Laminated glass for vehicles with earth structure

Abstract

Provided is a grounding structure-equipped glass laminate for vehicles in which electrostatic countermeasures are applied to a functional layer for electrically driving.　A grounding structure-equipped glass laminate for vehicles according to the present invention which is obtained by layering a first glass plate, an intermediate film and a second glass plate in this order, said glass laminate being characterized in that: the intermediate film has a functional layer for electrically driving, a power supply member which is electrically connected to the functional layer, a first circuit to which the power supply member and the functional layer are connected in series, and a second circuit which is connected in series and includes the power supply member, a flexible ESD shield and a ground member; the second circuit has a dielectric body in one or more locations within the second circuit; and the ground member is grounded.

Description

[Technical Field]

[0001] The present invention relates to a laminated glass for a vehicle with an earthing structure. [Background technology]

[0002] Conventionally, there has been known a laminated glass for vehicles in which a functional layer having various functions is provided between one glass pane and the other glass pane, and the functional layer is driven by power supplied from an external power source to perform a desired function, thereby realizing the function (for example, Patent Document 1).

[0003] For example, Patent Document 1 below discloses laminated glass in which an organic EL panel layer, a dimming device layer, or an anti-fogging device layer is bonded between a first glass sheet and a second glass sheet via an interlayer film. These functional layers, which have various functions, are connected to thin, strip-shaped conductors and are supplied with power from a power source. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2014 / 122704 Summary of the Invention [Problem to be solved by the invention]

[0005] In laminated glass encapsulating an electrically driven functional layer such as a display, if static electricity from a charged object, including a human body, is discharged via wiring during storage, transportation, installation in a vehicle, use, etc., the encapsulated functional layer itself or the semiconductor components in the functional layer may be electrostatically damaged. Even if a person touches the glass surface of the laminated glass, static electricity can propagate along the glass surface, reach the wiring, and eventually flow into the semiconductor components.

[0006] Electrostatic protection elements are known as one way to protect semiconductor components in the functional layer from static electricity, but they are difficult to install because they have poor adaptability to material deformation during lamination of the laminated glass. Furthermore, in ordinary laminated glass, the semiconductor components in the functional layer are electrically floating, making it structurally difficult to provide shielding / earthing for static electricity protection.

[0007] The present invention has been made in view of the above-mentioned problems, and provides a laminated glass for vehicles with an earthing structure in which a static electricity countermeasure is implemented for an electrically driven functional layer. [Means for solving the problem]

[0008] A laminated glass for a vehicle with an earthed structure according to one embodiment of the disclosure comprises a first glass sheet, an interlayer film, and a second glass sheet laminated in this order, the interlayer film having an electrically driven functional layer, a power supply member electrically connected to the functional layer, a first circuit in which the power supply member and the functional layer are connected in series, and a second circuit including the power supply member, a flexible ESD shield, and a grounding member connected in series, the second circuit having a dielectric at at least one location within the second circuit, and the grounding member being grounded. [Effects of the Invention]

[0009] According to one embodiment of the disclosure, it is possible to provide a laminated glass for vehicles with an earthing structure in which anti-static measures are taken against an electrically driven functional layer. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a plan view of a grounded structure-equipped laminated glass for a vehicle according to a first embodiment. [Figure 2] 1 is a perspective view of a grounded structure-equipped laminated glass for a vehicle according to a first embodiment. [Figure 3] 1 is a cross-sectional view of a grounded structure-equipped laminated glass for a vehicle according to a first embodiment. [Figure 4]FIG. 3 is another cross-sectional view of the grounded structure-equipped laminated glass for a vehicle according to the first embodiment. [Figure 5] FIG. 10 is a perspective view of a grounded structure-equipped laminated glass for a vehicle according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] In this specification, the terms "top" and "bottom" refer to the top and bottom, respectively, when the laminated glass for vehicles with an earthing structure is installed in a vehicle. The "side" of the laminated glass for vehicles with an earthing structure refers to the portion connecting the top and bottom edges. The term "cross section" refers to the cut surface when the laminated glass for vehicles with an earthing structure is cut in the thickness direction, or the side surface of the laminated glass for vehicles with an earthing structure. Note that the term "side surface" does not refer exclusively to the surface including the side edge. In addition, in this specification, the term "periphery" refers to the outermost edge of a specified component, and the term "periphery portion" refers to the vicinity of the "periphery." When the specified component has a hollow, the "periphery" is also referred to as the "outer edge," and may be distinguished from the "inner edge," which is the outer edge of the hollow.

[0012] In this specification, "same shape" means having the same shape as seen in person. Unless otherwise specified, "approximately" means the same as seen in person. Furthermore, "~" indicating a numerical range includes the upper and lower limits.

[0013] The laminated glass for a vehicle with an earth structure according to the embodiment of the present invention can be applied to, for example, a windshield, a rear glass, a side glass, a roof glass, a quarter glass, and the like.

[0014] (First embodiment) A first embodiment of the present invention will be described below with reference to Figures 1 to 4. In each figure, the dimensions of each component are reduced to a different scale to make each component easier to see, and curved shapes are shown as planar shapes.

[0015] FIG. 1 is a plan view illustrating a laminated glass for a vehicle with a grounding structure according to this embodiment. Hereinafter, the laminated glass for a vehicle with a grounding structure will be simply referred to as "laminated glass." The laminated glass 100 includes a first glass sheet 10 and a second glass sheet 20 having identical main surfaces, and an interlayer film 30 disposed therebetween. The first glass sheet 10, the interlayer film 30, and the second glass sheet 20 are laminated in this order. The central axis (not shown) of the laminated glass 100 is an imaginary line in the thickness direction that passes through the center of gravity G of the laminated glass 100. The central axis of the laminated glass 100 is also the Z-axis direction in FIG. 1.

[0016] 1, the laminated glass 100 has a substantially trapezoidal shape in plan view, but is not limited to this. The laminated glass 100 may have, for example, a substantially triangular or rectangular shape in plan view, depending on the part of the vehicle in which it is installed.

[0017] The plan view of the laminated glass 100 and the plan view of the first glass plate 10 refer to a view in which the laminated glass 100 is placed on a horizontal plane with the first glass plate 10 facing up and viewed from above perpendicular to the horizontal plane. The cross-sectional view refers to a view in which a predetermined cross section of the laminated glass 100 is viewed from a direction perpendicular to the horizontal plane.

[0018] Furthermore, at least a portion of the vertical cross section of the laminated glass 100 may be a generally wedge-shaped cross section with a gradually decreasing thickness. A laminated glass having a wedge-shaped cross section with a vertical cross section that increases in thickness from bottom to top is suitable for use as a head-up display (HUD), and is particularly suitable for use as a windshield. For the laminated glass 100 to have such a cross section, it is sufficient that at least a portion of the vertical cross section of at least one of the first glass sheet 10, the second glass sheet 20, and the interlayer film 30 is generally wedge-shaped.

[0019] The laminated glass 100 according to this embodiment includes a functional layer 40 inside the interlayer film 30. The periphery of the functional layer 40 is located inside the periphery of the first glass plate 10. Here, "inside" refers to the direction of the central axis passing through the center of gravity G of the laminated glass 100 when viewed from the periphery of a specific member (here, the first glass plate 10). Conversely, "outside" refers to the direction of the periphery of the specific member (here, the first glass plate 10) when viewed from the central axis passing through the center of gravity G of the laminated glass 100.

[0020] The power supply member 50 is electrically connected to the functional layer 40. In other words, the power supply member 50 and the functional layer 40 are connected in series to form a first circuit. The end (contact point) of the power supply member 50 on the functional layer 40 side may be electrically connected directly to the functional layer 40, or may be electrically connected via a transparent conductive film or a foil-like conductor called a bus bar. Any known means may be used for the connection.

[0021] The power supply member 50 is a flexible connection member in which at least two power supply lines that supply different potentials to the functional layer 40 when the functional layer 40 is in operation are covered with an insulating member 53. Specifically, the power supply member 50 has power supply lines 51 and 52 inside the insulating member 53, and their ends, including portions (contact points) that connect to the functional layer 40, are not covered with the insulating member 53. The end (non-contact point) of the power supply member 50 opposite the functional layer 40 is also not covered with the insulating member 53, but may be covered if necessary. The power supply lines 51 and 52 are connected to the functional layer 40 at their ends (contact points) via, for example, solder or an anisotropic conductive film (ACF). The power supply lines 51 and 52 are spaced apart within the insulating member 53 to prevent electrical short-circuiting. The end (non-contact point) of the power supply member 50 opposite the functional layer 40 can be connected to a vehicle's electronic control unit (ECU).

[0022] In the laminated glass 100 shown in FIG. 1 , the ESD shield 60 is disposed so as to overlap at least a portion of the power supply member 50. Specifically, the ESD shield 60 overlaps a portion of the ends (contact points) of the power supply lines 51 and 52 and a portion of the insulating member 53. The end of the ESD shield 60 in the positive Y-axis direction may be disposed so as to coincide with the end of the power supply lines 51 and 52 in the positive Y-axis direction or with the end of the insulating member 53 in the positive Y-axis direction. This arrangement facilitates adhesion of the interlayer film 30 to the ESD shield 60 and the power supply member 50, reducing the likelihood of defects in the circuit (mainly the second circuit described below). Alternatively, the ESD shield 60 may overlap the power supply lines 51 and 52 not at their ends (contact points) but on the negative Y-axis side of the ends (contact points). The positive Y-axis direction can be rephrased as the direction from the end (non-contact point) of the power supply member 50 opposite the functional layer 40 toward the end (contact point) on the functional layer side.

[0023] The ESD shield 60 is a countermeasure component for ESD (Electro-Static Discharge), and is a flexible conductive component arranged to prevent static electricity discharged to the laminated glass 100 from reaching the functional layer 40. Even if static electricity flows through the power supply line 51 or the power supply line 52, the grounded ESD shield 60 can effectively release the static electricity to the outside of the laminated glass 100.

[0024] The ESD shield 60 is electrically connected to the ground member 55. In other words, the power supply member 50, the ESD shield 60, and the ground member 55 are connected in series with a dielectric included in at least one location to form a second circuit. In other words, the second circuit is also a circuit that maintains electrical insulation during normal operation of the functional layer by including a dielectric. The ground member 55 is a flexible connecting member in which a ground line 56 is covered with an insulating member. The outline of the ground line 56 is shown by a dashed line in FIG. 1. The ground member 55 grounds the ESD shield 60.

[0025] 1, the laminated glass 100 may have a strip-shaped light-shielding portion 90 on its periphery. The light-shielding portion 90 may consist of one layer or multiple layers. The light-shielding portion 90 can at least partially conceal the periphery of the functional layer 40, the power supply member 50, the ground member 55, the ESD shield 60, etc.

[0026] Next, the structure in the vicinity of the ESD shield 60 will be described with reference to Fig. 2. Fig. 2 is a perspective view illustrating an example of a laminated glass for a vehicle with an earthing structure according to this embodiment. In Fig. 2, the first glass plate 10, the light-shielding portion 90, and part of the interlayer film 30 of the laminated glass 100 are omitted. Regarding the interlayer film 30, the first interlayer film 31 and the third interlayer film 33, which will be described later, are omitted, and only the second interlayer film 32 is shown.

[0027] 2, the power supply member 50, the power supply line 51, and the power supply line 52 are each shown in a strip shape, but they may also be linear. Also, the ground member 55 and the ground line 56 are shown in a strip shape, but they may also be linear.

[0028] The second circuit has a dielectric in at least one location within the circuit. The dielectric may include, for example, the intermediate film 30 or the insulating member 53. In other words, at least a portion of the dielectric may be composed of the intermediate film 30, the insulating member 53, or both the intermediate film 30 and the insulating member 53. In this embodiment, the ESD shield 60 is not in direct contact with the power feed lines 51 and 52 of the power feed member 50. Therefore, in the second circuit, the dielectric is disposed between the ESD shield 60 and the power feed lines 51 and 52. Static electricity, which is a high voltage of 2 kV or more, flows from the power feed line 51 or 52 to the ESD shield 60, causing insulation breakdown in the dielectric. This prevents static electricity from flowing into the functional layer 40.

[0029] Specifically, the ground member 55 has a ground line 56 inside an insulating member, and the end (contact point) on the ESD shield 60 side is not covered with the insulating member. In Fig. 2, the end (contact point) of the ground line 56 in the positive Y-axis direction is in contact with and connected to the ESD shield 60 by, for example, solder or an anisotropic conductive film (ACF).

[0030] The power supply member 50 and the ground member 55 are disposed so that their extension directions are substantially parallel. However, parts of the power supply member 50 and the ground member 55 do not have to be substantially parallel. In addition, in FIG. 1, the ground member 55 may be electrically connected to the ESD shield 60 via the vicinity of a side edge and / or the vicinity of the top edge inside the laminated glass 100.

[0031] The distance (distance in the X-axis direction) between the power supply member 50 and the ground member 55 is not particularly limited, but may be, for example, 100 mm or less. The power supply member 50 and the ground member 55 may be adjacent to or overlap each other in a plan view. In this case, the ground line 56 may be disposed between the power supply line 51 and the power supply line 52. The ground line 56 may also be integral with the ESD shield 60. "Integrated" means continuous with no contact points.

[0032] The functional layer 40 may be disposed at any position in the XY plane and in any size, but to protect it from physical impact, moisture, etc., the distance in the XY plane from the periphery of the first glass plate 10 to the periphery of the functional layer 40 is preferably more than 0 mm, more preferably 5 mm or more, and even more preferably 10 mm or more. At the edge where the power supply member 50 is pulled out to the outside of the main surface of the laminated glass 100, the distance in the XY plane from the periphery of the first glass plate 10 to the periphery of the functional layer 40 is preferably 20 mm or more to ensure space for arranging an ESD shield.

[0033] FIG. 3 is a cross-sectional view of the laminated glass 100 cut along the XZ plane at the X1-X2 position in FIG. 1 and viewed from the negative Y-axis direction. In FIG. 3, the laminated glass 100 is formed by laminating a first glass plate 10, an interlayer film 30, and a second glass plate 20 in this order. The first glass plate 10 has a first main surface 10a opposite the interlayer film 30 and a second main surface 10b facing the interlayer film 30. The second glass plate 20 has a third main surface 20c facing the interlayer film 30 and a fourth main surface 20d facing the interlayer film 30. In one embodiment, the laminated glass 100 has a light-shielding portion 90 that includes a light-shielding portion 91 on the second main surface 10b and a light-shielding portion 92 on the fourth main surface 20d. The light-shielding portion 90 does not necessarily have to be formed by a light-shielding portion on the main surface of the glass plate and may include a colored interlayer film or the like.

[0034] The interlayer film 30 includes a first interlayer film 31 in contact with the first glass sheet 10, a second interlayer film 32 in contact with the second glass sheet 20, and a third interlayer film 33 sandwiched between the first interlayer film 31 and the second interlayer film 32. However, the interlayer film 30 may include an interlayer film other than the first interlayer film 31, the second interlayer film 32, and the third interlayer film 33. The functional layer 40 is sandwiched between the first interlayer film 31 and the second interlayer film 32. The periphery of the functional layer 40 is in contact with the third interlayer film 33. That is, in a plan view of the laminated glass 100, the inner edge shape of the third interlayer film 33 is substantially the same as the periphery shape of the functional layer 40. The functional layer 40 is fitted into a hollow portion that is inside the outer edge of the third interlayer film 33.

[0035] By disposing the third interlayer film 33 along the periphery of the functional layer 40, the interlayer film 30 is more likely to adhere to the first glass plate 10 and the second glass plate 20 at the periphery of the functional layer 40, making it less likely that gaps will form at the periphery. However, if the ESD shield 60 is disposed close to the functional layer 40, the inner edge shape of the third interlayer film 33 may be large enough to accommodate the functional layer 40 and the ESD shield 60.

[0036] The third interlayer film 33 is not essential and can be used as needed. The use of the third interlayer film 33 is suitable when the thickness of the functional layer 40 is 0.15 mm or more, and more suitable when it is 0.18 mm or more. In other words, for example, when the thickness of the functional layer 40 is less than 0.15 mm, the third interlayer film 33 does not have to be present. When the interlayer film 30 does not include the third interlayer film 33, the periphery of the functional layer 40 is in contact with at least one of the first interlayer film 31 and the second interlayer film 32.

[0037] 4 is a cross-sectional view of the laminated glass 100 cut along the YZ plane at the Y1-Y2 position in FIG. 1 , viewed from the negative X-axis direction. The following description focuses on the power feeder 51, but the same applies to the power feeder 52. In FIG. 4, the end (contact point) of the power feeder 51 is in contact with the functional layer 40 and not with the ESD shield 60. Because the driving voltage of the functional layer 40 is sufficiently lower than 2 kV, the driving current for the functional layer 40 flows from the power feeder 51 to the functional layer 40 without causing dielectric breakdown. However, because static electricity is a high voltage, when static electricity is generated in the power feeder 51, dielectric breakdown occurs in the dielectric, causing current to flow to the grounded ESD shield 60.

[0038] The minimum non-breakdown voltage of the dielectric (interlayer film 30 or insulating member 53) is preferably 0.5 kV / mm or more and 500 kV / mm or less. If it is 0.5 kV / mm or more, breakdown due to the drive current of the functional layer 40 is unlikely to occur. It is more preferably 1 kV / mm or more, even more preferably 5 kV / mm or more, and particularly preferably 10 kV / mm or more. If it is 500 kV / mm or less, breakdown due to static electricity can occur without extremely thinning the dielectric. It is more preferably 400 kV / mm or less, even more preferably 200 kV / mm or less, and particularly preferably 100 kV / mm or less. Furthermore, it is preferable that the minimum non-breakdown voltage of the interlayer film 30 is lower than the minimum non-breakdown voltage of the insulating member 53. This allows electronic components other than the functional layer 40 to be protected from ESD even when they are located near the power supply member 50 in a position different from the second circuit.

[0039] The minimum non-breakdown voltage can be measured as "dielectric breakdown strength [kV / mm]" based on JIS C2110-3 "Solid electrical insulating materials - Test methods for dielectric breakdown strength - Part 3: Test by applying impulse voltage."

[0040] Furthermore, the value obtained by multiplying the distance [mm] between the first and second ends of the dielectric in the second circuit by the minimum non-breakdown voltage [kV / mm] of the dielectric between the ESD shield 60 and the power supply line 51 is preferably 2 kV or less, and more preferably 1 kV or less. If this value is 2 kV or less, dielectric breakdown is likely to occur even with relatively low-voltage static electricity, making it easier to protect the functional layer 40. The minimum value is not particularly limited as long as it is greater than the drive voltage of the functional layer 40, and may be, for example, 0.2 kV, 0.4 kV, 0.6 kV, or 0.8 kV.

[0041] Note that, because it is difficult to precisely specify the distance [mm] between the first and second ends of the dielectric in the second circuit, the physical distance between the components connected to the first and second ends of the dielectric may be used instead. For example, in this embodiment, the distance [mm] between the ESD shield 60 and the power feed line 51 may be the distance [mm] between the first and second ends of the dielectric in the second circuit. In this case, the first and second ends of the dielectric are the portions of the ends of the dielectric that contact the ESD shield 60 and the power feed line 51, respectively.

[0042] Furthermore, since the ESD shield 60 has a smaller impedance (input impedance) than the functional layer 40, static electricity can flow preferentially toward the ESD shield 60 rather than the functional layer 40. Specifically, it is sufficient that the impedance of the ESD shield 60 is smaller than the impedance of the functional layer 40 at a frequency of 1 MHz or higher (e.g., 8 MHz).

[0043] (Second embodiment) A grounded structure-equipped laminated glass for a vehicle 200 (hereinafter simply referred to as "laminated glass 200") according to a second embodiment of the present invention will be described below with reference to Fig. 5. The laminated glass 200 according to the second embodiment will be described, particularly focusing on the differences from the laminated glass 100 according to the first embodiment, and the description of the laminated glass 100 will be used for other differences. The laminated glass 200 is characterized in that a dielectric is disposed between the ESD shield 61 and the ground member 55 in the second circuit.

[0044] Fig. 5 is a perspective view illustrating a laminated glass 200 according to this embodiment. In Fig. 5, the first glass plate 10, the light-shielding portion 90, and part of the interlayer film 30 of the laminated glass 200 are omitted. Regarding the interlayer film 30, the first interlayer film 31 and the third interlayer film 33, which will be described later, are omitted, and only the second interlayer film 32 is shown. In addition, to make each component easier to see, the dimensions of each component are shown on a different scale, and curved shapes are shown as flat shapes.

[0045] In the laminated glass 200, the ESD shield 61 is integrated with the power supply member 50 and separated from the ground member 55. That is, the ESD shield 61 is continuous with the power supply lines 51 and 52 of the power supply member 50 and is separated from the ground member 55 by the dielectric interlayer 30. The power supply member 50 bends in the positive X-axis direction at the point of contact with the functional layer 40, and the portion extending in the positive X-axis direction from the point of contact with the functional layer 40 can be said to function as the ESD shield 61. The portion of the power supply member 50 extending in the Y-axis direction and connecting to the functional layer 40 constitutes a first circuit.

[0046] 5, the ESD shield 61 is covered by the insulating member 53 of the power supply member 50, but this is not necessarily required. The dielectric separating the ESD shield 61 and the ground member 55 may be, for example, the insulating member 53 or the insulating member of the ground member 55. The ground member 55 may be bent in the negative X-axis direction at the end in the positive Y-axis direction, for example, and extend to the vicinity of the ESD shield 61. In this case, the width (length in the X-axis direction) of the ESD shield 61 may be approximately the same as or smaller than the width of the power supply member 50.

[0047] In this embodiment, the distance [mm] between the ESD shield 61 and the ground line 56 may be the distance [mm] between the first end and the second end of the dielectric in the second circuit.

[0048] The above describes the second circuit in a configuration in which a dielectric is disposed in one location between the ESD shield 60 and the power supply member 50, and in a configuration in which a dielectric is disposed in one location between the ESD shield 61 and the ground member 55. However, the present invention is not limited to these configurations, and a dielectric may be disposed in two or more locations in the second circuit. For example, a dielectric may be disposed between the ESD shield 61 and the power supply member 50 and between the ESD shield 61 and the ground member 55. Furthermore, for example, the ESD shield 61 may be made up of two or more parts, and a dielectric may be disposed between these parts.

[0049] Next, we will explain in more detail each of the components included in the laminated glasses 100, 200. When representing each component, the reference symbols used in Figures 1 to 5 will be used. However, the reference symbols of the laminated glasses 100, 200 will be omitted.

[0050] <Glass plate> The first glass plate 10 and the second glass plate 20 may be flat, or at least one of them may be curved, or both may be curved. The first glass plate 10 and the second glass plate 20 may each be a single-curved (cylindrical) shape that is curved in a single direction, or a complex-curved shape that is curved in two perpendicular directions.

[0051] The radius of curvature of the first glass plate 10 is preferably approximately the same as the radius of curvature of the second glass plate 20 (including when both are flat) or larger than the radius of curvature of the second glass plate 20. That is, the ratio of the minimum radius of curvature (r2) of the second glass plate 20 to the minimum radius of curvature (r1) of the first glass plate 10 is preferably 1≦r1 / r2.

[0052] r1 and r2 are preferably 500 mm or greater, and more preferably 700 mm or greater, in order to reduce the occurrence of wrinkles and perspective distortion in the interlayer film 30. When the laminated glass has a curved shape, the maximum radius of curvature (R1) of the first glass plate 10 and the maximum radius of curvature (R2) of the second glass plate 20 are preferably 100,000 mm or less, more preferably 50,000 mm or less, even more preferably 30,000 mm or less, and particularly preferably 20,000 mm or less.

[0053] When laminated glass having approximately the same r1 and r2 is installed in a vehicle, either the first glass sheet 10 or the second glass sheet 20 may be disposed on the interior side of the vehicle. On the other hand, when laminated glass having different r1 and r2 is installed in a vehicle, the glass sheet having the larger value of r1 or r2 is preferably disposed on the exterior side of the vehicle in order to maintain the strength of the laminated glass. For example, when r1 > r2, the first glass sheet 10 may be disposed on the exterior side of the vehicle, and the second glass sheet 20 may be disposed on the interior side of the vehicle.

[0054] Conventionally known inorganic or organic glass used for vehicle windowpanes can be used for the first glass sheet 10 and the second glass sheet 20. The composition of the first glass sheet 10 and the composition of the second glass sheet 20 may be the same or different. Examples of inorganic glass include ordinary soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, and quartz glass.

[0055] These glass sheets are produced by any known method, such as a float method, a fusion method, a roll-out method, or a down-draw method. Gravity forming, press forming, or the like is used for bending inorganic glass, and the glass sheet is bent at a high temperature. Furthermore, the inorganic glass may be untempered glass obtained by forming molten glass into a sheet and slowly cooling it, and may be subjected to a tempering treatment such as physical tempering (e.g., air-cooling tempering) or chemical tempering, as necessary.

[0056] Examples of organic glass include polycarbonate resin, acrylic resin, polystyrene resin, aromatic polyester resin, polyester resin, polyarylate resin, polycondensation product of halogenated bisphenol A and ethylene glycol, acrylic urethane resin, and halogenated aryl group-containing acrylic resin. Polycarbonate resin is preferred as the organic glass, since it can provide a lightweight and flexible sheet. Two or more of the above resins may be used in combination.

[0057] Among the above examples, soda lime glass or alkali-free glass is preferable for the first glass sheet 10 and the second glass sheet 20. Furthermore, float glass is preferable for the first glass sheet 10 and the second glass sheet 20.

[0058] Both inorganic glass and organic glass are usually colorless, but may be colored as long as they are transparent. In the case of colored glass, it may be so-called privacy glass, particularly dark in color such as gray. Privacy glass has the effect of making it difficult to see inside the vehicle from outside, reducing the transmission of sunlight from outside to inside the vehicle, and improving the aesthetic appearance from inside and outside the vehicle. Privacy glass is preferably used in areas other than the windshield, particularly the roof, side windows at the rear of the vehicle, rear window, quarter window, etc. In addition, inorganic glass and organic glass may contain infrared-shielding materials, ultraviolet-shielding materials, etc.

[0059] The thicknesses of the first glass plate 10 and the second glass plate 20 are selected appropriately depending on the type and location of the vehicle in which the laminated glass is installed, but are generally 0.1 mm to 10 mm each. To keep the density per unit area (area density) calculated from the mass and surface area of ​​the laminated glass within a preferred range, the thicknesses of the first glass plate 10 and the second glass plate 20 are preferably 0.3 mm to 2.6 mm. The thicknesses of the two glass plates 10, 20 may be the same or different.

[0060] When the two glass sheets 10, 20 have different thicknesses, it is preferable from the viewpoint of resistance to stone chipping when the laminated glass is installed in a vehicle to arrange the glass sheet located on the outside of the vehicle to be thicker than the glass sheet located on the inside of the vehicle. In this case, from the viewpoint of resistance to stone chipping, the difference in thickness between the first glass sheet 10 and the second glass sheet 20 of the laminated glass is preferably 0.3 mm to 1.5 mm, more preferably 0.3 mm to 1.3 mm.

[0061] When a laminated glass is installed in a vehicle, the thickness of the glass sheet located on the vehicle exterior side is preferably 1.1 mm or more, more preferably 1.3 mm or more, even more preferably 1.6 mm or more, and particularly preferably 1.8 mm or more, and is preferably 2.6 mm or less, more preferably 2.1 mm or less.

[0062] On the other hand, when the laminated glass is installed in a vehicle, the thickness of the glass sheet located on the vehicle interior side is preferably 0.3 mm or more, more preferably 0.5 mm or more, even more preferably 0.7 mm or more, particularly preferably 1.1 mm or more, and most preferably 1.6 mm or more. The thickness of the glass sheet located on the vehicle interior side is preferably 2.6 mm or less, more preferably 2.1 mm or less.

[0063] The two glass plates 10, 20 may have a coating film laminated on at least one of the surfaces exposed to the atmosphere (first main surface 10a, fourth main surface 20d) that imparts water-repellent properties, hydrophilic properties, anti-fogging properties, etc. Furthermore, the two glass plates 10, 20 may have a coating film laminated on the opposing surfaces (second main surface 10b, third main surface 20c) that usually includes a metal layer, such as a low-emission coating, an infrared-shielding coating, or a conductive coating.

[0064] <Interlayer film> The interlayer film 30 can be a film commonly used in laminated glass. The interlayer film 30 contains, for example, a thermoplastic resin, a thermosetting resin, or a photocurable composition as a main component, and can be formed by solidifying the resin or composition. Note that "solidifying" here includes hardening.

[0065] The interlayer film 30 has various functions, such as bonding components together, cushioning impacts, and sound insulation, which will be described later. From the standpoint of adhesion, it is preferable that at least two of the first interlayer film 31, the second interlayer film 32, and the third interlayer film 33 are made of a material with the same main component, and it is preferable that all of the interlayer films constituting the interlayer film 30 have the same main component.

[0066] The interlayer film 30 is provided with sound insulation properties by laminating layers with different glass transition points. For example, a three-layer laminate structure with sound insulation properties may be formed in the interlayer film 30, in which the layer located at the middle in the thickness direction is a core layer with a glass transition point of less than 15°C, and the two layers sandwiching this core layer (middle layer) are skin layers with a glass transition point of 15°C or higher. For example, a five-layer laminate structure with sound insulation properties may be formed in the interlayer film 30, in which a skin layer, a core layer, a skin layer, a core layer, and a skin layer are laminated in this order. Alternatively, at least one of the first interlayer film 31 and the second interlayer film 32 may have a three-layer laminate structure with sound insulation properties. In these cases, the laminated glass according to this embodiment also exhibits sound insulation effects.

[0067] Examples of thermoplastic resins include polyvinyl acetal resins such as polyvinyl butyral resin (PVB), polyvinyl chloride resin (PVC), saturated polyester resin, polyurethane resin, ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate copolymer resin, and cycloolefin polymer (COP). PVB, EVA, polyurethane resin, etc. are preferred as the thermoplastic resin used for the intermediate film 30. These thermoplastic resins may be used alone or in combination of two or more. Typical thermosetting resins are silicone-based resins and acrylic-based resins.

[0068] The photocurable composition typically contains a curable compound (A) having a curable group and a photopolymerization initiator (B). The photocurable composition may contain other non-curable components in addition to the photopolymerization initiator (B) as needed. Examples of the non-curable components include a non-curable polymer (C), a chain transfer agent (D), and other additives.

[0069] Examples of the curable compound (A) include acrylic, silicone, urethane acrylate, and epoxy compounds. 2 Pa~1×10 7 The curable compound (A) is preferably a silicone-based or urethane acrylate-based compound because it is easy to adjust the Pa. Furthermore, the curable compound (A) is more preferably a urethane acrylate-based compound because it is easy to adjust the gel fraction to 1% to 50%. When a photocurable resin is used for the interlayer film 30, heating is not required in the pressure-bonding step, so there is no risk of the laminated glass cracking or warping due to heating.

[0070] The interlayer film 30 can contain one or more additives, such as infrared absorbers, ultraviolet absorbers, colorants, fluorescent agents, adhesion modifiers, coupling agents, surfactants, antioxidants, heat stabilizers, light stabilizers, dehydrating agents, antifoaming agents, antistatic agents, and flame retardants. A colored layer containing a colorant can be used as a shade band layer to reduce glare from sunlight for vehicle occupants. The shade band layer may be provided in a strip shape along the top edge of the laminated glass when it is installed in a vehicle.

[0071] The total thickness of the interlayer film 30 is preferably 0.3 mm to 3.15 mm to ensure ease of handling. The thicknesses of the first interlayer film 31, the second interlayer film 32, and the third interlayer film 33 are each preferably 0.15 mm or more, more preferably 0.3 mm or more, to ensure penetration resistance. Furthermore, the thicknesses of the first interlayer film 31, the second interlayer film 32, and the third interlayer film 33 are each preferably 3 mm or less, more preferably 1.2 mm or less, and particularly preferably 0.8 mm or less, to accommodate weight restrictions on laminated glass. The thicknesses of the interlayer films may be the same or different.

[0072] <Functional layer> The functional layer 40 is an electrically driven layer that receives power from a power source via a power supply member. The electrically driven functional layer 40 may be a dimming layer, a light-emitting layer, an electric heating layer, or the like. The electrically driven portion of the functional layer 40 may be flat as a whole. On the other hand, for example, an infrared light-shielding coating film or an ultraviolet light-emitting resin film disposed between the first glass plate 10 and the second glass plate 20 may be flat as a whole, but are not electrically driven by themselves and are therefore not included in the functional layer.

[0073] Two or more functional layers 40 may be arranged. The two or more functional layers may have the same function or different functions. When two or more functional layers 40 are arranged, only one ESD shield 60 and one ground member 55 may be arranged, or two or more of each may be arranged.

[0074] The functional layer 40 may be DC-driven or AC-driven, but the drive voltage is less than 2 kV. Therefore, the drive current flowing through the first circuit does not flow through the second circuit, which includes a dielectric, during normal operation. The drive voltage of the functional layer 40 is typically 500 V or less, and is often operated at 200 V or less or 100 V or less, so that no current flows through the second circuit during normal operation of the functional layer 40. The drive voltage of the functional layer 40 may also be, for example, 1 V or more.

[0075] The light-controlling layer may have a function of changing the visible light transmittance by electrical actuation, and may also change color. Examples of the light-controlling layer include electrochromic (EC) film, liquid crystal (LC) film, suspended particle device (SPD) film, and electrokinetic (EK) film. The driving voltage of the light-controlling layer is about 50V to 200V. The light-controlling layer can also be used as a shade band.

[0076] The light-emitting layer may contain a material that emits light when electrically driven, and examples thereof include cold cathode fluorescent lamps (CCFLs), light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), lasers, and displays using these. The light-emitting layer can also be used as a display for indicating directions or calling attention. The driving voltage for the light-emitting layer is approximately 3V to 20V.

[0077] The electric heating layer may contain any material that generates heat when electrically driven, and may include at least one of a metal, a metal oxide, and a conductive polymer. The electric heating layer may have any shape, such as a thin film or a thin wire. Specifically, the electric heating layer may be an electric heating film for anti-fogging purposes or an electric heating wire for melting ice. Direct current is often used for the electric heating layer, and the driving voltage for the electric heating layer is approximately 5V to 30V.

[0078] <Grounding components and grounding wires> The insulating material of the grounding member 55 includes a thermosetting resin or a thermoplastic resin. Examples of the insulating material that can be used include polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyamide resins such as nylon 6, nylon 66, and nylon 610, polyimide resins such as polyimide, polyamideimide, and polyetherimide, fluorine-containing resins, polyethersulfone, polyetherketone, polyethersulfide, polyarylate, polyester ether, wholly aromatic polyamide, polyaramid, polypropylene (PP), polycarbonate (PC), and liquid crystal polymer resins.

[0079] Among these resins, polyimide-based resins such as polyimide, which can withstand the high temperature and high pressure conditions that occur during the production of laminated glass, are preferably used for the insulating member. However, the resin used for the insulating member is not particularly limited as long as it is a material that has insulating properties, flexibility, and heat resistance.

[0080] The shape of the grounding member 55 is not particularly limited, but may be, for example, strip-like or cylindrical. A strip-like grounding member 55 is more likely to have both flexibility and adhesiveness. The thickness or diameter (hereinafter simply referred to as "thickness") of the grounding member 55 is, for example, 30 μm or more, and preferably 50 μm or more. Furthermore, in order to prevent gaps from forming around the grounding member 55, the thickness of the grounding member 55 is preferably 600 μm or less, more preferably 400 μm or less, even more preferably 300 μm or less, and particularly preferably 100 μm or less.

[0081] The ground wire 56 is made of a metal such as gold, silver, or copper, with copper being preferred. The shape of the ground wire 56 is not particularly limited and may be strip-shaped or cylindrical to match the shape of the ground member 55. The thickness of the ground wire 56 depends on the type of functional layer 40, but is, for example, 10 μm or more. The thickness of the ground wire 56 is preferably 15 μm or more, more preferably 30 μm or more, because it corresponds to the functional layer 40 used in laminated glass and is easy to handle. Furthermore, the thickness of the ground wire 56 is preferably 150 μm or less because it prevents the ground member 55 from becoming excessively thick, more preferably 100 μm or less, and even more preferably 50 μm or less.

[0082] <Power supply components and power supply lines> The material forming the insulating member 53 included in the power supply member 50 can be the same resin as that used as the insulating member of the ground member 55. The insulating members 53 and 55 may be the same or different.

[0083] The material forming the power feed lines 51 and 52 may be the same as or different from the material forming the ground line 56. The material forming the power feed lines 51 and 52 may be the same as or different from the material forming the ground line 56.

[0084] <ESDシールド> The ESD shield 60 (61) is connected to a location with sufficiently low impedance, such as the vehicle body, via the grounding member 55. The ESD shield 60 (61) may also be connected to the ECU signal ground, which serves as a low-impedance location. However, if the ECU signal ground is not at the same potential as the vehicle body, it is preferable to ground the ECU signal ground to the vehicle body because the impedance of the ECU signal ground is higher than that of the vehicle body. The ESD shield 60 (61) is preferably made of a metal such as gold, silver, copper, or aluminum, with copper being preferred. Metals can be oxidized by components such as plasticizers contained in the interlayer film 30, resulting in a decrease in conductivity. Therefore, it is preferable that the ESD shield 60 (61) be covered with a coating so that the metal does not come into direct contact with the interlayer film 30. To prevent oxidation due to components in the interlayer film 30, the ESD shield 60 (61) may be made of a carbon material or a metal-carbon composite material.

[0085] The ESD shield 60 (61) must have a lower impedance (input impedance) than the functional layer 40. That is, for example, the ratio of the impedance of the ESD shield 60 (61) to the impedance of the functional layer 40 at 25°C and 8 MHz must be less than 1. Furthermore, to effectively conduct static electricity through the ESD shield 60 (61), this ratio is preferably 0.5 or less, more preferably 0.2 or less, even more preferably 0.1 or less, even more preferably 0.05 or less, and particularly preferably 0.03 or less. The lower limit of this ratio is not particularly limited, but may be, for example, 0.001.

[0086] To keep the impedance ratio within the above range, the impedance of the ESD shield 60 (61) is preferably 100 kΩ or less at 25°C and 8 MHz, although this depends on factors such as the capacitance of the dielectric. The lower limit of the impedance of the ESD shield 60 (61) is not particularly limited, but is, for example, 4 μΩ. The dielectric constant of the dielectric disposed in the second circuit may be, for example, 2.0 to 8.0 at 25°C, preferably 2.5 to 5.0, and more preferably 3.0 to 4.0. When this dielectric is composed of multiple materials, it is preferable that the dielectric constant of each material be within the range of 2.0 to 8.0.

[0087] The cross-sectional area of ​​the ESD shield 60 (61) is 0.003 mm to allow static electricity to flow effectively. 2 The above is preferable. There is no particular upper limit to the cross-sectional area of ​​the ESD shield 60 (61).

[0088] <Light-shielding part> When the laminated glass has a light-shielding portion 90, the laminated glass has an opening that overlaps with the first glass plate 10 in a plan view of the first glass plate 10 and does not have the light-shielding portion 90, thereby ensuring the driver's field of vision. The width of the light-shielding portion 90 is not particularly limited, but in order to ensure the area of ​​the opening, it is preferably 50 mm or less from the periphery of the first glass plate 10, more preferably 30 mm or less, and particularly preferably 20 mm or less. Furthermore, in order to effectively conceal the contact points of each component, the width of the light-shielding portion 90 is preferably 5 mm or more from the periphery of the laminated glass.

[0089] Examples of materials that can form the light-shielding portion 90 include organic ink, inorganic ceramics, and colored interlayer films. The light-shielding portion 90 can be formed, for example, by applying organic ink or inorganic ceramics to a glass surface by screen printing or the like and then drying it. The color of the light-shielding portion 90 may be any color as long as it can block visible light to an extent that can conceal at least the portion that needs to be concealed. However, dark colors such as black, brown, gray, and dark blue are preferred, and black is more preferred.

[0090] 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. The entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2021-056125, filed on March 29, 2021, are hereby incorporated by reference as part of the disclosure of the specification of the present invention. [Explanation of symbols]

[0091] 100, 200 laminated glass 10 First glass plate 10a First principal surface 10b Second principal surface 20 Second glass plate 20c 3rd principal surface 20d Fourth principal surface 30 Interlayer 31 First interlayer 32 Second interlayer 33 Third interlayer 40 Functional Layers 50 Power supply member 51, 52 feeder line 53 Insulating materials 55 Grounding material 56 Ground Line 60, 61 ESD shield 90, 91, 92 Light blocking section G center of gravity

Claims

1. a first glass plate, an interlayer film, and a second glass plate are laminated in this order; The intermediate film has an electrically driven functional layer and a power supply member electrically connected to the functional layer; a first circuit in which the power supply member and the functional layer are connected in series; a second circuit including the power supply member, a flexible ESD shield, and a ground member connected in series; the second circuit has a dielectric at at least one location within the second circuit; The ground member is grounded, the power supply member has a first power supply line and a second power supply line, and the ESD shield overlaps with a part of an end portion of the first glass plate where the first power supply line and the second power supply line are connected to the functional layer in a plan view of the first glass plate.

2. The laminated glass for a vehicle with an earth structure according to claim 1 , wherein the dielectric is disposed between the power supply member and the ESD shield.

3. 3. The laminated glass for a vehicle with an earth structure according to claim 1, wherein the dielectric is disposed between the ESD shield and the ground member.

4. The laminated glass for a vehicle with an earthing structure according to any one of claims 1 to 3, wherein at least a portion of the dielectric material includes the interlayer film.

5. At least one of the power supply member, the ESD shield, and the ground member has an insulating member, The laminated glass for a vehicle with an earthing structure according to any one of claims 1 to 4, wherein at least a portion of the dielectric material includes the insulating member.

6. At least one of the power supply member, the ESD shield, and the ground member has an insulating member, the dielectric includes at least a portion of the intermediate film and the insulating member, 4. The laminated glass for vehicles with an earthing structure according to claim 1, wherein the minimum non-breakdown voltage of the interlayer film is lower than the minimum non-breakdown voltage of the insulating member.

7. A laminated glass for vehicles with an earthed structure as described in any one of claims 1 to 6, wherein, in a planar view of the first glass plate, the power supply member and the ground member are arranged at a distance from each other, and form the second circuit connected in series, including the ESD shield arranged on the functional layer.

8. 8. The laminated glass for a vehicle with an earth structure according to claim 1, wherein the minimum non-breakdown voltage of the dielectric is 0.5 kV / mm or more and 500 kV / mm or less.

9. 9. The laminated glass for a vehicle with an earthing structure according to claim 1, wherein a value obtained by multiplying a distance [mm] between the first end and the second end of the dielectric in the second circuit by a minimum non-breakdown voltage [kV / mm] of the dielectric is 2 kV or less.

10. The laminated glass for a vehicle with an earthing structure according to any one of claims 1 to 9, wherein the dielectric has a relative dielectric constant of 2.0 to 8.

0.

11. The laminated glass for a vehicle with an earth structure according to any one of claims 1 to 10, wherein the ESD shield has a lower impedance than the functional layer.

12. 12. The laminated glass for a vehicle with an earth structure according to claim 11, wherein a ratio of an impedance of the ESD shield to an impedance of the functional layer is 0.5 or less.

13. a light-shielding portion on the periphery of the first glass plate in a plan view; The laminated glass for a vehicle with an earth structure according to any one of claims 1 to 12, wherein the ESD shield overlaps with the light-shielding portion.

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