Laminated glass for automobiles

Abstract

Wrinkles that form in the functional layer of the interlayer placed between two curved glass plates make it visible This prevents deterioration of appearance. We provide laminated glass for automobiles. [Solution] The laminated glass for automobiles according to the present invention comprises a first glass plate formed in a rectangular shape, a second glass plate formed in a rectangular shape and positioned opposite the first glass plate, an interlayer disposed between the first glass plate and the second glass plate, a functional layer disposed between the first glass plate and the second glass plate, and a shielding layer laminated on the peripheral edge of at least one of the first glass plate and the second glass plate, wherein the functional layer is formed such that at least a part of the outer edge of the functional layer is located outside the inner edge of the shielding layer.

Description

[Technical Field]

[0001] This invention relates to laminated glass for automobiles. [Background technology]

[0002] Laminated automotive glass, used in windshields and the like, is composed of an outer glass plate, an inner glass plate, and an interlayer placed between these glass plates. In recent years, various functions have been added to the interlayer; for example, a functional layer such as a heat-shielding film is placed within the interlayer to suppress the temperature rise caused by light from outside the vehicle (for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2016-64965 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Incidentally, the laminated glass described above is molded into a curved shape that protrudes outwards from the vehicle. To explain in more detail, for example, many windshields have a three-dimensional structure that curves along an axis extending horizontally and also along an axis extending vertically. Therefore, if a flat film functional layer is sandwiched between the two glass plates, there is a risk of wrinkles forming in the functional layer, resulting in an unsightly appearance.

[0005] The present invention was made to solve the above problems and aims to provide laminated glass for automobiles that can prevent poor appearance caused by wrinkles that occur in the functional layer of the interlayer placed between two curved glass plates. [Means for solving the problem]

[0006] Item 1. A first glass plate formed in a rectangular shape, A second glass plate formed in a rectangular shape and arranged opposite to the first glass plate, An intermediate film disposed between the first glass plate and the second glass plate and including a functional layer, A shielding layer laminated on at least one peripheral edge of the first glass plate and the second glass plate, Comprising An automotive laminated glass in which the functional layer is formed such that at least a part of the outer edge of the functional layer is located outside the inner edge of the shielding layer.

[0007] Item 2. The automotive laminated glass according to Item 1, wherein at least a part of the outer edge of the functional layer is the upper side of the automotive laminated glass.

[0008] Item 3. The automotive laminated glass according to Item 1 or 2, wherein, among the outer edges of the functional layer, the part located outside the inner edge of the shielding layer has corners formed in an arc shape.

[0009] Item 4. The functional layer has a projection film for a head-up display device and at least one base film for supporting the projection film, The automotive laminated glass according to any one of Items 1 to 3, wherein a part of the outer edge of the functional layer is formed so as to reach the edge of the automotive laminated glass.

[0010] Item 5. The functional layer has a projection film for a head-up display device and at least one base film for supporting the projection film, The automotive laminated glass according to any one of Items 1 to 3, wherein a part of the outer edge of the functional layer is arranged with a gap from the edge of the automotive laminated glass.

[0011] Item 6. The functional layer has a projection film for a head-up display device and at least one base film for supporting the projection film, The laminated glass for automobiles according to any one of claims 1 to 3, wherein the edge of the projection film is positioned inward from the edge of the base film and is positioned at a distance of 10 mm or more from the edge of the base film.

[0012] Item 7. The second glass panel is positioned on the inside of the vehicle. The functional layer comprises a projection film and at least one substrate film that supports the projection film. The laminated automotive glass according to any one of claims 1 to 3, wherein, when the distance between the base film and the second glass plate is 50 μm or less, the edge of the projection film is positioned inward from the edge of the base film and at least 26.8 mm away from the edge of the base film.

[0013] Item 8. The second glass panel is positioned on the inside of the vehicle. The functional layer has a projection film for a head-up display device. The laminated automotive glass according to any one of items 1 to 3, wherein the visible light transmittance of the second glass plate is greater than the visible light transmittance of the first glass plate.

[0014] Item 9. The automotive laminated glass according to Item 8, wherein the thickness of the second glass plate is greater than the thickness of the first glass plate.

[0015] Item 10. The automotive laminated glass according to item 8 or 9, wherein the visible light transmittance per unit thickness of the second glass plate is greater than the visible light transmittance per unit thickness of the first glass plate.

[0016] Item 11. The automotive laminated glass according to any one of items 8 to 10, wherein the visible light transmittance of the second glass plate is 85% or more.

[0017] Item 12. The second glass panel is positioned on the inside of the vehicle. The functional layer has a projection film for a head-up display device. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the projection film and the second glass plate is smaller than the distance between the projection film and the first glass plate.

[0018] Item 13. The automotive laminated glass according to Item 12, wherein the distance between the projection film and the second glass plate is 0.3 to 100 μm.

[0019] Item 14. The automotive laminated glass according to Item 13, wherein the distance between the projection film and the second glass plate is 20 to 100 μm.

[0020] Item 15. The shielding layer has an opening through which light entering the information acquisition device located on the inside of the vehicle can pass. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the opening and the functional layer is 10 mm or more.

[0021] Item 16. The distance between the functional layer and either of the glass plates is 50 μm or less. The laminated glass for automobiles according to item 15, wherein the distance between the opening and the functional layer is 26.8 mm or more.

[0022] Item 17. The functional layer comprises an optical film, The laminated automotive glass according to claim 15 or 16, wherein the upper edge of the optical film is positioned below the opening.

[0023] Item 18. The functional layer comprises an infrared reflective film, The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the infrared reflective film and the first glass plate is smaller than the distance between the infrared reflective film and the first glass plate.

[0024] Item 19. The automotive laminated glass according to Item 18, wherein the interlayer includes a heat-shielding PVB film.

[0025] Item 20. The automotive laminated glass according to any one of items 1 to 19, wherein the thickness of the interlayer is 0.3 to 400 μm.

[0026] Item 21. The interlayer is, The aforementioned functional layer, At least one adhesive layer for bonding the functional layer to at least one of the glass plates, A laminated automotive glass as described in item 1, comprising the features described in item 1.

[0027] Item 22. The interlayer comprises a pair of adhesive layers, The laminated automotive glass according to item 21, wherein the functional layer is disposed between the pair of adhesive layers.

[0028] Item 23. The automotive laminated glass according to any one of items 1, 21, or 22, wherein the functional layer is formed such that at least a portion of the outer edge of the functional layer is located within 10 mm inward from the outer edge of the automotive laminated glass.

[0029] Item 24. The aforementioned laminated glass for automobiles is curved such that the first glass plate side is convex. Laminated automotive glass according to any one of items 1, 21 to 23, wherein the maximum distance between the imaginary line connecting the midpoints of the upper and lower edges of the second glass plate and the second glass plate is 10 mm or more.

[0030] Item 25. The automotive laminated glass according to any one of items 1, 21 to 24, wherein the thickness of the outer edge of the functional layer is 2 mm or less.

[0031] Laminated automotive glass according to any one of items 1, 21 to 25, wherein the functional layer is configured to shrink when heated at 130°C for 30 minutes.

[0032] Item 27. The laminated glass for automobiles is curved such that the first glass plate side is convex. The automotive laminated glass according to any one of paragraphs 1, 21 to 26, which satisfies at least one of the following formulas (1) or (2). r V ×r H ≧r MD ×r TD (1) r V ≧0.9990, and r V ≧r TD (2) However, The midpoint of the upper side of the second glass plate: O The midpoint of the lower side of the second glass plate: P The midpoint of the left side of the second glass plate: Q The midpoint of the right side of the second glass plate: R The length of the curve OP along the first surface of the second glass plate on the side opposite to the first glass plate: L V The length of the straight line OP: I V The length of the curve QR along the first surface of the second glass plate: L H The length of the straight line QR: I H I V / L V :r V I H / L H :r H The winding direction of the roll that feeds out the functional layer: MD direction The direction perpendicular to the winding direction of the roll that feeds out the functional layer: TD direction The thermal shrinkage rate of the functional layer before and after heating at 130 °C for 30 minutes in the MD direction: r MD The thermal shrinkage rate of the functional layer before and after heating at 130 °C for 30 minutes in the TD direction: r TD The MD direction of the functional layer is made to coincide with the direction of the curve QR.

[0033] Paragraph 28. The first glass plate is arranged on the outside of the vehicle, The second glass plate is arranged on the inside of the vehicle, The laminated automotive glass according to any one of claims 1, 21 to 27, wherein the shielding layer is laminated on at least one of the interior surface of the first glass plate and the interior surface of the second glass plate.

[0034] Item 29. The laminated glass for automobiles according to any one of items 1, 21 to 28, wherein the infrared transmittance of the shielding layer is 5% or less.

[0035] Item 30. The automotive laminated glass according to any one of items 1, 21 to 29, wherein the functional layer includes a heat-shielding film.

[0036] Item 31. The automotive laminated glass according to any one of items 1, 21 to 30, wherein the functional layer includes at least one of a heating element or an antenna element.

[0037] Item 32. The head-up display device is configured to project information using light emitted from it. The automotive laminated glass according to any one of claims 1, 21 to 31, wherein the functional layer includes a projection film on which the information is projected.

[0038] Item 33. The laminated automotive glass according to Item 32, wherein the projection film is larger than the display area on which the information is projected.

[0039] Item 34. The laminated automotive glass according to item 32 or 33, wherein the thermal shrinkage rate of the projection film when heated at 130°C for 30 minutes is 4% or less. [Effects of the Invention]

[0040] According to the present invention, it is possible to prevent the appearance from becoming unsightly due to wrinkles that occur in the functional layer of the interlayer placed between two curved glass plates. [Brief explanation of the drawing]

[0041] [Figure 1] This is a plan view showing one embodiment in which the laminated glass for automobiles according to the present invention is applied to a windshield. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3] Figure 1 is a perspective view of the windshield. [Figure 4] This is a cross-sectional view of the windshield in Figure 3, taken along the Y direction. [Figure 5] This is a cross-sectional view of the windshield in Figure 3, taken along the X direction. [Figure 6] This is a plan view showing another example of laminated glass according to the present invention. [Figure 7] Figure 6 is a cross-sectional view along line BB. [Figure 8] This is a logarithmic graph showing the relationship between distance L1 and the double image. [Figure 9] This is a plan view showing another example of laminated glass according to the present invention. [Figure 10] This is a plan view showing another example of laminated glass according to the present invention. [Figure 11] This is a plan view showing another example of laminated glass according to the present invention. [Figure 12] This is a plan view showing another example of laminated glass according to the present invention. [Modes for carrying out the invention]

[0042] First, the configuration of the windshield according to this embodiment will be described using Figures 1 and 2. Figure 1 is a plan view of the windshield according to this embodiment, and Figure 2 is a cross-sectional view of Figure 1. For the sake of explanation, the vertical direction in Figure 1 will be referred to as "up and down," "vertical," or "vertical," and the horizontal direction in Figure 1 will be referred to as "left and right."

[0043] As shown in Figure 1, this windshield is equipped with a horizontally elongated trapezoidal laminated glass 10. This laminated glass 10 has an outer glass plate 11, an inner glass plate 12, and an interlayer 13 placed between them. A shielding layer 4 is laminated on the peripheral edge of the inner surface of the inner glass plate 12 that faces the vehicle, thereby shielding the view from outside the vehicle. Each component will be described in detail below.

[0044] <1. Laminated glass> <1-1. Glass plate> First, the outer glass plate 11 and the inner glass plate 12 will be explained. The outer glass plate 11 and the inner glass plate 12 can be made of known glass plates, and can be formed of heat-absorbing glass, general clear glass or green glass, or UV green glass. However, these glass plates 11 and 12 must achieve a visible light transmittance that complies with the safety standards of the country in which the automobile will be used. For example, the outer glass plate 11 can be used to ensure the required solar absorptance, and the inner glass plate 12 can be used to adjust the visible light transmittance to meet the safety standards. Examples of clear glass, heat-absorbing glass, and soda-lime glass are shown below.

[0045] (Clear glass) SiO2:70~73% by mass Al2O3:0.6~2.4% by mass CaO: 7~12% by mass MgO: 1.0~4.5% by mass R2O: 13-15% by mass (R is an alkali metal) Total iron oxide (T-Fe2O3) converted to Fe2O3: 0.08~0.14% by mass

[0046] (Heat-absorbing glass) The composition of heat-absorbing glass can be, for example, based on the composition of clear glass, with a ratio of total iron oxide (T-Fe2O3) converted to Fe2O3 of 0.4 to 1.3 mass%, a ratio of CeO2 of 0 to 2 mass%, a ratio of TiO2 of 0 to 0.5 mass%, and a reduction in the glass skeleton components (mainly SiO2 and Al2O3) by the amount of increase in T-Fe2O3, CeO2, and TiO2.

[0047] (Soda-lime glass) SiO2: 65~80% by mass Al2O3: 0~5% by mass CaO: 5~15% by mass MgO: 2% by mass or more NaO: 10~18% by mass K2O: 0~5% by mass MgO+CaO: 5~15% by mass Na2O+K2O: 10~20% by mass SO3:0.05~0.3% by mass B2O3:0~5% by mass Total iron oxide (T-Fe2O3) converted to Fe2O3: 0.02~0.03% by mass

[0048] The thickness of the laminated glass 10 according to this embodiment is not particularly limited, but the sum of the thicknesses of the outer glass plate 11 and the inner glass plate 12 can be, for example, 2.1 to 6 mm. From the viewpoint of weight reduction, it is preferable that the sum of the thicknesses of the outer glass plate 11 and the inner glass plate 12 be 2.4 to 3.8 mm, more preferably 2.6 to 3.4 mm, and particularly preferably 2.7 to 3.2 mm.

[0049] The outer glass plate 11 primarily needs to be durable and impact-resistant against external damage, and as a car windshield, it needs to be impact-resistant against flying objects such as pebbles. On the other hand, a greater thickness increases weight, which is undesirable. From this viewpoint, the thickness of the outer glass plate 11 is preferably 1.8 to 2.3 mm, and more preferably 1.9 to 2.1 mm. The choice of thickness can be determined according to the application of the glass.

[0050] The thickness of the inner glass plate 12 can be the same as that of the outer glass plate 11, but for example, to reduce the weight of the laminated glass 10, its thickness can be made smaller than that of the outer glass plate 11. Specifically, considering the strength of the glass, a thickness of 0.6 to 2.0 mm is preferable, 0.8 to 1.6 mm is preferable, and 1.0 to 1.4 mm is particularly preferable. Furthermore, 0.8 to 1.3 mm is preferable. The thickness of the inner glass plate 12 can also be determined according to the application of the glass.

[0051] Furthermore, as will be detailed later, this laminated glass 10 is curved so as to protrude outwards from the vehicle. In this case, the thickness is measured at two points, above and below the center line (curve OP, described later) that extends vertically through the center of the laminated glass 10 in the left-right direction. The measuring instrument is not particularly limited, but for example, a thickness gauge such as the SM-112 manufactured by Teclock Co., Ltd. can be used. When measuring, the curved surface of the laminated glass 10 is placed on a flat surface, and the edge of the laminated glass 1 is clamped with the thickness gauge and measured.

[0052] <1-2. Interlayer> As shown in Figure 2, the interlayer 13 comprises a transparent first adhesive layer 131 that is bonded to the outer glass plate 11, a transparent second adhesive layer 132 that is bonded to the inner glass plate 12, and a transparent functional layer 133 that is positioned between these two adhesive layers 131 and 132.

[0053] The first adhesive layer 131 and the second adhesive layer 132 are not particularly limited as long as they are bonded to each glass plate 11, 12 by fusion, but can be formed from, for example, polyvinyl butyral resin (PVB) or ethylene vinyl acetate resin (EVA). Generally, the hardness of polyvinyl acetal resin can be controlled by (a) the degree of polymerization of the starting material, polyvinyl alcohol, (b) the degree of acetalization, (c) the type of plasticizer, and (d) the proportion of plasticizer added.

[0054] The first adhesive layer 131 and the second adhesive layer 132, before being bonded to each glass plate 11 and 12, may be embossed on their surfaces to facilitate the expulsion of air when bonding to the functional layer 133 or to each glass plate 11 and 12.

[0055] The thickness of the first adhesive layer 131 and the second adhesive layer 132 is not particularly limited, but is preferably 20 μm to 2.0 mm, more preferably 20 μm to 1.0 mm, and particularly preferably 50 to 100 μm. However, the thicknesses of both adhesive layers 131 and 132 may be the same or different. Furthermore, if an emboss is formed on each adhesive layer 131 and 132, it is preferable to set the thickness to 20 μm or more, taking into account the depth of the emboss, as described above. Alternatively, instead of using a sheet-like adhesive layer, the adhesive layers 131 and 132 can be formed by coating. In this case, a thin adhesive layer of 0.3 to 100 μm can be formed.

[0056] Furthermore, it is preferable that the combined thickness of both adhesive layers 131 and 132 be 0.76 mm or more. This is to ensure, for example, penetration resistance and other performance characteristics specified in JIS R3211 and R3212 for the windshield.

[0057] Depending on the application, various functional films can be used for the functional layer 133. For example, known heat-shielding films, heat-generating films, projection films, light-emitting films, antenna films, etc., can be used.

[0058] To suppress the rise in temperature inside the vehicle, the heat-shielding film can employ a known infrared-reflective film that reflects infrared rays, or a film configured to absorb infrared rays. It is preferable that such a heat-shielding film be positioned on the outer glass plate 11 side in the thickness direction of the interlayer 13. That is, the first adhesive layer 131 should be thinner than the second adhesive layer 132. In this way, infrared rays can be absorbed at a position further away from the inside of the vehicle in the laminated glass. In addition to using a heat-shielding film for the functional layer 133, to provide a heat-shielding function, for example, at least one of the first adhesive layer 131 and the second adhesive layer 132 can be formed of heat-shielding PVB.

[0059] The heating film is used to remove condensation or de-icing, and can consist of multiple thin wires that generate heat when a voltage is applied, supported by a base film. The base film can be any transparent film, and its material is not particularly limited, but it can be made from, for example, polyethylene terephthalate, polyethylene, polymethyl methacrylate, polyvinyl chloride, polyester, polyolefin, polycarbonate, polystyrene, polypropylene, nylon, etc.

[0060] The projection film is onto which information is projected by light emitted from a head-up display device (hereinafter referred to as HUD). The projection film is not particularly limited as long as it is a film that reflects light and has a different refractive index from the two adhesive layers 131 and 132, for example, a film whose polarization can be controlled, such as a p-polarized reflective film, a hologram film, a transparent screen with a scattering reflective system, a transparent screen with a scattering transmission system, a dimmable film with a scattering reflective system, a dimmable film with a scattering transmission system, or an enhanced reflective film for HUDs. The size of the projection film is not particularly limited, but it is preferably larger than the area on which the information is projected. The projection film may also be supported by a base film. The base film can be the same as the one used for the heat-generating film described above. The projection film may also be the same size as the base film, or it may be smaller than the base film. In this case, it is preferable that the outer edge of the projection film is located inward from the outer edge of the base film.

[0061] Furthermore, the base film can be placed on either the outer glass plate side or the inner glass plate side of the projection film. Alternatively, the projection film can be sandwiched between two base films.

[0062] The light-emitting film has built-in LEDs or similar devices that emit light to display predetermined characters, shapes, or other designs.

[0063] Antenna films, like heating films, are films on which antennas for FM, AM, DTV, DAB, etc., are arranged on the aforementioned base film.

[0064] The above is an example of functional layer 133, and is not limited to these examples.

[0065] The thickness of the film constituting the functional layer 133 described above is not particularly limited, but is preferably 0.01 to 2.0 mm, and more preferably 0.03 to 0.6 mm. Thus, the upper limit of the thickness of the peripheral edge of the film is preferably 2.0 mm. This is because if the thickness of the edge of the film is large, the functional layer 133 will be smaller than both adhesive layers 131 and 132, causing a step in the interlayer 13. This step may cause air to be trapped and bubbles to form when the interlayer 13 is sandwiched between the two glass plates 11 and 12.

[0066] The functional layer 133 preferably shrinks moderately when heated during bonding to prevent wrinkle formation. However, the thermal shrinkage rate of the functional layer 133 is preferably small, for example, 4% or less when heated at 130°C for 30 minutes. In particular, when a projection film is used as the functional layer 133, it is preferable that the thermal shrinkage rate be 1% or less when heated at 130°C for 30 minutes. This is because if the thermal shrinkage rate is too large, for example, image distortion may occur. The thermal shrinkage rate can be measured as follows. First, marks are made on the film having the functional layer 133 at 500 mm intervals, and this film is placed on the substrate without being fixed, and held in an electric furnace heated to 130°C for 30 minutes. The thermal shrinkage rate is calculated by measuring the distance between the marks.

[0067] Furthermore, although the thermal shrinkage rate of the functional layer 133 described above is that before the windshield is manufactured, it is preferable that the functional layer 133 obtained by disassembling the windshield also shrinks under the above conditions, as will be described later.

[0068] The thickness of each adhesive layer 131, 132 and functional layer 133 can be measured, for example, as follows. First, the cross-section of the windshield is magnified 175 times using a microscope (for example, a VH-5500 manufactured by Keyence Corporation). Then, the thickness of each adhesive layer 131, 132 and functional layer 133 is identified visually and measured. In this case, to eliminate visual variation, the measurement is taken five times, and the average value is taken as the thickness of each adhesive layer 131, 132 and functional layer 133.

[0069] The size of each adhesive layer 131 and 132 is the same as that of the outer glass plate 11 and the inner glass plate 12, but the size of the functional layer 133 is smaller than both adhesive layers 131 and 132. Specifically, the periphery of the functional layer 133 is located inward from the periphery of each glass plate 11 and 12. For example, it is preferable that the periphery of the functional layer 133 be located 5 mm or more inward from the periphery of each glass plate 11 and 12, and more preferably 10 mm or more inward. This is to prevent moisture from entering from the edge of the interlayer 13 if wrinkles form on the edge of the functional layer 133, as will be described later.

[0070] <2. Shielding layer> As shown in Figure 1, a shielding layer 4 is laminated on the periphery of this windshield, consisting of a dark-colored ceramic such as black. This shielding layer 4 blocks the view from both inside and outside the vehicle, and is laminated along the four sides of the windshield, so as to cover the periphery of the functional layer 133. Therefore, as will be described later, the periphery of the functional layer 133, which is prone to wrinkles, can be hidden by the shielding layer 4, making this part invisible from inside or outside the vehicle.

[0071] As described above, the shielding layer 4 can be laminated only on the inner surface of the inner glass plate 12, or in various other configurations, such as only on the inner surface of the outer glass plate 11, or on the inner surfaces of both the outer glass plate 11 and the inner glass plate 12. It can also be formed from ceramics or various other materials, but for example, it can have the following composition.

[0072] [Table 1] *1, Main components: copper oxide, chromium oxide, iron oxide, and manganese oxide *2, Main components: Bismuth borosilicate, zinc borosilicate

[0073] Ceramics can be formed by screen printing, but they can also be produced by transferring a firing transfer film onto a glass plate and firing it. When using screen printing, for example, a polyester screen with 355 mesh, a coating thickness of 20 μm, a tension of 20 Nm, a squeegee hardness of 80 degrees, a mounting angle of 75°, and a printing speed of 300 mm / s can be used, and the ceramic can be formed by drying in a drying oven at 150°C for 10 minutes.

[0074] In addition to laminating ceramics, the shielding layer 4 can also be formed by attaching a dark-colored resin shielding film.

[0075] <3. Relationship between glass plate curvature and interlayer> As described above, the windshield according to this embodiment is curved so as to be convex on the outside of the vehicle. Here, we will consider the relationship between the curvature of the glass plate and the interlayer. First, as shown in Figures 3 to 5, the dimensions and physical properties of the windshield are defined as follows. Note that Figure 3 is a perspective view of the windshield according to this embodiment, Figure 4 is a cross-sectional view of Figure 3 along line OP, and Figure 5 is a cross-sectional view of Figure 3 along line QR.

[0076] Midpoint of the upper edge of the inner glass plate: O Midpoint of the lower edge of the inner glass plate: P Midpoint of the left side of the inner glass plate: Q Midpoint of the right-hand side of the inner glass plate: R Length of the curve OP along the inner surface (first surface) of the inner glass panel: L V Length of straight line OP: I V Length of the curve QR along the first surface of the inner glass plate: L H Length of straight line QR: I H I V / L V :r V I H / L H :r H Winding direction of the roll that unwinds the functional layer: MD direction The direction perpendicular to the winding direction of the roll that unwinds the functional layer: TD direction Thermal shrinkage rate of the functional layer before and after heating at 130°C for 30 minutes in the MD direction: r MD Thermal shrinkage rate of the functional layer before and after heating at 130°C for 30 minutes in the TD direction: r TD

[0077] As shown in Figure 3, this windshield has a curved vertical line (Y-axis) connecting points O and P, and a curved horizontal line (X-axis) connecting points Q and R. In other words, this windshield has a three-dimensional structure. Hereinafter, the maximum distance between the straight line OP and the inner surface of the inner glass plate 12 will be referred to as the overlap amount d, and the maximum distance between the straight line QR and the inner surface of the inner glass plate 12 will be referred to as the bending depth y. In the windshield targeted by this embodiment, both the overlap amount d and the bending depth y, which are degrees of curvature, are 10 mm or more, and as a result, as will be explained below, wrinkles are likely to form in the functional layer 133.

[0078] As will be described later, the interlayer 13 is placed between the outer glass plate 11 and the inner glass plate 121, and fixed between the two glass plates 11 and 12 after heat and pressure are applied. At this time, mainly the adhesive layers 131 and 132 melt, but the functional layer 133 does not melt. Also, since the two glass plates 11 and 12 are curved in both the horizontal and vertical directions, if a flat interlayer 13 is placed between the two glass plates 11 and 12 and bonded, wrinkles may form around the periphery of the functional layer 133. Therefore, in this embodiment, we have considered how to minimize the formation of wrinkles around the periphery of the functional layer 133.

[0079] In the above definition, r V ,r H The present inventors define the degree of curvature r of the windshield, which indicates the degree of curvature in each axial direction, with a larger value indicating a flatter surface. In this embodiment, the flat functional layer 133 is placed between two three-dimensionally curved glass plates 11 and 12 as described above, but it shrinks due to the heat acting during manufacturing. Therefore, even if wrinkles like those described above occur, it is thought that the wrinkles will disappear or be reduced due to thermal shrinkage under the conditions described later. The present inventors define the degree of curvature r V ,r H and thermal contraction coefficient r MD ,r TD When comparing the two, the degree of curvature r V ,r H However, it was found that wrinkles hardly occur when the thermal shrinkage rate is greater than that.

[0080] In this embodiment, the interlayer 13 is positioned between the two glass plates 11 and 12 such that the MD direction coincides with the longitudinal direction of the windshield, i.e., the horizontal direction. The inventors have found that wrinkles do not occur when the following equation (1), which considers both curvature in the X-axis and Y-axis directions, is satisfied. That is, if the degree of curvature of the windshield is greater than the degree of thermal contraction of the functional layer 133, the thermal contraction of the functional layer 133 causes the excess functional layer portion that does not conform to the curved surface to shrink, so the functional layer 133 conforms to the curve, making it less likely for wrinkles to occur. r V ×r H ≧r MD ×r TD (1)

[0081] Furthermore, the degree of curvature in the shorter direction is small, that is, r VIf the curvature is sufficiently large, wrinkles caused by curvature in the short direction can be ignored. That is, when placing the interlayer 13 between the outer glass plate 11 and the inner glass 12, wrinkles in the functional layer 133 caused by curvature in the long direction can be suppressed. Also, because the degree of curvature in the short direction is small, the effect of wrinkles in the functional layer 133 caused by curvature in the short direction is small. Therefore, similar to wrapping a flat sheet around a cylindrical object, the interlayer 13 can be placed between the two glass plates 11 and 12 in such a way that wrinkles in the functional layer 133 are minimized.

[0082] Furthermore, when bonding the two glass plates 11 and 12 to the interlayer 13, the functional layer 133 is r V ≧r TD If this condition is met, the thermal shrinkage of the functional layer 133 causes the excess functional layer portion in the shorter direction to shrink, allowing the functional layer 133 to conform to the curve. This makes it possible to position the functional layer 133 while suppressing the formation of wrinkles. From the above, the inventors have found that when the interlayer film 13 is bonded, if the following equation (2) is satisfied, no wrinkles will form, or only negligible wrinkles will form. r V ≥0.9990, and r V ≧r TD (2)

[0083] As described above, in order to suppress the occurrence of wrinkles in the functional layer 133, it is preferable to configure the laminated glass 10 so as to satisfy at least one of formulas (1) and (2), and if both formulas (1) and (2) are satisfied, the occurrence of wrinkles can be further suppressed.

[0084] <4. Method for manufacturing a windshield> Next, we will describe an example of a method for manufacturing a windshield configured as described above. First, we will describe the method for manufacturing laminated glass 1.

[0085] First, the shielding layer 4 described above is laminated onto at least one of the flat outer glass plate 11 and the inner glass plate 12. Next, these glass plates 11 and 12 are shaped to be curved. The shaping method is not particularly limited, and known methods can be used. For example, the flat glass plates can be shaped into a curved form by passing them through a heating furnace and then pressing them with an upper and lower die. Alternatively, the flat outer glass plate and the inner glass plate can be stacked, placed on a frame-shaped mold, and passed through a heating furnace. This softens both glass plates, and they are shaped into a curved form by their own weight.

[0086] Once the outer glass plate 11 and the inner glass plate 12 are formed into a curved shape, the interlayer 13 is then sandwiched between the outer glass plate 11 and the inner glass plate 12, placed in a rubber bag, and pre-bonded at approximately 70-110°C under reduced pressure suction. The interlayer 13 may, for example, consist of a functional layer 133 sandwiched between adhesive layers 131 and 132. Other pre-bonding methods are also possible. For example, the interlayer 13 is sandwiched between the outer glass plate 11 and the inner glass plate 12 and heated in an oven at 45-65°C. Subsequently, this laminated glass is pressed with a roller at 0.45-0.55 MPa. Next, this laminated glass is heated again in an oven at 80-105°C, and then pressed again with a roller at 0.45-0.55 MPa. Thus, pre-bonding is completed.

[0087] Next, the final bonding is performed. The pre-bonded laminated glass is then bonded in an autoclave, for example, at 8 to 15 atmospheres and 100 to 150°C. Specifically, for example, the final bonding can be performed at 14 atmospheres and 145°C. In this way, the laminated glass 1 according to this embodiment is manufactured.

[0088] <5. Features> According to the windshield described above, the following effects can be obtained. (1) When a flat interlayer 13 is sandwiched between two curved glass plates 11 and 12, wrinkles may form around the periphery of the functional layer 133 within the interlayer 13. However, since the periphery of the functional layer 133 is hidden by the shielding layer 4, even if wrinkles occur, they can be prevented from being seen from inside or outside the vehicle. Therefore, the appearance of the windshield can be improved.

[0089] (2) The outer edge of the functional layer 133 is positioned inward from the edge of the laminated glass 10 so as not to be exposed to the outside from both glass plates 11 and 12. Therefore, at the edge of the laminated glass 10, the portion exposed from both glass plates 11 and 12 is protected by the adhesive layers 131 and 132, preventing water from entering.

[0090] (3) The occurrence of wrinkles can be suppressed by satisfying at least one of the above formula (1) or formula (2).

[0091] <6. Variation> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention. The following modifications can be combined as appropriate.

[0092] <6-1> In the above embodiment, the entire outer edge of the functional layer 133 is positioned inside the inner edge of the shielding layer 4. However, since wrinkles may not occur along the entire outer edge of the functional layer 133, a portion of the outer edge of the functional layer 133 may be positioned outside the inner edge of the shielding layer 4, rather than the entire outer edge. However, it is preferable that the portion of the outer edge of the functional layer 133 facing the upper edge of the laminated glass 10 is positioned outside the inner edge of the shielding layer 4. This is because rainwater may penetrate the upper edge of the laminated glass 10, and it is preferable to conceal this portion with the shielding layer 4.

[0093] Furthermore, for example, if a projection film for the HUD is used as the functional layer, the projection film 133 can be provided at the lower end of the laminated glass, as shown in Figure 6. In this case, since the projection film 133 is formed in a rectangular shape, the right and bottom edges of the projection film 133 can be hidden by the shielding layer 4. Also, in the portion exposed from the shielding layer 4, for example, if the corner 136 where the top and bottom edges intersect is made into an arc shape, it can be made difficult to see.

[0094] When using the projection film 133, it is preferable to make the visible light transmittance of the inner glass plate 12, as defined by JIS R3106:1998, greater than that of the outer glass plate 11, in order to make the information projected from the HUD easier to see. It is also possible to make the visible light transmittance per unit thickness of the inner glass plate 12 greater than that of the outer glass plate 11. Furthermore, it is preferable to make the thickness of the inner glass plate 12 smaller than that of the outer glass plate 11. The visible light transmittance of the inner glass plate 12 is preferably, for example, 85% or higher.

[0095] Furthermore, it is preferable that the projection film 133 be positioned on the inner glass plate 12 side in the thickness direction of the interlayer 13. That is, the second adhesive layer 132 should be thinner than the first adhesive layer 131. This shortens the light path from the HUD, making double images less likely to occur. In this case, the distance between the projection film 133 and the inner glass plate 12, i.e., the thickness of the second adhesive layer 132, is preferably 0.3 to 100 μm, and more preferably 5 to 100 μm. Also, when the second adhesive layer 132 is made thinner, for example, the inner glass plate 12 side surface of the projection film 133 can be coated with the material that constitutes the second adhesive layer 132, for example, PVB. This makes it possible to reduce the thickness of the second adhesive 132, i.e., the distance between the projection film 133 and the inner glass plate 12, to about 0.3 μm.

[0096] The projection film 133 can be used alone as a functional layer, but for example, as shown in Figure 7, the projection film 133 can be placed on the base film 138 and positioned between the two adhesive layers 131 and 132. In this example, the projection film 133 is formed smaller than the base film 138.

[0097] Incidentally, when a functional layer including such a projection film 133 and a base film 138 is placed inside the laminated glass 10, a step is created in the interlayer 13 by the outer edge of the functional layer 133, which can cause the laminated glass 10 to bulge in the thickness direction and potentially produce a double image larger than the reference value. In particular, the inventors have confirmed that distortion occurs in the laminated glass within a predetermined range in the planar direction from the outer edge of the functional layer, i.e., the outer edge of the base film, and this can cause a double image larger than the reference value. The range in which the double image occurs is as shown in Figure 7, on both the edge side of the laminated glass (X2 side) and the side on the opposite side where the base film is located (X1 side), i.e., from the outer edge Q of the base film 138. Therefore, it is preferable to place the projection film 133, from which light is projected from the HUD, at a distance from the outer edge of the base film 138 to a position where a double image larger than the reference value does not occur. In other words, as confirmed by Test 2 described later, it is preferable to set the distance L1 between the outer edge of the projection film 133 and the outer edge of the base film to 10 mm or more, and it has been confirmed that this suppresses double images in the image projected onto the projection film.

[0098] In particular, the inventors have confirmed through the following Test 1 that when the distance d between the functional layer (projection film 133) and the inner glass plate 12 is 50 μm or less, setting the distance L1 to 26.8 mm or more suppresses the double image on the projection film 133. Furthermore, when the distance d between the functional layer 133 and the inner glass plate 12 is 30 μm or less, and even 25 μm or less, it is particularly preferable to set the distance L1 to 26.8 mm or more. The distances verified in the above description are based on the knowledge regarding the double image that occurs on the X1 side as described above, but the inventors have confirmed that the same applies to the double image that occurs on the X2 side, i.e., in the direction away from the functional layer 133.

[0099] Test 1 will now be described. Specifically, as shown in Figure 7, a first adhesive layer 131, a projection film 133 with a thickness of 101 μm, and a second adhesive layer 132 were arranged in this order between an outer glass plate 1 with sides of 300 mm and a thickness of 2 mm and an inner glass plate 2. At this time, the thickness of the interlayer 13 was 0.76 mm, and the distance from the projection film 133 to the inner glass plate 12 (approximately the thickness of the second adhesive layer 132) was 25 μm. The projection film 133 was 252 mm × 268 mm in size, smaller than the base film 138, and a distance L1 was left between the outer edge of the base film 138 and the outer edge of the projection film 133. In this laminated glass, the position of the projection film 133 on the base film 138 was changed, and the distance L1 was varied while measuring the double image in accordance with JIS R3211 / R3212. Specifically, the double image was measured at the outer edge P of the projection film 133 when the distance L1 was 21 mm, 71 mm, and 121 mm. The results are shown in Figure 8.

[0100] Figure 8 is a logarithmic graph showing three measurement points and their approximation curves. From these approximation curves, it was found that the standard L1 defined in the JIS standard, which is the distance at which a double image is considered to be 25 minutes or less, is 26.8 mm. In other words, it was found that if the distance L1 from the outer edge of the base film 138 to the outer edge of the projection film 133 is 26.8 mm or more, a double image larger than the standard value will not be generated on the projection film 133.

[0101] Furthermore, Test 2 was also conducted. In Test 2, the double image was measured using the method described above while varying the position of the projection film 133 in laminated glass with the three types of projection films 133 shown in Table 2. The outer glass plate 11 and the inner glass plate 12 had sides of 300 mm and a thickness of 2 mm each. The thickness of the interlayer film 13 was 0.76 mm. Note that the film 2 shown in Table 2 below is the same projection film used in Test 1 above. [Table 2]

[0102] As shown in Table 2, films 1 and 2 are positioned near the inner glass plate in the thickness direction of the interlayer. On the other hand, film 3 is positioned near the center in the thickness direction of the interlayer. The double image measurement results are as follows. [Table 3]

[0103] Since the baseline value for double images is 25 minutes or less, the results for films 1 and 2 above show that when the projection film 133 is placed near the inner glass plate 12, as in the results for Figure 8, setting the distance L1 to 26.8 mm or more prevents the occurrence of double images larger than the baseline value on the projection film 133. On the other hand, when the projection film 133 is placed near the center in the thickness direction of the interlayer 13, as in film 3, setting the distance L1 to 10 mm or more prevents the occurrence of double images larger than the baseline value on the projection film 133.

[0104] By the way, in the example shown in Figure 6 above, all sides of the functional layer 13 (base film 138) are located inside the laminated glass 10. However, as shown in Figure 9, for example, a portion of the outer edge of the functional layer 13 can reach the edge of the laminated glass 10. In this case, a portion of the outer edge of the functional layer 13 is exposed to the outside from between the outer glass plate 11 and the inner glass plate 12. This makes it less likely for the bulge caused by the step described above to occur, thus suppressing the occurrence of a double image on the projection film 133. However, there is a risk of water seeping in from the exposed edge of the functional layer 13. On the other hand, as shown in Figure 6, the outer edge of the functional layer 13 is protected by the adhesive layers 131 and 132 and is not exposed to the outside from between the two glass plates 11 and 12, thus preventing water from seeping in. Note that the shape of the base film 138 and the projection film 133 is not particularly limited and may be other than rectangular.

[0105] <6-2> The configuration of the shielding layer 4 is not particularly limited. As described above, it can be arranged along the periphery of each glass plate, and as shown in Figure 10, an extended portion 42 for an in-vehicle camera (information acquisition device) can also be provided. A camera window (opening) 421 is formed in this extended portion 42, allowing for photography of the outside of the vehicle. Furthermore, this extended portion 42 can also conceal the bracket supporting the camera from outside the vehicle. In addition to providing such an extended portion, the shielding layer according to the present invention can have various shapes. The shape of the camera window 421 is also not particularly limited. As shown in Figure 9, it can have a closed periphery, or a shape in which a part is open from the end of the extended portion.

[0106] In addition to the materials mentioned above, various other materials can be used for the shielding layer 4. For example, a material with an infrared transmittance of 5% or less can be used. Using such a material can provide a heat shielding effect at the periphery of the windshield. Furthermore, when a heat shielding film is used for the functional layer 133, the size of the heat shielding film can be reduced. That is, the area of ​​the heat shielding film that is hidden by the shielding layer 4 can be reduced.

[0107] Furthermore, it is preferable that the functional layer 133 is formed so as not to overlap with the imaging window 421, so as not to affect the imaging by the in-vehicle camera. For example, as shown in Figure 11, a through hole 134 can be formed in the functional layer 133 in the portion that overlaps with the imaging window 421. This through hole 134 can be positioned inside the outer edge of the extended portion 42 and can be shaped to surround the imaging window 421. It is also preferable that the distance L2 between this through hole 134 and the imaging window 421 be 10 mm or more. This is because, as described above, the outer edge of the functional layer 133 creates a step inside the interlayer 13, and a double image is generated in a predetermined range in the planar direction from the outer edge of the functional layer 133. In this example, due to the step created by the inner edge of the through hole 134 of the functional layer 133, a double image larger than the reference value may be generated inside this inner edge (the double image on the X2 side described above), so it is preferable that the imaging window 421 be 10 mm or more away from the inner edge of the through hole 134. In particular, when the distance between the functional layer 133 and the outer glass plate 11 or inner glass plate 12 (the thickness of the first adhesive layer 131 or the second adhesive layer 132) is 10 μm or less, it is preferable that the distance L2 is 26.8 mm or more, calculated in the same way as the distance L1 above.

[0108] In addition to forming through holes in the functional layer 133 as described above, a notch 135 can also be formed on the upper edge of the functional layer 133, as shown in Figure 12. The imaging window 421 can then be formed above this notch 135. This notch 135 can be positioned inward from the outer edge of the extended portion 42 and can pass around the imaging window 421. The distance L2 between this notch 135 and the imaging window 421 can be set in the same way as described above.

[0109] Furthermore, the above-mentioned shooting window 421 can be used not only for in-vehicle cameras but also for various other sensors.

[0110] <6-3> In the above embodiment, an example was shown in which the laminated glass for automobiles of the present invention was applied to a windshield, but it can also be applied to rear windows, side windows, etc. [Examples]

[0111] The following describes embodiments of the present invention. However, the present invention is not limited to the following embodiments.

[0112] Windshields according to Examples 1 to 15 and Comparative Examples 1 to 4, manufactured using the method described in the above embodiments, were prepared. The dimensions are as follows. The definitions of the dimensions shown below are as described in the above embodiments. [Table 4]

[0113] The interlayers (materials A to G) used in the windshields of Examples 1 to 15 and Comparative Examples 1 to 4 are all the same, as follows, and consist of two adhesive layers and a functional layer placed between them. • First adhesive layer: Polyvinyl butyral resin (PVB), 380 μm thick • Second adhesive layer: Polyvinyl butyral resin (PVB), 380 μm thick • Functional layer: Three types of heat-reflective films were used as the functional layer. The thermal shrinkage rate r in the MD direction and TD direction of each functional layer MD and r TD The details are as shown in Table 3 below. The size of each functional layer was adjusted so that its outer edge was 10 mm inward from the outer edge of each glass plate. The thickness of each functional layer was 50 μm. [Table 5]

[0114] For Examples 1-15 and Comparative Examples 1-4, the above-mentioned formulas (1) and (2) were examined, and the presence or absence of wrinkles at the periphery of the functional layer was visually observed. The results are as follows. [Table 6]

[0115] As shown in Table 6, Examples 1 to 11 satisfied at least one of formula (1) or (2), and as a result, no wrinkles occurred around the periphery of the functional layer. On the other hand, Comparative Examples 1 to 4 did not satisfy either formula (1) or (2), and as a result, wrinkles occurred around the periphery of the functional layer. [Explanation of symbols]

[0116] 10 Laminated glass 11. Outer glass plate (first glass plate) 12. Inner glass plate (second glass plate) 13 Interlayer 131 1st adhesive layer 132 Second adhesive layer 133 Functional Layers 4 Shielding layer

Claims

1. A first glass plate formed in a rectangular shape, A second glass plate, which is positioned opposite the first glass plate and is formed in a rectangular shape, Displaced between the first glass plate and the second glass plate, an interlayer including a functional layer, A shielding layer laminated on at least one of the peripheral edges of the first glass plate and the second glass plate, Equipped with, Laminated glass for automobiles, wherein the functional layer is formed such that at least a portion of the outer edge of the functional layer is located outside the inner edge of the shielding layer.

2. The laminated glass for automobiles according to claim 1, wherein at least a portion of the outer edge of the functional layer is the upper edge of the laminated glass for automobiles.

3. The laminated glass for automobiles according to claim 1 or 2, wherein the portion of the outer edge of the functional layer that is located inside the inner edge of the shielding layer has an arc-shaped corner.

4. The functional layer comprises a projection film for a head-up display device and at least one substrate film supporting the projection film. The laminated glass for automobiles according to any one of claims 1 to 3, wherein a part of the outer edge of the functional layer is formed to reach the edge of the laminated glass for automobiles.

5. The functional layer comprises a projection film for a head-up display device and at least one substrate film supporting the projection film. The laminated glass for automobiles according to any one of claims 1 to 3, wherein a portion of the outer edge of the functional layer is arranged with a gap between it and the edge of the laminated glass for automobiles.

6. The functional layer comprises a projection film for a head-up display device and at least one substrate film supporting the projection film. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the edge of the projection film is positioned inward from the edge of the base film and is positioned at a distance of 10 mm or more from the edge of the base film.

7. The second glass panel is positioned on the inside of the vehicle. The functional layer comprises a projection film and at least one base film that supports the projection film. The laminated glass for automobiles according to any one of claims 1 to 3, wherein when the distance between the base film and the second glass plate is 50 μm or less, the edge of the projection film is positioned inward from the edge of the base film and at least 26.8 mm away from the edge of the base film.

8. The second glass panel is positioned on the inside of the vehicle. The functional layer has a projection film for a head-up display device. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the visible light transmittance of the second glass plate is greater than the visible light transmittance of the first glass plate.

9. The laminated glass for automobiles according to claim 8, wherein the thickness of the second glass plate is greater than the thickness of the first glass plate.

10. The laminated glass for automobiles according to claim 8 or 9, wherein the visible light transmittance per unit thickness of the second glass plate is greater than the visible light transmittance per unit thickness of the first glass plate.

11. The laminated glass for automobiles according to any one of claims 8 to 10, wherein the visible light transmittance of the second glass plate is 85% or more.

12. The second glass panel is positioned on the inside of the vehicle. The functional layer has a projection film for a head-up display device. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the projection film and the second glass plate is smaller than the distance between the projection film and the first glass plate.

13. The laminated glass for automobiles according to claim 12, wherein the distance between the projection film and the second glass plate is 0.3 to 100 μm.

14. The distance between the projection film and the second glass plate is 20 to 100 μm. Laminated glass for automobiles according to claim 13.

15. The aforementioned shielding layer has an opening formed therein through which light entering the information acquisition device located on the inside of the vehicle can pass. The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the opening and the functional layer is 10 mm or more.

16. The distance between the functional layer and either of the glass plates is 50 μm or less. The laminated glass for automobiles according to claim 15, wherein the distance between the opening and the functional layer is 26.8 mm or more.

17. The functional layer comprises an optical film, The laminated glass for automobiles according to claim 15 or 16, wherein the upper edge of the optical film is positioned below the opening.

18. The functional layer comprises an infrared reflective film, The laminated glass for automobiles according to any one of claims 1 to 3, wherein the distance between the infrared reflective film and the first glass plate is smaller than the distance between the infrared reflective film and the first glass plate.

19. The laminated glass for automobiles according to claim 18, wherein the interlayer includes a heat-shielding PVB film.

20. The laminated glass for automobiles according to any one of claims 1 to 19, wherein the thickness of the interlayer is 0.3 to 400 μm.

21. The aforementioned interlayer film is The aforementioned functional layer, At least one adhesive layer for bonding the functional layer to at least one of the glass plates, The laminated glass for automobiles according to claim 1, comprising the features described above.

22. The interlayer comprises a pair of adhesive layers, The laminated glass for automobiles according to claim 21, wherein the functional layer is disposed between the pair of adhesive layers.

23. The laminated automotive glass according to any one of claims 1, 21, or 22, wherein the functional layer is formed such that at least a portion of the outer edge of the functional layer is located within 10 mm inward from the outer edge of the laminated automotive glass.

24. The aforementioned laminated glass for automobiles is curved such that the first glass plate side is convex. Laminated glass for automobiles according to any one of claims 1, 21 to 23, wherein the maximum distance between the imaginary line connecting the midpoints of the upper and lower edges of the second glass plate and the second glass plate is 10 mm or more.

25. The laminated glass for automobiles according to any one of claims 1, 21 to 24, wherein the thickness of the outer edge of the functional layer is 2 mm or less.

26. The laminated glass for automobiles according to any one of claims 1, 21 to 25, wherein the functional layer is configured to shrink when heated at 130°C for 30 minutes.

27. The aforementioned laminated glass for automobiles is curved such that the first glass plate side is convex. Laminated glass for automobiles according to any one of claims 1, 21 to 26, satisfying at least one of the following formulas (1) or (2). r V ×r H ≧r MD ×r TD (1) r V ≥ 0.9990, and r V ≥r TD (2) however, Midpoint of the upper edge of the second glass plate: O Midpoint of the lower edge of the second glass plate: P Midpoint of the left side of the second glass plate: Q Midpoint of the right-hand side of the second glass plate: R Length L of the curve OP along the first surface of the second glass plate opposite to the first glass plate: V Length of the straight line OP: I V Length of the curve QR along the first surface of the second glass plate: L H Length of the straight line QR: I H I V / L V :r V I H / L H :r H Winding direction of the roll that unwinds the functional layer: MD direction The direction perpendicular to the winding direction of the roll that unwinds the functional layer: TD direction The thermal shrinkage rate of the functional layer before and after heating at 130°C for 30 minutes in the MD direction: r MD The thermal shrinkage rate of the functional layer before and after heating at 130°C for 30 minutes in the TD direction: r TD The MD direction of the functional layer and the direction of the curved QR are to be made to coincide.

28. The first glass panel is positioned on the outside of the vehicle. The second glass panel is positioned on the inside of the vehicle. The laminated glass for automobiles according to any one of claims 1, 21 to 27, wherein the shielding layer is laminated on at least one of the in-vehicle side surface of the first glass plate and the in-vehicle side surface of the second glass plate.

29. The laminated glass for automobiles according to any one of claims 1, 21 to 28, wherein the infrared transmittance of the shielding layer is 5% or less.

30. The laminated glass for automobiles according to any one of claims 1, 21 to 29, wherein the functional layer includes a heat-shielding film.

31. The laminated glass for automobiles according to any one of claims 1, 21 to 30, wherein the functional layer includes at least one of a heating element or an antenna element.

32. The device is configured to project information using light emitted from a head-up display. The laminated glass for automobiles according to any one of claims 1, 21 to 31, wherein the functional layer includes a projection film on which the information is projected.

33. The laminated glass for automobiles according to claim 32, wherein the projection film is larger than the display area on which the information is projected.

34. The laminated glass for automobiles according to claim 32 or 33, wherein the thermal shrinkage rate of the projection film when heated at 130°C for 30 minutes is 4% or less.

Images