JP2020164397A - Glass laminate - Google Patents

Abstract

To provide a glass laminate capable of improving the information acquisition performance of a sensor and also capable of correctly having an out-of-door landscape or information indicated by HUD (head-up display) in user's sights in an information acquisition area provided to the glass laminate having a wedge shape in a cross section.SOLUTION: A glass laminate has an interlayer between vehicle outside and inside glass plates and has an information acquisition area and a test area A. The information acquisition area is located at the upper side of the test area A when installing the glass laminate to the vehicle, and at least a part of the peripheral part of the information acquisition area is surrounded by an insulation layer comprising a colored ceramic layer in a plane view. In either one of the outside and inside glass plates, the plate of an upper end is thicker than that of a lower end when installing the glass laminate to the vehicle. Besides, the ratio of a degree in plate thickness difference, α/β, is 1.01 or more when defining the degree of plate thickness difference in the information acquisition area as α, and that degree in the test area A as β.SELECTED DRAWING: Figure 5

Description

The present invention relates to laminated glass.

In recent years, the introduction of a head-up display (hereinafter, also referred to as HUD) that reflects an image on the windshield of a vehicle to display predetermined information in the driver's field of vision has been promoted, but the driver can see the scenery outside the vehicle or the HUD. When visually recognizing the information displayed by the above, a double image such as a transparent double image and a reflected double image may become a problem. Therefore, in the HUD, in order to solve the problem of the double image, a laminated glass having a wedge-shaped cross section is adopted as the windshield (see, for example, Patent Document 1).

On the other hand, a sensor such as a camera may be installed in the vehicle, for example, inside the windshield in order to recognize the state of the outside world. In such a case, an information acquisition area for a sensor such as a camera to acquire information is provided on a part of the windshield, but if the fluoroscopic distortion in the information acquisition area is large, the information acquisition performance of the sensor such as a camera deteriorates. Let me. In particular, when a shielding layer made of a colored ceramic layer is formed around the information acquisition region, fluoroscopic distortion is likely to occur during windshield molding due to the difference in ease of heat absorption between the colored ceramic and the glass.

Even when an information acquisition area surrounded by a shielding layer is provided on a laminated glass having a wedge-shaped cross section, a technique for not deteriorating the information acquisition performance of the sensor is required. It is also required that the scenery outside the vehicle and the information displayed by the HUD can be accurately visually recognized.

Japanese Patent Application Laid-Open No. 07-175007

The present invention has been made in view of the above points, and improves the information acquisition performance of the sensor in the information acquisition region provided on the laminated glass having a wedge-shaped cross section, and at the same time, the scenery outside the vehicle. The purpose is that the information displayed by the or HUD can be accurately visually recognized.

This laminated glass is a laminated glass having an interlayer film between the outer glass plate of the vehicle and the inner glass plate of the vehicle, and has an information acquisition region by a sensor and a test region A defined by JIS standard R3212 (2015). The information acquisition region is located above the test region A when the laminated glass is attached to the vehicle, and at least a part of the peripheral edge of the information acquisition region is composed of a colored ceramic layer in a plan view. It is surrounded by a shielding layer, and one of the vehicle outer glass plate and the vehicle inner glass plate is thicker at the upper end portion than at the lower end portion when the laminated glass is attached to the vehicle. When the degree of difference in thickness of the information acquisition region is α and the degree of difference in thickness of the test area A is β, it is required that the ratio α / β of the degree of difference in thickness is 1.01 or more.

However, α is the ratio of the thickness of the glass plate on the outside of the vehicle to the glass plate on the inside of the vehicle in the center of gravity of the information acquisition region (the smaller plate thickness is the denominator), and β is the outside of the vehicle in the center of gravity of the test region A. It is the ratio of the thickness of the glass plate to the glass plate inside the car (the smaller one is the denominator).

According to one embodiment of the disclosure, in the information acquisition region provided on the laminated glass having a wedge-shaped cross section, the information acquisition performance of the sensor is improved, and at the same time, the scenery outside the vehicle and the information displayed by the HUD are accurate. Can be visually recognized.

It is a figure which illustrates the windshield for the vehicle which concerns on 1st Embodiment. It is a partial cross-sectional view of the windshield 20 shown in FIG. 1 cut in the XZ direction and viewed from the Y direction. It is a partially enlarged view near the information acquisition area which concerns on the modification of the 1st Embodiment. It is a figure (the 1) explaining an Example and a comparative example. It is a figure (the 2) explaining an Example and a comparative example.

Hereinafter, modes for carrying out the invention will be described with reference to the drawings. In each drawing, the same components may be designated by the same reference numerals and duplicate description may be omitted. Although the windshield for vehicles will be described as an example here, the laminated glass according to the present embodiment is not limited to this, and is applied to, for example, side glass, rear glass, etc. other than the windshield for vehicles. It is possible. Further, in the figure, the size and shape are partially exaggerated so that the content of the present invention can be easily understood.

The plan view refers to viewing a predetermined region of the windshield from the normal direction of the predetermined region, and the planar shape refers to the shape of the predetermined region of the windshield viewed from the normal direction of the predetermined region. ..

<First Embodiment>
FIG. 1 is a diagram illustrating a windshield for a vehicle according to the first embodiment, and FIG. 1A is a diagram schematically showing a state in which the windshield is visually recognized from the inside of the vehicle to the outside of the vehicle. (The windshield 20 is attached to the vehicle with the Z direction facing upward). FIG. 1B is a partially enlarged cross-sectional view of the vicinity of the information acquisition region 25 of FIG. 1A. In FIG. 1B, the camera 300 is shown together with the windshield 20 for convenience.

As shown in FIG. 1, the windshield 20 has a test area A and an information acquisition area 25 defined by JIS standard R3212 (2015). Further, a shielding layer 27 is provided on the peripheral edge of the windshield 20. The test area A is located inside the area surrounded by the shielding layer 27 in a plan view, and the information acquisition area 25 is located in the opening provided in the shielding layer 27. The information acquisition area 25 is located above the test area A because it does not obstruct the driver's field of vision when the windshield 20 is attached to the vehicle and is advantageous for information acquisition.

The planar shape of the information acquisition region 25 is, for example, a rectangle, an isosceles trapezoid, or a fan shape. The area of the portion of the information acquisition region 25 surrounded by the shielding layer 27 is, for example, 1500 mm ² or more per opening. By setting the area of the portion of the information acquisition region 25 surrounded by the shielding layer 27 to 1500 mm ² or more, the angle of view required for information acquisition of the sensor such as the camera 300 can be secured. The area of the opening of the shielding layer 27 information acquisition region 25 is positioned, 3000 mm ² or more, 4500 mm ² or more, 6000 mm ² or more, may be 9000 mm ² or more.

Further, there may be a plurality of information acquisition areas 25. For example, there are separate information acquisition areas compatible with visible light cameras, information acquisition areas compatible with infrared sensors, and the like. In that case, the above-mentioned area is the area for each information acquisition area. When the information acquisition area 25 is not surrounded by the shielding layer 27, the area of the windshield 20 corresponding to the angle of view of the camera or the like is defined as the information acquisition area 25.

The information acquisition region 25 functions as a perspective region when the camera 300 as a sensor for acquiring visible light or infrared light is arranged on the upper peripheral edge of the windshield 20. However, the camera 300 is arranged as an example, and when a sensor for acquiring visible light is arranged instead of the camera 300, an information acquisition area 25 capable of acquiring visible light is also provided. Examples of the sensor that acquires visible light include an illuminance sensor. Examples of cameras that acquire infrared rays include night vision and LiDAR (Light Detection and Ranging).

The angle θ formed by the optical axis O of the camera 300 and the inner surface 21 of the windshield 20 is, for example, 60 deg or less. θ may be 50 deg or less, 40 deg or less, 30 deg or less, 25 deg or less, but the smaller the value of θ, the more likely it is that fluoroscopic distortion will occur, and the effect of the present invention will be further exhibited.

The shielding layer 27 is an opaque (for example, black) colored ceramic layer, and can be formed, for example, by applying a printing ink of a predetermined color to a glass surface and baking it. Due to the presence of the opaque shielding layer 27 on the peripheral edge of the windshield 20, a resin such as urethane that holds the peripheral edge of the windshield 20 on the vehicle body and a bracket that locks a sensor such as the camera 300 are attached to the windshield. It is possible to prevent the adhesive member to be attached from being deteriorated by ultraviolet rays. Further, it is possible to prevent the sensor from malfunctioning due to external light such as sunlight.

FIG. 2 is a partial cross-sectional view of the windshield 20 shown in FIG. 1 cut in the XZ direction and viewed from the Y direction. As shown in FIG. 2A, the windshield 20 is a laminated glass for a vehicle provided with a glass plate 210 which is a glass plate inside the vehicle, a glass plate 220 which is a glass plate outside the vehicle, and an interlayer film 230. is there. In the windshield 20, the glass plate 210 and the glass plate 220 are fixed with the interlayer film 230 sandwiched between them. The interlayer film 230 may be formed from a plurality of layers of interlayer films.

Although the shielding layer 27 is not shown in FIG. 2A, the shielding layer 27 may be provided on the car inside surface (inner surface 21 of the windshield 20) of the glass plate 210, or the car of the glass plate 220. It may be provided on the inner surface or on both of these surfaces. That is, the shielding layer 27 can be provided on one or both of the car-inside surface of the glass plate 210 and the car-inside surface of the glass plate 220.

The windshield 20 may have a HUD display area used in the HUD inside the test area A or outside the test area A and surrounded by the shielding layer 27 in a plan view. The HUD display area is a display area for displaying information by reflecting a projected image from the inside of the vehicle. The HUD display area is a range in which the mirrors constituting the HUD arranged in the vehicle are rotated and the windshield 20 is irradiated with the light from the mirrors constituting the HUD when viewed from the V1 point of JIS R3212.

In the windshield 20, the inner surface 21 of the windshield 20 which is one surface of the glass plate 210 which is the inside of the vehicle and the outer surface 22 of the windshield 20 which is one surface of the glass plate 220 which is the outside of the vehicle are It may be a flat surface or a curved surface.

The windshield 20 is formed in a wedge shape with a cross section whose thickness increases from the lower end side to the upper end side of the windshield 20 when the windshield 20 is attached to the vehicle, and the wedge angle is δ. With such a configuration, the double image of the HUD can be suppressed. The wedge angle δ is the difference between the thickness of the lower end in the vertical direction along the windshield 20 and the thickness of the upper end divided by the vertical distance along the windshield 20 (that is, the average wedge angle). is there. Hereinafter, the wedge angles of the glass plate and the interlayer film are also determined as described above. The increase in the thickness from the lower end side to the upper end side of the windshield 20 may be a monotonous increase in which the rate of increase is constant, or the rate of increase may be partially changed.

The wedge angle δ is preferably 0.1 mrad or more and 1.0 mrad or less. By setting the wedge angle δ to 0.1 mrad or more, it becomes easy to make the degree of different thickness of the present invention a sufficiently large value, and the perspective double image can be sufficiently reduced while suppressing the HUD double image. Further, by setting the wedge angle δ to 1.0 mrad or less, an increase in the mass of the windshield 20 can be suppressed within a range that does not cause a problem. The wedge angle δ is more preferably 0.1 mrad or more and 0.9 mrad or less, further preferably 0.1 mrad or more and 0.8 mrad or less, and further preferably 0.1 mrad or more and 0.6 mrad or less.

In the windshield 20, when the windshield 20 is attached to the vehicle, the upper end portion of the glass plate 220 is thicker than the lower end portion, and the difference in plate thickness between the lower end portion and the upper end portion is 0.1 mm or more. Is preferable. That is, the glass plate 220 is formed in a wedge shape in cross section in which the plate thickness increases from the lower end side to the upper end side of the windshield 20 when the windshield 20 is attached to the vehicle. The difference in plate thickness between the lower end and the upper end of the glass plate 220 is preferably 1.0 mm or less. By setting the difference in plate thickness between the lower end and the upper end of the glass plate 220 to 1.0 mm or less, it is possible to suppress an excessive increase in mass of the laminated glass.

The wedge angle of the glass plate 220, that is, the angle formed by the surface serving as the outer surface 22 of the windshield 20 and the surface in contact with the interlayer film 230 is δg. In FIG. 2A, since the thicknesses of the glass plate 210 and the interlayer film 230 are uniform, the wedge angle δg of the glass plate 220 is the wedge angle of the entire laminated glass formed by the inner surface 21 and the outer surface 22 of the windshield 20. Equal to δ.

Although FIG. 2A shows an example in which the glass plate 220 on the outside of the vehicle has a wedge shape in cross section, the glass plate 210 on the inside of the vehicle may have a wedge shape in cross section as shown in FIG. 2B. That is, the thickness of the glass plate 220 and the interlayer film 230 is made uniform, and when the glass plate 210 is attached to the vehicle with the windshield 20, the upper end portion is thicker than the lower end portion, and the lower end portion and the upper end portion are formed. The difference in plate thickness may be 0.1 mm or more. The difference in plate thickness between the lower end and the upper end of the glass plate 210 is preferably 1.0 mm or less. By setting the difference in plate thickness between the lower end and the upper end of the glass plate 210 to 1.0 mm or less, it is possible to suppress an excessive increase in mass of the laminated glass. Both the glass plate 210 and the glass plate 220 may have the above-mentioned wedge shape in cross section.

When the glass plates 210 and 220 have a wedge shape in cross section, the wedge angle δg is preferably 0.1 mrad or more and 1.0 mrad or less, more preferably 0.1 mrad or more and 0.9 mrad or less, and 0.1 mrad or less. It is more preferably 0.8 mrad or more, and further preferably 0.1 mrad or more and 0.6 mrad or less. If either the glass plate 210 or 220 has a wedge shape in cross section, the interlayer film 230 may have a wedge shape in cross section.

The glass plates 210 and 220 can be manufactured, for example, by the float method. When the glass plate 210 or the glass plate 220 is manufactured by the float method, it can be formed into a wedge shape in cross section by devising the manufacturing conditions. That is, by adjusting the peripheral speeds of a plurality of rolls arranged at both ends of the glass ribbon traveling on the molten metal in the width direction, the glass cross section in the width direction can be made concave, convex, or tapered. The part having a change in thickness may be cut out. Further, after the flat glass is manufactured by a predetermined method, the surface may be polished to form a wedge-shaped cross section.

As the glass plates 210 and 220, for example, soda lime glass, aluminosilicate glass, non-alkali glass, organic glass and the like, which are inorganic glasses, can be used. When the glass plate 210 or 220 is inorganic glass, it may or may not be strengthened. If it is strengthened, it will be strengthened by wind cooling or chemical strengthening.

The thickness of the glass plate 220 located on the outside of the windshield 20 is preferably 1.8 mm or more and 3 mm or less at the thinnest portion. When the thickness of the glass plate 220 is 1.8 mm or more, the strength such as stepping stone resistance is sufficient, and when it is 3 mm or less, the mass of the laminated glass does not become too large, which is preferable in terms of fuel efficiency of the vehicle. The thinnest portion of the glass plate 220 is more preferably 1.8 mm or more and 2.8 mm or less, and further preferably 1.8 mm or more and 2.6 mm or less.

The thickness of the glass plate 210 located inside the windshield 20 is preferably 0.3 mm or more and 2.3 mm or less. When the thickness of the glass plate 210 is 0.3 mm or more, the handleability is good, and when it is 2.3 mm or less, the mass of the windshield 20 does not become too large.

By setting the plate thickness of the glass plate 210 to 0.3 mm or more and 2.3 mm or less, the glass quality (for example, residual stress) can be maintained. Setting the plate thickness of the glass plate 210 to 0.3 mm or more and 2.3 mm or less is particularly effective for maintaining the glass quality (for example, residual stress) in deeply bent glass. From the viewpoint of the balance between mass and strength, the thickness of the glass plate 210 is more preferably 0.5 mm or more and 2.1 mm or less, and further preferably 0.7 mm or more and 1.9 mm or less.

When the windshield 20 has a curved shape, the glass plates 210 and 220 are bent and molded after being molded by the float method or the like and before being bonded by the interlayer film 230. Bending molding is performed by softening the glass by heating. The heating temperature of the glass during bending is approximately 550 ° C to 700 ° C.

A thermoplastic resin can be used as the interlayer film 230 for adhering the glass plate 210 and the glass plate 220. For example, plasticized polyvinyl acetal resin, plasticized polyvinyl chloride resin, saturated polyester resin, plasticized saturated polyester resin, polyurethane resin, plasticized polyurethane resin, ethylene-vinyl acetate copolymer resin, ethylene- Examples thereof include thermoplastic resins conventionally used for this type of application, such as ethyl acrylate copolymer resin. Further, the resin composition containing the modified block copolymer hydride described in Japanese Patent No. 6065221 can also be preferably used.

Among these, plasticized polyvinyl acetal-based resins have an excellent balance of various performances such as transparency, weather resistance, strength, adhesive strength, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation. Can be preferably used. These thermoplastic resins may be used alone or in combination of two or more. "Plasticization" in the plasticized polyvinyl acetal-based resin means that it is plasticized by adding a plasticizer. The same applies to other plasticized resins.

The polyvinyl acetal resin is a polyvinyl formal resin obtained by reacting polyvinyl alcohol (hereinafter, may also be referred to as “PVA” if necessary) with formaldehyde, and a narrow sense obtained by reacting PVA with acetaldehyde. Polyvinyl butyral resin obtained by reacting PVA with n-butylaldehyde (hereinafter, may be referred to as "PVB" if necessary), etc., and in particular, transparency and weather resistance. PVB is preferable because it has an excellent balance of various performances such as strength, adhesive strength, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation. These polyvinyl acetal-based resins may be used alone or in combination of two or more. However, the material forming the interlayer film 230 is not limited to the thermoplastic resin. The film thickness of the interlayer film 230 is preferably 0.5 mm or more at the thinnest portion. When the film thickness of the interlayer film 230 is 0.5 mm or more, the penetration resistance required for the windshield is sufficient. Further, the film thickness of the interlayer film 230 is preferably 3 mm or less at the thickest portion. When the maximum film thickness of the interlayer film 230 is 3 mm or less, the mass of the laminated glass does not become too large. The maximum value of the interlayer film 230 is more preferably 2.8 mm or less, further preferably 2.6 mm or less, further preferably 2 mm or less, further preferably 1 mm or less.

The interlayer film 230 may have three or more layers. For example, the sound insulation of the laminated glass can be improved by forming the interlayer film from three layers and lowering the hardness of the middle layer to be lower than the hardness of both outer layers by adjusting a plasticizer or the like. In this case, the hardness of both outer layers may be the same or different.

In order to produce the interlayer film 230, for example, the above resin material to be an interlayer film is appropriately selected and extruded in a heat-melted state using an extruder. The extrusion conditions such as the extrusion speed of the extruder are set to be uniform. After that, the interlayer film 230 is completed by extending the extruded resin film, for example, as necessary, in order to give curvature to the upper side and the lower side according to the design of the windshield 20.

In order to manufacture laminated glass, an interlayer film 230 is sandwiched between a glass plate 210 and a glass plate 220 to form a laminate. For example, this laminate is placed in a rubber bag and placed in a vacuum of −65 to -100 kPa. Adhere at a temperature of about 70 to 110 ° C.

Further, for example, by performing a pressure bonding treatment of heating and pressurizing under the conditions of 100 to 150 ° C. and a pressure of 0.6 to 1.3 MPa, a laminated glass having more excellent durability can be obtained. However, in some cases, this heating and pressurizing step may not be used in consideration of the simplification of the step and the characteristics of the material to be sealed in the laminated glass.

Between the glass plate 210 and the glass plate 220, in addition to the interlayer film 230, infrared reflection, light emission, power generation, dimming, visible light reflection, scattering, decoration, absorption, etc., as long as the effects of the present application are not impaired. It may have a functional film or device. Further, a functional film such as anti-fog and heat shield may be provided on the inner surface 21, or a film having a heat shield function may be provided on the inner side surface of the glass plate 220 or the outer surface of the glass plate 210. Good.

The FOV (Field Of View) of the HUD is, for example, 4 deg × 1 deg or more. The FOV of the HUD may be 5 deg × 1.5 deg or more, 6 deg × 2 deg or more, and 7 deg × 3 deg or more.

As described above, in the windshield 20, when any one of the glass plates 210 and 220 is attached to the vehicle, the cross-sectional wedge whose thickness increases from the lower end side to the upper end side of the windshield 20. It is formed in a shape. In other words, the difference in plate thickness between the lower end portion and the upper end portion of any one of the glass plates 210 and 220 is 0.1 mm or more.

In the present invention, the test area A on the lower side and the information acquisition area 25 on the upper side when the windshield 20 is attached to the vehicle have different thicknesses. Here, the degree of difference in thickness in the present specification is the ratio of the thickness of the glass plate 210 to the glass plate 220 at the center of gravity of the target region, for example, the information acquisition region 25 or the test region A. However, the smaller plate thickness at the center of gravity is used as the denominator. Here, the center of gravity of the target region in the present specification means the center of gravity based on the surface area of the target region of the outer surface 22 of the windshield 20.

In the windshield 20, when the degree of difference in thickness of the information acquisition region 25 is α and the degree of difference in thickness of the test area A is β, the degree of difference in thickness α is set to a value larger than the degree of difference in thickness β.

Generally, since glass for vehicles has a curved surface, if the difference in plate thickness between the glass plate 210 and the glass plate 220 becomes large, how the glass plate 210 and the glass plate 220 bend during bending molding when the windshield 20 is manufactured. Due to the difference in the above, fluoroscopic distortion is likely to occur when laminated glass is used. In other words, by reducing the difference in plate thickness (degree of difference in thickness) between the glass plate 210 and the glass plate 220, how the glass plate 210 and the glass plate 220 are bent during bending molding when the windshield 20 is manufactured. The difference is small, and the occurrence of fluoroscopic distortion can be suppressed. In particular, the effect of the present invention is even higher when the radius of curvature of the center of gravity of the information acquisition region 25 in the vertical direction is 20000 mm or less and the radius of curvature of the center of gravity of the test region A in the vertical direction is 20000 mm or less.

However, the inventors have found that the tendency that the smaller the degree of difference in thickness can suppress the occurrence of fluoroscopic distortion applies to the test area A, but does not apply to the information acquisition area 25. That is, the inventors have found that, unlike the test area A, the information acquisition area 25 tends to suppress the occurrence of fluoroscopic distortion when the degree of difference in thickness is large. It is considered that the information acquisition region 25 is affected by the presence of the shielding layer 27 made of a colored ceramic layer around the test region A, unlike the test region A.

In the windshield 20, α and β are set so that the ratio α / β of the degree of different thickness is 1.01 or more. In the range where the ratio α / β of the different thickness degree is 1.01 or more, the different thickness degree α of the information acquisition region 25 is preferably 1.1 or more, more preferably 1.15 or more. It is more preferably 1.2 or more. If the degree of difference α of the information acquisition region 25 is within the above range, the fluoroscopic distortion of the information acquisition region 25 can be sufficiently suppressed. The degree of difference α of the information acquisition region 25 is preferably 2 or less from the viewpoint of moldability when two glass plates are laminated into glass.

Further, the degree of difference β of the test region A is preferably less than 1.25, and more preferably less than 1.2. When the degree of difference β of the test region A is within the above range, the moldability when combining two glass plates into laminated glass is good. Further, since the difference thickness α of the information acquisition region 25 can be within a predetermined range without excessively increasing the wedge angle of the glass plate, the difference thickness β of the test area A is preferably 1.01 or more.

By setting the ratio α / β of the degree of different thickness to 1.01 or more, it is possible to suppress both the fluoroscopic distortion in the test region A and the fluoroscopic distortion in the information acquisition region 25. The value of 1.01 of the ratio α / β of the degree of different thickness is based on the actually measured value obtained as a result of repeated studies by the inventors (see Examples described later).

The ratio α / β of the degree of different thickness is preferably 1.02 or more, more preferably 1.03 or more, further preferably 1.035 or more, and particularly preferably 1.04 or more. preferable. This is because the larger the value of the ratio α / β of the degree of different thickness, the more the fluoroscopic distortion in the test region A can be suppressed and the fluoroscopic distortion in the information acquisition region 25 can be further suppressed. When the ratio α / β of the degree of difference in thickness is 2 or less, it is not necessary to excessively increase the wedge angle of one of the glass plates 210 or 220, and the glass plate having the wedge angle is manufactured without causing problems such as distortion. It is preferable because it can be done.

The smaller the value of the angle θ formed by the optical axis O of the camera 300 and the inner surface 21 of the windshield 20, the more the fluoroscopic distortion when viewed from the camera 300 is emphasized. Therefore, the ratio α / β of the degree of different thickness is set. The significance of setting it to 1.01 or higher becomes even higher. It is preferable that θ is 30 deg or less and the ratio α / β of the degree of different thickness is 1.02 or more, and it is more preferable that θ is 25 deg or less and the ratio α / β of the degree of different thickness is 1.03 or more.

<Modified example of the first embodiment>
In the modified example of the first embodiment, an example in which the shape of the information acquisition region is different from that of the first embodiment is shown. In the modified example of the first embodiment, the description of the same component as that of the above-described embodiment may be omitted.

FIG. 3 is a partially enlarged view of the vicinity of the information acquisition region according to the modified example of the first embodiment. In the first embodiment, the entire peripheral edge portion of the information acquisition region 25 is surrounded by the shielding layer 27 in a plan view, but the present invention is not limited to this, and at least a part of the peripheral edge portion of the information acquisition region 25 is used. May be in the form of being surrounded by the shielding layer 27 in a plan view.

For example, as in the information acquisition area 25A shown in FIG. 3A and the information acquisition area 25B shown in FIG. 3B, a part of the peripheral edge portion is surrounded by the shielding layer 27, and the other portion of the peripheral edge portion is surrounded. The form may not be surrounded by the shielding layer 27. For example, the shielding layer 27 surrounding the entire peripheral edge of the information acquisition region 25 may be provided with a region in which the shielding layer 27 is discontinuous, such as a slit-shaped opening. As the center of gravity of the information acquisition region 25 in this case, the center of gravity of the region surrounded by connecting the ends of the openings with a straight line may be obtained. Further, when there are a plurality of information acquisition areas 25, the relationship of the present invention may be satisfied for each information acquisition area.

Further, in the first embodiment, the planar shape of the information acquisition region 25 is rectangular, but the present invention is not limited to this. For example, as in the information acquisition area 25A shown in FIG. 3A, the planar shape may be an isosceles trapezoid or another planar shape.

[Examples 1 to 4, comparative example]
Two glass plates, one for the outer plate (outer glass plate of the car) and the other for the inner plate (glass plate inside the car) when made into laminated glass, were prepared (commonly known as FL manufactured by AGC Inc.). The dimensions of both glass plates were an isosceles trapezoid in a plan view with an upper side of 1200 mm, a lower side of 1400 mm, and a height of 1000 mm. A colored ceramic layer as shown in FIG. 1A was formed on the inner side surface of the inner plate. The information acquisition region 25 is an isosceles trapezoidal opening having an upper side of 20 mm, a lower side of 80 mm, and a height of 80 mm in a plan view. The two glass plates were preliminarily bent so as to have a predetermined curvature. An interlayer film (PVB manufactured by Sekisui Chemical Co., Ltd., thickness 0.76 mm) was sandwiched between two glass plates, heated under vacuum and temporarily crimped, and then crimped by an autoclave treatment to prepare a windshield.

As described above, a windshield having the information acquisition region 25 and the test region A (see FIGS. 1 and 2) was prepared, and the fluoroscopic distortion of the information acquisition region 25 and the test region A was evaluated (Comparative Examples, Examples 1 to Examples). 4). By forming the outer plate into a wedge shape with different cross-sections having different wedge angles, in Comparative Examples, Examples 1 to 4, the information acquisition region 25 has a different thickness α, the test region A has a different thickness β, and different thicknesses. The thickness ratio α / β was set to a different value. The radius of curvature in the vertical direction of the position of the center of gravity of the information acquisition region was 2000 mm, and the radius of curvature in the vertical direction of the center of gravity of the test region A was 9000 mm.

Comparative Examples, the values of the different thickness α of the information acquisition region 25, the different thickness β of the test region A, and the ratio α / β of the different thickness in Examples 1 to 4, and the information acquisition region 25 and the test region The evaluation results of the maximum absolute value of the fluoroscopic distortion of A are summarized in FIGS. 4 and 5. The fluoroscopic distortion is expressed by the refractive power of the lens action of the laminated glass, where positive represents the action of a convex lens and negative represents the action of a concave lens, and the closer the value is to 0, the smaller the fluoroscopic distortion. The fluoroscopic strain was measured by a strain inspection device manufactured by ISRA VISION.

As shown in FIGS. 4 and 5, in the comparative example in which the ratio α / β of the degree of different thickness is 1.006, the fluoroscopic distortion in the test region A is good, but the fluoroscopic distortion in the information acquisition region 25 has an allowable value. Beyond. As a result of repeated studies by the inventors, the permissible value of fluoroscopic distortion is 140 [mdpt] or less in absolute value in both the information acquisition region 25 and the test region A.

On the other hand, Example 1 having a different thickness ratio α / β of 1.047, Example 2 having a different thickness ratio α / β of 1.035, and a different thickness ratio α / β In Example 3 which is 1.014 and Example 4 where the ratio α / β of the degree of different thickness is 1.025, the fluoroscopic distortion in the test region A is larger than that of the comparative example, but is within the allowable value range. .. Further, the fluoroscopic distortion of the information acquisition region 25 was smaller than that of the comparative example, and was within the allowable value range.

As described above, in the test region A, the larger the ratio α / β of the degree of different thickness tends to be the larger the fluoroscopic distortion (arrow M in FIG. 5), and in the information acquisition region 25, the ratio α / β of the degree of different thickness tends to be larger. The larger the value, the smaller the fluoroscopic distortion tends to be (arrow N in FIG. 5). Then, from FIG. 5, it can be seen that by setting the ratio α / β of the degree of different thickness to 1.01 or more, both the fluoroscopic distortion in the test region A and the fluoroscopic distortion in the information acquisition region 25 can be within the allowable values. ..

That is, in the laminated glass, by forming the inner plate or the outer plate into a wedge-shaped cross section and setting the ratio α / β of the degree of different thickness to 1.01 or more, the fluoroscopic distortion in the test region A and the fluoroscopic distortion in the information acquisition region 25 are eliminated. Both can be within the permissible range. Further, since the laminated glass has a wedge shape in cross section, a double image of the HUD can be suppressed.

Although the preferred embodiments and the like have been described in detail above, the embodiments are not limited to the above-described embodiments and the like, and various embodiments and the like described above are used without departing from the scope of the claims. Modifications and substitutions can be added.

20 Windshield 21 Inner surface 22 Outer surface 25, 25A, 25B Information acquisition area 27 Shielding layer 210, 220 Glass plate 230 Intermediate film 300 Camera

Claims (9)

Laminated glass having an interlayer film between the car outer glass plate and the car inner glass plate.
It has an information acquisition area by a sensor and a test area A defined by JIS standard R3212 (2015).
The information acquisition area is located above the test area A when the laminated glass is attached to the vehicle.
At least a part of the peripheral portion of the information acquisition region is surrounded by a shielding layer made of a colored ceramic layer in a plan view.
When the laminated glass is attached to the vehicle, the upper end portion of either the vehicle outer glass plate or the vehicle inner glass plate is thicker than the lower end portion.
A laminated glass having a different thickness ratio α / β of 1.01 or more, where α is the different thickness of the information acquisition region and β is the different thickness of the test region A.
However, α is the ratio of the thickness of the glass plate on the outside of the vehicle to the glass plate on the inside of the vehicle in the center of gravity of the information acquisition region (the smaller plate thickness is the denominator), and β is the outside of the vehicle in the center of gravity of the test region A. It is the ratio of the thickness of the glass plate to the glass plate inside the car (the smaller one is the denominator). The laminated glass according to claim 1, wherein the ratio α / β of the degree of different thickness is 1.03 or more. The laminated glass according to claim 1 or 2, wherein the different thickness α is 1.1 or more. The laminated glass according to any one of claims 1 to 3, wherein the different thickness β is less than 1.25. Of the car outer glass plate and the car inner glass plate, in the glass plate having a plate thickness difference of 0.1 mm or more between the lower end portion and the upper end portion, the plate thickness difference between the lower end portion and the upper end portion is 1. The laminated glass according to any one of claims 1 to 4, which is 0 mm or less. The laminated glass according to any one of claims 1 to 5, wherein the shielding layer is provided on one or both of the car inside surface of the car inside glass plate and the car inside surface of the car outside glass plate. .. The laminated glass according to any one of claims 1 to 6, wherein the entire peripheral edge portion of the information acquisition region is surrounded by the shielding layer in a plan view. The aspect according to any one of claims 1 to 6, wherein a part of the peripheral portion of the information acquisition region is surrounded by the shielding layer in a plan view, and the other portion of the peripheral portion is not surrounded by the shielding layer. Laminated glass. The laminated glass according to any one of claims 1 to 8, wherein the area of the portion of the information acquisition region surrounded by the shielding layer is 1500 mm ² or more.

Images