elements within the scope of the gist of the above-mentioned embodiments.

[0335] Although the present invention is described in detail with reference to specific embodiments, it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. In addition, this application is based on Japanese patent applications (Special Application 2021-139604) filed on August 30, 2021, and Japanese patent applications (Special Application 2022-072684) filed on April 26, 2022, and their contents are incorporated into this application as a reference.

[0336] Description of Reference Numerals

[0337] 2…vehicle display device; 10…glass product; 12…cover glass; 12A, 12B…main surfaces; 14…frame; 16…adhesive layer; 20…bent portion; A1, A2…area; F…length; R…radius of curvature; R'…corrected radius of curvature; t…thickness.

Claims

1. A glass product, wherein: have: A cover glass having a first main surface and a second main surface; and a frame bonded to the second main surface side of the cover glass via an adhesive layer, The cover glass is provided with a curved portion formed in a shape convex toward the second main surface, The adhesive layer includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test, When R' is set as shown in the following formula (1) and C1 is set as shown in the following formula (2), when C1>0, the curved portion satisfies the following formula (3), and when C1≤0, the curved portion satisfies the following formula (4), R′=R+F(5t-0.4) …(1) <h2 style=";text-align:left;direction:ltr">C1 = 1000 / R′ - 7.76t<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +19.5t-12.7+(1-0.90t<h2 style=";text-align:left;direction:ltr"> 0.5 <h2 style=";text-align:left;direction:ltr"> (A2 / (A1+A2)) …(2) (A1+A2) / L>2.4…(4) here, R is the radius of curvature of the curved portion (mm), F is a length of a flat region in a first direction perpendicular to the bending axis of the curved portion when a flat region is provided adjacent to the cover glass in the first direction. t is the thickness of the cover glass (mm), A1 is the area of ​​the first adhesive layer at the bent portion (mm 2 ), A2 is the area of ​​the second adhesive layer at the bent portion (mm 2 ), E is the Young's modulus of the cover glass (GPa), L refers to the length (mm) of the bent portion in the first direction.

2. The glass product according to claim 1, wherein: The curved portion formed in a shape convex toward the second main surface also satisfies the following formula (6) when C1>0:

3. The glass product according to claim 1 or 2, wherein: The cover glass is further provided with a curved portion formed in a shape convex toward the first main surface, When C2 is set to be represented by the following formula (5), when C2>0, the curved portion formed in a shape convex toward the first main surface satisfies the following formula (6), and when C2≤0, the curved portion formed in a shape convex toward the first main surface satisfies the following formula (7), <h2 style=";text-align:left;direction:ltr">C2 = 1000 / R′ - 4.54t<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +11.37t-7.58+(0.586-0.44t<h2 style=";text-align:left;direction:ltr"> 0.5 <h2 style=";text-align:left;direction:ltr"> (A2 / (A1+A2)) …(5) (A1+A2) / L>2.4 …(7).

4. A glass product, wherein: have: A cover glass having a first main surface and a second main surface; and a frame bonded to the second main surface side of the cover glass via an adhesive layer, The cover glass is provided with a curved portion formed in a shape convex toward the first main surface, The adhesive layer includes at least one of a first adhesive layer having an elastic modulus of 5 MPa or more in a press-in elastic modulus test and a second adhesive layer having an elastic modulus of less than 5 MPa in a press-in elastic modulus test, When R' is set as shown in the following formula (1) and C2 is set as shown in the following formula (5), when C2>0, the curved portion satisfies the following formula (6), and when C2≤0, the curved portion satisfies the following formula (7), R′=R+F(5t-0.4) …(1) <h2 style=";text-align:left;direction:ltr">C2 = 1000 / R′ - 4.54t<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +11.37t-7.58+(0.586-0.44t<h2 style=";text-align:left;direction:ltr"> 0.5 <h2 style=";text-align:left;direction:ltr"> (A2 / (A1+A2)) …(5) (A1+A2) / L>2.4 …(7) here, R is the radius of curvature of the curved portion (mm), F is a length of a flat region in a first direction perpendicular to the bending axis of the curved portion when a flat region is provided adjacent to the cover glass in the first direction. t is the thickness of the cover glass (mm), A1 is the area of ​​the first adhesive layer at the bent portion (mm 2 ), A2 is the area of ​​the second adhesive layer at the bent portion (mm 2 ), E is the Young's modulus of the cover glass (GPa), L refers to the length (mm) of the bent portion in the first direction.

5. The glass product according to any one of claims 1 to 4, wherein: The flat areas are provided on both sides of the bent portion in the first direction.

6. The glass product according to any one of claims 1 to 5, wherein: The (A1+A2) / L is less than 80 mm.

7. The glass product according to any one of claims 1 to 6, wherein: The adhesive layer includes both the first adhesive layer and the second adhesive layer, and the first adhesive layer and the second adhesive layer are composed of different adhesive members.

8. The glass product according to any one of claims 1 to 7, wherein: The cover glass has a thickness t of not less than 0.3 mm and not more than 3.0 mm.

9. The glass product according to any one of claims 1 to 8, wherein: The curvature radius R of the curved portion is greater than or equal to 50 mm and less than or equal to 10000 mm.

10. The glass product according to any one of claims 1 to 9, wherein: The cover glass has a Young's modulus (E) of 60 GPa or more and 90 GPa or less.

11. A vehicle-mounted display device, wherein: have: Display; and The glass product according to any one of claims 1 to 10, which is provided on the surface of the display.

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