Dimming glass laminate

Abstract

To provide a dimming glass laminate capable of preventing short circuit due to contact of a pair of conductive layers contained in a dimming part.SOLUTION: The dimming glass laminate 10 includes a dimming layer 14 that can adjust the light transmittance when a voltage is applied, a pair of conductive layers 15, 15 that are arranged to sandwich the dimming layer 14 and apply voltage to the dimming layer 14 when power is supplied, an intermediate layer 13 having insulation properties arranged to sandwich the conductive layer 15, and a pair of glass plates 11, 12 each having a first region A and a second region B with different curvatures so as to sandwich the intermediate layer 13. The second region B contains a curved area 40 with a smaller radius of curvature than that of the first region A, and a short-circuit prevention unit 50 is formed between the pair of curved areas 40, 40 to prevent short-circuiting caused by the contact of the pair of conductive layers 15, 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a light control laminated glass. [Background technology]

[0002] Light-adjustable laminated glass, in which a light-adjusting section whose transmittance can be changed electrically is enclosed in an interlayer, is known for use in automobile and train windowpanes. The light-adjusting section is composed of a light-adjusting layer and a pair of conductive layers sandwiching the light-adjusting layer. To improve the privacy of passengers, such light-adjustable laminated glass, for example, scatters light and becomes like frosted glass when the light-adjusting layer is in the off state, and becomes transparent when the light-adjusting section is in the on state. For example, a liquid crystal element is used as the light-adjusting layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 153998 Summary of the Invention [Problem to be solved by the invention]

[0004] In light control laminated glass used in the window glass of vehicles and the like, a light control part with a small thickness is used. In addition, light control laminated glass may have a curved region in part to match the shape of a vehicle or the like. For this reason, if the light control part (light control layer and a pair of conductive layers) is disposed between a pair of curved regions, wrinkles may occur in the light control part, and the wrinkles may cause the pair of conductive layers to come into contact and short-circuit. If the pair of conductive layers in the light control part are short-circuited, appropriate electricity cannot be passed from the pair of conductive layers to the light control layer, and light control becomes impossible not only in the short-circuited part of the pair of conductive layers but also in the entire light control layer.

[0005] Therefore, there is a demand for a light control laminated glass that can prevent a short circuit caused by contact between a pair of conductive layers included in a light control portion. [Means for solving the problem]

[0006] The characteristic configuration of the light control laminated glass of the present invention is that it comprises a light control layer capable of adjusting the light transmittance by application of a voltage, a pair of conductive layers arranged to sandwich the light control layer and applying the voltage to the light control layer by supplying power, an insulating intermediate layer arranged to sandwich the conductive layer, and a pair of glass plates arranged to sandwich the intermediate layer, each having a first region and a second region with different curvatures, wherein the second region includes a curved region having a smaller radius of curvature than the first region, and a short circuit prevention portion is formed between the pair of curved regions to prevent a short circuit due to contact between the pair of conductive layers.

[0007] In the case where a pair of glass plates are formed to have a pair of curved regions, and a light-controlling layer and a pair of conductive layers are disposed between the pair of curved regions, the pair of conductive layers may come into contact and short-circuit. Therefore, the light-controlling laminated glass of the present configuration includes a pair of glass plates each having a first region and a second region with different curvatures, the second region includes a curved region with a smaller radius of curvature than the first region, and a short-circuit prevention part is formed between the pair of curved regions to prevent a short circuit caused by contact between the pair of conductive layers disposed with the light-controlling layer sandwiched therebetween. Therefore, the light-controlling laminated glass can prevent a short circuit of the pair of conductive layers disposed between the pair of curved regions due to the presence of the short-circuit prevention part. As a result, the light-controlling laminated glass can stably continue light control even if the shape includes a curved region. As a result, the light-controlling laminated glass can maintain a good light-control function.

[0008] Another characteristic feature is that the short-circuit prevention section does not have the light control layer and the pair of conductive layers, but is composed only of the intermediate layer and the pair of glass plates.

[0009] In the present configuration, when the short-circuit prevention part does not have a light control layer and a pair of conductive layers, but is composed only of an intermediate layer and a pair of glass plates, a short circuit caused by the pair of conductive layers does not occur in the short-circuit prevention part. This allows the light control laminated glass to continue light control stably in areas other than the short-circuit prevention part. As a result, the light control laminated glass can properly ensure its light control function.

[0010] Another characteristic feature is that the short-circuit prevention portion does not have a pair of the conductive layers, and is composed only of the light control layer, the intermediate layer, and the pair of the glass plates.

[0011] In the present configuration, when the short circuit prevention part does not have a pair of conductive layers and is composed only of a light control layer, an intermediate layer, and a pair of glass plates, a short circuit caused by the pair of conductive layers does not occur in the short circuit prevention part. This allows the light control laminated glass to continuously control light in areas other than the short circuit prevention part. As a result, the light control laminated glass can properly ensure its light control function.

[0012] Another characteristic configuration is that the short-circuit prevention portion separates the light-adjusting layer and the pair of conductive layers arranged between a pair of the first regions from the light-adjusting layer and the pair of conductive layers arranged between a pair of the second regions so that the boundary between the first region and the second region is electrically non-conductive in a planar view.

[0013] According to this configuration, the short circuit prevention part separates the light control layer and the pair of conductive layers arranged between the pair of first regions from the light control layer and the pair of conductive layers arranged between the pair of second regions in a plan view. Therefore, the light control layer and the pair of conductive layers in the pair of first regions and the light control layer and the pair of conductive layers arranged between the pair of second regions each independently exert light control functions. As a result, even if the pair of conductive layers are short-circuited in the pair of second regions including the curved region and light control by the light control layer becomes impossible, the light control laminated glass can continue to control light individually by the light control layer arranged between the pair of first regions. As a result, the light control laminated glass can properly ensure the light control function.

[0014] Another characteristic configuration is that the short-circuit prevention portion makes the film thickness of the photochromic layer arranged between a pair of the second regions larger than the film thickness of the photochromic layer arranged between a pair of the first regions.

[0015] According to this configuration, in the pair of second regions, the presence of the photochromic layer having a thickness greater than that of the photochromic layer between the pair of first regions ensures a large distance between the pair of conductive layers. Therefore, even if wrinkles occur in the photochromic layer and the pair of conductive layers in the second region including the curved region, the pair of conductive layers can be maintained apart from each other, preventing a short circuit due to contact between the pair of conductive layers. This allows the photochromic laminated glass to stably continue light control by the photochromic layer even in the curved region having the short circuit prevention portion. As a result, the photochromic laminated glass can ensure an appropriate photochromic function.

[0016] Another characteristic configuration is that the short-circuit prevention portion has an insulating member interposed between the light-adjusting layer and the pair of conductive layers arranged between the pair of first regions and the light-adjusting layer and the pair of conductive layers arranged between the pair of second regions, so that the boundary between the first region and the second region is electrically non-conductive in a planar view.

[0017] According to this configuration, an insulating member is interposed between the light control layer and the pair of conductive layers arranged between the pair of first regions, and the light control layer and the pair of conductive layers arranged between the pair of second regions. Therefore, the light control layer and the pair of conductive layers arranged between the pair of first regions, and the light control layer and the pair of conductive layers arranged between the pair of second regions, each independently exhibit a light control function. As a result, even if the light control of the light control layer arranged between the pair of second regions becomes impossible due to the influence of a short circuit of the pair of conductive layers, the light control by the light control layer arranged between the pair of first regions can be continued individually. As a result, the light control laminated glass can properly ensure the light control function.

[0018] Another characteristic feature is that the voltage of 30 V or more is applied to the light-controlling layer when the haze value is set to 10% or less.

[0019] In this configuration, when a voltage of 30 V or more is applied to the light-controlling layer to reduce the haze value to 10% or less, the transparency of the light-controlling layer can be effectively increased, and short circuits caused by high voltage are prevented by the short-circuit prevention section, allowing the light-controlling function to be properly performed.

[0020] Another characteristic feature is that the light-controlling layer has a thickness of 5 μm or more and 150 μm or less.

[0021] According to this configuration, since the thickness of the light control layer is 5 μm or more and 150 μm or less, the light control laminated glass can ensure an appropriate light control function in the light control layer while reducing the weight of the light control layer. Moreover, even with such a thin light control layer, the short circuit prevention part prevents the pair of conductive layers from coming into contact with each other, thereby preventing short circuits.

[0022] Another characteristic feature is that in the second region, the glass plate has a three-dimensional curvature.

[0023] In this configuration, the glass plate in the second region has a three-dimensional curvature, so that the shape of the light control laminated glass can be appropriately changed according to the installation location. Even if the glass plate has a complex shape with a three-dimensional curvature, the short circuit prevention part prevents the pair of conductive layers from coming into contact with each other, thereby preventing a short circuit.

[0024] Another characteristic feature is that the intermediate layer includes a support layer that supports the conductive layer, and an adhesive layer having a Young's modulus smaller than that of the support layer.

[0025] The intermediate layer used in the laminated glass is often made of a material with a high Young's modulus in order to ensure the strength of the laminated glass. However, if an intermediate layer with a high Young's modulus is disposed on both sides of the pair of conductive layers, when the light-control laminated glass vibrates, the vibration transmitted from the intermediate layer to the pair of conductive layers may adversely affect the light-control layer. In this configuration, the intermediate layer includes a support layer that supports the conductive layer and an adhesive layer having a smaller Young's modulus than the support layer. With this configuration, the light-control layer and the pair of conductive layers are supported by the support layer, and when the light-control laminated glass vibrates, the vibration transmitted from the adhesive layer to the support layer can be reduced. As a result, the light-control laminated glass can properly protect the light-control layer and the pair of conductive layers by the support layer and the adhesive layer. As a result, the light-control laminated glass can properly prevent the intermediate layer from deteriorating the function of the light-control layer.

[0026] Another feature is that it is located on the roof of the vehicle.

[0027] As in this configuration, by arranging the light control laminated glass on the roof of the vehicle, it is possible to achieve both a sense of openness inside the vehicle and privacy by adjusting the light of the light control laminated glass arranged on the roof.

[0028] Another characteristic feature is that at least the short circuit prevention portion is provided with a shielding film.

[0029] If the short-circuit prevention part does not have a light control layer and a conductive layer, the short-circuit prevention part cannot control light. Therefore, the presence of the short-circuit prevention part may impair the appearance of the light control laminated glass. Therefore, in this configuration, a shielding film is provided in the short-circuit prevention part. This allows the short-circuit prevention part to be reliably shielded from the outside by the shielding film. As a result, the light control laminated glass can maintain a good appearance.

[0030] Another characteristic feature is that the first area is a substantially flat surface with a radius of curvature of 3000 mm or more, and the second area is a curved surface with a radius of curvature of 2000 mm or less.

[0031] According to this configuration, the first region is flat and the second region is curved, so that the design of the vehicle can be improved. Even if the second region has a curved surface with a radius of curvature of 2000 mm or less, the short-circuit prevention part prevents the pair of conductive layers from coming into contact with each other, so that a short circuit can be prevented. The above values ​​are examples of the lower and upper limits of the radius of curvature of the glass plate, and the radius of curvature of the first region is, for example, 3000 mm or more, preferably 4000 mm or more, and more preferably 5000 mm or more. The radius of curvature of the second region is, for example, 2000 mm or less, preferably 1000 mm or less, and more preferably 500 mm or less. [Brief description of the drawings]

[0032] [Figure 1] FIG. 2 is a diagram showing a light-adjusting laminated glass disposed on the roof of a vehicle. [Diagram 2] FIG. 2 is a partial cross-sectional view of the light control laminated glass of the first embodiment. [Diagram 3] FIG. 6 is a partial cross-sectional view of the light control laminated glass of the second embodiment. [Figure 4] FIG. 11 is a plan view of a light control laminated glass according to a third embodiment. [Diagram 5] FIG. 11 is a partial cross-sectional view of the light control laminated glass of the third embodiment. [Figure 6] FIG. 11 is a partial cross-sectional view of the light control laminated glass of the fourth embodiment. [Figure 7] FIG. 13 is a plan view of a light control laminated glass according to a fifth embodiment. [Figure 8] FIG. 11 is a partial cross-sectional view of the light control laminated glass of the fifth embodiment. [Figure 9] 1 is a comparative example of a light control laminated glass. [Figure 10] FIG. 2 is a diagram showing an example of a curved shape of a light control laminated glass. [Figure 11] FIG. 2 is a diagram showing an example of a curved shape of a light control laminated glass. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, an embodiment of the light control laminated glass according to the present invention will be described with reference to the drawings. In this embodiment, the light control laminated glass will be described as a glass applied to a vehicle as an example of the light control laminated glass. However, the light control laminated glass is not limited to the following embodiment, and various modifications are possible within the scope of the gist of the invention.

[0034] As shown in Fig. 1, a light control laminated glass 10 (hereinafter referred to as "laminated glass 10") is used, for example, as roof glass for a vehicle. The laminated glass 10 may be used as glass other than the roof glass of the vehicle 1, for example, rear glass, rear side glass, rear quarter glass, door glass, extra glass, windshield, etc. The extra glass is glass attached to the rear side of the vehicle 1 in order to improve rear visibility for the driver of the vehicle 1.

[0035] [First embodiment] 2, the laminated glass 10 includes a pair of glass plates 11, 12, an intermediate layer 13, a light control layer 14, and a pair of conductive layers 15, 15. The intermediate layer 13 is composed of, for example, a first intermediate layer 31 (an example of an adhesive layer) that is bonded to the pair of glass plates 11, 12, and a second intermediate layer 32 (an example of a support layer) that is disposed between the first intermediate layer 31 and the light control layer 14. The light control unit 20 includes the light control layer 14, the pair of conductive layers 15, 15, and the second intermediate layer 32. The light control unit 20 includes an element that can switch the light transmittance of the laminated glass 10.

[0036] The first intermediate layer (adhesive layer) 31, 31 is formed of, for example, a thermoplastic resin. Examples of the thermoplastic resin include a plasticized polyvinyl acetal resin, a plasticized polyvinyl chloride resin, a saturated polyester resin, a plasticized saturated polyester resin, a polyurethane resin, a plasticized polyurethane resin, an ethylene-vinyl acetate copolymer resin, an ethylene-ethyl acrylate copolymer resin, a cycloolefin polymer resin, and an ionomer resin. Of these thermoplastic resins, a plasticized polyvinyl acetal resin is preferably used for the first intermediate layer (adhesive layer) 31, 31. These thermoplastic resins may be used alone or in combination of two or more kinds. The material forming the first intermediate layer 31, 31 is not limited to a thermoplastic resin. The first intermediate layer 31, 31 may contain functional particles such as an infrared absorbing agent, an ultraviolet absorbing agent, and a luminescent agent. The first intermediate layer 31, 31 may have a colored portion called a shade band.

[0037] The second intermediate layer (support layer) 32, 32 is a transparent resin layer. The thickness of the second intermediate layer 32, 32 is, for example, 5 μm or more and 500 μm or less, preferably 10 μm or more and 200 μm or less, and more preferably 50 μm or more and 150 μm or less. The material of the second intermediate layer 32, 32 is, for example, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyether, etc.

[0038] The light control unit 20 is switchable between, for example, a low transmittance state and a high transmittance state. The transmittance may be switchable in multiple steps, or may be switchable steplessly (continuously). The light control unit 20 may be disposed over substantially the entire laminated glass 10, or may be disposed over only a portion of the laminated glass 10, as necessary. The planar shape of the light control unit 20 is, for example, a rectangle smaller than the planar shape of the laminated glass 10.

[0039] The dimming unit 20 is covered with a first intermediate layer 31. In the dimming unit 20, the second intermediate layer 32 is a support layer that supports the pair of conductive layers 15, 15. The first intermediate layer 31 is an adhesive layer having a smaller Young's modulus than the second intermediate layer 32 (support layer). The first intermediate layer 31 and the second intermediate layer 32 are both formed of resin, and the pair of glass plates 11, 12 are bonded to the dimming unit 20 via the first intermediate layer 31.

[0040] For example, the light-adjusting layer 14 has a parallel light transmittance of less than 30% when no voltage is applied, and a parallel light transmittance of 30% or more when a voltage is applied. It is more preferable that the light-adjusting layer 14 has a parallel light transmittance of 20% or less when no voltage is applied, and a parallel light transmittance of 40% or more when a voltage is applied.

[0041] The light-adjusting layer 14 may have a haze of 10% or more when no voltage is applied, and less than 10% when a voltage is applied. More preferably, the light-adjusting layer 14 has a haze of 20% or more when no voltage is applied, and less than 8% when a voltage is applied. The light-adjusting layer 14 may be formed to have a smaller surface area than the intermediate layer 13 (the first intermediate layer 31 and the second intermediate layer 32).

[0042] The light-controlling layer 14 is made of a light-controlling film or the like, and for example, the haze ratio of the film is controlled by the presence or absence of electricity to create a transparent state and an opaque state. That is, the light-controlling layer 14 can adjust the light transmittance by applying a voltage. As the light-controlling layer 14, for example, a known type such as a PDLC (Polymer Dispersed Liquid Crystal) type using liquid crystal, an SPD (Suspended Particle Device) type, an electrochromic type, or a thermochromic type can be used. The light-controlling film is made of a light-controlling layer 14 formed of, for example, liquid crystal, and a pair of conductive layers 15, 15 arranged on both sides of the light-controlling layer 14.

[0043] The pair of conductive layers 15, 15 are disposed to sandwich the light-adjusting layer 14, and when power is supplied, a voltage is applied to the light-adjusting layer 14. Intermediate layer 13 (first intermediate layer 31 and second intermediate layer 32) are disposed so as to sandwich a pair of conductive layers 15, 15, and have insulating properties. For example, a transparent conductive oxide (TCO) can be used as the conductive layers 15, 15. For example, TCO can be tin-doped indium oxide (ITO), aluminum-doped zinc oxide (AZO), indium-doped cadmium oxide, etc. For the conductive layers 15, 15, poly(3,4-ethylenedioxythiophene) (PEDOT), poly(4,4-dioctylcyclopentadithiophene), a laminated film of a metal layer and a dielectric layer, a transparent conductive polymer such as a silver nanowire, a metal mesh of silver or copper, etc. For the conductive layers 15, 15, the materials are not limited to these, and they may be formed of other materials.

[0044] The light-controlling layer 14 is opaque when no voltage is applied, and is transparent through light control when a voltage is applied via the pair of conductive layers 15, 15. The light-controlling layer 14 may be configured to be transparent when no voltage is applied, and opaque when a voltage is applied.

[0045] The light-controlling layer 14 is configured so that, for example, when the haze value is set to 10% or less, a voltage of 30 V or more is applied to it. With this configuration, the light-controlling layer 14 in the laminated glass 10 can satisfactorily increase the transparency and can properly exhibit the light-controlling function.

[0046] The thickness of the switchable layer 14 is, for example, 5 μm to 150 μm, preferably 5 μm to 100 μm, and more preferably 5 μm to 50 μm. When the thickness of the switchable layer 14 is 20 μm to 150 μm, the laminated glass 10 can ensure an appropriate switchable function in the switchable layer 14 while reducing the weight of the switchable layer 14.

[0047] In this embodiment, the laminated glass 10 is a pair of glass plates 11 and 12, of which the first glass plate 11 is disposed on the vehicle inner side and the second glass plate 12 is disposed on the vehicle outer side. The pair of glass plates 11 and 12 face each other, and the intermediate layer 13, the light control layer 14, and the pair of conductive layers 15 and 15 are located between the pair of glass plates 11 and 12. The pair of glass plates 11 and 12 are fixed in a state in which the intermediate layer 13, the light control layer 14, etc. are sandwiched between the pair of glass plates 11 and 12 to form a laminate. The laminate is fixed at a temperature of 70°C to 110°C in a vacuum controlled, for example, in a range of -100 kPa to -65 kPa. These conditions are merely examples, and methods such as heating conditions, temperature conditions, lamination method, and vacuum thickness are appropriately selected.

[0048] Known glass plates can be used for the first glass plate 11 and the second glass plate 12, and they can be made of general clear glass. An example of the composition of clear glass is shown below.

[0049] (Clear glass) SiO 2 :70~73% by mass Al 2 O 3 :0.6~2.4% by mass CaO: 7~12% by mass MgO: 1.0~4.5% by mass R 2 O: 13 to 15 mass% (R is an alkali metal) Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.08~0.14% by mass

[0050] In addition to clear glass, green glass containing a predetermined amount or more of iron, privacy glass, and UV-cut green glass can be suitably used for the first glass sheet 11 and the second glass sheet 12. An example of the composition of privacy glass is shown below.

[0051] (Privacy Glass) SiO2 :66~75% by mass Al 2 O 3 :0~5% by mass CaO: 5~15% by mass MgO: 0~6% by mass R 2 O: 10 to 20 mass% (R is an alkali metal) Fe 2 O 3 Total iron oxide (T-Fe 2 O 3 ):0.5~2.5% by mass TiO 2 :0.2~5% by mass Cobalt oxide (CoO) converted to CoO: 50 to 500 ppm by mass Se:0~70 mass ppm

[0052] A pair of glass plates 11, 12 are arranged to sandwich an intermediate layer 13, and each of the glass plates 11, 12 has a first region A and a second region B with different curvatures. In the second region B, the glass plates 11, 12 have a three-dimensional curvature. That is, in the second region B, the glass plates 11, 12 are formed to be curved not only in the vehicle front-rear direction but also in the vehicle left-right direction.

[0053] The second region B includes a curved region 40 having a smaller radius of curvature than the first region A. In the laminated glass 10, for example, the first region A is a substantially flat surface having a radius of curvature of 3000 mm or more, and the second region B is a curved surface having a radius of curvature of 2000 mm or less. The above values ​​are examples of the lower and upper limits of the radius of curvature of the glass plate, and the radius of curvature of the first region A is, for example, 3000 mm or more, preferably 4000 mm or more, and more preferably 5000 mm or more. The radius of curvature of the second region B is, for example, 2000 mm or less, preferably 1000 mm or less, and more preferably 500 mm or less.

[0054] Comparative Example For example, when a part of the flat laminated glass 60A shown in the upper diagram of Fig. 9 is bent to form the laminated glass 60B shown in the lower diagram of Fig. 9, wrinkles may occur in the enclosed area C between the curved regions 40 included in the second region B. In this case, the pair of conductive layers 15, 15 may come into contact with each other and short-circuit, and when the pair of conductive layers 15, 15 are short-circuited, all light control by the light control layer 14 becomes impossible.

[0055] The mechanism by which wrinkles occur in the laminated glass 60B will be described below. When two pieces of glass with particularly deep curvatures are formed as the pair of glass sheets 11 and 12, the radii of curvature of the two pieces of glass differ from each other. For example, the radius of curvature of the first glass sheet 11 is smaller than the radius of curvature of the second glass sheet 12. Due to such a difference in the radii of curvature of the pair of glass sheets 11 and 12, a misalignment occurs in the pair of conductive layers 15 and 15 sandwiched between the pair of glass sheets 11 and 12, and shear stress remains after compression bonding, which increases the wrinkles in the dimming section 20. Furthermore, when the pair of glass sheets 11 and 12 have a three-dimensional curvature, the misalignment of the pair of conductive layers 15 and 15 is more likely to occur, which increases the wrinkles in the dimming section 20.

[0056] In the process of fixing the pair of glass plates 11, 12 while sandwiching the intermediate layer 13, the light control layer 14, etc., wrinkles occur in the light control section 20 when the functional film follows the curved shape of the glass plates. In particular, these wrinkles are more likely to occur on curved surfaces with a small radius of curvature. In other words, the smaller the radius of curvature of the curved surface, the more incompatible the upper and lower surfaces of the second intermediate layer 32 and the conductive layer 15 become when the laminated second intermediate layer 32 (support layer) and conductive layer 15 follow the curved shape of the glass plates 11, 12.

[0057] In addition, in the pair of glass plates 11, 12, the curved surface perimeter differs from place to place in the portion with a large radius of curvature. When the planar light control layer 14 is inserted in the portion with a large radius of curvature of the pair of glass plates 11, 12 and the intermediate layer 13 is laminated on the light control layer 14, a surplus portion appears in the intermediate layer 13 in which the light control layer 14 is present in the portion with different curved surface perimeters. This surplus portion occurs particularly in the portion where the gap between the perimeter of the pair of glass plates 11, 12 and the perimeter of the intermediate layer 13 is large. The curved glass plates 11, 12 and the intermediate layer 13 with the light control layer 14 interposed therebetween are laminated to form a laminate. As described above, this laminate is fixed at a high temperature in a vacuum to form a laminated glass. At this high temperature, the intermediate layer 13 expands and contracts, and the surplus portion (gap in perimeter) described above is gradually relaxed, and the intermediate layer 13, which was flat on the curved glass surface, follows it. However, in the case where the pair of glass plates 11, 12 has a small radius of curvature in parts thereof, or where the pair of glass plates 11, 12 has a three-dimensional curvature as described below, this relaxation may be insufficient and wrinkles may occur. These wrinkles may cause the pair of conductive layers 15, 15 to come into contact with each other, resulting in a short circuit.

[0058] The following two embodiments are exemplified as three-dimensional laminated glass. The laminated glass 61 shown in FIG. 10 is a so-called dish-shaped laminated glass in which two radii of curvature in orthogonal directions are formed on convex portions in the same direction (for example, convex upward and convex upward). The laminated glass 62 shown in FIG. 11 is a so-called saddle-shaped laminated glass in which two radii of curvature in orthogonal directions are formed on convex portions in different directions (convex upward and convex downward). In the case of the dish-shaped laminated glass 61, the perimeter of the laminated glass 61 is shorter on the edge side. That is, when a flat intermediate layer 13 is laminated between a pair of glass plates 11 and 12, the intermediate layer 13 is left over on the edge side of the laminated glass 61. Therefore, wrinkles in the light control section 20 are likely to occur on the edge side of the laminated glass 61. On the other hand, in the case of the saddle-shaped laminated glass 62, the perimeter of the laminated glass 62 is shorter on the center side. That is, when a flat intermediate layer 13 is laminated between a pair of glass plates 11 and 12, the intermediate layer 13 is left over on the center side of the laminated glass 62. Therefore. Wrinkles in the light control section 20 are likely to occur in the center of the laminated glass 62. In the case of the embodiment shown in Figures 10 and 11, the wrinkles may cause the pair of conductive layers 15, 15 to come into contact with each other, increasing the possibility of causing a short circuit.

[0059] Therefore, in the laminated glass 10 of this embodiment, as shown in FIG. 2, a short-circuit prevention part 50 is formed between the pair of curved regions 40, 40. The short-circuit prevention part 50 is provided to prevent a short circuit caused by contact between the pair of conductive layers 15, 15. Therefore, the presence of the short-circuit prevention part 50 in the laminated glass 10 can prevent a short circuit between the pair of conductive layers 15, 15 arranged between the pair of curved regions 40, 40. This allows the laminated glass 10 to stably continue light control even when the laminated glass 10 has a shape including the curved region 40. As a result, the light control function of the laminated glass 10 can be well maintained.

[0060] In this embodiment, as shown in Fig. 2, the short-circuit prevention unit 50 does not have the light control layer 14 and the pair of conductive layers 15, 15, and is composed only of the second intermediate layer 32 and the pair of glass plates 11, 12. Therefore, no short circuit occurs due to the pair of conductive layers 15, 15 in the short-circuit prevention unit 50. This allows the laminated glass 10 to stably continue to control light in areas other than the short-circuit prevention unit 50. As a result, the light control function of the laminated glass 10 can be properly ensured.

[0061] The short-circuit prevention part 50 is provided with a shielding film 16. The shielding film 16 is an opaque layer, and is provided, for example, in a strip shape along the peripheral part of the laminated glass 10 including the short-circuit prevention part 50. The shielding film 16 is, for example, an opaque (for example, black) colored ceramic layer. The shielding film 16 may be a colored intermediate film or colored film having light-shielding properties, or may be a combination of at least one of them and a colored ceramic layer. The colored film may be integrated with an infrared reflective film or the like.

[0062] Since the laminated glass 10 has an opaque shielding film 16, deterioration of resin such as urethane that holds the peripheral portion of the laminated glass 10 to the vehicle body due to ultraviolet rays can be suppressed. In addition, the shielding film 16 can conceal the pair of conductive layers 15, 15 electrically connected to the light control layer 14 and the wiring connected to the electrodes so that they are difficult to see from the outside and / or inside of the vehicle. In addition, the short circuit prevention part 50 can be reliably shielded from the outside by the shielding film 16. As a result, the laminated glass 10 can maintain a good appearance.

[0063] The shielding film 16 can be formed, for example, by applying a ceramic color paste containing a fusible glass frit containing a black pigment onto the glass plates (glass plates 11 and 12) by screen printing or the like, and then firing the paste, but is not limited to this. The shielding film 16 may also be formed, for example, by applying an organic ink containing a black or dark color pigment onto the glass plate by screen printing or the like, and then drying the ink.

[0064] 2, the shielding film 16 is provided on the vehicle interior side of the first glass sheet 11 and the vehicle interior side of the second glass sheet 12. The shielding film 16 may be provided on only one of the vehicle interior side of the first glass sheet 11 and the vehicle interior side of the second glass sheet 12.

[0065] In this embodiment, as shown in Fig. 1, a laminated glass 10 is disposed on the roof of a vehicle 1. This allows the vehicle 1 to easily achieve both a sense of openness inside the vehicle and privacy by controlling the light of the laminated glass 10 disposed on the roof.

[0066] It is preferable that the first region A of the laminated glass 10 is a substantially flat surface with a radius of curvature of 5000 mm or more, and the second region B is a curved surface with a radius of curvature of 2000 mm or less. In this way, the first region Aa of the laminated glass 10 is flat and the second region B is a curved surface, thereby improving the design of the vehicle.

[0067] In this embodiment, the intermediate layer 13 includes the second intermediate layer 32 as a support layer supporting the conductive layer 15, and the first intermediate layer 31 as an adhesive layer having a smaller Young's modulus than the support layer (second intermediate layer 32). Therefore, the light control layer 14 and the pair of conductive layers 15 are supported by the support layer (second intermediate layer 32), and when the laminated glass 10 vibrates, the vibration transmitted from the adhesive layer (first intermediate layer 31) to the support layer (second intermediate layer 32) can be reduced. As a result, the laminated glass 10 can properly protect the light control layer 14 and the pair of conductive layers 15 by the first intermediate layer 31 and the second intermediate layer 32. As a result, the laminated glass 10 can properly prevent the function of the light control layer 14 from being deteriorated by the intermediate layer 13. In particular, by configuring the second intermediate layer 32 as the light control section 20, the light control section 20 is easy to handle, and the laminated glass 10 can be easily manufactured by bonding the glass plates 11 and 12 to the light control section 20 via the first intermediate layer 31. Furthermore, even if the first intermediate layer 31 acting as an adhesive layer is deformed, the problem of the light-controlling layer 14 being damaged can be prevented.

[0068] Second Embodiment 3, in the second embodiment, the short-circuit prevention part 50 in the second region B of the laminated glass 10 is composed of a light control layer 14, an intermediate layer 13, and a pair of glass plates 11, 12. That is, in this embodiment, the short-circuit prevention part 50 does not have a pair of conductive layers 15, 15. The other configurations are the same as those in the first embodiment.

[0069] In the present embodiment, when the short-circuit prevention part 50 does not have the pair of conductive layers 15, 15 and is composed only of the intermediate layer 13 and the pair of glass plates 11, 12, no short circuit occurs due to the pair of conductive layers 15, 15 in the short-circuit prevention part 50. Therefore, the laminated glass 10 can stably continue to control light in parts other than the short-circuit prevention part 50. As a result, the light control function of the laminated glass 10 can be properly ensured.

[0070] Third Embodiment 4 and 5, in the third embodiment, the short-circuit prevention section 50 in the second region B of the laminated glass 10 separates the light control section 20 arranged between a pair of first regions A from the light control section 20 arranged between a pair of second regions B so that the boundary between the first regions A and the second regions B is electrically non-conductive in a plan view. The other configurations are the same as those of the first embodiment.

[0071] According to this embodiment, the short circuit prevention part 50 reduces the curved state of the light control part 20 arranged between the pair of second regions B, so that it is possible to prevent a short circuit between the pair of conductive layers 15B, 15B in the pair of curved regions 40. In addition, since the light control part 20 in the pair of first regions A and the light control part 20 in the pair of second regions B are separated, the light control layer 14A in the first region A and the light control layer 14B in the second region B can be independently controlled. Therefore, even if the pair of conductive layers 15B, 15B are short-circuited in the second region B and the light control by the light control layer 14B becomes impossible, the laminated glass 10 can continue the light control by the light control layer 14A arranged between the pair of first regions A. As a result, the laminated glass 10 can properly ensure the light control function in the specific region (first region A).

[0072] [Fourth embodiment] 6, in the fourth embodiment, the short-circuit prevention part 50 in the second region B of the laminated glass 10 is configured such that the thickness T2 of the light-controlling layer 14B disposed between a pair of second regions B is larger than the thickness T1 of the light-controlling layer 14A disposed between a pair of first regions A. The other configurations are the same as those of the first embodiment.

[0073] According to this embodiment, in the pair of second regions B, the presence of the photochromic layer 14B having a thickness T2 larger than the thickness T1 ensures a large distance between the pair of conductive layers 15, 15. Therefore, even if wrinkles occur in the photochromic section 20 (the photochromic layer 14B and the pair of conductive layers 15, 15), the pair of conductive layers 15, 15 are maintained in a spaced apart state, and the pair of conductive layers 15, 15 can prevent short circuits due to contact. This allows the laminated glass 10 to stably continue the photochromic control by the photochromic layer 14B even in the curved region 40 having the short circuit prevention section 50. As a result, the laminated glass 10 can properly ensure the photochromic function. Here, the thickness T1 is, for example, 5 μm or more and 150 μm or less, preferably 5 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less. On the other hand, the thickness T2 is, for example, 50 μm or more and 500 μm or less, preferably 30 μm or more and 200 μm or less, and more preferably 40 μm or more and 150 μm or less.

[0074] Fifth embodiment 7 and 8, in the fifth embodiment, the short-circuit prevention part 50 in the second region B of the laminated glass 10 has an insulating member 51 made of rubber, resin or the like interposed between the light control part 20 (the light control layer 14A and the pair of conductive layers 15A, 15A) between the pair of first regions A and the light control part 20 (the light control layer 14B and the pair of conductive layers 15B, 15B) between the pair of second regions B so that the boundary between the first region A and the second region B is electrically non-conductive in a plan view. The other configurations are the same as those of the first embodiment.

[0075] According to this embodiment, the insulating member 51 as the short circuit prevention part 50 reduces the curved state of the light control layer 14 and the pair of conductive layers 15B, 15B arranged between the pair of second regions B, so that a short circuit of the pair of conductive layers 15B, 15B in the pair of curved regions 40 can be prevented. In addition, since the light control part 20 of the pair of first regions A and the light control part 20 of the pair of second regions B are separated, the light control layer 14A of the first region A and the light control layer 14B of the second region B can be independently controlled. Therefore, even if the light control by the light control layer 14B becomes impossible in the second region B due to the influence of the pair of conductive layers 15B, 15B being short-circuited, the laminated glass 10 can continue the light control by the light control layer 14A between the pair of first regions A. As a result, the laminated glass 10 can properly secure the light control function in the specific region (first region A).

[0076] [Other embodiments] (1) In the above embodiment, the second region B is provided only on the front side in the vehicle longitudinal direction in the laminated glass 10, but the second region B may be provided on both the front and rear sides, or only on the rear side in the vehicle longitudinal direction. In addition, the second region B may be provided on both the left and right sides, or only on one side, in the vehicle transverse direction. (2) In the above embodiment, the laminated glass 10 is used as a glass for the vehicle 1, but the laminated glass 10 may be used for things other than vehicles. (3) In the above embodiment, several examples were shown in which the shielding film 16 was provided in the short-circuit prevention portion 50. However, the laminated glass 10 may be configured without providing the shielding film 16 in the short-circuit prevention portion 50. [Industrial Applicability]

[0077] The present invention is widely applicable to light control laminated glass. [Explanation of symbols]

[0078] 10: Light-adjusting laminated glass 11: First glass plate 12: Second glass plate 13: Middle class 14, 14A, 14B: Light control layer 15,15A,15B: Conductive layer 16: Shielding membrane 20: Dimming section 31: 1st intermediate layer (adhesive layer) 32: Second intermediate layer (support layer) 40: Curved area 50: Short circuit prevention part 51: Insulating material A:First area B:Second area T1, T2: Film thickness

Claims

1. a light control layer capable of adjusting light transmittance by application of a voltage; A pair of conductive layers arranged to sandwich the light-adjusting layer and configured to apply the voltage to the light-adjusting layer when power is supplied thereto; an intermediate layer having insulating properties and disposed so as to sandwich the conductive layer; a pair of glass plates arranged to sandwich the intermediate layer, each of which has a first region and a second region having different curvatures; The second region includes a curved region having a smaller radius of curvature than the first region, The light control laminated glass has a short circuit prevention portion formed between the pair of curved regions to prevent a short circuit caused by contact between the pair of conductive layers.

2. The light-control laminated glass according to claim 1 , wherein the short-circuit prevention section does not include the light-control layer and the pair of conductive layers, and is composed only of the intermediate layer and the pair of glass plates.

3. The light-control laminated glass according to claim 1 , wherein the short-circuit prevention section does not have the pair of conductive layers, and is composed only of the light-control layer, the intermediate layer, and the pair of glass plates.

4. 2. The light-control laminated glass according to claim 1, wherein the short-circuit prevention portion separates the light-control layer and the pair of conductive layers arranged between the pair of first regions from the light-control layer and the pair of conductive layers arranged between the pair of second regions such that a boundary between the first region and the second region is electrically non-conductive in a planar view.

5. The light-control laminated glass according to claim 1 , wherein the short-circuit prevention portion makes the thickness of the light-control layer disposed between a pair of the second regions larger than the thickness of the light-control layer disposed between a pair of the first regions.

6. 2. The light control laminated glass according to claim 1, wherein the short-circuit prevention portion has an insulating member interposed between the light control layer and the pair of conductive layers arranged between the pair of first regions and the light control layer and the pair of conductive layers arranged between the pair of second regions, so that a boundary between the first region and the second region is electrically non-conductive in a planar view.

7. The light control laminated glass according to claim 1 , wherein the voltage applied to the light control layer is 30 V or more when the haze value is set to 10% or less.

8. The light control laminated glass according to claim 1 , wherein the light control layer has a film thickness of 5 μm or more and 150 μm or less.

9. The light control laminated glass according to claim 1 , wherein the glass plate has a three-dimensional curvature in the second region.

10. The light control laminated glass according to claim 1 , wherein the intermediate layer includes a support layer that supports the conductive layer, and an adhesive layer having a Young's modulus smaller than that of the support layer.

11. The light control laminated glass according to claim 1 , which is disposed on a roof of a vehicle.

12. The light control laminated glass according to claim 11 , wherein at least the short circuit prevention portion is provided with a shielding film.

13. The light control laminated glass according to claim 12 , wherein the first region is a substantially flat surface having a radius of curvature of 3000 mm or more, and the second region is a curved surface having a radius of curvature of 2000 mm or less.

Images