Laminated glass, and head-up display system

Abstract

This laminated glass is provided with a first glass plate (11), a second glass plate (12), and an intermediate film (13) which is positioned between the first glass plate (11) and the second glass plate (12) and bonds the first glass plate (11) and the second glass plate (12). The laminated glass has a light control film (14) and polarizing plates (15p, 15s) sealed in the intermediate film (13). In plan view, the area of the light control film (14) is 30% or less of the area of the first glass plate (11), and the polarizing plates (15p, 15s) are disposed between the light control film (14) and the first glass plate (11).

Description

Laminated glass, head-up display systems

[0001] The present invention relates to laminated glass and a head-up display system. This application claims priority to Japanese Patent Application No. 2024-114505, filed on July 18, 2024, the contents of which are incorporated herein by reference.

[0002] In head-up displays (hereinafter also referred to as HUDs), there is a demand for improved visibility of HUD images, and various technologies have been studied to achieve this demand. One example is a technology in which a concealing layer is provided in a part of laminated glass installed in a vehicle and an image is projected onto the concealing layer.

[0003] WO 2024 / 046886 (A)

[0004] However, providing a concealing layer can give the driver or other personnel a feeling of oppression or blockage when no image is being projected. In addition, providing a concealing layer can also cause double or triple images of the HUD, which can worsen visibility.

[0005] The present invention has been made in view of the above points, and has an object to improve the visibility of the HUD image while reducing the sense of oppression or claustrophobia felt by the driver or the like.

[0006] A laminated glass according to one embodiment of the disclosure is a laminated glass comprising a first glass plate, a second glass plate, and an intermediate film positioned between the first glass plate and the second glass plate and bonding the first glass plate to the second glass plate, the laminated glass having a light control film and a polarizing plate encapsulated in the intermediate film, wherein, in a plan view, the area of ​​the light control film is 30% or less of the area of ​​the first glass plate, and the polarizing plate is disposed between the light control film and the first glass plate.

[0007] According to one embodiment of the disclosure, it is possible to improve the visibility of the HUD image while reducing the sense of oppression or claustrophobia felt by the driver or the like.

[0008] FIG. 1 is a schematic diagram illustrating a head-up display system according to the first embodiment. FIG. 2 is a diagram illustrating a laminated glass according to the first embodiment. FIG. 3 is a diagram illustrating a laminated glass according to the first embodiment. FIG. 4 is a cross-sectional view illustrating a laminated glass according to Modification 1 of the first embodiment. FIG. 5 is a cross-sectional view illustrating a laminated glass according to Modification 2 of the first embodiment. FIG. 6 is a cross-sectional view illustrating a laminated glass according to Modification 3 of the first embodiment. FIG. 7 is a cross-sectional view illustrating a laminated glass according to Modification 4 of the first embodiment. FIG. 8 is a cross-sectional view illustrating a laminated glass according to Modification 5 of the first embodiment. FIG. 9 is a diagram illustrating a portion of the configuration and evaluation results of the laminated glasses of Examples 1 to 6. FIG. 10 is a diagram illustrating a portion of the configuration and evaluation results of the laminated glasses of Examples 7 to 12. FIG. 11 is a diagram illustrating a portion of the configuration and evaluation results of the laminated glasses of Examples 13 to 18. FIG. 12 is a diagram illustrating a portion of the configuration and evaluation results of the laminated glasses of Examples 19 to 24. FIG. 13 is a diagram illustrating a portion of the configuration and evaluation results of the laminated glasses of Examples 25 to 28.

[0009] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are designated by the same reference numerals, and duplicate explanations may be omitted. In each drawing, the size and shape may be partially exaggerated to make the contents of the present invention easier to understand.

[0010] The term "vehicle" refers to any moving body capable of mounting laminated glass, including, but not limited to, automobiles, trains, ships, and aircraft.

[0011] Furthermore, a planar view refers to viewing an object from the direction of a normal line passing through the center of gravity of the main surface of the object, and the shape seen in this case is referred to as a planar shape.

[0012] Furthermore, the terms "top" and "bottom" refer to the top and bottom of the laminated glass when it is installed in a vehicle.

[0013] Furthermore, the outermost edge of a given member is referred to as the "periphery," and an area of ​​the given member having a width that is inscribed in the "periphery" is referred to as the "periphery portion."

[0014] First Embodiment [Head-Up Display System] Fig. 1 is a schematic diagram illustrating a head-up display system according to a first embodiment. The HUD system 1 shown in Fig. 1 includes a laminated glass 10 and a light source 50. The HUD system 1 is a head-up display system for a vehicle that displays a virtual image on the vehicle exterior side of the laminated glass 10.

[0015] The laminated glass 10 is, for example, a windshield for a vehicle, and is irradiated with visible light from a light source 50 .

[0016] The light source 50 emits P-polarized, S-polarized, or unpolarized visible light toward the laminated glass 10. The light source 50 includes, for example, a light-emitting unit 51, a first optical system 52, an image display element 53, a second optical system 54, and a concave mirror 55.

[0017] The light-emitting unit 51 is an optical component that emits visible light, such as a light-emitting diode or a laser. The light emitted from the light-emitting unit 51 may be S-polarized, P-polarized, or unpolarized. The light-emitting unit 51 is configured with, for example, three light-emitting elements: a red light-emitting element, a green light-emitting element, and a blue light-emitting element.

[0018] The first optical system 52 is composed of, for example, a prism or lens that combines the multiple light beams emitted from the light-emitting unit 51. The image display element 53 is an element that generates an intermediate image, and is, for example, a liquid crystal display element or an organic light-emitting element. The second optical system 54 is composed of, for example, a lens or a reflecting mirror. The concave mirror 55 is an optical component that reflects the intermediate image with a reflective surface having a predetermined curvature, and is arranged in a position closest to the laminated glass 10 among the optical components arranged on the optical path between the light-emitting unit 51 and the laminated glass 10.

[0019] In the HUD system 1, light emitted from a light-emitting unit 51 passes through a first optical system 52 and reaches an image display element 53, where an intermediate image is formed. The intermediate image formed by the image display element 53 is magnified by passing through a second optical system 54 and a concave mirror 55, and is then projected onto the laminated glass 10. The intermediate image projected onto the laminated glass 10 is reflected by the laminated glass 10 and guided to a viewpoint I of an occupant, who then recognizes the intermediate image as a virtual image V (HUD image) in front of the laminated glass 10. The occupant may be, for example, the driver of the vehicle or a passenger in the front passenger seat.

[0020] In FIG. 1 , θ is the angle of incidence when light emitted from the light source 50 enters the laminated glass 10. When the light entering the laminated glass 10 is P-polarized, the angle of incidence θ is preferably 57° (Brewster's angle), but may be greater or less than 57°. When the light entering the laminated glass 10 is P-polarized visible light, the proportion of P-polarized light is preferably 70% or more, more preferably 80% or more, even more preferably 90% or more, and particularly preferably 100%. When the light entering the laminated glass 10 is S-polarized visible light, the proportion of S-polarized light is preferably 70% or more, more preferably 80% or more, even more preferably 90% or more, and particularly preferably 100%.

[0021] The HUD system 1 may have any configuration as long as it has at least the laminated glass 10 and the light source 50. The configuration of the light source 50 may also be any configuration. The HUD system 1 may be, for example, a laser scanning system in which a laser beam is scanned by an optical scanning unit formed of a MEMS (Micro Electro Mechanical Systems) or the like.

[0022] [Laminated Glass] FIGS. 2A and 2B are diagrams illustrating a laminated glass according to the first embodiment. FIG. 2A is a schematic diagram illustrating the laminated glass as viewed from inside the vehicle to outside the vehicle, and FIG. 2B is a partial cross-sectional view taken along line A-A in FIG. 2A.

[0023] As shown in Figures 2A and 2B, the laminated glass 10 is a laminated glass for a vehicle that includes a first glass plate 11, a second glass plate 12, an interlayer film 13, a light control film 14, a polarizing plate 15p, and a concealing layer 18. The laminated glass 10 can be used, for example, in a vehicle windshield. Note that the laminated glass 10 does not necessarily have to include the concealing layer 18.

[0024] The laminated glass 10 is used in combination with a light source 50 that irradiates the first glass sheet 11 with P-polarized visible light Lp.

[0025] In the laminated glass 10, a first glass sheet 11 and a second glass sheet 12 are bonded together via an interlayer film 13. The first glass sheet 11 is disposed on a first side that faces the interior side of the vehicle when the laminated glass 10 is installed in the vehicle, and the second glass sheet 12 is disposed on a second side that faces the exterior side of the vehicle when the laminated glass 10 is installed in the vehicle.

[0026] The laminated glass 10 may have a complex curved shape, for example, curved in both the vertical and horizontal directions when installed in a vehicle. However, the complex curved shape is not limited to a shape curved in both the vertical and horizontal directions when installed in a vehicle, but includes a shape curved in any two or more different directions. Alternatively, the laminated glass 10 may have a single curved shape curved only in the vertical or horizontal direction when installed in a vehicle. However, the single curved shape is not limited to a shape curved only in the vertical or horizontal direction when installed in a vehicle, but includes a shape curved in any one direction only.

[0027] The laminated glass 10 is preferably curved so as to be convex toward the exterior of the vehicle. That is, the second glass sheet 12 is preferably curved so as to be convex toward the side opposite the interlayer film 13, and the first glass sheet 11 is preferably curved so as to be convex toward the interlayer film 13 side.

[0028] The first glass sheet 11 is an interior glass sheet that faces the interior side (first side) of the vehicle when the laminated glass 10 is installed in the vehicle. The first glass sheet 11 may be curved. The first glass sheet 11 has a fourth surface 11 located on the opposite side from the interlayer film 13. ４ , and the third surface 11 located on the intermediate film 13 side.３ The first glass plate 11 has an upper side, a lower side, and two side sides connecting the upper side and the lower side.

[0029] The second glass sheet 12 is an exterior glass sheet that faces the exterior side (second side) of the vehicle when the laminated glass 10 is installed in the vehicle. The second glass sheet 12 may be curved. The second surface 12 of the second glass sheet 12 is located on the interlayer 13 side. ２ , and a first surface 12 located on the opposite side to the intermediate film 13 １ Similar to the first glass plate 11, the second glass plate 12 has, in plan view, an upper side, a lower side, and two side sides connecting the upper side and the lower side.

[0030] When the laminated glass 10 has a curved shape, the minimum value of the radius of curvature is preferably 500 mm or more and 100,000 mm or less, more preferably 750 mm or more and 75,000 mm or less, and even more preferably 1,000 mm or more and 5,000 mm or less. The radii of curvature of the first glass sheet 11 and the second glass sheet 12 may be the same or different. When the radii of curvature of the first glass sheet 11 and the second glass sheet 12 are different, it is preferable that the radius of curvature of the first glass sheet 11 is smaller than the radius of curvature of the second glass sheet 12.

[0031] The first glass plate 11 and the second glass plate 12 are a pair of glass plates facing each other, and the interlayer film 13 is located between the pair of glass plates. The first glass plate 11 and the second glass plate 12 are fixed together with the interlayer film 13 sandwiched between them. The interlayer film 13 is a film that bonds the first glass plate 11 and the second glass plate 12 together.

[0032] The outer peripheral side surface of the interlayer film 13 is preferably edge-treated. That is, the outer peripheral side surface of the interlayer film 13 is preferably treated so as not to protrude significantly from the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12. If the outer peripheral side surface of the interlayer film 13 protrudes from the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 by an amount of 150 μm or less, this is preferable in terms of not impairing the appearance. Details of the first glass plate 11, the second glass plate 12, and the interlayer film 13 will be described later.

[0033] The light control film 14 is encapsulated in the intermediate film 13. The light control film 14 is a film equipped with a light control element that can switch the transmittance of incident light. When a voltage is supplied to the light control element that constitutes the light control film 14 from a power source such as a battery, the transmittance of the light control element switches according to the voltage. This makes it possible to switch between a non-light-blocking state and a light-blocking state.

[0034] In a plan view, the area of ​​the light control film 14 is 30% or less of the area of ​​the first glass plate 11. When the area of ​​the light control film 14 is 30% or less of the area of ​​the first glass plate 11, the driver's field of vision is not obstructed. The area of ​​the light control film 14 may be 25% or less, 20% or less, or 15% or less of the area of ​​the first glass plate 11. Furthermore, in a plan view, the area of ​​the light control film 14 may be 5% or more, or 10% or more of the area of ​​the first glass plate 11. When the area of ​​the light control film 14 is 5% or more of the area of ​​the first glass plate 11, a sufficient area can be secured as a projection area for the HUD image. In the illustrated example, when the laminated glass 10 is installed in a vehicle, the light control film 14 is provided on the peripheral portion of the lower edge of the laminated glass 10 in a plan view. In plan view, the light control film 14 may be provided over the entire lower peripheral edge of the laminated glass 10, or may be provided over a portion of the lower peripheral edge, or may be divided into two or more locations. In plan view, the light control film 14 has, for example, a rectangular shape.

[0035] The light control film 14 includes a light control element selected from the group consisting of twisted nematic liquid crystal (TN liquid crystal), guest-host liquid crystal (GHLC), polymer-dispersed liquid crystal (PDLC), electrochromic (EC), and suspended particle device (SPD). Among these, TN liquid crystal is particularly preferred because it has a high visible light transmittance in the non-light-shielding state and can achieve a visible light transmittance of almost zero in the light-shielding state. The thickness of the light control film 14 is, for example, preferably 0.1 mm to 0.5 mm, more preferably 0.1 mm to 0.4 mm, and even more preferably 0.15 mm to 0.4 mm. The minimum visible light transmittance of the light control film 14 is preferably 15% or less, more preferably 7% or less, and even more preferably 3% or less, in order to ensure good visibility of the HUD image.

[0036] The polarizing plate 15p is sealed in the intermediate film 13. The polarizing plate 15p is an optical component that transmits S-polarized visible light and blocks P-polarized visible light. The polarizing plate 15p is disposed between the light control film 14 and the first glass plate 11. The thickness of the polarizing plate 15p is, for example, 0.02 mm or more and 0.3 mm or less, preferably 0.05 mm or more and 0.25 mm or less, and more preferably 0.05 mm or more and 0.2 mm or less. Note that "blocking P-polarized visible light" does not only mean completely blocking P-polarized visible light, but also includes blocking 90% or more of it.

[0037] In the illustrated example, the polarizing plate 15p is spaced apart from the light control film 14, and a part of the intermediate film 13 is disposed between the opposing surfaces of the polarizing plate 15p and the light control film 14. The polarizing plate 15p may be in contact with the light control film 14 rather than being spaced apart from it, forming an integrated structure. In this case, the polarizing plate 15p is disposed so as to be in contact with the surface of the light control film 14 facing the interior of the vehicle. When an optical component in which the light control film 14 and the polarizing plate 15p are integrated is used, wrinkles are less likely to occur in the light control film 14 or the polarizing plate 15p than when each is used alone, and therefore optical distortion of the laminated glass 10 can be suppressed.

[0038] The concealing layer 18 is formed on the third surface 11 of the first glass plate 11. ３ , and / or the second surface 12 of the second glass sheet 12 ２ The concealing layer 18 can be provided on the side edge peripheral portion and / or the top edge peripheral portion of the laminated glass 10 in a plan view. The concealing layer 18 may be arranged on the bottom edge peripheral portion of the laminated glass 10 in a position that does not completely overlap with the light control film 14 in a plan view. A portion of the concealing layer 18 may overlap with the light control film 14 in a plan view. For example, by arranging the concealing layer 18 so that it overlaps only the outer edge of the light control film 14, the outer edge of the light control film 14 can be made less noticeable. The area of ​​the concealing layer 18 that overlaps with the light control film 14 in a plan view may be a dot-printed gradation area.

[0039] The width of the concealing layer 18 in a planar view may be set as appropriate. The width of the concealing layer 18 in a planar view, other than the information transmitting / receiving region 19 described below, is, for example, about 10 mm to 350 mm, preferably 20 mm to 300 mm, and more preferably 30 mm to 280 mm.

[0040] The concealing layer 18 is, for example, an opaque colored ceramic layer, and may be any color, but is preferably a dark color such as black, brown, gray, or dark blue, with black being more preferred. The concealing layer 18 can be formed, for example, by applying a ceramic color paste containing a fusible glass frit containing a black pigment onto a glass plate by screen printing or the like, followed by firing, but is not limited to this. The concealing layer 18 may also be formed, for example, by applying an organic ink containing a black or dark color pigment onto a glass plate by screen printing, inkjet printing, or the like, and then drying it.

[0041] The presence of the opaque concealing layer 18 in the laminated glass 10 suppresses deterioration due to ultraviolet rays of the adhesive that holds the bracket for fixing the information transmitting / receiving device to the laminated glass 10 and the adhesive made of a resin such as urethane that holds the peripheral part of the laminated glass 10 to the vehicle body, and also improves the appearance by making the adhesive part invisible from inside and outside the vehicle.

[0042] The laminated glass 10 may have an information transmission / reception area 19. The information transmission / reception area 19 is provided, for example, within an opening in the concealing layer 18 of the laminated glass 10. The information transmission / reception area 19 is provided, for example, on the upper peripheral edge of the laminated glass 10. The information transmission / reception area 19 is an area where, for example, an information device that handles visible light, such as a visible light camera or an illuminance sensor, or an information device that handles infrared light, such as a LiDAR (Light Detection and Ranging) sensor, transmits and / or receives information. In other words, when the laminated glass 10 is installed in a vehicle, the information device can be placed on the interior side of the information transmission / reception area 19.

[0043] A part or all of the area where the light control film 14 and the polarizing plate 15p overlap in a plan view can be used as the HUD display area R. The HUD display area R is an area that can receive light from the light source 50 of the HUD system and displays information by reflecting an image projected from inside the vehicle. The HUD display area R is the range in the eyebox based on SAE J1757-2 (2018) where light from the light source 50 is irradiated onto the laminated glass 10 when the HUD display position is moved.

[0044] The HUD display region R may be divided into a plurality of locations and disposed in the region where the light control film 14 and the polarizing plate 15p overlap in a plan view.

[0045] In this way, with the laminated glass 10, the area that overlaps with the light control film 14 in a planar view can be used as the HUD display area R. When a HUD image is projected onto the HUD display area R, good contrast can be obtained and the visibility of the HUD image can be improved by lowering the transmittance of the light control film 14 that forms the background of the HUD display area R. On the other hand, when a HUD image is not projected, the transmittance of the light control film 14 can be increased so that the driver and others are no longer aware of the presence of the light control film 14, thereby reducing the feeling of oppression or claustrophobia felt by the driver and others.

[0046] Furthermore, in the laminated glass 10, a polarizing plate 15p is disposed between the light control film 14 and the first glass plate 11. This prevents double and triple images from occurring and improves the visibility of the HUD image. This will be explained in detail below.

[0047] If the polarizing plate 15p were not provided, the P-polarized visible light Lp from the light source 50 would be incident on the fourth surface 11. ４ The light is reflected by the second surface 12, and part of the light passes through the first glass plate 11 and the intermediate film 13 to reach the light control film 14, and is also reflected by the surface of the light control film 14 on the vehicle interior side. This causes a double image. Furthermore, if the transmittance of the light control film 14 is not sufficiently low, part of the light that reaches the light control film 14 passes through the light control film 14 and is reflected by the second surface 12. ２ and the second surface 12 ２ In this case, a triple image occurs.

[0048] On the other hand, when the polarizing plate 15p is disposed, the P-polarized visible light Lp is incident on the fourth surface 11 ４ The light is reflected by the polarizing plate 15p, and part of the light passes through the intermediate film 13 and reaches the polarizing plate 15p. However, the polarizing plate 15p blocks P-polarized visible light, so no P-polarized reflected light occurs on the vehicle exterior side of the polarizing plate 15p. ２ Therefore, no P-polarized reflected light is generated, thereby suppressing the occurrence of double and triple images. The above-mentioned effect cannot be achieved if the polarizing plate 15p is disposed only between the light control film 14 and the second glass plate 12. Furthermore, if the visible light transmittance of the polarizing plate 15p and the interlayer film 13 located between the first glass plate 11 and the first glass plate 11 is 50% or less, the visibility of double and triple images can be further suppressed.

[0049] Here, the first glass plate 11, the second glass plate 12, and the interlayer film 13 will be described in detail.

[0050] [Glass Plates] The first glass plate 11 and the second glass plate 12 may be inorganic glass or organic glass. Examples of inorganic glass that can be used include, without particular limitation, soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, and quartz glass. The second glass plate 12 located on the outer side of the laminated glass 10 is preferably inorganic glass from the viewpoint of scratch resistance, and soda-lime glass from the viewpoint of formability. When the first glass plate 11 and the second glass plate 12 are soda-lime glass, clear glass, green glass containing a predetermined amount or more of iron, and dark green glass can be suitably used. Glass that absorbs ultraviolet or infrared rays may also be used. From the viewpoint of preventing deterioration of the light control film 14 due to ultraviolet rays from sunlight, it is preferable that the second glass plate 12 be glass that suppresses transmission of ultraviolet rays. The second glass plate 12 is preferably made of Fe. ２ O ３ The content of TiO is preferably 0.55% by mass or more, more preferably 0.6% by mass or more, and even more preferably 0.7% by mass or more. ２The content of CeO is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more. ２ The content of is preferably 0.1% or more, more preferably 0.2% by mass or more, even more preferably 0.4% by mass or more, and even more preferably 0.6% by mass or more. Furthermore, transparent glass is preferred, but colored glass plates may be used as long as they do not impair transparency. Furthermore, by using borosilicate glass for the second glass plate 12, the strength of the laminated glass 10 against flying stones can be improved.

[0051] The inorganic glass may be either untempered glass or tempered glass. Untempered glass is produced by forming molten glass into a flat plate and slowly cooling it. Tempered glass is produced by forming a compressive stress layer on the surface of untempered glass. In the case of tempered glass, residual stress can be reduced by distributing stress isotropically.

[0052] The tempered glass may be either physically tempered glass such as air-cooled tempered glass or chemically tempered glass. In the case of physically tempered glass, the glass surface can be tempered by generating a compressive stress layer on the glass surface due to the temperature difference between the glass surface and the interior of the glass by an operation other than gradual cooling, such as rapidly cooling a glass sheet uniformly heated during bending from a temperature near its softening point.

[0053] In the case of chemically strengthened glass, for example, after bending, the glass surface can be strengthened by generating compressive stress on the glass surface by an ion exchange method or the like.

[0054] On the other hand, examples of materials for organic glass include transparent resins such as polycarbonate, acrylic resins such as polymethyl methacrylate, polyvinyl chloride, and polystyrene.

[0055] The first glass sheet 11 and the second glass sheet 12 are not limited to a trapezoidal or rectangular shape, and may be processed into various shapes and curvatures. The first glass sheet 11 and the second glass sheet 12 may be bent using a gravity forming method, a press forming method, a roller forming method, or the like. The forming method for the first glass sheet 11 and the second glass sheet 12 is also not particularly limited. For example, in the case of inorganic glass, glass sheets formed by a float method or the like are preferred.

[0056] The thickness of the second glass sheet 12 at its thinnest portion is preferably 1.1 mm or more and 3 mm or less. A thickness of 1.1 mm or more provides sufficient strength, such as resistance to flying stones, while a thickness of 3 mm or less prevents the mass of the laminated glass 10 from becoming too large, which is preferable in terms of vehicle fuel efficiency. The thickness of the second glass sheet 12 at its thinnest portion is more preferably 1.8 mm or more and 2.8 mm or less, even more preferably 1.8 mm or more and 2.6 mm or less, even more preferably 1.8 mm or more and 2.2 mm or less, and even more preferably 1.8 mm or more and 2.1 mm or less.

[0057] The thickness of the first glass plate 11 is preferably 0.3 mm or more and 2.3 mm or less. When the thickness of the first glass plate 11 is 0.3 mm or more, the handling property is good, and when the thickness is 2.3 mm or less, the weight does not become too large.

[0058] Furthermore, if the thickness of the first glass plate 11 is not appropriate, when two sheets of glass with particularly deep curves are formed as the first glass plate 11 and the second glass plate 12, a mismatch will occur in the shapes of the two sheets, which will have a significant impact on the glass quality, such as residual stress after crimping.

[0059] However, by setting the thickness of the first glass sheet 11 to 0.3 mm or more and 2.3 mm or less, glass quality such as residual stress can be maintained. Setting the thickness of the first glass sheet 11 to 0.3 mm or more and 2.3 mm or less is particularly effective in maintaining glass quality in glass with a deep curvature. The thickness of the first glass sheet 11 is more preferably 0.5 mm or more and 2.2 mm or less, and even more preferably 0.7 mm or more and 2.1 mm or less. Within this range, the above-mentioned effects become more pronounced. The thickness of the first glass sheet 11 is more preferably 1.0 mm or more, even more preferably 1.3 mm or more, and even more preferably 1.5 mm or more. Furthermore, the thickness of the first glass sheet 11 is more preferably 2.0 mm or less, and even more preferably 1.9 mm or less.

[0060] The first glass sheet 11 and / or the second glass sheet 12 may not have a constant thickness, but may have a thickness that varies from location to location as necessary. For example, if the laminated glass 10 is a windshield, one or both of the first glass sheet 11 and the second glass sheet 12 may have a wedge-shaped cross section whose thickness increases from the bottom edge to the top edge of the windshield when the windshield is installed in a vehicle. In this case, if the thickness of the interlayer film 13 is constant, the total wedge angle of the first glass sheet 11 and the second glass sheet 12 varies, for example, within a range of more than 0 mrad to 1.0 mrad.

[0061] A coating having water repellency and ultraviolet and infrared blocking properties, or a coating having low reflectivity and low radiation properties may be provided on the outer surface of the first glass plate 11 and / or the second glass plate 12. Furthermore, a coating having ultraviolet and infrared blocking properties, low radiation properties, visible light absorption properties, coloring, etc. may be provided on the side of the first glass plate 11 and / or the second glass plate 12 that contacts the interlayer film 13.

[0062] When the first glass sheet 11 and the second glass sheet 12 are curved inorganic glass, the first glass sheet 11 and the second glass sheet 12 are bent after being formed by a float method or the like and before being bonded with the interlayer film 13. The bending is performed by softening the glass by heating. The heating temperature of the glass during bending is preferably controlled within a range of approximately 550°C to 700°C.

[0063] [Interlayer Film] Thermoplastic resins are often used for the interlayer film 13, and examples thereof include thermoplastic resins that have conventionally been used for this type of application, such as plasticized polyvinyl acetal resins, plasticized polyvinyl chloride resins, saturated polyester resins, plasticized saturated polyester resins, polyurethane resins, plasticized polyurethane resins, ethylene-vinyl acetate copolymer resins, ethylene-ethyl acrylate copolymer resins, cycloolefin polymer resins, and ionomer resins. In addition, resin compositions containing modified hydrogenated block copolymers, as described in Japanese Patent No. 6,065,221, can also be suitably used.

[0064] Among these, plasticized polyvinyl acetal resins are preferably used because they have an excellent balance of properties such as transparency, weather resistance, strength, adhesive strength, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation. These thermoplastic resins may be used alone or in combination of two or more. The term "plasticized" in the plasticized polyvinyl acetal resin means that the resin has been plasticized by adding a plasticizer. The same applies to other plasticized resins.

[0065] However, when a specific substance is encapsulated in the interlayer film 13, the substance may be deteriorated by a specific plasticizer depending on the type of substance to be encapsulated, and in such a case, it is preferable to use a resin that does not substantially contain that plasticizer. Examples of resins that do not contain plasticizers include ethylene-vinyl acetate copolymer (EVA) resins.

[0066] Examples of the polyvinyl acetal resin include polyvinyl formal resin obtained by reacting polyvinyl alcohol (PVA) with formaldehyde, polyvinyl acetal resin in the narrow sense obtained by reacting PVA with acetaldehyde, and polyvinyl butyral (PVB) resin obtained by reacting PVA with n-butylaldehyde. PVB is particularly preferred because it has an excellent balance of properties such as transparency, weather resistance, strength, adhesive strength, penetration resistance, impact energy absorbency, moisture resistance, heat insulation, and sound insulation. These polyvinyl acetal resins may be used alone or in combination of two or more.

[0067] However, the material forming the interlayer 13 is not limited to thermoplastic resin. The interlayer 13 may also contain functional particles such as an infrared absorber, an ultraviolet absorber, or a light-emitting agent. It is preferable to arrange the interlayer 13 containing an ultraviolet absorber on the second glass sheet 12 side (i.e., the vehicle exterior side) of the light control film 14. The interlayer 13 may also have a colored portion called a shade band. The color pigment used to form the colored portion is one that can be used for plastics, and the amount added may be adjusted so that the visible light transmittance of the colored portion is 40% or less. Examples of the color pigment include organic color pigments such as azo-based, phthalocyanine-based, quinacridone-based, perylene-based, perinone-based, dioxazine-based, anthraquinone-based, and isoindolino-based pigments, and inorganic color pigments such as oxides, hydroxides, sulfides, chromates, sulfates, carbonates, silicates, phosphates, arsenates, ferrocyanides, carbon, and metal powders. These color pigments may be used alone or in combination of two or more.

[0068] The interlayer film 13 may have multiple layers. For example, the interlayer film 13 may include three or more layers. For example, if the interlayer film is formed of three or more layers and the shear modulus of any layer other than the two outermost layers is made smaller than the shear modulus of the two outermost layers by adjusting the plasticizer or the like, the sound insulation of the laminated glass 10 can be improved. In this case, the shear modulus of the two outermost layers may be the same or different.

[0069] The thickness of the interlayer film 13 at its thinnest portion is preferably 0.5 mm or more. When the interlayer film 13 has multiple layers, the thickness of the interlayer film 13 is the sum of the thicknesses of the individual layers. When the thickness of the interlayer film 13 at its thinnest portion is 0.5 mm or more, the impact resistance required for laminated glass is sufficient. Furthermore, the thickness of the interlayer film 13 at its thickest portion is preferably 2 mm or less. When the maximum thickness of the interlayer film 13 is 2 mm or less, the mass of the laminated glass does not become too large. The maximum thickness of the interlayer film 13 is more preferably 1.5 mm or less, and even more preferably 1.2 mm or less.

[0070] Furthermore, when the interlayer film 13 has multiple layers, it is desirable that each layer included in the interlayer film 13 be formed of the same material, but they may also be formed of different materials. However, from the viewpoint of adhesion to the first glass sheet 11 and the second glass sheet 12, or functional materials to be incorporated into the laminated glass 10, it is desirable that 50% or more of the thickness of the interlayer film 13 be made of the above-mentioned materials.

[0071] The interlayer film 13 does not have a constant thickness, and its thickness may vary from location to location as necessary. For example, if the laminated glass 10 is a windshield, the interlayer film 13 may have a wedge-shaped cross section whose thickness increases from the bottom edge to the top edge of the windshield when the windshield is installed in a vehicle. In this case, if the thicknesses of the first glass sheet 11 and the second glass sheet 12 are constant, the wedge angle of the interlayer film 13 varies, for example, within a range of more than 0 mrad and not more than 1.0 mrad. The wedge angle of the interlayer film 13 may be 0.1 mrad or more and 0.7 mrad or less, or may be 0.2 mrad or more and 0.5 mrad or less.

[0072] To produce the interlayer film 13, for example, an appropriate resin material for the interlayer film is selected from the above-mentioned materials and extruded in a heated, molten state using an extruder. The extrusion conditions, such as the extrusion speed, of the extruder are set to be uniform. The extruded resin film is then stretched in any direction as necessary to impart curvature to the upper and lower edges in accordance with the design of the laminated glass, thereby completing the interlayer film 13.

[0073] [Laminated Glass] The total thickness of the laminated glass 10 is preferably 2.8 mm or more and 10 mm or less. If the total thickness of the laminated glass 10 is 2.8 mm or more, sufficient rigidity can be ensured. Furthermore, if the total thickness of the laminated glass 10 is 10 mm or less, sufficient transmittance can be obtained and haze can be reduced. The total thickness of the laminated glass 10 is preferably 7 mm or less, more preferably 6 mm or less, and even more preferably 5 mm or less.

[0074] The misalignment between the first glass sheet 11 and the second glass sheet 12 is preferably 1.5 mm or less, and more preferably 1 mm or less, along at least one side of the laminated glass 10. Here, the misalignment between the first glass sheet 11 and the second glass sheet 12 refers to the amount of misalignment between the outer peripheral side surface of the first glass sheet 11 and the outer peripheral side surface of the second glass sheet 12 in a plan view.

[0075] It is preferable that the misalignment between the first glass sheet 11 and the second glass sheet 12 be 1.5 mm or less along at least one side of the laminated glass 10, since it does not impair the appearance. It is even more preferable that the misalignment between the first glass sheet 11 and the second glass sheet 12 be 1.0 mm or less along at least one side of the laminated glass 10, since it does not impair the appearance.

[0076] [Method for manufacturing laminated glass] A method for manufacturing the laminated glass 10 will be exemplified. First, the third surface 11 ３ and fourth surface 11 ４ a first glass plate 11 having the above structure, two or more resin films serving as an intermediate film 13, and a first surface 12 １ and the second surface 12 ２ and a second glass plate 12 having the same thickness. The plate thicknesses of the first glass plate 11 and the second glass plate 12 are constant. The film thicknesses of the two resin films that form the intermediate film 13 are also constant. Note that any one or more of the first glass plate 11, the second glass plate 12, and the two resin films that form the intermediate film 13 may have a wedge-shaped cross section. Also, a light control film 14 and a polarizing plate 15p are prepared. An optical component in which the light control film 14 and the polarizing plate 15p are integrated may be prepared.

[0077] Next, for example, the third surface 11 of the first glass plate 11 ３ The concealing layer 18 is formed on the side edge peripheral portion and / or the top edge peripheral portion of the first glass plate 11. When the concealing layer 18 is a colored ceramic layer, for example, a ceramic color paste is applied to the third surface 11 of the first glass plate 11. ３ The coating material can be applied to the peripheral side edges and / or the peripheral top edge of the substrate by screen printing or the like, and then fired.

[0078] Next, after the step of forming the concealing layer 18, the first glass plate 11 and the second glass plate 12 are bent. For example, a press molding method can be used to bend the first glass plate 11 and the second glass plate 12. Specifically, a mold with concave and convex shapes corresponding to the final shape of the laminated glass 10 is prepared, and the first glass plate 11 and the second glass plate 12 are each heated to a predetermined temperature to soften them, and then pressed using this mold to bend the first glass plate 11 and the second glass plate 12. Note that gravity forming, roller forming, or the like may also be used to bend the first glass plate 11 and the second glass plate 12.

[0079] In the laminated glass 10, the difference in thickness between the first glass sheet 11 and the second glass sheet 12 is preferably 0.3 mm or less, and more preferably 0.2 mm or less. It is particularly preferable that the thicknesses of the first glass sheet 11 and the second glass sheet 12 are the same. The smaller the difference in thickness between the first glass sheet 11 and the second glass sheet 12, the more similar their behaviors during bending become, thereby reducing perspective distortion.

[0080] Next, the resin film that will become the interlayer 13 is stretched as necessary. Then, a laminate is produced by sandwiching, from the first glass plate 11 side, the resin film that will become the interlayer 13, the polarizing plate 15p, the light control film 14, and the resin film that will become the interlayer 13 between the first glass plate 11 and the second glass plate 12. An additional interlayer 13 may be sandwiched between the polarizing plate 15p and the light control film 14. An additional interlayer 13 may also be sandwiched around the polarizing plate 15p and the light control film 14 in a frame-like shape. Then, for example, this laminate is placed in a rubber bag, rubber chamber, resin bag, or the like, and bonded at a temperature controlled to a range of approximately 70°C to 110°C in a vacuum controlled at a gauge pressure of -100 kPa to -65 kPa. Heating conditions, temperature conditions, and lamination methods are selected as appropriate.

[0081] Furthermore, by carrying out a pressure bonding process in which heating and pressing are carried out under controlled conditions, for example, at a temperature of 100°C to 150°C and an absolute pressure of 0.6 MPa to 1.5 MPa, a laminated glass 10 with even greater durability can be obtained. However, in some cases, this heating and pressing step may not be used in order to simplify the process and in consideration of the properties of the material to be sealed in the laminated glass 10. The laminated glass 10 is completed through the above steps.

[0082] Alternatively, a so-called cold bending method may be used in which the second glass sheet 12 is bent in advance, and the first glass sheet 11, which is in a flat state with an interlayer film 13 or the like sandwiched therebetween, is curved to match the shape of the second glass sheet 12 and bonded to produce the laminated glass 10.

[0083] In addition to the interlayer 13, films or devices having functions such as heating, infrared reflection, light emission, power generation, touch panel, visible light reflection, scattering, decoration, and absorption may be provided between the first glass sheet 11 and the second glass sheet 12, as long as the effects of the present invention are not impaired. Furthermore, the surface of the laminated glass 10 may have a film having functions such as anti-fogging, water repellency, heat insulation, and low reflection. ３ and the second surface 12 of the second glass plate 12 ２ The insulating layer may have a film having a function of heat insulation, heat generation, etc.

[0084] <Modification> Fig. 3 is a cross-sectional view illustrating a laminated glass according to Modification 1 of the first embodiment. The laminated glass 10A shown in Fig. 3 differs from the laminated glass 10 in that the polarizing plate 15p is replaced with a polarizing plate 15s. The laminated glass 10A is used in combination with a light source 50 that irradiates the first glass plate 11 with S-polarized visible light Ls.

[0085] The polarizing plate 15s is sealed in the intermediate film 13. The polarizing plate 15s is an optical component that transmits P-polarized visible light and blocks S-polarized visible light. The polarizing plate 15s is disposed between the light control film 14 and the first glass plate 11. Note that "blocking S-polarized visible light" does not only mean completely blocking S-polarized visible light, but also includes blocking 90% or more of it.

[0086] In the illustrated example, the polarizing plate 15s is spaced apart from the light control film 14, and a part of the intermediate film 13 is disposed between the opposing surfaces of the polarizing plate 15s and the light control film 14. The polarizing plate 15s may be in contact with the light control film 14 to form an integrated structure, rather than being spaced apart from the light control film 14. In this case, the polarizing plate 15s is disposed so as to be in contact with the surface of the light control film 14 facing the vehicle interior.

[0087] In the laminated glass 10A, similarly to the laminated glass 10, the area that overlaps with the light control film 14 in a planar view can be used as the HUD display area R. When a HUD image is projected onto the HUD display area R, good contrast is obtained and the visibility of the HUD image is improved by lowering the transmittance of the light control film 14 that forms the background of the HUD display area R. On the other hand, when a HUD image is not projected, the transmittance of the light control film 14 is increased so that the driver and others are no longer aware of the presence of the light control film 14, thereby reducing the feeling of oppression or claustrophobia felt by the driver and others.

[0088] In the laminated glass 10A, a polarizing plate 15s is disposed between the light control film 14 and the first glass plate 11. The S-polarized visible light Ls is incident on the fourth surface 11. ４ The light is reflected by the polarizing plate 15s, and part of the light passes through the intermediate film 13 and reaches the polarizing plate 15s. However, the polarizing plate 15s blocks S-polarized visible light, so no S-polarized reflected light occurs on the vehicle exterior side of the polarizing plate 15s. ２ Since no S-polarized reflected light occurs, the occurrence of double and triple images is suppressed, and the visibility of the HUD image can be improved. The above-mentioned effect cannot be achieved even if the polarizing plate 15s is disposed only between the light control film 14 and the second glass plate 12. Furthermore, if the visible light transmittance of the polarizing plate 15s and the interlayer film 13 located between the first glass plate 11 and the first glass plate 11 is 50% or less, the visibility of double and triple images can be further suppressed.

[0089] Fig. 4 is a cross-sectional view illustrating a laminated glass according to a second modification of the first embodiment. The laminated glass 10B shown in Fig. 4 differs from the laminated glass 10 in that a polarizing plate 15s is added. A liquid crystal is placed between the polarizing plates 15s and 15p to change the polarization state of light, thereby simultaneously controlling transmittance and suppressing the occurrence of double images. The laminated glass 10B is used in combination with a light source 50 that irradiates the first glass plate 11 with P-polarized visible light Lp.

[0090] The polarizing plate 15s is encapsulated in the intermediate film 13. The polarizing plate 15s is disposed between the light control film 14 and the second glass plate 12. The polarizing plates 15p and 15s are not separated from the light control film 14 but are integral with the light control film 14. The polarizing plate 15p is disposed so as to contact the surface of the light control film 14 facing the inside of the vehicle, and the polarizing plate 15s is disposed so as to contact the surface of the light control film 14 facing the outside of the vehicle.

[0091] The laminated glass 10B has the same effects as the laminated glass 10. However, by switching the positions of the polarizing plate 15p and the polarizing plate 15s in the laminated glass 10B, it can be used in combination with a light source 50 that irradiates the first glass sheet 11 with S-polarized visible light Ls. In this case, the same effects as the laminated glass 10A can be achieved.

[0092] In the laminated glass 10B, the polarization characteristics of the two polarizing plates may be the same. For example, if the light from the light source 50 is P-polarized, both polarizing plates can be polarizing plates 15p. Alternatively, if the light from the light source 50 is S-polarized, both polarizing plates can be polarizing plates 15s. With this configuration, if the light control film 14 is a reverse-mode light control film that is transparent when no voltage is applied, it is transparent when not energized, which has the effect of providing a sense of openness to the occupants when the HUD image is not being projected, such as when the vehicle is stopped.

[0093] Fig. 5 is a cross-sectional view illustrating a laminated glass according to Modification 3 of the first embodiment. The laminated glass 10C shown in Fig. 5 differs from the laminated glass 10A in the cross-sectional shape of the interlayer film 13. The laminated glass 10C is used in combination with a light source 50 that irradiates the first glass sheet 11 with unpolarized visible light Lu.

[0094] In the laminated glass 10C, the interlayer film 13 has a wedge-shaped cross section at least in the HUD display region R. That is, the interlayer film 13 has a wedge-shaped cross section at least in the HUD display region R, with the thickness of the interlayer film 13 gradually increasing from the lower edge toward the upper edge of the laminated glass 10C when the laminated glass 10C is installed in a vehicle.

[0095] In the laminated glass 10C, unpolarized visible light Lu passes through the fourth surface 11 ４ The light is reflected by the polarizing plate 15s, and part of it passes through the intermediate film 13 and reaches the polarizing plate 15s. The polarizing plate 15s blocks S-polarized visible light contained in the unpolarized visible light Lu, so no S-polarized reflected light occurs on the vehicle exterior side of the polarizing plate 15s. On the other hand, the polarizing plate 15s transmits P-polarized visible light contained in the unpolarized visible light Lu. Therefore, the polarizing plate 15s does not transmit P-polarized visible light contained in the unpolarized visible light Lu on the vehicle interior side of the light control film 14 or on the second surface 12. ２ Reflected P-polarized light can occur.

[0096] Therefore, in order to suppress the occurrence of double and triple images caused by reflected P-polarized light, the intermediate film 13 is made to have a wedge-shaped cross section. That is, by making the intermediate film 13 have a wedge-shaped cross section, the distance between the main image and the double and triple images is reduced, causing the main image and the double and triple images to almost overlap, making the double and triple images less noticeable.

[0097] In this way, in laminated glass 10C, the polarizing plate 15s is provided to suppress the occurrence of double images and triple images caused by S-polarized light, and the intermediate film 13 has a wedge-shaped cross section to suppress the occurrence of double images and triple images caused by P-polarized light.

[0098] To suppress the occurrence of double and triple images due to P-polarized light, the wedge angle of the interlayer film 13 is preferably varied within a range of more than 0 mrad and less than or equal to 1.0 mrad. The wedge angle of the interlayer film 13 may be 0.1 mrad or more and 0.7 mrad or less, or may be 0.2 mrad or more and 0.5 mrad or less. The wedge angle is calculated by dividing the difference in thickness between the upper and lower ends of the HUD display region R in the vertical direction when the laminated glass 10C is installed in a vehicle by the distance along the shape of the glass between the upper and lower ends. The increase in thickness from the lower end to the upper end of the laminated glass 10C may be a constant monotonous increase, or the increase rate may vary partially.

[0099] Although the interlayer film 13 is formed in a wedge-shaped cross section in the example of FIG. 5 , this is not limiting. That is, it is sufficient that at least one of the first glass plate 11, the second glass plate 12, and the interlayer film 13 has a wedge-shaped cross section in the HUD display region R. For example, the first glass plate 11 and / or 12 may be formed in a wedge-shaped cross section while the interlayer film 13 has a constant thickness, or the interlayer film 13 itself may be formed in a wedge-shaped cross section. In either of the above cases, the total wedge angle is preferably greater than 0 mrad and less than or equal to 1.0 mrad. The total wedge angle may be 0.1 mrad or greater and 0.7 mrad or less, or may be 0.2 mrad or greater and 0.5 mrad or less. This reduces the distance between the main image and the double image, allowing the main image and the double image to almost overlap, making the double image less noticeable.

[0100] Fig. 6 is a cross-sectional view illustrating a laminated glass according to Modification 4 of the first embodiment. The laminated glass 10D shown in Fig. 6 differs from the laminated glass 10 in that an optical reflection layer 16 is added.

[0101] In the laminated glass 10D shown in Fig. 6, the optical reflective layer 16 is a layer that reflects light incident on the first glass plate 11 side. The optical reflective layer 16 is transparent to visible light. The optical reflective layer 16 is disposed in a position that overlaps with the light control film 14 in a plan view. In the example of Fig. 6, the optical reflective layer 16 is disposed on the surface of the first glass plate 11 that is located opposite to the interlayer film 13, i.e., the fourth surface 11 of the first glass plate 11. ４By providing the optical reflection layer 16, the brightness of the HUD image can be improved.

[0102] When the laminated glass is attached to a vehicle, the light control film 14 and the optical reflective layer 16 can be provided on the peripheral edge of the lower side of the laminated glass 10 in a plan view. In this case, the optical reflective layer 16 is preferably positioned so as to overlap the upper side edge of the laminated glass 10 and the light control film 14 in a plan view. That is, the distance L in Fig. 6 is preferably greater than 0, more preferably 5 mm or more, and even more preferably 10 mm or more. By making the distance L greater than 0, the upper side edge of the laminated glass 10 and the optical reflective layer 16 can be made less noticeable.

[0103] In the case of a HUD system using P-polarized light, the optical reflective layer 16 is a P-polarized reflective layer. When P-polarized visible light is incident on the P-polarized reflective layer at an incident angle of 65°, the visible light reflectance is preferably 10% or more and 30% or less. A visible light reflectance of 10% or more can improve the visibility of the HUD image. A visible light reflectance of 30% or less can reduce the reflection of surrounding objects. Furthermore, to realize a suitable HUD system while reducing the reflection of surrounding objects, the visible light reflectance of the optical reflective layer 16 at an incident angle of 65° is preferably 12% or more and 28% or less, more preferably 15% or more and 26% or less.

[0104] The visible light reflectance of the P-polarized reflective layer was measured by measuring the spectral reflectance as specified in ISO 9050:2003 using P-polarized light in the visible wavelength range as incident light at an incident angle θ of 65°, and then calculating the visible light reflectance based on this measurement in accordance with the calculation method for visible light reflectance as specified in ISO 9050:2003.

[0105] Examples of the P-polarized light reflective layer that can be used include a birefringence interference polarizer made of a polymer multilayer film containing two or more types of polymers with different refractive indices, a polarizer having a fine uneven structure known as a wire grid polarizer, and a film containing a polarizer made of a cholesteric liquid crystal layer. When a P-polarized light reflective film is used as the P-polarized light reflective layer, the thickness of the P-polarized light reflective film is preferably 25 μm or more and 200 μm or less. The thickness of the P-polarized light reflective film is more preferably 150 μm or less, and even more preferably 100 μm or less. The P-polarized light reflective film may be attached to the first glass plate 11 by an adhesive layer.

[0106] The use of a P-polarized reflective coating as the P-polarized reflective layer is preferable compared to the use of a P-polarized reflective film, because it provides superior visibility at low brightness, such as at night, and at a wider viewing angle. The use of a P-polarized reflective coating is also preferable because it is easy to control the film thickness and the reflective surface tends to be smooth, making the HUD image less likely to be distorted.

[0107] When a P-polarized reflective coating is used as the P-polarized reflective layer, the thickness of the P-polarized reflective coating is, for example, 50 nm to 500 nm. The P-polarized reflective coating can be formed on the surface of the glass plate by, for example, sputtering or CVD.

[0108] Examples of P-polarized light reflective coatings include a film having a laminated structure of a high refractive index film / a low refractive index film, an infrared reflective film having a laminated structure of a metal film such as silver and a dielectric film, and a low-e film made of a transparent conductive film such as ITO. Among these, a film having a laminated structure of a high refractive index film / a low refractive index film is preferred in that it can maintain a high P-polarized light reflectance. When the high refractive index film / a low refractive index film has a two-layer structure, for example, ４ When the high refractive index film / low refractive index film has a three-layer structure or more, the fourth surface 11 of the first glass plate 11 is laminated with the high refractive index film and the low refractive index film in this order. ４ High refractive index films and low refractive index films are alternately laminated in any order on the substrate.

[0109] The refractive index of the high refractive index film is 1.8 or more, or 1.9 or more, or 2.0 or more, or 2.1 or more, and preferably 2.5 or less, at a wavelength of 550 nm. The refractive index of the low refractive index film is typically less than 1.8, or 1.7 or less, or 1.6 or less, and preferably 1.2 or more, at a wavelength of 550 nm.

[0110] Specifically, the high-refractive-index film preferably contains at least one of the following: oxides of Ti, Zr, Nb, and Sn; mixed oxides of Ti, Zr, Nb, Si, Sb, Sn, Zn, and In; nitrides of Si and Zr; and mixed nitrides of Si and Zr. The low-refractive-index film preferably contains at least one of silicon oxide, silicon oxynitride, silicon oxycarbide, or a mixture thereof. Examples of the mixture include a mixed oxide of silicon and aluminum and a mixed oxide of silicon and zirconium.

[0111] The first layer of the high refractive index film is optionally made up of one or more sublayers. The thickness (geometric film thickness) of the first layer of the high refractive index film is preferably 50 nm or more and 100 nm or less, particularly preferably 60 nm or more and 80 nm or less. The first layer of the low refractive index film is optionally made up of one or more sublayers. The thickness (geometric film thickness) of the first layer of the low refractive index film is preferably 70 nm or more and 160 nm or less, particularly preferably 100 nm or more and 140 nm or less.

[0112] In the case of a HUD system using S-polarized light, i.e., when S-polarized visible light is irradiated from the light source 50 onto the optical reflective layer 16, the optical reflective layer 16 is an S-polarized reflective layer. The visible light reflectance of the S-polarized reflective layer when S-polarized visible light is incident at an incident angle of 65° is preferably 18% or more and 30% or less. A visible light reflectance of 18% or more can improve the visibility of the HUD image. A visible light reflectance of 30% or less can reduce the reflection of surrounding objects. Furthermore, to realize a suitable HUD system while reducing the reflection of surrounding objects, the visible light reflectance of the optical reflective layer 16 at an incident angle of 65° is preferably 12% or more and 28% or less, more preferably 15% or more and 26% or less.

[0113] The visible light reflectance of the S-polarized reflective layer was measured by measuring the spectral reflectance as specified in ISO 9050:2003 using S-polarized light in the visible wavelength range as incident light at an incident angle θ of 65°, and then calculating the visible light reflectance based on the measured spectral reflectance according to the calculation method for visible light reflectance as specified in ISO 9050:2003. ２ and high refractive index materials such as SiO ２ Examples of the S-polarized light reflective layer include an optical interference film in which low refractive index materials such as SiO 2 and SiO 2 are alternately stacked. The S-polarized light reflective layer may be a film that is attached to a glass plate with an adhesive layer.

[0114] In the laminated glasses 10A, 10B, 10C, and 10E described later, the optical reflective layer 16 may be disposed at a position overlapping the light control film 14 in a plan view. This can further improve the brightness of the HUD image.

[0115] The optically reflective layer 16 may be a layer that is transparent to visible light and has a holographic function.

[0116] Fig. 7 is a cross-sectional view illustrating a laminated glass according to Modification 5 of the first embodiment. The laminated glass 10E shown in Fig. 7 differs from the laminated glass 10 in that a heat ray reflective film 17 is added. The laminated glass 10E is used in combination with a light source 50 that irradiates the first glass sheet 11 with P-polarized visible light Lp.

[0117] The heat ray reflecting film 17 is a film capable of reflecting infrared rays. The heat ray reflecting film 17 is disposed between the light control film 14 and the second glass plate 12 at a position overlapping the polarizing plate 15p in plan view. The heat ray reflecting film 17 is disposed, for example, on the second surface 12 of the second glass plate 12. ２ The heat ray reflecting film 17 can be disposed at a position overlapping the polarizing plate 15p in plan view. ２ It may be arranged throughout the entire

[0118] The heat ray reflective film 17 may have any configuration as long as it can reflect infrared rays. The heat ray reflective film 17 may be, for example, a film in which a metal or metal oxide is sandwiched between dielectrics. The heat ray reflective film 17 may contain at least one selected from the group including silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), and ion-doped metal oxides. However, the heat ray reflective film 17 preferably contains a layer containing silver (Ag) as a main component, and more preferably contains two or more layers containing silver (Ag) as a main component, because this provides high heat ray reflection performance.

[0119] Examples of ion-doped metal oxides include indium tin oxide (ITO), fluorine-doped tin oxide (FTO), aluminum-doped zinc oxide (AZO), and gallium zinc oxide (GZO).

[0120] The thickness of the heat ray reflecting film 17 is not particularly limited, but may be in the range of 100 nm to 4000 nm, or in the range of 100 nm to 1000 nm, for example.

[0121] In this way, by arranging the heat ray reflecting film 17 at a position overlapping the polarizing plate 15p in a plan view, deterioration of the polarizing plate 15p due to infrared rays can be suppressed. Note that in the laminated glasses 10A, 10B, 10C, and 10D, the heat ray reflecting film 17 may be arranged at a position overlapping the polarizing plate. This can suppress deterioration of the polarizing plate due to infrared rays.

[0122] Examples and Comparative Examples Below, examples and comparative examples will be described, but the present invention is not limited to these examples and comparative examples. Examples 3, 5, 9, 11, 15, 17, 21, 23, 25, and 27 are examples. Examples 1, 2, 4, 6, 7, 8, 10, 12, 13, 14, 16, 18, 19, 20, 22, 24, 26, and 28 are comparative examples.

[0123] [Example 1] First, green glass (manufactured by AGC Inc., commonly known as VFL) was prepared as a first glass plate and a second glass plate. The dimensions of the first glass plate were 300 mm x 300 mm x 1.8 mm thickness. The dimensions of the second glass plate were 300 mm x 300 mm x 2.0 mm thickness. Neither the first glass plate nor the second glass plate had a wedge shape in cross section, and the plate thickness was constant.

[0124] Two PVB films (RE11 manufactured by Eastman Chemical Co.) were prepared as interlayer resin films. Each resin film had dimensions of 300 mm × 300 mm × 0.38 mm. A polymer-dispersed liquid crystal (PDLC) film (NB004 manufactured by Toppan Corporation) was prepared as a light-control film.

[0125] Next, one of the resin films to be used as an interlayer, the light control film, and the other of the resin films to be used as an interlayer were sandwiched between the first glass plate and the second glass plate, from the first glass plate side, to prepare a laminate. The laminate was then placed in a rubber bag and evacuated under a vacuum of 640 mmHg for 7 minutes. After preheating at 100°C for 40 minutes, the bag was heated and pressurized in an autoclave set to 135±10°C under a pressure of 1.30±0.07 MPa for a holding time of 30±5 minutes. This produced a laminated glass.

[0126] Next, the light control film of this laminated glass was controlled to have the lowest visible light transmittance (minimum transmittance 5%), and S-polarized visible light from a light source was irradiated onto the HUD display area to evaluate the occurrence of double and triple images. The incident angle of the visible light from the light source onto the laminated glass was set to 60°.

[0127] Example 2 In Example 2, the laminated glass produced in Example 1 was irradiated with P-polarized visible light from a light source, and the presence or absence of double and triple images was evaluated.

[0128] [Example 3] In Example 3, a polarizing plate (D20-1883, manufactured by Narica Co., Ltd., thickness 0.2 mm) that blocks S-polarized visible light was prepared. Then, one of the resin films that would serve as an interlayer, a polarizing plate, a light control film, and the other of the resin films that would serve as an interlayer were sandwiched between a first glass plate and a second glass plate from the first glass plate side, and laminated glass was produced in the same manner as in Example 1. Next, S-polarized visible light from a light source was irradiated onto this laminated glass, and the presence or absence of double images and triple images was evaluated.

[0129] Example 4 In Example 4, the laminated glass produced in Example 3 was irradiated with P-polarized visible light from a light source, and the presence or absence of double and triple images was evaluated.

[0130] [Example 5] In Example 5, a polarizing plate (D20-1883, manufactured by Narica Co., Ltd., thickness 0.2 mm) that blocks P-polarized visible light was prepared. Then, one of the resin films that would serve as an interlayer, a polarizing plate, a light control film, and the other of the resin films that would serve as an interlayer were sandwiched between a first glass plate and a second glass plate from the first glass plate side, and laminated glass was produced in the same manner as in Example 1. Next, P-polarized visible light from a light source was irradiated onto this laminated glass, and the presence or absence of double images and triple images was evaluated.

[0131] Example 6 In Example 6, the laminated glass produced in Example 5 was irradiated with S-polarized visible light from a light source, and the presence or absence of double images and triple images was confirmed.

[0132] [Example 7] In Example 7, a laminated glass was produced and evaluated in the same manner as in Example 1, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) (minimum transmittance 0.9%) was used as the light-control film.

[0133] Example 8 In Example 8, a laminated glass was produced and evaluated in the same manner as in Example 2, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) was used as the light-control film.

[0134] Example 9 In Example 9, a laminated glass was produced and evaluated in the same manner as in Example 3, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) was used as the light-control film.

[0135] Example 10 In Example 10, a laminated glass was produced and evaluated in the same manner as in Example 4, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) was used as the light-control film.

[0136] Example 11 In Example 11, a laminated glass was produced and evaluated in the same manner as in Example 5, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) was used as the light-control film.

[0137] Example 12 In Example 12, a laminated glass was produced and evaluated in the same manner as in Example 6, except that a suspended particle device (SPD) (manufactured by Resonac Co., Ltd.) was used as the light-control film.

[0138] Example 13 In Example 13, a laminated glass was produced and evaluated in the same manner as in Example 1, except that an electrochromic (EC) film (manufactured by Ambilight) (minimum transmittance 2%) was used as the light-control film.

[0139] Example 14 In Example 14, a laminated glass was produced and evaluated in the same manner as in Example 2, except that an electrochromic (EC) film (manufactured by Ambilight) was used as the light-control film.

[0140] Example 15 In Example 15, a laminated glass was produced and evaluated in the same manner as in Example 3, except that an electrochromic (EC) film (manufactured by Ambilight) was used as the light-control film.

[0141] Example 16 In Example 16, a laminated glass was produced and evaluated in the same manner as in Example 4, except that an electrochromic (EC) film (manufactured by Ambilight) was used as the light-control film.

[0142] Example 17 In Example 17, a laminated glass was produced and evaluated in the same manner as in Example 5, except that an electrochromic (EC) film (manufactured by Ambilight) was used as the light-control film.

[0143] Example 18 In Example 18, a laminated glass was produced and evaluated in the same manner as in Example 6, except that an electrochromic (EC) film (manufactured by Ambilight) was used as the light-control film.

[0144] [Example 19] In Example 19, a laminated glass was produced and evaluated in the same manner as in Example 1, except that a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) (minimum transmittance 0.3%) was used as the light-control film.

[0145] Example 20 In Example 20, laminated glass was produced and evaluated in the same manner as in Example 2, except that a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) was used as the light-control film.

[0146] Example 21 In Example 21, a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) was used as the light-control film, and laminated glass was produced and evaluated in the same manner as in Example 3. Here, an optical component in which the GHLC and a polarizing plate were integrated was used, and the polarizing plate was positioned so that it faced the first glass plate (the vehicle interior side).

[0147] Example 22 In Example 22, a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) was used as the light-control film, and laminated glass was produced and evaluated in the same manner as in Example 4. Here, an optical component in which the GHLC and a polarizing plate were integrated was used, and the polarizing plate was positioned so that it faced the first glass plate (the vehicle interior side).

[0148] Example 23 In Example 23, a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) was used as the light-control film, and laminated glass was produced and evaluated in the same manner as in Example 5. Here, an optical component in which the GHLC and a polarizing plate were integrated was used, and the polarizing plate was positioned so that it faced the first glass plate (the vehicle interior side).

[0149] Example 24 In Example 24, a guest-host liquid crystal (GHLC) (manufactured by Dai Nippon Printing Co., Ltd.) was used as the light-control film, and laminated glass was produced and evaluated in the same manner as in Example 6. Here, an optical component in which the GHLC and a polarizing plate were integrated was used, and the polarizing plate was positioned so that it faced the first glass plate (the vehicle interior side).

[0150] Example 25 In Example 25, a laminated glass was produced and evaluated in the same manner as in Example 3, except that a twisted nematic liquid crystal (TN liquid crystal) (manufactured by Sumitomo Chemical Co., Ltd.) (minimum transmittance 0.001%) was used as the light-control film. The TN liquid crystal has a structure in which a polarizer that blocks S-polarized light is disposed on one side of the liquid crystal, and a polarizer that blocks P-polarized light is disposed on the other side of the liquid crystal. Here, the polarizer that blocks S-polarized light was disposed facing the first glass plate (inside the vehicle), and the polarizer that blocks P-polarized light was disposed facing the second glass plate (outside the vehicle).

[0151] Example 26 In Example 26, a laminated glass was produced and evaluated in the same manner as in Example 4, except that a twisted nematic liquid crystal (TN liquid crystal) (manufactured by Sumitomo Chemical Co., Ltd.) was used as the light control film. Here, the polarizing plate that blocks S-polarized light was positioned facing the first glass plate (inside the vehicle), and the polarizing plate that blocks P-polarized light was positioned facing the second glass plate (outside the vehicle).

[0152] Example 27 In Example 27, a laminated glass was produced and evaluated in the same manner as in Example 5, except that a twisted nematic liquid crystal (TN liquid crystal) (manufactured by Sumitomo Chemical Co., Ltd.) was used as the light-control film. Here, the polarizing plate that blocks P-polarized light was positioned facing the first glass plate (inside the vehicle), and the polarizing plate that blocks S-polarized light was positioned facing the second glass plate (outside the vehicle).

[0153] Example 28 In Example 28, a laminated glass was produced and evaluated in the same manner as in Example 6, except that a twisted nematic liquid crystal (TN liquid crystal) (manufactured by Sumitomo Chemical Co., Ltd.) was used as the light-control film. Note that here, the polarizing plate that blocks P-polarized light was positioned facing the first glass plate (inside the vehicle), and the polarizing plate that blocks S-polarized light was positioned facing the second glass plate (outside the vehicle).

[0154] [Evaluation Results] Part of the structure of the laminated glass and the evaluation results are shown in Figures 8 to 12. For the evaluation, the HUD display area of ​​the laminated glass was visually observed from a position 1.5 m away from the fourth surface of the first glass plate, and if neither a double image nor a triple image was visible, it was rated as ○ (good), if a double image was visible but not a triple image, it was rated as △ (poor), and if a triple image was visible, it was rated as × (poor).

[0155] As shown in Examples 1 and 2 in Figure 8, when PDLC was used for the light control film and the laminated glass did not have a polarizing plate, the evaluation results were poor both when S-polarized visible light was irradiated from the light source and when P-polarized visible light was irradiated from the light source.

[0156] In contrast, as shown in Example 3 in Figure 8, when a polarizing plate that blocks S-polarized visible light was placed on the inside of the vehicle relative to the light control film and S-polarized visible light was irradiated from the light source, no double or triple images were observed and good evaluation results were obtained. It is thought that this result was obtained because S-polarized visible light cannot pass through the polarizing plate, so no S-polarized reflected light was generated on the inside surface of the light control film or the second surface of the second glass plate.

[0157] Furthermore, as shown in Example 4 in Figure 8, when a polarizing plate that blocks S-polarized visible light was placed on the inside of the vehicle relative to the light control film and P-polarized visible light was irradiated from the light source, a double image was visible but a triple image was not. It is thought that the P-polarized light that passed through the polarizing plate was reflected by the inside surface of the light control film, causing the double image to be visible. On the other hand, since P-polarized light has a lower reflectivity on glass than S-polarized light, it is thought that the P-polarized light that passed through the light control film was hardly reflected by the second surface of the second glass plate, and therefore a triple image was not visible.

[0158] As shown in Example 5 in Figure 8, when a polarizing plate that blocks P-polarized visible light was placed on the inside of the vehicle relative to the light control film and P-polarized visible light was irradiated from the light source, no double or triple images were observed and good evaluation results were obtained. It is thought that such results were obtained because P-polarized visible light cannot pass through the polarizing plate, so no P-polarized reflected light was generated on the inside surface of the light control film or the second surface of the second glass plate.

[0159] Furthermore, as shown in Example 6 in Figure 8, when a polarizing plate that blocks P-polarized visible light was placed on the inside of the vehicle relative to the light control film and S-polarized visible light was irradiated from a light source, double and triple images were observed. It is thought that the S-polarized light that passed through the polarizing plate was reflected by the inside surface of the light control film, causing the double image to be observed. Furthermore, because S-polarized light has a higher reflectivity on glass than P-polarized light, it is thought that the S-polarized light that passed through the light control film was reflected by the second surface of the second glass plate, causing the triple image to be observed.

[0160] As shown in Examples 7 to 12 in Figure 9, when an SPD was used in the light-control film, similar results were obtained as when a PDLC was used in the light-control film. Furthermore, as shown in Examples 13 to 18 in Figure 10, when an EC was used in the light-control film, similar results were obtained as when a PDLC was used in the light-control film. Furthermore, as shown in Examples 19 to 24 in Figure 11, when a GHLC was used in the light-control film, similar results were obtained as when a PDLC was used in the light-control film.

[0161] As shown in Examples 25 to 28 in Figure 12, when TN liquid crystal was used for the light control film, results were almost the same as when PDLC was used for the light control film. However, in Example 28, double images were observed, but triple images were not. This is thought to be because S-polarized light that passed through the polarizing plate on the inside of the vehicle was reflected by the inside surface of the light control film, causing the double images to be observed. On the other hand, S-polarized visible light that passed through the light control film did not pass through the polarizing plate on the outside of the vehicle, so no S-polarized reflected light was generated on the second surface of the second glass plate, and therefore triple images were not observed.

[0162] In this way, in a head-up display system using a light source that irradiates S-polarized visible light, the occurrence of double and triple images can be suppressed and the visibility of the HUD image can be improved by placing a polarizing plate that blocks S-polarized visible light between the light control film and the first glass plate. Also, in a head-up display system using a light source that irradiates P-polarized visible light, the occurrence of double and triple images can be suppressed and the visibility of the HUD image can be improved by placing a polarizing plate that blocks P-polarized visible light between the light control film and the first glass plate.

[0163] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0164] In addition to the above embodiments, the following supplementary notes are further disclosed. (Supplementary Note 1) A laminated glass comprising a first glass plate, a second glass plate, and an interlayer film positioned between the first glass plate and the second glass plate and bonding the first glass plate to the second glass plate, the laminated glass having a light control film and a polarizing plate encapsulated in the interlayer film, wherein, in a planar view, the area of ​​the light control film is 30% or less of the area of ​​the first glass plate, and the polarizing plate is disposed between the light control film and the first glass plate. (Supplementary Note 2) The laminated glass according to Supplementary Note 1, further comprising an optical reflective layer disposed on the surface of the first glass plate opposite the interlayer film, in a position overlapping the light control film in a planar view. (Supplementary Note 3) The laminated glass according to Supplementary Note 2, wherein the optical reflective layer has a visible light reflectance of 15% or more when P-polarized visible light is incident at an incident angle of 65 degrees. (Appendix 4) The laminated glass according to Appendix 2 or 3, wherein, when the laminated glass is attached to a vehicle, the light control film and the optical reflective layer are provided on the peripheral edge of the lower side of the laminated glass in a plan view. (Appendix 5) The laminated glass according to Appendix 4, wherein, when the laminated glass is attached to a vehicle, the optical reflective layer is located at a position overlapping the upper side end of the light control film of the laminated glass in a plan view. (Appendix 6) The laminated glass according to any one of Appendixes 1 to 5, wherein the light control film includes any one selected from the group consisting of twisted nematic liquid crystal, guest-host liquid crystal, polymer dispersed liquid crystal, electrochromic, and suspended particle device. (Appendix 7) The laminated glass according to Appendix 6, wherein the light control film has a minimum visible light transmittance of 15% or less. (Appendix 8) The laminated glass according to any one of Appendixes 1 to 7, wherein a heat ray reflective film is located between the light control film and the second glass plate in a position overlapping the polarizing plate in a plan view. (Supplementary Note 9) A head-up display system for a vehicle, comprising: the laminated glass according to any one of Supplementary Notes 1 to 8; a light source that irradiates the first glass sheet with P-polarized visible light; and the polarizing plate that blocks the P-polarized visible light.(Supplementary Note 10) A head-up display system for a vehicle, comprising: the laminated glass according to any one of Supplementary Notes 1 to 8; a light source that irradiates the first glass sheet with S-polarized visible light; and the polarizing plate that blocks the S-polarized visible light. (Supplementary Note 11) A head-up display system for a vehicle, comprising: the laminated glass according to any one of Supplementary Notes 1 to 8; a light source that irradiates the first glass sheet with unpolarized visible light; and the polarizing plate that blocks the S-polarized visible light, wherein at least one of the first glass sheet, the second glass sheet, and the interlayer film has a region that has a wedge-shaped cross section whose thickness gradually increases from the bottom edge toward the top edge of the laminated glass when the laminated glass is installed in a vehicle.

[0165] According to the present invention, it is possible to improve the visibility of the HUD image while reducing the sense of oppression or claustrophobia felt by the driver or the like.

[0166] 1 HUD system 10, 10A, 10B, 10C, 10D, 10E Laminated glass 11 First glass plate 11 ３ 3rd page 11 ４ Fourth surface 12 Second glass plate 12 １ 1st page 12 ２ Second surface 13 Intermediate film 14 Light control film 15p, 15s Polarizing plate 16 Optical reflection layer 17 Heat ray reflection film 18 Shielding layer 19 Information transmission / reception area 50 Light source 51 Light emitting section 52 First optical system 53 Image display element 54 Second optical system 55 Concave mirror

Claims

1. A laminated glass comprising a first glass plate, a second glass plate, and an interlayer film positioned between the first glass plate and the second glass plate and bonding the first glass plate to the second glass plate, wherein the laminated glass has a light control film and a polarizing plate encapsulated in the interlayer film, wherein the area of ​​the light control film is 30% or less of the area of ​​the first glass plate in a plan view, and the polarizing plate is disposed between the light control film and the first glass plate.

2. The laminated glass according to claim 1, further comprising an optically reflective layer disposed on the surface of the first glass plate opposite the interlayer film in a position overlapping the light control film in a plan view.

3. The laminated glass according to claim 2, wherein the optically reflective layer has a visible light reflectance of 15% or more when P-polarized visible light is incident at an incident angle of 65 degrees.

4. The laminated glass according to claim 2, wherein, when the laminated glass is attached to a vehicle, the light control film and the optical reflective layer are provided along the peripheral edge of the lower side of the laminated glass in a plan view.

5. The laminated glass according to claim 4, wherein, when the laminated glass is attached to a vehicle, the optical reflective layer is positioned so as to overlap the upper edge of the light control film of the laminated glass in a plan view.

6. The laminated glass according to claim 1, wherein the light management film comprises any one selected from the group consisting of twisted nematic liquid crystal, guest-host liquid crystal, polymer dispersed liquid crystal, electrochromic, and suspended particle device.

7. The laminated glass according to claim 6, wherein the light control film has a minimum visible light transmittance of 15% or less.

8. The laminated glass according to claim 1, wherein the polarizing plate blocks 90% or more of P-polarized or S-polarized visible light.

9. The laminated glass of claim 1, wherein an additional polarizing plate is disposed between the light management film and the second glass plate.

10. The laminated glass according to claim 9, wherein one of the polarizing plate and the additional polarizing plate blocks P-polarized visible light, and the other blocks S-polarized visible light.

11. The laminated glass according to claim 9, wherein one of the polarizing plate and the additional polarizing plate blocks P-polarized or S-polarized visible light, and the other blocks visible light of the same polarization.

12. The laminated glass according to claim 1, wherein the visible light transmittance of the interlayer film between the polarizing plate and the first glass plate is 50% or less.

13. The laminated glass according to claim 1, wherein a heat ray reflecting film is disposed between the light control film and the second glass plate at a position overlapping the polarizing plate in a plan view.

14. A head-up display system for a vehicle, comprising: the laminated glass according to any one of claims 1 to 7 and 12 to 13; a light source that irradiates the first glass sheet with P-polarized visible light; and the polarizing plate that blocks the P-polarized visible light.

15. A head-up display system for a vehicle, comprising: the laminated glass according to any one of claims 1 to 7 and 12 to 13; a light source that irradiates the first glass sheet with S-polarized visible light; and the polarizing plate that blocks the S-polarized visible light.

16. A head-up display system for a vehicle, comprising: the laminated glass according to any one of claims 1 to 7 and 12 to 13; a light source that irradiates the first glass sheet with unpolarized visible light; and a polarizing plate that blocks S-polarized visible light, wherein at least one of the first glass sheet, the second glass sheet, and the intermediate film has a wedge-shaped cross-sectional area whose thickness gradually increases from the bottom edge toward the top edge of the laminated glass when the laminated glass is installed in a vehicle.

Images