JP7259511B2 - laminated glass - Google Patents

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 field of view of the driver is progressing. Double images, such as perspective double images and reflected double images, may pose a problem when viewing information displayed by . Therefore, in order to solve the problem of double images in HUDs, laminated glass having a wedge-shaped cross-sectional portion is adopted for the windshield (see, for example, Patent Document 1).

On the other hand, there are cases where a sensor such as a camera is installed inside the windshield of a vehicle 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 in a part of the windshield. Let In particular, when a shielding layer made of a colored ceramic layer is formed around the information acquisition area, perspective distortion is likely to occur during molding of the windshield due to the difference in easiness of heat absorption between the colored ceramic and the glass.

There is a demand for a technique that does not deteriorate the information acquisition performance of a sensor even when an information acquisition area surrounded by a shielding layer is provided in laminated glass having a wedge-shaped cross-sectional portion. It is also required that the scenery outside the vehicle and the information displayed by the HUD can be accurately visually recognized.

JP-A-07-175007

The present invention has been made in view of the above points, and aims to improve the information acquisition performance of a sensor in an information acquisition area provided in a laminated glass having a wedge-shaped cross-sectional portion, and at the same time, to improve the information acquisition performance of a sensor, and at the same time, and the information displayed by the HUD can be accurately visually recognized.

This laminated glass is a laminated glass having an intermediate film between the vehicle-exterior glass plate and the vehicle-interior glass plate, and has an information acquisition area by a sensor and a test area A specified by JIS R3212 (2015). , the information acquisition area is located above the test area A when the laminated glass is attached to the vehicle, and at least a part of the peripheral edge of the information acquisition area is made of a colored ceramic layer in plan view. It is surrounded by a shielding layer, and when the laminated glass is attached to a vehicle, one of the vehicle-exterior glass plate and the vehicle-interior glass plate has a thickness greater at the upper end than at the lower end, When the degree of different thickness of the information acquisition region is α and the degree of different thickness of the test region A is β, the ratio α/β of the degree of different thickness is 1.01 or more, and the degree of different thickness β is 1.01 or more. Must be less than 25 .

where α is the thickness ratio of the vehicle-exterior glass plate and the vehicle-interior glass plate at the center of gravity of the information acquisition area (the smaller thickness is used as the denominator), and β is the vehicle-exterior side at the center of gravity of the test area A. It is the ratio of the plate thickness of the glass plate and the glass plate on the inside of the vehicle (the one with the smaller plate thickness is used as the denominator).

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

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates the windshield for vehicles which concerns on 1st Embodiment. 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; FIG. FIG. 11 is a partially enlarged view of the vicinity of the information acquisition area according to the modified example of the first embodiment; FIG. 2 is a diagram (Part 1) explaining an example and a comparative example; FIG. 2 is a diagram (part 2) explaining an example and a comparative example;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description may be omitted. Here, a vehicle windshield will be described as an example, but the invention is not limited to this, and the laminated glass according to the present embodiment can be applied to other than vehicle windshields, such as side glass and rear glass. It is possible. Also, in the drawings, the sizes and shapes are partially exaggerated so that the contents of the present invention can be easily understood.

Note that the term "planar view" refers to viewing a predetermined area of the windshield from the direction normal to the predetermined area, and the term "planar shape" refers to the shape of the predetermined area of the windshield viewed from the direction normal to the predetermined area. .

<First embodiment>
1A and 1B are diagrams illustrating a vehicle windshield according to the first embodiment, and FIG. 1A is a diagram schematically showing how the windshield is viewed 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. 1(b) is a partially enlarged sectional view near the information acquisition area 25 in FIG. 1(a). In addition, in FIG. 1B, the camera 300 is illustrated 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 R3212 (2015). A shielding layer 27 is provided on the periphery of the windshield 20 . The test area A is located inside the area surrounded by the shielding layer 27 in plan view, and the information acquisition area 25 is located within the opening provided in the shielding layer 27 . The information acquisition area 25 is located above the test area A because it does not hinder 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 area 25 is, for example, a rectangle, an isosceles trapezoid, or a sector. The area of the portion of the information acquisition area 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 by the sensor such as the camera 300 can be secured. The area of the opening of the shielding layer 27 where the information acquisition area 25 is located may be 3000 mm ² or more, 4500 mm ² or more, 6000 mm ² or more, or 9000 mm ^{2 or} more.

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

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

The angle θ between the optical axis O of the camera 300 and the inner surface 21 of the windshield 20 is, for example, 60 degrees or less. θ may be 50 degrees or less, 40 degrees or less, 30 degrees or less, or 25 degrees or less.

The shielding layer 27 is an opaque (for example, black) colored ceramic layer, and can be formed, for example, by applying printing ink of a predetermined color to the glass surface and baking it. Due to the presence of the opaque shielding layer 27 on the periphery of the windshield 20, a resin such as urethane that holds the periphery of the windshield 20 to the vehicle body and a bracket that locks the sensor such as the camera 300 are attached to the windshield. It is possible to suppress deterioration of the adhesive member to be attached due to ultraviolet rays. Furthermore, it is possible to prevent the sensor from malfunctioning due to outside 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. 2( a ), the windshield 20 is a laminated glass for a vehicle including a glass plate 210 that is an inner side glass plate, a glass plate 220 that is an outer side glass plate, and an intermediate film 230 . be. In the windshield 20, the glass plate 210 and the glass plate 220 are fixed with an intermediate film 230 sandwiched therebetween. The interlayer 230 may be formed from multiple layers of interlayers.

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

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

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

The windshield 20 is formed to have a wedge-shaped 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, it is possible to suppress the double image of the HUD. It should be noted that the wedge angle δ is the difference between the thickness of the lower edge and the thickness of the upper edge in the vertical direction along the windshield 20 divided by the vertical distance along the windshield 20 (i.e., the average wedge angle). be. Henceforth, the wedge angles of the glass plate and the interlayer are also determined as described above. The increase in 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 partially change.

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 set the degree of different thickness of the present invention to a sufficiently large value, and it is possible to sufficiently reduce perspective double images while suppressing HUD double images. Further, by setting the wedge angle δ to 1.0 mrad or less, the increase in the mass of the windshield 20 can be suppressed within a range that causes no problem. The wedge angle .delta.

In the windshield 20, the glass plate 220 is thicker at the upper end than at the lower end when the windshield 20 is attached to the vehicle, and the thickness difference between the lower end and the upper end is 0.1 mm or more. is preferred. That is, the glass plate 220 is formed to have a wedge-shaped 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. A difference in plate thickness between the lower end portion and the upper end portion of the glass plate 220 is preferably 1.0 mm or less. By setting the thickness difference between the lower end portion and the upper end portion of the glass plate 220 to 1.0 mm or less, an excessive increase in mass of the laminated glass can be suppressed.

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

2A shows an example in which the vehicle-exterior glass plate 220 has a wedge-shaped cross section, but as shown in FIG. 2B, the vehicle-interior glass plate 210 may have a wedge-shaped cross section. That is, the thickness of the glass plate 220 and the intermediate film 230 are made uniform, and when the windshield 20 is attached to the vehicle, the upper end of the glass plate 210 is thicker than the lower end, and the thickness between the lower end and the upper end is large. The plate thickness difference may be 0.1 mm or more. A difference in plate thickness between the lower end portion and the upper end portion of the glass plate 210 is preferably 1.0 mm or less. By setting the difference in plate thickness between the lower end portion and the upper end portion of the glass plate 210 to 1.0 mm or less, an excessive increase in mass of the laminated glass can be suppressed. Both the glass plate 210 and the glass plate 220 may have the above-described wedge-shaped cross-section.

When the glass plates 210 and 220 have a wedge-shaped 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. It is more preferably 0.8 mrad or less, and even more preferably 0.1 mrad or more and 0.6 mrad or less. If either one of the glass plates 210 or 220 has a wedge-shaped cross section, the intermediate film 230 may have a wedge-shaped cross section.

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 to have a wedge-shaped cross section by devising manufacturing conditions. That is, by adjusting the peripheral speed of a plurality of rolls arranged at both ends in the width direction of the glass ribbon traveling on the molten metal, the cross section of the glass in the width direction can be made concave, convex, or tapered. It suffices to cut out a portion having a thickness change. Alternatively, after the flat glass is manufactured by a predetermined method, the surface thereof may be polished to form a wedge-shaped cross section.

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

The thickness of the glass plate 220 located outside the windshield 20 is preferably 1.8 mm or more and 3 mm or less at the thinnest part. When the plate thickness of the glass plate 220 is 1.8 mm or more, the strength such as resistance to stepping stones is sufficient. The thickness of the glass plate 220 is more preferably 1.8 mm or more and 2.8 mm or less at the thinnest part, and still more preferably 1.8 mm or more and 2.6 mm or less.

The plate 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 glass plate 210 has a thickness of 0.3 mm or more, it is easy to handle.

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 in maintaining the glass quality (for example, residual stress) in deeply curved glass. From the point of balance between mass and strength, the plate thickness of the glass plate 210 is more preferably 0.5 mm or more and 2.1 mm or less, and still more preferably 0.7 mm or more and 1.9 mm or less.

When the windshield 20 has a curved shape, the glass sheets 210 and 220 are bent after forming by a float method or the like and before bonding with the intermediate film 230 . Bending is performed by softening the glass by heating. The heating temperature of the glass during bending is about 550.degree. C. to 700.degree.

A thermoplastic resin can be used as the intermediate film 230 that bonds the glass plate 210 and the glass plate 220 together. For example, plasticized polyvinyl acetal-based resin, plasticized polyvinyl chloride-based resin, saturated polyester-based resin, plasticized saturated polyester-based resin, polyurethane-based resin, plasticized polyurethane-based resin, ethylene-vinyl acetate copolymer-based resin, ethylene- Thermoplastic resins conventionally used for this type of application, such as ethyl acrylate copolymer resins, can be used. A resin composition containing a hydrogenated modified block copolymer described in Japanese Patent No. 6065221 can also be preferably used.

Among these, plasticized polyvinyl acetal resin is excellent in the balance of performance 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 above-mentioned plasticized polyvinyl acetal resin means plasticization by addition of a plasticizer. The same applies to other plasticizing resins.

Examples of the polyvinyl acetal-based resin include a polyvinyl formal resin obtained by reacting polyvinyl alcohol (hereinafter sometimes referred to as "PVA" as necessary) and formaldehyde, and a narrowly defined polyvinyl formal resin obtained by reacting PVA and acetaldehyde. Polyvinyl acetal resin, polyvinyl butyral resin obtained by reacting PVA and n-butyraldehyde (hereinafter sometimes referred to as "PVB"), etc., especially transparency, weather resistance , strength, adhesion, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation, PVB is suitable. These polyvinyl acetal-based resins may be used alone, or two or more of them may be used in combination. However, the material forming the intermediate film 230 is not limited to thermoplastic resin. The film thickness of the intermediate film 230 is preferably 0.5 mm or more at the thinnest part. When the film thickness of the intermediate film 230 is 0.5 mm or more, the penetration resistance necessary for the windshield is sufficient. Moreover, the film thickness of the intermediate film 230 is preferably 3 mm or less at the thickest part. When the maximum thickness of the intermediate film 230 is 3 mm or less, the mass of the laminated glass does not become too large. The maximum value of the intermediate film 230 is more preferably 2.8 mm or less, still more preferably 2.6 mm or less, still more preferably 2 mm or less, and even more preferably 1 mm or less.

Note that the intermediate film 230 may have three or more layers. For example, the interlayer film is composed of three layers, and the hardness of the middle layer is made lower than the hardness of both outer layers by adjusting the plasticizer or the like, thereby improving the sound insulation of the laminated glass. In this case, the hardness of both outer layers may be the same or different.

In order to produce the intermediate film 230, for example, the above-described resin material for the intermediate film is appropriately selected and extruded in a heated and melted state using an extruder. The extrusion conditions such as the extrusion speed of the extruder are set so as to be uniform. After that, the intermediate film 230 is completed by stretching the extruded resin film, for example, if necessary, in order to give curvature to the upper and lower sides in accordance with the design of the windshield 20. - 特許庁

In order to manufacture laminated glass, an intermediate film 230 is sandwiched between the glass plate 210 and the glass plate 220 to form a laminated body. at a temperature of about 70-110°C.

Furthermore, a laminated glass having more excellent durability can be obtained by carrying out a heat-pressing treatment under conditions of, for example, 100 to 150° C. and a pressure of 0.6 to 1.3 MPa. However, in some cases, this heating and pressurizing step may not be used in consideration of the simplification of the process and the characteristics of the material to be enclosed in the laminated glass.

Between the glass plate 210 and the glass plate 220, in addition to the intermediate film 230, infrared reflection, light emission, power generation, dimming, visible light reflection, scattering, decoration, absorption, etc. You may have films and devices with functions. In addition, the inner surface 21 may have a functional film for anti-fogging, heat shielding, etc., or a film having a heat shielding function may be provided on the inner surface of the glass plate 220 or the outer surface of the glass plate 210. good.

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

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

In the present invention, when the windshield 20 is attached to the vehicle, the test area A, which is the lower side, and the information acquisition area 25, which is the upper side, have different degrees of different thicknesses. Here, the degree of different thickness in the specification of the present application is the ratio of the plate thicknesses of the glass plate 210 and the glass plate 220 at the center of gravity of the target area, for example, the information acquisition area 25 and the test area 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 specification of the present application 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 α is the thickness difference of the information acquisition area 25 and β is the thickness difference of the test area A, the thickness difference α is set to a value larger than the thickness difference β.

In general, vehicle glass has a curved surface. Therefore, if the difference in thickness between the glass plate 210 and the glass plate 220 becomes large, the way in which the glass plates 210 and 220 are bent when the windshield 20 is manufactured is increased. Due to the difference in the thickness, perspective distortion tends 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, the bending manner of the glass plate 210 and the glass plate 220 at the time of bending when manufacturing the windshield 20 can be adjusted. The difference becomes small, and the occurrence of perspective distortion can be suppressed. In particular, when the vertical radius of curvature of the center of gravity of the information acquisition area 25 is 20,000 mm or less, and the vertical radius of curvature of the center of gravity of the test area A is 20,000 mm or less, the effects of the present invention are even greater.

However, the inventors have found that the tendency that perspective distortion can be suppressed when the degree of different thickness is small applies to the test area A but does not apply to the information acquisition area 25 . That is, unlike the test area A, the inventors found that the information acquisition area 25 tends to suppress the occurrence of perspective distortion when the degree of different thickness is large. It is considered that the information acquisition area 25, unlike the test area A, has a shielding layer 27 made of a colored ceramic layer around it.

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 degree of different thickness is 1.01 or more, the degree of different thickness 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 different thickness α of the information acquisition area 25 is within the above range, perspective distortion of the information acquisition area 25 can be sufficiently suppressed. The different thickness degree α of the information acquisition region 25 is preferably 2 or less from the viewpoint of formability when two glass plates are laminated into glass.

Further, the degree of different thickness β of the test region A is preferably less than 1.25, more preferably less than 1.2. If the degree of different thickness β of the test region A is within the above range, the formability is good when two glass sheets are laminated together. Further, since the thickness variation degree α of the information acquisition region 25 can be set within a predetermined range without excessively increasing the wedge angle of the glass plate, the thickness variation degree β of the test region A is preferably 1.01 or more.

By setting the ratio α/β of the degree of different thickness to 1.01 or more, both suppression of perspective distortion in the test area A and suppression of perspective distortion in the information acquisition area 25 can be achieved. The value of 1.01 for the ratio α/β of the degree of different thickness is based on actual measurement values obtained as a result of repeated studies by the inventors (see Examples below).

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

Note that the smaller the value of the angle θ between the optical axis O of the camera 300 and the inner surface 21 of the windshield 20, the more emphasized perspective distortion when viewed from the camera 300. The significance of 1.01 or more is further enhanced. When θ is 30 deg or less, the ratio α/β of the degree of different thickness is preferably 1.02 or more, and more preferably, when θ is 25 deg or less, the ratio α/β of the degree of different thickness is 1.03 or more.

<Modification of the first embodiment>
The modified example of the first embodiment shows an example in which the shape of the information acquisition area is different from that of the first embodiment. In addition, in the modified example of the first embodiment, the description of the same components as those of the already described embodiment may be omitted.

FIG. 3 is a partial enlarged view of the vicinity of the information acquisition area according to the modification of the first embodiment. In the first embodiment, the entire periphery 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 part of the periphery of the information acquisition region 25 may be surrounded by the shielding layer 27 in plan view.

For example, like the information acquisition area 25A shown in FIG. 3A and the information acquisition area 25B shown in FIG. A form not surrounded by the shielding layer 27 may be employed. For example, the shielding layer 27 surrounding the entire periphery of the information acquisition area 25 may be provided with a discontinuous area such as a slit-shaped opening. In this case, the center of gravity of the information acquisition area 25 can be obtained by finding the center of gravity of the area enclosed by connecting the ends of the opening with straight lines. Also, when there are a plurality of information acquisition areas 25, the relationship of the present invention may be satisfied for each information acquisition area.

Moreover, although the planar shape of the information acquisition area 25 is rectangular in the first embodiment, it is not limited to this. For example, like the information acquisition area 25A shown in FIG. 3A, the planar shape may be an isosceles trapezoid, or other planar shapes.

[Examples 1 to 4, Comparative Example]
Two glass plates (commonly known as FL manufactured by AGC Co., Ltd.) which will be an outer plate (vehicle-exterior glass plate) and an inner plate (vehicle-interior glass plate) when laminated glass were prepared. The dimensions of the two glass plates were an isosceles trapezoid in 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. 1(a) was formed on the inner side of the inner plate. The information acquisition area 25 was an isosceles trapezoidal opening with an upper side of 20 mm, a lower side of 80 mm, and a height of 80 mm in plan view. The two glass plates were bent in advance so as to have a predetermined curvature. An intermediate film (PVB manufactured by Sekisui Chemical Co., Ltd., thickness 0.76 mm) was sandwiched between two glass plates, heated under vacuum, temporarily pressure-bonded, and then pressure-bonded by autoclaving to prepare a windshield.

A windshield having the information acquisition area 25 and the test area A (see FIGS. 1 and 2) was produced as described above, and the perspective distortion of the information acquisition area 25 and the test area A was evaluated (comparative example, examples 1 to 1). 4). In addition, by making the outer plate into a cross-sectional wedge shape with different wedge angles, in the comparative example and Examples 1 to 4, the different thickness degree α of the information acquisition region 25, the different thickness degree β of the test region A, and the different thickness Different thickness ratios α/β were used. The vertical radius of curvature of the center of gravity of the information acquisition area was 2000 mm, and the vertical radius of curvature of the center of gravity of test area A was 9000 mm.

The values of the different thickness degree α of the information acquisition region 25, the different thickness degree β of the test region A, and the ratio α/β of the different thickness degrees, the information acquisition region 25 and the test region in the comparative example and Examples 1 to 4 The evaluation results of the maximum absolute value of the perspective distortion of A are summarized in FIGS. 4 and 5. FIG. The perspective distortion is expressed by the refractive power of the lens action of the laminated glass. Positive indicates the action of the convex lens, negative indicates the action of the concave lens, and the closer the value is to 0, the smaller the perspective distortion. The perspective strain was measured with a strain tester 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 perspective distortion of the test area A is good, but the perspective distortion of the information acquisition area 25 is below the allowable value. Beyond. As a result of repeated studies by the inventors, the permissible values of perspective distortion for both the information acquisition area 25 and the test area A are 140 [mdpt] or less in absolute value.

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

Thus, in the test area A, perspective distortion tends to increase as the thickness ratio α/β increases (arrow M in FIG. 5). There is a tendency for perspective distortion to decrease as the value increases (arrow N in FIG. 5). Further, from FIG. 5, it can be seen that the perspective distortion of the test area A and the perspective distortion of the information acquisition area 25 can both be within the allowable range by setting the ratio α/β of the degree of different thickness to 1.01 or more. .

That is, in the laminated glass, the perspective distortion of the test area A and the perspective distortion of the information acquisition area 25 are reduced by making the cross-sectional wedge shape of the inner plate or the outer plate and setting the ratio α/β of the degree of different thickness to 1.01 or more. Both can be within acceptable limits. In addition, since the laminated glass has a wedge-shaped cross section, double images on the HUD can be suppressed.

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

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 (8)

A laminated glass having an intermediate film between a vehicle-exterior glass plate and a vehicle-interior 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 part of the periphery of the information acquisition area is surrounded by a shielding layer made of a colored ceramic layer in plan view,
Either one of the vehicle-exterior glass plate and the vehicle-interior glass plate has a plate thickness greater at an upper end than at a lower end when the laminated glass is attached to a vehicle,
When the degree of different thickness of the information acquisition region is α and the degree of different thickness of the test region A is β, the ratio α/β of the degree of different thickness is 1.01 or more, and the degree of different thickness β is 1.01 or more. Laminated glass that is less than 25 .
where α is the thickness ratio of the vehicle-exterior glass plate and the vehicle-interior glass plate at the center of gravity of the information acquisition area (the smaller thickness is used as the denominator), and β is the vehicle-exterior side at the center of gravity of the test area A. It is the ratio of the plate thickness of the glass plate and the glass plate on the inside of the vehicle (the one with the smaller plate thickness is used as the denominator). 2. The laminated glass according to claim 1, wherein the ratio α/β of the degree of different thickness is 1.03 or more. 3. The laminated glass according to claim 1, wherein the different thickness degree α is 1.1 or more. Among the vehicle-exterior glass plate and the vehicle-interior glass plate, the difference in thickness between the lower end portion and the upper end portion of the glass plate is 0.1 mm or more, and the difference in plate thickness between the lower end portion and the upper end portion is 1.0 mm or more. The laminated glass according to any one of claims 1 to 3 , having a thickness of 0 mm or less. The laminated glass according to any one of claims 1 to 4 , wherein the shielding layer is provided on one or both of the vehicle-interior surface of the vehicle-interior glass plate and the vehicle-interior surface of the vehicle-exterior glass plate. . The laminated glass according to any one of claims 1 to 5 , wherein the entire periphery of the information acquisition area is surrounded by the shielding layer in plan view. 6. The method according to any one of claims 1 to 5 , wherein a part of the periphery of the information acquisition area is surrounded by the shielding layer in plan view, and the other part of the periphery is not surrounded by the shielding layer. laminated glass. The laminated glass according to any one of claims 1 to 7 , wherein the area of the portion of the information acquisition area surrounded by the shielding layer is 1500 mm2 ^or more.

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