JP2023061360A - Laminated glass and method for manufacturing the same - Google Patents

Abstract

To provide a method for manufacturing laminated glass which is less likely to generate a gap between an opening of an intermediate film and a resin film when the resin film is fitted into the opening.SOLUTION: A method for manufacturing laminated glass includes the steps of: manufacturing an intermediate film, and arranging the intermediate film between a first glass plate and a second glass plate and pressure-bonding them, wherein the step of manufacturing the intermediate film includes the steps of: forming an opening in a first resin film; cutting a second resin film into a shape having an area larger than that of the opening, and forming a third resin film; and fitting the third resin film into the opening.SELECTED DRAWING: Figure 9

Description

TECHNICAL FIELD The present invention relates to a laminated glass and a manufacturing method thereof.

2. Description of the Related Art In recent years, information devices using visible light or infrared light may be installed in the vicinity of laminated glass that serves as a windshield of a vehicle for purposes such as recognizing the state of the outside world. In such a case, a part of the laminated glass is provided with a sensor area for transmitting and/or receiving visible light or infrared light for the information device to acquire information outside the vehicle.

On the other hand, there is known a technique of using, for a windshield or the like, a laminated glass in which an infrared shielding material is added to an intermediate film to impart infrared shielding performance. The use of this technology improves heat shielding properties, which is preferable in terms of improving the comfort of passengers. may interfere with

In some cases, a so-called shade band in which a part of the intermediate film is colored is provided. In the shade band, the visible light transmittance of the sensor area is lowered, so that the information device can transmit and/or receive visible light. may interfere with

Therefore, as a countermeasure, in the intermediate film, a part with low visible light and infrared transmittance is hollowed out to form an opening corresponding to the sensor area, and a resin film with high visible light and infrared transmittance is formed in the opening. Fitting has been proposed (see Patent Literatures 1 and 2, for example).

Patent No. 4442863 Patent No. 4735121

In order to fit a resin film with high visible light and infrared transmittance into the opening formed in the part with low visible light and infrared transmittance in the interlayer film that has low visible light and infrared transmittance, visible It is necessary to cut out a resin film with high light and infrared transmittance. However, since the resin film has low dimensional stability, if the resin film is cut to have the same area as the opening, when the resin film is fitted into the opening, a gap is generated between the resin film and the opening. This gap becomes a cause of bubble residue in the pressure-bonding process when manufacturing the laminated glass and deterioration of see-through distortion in the vicinity of the opening of the laminated glass.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing laminated glass in which a gap is less likely to occur when a resin film is fitted into an opening of an intermediate film.

A method for manufacturing the laminated glass includes a step of producing an intermediate film, and a step of disposing and press-bonding the intermediate film between a first glass plate and a second glass plate, and producing the intermediate film. the step of forming an opening in a first resin film; cutting the second resin film into a shape having a larger area than the opening to form a third resin film; into the opening.

According to one embodiment of the disclosure, it is possible to provide a method for manufacturing laminated glass in which a gap is less likely to occur when a resin film is fitted into an opening of an intermediate film.

It is a figure which illustrates the laminated glass concerning 1st Embodiment. FIG. 3 is a plan view illustrating an intermediate film forming the laminated glass according to the first embodiment; FIG. 3 is a plan view (part 1) in which the vicinity of the sensor area is enlarged; FIG. 2 is an enlarged plan view (part 2) of the vicinity of the sensor area; FIG. 3 is an enlarged plan view (No. 3) of the vicinity of the sensor area; FIG. 1 is a diagram (part 1) for explaining a process of fabricating an intermediate film; FIG. 2 is a diagram (part 2) for explaining the process of fabricating an intermediate film; FIG. 3 is a diagram (part 3) for explaining the process of fabricating an intermediate film; FIG. 4 is a diagram (part 4) for explaining the process of fabricating an intermediate film; It is a figure explaining the process of arrange|positioning and press-bonding an intermediate film between a 1st glass plate and a 2nd glass plate. It is a figure explaining a part of intermediate film production process concerning a comparative example. FIG. 4 is a plan view illustrating an intermediate film that constitutes the laminated glass according to Modification 1 of the first embodiment;

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. In addition, in each drawing, the area and shape may be partially exaggerated so that the contents of the present invention can be easily understood.

The term "vehicle" is typically an automobile, but also refers to any moving object on which the laminated glass can be mounted, including trains, ships, aircraft, and the like.

Although a vehicle windshield will be described below as an example, it 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. is.

Further, in the following description, the term “planar view” refers to viewing an object from the normal direction passing through the center of gravity of the main surface of the vehicle-exterior glass plate. Further, the planar shape refers to the shape of an object viewed from the normal direction passing through the center of gravity of the main surface of the glass plate on the vehicle exterior side.

<First Embodiment>
FIG. 1 is a diagram illustrating the laminated glass according to the first embodiment, and FIG. 1A is a plan view schematically showing how the first glass plate 11 side is arranged toward the front side of the paper. 1(b) is a cross-sectional view along line AA in FIG. 1(a).

Referring to FIG. 1 , the laminated glass 10 is a laminated glass for vehicles having a first glass plate 11 , a second glass plate 12 , an intermediate film 13 and a shielding layer 14 . The laminated glass 10 is used, for example, as a windshield for a vehicle.

The first glass plate 11 and the second glass plate 12 are bonded with an intermediate film 13 interposed therebetween. The first glass plate 11 is arranged on the first side, which is the inner side of the vehicle when the laminated glass 10 is attached to the vehicle, and the second glass plate 12 is the outer side of the vehicle when the laminated glass 10 is attached to the vehicle. is placed on the second side where

In FIG. 1, for convenience of explanation, the actual curved shape of the laminated glass 10 is omitted and the outer shape is simplified. However, the laminated glass 10 may have a curved shape as well as the planar shape (non-curved shape) shown in FIG. The laminated glass 10 may have, for example, a single-curved shape curved in one of the vertical and horizontal directions when attached to a vehicle, or may have a double-curved shape curved in both the vertical and horizontal directions when attached to a vehicle. . However, the single-curved shape and the compound-curved shape are not limited to shapes curved vertically and/or horizontally when attached to a vehicle. Single-curved shapes include shapes that are curved in only one arbitrary direction. Also, a compound curved shape includes a shape curved in two or more arbitrary different directions.

When the laminated glass 10 has a curved shape, it is preferable that the laminated glass 10 is curved so as to be convex toward the outside of the vehicle. That is, the first glass plate 11 is preferably curved so as to be convex toward the intermediate film 13 side, and the second glass plate 12 is curved so as to be convex toward the side opposite to the intermediate film 13. preferably. In FIG. 1A, the laminated glass 10 has a trapezoidal shape, but the planar shape of the laminated glass 10 is not limited to a trapezoidal shape, and may be any shape including a rectangular shape.

When the laminated glass 10 has a curved shape, the minimum value of the curvature radius of the laminated glass 10 is preferably 500 mm or more and 100000 mm or less. The radii of curvature of the first glass plate 11 and the second glass plate 12 may be the same or different. When the radius of curvature of the first glass plate 11 and the radius of curvature of the second glass plate 12 are different, the radius of curvature of the first glass plate 11 is smaller than the radius of curvature of the second glass plate 12 .

The first glass plate 11 and the second glass plate 12 are a pair of glass plates facing each other, and the intermediate film 13 is positioned between the pair of glass plates. The first glass plate 11 and the second glass plate 12 are fixed with an intermediate film 13 sandwiched therebetween. The intermediate film 13 is a film that bonds the first glass plate 11 and the second glass plate 12 together. The intermediate film 13 may be composed of multiple layers.

The outer peripheral side surface of the intermediate film 13 is preferably edge-treated. That is, it is preferable that the outer peripheral side surface of the intermediate film 13 is treated so as not to protrude greatly from the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 . If the amount of protrusion of the outer peripheral side surface of the intermediate film 13 from the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 is 1 mm or less, the external appearance is not impaired. The amount of protrusion of the outer peripheral side surface of the intermediate film 13 from the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 is more preferably 0.5 mm or less, and further preferably 0.15 mm or less. When the laminated glass 10 is a side glass, the lower edge of the intermediate film 13 is not essential because the lower edge is hidden by the door panel.

Further, the outer peripheral side surface of the intermediate film 13 may be buried inside the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 . It is preferable that the amount of embedment of the outer peripheral side surface of the intermediate film 13 with respect to the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 is within 3 mm, since the strength of the laminated glass is not impaired. The embedding amount of the outer peripheral side surface of the intermediate film 13 with respect to the outer peripheral side surfaces of the first glass plate 11 and the second glass plate 12 is more preferably 2 mm or less, further preferably 1 mm or less.

The shielding layer 14 is an opaque layer, and is provided, for example, in a belt shape along the peripheral edge of the laminated glass 10 . The shielding layer 14 is, for example, an opaque colored ceramic layer and may be of any color, preferably a dark color such as black, brown, gray or dark blue, more preferably black. The shielding layer 14 may be a colored intermediate film or colored film having a light shielding property, a combination of a colored intermediate film and a colored ceramic layer, or a layer having a light control function. The colored film may be integrated with an infrared reflective film or the like.

The width of the shielding layer 14 in plan view is, for example, about 10 mm to 250 mm, preferably 20 mm to 220 mm, more preferably 30 mm to 200 mm. The presence of the opaque shielding layer 14 on the laminated glass 10 can suppress deterioration of the adhesive made of resin such as urethane that holds the peripheral portion of the laminated glass 10 to the vehicle body due to ultraviolet rays.

The shielding layer 14 can be formed, for example, by applying a ceramic color paste containing fusible glass frit containing a black pigment onto a glass plate by screen printing or the like and baking the paste, but is not limited thereto. The shielding layer 14 may be formed by, for example, applying an organic ink containing a black or dark pigment onto a glass plate by screen printing or the like, and drying the ink.

The shielding layer 14 is provided, for example, on the main surface of the first glass plate 11 on the interior side of the vehicle. However, the shielding layer 14 may be provided on the vehicle-interior main surface of the second glass plate 12, or may be provided on the vehicle-interior main surface of the first glass plate 11 and the vehicle-interior main surface of the second glass plate 12. Both may be provided.

The laminated glass 10 has a sensor region S defined by a region surrounded by the shielding layer 14 in plan view. When the shielding layers 14 are provided on both the main surface of the first glass plate 11 on the vehicle interior side and the main surface of the second glass plate 12 on the vehicle interior side, the sensor area S is defined by both the shielding layers 14 . be. That is, in this case, in plan view, the see-through area surrounded by the shielding layer 14 on the main surface of the first glass plate 11 on the vehicle interior side and the shielding layer 14 on the main surface on the vehicle interior side of the second glass plate 12 is the sensor area. Become S.

The laminated glass 10 includes, in plan view, a first side 10a closest to the sensor area S, a second side 10b facing the first side 10a across the sensor area S, and the first side 10a and the second side 10b. It has a third side 10c connecting one ends thereof, and a fourth side 10d connecting the other ends of the first side 10a and the second side 10b. When the laminated glass 10 is mounted on a vehicle, the first side 10a is the upper side, the second side 10b is the lower side, and the third side 10c and the fourth side 10d are side sides.

In addition, unless otherwise explained, the top refers to the roof side when viewed with the laminated glass 10 attached to the vehicle, and the bottom refers to the roof side when viewed with the laminated glass 10 attached to the vehicle. shall refer to the engine room side of the The upper side refers to the upper side of the sides of the laminated glass 10 . In addition, the lower side refers to the lower side of the sides of the laminated glass 10 . Further, the side edge refers to a side sandwiched between the upper side and the lower side among the sides of the laminated glass 10 . When the laminated glass 10 has a trapezoidal or rectangular shape, the lateral sides can be said to be two sides extending in the vertical direction of the laminated glass 10 .

The sensor area S is an area surrounded by the inner edge of the shielding layer 14 in plan view, but is a small area different from the opening area formed by surrounding the entire outer circumference of the laminated glass 10 . Note that the sensor area S may not be partially surrounded by the inner edge, such as when the shielding layer 14 is formed in a substantially U shape. In this case, the sensor region S is defined by regarding a straight line formed by virtually connecting the end of the inner edge of the shielding layer 14 and the other end as part of the inner edge of the shielding layer 14 .

The sensor area S is an information transmission/reception area in which information devices (sensors) such as cameras, LiDAR (Light Detection And Ranging), rain sensors, anti-collision sensors, white line detectors, and night vision devices transmit and/or receive information. . That is, when the laminated glass 10 is mounted on a vehicle, these information devices can be arranged inside the sensor area S of the vehicle. The band of light used by these information devices is, for example, about 750 nm or more and 1650 nm or less. In particular, LiDAR uses infrared light (eg wavelengths of 905 nm and 1550 nm).

In the laminated glass 10, the area where the shielding layer 14 is not formed is the see-through area. The inside of the sensor area S is also part of the see-through area. Here, the see-through region refers to a region having a visible light transmittance Tv of 70% or more.

When the laminated glass 10 is attached to the vehicle, the sensor area S does not hinder the driver's field of vision and is advantageous for obtaining information. It is preferable that it is arranged above the test area A defined in "Test area for light resistance".

The sensor area S may be coated with a low-reflection coating, an electric heating coating, an anti-fogging coating, or the like. Further, a plate-like member or film on which a low-reflection coating, an electric heating coating, an anti-fogging coating, or the like is applied may be applied to the sensor region S.

FIG. 2 is a plan view illustrating an intermediate film forming the laminated glass according to the first embodiment; Referring to FIG. 2 , the intermediate film 13 has a first region 131 and a second region 132 . In plan view, the second region 132 is surrounded by, for example, the first region 131 . Although the shape of the second region 132 is not limited, it is trapezoidal in plan view, for example.

The second region 132 is a region having a higher transmittance than the first region 131 for a specific wavelength. The second region 132 has, for example, higher infrared transmittance than the first region. In this case, the first area 131 is, for example, an infrared shielding area, and is formed of an organic resin film in which infrared shielding fine particles are dispersed. The second region 132 is, for example, a high infrared transmission region and is formed of an organic resin film containing no or almost no infrared shielding fine particles. Note that the first region 131 has a higher heat shielding property than the second region 132 .

In the first embodiment, a case where the first region 131 is an infrared shielding region and the second region 132 is a high infrared transmission region will be described below as an example.

From the viewpoint of heat shielding, the minimum value of the total solar transmittance Tts of the first region 131, which is an infrared shielding region, is preferably 75% or less, more preferably 70% or less, and even more preferably 65% or less. Note that the total solar transmittance of the first region 131 is not constant, and for example, the total solar transmittance of the lower end of the laminated glass 10 may be the minimum value and substantially the highest heat shielding property. The total solar transmittance Tts can be measured according to the measurement method specified in ISO13837.

The second region 132, which is a high infrared transmission region, satisfies at least one of _T905 ≧90% and _T1550 ≧80%. Here, T ₉₀₅ is the infrared transmittance of light with a wavelength of 905 nm, and T ₁₅₅₀ is the infrared transmittance of light with a wavelength of 1550 nm. T ₉₀₅ and T ₁₅₅₀ can be measured according to the measurement method specified in JIS R3106 (1998).

The particle diameter of the infrared shielding fine particles mixed in the organic resin film forming the first region 131 is preferably 0.2 μm or less, more preferably 0.001 μm or more and 0.15 μm or less. Materials for the infrared shielding fine particles include metals such as Sn, Ti, Si, Zn, Zr, Fe, Al, Cr, Co, Ce, In, Ni, Ag, Cu, Pt, Mn, Ta, W, V, and Mo. , oxides, nitrides, sulfides, or fine particles obtained by doping these with Sb or F. These microparticles can be used alone or as composites. In particular, the use of a mixture obtained by mixing these singly or in combination with an organic resin, or a coating obtained by coating these singly or in combination with an organic resin is useful for obtaining various performances required for automotive window glass. effective for

As the infrared shielding fine particles, it is preferable to use at least one of antimony-doped tin oxide (ATO) fine particles and tin-doped indium oxide (ITO) fine particles. Both the ATO fine particles and the ITO fine particles are excellent in infrared shielding performance and can be added in a small amount to the intermediate film. When ATO fine particles and ITO fine particles are compared, it is particularly preferable to use ITO fine particles as the infrared shielding fine particles because ITO fine particles are superior in infrared shielding performance.

Further, the organic resin film forming the first region 131 has a dispersion mixing ratio of 0.1 part by mass to 0.5 part by mass with respect to the total mass of 100 parts by mass of the organic resin film forming the first region 131. It is preferable to disperse and blend infrared shielding fine particles. Desired infrared shielding performance can be obtained by making it 0.1 parts by mass or more, and haze of the laminated glass 10 can be suppressed by making it 0.5 parts by mass or less, and the appearance of the laminated glass 10 can be improved. can be done.

FIG. 3 is a plan view (part 1) in which the vicinity of the sensor area is enlarged. The sensor area S is used, for example, as an information transmission/reception area in which an information device that handles infrared light such as LiDAR transmits and/or receives information. Therefore, the second area 132 is always positioned within the sensor area S in plan view. That is, part of the second region 132 is located within the sensor region S in plan view, and the outer edge of the second region 132 overlaps the shielding layer 14 in plan view.

The longest line segment L among the line segments connecting any two vertices of the sensor region S is preferably 100 mm or longer, more preferably 150 mm or longer, even more preferably 200 mm or longer, even more preferably 250 mm or longer, and particularly preferably 300 mm or longer. . Any two vertices may be adjacent vertices. In this case, the length of the line segment L matches the length of the longest side of the sensor area S. FIG. The area of the sensor region S is preferably 5000 mm ² or more, more preferably 10000 mm ² or more, still more preferably 20000 mm ² or more, and particularly preferably 30000 mm ² or more. The longer the line segment L and the larger the area of the sensor region S, the laminated glass 10 can be used for information devices with a wide angle of view that can recognize the state of the outside world in a wider range.

A distance D between the outer edge of the second area 132 and the outer edge of the sensor area S is preferably 2 mm or more, more preferably 3 mm or more, and even more preferably 4 mm or more. In the vicinity of the outer edge of the second region 132, the thickness tends to change, and perspective distortion due to the change in thickness tends to occur. Perspective distortion adversely affects information transmission and reception of information devices. That is, when perspective distortion occurs near the outer edge of the second region 132, the image will be distorted if the information device is a camera, or the optical axis will be shifted if the information device is a laser radar or millimeter wave radar. When the distance D between the outer edge of the second area 132 and the outer edge of the sensor area S is 2 mm or more, the portion where the thickness is likely to change is hidden by the shielding layer 14 , so perspective distortion in the sensor area S is less likely to occur.

FIG. 4 is a plan view (Part 2) in which the vicinity of the sensor area is enlarged. As shown in FIG. 4, in the sensor region S, each angle formed by a boundary Sb facing the second side 10b of the laminated glass 10 and boundaries Sc and Sd facing the third side 10c and the fourth side 10d The portion preferably has an R shape. Each corner formed by the boundary Sb and the boundaries Sc and Sd has preferably R=5 mm or more, more preferably R=7 mm or more, and even more preferably R=10 mm or more. By setting the R of the lower end portions of the sensor region S to 5 mm or more, the perspective distortion can be made less noticeable. When the corner of the sensor region S is R-shaped, the length of the line segment L is defined with the intersection point I of the extended lines of the sides forming the corner as the position of the vertex.

FIG. 5 is a plan view (No. 3) in which the vicinity of the sensor area is enlarged. As shown in FIG. 5, consider a straight line Lg passing through the center of gravity G of the sensor area S and an arbitrary point P on the boundary of the sensor area S in plan view. Then, on the straight line Lg, the thickness of the intermediate film 13 at a point Px 25 mm away from the point P in the outer direction of the boundary of the sensor region S is X [μm], and 25 mm in the inner direction of the boundary of the sensor region S from the point P. Let Y [μm] be the thickness of the intermediate film 13 at the remote point Py, and let Z [μm] be the thickness of the thinnest portion of the intermediate film 13 on the straight line Lg between the points Px and Py. At this time, it is preferable to satisfy (X+Y)/2−Z≦10 [μm].

If the thickness variation of the intermediate film 13 is within this range, the region where perspective distortion is likely to occur becomes narrower, so that the shielding layer for hiding the region where perspective distortion is likely to occur can be prevented from becoming too large. As a result, a large field of view for the driver can be secured. In recent years, the FOV (Field Of View) of information devices such as cameras has become larger, and there is a tendency to make it difficult to secure the driver's field of view. Not having them is effective as a method of securing a large field of view for the driver. It is more preferable to satisfy (X+Y)/2−Z≦5 [μm], and it is even more preferable to satisfy (X+Y)/2−Z≦3 [μm]. This makes it possible to further reduce the size of the shielding layer for hiding the area where perspective distortion is likely to occur.

Also, by reducing the size of the shielding layer for hiding the area where perspective distortion is likely to occur, it is possible to secure an area where another information device can be placed close. The FOV of the information device becomes large, and it becomes easy to arrange a plurality of information devices in a limited area on the upper side of the laminated glass 10 .

Further, even when the lateral FOV of the information device increases and the acute angle at both ends of the side facing the second side 10b of the laminated glass 10 in the sensor area S decreases, distortion near the acute angle can be suppressed.

In the sensor region S, the value of (X+Y)/2−Z at an arbitrary point P on the boundary facing the second side 10b of the laminated glass 10 [μm] is the third side 10c of the laminated glass 10 and the It is preferably smaller than the value [μm] of (X+Y)/2−Z at an arbitrary point P on the boundary facing the four sides 10d. In the sensor region S, near the boundary facing the second side 10b of the laminated glass 10, the perspective distortion is more noticeable than near the boundary facing the third side 10c and the fourth side 10d of the laminated glass 10, and the information of the information device. By doing so, perspective distortion in the entire sensor area S can be suppressed, and the influence on the transmission and reception of information of the information device can be suppressed.

[Method for producing laminated glass]
A method for manufacturing laminated glass 10 includes a step of producing intermediate film 13 and a step of disposing intermediate film 13 between first glass plate 11 and second glass plate 12 and press-bonding them. A specific description will be given below with reference to FIGS. 6 to 10 in order.

6 to 9 are diagrams for explaining the steps of fabricating the intermediate film. 10A and 10B are diagrams illustrating a process of disposing an intermediate film between the first glass plate and the second glass plate and pressing them. First, as shown in FIG. 6A, a first resin film 13A is prepared. The first resin film 13A is a resin film that forms the first region 131, which is an infrared shielding region, in the intermediate film 13. As shown in FIG. To prepare the first resin film 13A, for example, first, a plasticizer in which infrared shielding fine particles are dispersed is dispersedly added to a resin solution for the resin layer, and mixed and kneaded to prepare a resin raw material for the resin layer. do. Then, the resin raw material for the resin layer is molded by extrusion molding or the like. The first resin film 13A is obtained by, for example, stretching as necessary in order to give curvature to the upper and lower sides according to the design of the laminated glass. The first resin film 13A may be prepared by purchasing a commercially available product or the like.

Next, as shown in FIG. 6B, openings 13X are formed at predetermined positions in the first resin film 13A. In order to form the opening 13X, for example, a male mold having a cutter blade fitted to the shape of the opening 13X and a female mold having a recess provided in the base so that the cutter blade fits therein are used. The first resin film 13A is placed between them. Then, the male mold is pushed into the female mold, and a part of the first resin film 13A is cut out to form the opening 13X.

Next, as shown in FIGS. 7A and 7B, the second resin film 13B is cut into a shape having a larger area than the opening 13X to form a third resin film 13C. The third resin film 13C is a resin film that forms the second region 132, which is a high infrared transmission region, in the intermediate film 13. As shown in FIG. Only one third resin film 13C may be prepared, or a plurality of the third resin films may be prepared collectively. In order to collectively prepare a plurality of third resin films 13C, for example, as shown in FIG. and mixed and kneaded to prepare a resin raw material for the resin layer. Then, the resin raw material for the resin layer is molded by extrusion molding or the like to form the second resin film 13B. After that, the second resin film 13B is cut at the positions indicated by broken lines in FIG. 7A to obtain a plurality of third resin films 13C as shown in FIG. 7B. The cutting of the second resin film 13B is performed, for example, in the same manner as in the step of FIG. This can be done using a female mold with a recess provided in the base. The second resin film 13B and the third resin film 13C may be prepared by purchasing commercially available products.

In the process of FIG. 7(b), as shown in FIG. 8, each third resin film 13C is cut in a shape similar to the opening 13X in plan view and larger than the area of the opening 13X by ΔL. . Here, ΔL is preferably in the range of 0.001L or more and 0.005L or less with respect to the line segment L shown in FIG. When the third resin film 13C is cut into such an area, the residual stress of the third resin film 13C is released after cutting, and the third resin film 13C becomes smaller and has almost the same area as the opening 13X.

Also, the third resin film 13C is formed, for example, in a trapezoidal shape in plan view. In this case, in the third resin film 13C, the angle θ between the bottom of the trapezoid and the leg is preferably 70 degrees or less, more preferably 50 degrees or less, and even more preferably 30 degrees or less. As the angle θ is smaller, the laminated glass 10 can expand the lower side of the sensor area S in the horizontal direction, so that it can be applied to an information device with a wide angle of view that can recognize the state of the outside world in a wider range.

Next, as shown above the thick arrow in FIG. 9A, a third resin film 13C having a higher infrared transmittance than the first resin film 13A is fitted into the opening 13X. At this point, the area of the third resin film 13C is reduced to approximately the same area as that of the opening 13X, so that it is fitted into the opening 13X with almost no gap. If necessary, the boundary between the first resin film 13A and the third resin film 13C may be heated with a soldering iron or the like to weld them together. As a result, as shown below the thick arrow in FIG. 9A, a first region 131 formed from the first resin film 13A and a second region 132 formed from the third resin film 13C are provided. An intermediate film 13 is produced.

Next, the laminated glass 10 is manufactured in the process shown in FIG. First, the first glass plate 11 and the second glass plate 12 are prepared. The first glass plate 11 and the second glass plate 12 are bent into a desired shape predetermined by, for example, a design drawing or CAD data. For the bending of the first glass plate 11 and the second glass plate 12, for example, the glass plates are placed on a ring mold and passed through a heating furnace, and the glass plates are heated to a softening point or higher to be softened by gravity. Gravity forming can be used to bend to the desired shape. Alternatively, a press molding method may be used in which a glass plate heated to a softening point or higher is sandwiched between a male mold and a female mold and pressurized for molding. The first glass plate 11 and the second glass plate 12 may be bent separately, or the first glass plate 11 and the second glass plate 12 may be overlapped and bent at the same time.

A shielding layer 14 may be formed along the periphery of the first glass plate 11 and/or the second glass plate 12 . In this embodiment, the case where the shielding layer 14 is formed on the first glass plate 11 is illustrated. The shielding layer 14 can be formed, for example, by applying a ceramic color paste containing fusible glass frit containing a black pigment onto a glass plate by screen printing or the like and baking the paste, but is not limited thereto. The shielding layer 14 may be formed by, for example, applying an organic ink containing a black or dark pigment onto a glass plate by screen printing or the like, and drying the ink. The shielding layer 14 is preferably formed so that the area of the sensor region S defined by the area surrounded by the shielding layer 14 in plan view is 5000 mm ² or more after the compression bonding step. The shielding layer 14 is formed such that the outer edge of the third resin film 13C overlaps with the shielding layer 14 in plan view, and the distance from the outer edge of the third resin film 13C to the sensor area S is 2 mm or more. preferably.

Next, a preliminary pressure-bonding step is performed. In the preliminary press-bonding step, the intermediate film 13 obtained in the step of FIG. 9 is placed between the first glass plate 11 and the second glass plate 12 to form a laminated body 120, and the laminated body 120 is pressure-bonded. For example, this laminate 120 is placed in a rubber bag, a rubber channel, a resin bag, or the like, and in a vacuum controlled at a gauge pressure of -100 kPa or more and -65 kPa or less, at a temperature of about 70 ° C. or more and 120 ° C. or less. Crimping under control. Alternatively, laminate 120 may be passed between nipper rolls to apply a corresponding pressure to laminate 120 . Heating conditions, temperature conditions, and lamination methods are appropriately selected.

After the preliminary press-bonding process, the main press-bonding process is performed. In the main pressure-bonding step, for example, a pressure-bonding process is performed by heating and pressurizing under conditions controlled within the absolute pressure range of 0.6 MPa or more and 1.3 MPa or less and the temperature range of 100° C. or more and 150° C. or less. Thereby, the laminated glass 10 having excellent durability is obtained. In some cases, the main pressure-bonding step may not be performed in consideration of the simplification of the process and the characteristics of the material to be enclosed in the laminated glass 10 . That is, the main crimping step is performed as necessary. Through the above steps, the laminated glass 10 is obtained in which a portion of the third resin film 13C is positioned within the sensor region S defined by the region surrounded by the shielding layer 14 in plan view.

If the third resin film 13C is cut to have the same area as the opening 13X in the process of FIG. 7B, the residual stress in the third resin film 13C is released after the cutting and becomes smaller than the opening 13X. . As a result, as shown above the thick arrow in FIG. 11A, the third resin film 13C is fitted into the opening 13X of the first resin film 13A, resulting in a state shown below the thick arrow in FIG. Thus, a gap is created between the first region 131 and the second region 132 .

If the area of the sensor region is relatively small as in the conventional art, the area of the third resin film 13C is also small, so the degree of shrinkage due to the release of the residual stress is also small. Therefore, the gap is also small, and there have been cases where the gap is not a problem. However, as the level of autonomous driving increases, the detection angle of the sensor tends to widen, so it is becoming necessary to secure a larger sensor area. In this case, since the area of the third resin film 13C is increased, the degree of shrinkage due to the release of the residual stress is also increased. Therefore, the gap becomes large, and the gap becomes a problem.

Specifically, when the gap is large, bubbles may remain in the pre-compression bonding step when manufacturing the laminated glass 10 using the intermediate film 13 in the step of FIG. 10 . In addition, in the completed laminated glass 10, the thickness variation at the boundary between the first region 131 and the second region 132 of the intermediate film 13 increases, resulting in increased perspective distortion.

In the method of manufacturing laminated glass shown in FIGS. 6 to 10, in the steps shown in FIGS. 7A and 7B, the second resin film 13B is cut into a shape having a larger area than the opening 13X, A third resin film 13C is formed. Therefore, it is difficult for a gap to occur at the boundary between the first region 131 and the second region 132 of the intermediate film 13, and the generation of residual bubbles in the preliminary pressure-bonding process can be suppressed. In addition, since the thickness variation at the boundary between the first region 131 and the second region 132 of the intermediate film 13 is small, the occurrence of perspective distortion can be suppressed.

Here, the first glass plate 11, the second glass plate 12, and the intermediate film 13 will be described in detail.

[Glass plate]
The first glass plate 11 and the second glass plate 12 may be inorganic glass or organic glass. As the inorganic glass, for example, soda lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, quartz glass, etc. are used without particular limitation. The second glass plate 12 located outside the laminated glass 10 is preferably inorganic glass from the viewpoint of scratch resistance, and preferably soda-lime glass from the viewpoint of moldability. When the first glass plate 11 and the second glass plate 12 are soda-lime glass, clear glass, green glass containing a predetermined amount or more of an iron component, and UV-cut green glass can be suitably used.

The inorganic glass may be either untempered glass or tempered glass. Untempered glass is obtained by shaping molten glass into a plate and slowly cooling it. Tempered glass is obtained by forming a compressive stress layer on the surface of untempered glass.

The tempered glass may be either physically tempered glass such as air-cooled tempered glass or chemically tempered glass. In the case of physically strengthened glass, for example, the temperature difference between the glass surface and the inside of the glass is compressed to the glass surface by an operation other than slow cooling, such as quenching the glass sheet heated uniformly in bending from a temperature near the softening point. By creating a stress layer, the glass surface can be strengthened.

In the case of chemically strengthened glass, for example, after bending, the glass surface can be strengthened by generating compressive stress on the glass surface by an ion exchange method or the like. Moreover, glass that absorbs ultraviolet rays or infrared rays may be used, and although transparency is preferable, a glass plate that is colored to such an extent that transparency is not impaired may be used. When the laminated glass 10 is a windshield, both the first glass plate 11 and the second glass plate 12 are preferably untempered glass.

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

As the first glass plate 11 and the second glass plate 12, it is particularly preferable to select glass having good values of _T905 and _T1550 . Specifically, at least one of the first glass plate 11 and the second glass plate 12 has a weight ratio of total iron content converted to Fe ₂ O ₃ : 0.002% or more and 1% or less, Cr ₂ O ₃ : 0.0001% or more and 1% or less and Co: 0.0001% or more and 0.5% or less are preferably included.

In addition, at least one of the first glass plate 11 and the second glass plate 12 has a total iron content converted to Fe ₂ O ₃ in terms of weight ratio: 0.002% or more and 0.06% or less, Cr ₂ O ₃ : 0.0001% or more and 0.06% or less may be included. In addition, at least one of the first glass plate 11 and the second glass plate 12 has a total iron content converted to Fe ₂ O ₃ in terms of weight ratio: 0.002% or more and 0.06% or less, Cr ₂ O ₃ : 0.0015% or more and 1% or less, Co: 0.0001% or more and 0.5% or less may be included. In addition, at least one of the first glass plate 11 and the second glass plate 12 has a weight ratio of total iron content converted to Fe ₂ O ₃ : 0.02% or more and 1% or less, Cr ₂ O ₃ : 0.002% or more and 0.5% or less, Co: 0.0001% or more and 0.5% or less. In addition, at least one of the first glass plate 11 and the second glass plate 12 has a weight ratio of total iron content converted to Fe ₂ O ₃ : 0.002% or more and 1% or less, Cr ₂ O ₃ : 0.001% to 0.5%, Co: 0.0001% to 0.5%, Se: 0.0003% to 0.5%.

The first glass plate 11 and the second glass plate 12 are not limited to a trapezoidal shape or a rectangular shape, and may have various shapes and curvatures. For the bending of the first glass plate 11 and the second glass plate 12, a gravity forming method, a press forming method, a roller forming method, or the like may be used. The forming method of the first glass plate 11 and the second glass plate 12 is not particularly limited either. For example, in the case of inorganic glass, glass plates formed by a float method or the like are preferable.

The plate thickness of the second glass plate 12 is preferably 1.1 mm or more and 3 mm or less at the thinnest part. When the plate thickness of the second glass plate 12 is 1.1 mm or more, strength such as resistance to stepping stones is sufficient. is preferred. The plate thickness of the second glass plate 12 is more preferably 1.8 mm or more and 2.8 mm or less at the thinnest part, more preferably 1.8 mm or more and 2.6 mm or less, and even more preferably 1.8 mm or more and 2.2 mm or less. 1.8 mm or more and 2.1 mm or less is more preferable.

The plate thickness of the first glass plate 11 is preferably 0.3 mm or more and 2.3 mm or less. When the plate thickness of the first glass plate 11 is 0.3 mm or more, the handleability is good, and when it is 2.3 mm or less, the mass does not become too large.

Further, when the thickness of the first glass plate 11 is not appropriate, if two glasses having particularly deep curves are formed as the first glass plate 11 and the second glass plate 12, a mismatch occurs in the shapes of the two plates, resulting in a mismatch after crimping. It greatly affects glass quality such as residual stress.

However, by setting the plate thickness of the first glass plate 11 to 0.3 mm or more and 2.3 mm or less, it is possible to maintain glass quality such as residual stress. Setting the plate thickness of the first glass plate 11 to 0.3 mm or more and 2.3 mm or less is particularly effective in maintaining the quality of the glass with deep bends. The plate thickness of the first glass plate 11 is more preferably 0.5 mm or more and 2.2 mm or less, and further preferably 0.7 mm or more and 2.1 mm or less. Within this range, the above effects are more pronounced.

When the laminated glass 10 is used for a head-up display, for example, the thickness of the first glass plate 11 and/or the second glass plate 12 may not be constant, but may vary depending on the location. For example, when the laminated glass 10 is a windshield, one or both of the first glass plate 11 and the second glass plate 12 are plate-shaped from the lower side to the upper side of the windshield when the windshield is attached to the vehicle. It may also have a wedge-shaped cross-section with a gradually increasing thickness. In this case, if the film thickness of the intermediate film 13 is constant, the total wedge angle of the first glass plate 11 and the second glass plate 12 may be varied within a range of, for example, greater than 0 mrad and less than or equal to 1.0 mrad. . By forming one or both of the first glass plate 11 and the second glass plate 12 to have a wedge-shaped cross section, the intermediate film 13 can have a constant film thickness without wedges. Therefore, as in the case where the intermediate film 13 has a wedge-shaped cross section, it is necessary to match the wedge-shaped thicknesses of the first resin film in which the opening is formed and the third resin film to be fitted in the opening. do not have.

Coatings having functions of water repellency, blocking ultraviolet rays and infrared rays, and coatings having low reflection characteristics and low radiation characteristics may be provided on the outside of the first glass plate 11 and/or the second glass plate 12 . Also, the side of the first glass plate 11 and/or the second glass plate 12 in contact with the intermediate film 13 may be provided with a coating that cuts ultraviolet rays or infrared rays, has low radiation characteristics, absorbs visible light, is colored, or the like.

When the first glass plate 11 and the second glass plate 12 are made of curved inorganic glass, the first glass plate 11 and the second glass plate 12 are formed by bending after forming by the float method and before bonding with the intermediate film 13. be done. Bending is performed by softening the glass by heating. The heating temperature of the glass during bending is preferably controlled within a range of approximately 550°C to 700°C.

[Interlayer film]
Thermoplastic resins are often used as the intermediate film 13. For example, plasticized polyvinyl acetal-based resin, plasticized polyvinyl chloride-based resin, saturated polyester-based resin, plasticized saturated polyester-based resin, polyurethane-based resin, and plasticized polyurethane-based resin are used. Resins, ethylene-vinyl acetate copolymer resins, ethylene-ethyl acrylate copolymer resins, cycloolefin polymer resins, ionomer resins, and other thermoplastic resins that have been conventionally used for this type of application. 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. is 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.

However, when a specific substance is enclosed in the intermediate film 13, depending on the type of substance to be enclosed, it may be deteriorated by a specific plasticizer. Examples of plasticizer-free resins include ethylene-vinyl acetate copolymer (EVA) resins.

Examples of the polyvinyl acetal-based resin include a polyvinyl formal resin obtained by reacting polyvinyl alcohol (PVA) and formaldehyde, a narrowly defined polyvinyl acetal-based resin obtained by reacting PVA and acetaldehyde, and PVA and n-butyraldehyde. Examples include polyvinyl butyral (PVB) resins obtained by reacting, especially transparency, weather resistance, strength, adhesive strength, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation. PVB is preferred because of its excellent balance of properties. 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 13 is not limited to thermoplastic resin. Also, the intermediate film 13 may contain functional particles such as an infrared absorber, an ultraviolet absorber, and a light-emitting agent.

The film thickness of the intermediate film 13 is preferably 0.5 mm or more at the thinnest part. In addition, when the intermediate film 13 consists of multiple layers, the film thickness of the intermediate film 13 is the total film thickness of all the layers. When the thickness of the thinnest portion of the intermediate film 13 is 0.5 mm or more, the laminated glass has sufficient impact resistance. Further, the film thickness of the intermediate film 13 is preferably 3 mm or less at the thickest part. When the maximum thickness of the intermediate film 13 is 3 mm or less, the mass of the laminated glass does not become too large. The maximum thickness of the intermediate film 13 is more preferably 2.8 mm or less, and even more preferably 2.6 mm or less.

When the laminated glass 10 is used as a head-up display, for example, the thickness of the intermediate film 13 may not be constant, but may vary depending on the location. For example, when the laminated glass 10 is a windshield, the intermediate film 13 may have a wedge-shaped cross section in which the film thickness gradually increases from the lower side to the upper side of the windshield when the windshield is attached to the vehicle. In this case, if the plate thicknesses of the first glass plate 11 and the second glass plate 12 are constant, the wedge angle of the intermediate film 13 may be varied within a range of, for example, greater than 0 mrad and less than or equal to 1.0 mrad.

When the intermediate film 13 has a wedge-shaped cross section, both the first resin film 13A and the third resin film 13C preferably have a wedge-shaped cross section. As a result, when laminated glass is formed, the thickness variation at the boundary between the first region 131 and the second region 132 of the intermediate film 13 is reduced, so that perspective distortion can be suppressed.

The intermediate film 13 may have three or more layers. For example, if the interlayer film is formed of three or more layers, and the shear modulus of any layer other than the layers on both sides is made smaller than the shear modulus of the layers on both sides by adjusting the plasticizer, etc., the sound insulation of the laminated glass 10 can be improved. can be improved. In this case, the shear moduli of the layers on both sides may be the same or different.

Moreover, when the intermediate film 13 includes a plurality of layers, each layer included in the intermediate film 13 is desirably formed of the same material, but these layers may be formed of different materials. However, from the viewpoint of adhesiveness with the first glass plate 11 and the second glass plate 12 or functional materials to be put into the laminated glass 10, the above materials are used for 50% or more of the film thickness of the intermediate film 13. is desirable.

In order to produce the intermediate film 13, 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. Thereafter, the intermediate film 13 is completed by stretching the extruded resin film, for example, as necessary, in order to give curvature to the upper and lower sides in accordance with the design of the laminated glass. In the intermediate film 13, the method for producing the first resin film 13A that becomes the first region 131, which is the infrared shielding region, is as described above.

[Laminated glass]
The total thickness of the laminated glass 10 is preferably 2.8 mm or more and 10 mm or less. If the total thickness of the laminated glass 10 is 2.8 mm or more, sufficient rigidity can be secured. Further, if the total thickness of the laminated glass 10 is 10 mm or less, sufficient transmittance can be obtained and haze can be reduced.

On at least one side of the laminated glass 10, the displacement between the first glass plate 11 and the second glass plate 12 is preferably 1.5 mm or less, more preferably 1 mm or less. Here, the displacement between the first glass plate 11 and the second glass plate 12 is the amount of displacement between the outer peripheral side surface of the first glass plate 11 and the outer peripheral side surface of the second glass plate 12 in plan view.

In at least one side of the laminated glass 10, it is preferable that the displacement between the first glass plate 11 and the second glass plate 12 is 1.5 mm or less in terms of not spoiling the appearance. In at least one side of the laminated glass 10, it is more preferable that the displacement between the first glass plate 11 and the second glass plate 12 is 1.0 mm or less in terms of not spoiling the appearance.

In order to manufacture the laminated glass 10, the intermediate film 13 is sandwiched between the first glass plate 11 and the second glass plate 12 to form a laminate. Then, for example, this laminate is placed in a rubber bag, a rubber chamber, a resin bag, etc., and the temperature is controlled in the range of about 70 ° C. to 110 ° C. in a vacuum controlled in the range of gauge pressure -100 kPa to -65 kPa. and glue. Heating conditions, temperature conditions, and lamination methods are appropriately selected.

Further, the laminated glass 10 having more excellent durability can be obtained by performing a heat-pressing process under conditions controlled, for example, at a temperature of 100° C. to 150° C. and an absolute pressure of 0.6 MPa to 1.5 MPa. However, in some cases, this heating and pressurizing process may not be used in consideration of the simplification of the process and the properties of the material to be enclosed in the laminated glass 10 .

A method called “cold bend” may be used in which either one or both of the first glass plate 11 and the second glass plate 12 are joined while being elastically deformed. Cold bend is a laminate consisting of the first glass plate 11, the intermediate film 13, and the second glass plate 12 fixed by temporary fixing means such as tape, and a conventionally known nip roller, rubber bag, rubber chamber, or the like. It can be achieved by using a pre-crimping device and an autoclave.

Between the first glass plate 11 and the second glass plate 12, in addition to the intermediate film 13, a heating wire, infrared reflection, light emission, power generation, dimming, touch panel, and visible light reflection are provided within a range that does not impair the effects of the present application. , scattering, decorating, absorbing, and other functions. Also, the laminated glass 10 may have a film having functions such as anti-fogging, water repellency, heat shielding and low reflection on its surface. Also, the main surface of the first glass plate 11 on the outside of the vehicle and the main surface of the second glass plate 12 on the inside of the vehicle may have a film having functions such as heat shielding and heat generation.

<Modification 1 of the first embodiment>
Modification 1 of the first embodiment shows an example of an intermediate film different from that of the first embodiment. In addition, in Modification 1 of the first embodiment, the description of the same components as those of the already described embodiment may be omitted.

12 is a plan view illustrating an intermediate film forming a laminated glass according to Modification 1 of Embodiment 1. FIG. Referring to FIG. 12, the intermediate film 13M differs from the intermediate film 13 (see FIG. 2) in that the first region 131 includes a shade function region 135 and a non-shade function region 136. As shown in FIG.

The shade function area 135 is a belt-like area with a reduced visible light transmittance, which is called a shade band. A non-shade function region 136 adjacent to the shade function region 135 is a region having a higher visible light transmittance than the shade function region 135 . The visible light transmittance of the non-shade function area 136 is, for example, 70% or more.

It is preferable that the shade function area 135 is adjusted so that the transmittance gradually increases from the top to the bottom of FIG. 12 , because antiglare properties can be imparted without obstructing the driver's field of vision. Also, the boundary between the shade function area 135 and the non-shade function area 136 may be unclearly blurred.

In the example of FIG. 12, the entire second region 132 is provided in the shade function region 135 of the first region 131, but part of the second region 132 is provided in the shade function region 135 of the first region 131, The other portion may be provided in the non-shade functional region 136 of the first region 131 . The visible light transmittance of the resin film arranged in the second region 132 is higher than the visible light transmittance of the shade function region 135 of the first region 131 . The visible light transmittance of the second region 132 is preferably 70% or more.

Since the first region 131 has the shade function region 135, the intermediate film 13M can enhance the antiglare effect of the laminated glass when used for the laminated glass. That is, since the first region 131 of the intermediate film 13M has the shade function region 135, the visible light incident obliquely above the driver's field of vision can be attenuated before entering the vehicle. can prevent dazzling.

In addition, since the intermediate film 13M includes the second region 132 having a higher visible light transmittance than the shade function region 135 of the first region 131, by making the second region 132 correspond to the sensor region of the laminated glass, An information device can transmit and/or receive information via the sensor area.

The shade function area 135 is produced, for example, by coloring a part of the first resin film 13A shown in FIG. The coloring pigment used to color part of the first resin film 13A is a pigment that can be used for plastics, and the amount added is adjusted so that the visible light transmittance of the colored part is, for example, 40% or less. For example, azo-based, phthalocyanine-based, quinacridone-based, perylene-based, perinone-based, dioxazine-based, anthraquinone-based, isoindolino-based organic coloring pigments, oxides, hydroxides, sulfides, chromic acid, Inorganic coloring pigments such as sulfates, carbonates, silicates, phosphates, arsenates, ferrocyanides, carbon, and metal powders are included. These color pigments may be used alone, or two or more of them may be used in combination.

The process of forming the opening 13X in the first resin film 13A is the same as in the first embodiment, but at least part of the opening 13X is formed in the shade function region 135. As shown in FIG. Then, a third resin film 13C having a higher visible light transmittance than the shade function region 135 is fitted into the opening X. As shown in FIG. Similar to the first embodiment, by cutting the second resin film 13B into a shape having a larger area than the opening 13X and forming the third resin film 13C, the same effect as in the first embodiment can be obtained.

<Examples, Comparative Examples>
Examples and comparative examples will be described below, but the present invention is not limited to these examples. Examples 1 and 3 are working examples, examples 2 and 4 are comparative examples, and example 5 is a reference example.

(Example 1)
A first glass plate (manufactured by AGC), which will be the inner plate of laminated glass, and a second glass plate (manufactured by AGC), which will be the outer plate, were prepared. The dimensions of the first glass plate and the second glass plate were both 300 mm long×300 mm wide×2 mm thick. Then, a black colored ceramic layer was formed as a shielding layer on the outer peripheral portion of the inner side surface of the first glass plate. The colored ceramic layer was formed by screen-printing black ceramic paste on the surface of the first glass plate, drying at 120° C. for 15 minutes, and then firing at 600° C. for 5 minutes. At this time, a square opening of 100 mm long×100 mm wide and an area of 10000 mm ² was formed in the colored ceramic layer as a sensor area. At this time, L was 141 mm. A 0.76 mm thick PVB film containing infrared shielding fine particles was prepared as the first resin film, and a 0.76 mm thick PVB film containing no infrared shielding fine particles was prepared as the second resin film. .

Then, an opening having a length of 100 mm, a width of 100 mm, and an area of 10000 mm ² was formed in the first resin film by the method described with reference to FIG. Next, a third resin film was formed from the second resin film by the method described with reference to FIG. The third resin film was cut in a shape similar to that of the opening in a plan view, and cut by ΔL larger than the area of the opening. Here, ΔL is set to 0.001L for the longest line segment L among the line segments connecting any two vertices of the sensor area. Next, by the method described with reference to FIG. 9, the third resin film was fitted into the opening of the first resin film to produce an intermediate film. A gap could not be confirmed between the third resin film and the first resin film. Next, a laminated glass was produced by the method described with reference to FIG.

After manufacturing the laminated glass, the thickness of the intermediate film was measured in the vicinity of the sensor area, and the value of (X+Y)/2-Z for all boundaries of the sensor area was found to be 10 μm at maximum. Further, when the presence or absence of residual bubbles was visually checked after the laminated glass was produced, residual bubbles could not be confirmed.

(Example 2)
In Example 2, when forming the third resin film from the second resin film, the third resin film was cut to have the same area as the opening. That is, in Example 2, ΔL=0. When the third resin film was fitted into the opening of the first resin film to prepare an intermediate film, a slight gap of about 0.7 mm was confirmed between the third resin film and the first resin film. A laminated glass was produced in the same manner as in Example 1 except for this.

After manufacturing the laminated glass, the thickness of the intermediate film was measured in the vicinity of the sensor area, and the value of (X+Y)/2-Z for all boundaries of the sensor area was found to be 15 μm at maximum. Further, when the presence or absence of residual bubbles was visually confirmed after the laminated glass was produced, residual bubbles were confirmed.

(Example 3)
In Example 3, ΔL=0.005L. When the third resin film was fitted into the opening of the first resin film to prepare an intermediate film, no gap could be confirmed between the third resin film and the first resin film. A laminated glass was produced in the same manner as in Example 1 except for this.

After manufacturing the laminated glass, the thickness of the intermediate film was measured in the vicinity of the sensor area, and the value of (X+Y)/2-Z for all boundaries of the sensor area was found to be 8 μm at maximum. Further, when the presence or absence of residual bubbles was visually checked after the laminated glass was produced, residual bubbles could not be confirmed.

(Example 4)
In Example 4, ΔL=0.0005L. When the third resin film was fitted into the opening of the first resin film to prepare an intermediate film, a slight gap of about 0.6 mm was confirmed between the third resin film and the first resin film. A laminated glass was produced in the same manner as in Example 1 except for this.

After manufacturing the laminated glass, the thickness of the interlayer was measured in the vicinity of the sensor area, and the value of (X+Y)/2-Z for all boundaries of the sensor area was found to be 13 μm at maximum. Further, when the presence or absence of residual bubbles was visually confirmed after the laminated glass was produced, residual bubbles were confirmed.

(Example 5)
In Example 5, ΔL=0.006L. When trying to fit the third resin film into the opening of the first resin film, the third resin film is larger than the opening of the first resin film, and the third resin film is fitted into the opening of the first resin film. I couldn't. Therefore, as in Example 1, an intermediate film and a laminated glass could not be produced.

例１～例５の結果を表１にまとめた。なお、表１において、〇は泡残りなし、×は泡残り有を示している。

The results of Examples 1 to 5 are summarized in Table 1. In Table 1, ◯ indicates no residual foam, and × indicates residual foam.

In this way, in the step of producing the intermediate film, the second resin film is cut into a shape having a larger area than the opening to form the third resin film, and the third resin film is formed in the opening of the first resin film. By fitting, a state in which there was no gap or almost no gap between the third resin film and the first resin film was obtained. As a result, it was possible to suppress the generation of residual bubbles in the process of manufacturing the laminated glass. In addition, since there is almost no gap between the third resin film and the first resin film, variations in the thickness of the intermediate film in the vicinity of the boundary between the third resin film and the first resin film are suppressed. (X+Y)/2-Z≦10 [μm] was achieved. It is considered that this can suppress perspective distortion of the laminated glass.

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 and substitutions can be made to the above-described embodiments and the like without departing from the scope of the claims. can be added.

10 laminated glass 10a first side 10b second side 10c third side 10d fourth side 11 first glass plate 12 second glass plate 13, 13M intermediate film 13A first resin film 13B second resin film 13C third resin film 13X Opening 14 Shielding layer 120 Laminate 131 First region 132 Second region 135 Shade function region 136 Non-shade function region

Claims (15)

a step of making an intermediate film;
placing the intermediate film between the first glass plate and the second glass plate and crimping them;
The step of producing the intermediate film includes:
forming an opening in the first resin film;
a step of cutting the second resin film into a shape having a larger area than the opening to form a third resin film;
and a step of fitting the third resin film into the opening. The step of producing the intermediate film includes:
2. The method for manufacturing laminated glass according to claim 1, further comprising heating a boundary portion between said first resin film and said third resin film to weld them after said fitting step. The first glass plate and/or the second glass plate has a shielding layer formed along a peripheral edge,
After the step of crimping, a portion of the third resin film is positioned within a sensor region defined by the region surrounded by the shielding layer in plan view,
The method for manufacturing laminated glass according to claim 1 or 2, wherein the sensor area has an area of 5000 mm ² or more. 4. The method for manufacturing laminated glass according to claim 3, wherein after said crimping step, the longest line segment L among the line segments connecting any two vertices of said sensor region is 100 mm or more. In the step of forming the third resin film,
The third resin film is cut in a shape similar to the opening in plan view and larger than the area of the opening by ΔL,
5. The method for manufacturing laminated glass according to claim 4, wherein said ΔL is in the range of 0.001L or more and 0.005L or less. The outer edge of the third resin film overlaps the shielding layer in plan view,
4. The method for manufacturing laminated glass according to claim 3, wherein the distance from the outer edge of said third resin film to said sensor area is 2 mm or more. On a straight line Lg passing through the center of gravity G of the sensor area and an arbitrary point P on the boundary of the sensor area in plan view, the above-mentioned X [μm] is the thickness of the intermediate film, Y [μm] is the thickness of the intermediate film at a point Py that is 25 mm away from the point P toward the inside of the boundary of the sensor area, and the point Px and the point Py The laminated glass according to claim 3, which satisfies (X + Y)/2-Z ≤ 10 [μm], where Z [μm] is the thickness of the thinnest portion of the intermediate film on the straight line Lg between manufacturing method. The laminated glass has, in plan view, a first side closest to the sensor area, a second side facing the first side across the sensor area, and one end of the first side and the second side. having a third side connecting the two sides and a fourth side connecting the other ends of the first side and the second side;
In the sensor area, the value [μm] of (X+Y)/2−Z at an arbitrary point P on the boundary facing the second side is an arbitrary value [μm] on the boundary facing the third side and the fourth side 8. The method for producing a laminated glass according to claim 7, wherein the value [μm] of (X+Y)/2−Z at the point P of . The laminated glass has, in plan view, a first side closest to the sensor area, a second side facing the first side across the sensor area, and one end of the first side and the second side. having a third side connecting the two sides and a fourth side connecting the other ends of the first side and the second side;
3. In the sensor area, each corner formed by a boundary facing the second side and a boundary facing the third side and the fourth side has an R shape of R=5 mm or more. 3. The method for manufacturing the laminated glass according to 3. The method for manufacturing laminated glass according to claim 3, wherein the third resin film has a trapezoidal shape with an angle of 70 degrees or less between the bottom and the leg. The first resin film contains infrared shielding fine particles,
3. The method for manufacturing laminated glass according to claim 1, wherein said third resin film having a higher infrared transmittance than said first resin film is fitted into said opening. The first resin film has a shade function area,
at least part of the opening is formed in the shade function area;
3. The method of manufacturing laminated glass according to claim 1, wherein said third resin film having a higher visible light transmittance than said shade functional region is fitted into said opening. a first glass plate;
a second glass plate;
an intermediate film positioned between the first glass plate and the second glass plate;
a shielding layer formed along the peripheral edges of the first glass plate and/or the second glass plate;
The intermediate film includes a first region and a second region having a higher transmittance for a specific wavelength than the first region,
A portion of the second region is located within a sensor region defined by the region surrounded by the shielding layer in plan view,
On a straight line Lg passing through the center of gravity G of the sensor area and an arbitrary point P on the boundary of the sensor area in plan view, the above-mentioned X [μm] is the thickness of the intermediate film, Y [μm] is the thickness of the intermediate film at a point Py that is 25 mm away from the point P toward the inside of the boundary of the sensor area, and the point Px and the point Py Laminated glass satisfying (X+Y)/2−Z≦10 [μm], where Z [μm] is the thickness of the thinnest portion of the intermediate film on the straight line Lg between the two. The laminated glass has, in plan view, a first side closest to the sensor area, a second side facing the first side across the sensor area, and one end of the first side and the second side. having a third side connecting the two sides and a fourth side connecting the other ends of the first side and the second side;
In the sensor area, the value [μm] of (X+Y)/2−Z at an arbitrary point P on the boundary facing the second side is an arbitrary value [μm] on the boundary facing the third side and the fourth side 14. The laminated glass according to claim 13, which is smaller than the value [μm] of (X+Y)/2−Z at point P of . The laminated glass according to claim 13 or 14, wherein the sensor area has an area of 5000 mm ^{2 or} more.

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