Laminated glass for automobile window and automobile

Abstract

A laminated glass for an automobile window, which is provided with a first glass plate, an intermediate film, and a second glass plate in this order from the outside to the inside of the automobile, and which is characterized in that: a plurality of deformation parts are provided on the surface of the inside of the automobile of the first glass plate and / or the second glass plate so as to be spaced apart in the surface direction; the deformed portion includes a recessed portion and a crack formed around the recessed portion, and the value of the ratio of the depth of the recessed portion to the diameter of the recessed portion on the surface is 2 or less.

Description

Technical Field

[0001] The present invention relates to laminated glass for automobile windows and an automobile. Background Art

[0002] When a car collides with a pedestrian or other person, there is a demand for technology that reduces the impact on the person. For example, Patent Document 1 describes a technology that reduces the impact on the person by separating the rear end of the hood and the front end of the windshield, which are connected by a molding, when an impact occurs. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-213928 Summary of the Invention Technical problem to be solved by the invention

[0004] Laminated glass used in automotive windows, such as windshields, is required to break appropriately to reduce the impact on pedestrians and other people during collisions. For example, laminated glass used in automotive windows is required to meet the Head Injury Criterion (HIC) below the expected value. Furthermore, laminated glass used in automotive windows is also required to ensure that passengers can see outside the vehicle through the laminated glass.

[0005] The technical problem to be solved by one embodiment of the present invention is to reduce the impact on the person when a car collides with the person, and not hinder the passengers in the car from seeing the outside of the car. Means of solving technical problems

[0006] One embodiment of the present invention is a laminated glass for an automotive window, comprising, in order from the vehicle exterior to the vehicle interior, a first glass sheet, an interlayer film, and a second glass sheet, wherein a plurality of deformed portions are provided on the vehicle interior surface of the first glass sheet and / or the second glass sheet at intervals along the surface direction, the deformed portions including recessed portions and cracks formed around the recessed portions, and a ratio of the depth of the recessed portions to the diameter of the recessed portions on the surface is not more than 2. Effects of the Invention

[0007] According to one embodiment of the present invention, a technology can be provided that reduces the impact on a person when a car collides with the person, while not preventing passengers in the car from seeing outside the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a front view of an automobile equipped with the laminated glass according to one embodiment of the present invention. Figure 2 yes Figure 1The cross-sectional view of the laminated glass shown is for explaining breakage of the laminated glass when a car collides with a person. Figure 3 Observed from the inside of the car Figure 1 A top view of the laminated glass is shown. Figure 4 yes Figure 3 AA line section view. Figure 5 (a) is included Figure 3 An enlarged view of part B of a deformed portion in A, Figure 5 (b) Yes Figure 5 (a) CC line cross-sectional view. Figure 6 1 is a diagram illustrating the effect of a deformation portion of one embodiment of the present invention. Figure 6 (a) is a partial cross-sectional view of a laminated glass 1' in the prior art. Figure 6 (b) is a partial cross-sectional view of the laminated glass 1 according to one embodiment of the present invention. Figure 7 (a) to (c) are diagrams showing modified examples of the deformation portion. Figure 8 It is a schematic diagram of a processing device for processing a deformed portion. Figure 9 This is a captured image of one deformed portion formed in Example 1. Figure 10 This is a captured image of a deformed portion formed in Example 2. Figure 11 1 and 2 are diagrams showing a captured image of one deformed portion formed in Example 3 and the contour shape of the concave cross section. Figure 12 This is a captured image of a deformed portion formed in Example 4. Figure 13 This is a captured image of a deformed portion formed in Example 6. DETAILED DESCRIPTION

[0009] Hereinafter, the embodiment will be described with reference to the accompanying drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, and their description may be omitted.

[0010] Figure 1 An example is shown in which the laminated glass for an automobile window 1 manufactured according to one embodiment of the present invention is used as a window glass of an automobile 100. Figure 1 In the example shown, laminated glass for automobile windows (hereinafter also referred to as laminated glass) 1 is glass installed in an opening (window) on the front of a vehicle body 2 of an automobile 100, namely, the windshield. However, laminated glass 1 may also be window glass other than the windshield, such as side windows, rear windows, or sunroofs.

[0011] Figure 2 Show Figure 1 The partial cross-sectional view of the laminated glass 1 is shown. Figure 2 As shown, the laminated glass 1 includes, in order from the vehicle exterior to the vehicle interior, a first glass sheet 10, an interlayer film 30, and a second glass sheet 20. The first glass sheet 10 and the second glass sheet 20 are joined via the interlayer film 30. The first glass sheet 10 has a first surface F1 serving as the vehicle exterior surface and a second surface F2 serving as the vehicle interior surface, while the second glass sheet 20 has a third surface F3 serving as the vehicle exterior surface and a fourth surface F4 serving as the vehicle interior surface.

[0012] The material constituting the first glass sheet 10 and the second glass sheet 20 (hereinafter also referred to as the laminated glass sheet) in the laminated glass 1 is preferably inorganic glass. Examples of inorganic glass include soda-lime silicate glass, aluminosilicate glass, borate glass, lithium aluminosilicate glass, and borosilicate glass. While the method for forming the glass sheet composed of inorganic glass is not particularly limited, the glass sheet is preferably formed by, for example, the float process (float glass).

[0013] The glass sheets used to make the laminated glass 1 can be either untempered glass (formed by shaping molten glass into a sheet and then slowly cooling it), which has not been subjected to any tempering treatment, or tempered glass that has been subjected to any tempering treatment. Tempering treatments include air-cooling tempering, chemical tempering, and the like. Furthermore, even if untempered glass is broken or cracked by an impact, cracks or fissures will not form across the entire surface, ensuring that passengers' vision remains intact in the event of an accident.

[0014] The thicknesses of the first glass plate 10 and the second glass plate 20 may be the same or different. The thickness of the first glass plate 10 may be greater than 1.1 mm and less than 3.5 mm. Furthermore, the thickness of the second glass plate 20 may be greater than 0.5 mm and less than 2.3 mm. Furthermore, the overall thickness of the laminated glass 1 may be greater than 2.3 mm and less than 8.0 mm. Furthermore, the materials, manufacturing methods, etc. of the first glass plate 10 and the second glass plate 20 may be the same or different.

[0015] The material of the intermediate film 30 is not particularly limited, but is preferably a thermoplastic resin. Examples of the material for the intermediate film 30 include thermoplastic resins such as plasticized polyvinyl acetal resins, plasticized polyvinyl chloride resins, saturated polyester resins, plasticized saturated polyester resins, polyurethane resins, plasticized polyurethane resins, ethylene-vinyl acetate copolymer resins, ethylene-ethyl acrylate copolymer resins, cycloolefin polymer resins, and ionomer resins. Furthermore, the resin composition containing a modified hydrogenated block copolymer described in Japanese Patent No. 6065221 is also suitable for use. Among these, plasticized polyvinyl acetal resins are preferably used due to their excellent balance of properties such as transparency, weather resistance, strength, adhesion, penetration resistance, impact energy absorption, moisture resistance, heat insulation, and sound insulation. These thermoplastic resins may be used alone or in combination of two or more. The term "plasticizable" in the plasticized polyvinyl acetal resins means that they can be plasticized by adding a plasticizer. This also applies to other plasticizing resins.

[0016] The interlayer film 30 may be a plasticizer-free resin, such as an ethylene-vinyl acetate copolymer resin. Examples of polyvinyl acetal resins include polyvinyl formal resins obtained by reacting polyvinyl alcohol (PVA) with formaldehyde, polyvinyl acetal resins (in a narrower sense) obtained by reacting PVA with acetaldehyde, and polyvinyl butyral resins (PVB) obtained by reacting PVA with n-butyraldehyde. PVB is particularly preferred due to its excellent balance of properties, including transparency, weather resistance, strength, adhesion, penetration resistance, impact energy absorption, moisture resistance, thermal insulation, and sound insulation. These resins may be used alone or in combination of two or more.

[0017] The interlayer 30 may have a single-layer structure or a multi-layer structure. The interlayer 30 may also have functions other than bonding. For example, the interlayer 30 may have one or more layers selected from a sound insulation layer, a colored transparent layer, an ultraviolet cutoff layer, and an infrared cutoff layer.

[0018] From the perspective of adhesion, the thickness of the intermediate film 30 can be 0.5 mm or greater. From the perspective of lightness and ease of handling, the thickness of the intermediate film 30 can be 3 mm or less. The thickness of the intermediate film 30 can be fixed or can vary depending on the location.

[0019] The method for manufacturing laminated glass 1 includes, for example, the following steps (a) to (c). (a) A first glass plate 10 and a second glass plate 20 are laminated with an intermediate film 30 interposed therebetween to produce a laminate. (b) The laminate is housed inside a container such as a rubber bag, and the interior of the container is heated while being depressurized, so that the first glass plate 10 and the second glass plate 20 are bonded together with the intermediate film 30. The air pressure inside the container is, for example, -100 kPa to -65 kPa based on atmospheric pressure. The heating temperature of the container is, for example, 70°C to 110°C. (c) The laminate taken out of the container is heated at 100°C to 150°C while being press-bonded at a pressure of 0.6 MPa to 1.3 MPa. For example, an autoclave can be used for the pressing. In addition, the method for manufacturing laminated glass 1 may be a conventional method and may not include the above-mentioned step (c).

[0020] like Figure 2 As shown, the laminated glass 1 can be bent entirely or partially to bulge outward from the vehicle. In this case, the first glass plate 10 and the second glass plate 20 can be bent into a desired curvature in one direction or two directions by bending. Figure 1 The laminated glass 1 shown is a multi-curved glass that is curved in the longitudinal and vertical directions of the vehicle, but may also be a single-curved glass that is curved only in the longitudinal or vertical directions. The curvature radius of the laminated glass 1 may be greater than 200 mm and less than 300,000 mm.

[0021] The first and second glass sheets 10, 20 are bent prior to step (a) above. Bending is performed while the glass is softened by heating. The heating temperature for bending is, for example, 550°C to 700°C. The first and second glass sheets 10, 20 may be bent separately or simultaneously superimposed. Bending may involve gravity forming, press forming, or both.

[0022] like Figure 1 As shown, a shielding layer or light-shielding layer 40 may be provided around the periphery of the laminated glass 1 to protect a sealant or the like that bonds and holds the laminated glass 1 to the vehicle body. The shielding layer 40 may be formed, for example, by applying a ceramic color paste of a low-brightness color such as black, gray, or dark brown containing a molten glass frit containing a black pigment and then firing the paste. The shielding layer 40 may be formed on the second surface F2, the third surface F3, and the fourth surface F4 ( Figure 2 ) is preferably formed on one or more surfaces of the second surface F2 and the fourth surface F4 ( Figure 2). The shielding layer 40 can be provided at a distance of at least 10 mm and no more than 300 mm from the peripheral edge of the glass sheet. In this embodiment, the area other than the area covered by the shielding layer 40 formed on the laminated glass (also referred to as the light-blocking area) constitutes the see-through area 5. The see-through area 5 allows passengers in the vehicle 100 to see outside the vehicle 100. In other words, passengers in the vehicle 100 can see outside through the see-through area 5.

[0023] As described above, laminated glass 1 for automobile windows is required to break appropriately to reduce the impact on pedestrians, cyclists, etc. when the car collides with them. For example, laminated glass 1 is required to have a Head Injury Criterion (HIC) below a desired value (e.g., below 1000, preferably below 650).

[0024] Here, the method of breaking the laminated glass 1 when the laminated glass 1 collides with a person will be described. Figure 2 As shown, when a laminated glass 1 collides with a person 200, it is pushed from the outside toward the inside of the vehicle. As a result, tensile stress is generated on the second surface F2, the inside surface of the first glass sheet 10. Therefore, if there are any portions on the second surface F2 that exhibit heterogeneous, altered, or deformed properties compared to the average overall glass (such as scratches, recesses, cracks, or fusion marks), the first glass sheet 10 may break from these portions. Furthermore, tensile stress is also generated on the fourth surface F4, the inside surface of the second glass sheet 20. If there are any portions on the fourth surface F4 that exhibit heterogeneous, altered, or deformed properties compared to the average overall glass, the second glass sheet 20 may break from these portions. Thus, when an impact is applied to a car windowpane from the outside, cracking (destruction) of both the first and second glass sheets 10 and 20 is likely to initiate from the inside of the vehicle and then progress from there to the outside. Furthermore, since the fourth surface F4 , which is the vehicle interior side surface of the second glass sheet 20 , is exposed, the laminated glass 1 as a whole is particularly likely to break starting from the fourth surface F4 .

[0025] Figure 3 FIG. 1 shows a plan view of the laminated glass 1 according to the present embodiment as viewed from the interior of the vehicle. Figure 4 Show Figure 3 AA line cross-sectional view of the laminated glass 1. Figure 3 and Figure 4 , a plurality of deformation portions 50 ( Figure 3 and Figure 4 The deformation portion 50 is a small area where the shape of the surface of the glass plate is changed, and more specifically, a small area where the surface of the glass plate is changed to form a portion that is recessed from the original surface level. Figure 3 As shown, the deformed portions 50 are distributed throughout the laminated glass 1, preferably in the see-through region 5, spaced apart from one another along the planar direction. Due to the distribution of the deformed portions 50, which are minute regions (their size and other details will be discussed later), the laminated glass 1 obtained in this embodiment can prevent obstruction of the passenger's field of vision when viewing the exterior of the vehicle (the exterior of the vehicle) from obstructing the passenger's field of vision (enabling external visibility). Furthermore, the overall impact resistance of the laminated glass 1 can be maintained.

[0026] The deformation portion (also called surface deformation portion) 50 can be formed on one or more surfaces of the first glass plate 10 and the second glass plate 20 of the laminated glass. In particular, as described above, by forming the deformation portion 50 on the inner side surface (second surface F2) of the first glass plate 10 and / or the inner side surface (fourth surface F4) of the second glass plate 20, which are likely to be the first to break when impacted from outside the vehicle, the laminated glass 1 can easily start to break when a person collides with the car, and the impact on the person can be effectively reduced, thereby protecting the person. From the viewpoint of promoting such appropriate initiation of breakage, it is preferred to form the deformation portion 50 on the inner side surface (fourth surface F4) of the second glass plate 20, which is more likely to start to break when impacted from outside the vehicle. In addition, when the deformation portion 50 is formed on both the inner side surface (second surface F2) of the first glass plate 10 and the inner side surface (fourth surface F4) of the second glass plate 20, that is, when the deformation portion 50 is formed on ...fourth surface F4) of the second glass plate 20, the deformation portion 50 is formed on the inner side surface (fourth surface F4) of the second glass plate 20. Figure 3 and Figure 4 As shown, when the deformed portion 50 includes a plurality of first deformed portions 50a formed along the entire surface of the second surface F2 of the first glass plate 10 and a plurality of second deformed portions 50b formed along the entire surface of the fourth surface F4 of the second glass plate 20, the strength of the entire laminated glass 1 can be appropriately reduced. Figure 3 and Figure 4 As shown, since the plurality of first deformed portions 50a and the plurality of second deformed portions 50b are spaced apart and dispersed in the plane direction of the glass sheet, the external visibility of the laminated glass 1 can also be ensured.

[0027] In addition, Figure 3 and Figure 4 In the example shown in FIG. 5 , the first deformable portion 50a and the second deformable portion 50b are each arranged in a lattice shape when viewed from above. However, the arrangement of the deformable portion 50 in the plane direction is not limited to a lattice shape, and may be, for example, a staggered shape. In addition, when observing the arrangement of the entire deformable portion 50 in a top view, that is, when observing the first deformable portion 50a and the second deformable portion 50b together, Figure 3 In the example, the arrangement is in a staggered manner, but the overall arrangement is not limited to the staggered manner, and may be in a grid manner, for example.

[0028] The pitch P1 of the first deformation portion 50a ( Figure 3) is preferably greater than 1 mm and less than 200 mm, more preferably greater than 10 mm and less than 100 mm, and further preferably greater than 20 mm and less than 100 mm. The spacing P1 is the distance between the center position of one first deformation portion 50a and the center position of another first deformation portion 50a arranged closest to it. In addition, the center position of the deformation portion 50 may be the center position of a recess (described later) in the deformation portion 50. The spacing P1 may be uniform throughout the entire perspective area 5, or may vary depending on the location. In the latter case, it is an average value. By making the spacing P1 greater than 1 mm, it is possible to suppress the phenomenon that the first deformation portions 50a are too close to each other, and the compressive stress generated on the surface is continuously distributed in the surface direction, resulting in the glass sheet being less likely to break. On the other hand, by making the spacing P1 less than 200 mm, the first deformation portions 50a, which become the starting point of the breakage, are appropriately distributed on the surface on the inside of the vehicle (the second surface F2), and when an impact is applied from the outside of the vehicle to the laminated glass 1, the laminated glass 1 is more likely to break appropriately.

[0029] The pitch P2 of the second deformable portions 50b is similar to the pitch P1 of the first deformable portions 50a and is preferably between 1 mm and 200 mm, more preferably between 10 mm and 100 mm, and even more preferably between 20 mm and 100 mm. Setting the pitch P2 of the second deformable portions 50b between 1 mm and 200 mm produces the same effects as those of the pitch P1.

[0030] exist Figure 3 and Figure 4 In the example shown, the first deformable portion 50a and the second deformable portion 50b do not overlap when viewed from above. However, the first deformable portion 50a and the second deformable portion 50b may also partially or completely overlap. Furthermore, the first deformable portion 50a and the second deformable portion 50b may be aligned in the thickness direction of the glass sheet, that is, arranged on a straight line parallel to the thickness direction. Overlapping the first deformable portion 50a and the second deformable portion 50b when viewed from above is preferred because it facilitates the development of cracks in the thickness direction of the glass sheet when the laminated glass 1 collides with a person 200.

[0031] Figure 5 (a) shows the Figure 3 The enlarged view of the portion B of one of the deformation portions 50 (the second deformation portion 50b) is shown. Figure 5 (b) shows Figure 5 (a) CC line cross-sectional view. Figure 5 The shapes of the deformed portion 50 shown in (a) and 5 (b) are schematic shapes for easy explanation. Figure 5As shown in (a) and 5(b), the deformed portion 50 includes a concave portion 55 and a crack (crack) 56 formed around the concave portion 55. Such a deformed portion 50 can be formed by, for example, laser irradiation (described in detail later).

[0032] The presence of recessed portion 55 makes it easier to identify the presence of deformed portion 50 during inspection, making it easier to verify whether the deformed portion 50 has been reliably formed on the resulting product. Furthermore, during the bending process for bending the glass sheet, the stress that would close the cracks 56 is dissipated into recessed portion 55, thus preventing the cracks 56 formed around recessed portion 55 from closing. Furthermore, cracks 56 primarily contribute to moderately reducing the strength of the glass sheet, facilitating moderate breakage of the glass sheet in the event of a collision. Furthermore, recessed portion 55 may be formed by laser ablation.

[0033] like Figure 5 As shown in (b), the recess 55 can have a predetermined depth L from the surface of the glass plate (for example, the fourth surface F4 in the case of the deformed portion 50b) and a predetermined diameter d. Here, the diameter d is the diameter when viewed from above, more specifically, the equivalent diameter of the circle of the opening of the recess 55 on the surface. In other words, it is the diameter of a circle having the same area as the area of ​​the recess 55 on the surface. Figure 5 As shown in the schematic diagram (a), when the shape of the recess 55 is circular when viewed from above, the diameter d is the diameter of the recess 55. However, the shape of the recess 55 when viewed from above is not necessarily circular. The diameter d can be calculated by finding the area of ​​the opening of the recess 55 and then using the area. In addition, the depth L is the distance from the surface of the glass plate to the deepest point of the recess 55. Figure 5 In the schematic diagram (b), the cross-sectional shape of the recess 55 cut along the thickness direction of the glass plate is a partial ellipse. However, the cross-sectional shape of the recess 55 may also be a rectangular shape or a partial rectangular shape with a bottom surface. However, the cross-sectional contour of the recess 55 preferably has a continuously changing shape (a curved shape without sharp corners) except for the intersection with the glass plate surface, because this prevents strong light scattering at the corners.

[0034] The ratio of the depth L of the concave portion 55 to the diameter d (L / d) is less than 2. This ensures that the diameter d is large enough to a certain extent, making it easier to confirm the formation of the deformed portion 50 during product inspection. During the bending process of the glass sheet, the stress that closes the crack 56 can be easily dissipated to the concave portion 55, preventing the crack 56 around the concave portion 55 from closing. Figure 6As shown in (b), when the recess 55 is a recess included in the first deformed portion 50a (a recess formed on the first glass plate 10), the surface (second surface F2) where the recess 55 is formed contacts the intermediate film 30. By setting the above ratio (L / d) to be less than 2, the intermediate film 30 can also enter the recess 55, thereby preventing the formation of a cavity between the surface of the recess 55 and the intermediate film 30, or reducing the size of the cavity formed. Figure 6 (a) and Figure 6 (b) Describe.

[0035] Figure 6 (a) shows a partial cross-sectional view of a laminated glass 1' in the prior art, Figure 6 (b) shows a partial cross-sectional view of a laminated glass 1 according to an embodiment of the present invention. Figure 6 (a) and Figure 6 In (b), details of the deformed portion such as the crack are omitted from the illustration, and only the recessed portion is shown. Figure 6 In the existing laminated glass 1' shown in (a), a deformation portion 50' (first deformation portion 50a') is formed on the in-vehicle side surface (second surface F2) of the first glass plate. The ratio of the depth L to the diameter d of the recess 55' included in the deformation portion 50' (L / d) is greater than 2. For a recess 55' of this shape, even if the laminated body formed by laminating the first glass plate 10 and the second glass plate 20 with the intermediate film 30 therebetween is pressed under reduced pressure and / or under heating (the above-mentioned manufacturing steps (b) and (c) of the laminated glass 1), it is difficult for the intermediate film 30 to enter the depth of the recess 55', and a cavity remains between the intermediate film 30 and the recess 55'. Such a cavity will be visible even in the resulting laminated glass 1, and may obstruct the field of vision of the passengers and reduce external visibility. In contrast, Figure 6 In the laminated glass 1 according to one embodiment of the present invention shown in (b), the interlayer film 30 enters the recess 55 and can be in close contact with the surface of the recess 55. Therefore, the cavity between the recess 55 and the interlayer film 30 in the laminated glass 1 is not conspicuous, and the external visibility of the automobile window can be improved.

[0036] The value of the ratio (L / d) is preferably 1 or less, more preferably 0.8 or less, and further preferably 0.5 or less. In addition, the lower limit of (L / d) is not particularly limited, and (L / d) may be greater than 0, for example, 0.05 or more, or 0.1 or more.

[0037] The diameter d of the recess 55 is preferably 10 μm or more and 200 μm or less, more preferably 20 μm or more and 100 μm or less. When the diameter d of the recess 55 is 10 μm or more, the presence of the recess 55 is easily recognizable during inspection or the like, and it is easy to inspect whether the deformation portion 50 is formed on the obtained product. In addition, when the diameter d of the recess 55, which occupies a large area in the deformation portion 50, is 200 μm or less, it is possible to prevent the external visibility from deteriorating when the passengers of the vehicle 100 look outside through the laminated glass 1.

[0038] The depth L of the recess 55 is preferably more than 0 μm and 100 μm or less, more preferably 1 μm or more and 50 μm or less, and further preferably 1 μm or more and 30 μm or less. By having the depth L, the above-described effect of preventing the crack 56 from closing during bending forming is enhanced. In addition, when the depth L is 100 μm or less, particularly when the deformation portion 50 is formed on the second surface F2 of the first glass plate 10, it is easier for the intermediate film 30 to enter the recess 55 ( Figure 6 ), and the void between the recess 55 and the intermediate film 30 is inconspicuous, and the external visibility of the vehicle window can be improved. In addition, the value of the ratio of the depth L to the glass plate thickness (L / glass plate thickness) is preferably 0.001 or more and 0.1 or less, more preferably 0.001 or more and 0.05 or less.

[0039] In addition, when the deformation portion 50 is formed on the second surface F2 of the first glass plate 10 (the case of the first deformation portion 50a), it is preferable that no void or space is formed between the recess 55 and the intermediate film 30, or even if a void or space is formed, the interval between the recess 55 and the intermediate film 30 is smaller than the visible light wavelength.

[0040] The surface (inner surface) of the recess 55 is preferably smooth. For example, the surface roughness Ra of the surface of the recess 55 is preferably smaller than the surface roughness Ra of the second surface F2 of the first glass plate 10. Thereby, the intermediate film 30 entering the recess 55 can closely adhere to the inner surface of the recess 55, and the formation of voids can be further suppressed. In addition, the surface roughness Ra in this specification is the value of the arithmetic mean roughness Ra obtained by the stylus method using a surface roughness measuring instrument in accordance with JIS B0601:1994. Furthermore, the surface of the recess 55 is preferably a smooth fired surface (Japanese: 火づくり面). The fired surface here means a surface formed by the solidification of the molten glass in contact with air by laser irradiation. Therefore, the imaginary temperature near the surface of the recess 55 can be higher than the imaginary temperature of the second surface F2 in the region other than the deformation portion 50.

[0041] As Figure 5As shown in (a), cracks 56 may be formed around recess 55. The number of cracks 56 in a deformed portion 50 may be one or more. The shape and location of cracks 56 are not particularly limited. Cracks 56 may be formed away from recess 55 or connected to and extending from recess 55.

[0042] In addition, it is preferable that one or more cracks 56 reach the surface of the glass sheet in one deformed portion 50. In this case, the opening position of the recessed portion 55 (position on the surface of the glass sheet) in a plan view may be formed away from the recessed portion 55, or may be formed to be connected to the recessed portion 55 and extend from the recessed portion 55.

[0043] When forming the deformed portion 50 by laser irradiation, the cracks 56 extending to the surface of the glass sheet can be easily formed by irradiating the glass sheet with laser light from the bottom surface (described later). Furthermore, the cracks 56 are preferably formed along the circumference of the recessed portion 55 when viewed from above. Furthermore, the cracks 56 are preferably arc-shaped along the circumference of the recessed portion 55 when viewed from above. Furthermore, when the deformed portion 50 is divided into two parts by an arbitrary straight line passing through the center of the deformed portion 50 when viewed from above, the cracks 56 are preferably included on both sides.

[0044] The diameter D of the extended area of ​​the deformed portion 50 when viewed from above is the diameter of the smallest circle including the recess 55 and the cracks 56 around it. The diameter D of the extended area of ​​the deformed portion 50 is preferably greater than 20 μm and less than 200 μm, and more preferably greater than 30 μm and less than 100 μm. When the diameter D is greater than 20 μm, the possibility of the cracks 56 being blocked during the glass sheet bending process can be reduced, and the formation of the deformed portion 50 can be easily seen when inspecting the resulting product. In addition, when the diameter D is less than 200 μm, the deformed portion 50 seen by the passenger is not conspicuous, which can prevent obstruction of the passenger's field of vision, that is, the external visibility of the car window can be improved. In addition, the firmness of the vehicle window under normal circumstances is also easily ensured. In addition, the upper limit of the diameter D of 200 μm is smaller than the black spot size (500 μm) allowed by the Japanese Automotive Standards Organization (JASO) standard.

[0045] The value (D / d) of the ratio of the diameter D of the extended region of the deformed portion 50 to the diameter d of the recessed portion 55 in the plan view is preferably 1.2 to 4, and more preferably 1.2 to 3.

[0046] Figure 7 (a) to 7(c) show modified examples of the deformation portion 50 of this embodiment. Figure 7 (a) is Figure 5 (b) The corresponding figure shows a modified example of the shape of the recess 55. Figure 7 As shown in (a), the direction of the axis Ax of the recess 55 is not necessarily parallel to the normal to the surface of the recess 55 opening; it may also be at an angle θ of 60° or less relative to the normal N. That is, the cross-sectional shape of the recess 55 cut in the thickness direction of the glass sheet may be asymmetrical (or may have an asymmetrical shape) with respect to the normal N passing through the center O of the recess 55. Furthermore, the axis Ax of the recess 55 is a straight line extending from the center O of the recess 55 (the center if the recess 55 opening is circular, or the centroid if the recess 55 opening is non-circular) to the deepest point of the recess 55. The inclination of the axis Ax of the recess 55 relative to the normal N corresponds to the inclination of the laser beam relative to the irradiation direction of the normal N when the deformed portion 50 is formed by laser irradiation.

[0047] Furthermore, the directions of the axis Ax of the recesses 55 of the multiple deformable portions 50 can be distributed. That is, the deformable portion 50 can be formed so that the axis directions of the multiple recesses 55 form various angles relative to the normal direction. For example, the angle of the axis direction of the recess 55 of one deformable portion 50 relative to the normal direction can be different from the angle of the axis direction of the recess 55 of an adjacent deformable portion 50 relative to the normal direction. In this way, different directions of light refraction and scattering can be mixed within the surface of the glass plate, and the possibility of multiple recesses 55 being visible to passengers at the same time can be avoided. Such differences in the inclination of the axis direction of the recesses 55 can be obtained by forming multiple recesses 55 while changing the irradiation direction of the laser. Furthermore, by using a processing device composed of a combination of an electric scanner and a laser, the control of the irradiation direction becomes easy.

[0048] In addition, if Figure 7 As shown in (b) and 7(c), linear cracks (hereinafter also referred to as internal linear cracks 58) separated from the deformed portion 50 can be formed inside the glass plate. Figure 7 (b) shows that in the case of Figure 5 The structure shown in (b) is a structure in which an internal linear crack 58 is formed in the concave portion 55 along the axis Ax which is a normal line passing through the center O of the concave portion 55 . Figure 7 (c) shows that Figure 7 (a) shows a structure in which an internal linear crack 58 is formed at the concave portion 55 of the axis Ax inclined relative to the normal line N. Figure 7 As shown in (b) and (c), the internal linear cracks 58 may be along the axis Ax of the recess 55. The internal linear cracks 58 facilitate the glass sheets, and thus the laminated glass 1 obtained, to break appropriately during a collision, thereby improving the effect of reducing the impact on people.

[0049] The length of the internal linear cracks 58 may be between 100 μm and 1000 μm. By setting the length of the internal linear cracks 58 within the above range, the laminated glass 1 is facilitated to break appropriately during a collision, while also ensuring its durability as a vehicle window under normal circumstances.

[0050] In addition, the dimensions of the deformation portion 50, such as the shape of the deformation portion 50, the diameter d of the recess 55, the depth L, (L / d), the diameter D of the extended area when viewed from above, etc., can be the same or different in the first deformation portion 50a and the second deformation portion 50b.

[0051] When the glass sheets 10 and 20 constituting the laminated glass 1 are float glass, the deformed portion 50 is preferably formed near the surface (hereinafter referred to as the bottom surface) of the two main surfaces of the glass sheet 10 that comes into contact with molten metal, such as molten tin or a molten tin alloy, during manufacturing. This point will be described below.

[0052] The float process is a method of forming molten glass by floating it on a molten metal such as molten tin in a float bath. Here, the bottom surface in contact with the molten tin contains tin near the surface, but the main surface opposite the bottom surface, that is, the top surface not in contact with the molten tin, contains almost no tin. On the top surface, which contains almost no tin, sodium ions in the glass undergo an ion exchange reaction with hydrogen ions in the outside air, gradually forming a surface hydration layer. Because the hardness of the surface hydration layer is low, the top surface becomes less brittle over time, making it difficult for cracks to form or grow. Therefore, even if a deformed portion 50 is formed on the top surface, the breaking strength will increase over time. As a result, when pedestrians and other people collide with cars, the laminated glass 1 is unlikely to begin to break, and there is a possibility that the protective function is insufficient. On the other hand, on the bottom surface containing tin, due to the effect of tin as an asymmetric ion, the ion exchange reaction between hydrogen ions and sodium ions is hindered, making it difficult to form a surface hydration layer. Therefore, by forming a deformed portion 50 near the bottom surface, the breaking strength is less likely to change over time, and the protective function can be maintained for a long time.

[0053] As described above, in this embodiment, it is desirable to form the deformed portion 50 near the bottom surface, which contains a large amount of tin. Therefore, in the manufacture of laminated glass 1, it is preferable to position the glass sheets 10 and 20 so that the inboard side surfaces (the second surface F2 and the fourth surface F4) are the bottom surfaces. Furthermore, the bottom surface, which contains a large amount of metal such as tin, has a significantly higher light absorption rate, particularly in the UV region. Therefore, when forming the deformed portion 50 by laser irradiation, it also offers the advantage of being able to perform the treatment with lower energy irradiation.

[0054] Furthermore, the bottom surface containing a large amount of tin and the top surface containing almost no tin can be distinguished by measuring the tin concentration of both surfaces using, for example, a tin surface detector TinCheck manufactured by Bohle. Alternatively, the bottom surface can be detected by quantitatively measuring the tin concentration using fluorescent X-ray or EPMA to detect a tin-containing layer with a thickness of 5 to 15 μm.

[0055] When determining the distribution of the strength (breaking stress) (calculation method described below) of the in-vehicle side surface (second surface F2 and / or fourth surface F4) of the glass sheet having the deformed portion 50 formed thereon, the laminated glass 1 obtained in this embodiment preferably has a maximum value of 350 MPa or less, more preferably 250 MPa or less. The minimum strength value is preferably 60 MPa or more, more preferably 80 MPa or more. By setting the maximum value below 350 MPa, the laminated glass 1 is more likely to break appropriately during a collision, thereby improving the effect of reducing the impact on people. By setting the minimum value above 60 MPa, damage to the laminated glass 1 by flying stones can be suppressed.

[0056] Furthermore, in the laminated glass 1 of this embodiment, at least in the see-through region 5 , the arithmetic mean roughness Ra of the roughness curve specified in JIS B0601-2013 of the second surface F2 of the first glass sheet 10 and the fourth surface F4 of the second glass sheet 20 may be 0.1 nm to 1000 nm.

[0057] The method for forming the deformable portion 50 is not particularly limited, and includes methods using lasers, electron beam irradiation, and machining. Laser irradiation is preferred. Lasers have high directivity and convergence, and can irradiate with a small spot diameter (the diameter at the focal point). Therefore, localized heating of a small area allows for the formation of the deformable portion 50 with precise dimensions and configuration.

[0058] Figure 8 A processing device 300 for forming the deformed portion 50 is schematically shown. The processing device 300 may include a laser irradiation device 310 and a scanning device 320. The scanning device 320 may be a galvanometer scanner, a polygon scanner, or the like. The direction of the laser beam LB emitted from the laser irradiation device 310 can be adjusted by the scanning device 320. This allows the direction of the laser beam LB to be arbitrarily changed three-dimensionally. For example, even for a curved glass sheet, the laser beam LB can be more reliably irradiated at a desired angle at a desired location on the main surface of the glass sheet.

[0059] In addition, Figure 8In the illustrated example, the laser beam LB is irradiated from the vehicle interior side (fourth surface F4 side) of the second glass sheet 20 constituting the laminated glass 1. However, the laser beam may be irradiated from the vehicle exterior side (third surface F3 side) of the second glass sheet 20 to form the deformed portion 50 on the vehicle interior side. In this case, the irradiation conditions can be set so that the focus is on the vehicle interior side of the glass sheet.

[0060] In the manufacturing process of laminated glass 1, laser LB irradiation can be performed before laminating the glass sheets 10 and 20 (before step (a) described above). Specifically, the laminate can be constructed with the interlayer film 30 interposed therebetween after the deformed portion 50 is formed on the vehicle interior side of the first glass sheet 10 and / or the second glass sheet 20. Alternatively, if the deformed portion 50 formed is the second deformed portion 50b, laser LB irradiation can be performed from the vehicle interior side of the laminated glass 1 after the laminated glass 1 is constructed.

[0061] In the irradiation of laser LB, nonlinear absorption or linear absorption can be used. In the case of nonlinear absorption, the photon density can be between 1×10 8 W / cm 2 Above and 1×10 14 W / cm 2 The following. Nonlinear absorption generates multiphoton absorption. The probability of multiphoton absorption is nonlinear absorption, and increases dramatically with increasing photon density. For example, the probability of two-photon absorption is proportional to the square of the photon density.

[0062] On the other hand, linear absorption generates single-photon absorption at any position in the thickness direction of the glass plate, depending on the photon density. Single-photon absorption is proportional to the photon density. In addition, according to the Lambert-Beer's law, the intensity of the laser light LB decays. That is, if the intensity of the laser light LB changes from I0 to I while the laser light LB moves a distance E (unit [cm]) in the glass plate, the absorption coefficient of the glass plate is set to α (unit [cm]). -1 ]), then the equation I = I0 × exp(-α × E) holds. From the perspective of absorbing laser light LB within the glass sheet, it is preferable to irradiate laser light LB with an absorption coefficient α greater than 0 and less than 100. In the case of linear absorption, even with colored glass, for example, the size and shape of the deformed portion 50 can be easily controlled by appropriately selecting the absorption coefficient α. Furthermore, when linear absorption is used, the deformed portion 50 (recess 55 and crack 56) is easily formed to appear on the surface.

[0063] The conditions for irradiating the laser beam LB depend on the composition of the glass sheets comprising the laminated glass 1, but are not particularly limited as long as the conditions allow the formation of cracks 56 around the recess 55. The laser beam LB preferably has a wavelength that allows at least partial transmission. More specifically, the wavelength of the laser beam LB can be between 250 nm and 5000 nm, preferably between 310 nm and 3000 nm. A wavelength within this range ensures that the absorption coefficient α is within an appropriate range.

[0064] As a light source of the laser, for example, a near-infrared laser such as a Yb fiber laser (wavelength: 1000 nm to 1100 nm), a Yb disk laser (wavelength: 1000 nm to 1100 nm), an Nd:YAG laser (wavelength: 1064 nm), a high-output semiconductor laser (wavelength: 808 nm to 980 nm), etc. can be mentioned. In addition, the light source of the laser can also be a UV laser (wavelength: 310 nm to 360 nm), a green laser (wavelength: 510 nm to 540 nm), a Ho:YAG laser (wavelength: 2080 nm), an Er:YAG laser (2940 nm), a laser using a mid-infrared optical parametric oscillator (wavelength: 2600 nm to 3450 nm), etc. A diode pumped solid state (DPSS) laser combined with a wavelength conversion element can also be used.

[0065] In addition, the laser LB can be irradiated in a pulsed oscillation mode or in a continuous oscillation mode. However, the pulsed oscillation mode is preferred from the perspective of reducing unintentional damage to the vicinity of the irradiation portion. In addition, the pulse operation mode is not particularly limited, but if it is a pulse train mode, high-output irradiation can be performed, thereby shortening the irradiation time and is therefore preferred. In the case of the pulsed oscillation mode, nanosecond pulse lasers, picosecond pulse lasers, femtosecond pulse lasers, etc. can be used.

[0066] Other conditions for laser irradiation include a pulse width of 0.0001 ns to 100 ns, a pulse energy of 10 μJ to 1000 μJ, an irradiation frequency of 1 to 1000 times, and a repetition frequency of 1 kHz to 10000 kHz. Furthermore, the irradiation angle of the laser (the angle at the irradiation position relative to the normal direction of the main surface of the glass plate) may be an angle θ ( Figure 7 (a) The corresponding irradiation angle. The laser irradiation angle and the angle θ of the recess 55 vary depending on the refraction of the laser light on the glass plate surface. This angle difference is easier to calculate than the refractive index of the glass plate. Multiple recesses 55 can be formed on the main surface of the glass plate by varying the laser irradiation angle.

[0067] One embodiment of the present invention is a method for manufacturing a glass plate for an automobile window, wherein a plurality of deformed portions are provided on a surface on the vehicle interior side of the glass plate at intervals along the surface direction, the deformed portions including recessed portions and cracks formed around the recessed portions, and the ratio of the depth of the recessed portions on the surface to the diameter of the recessed portions is less than 2.

[0068] One embodiment of the present invention may be a method for manufacturing a glass sheet for an automobile window, which is a method for manufacturing a glass sheet for an automobile window that includes a first glass sheet, an intermediate film, and a second glass sheet in sequence from the outer side of the vehicle to the inner side of the vehicle, wherein a plurality of deformation portions are provided spaced apart along the surface direction on the inner side of the vehicle of the first glass sheet and / or the second glass sheet, the deformation portions including a recess and cracks formed around the recess, and the ratio of the depth of the recess on the surface to the diameter of the recess is less than 2.

[0069] In the above-described method for manufacturing laminated glass for automotive windows, when forming the deformed portion 50 on both the first and second glass sheets 10, 20, the laminated glass 1 can be obtained by forming the first and second deformed portions 50a, 50b, respectively, on the first and second glass sheets 10, 20, and then laminating the first and second glass sheets 10, 20 with the interlayer film 30 therebetween (e.g., steps (a) to (c) described above). Alternatively, after the bending step, the deformed portion 50 can be formed by irradiating both the first and second glass sheets 10, 20 with laser light. Alternatively, after obtaining the laminated glass 1, the entire transparent region 5 can be scanned with laser light LB twice, for example, with one scan forming the first deformed portion 50a on the vehicle interior side of the first glass sheet 10 and the other scan forming the second deformed portion 50b within the second glass sheet 20. When forming the deformed portion 50 after obtaining the laminated glass 1, the laser irradiation conditions, particularly the laser wavelength, can be adjusted so that the laser light absorptivity at the first and / or second glass sheets is greater than the laser light absorptivity at the interlayer film. This method can prevent the first deforming portion 50a and the second deforming portion 50b from being displaced in a plan view.

[0070] Furthermore, when forming the deformed portion 50 after obtaining the laminated glass 1, the deformed portion 50 can also be formed on both the first glass sheet 10 and the second glass sheet 20 through a single scan of the laser beam LB. In this case, the laser beam LB is focused at two or more different locations on the optical axis of the laminated glass 10, i.e., within both the first glass sheet 10 and the second glass sheet 20, through a single scan. Specifically, it is preferable to use a multifocal lens or a multifocal diffractive optical element to focus the laser beam LB. This reduces the time required for scanning the laser beam LB. This method is suitable for obtaining a structure in which the first deformed portion 50a and the second deformed portion 50b overlap in a plan view.

[0071] In the above-mentioned method for manufacturing laminated glass for automobile windows, laser irradiation may be performed after the bending step of the first and second glass sheets. This prevents the shape and size of the deformed portion 50 from changing during the bending step, thereby preventing changes in function. Example

[0072] The following describes the experimental data. In the following experimental examples, Examples 1 to 4 are examples, and Examples 5 and 6 are comparative examples.

[0073] <Preparation of Samples for Fracture Stress Measurement> (Example 1) A glass sample (100 mm × 100 mm × 2 mm thick) is cut out from a glass plate composed of soda-lime silicate glass obtained by a float process in the same manner as in a conventional mass production process, and a laser is irradiated at 1 position in the center of the surface of the glass sample from the bottom side. Thereby, a deformed portion is formed near the bottom surface of the glass sample. Table 1 shows the laser irradiation conditions. Among the irradiation conditions, "number of irradiations" is the number of laser irradiations. "Irradiation angle" is the angle of the bottom surface of the glass plate at the irradiation position relative to the normal direction. An irradiation angle of 0° means irradiation along the normal direction of the irradiation surface (bottom surface). In Example 1, all deformed portions were formed by laser irradiation at an irradiation angle of 0°.

[0074] The laser processing device used for laser irradiation consists of a laser irradiation device (LD excitation solid-state laser) and a scanning device, namely a Galvano scanner. The laser processing device itself is fixed in position, but a device that can irradiate laser light at various angles is used. The aperture ratio and working distance of the lens are set so that the spot diameter of the laser on the glass plate surface is 1 / e 2 The diameter was 32 μm.

[0075] The glass sample after laser irradiation was placed in an electric heating furnace and subjected to a heating treatment at 658° C. for 200 seconds as a heating treatment equivalent to a conventional bending process.

[0076] (Example 2~Example 4) Glass samples of Examples 2 to 4 were obtained in the same manner as in Example 1, except that the laser irradiation conditions were changed to those shown in Table 1. In Example 3, a deformed portion was formed by laser irradiation at an irradiation angle of 28.00°. While internal linear cracks were observed in the samples of Examples 2 and 3, no internal linear cracks were observed in the sample of Example 4.

[0077] (Example 5) A glass sample was obtained in the same manner as in Example 1 except that the laser beam was not irradiated.

[0078] (Example 6) A glass sample of Example 6 was obtained in the same manner as in Example 1 except that the laser irradiation conditions were changed to those shown in Table 1. In the sample of Example 6, no cracks were formed around the recessed portion, and no linear cracks were formed inside the recessed portion.

[0079] The depth of focus affects the formation of internal linear cracks. The depth of focus is proportional to the square of the laser spot diameter and inversely proportional to the laser wavelength. Examples 1 to 3 had larger spot diameters of 32 to 53 μm, shorter wavelengths of 355 nm, and longer depths of focus. Therefore, the laser light also reached the interior of the glass sample, forming internal linear cracks. On the other hand, in Examples 4 and 6, the spot diameter was smaller at 14 μm, the wavelength was longer at 1064 nm, and the depth of focus was shorter. Therefore, the laser light had difficulty reaching the interior of the glass sample, and no internal linear cracks formed.

[0080] <Measurement of Deformation Part Dimensions, Etc.> A Keyence VHX-6000 digital microscope was used to photograph the deformed portion formed near the bottom surface of each glass sample from the bottom surface side where the deformed portion was formed. The image was used to determine the diameter D of the extended region of the deformed portion and the diameter d of the recessed portion when viewed from above. Furthermore, a one-dimensional analysis was performed using a Keyence VK-X3000 laser microscope to determine the profile of the recessed portion in a cross-section taken along the thickness of the glass sheet. The depth L of the recessed portion was determined from this analysis. Furthermore, the length of the internal linear crack was measured using a Keyence VHX-6000 digital microscope. The results are shown in Table 1.

[0081] in addition, Figures 9 to 13 ( Figure 11 (The upper part) shows the photographic images of one deformed portion of the glass samples of Examples 1 to 4 and 6 (Example 1 is 1000 times, and Examples 2 to 4 and 6 are 2000 times). Figure 11 The lower part shows the analysis results of the concave portion profile of Example 3.

[0082] <Measurement of strength (fracture stress)> Ten glass samples (100 mm × 100 mm × 2 mm thick) prepared as above were prepared, and the strength of each glass sample was measured, which was the breaking stress (MPa). The breaking stress was measured by R30 in accordance with ISO1288-5 (2016). Specifically, a support ring with a diameter of 60 mm and a load ring with a diameter of 12 mm were used, and a load was applied by the load ring at a load rate of 0.3 mm per minute to measure the breaking load. The load was applied from the top side by configuring a load ring on the top side of the glass plate. Furthermore, the breaking stress was calculated using the formula described in ISO1288-5 (2016). The results are shown in Table 1.

[0083] Based on the strength data of the above 10 glass samples, record the maximum and minimum values, and calculate and record the average value.

[0084] As shown in Table 1, in Examples 1 to 4, which had a deformed portion including a recess and cracks formed around it, the maximum breaking stress was below 350 MPa and the minimum was above 60 MPa. On the other hand, in Examples 5 and 6, which did not have a deformed portion including a recess and cracks formed around it, the maximum breaking stress exceeded 350 MPa. Furthermore, in Examples 1 to 3, which had internal linear cracks, the maximum breaking stress was approximately 30 MPa lower than in Example 4, which did not have internal linear cracks. Therefore, the glass sheet was more likely to break moderately when impacted.

[0085] <Preparation of Samples for External Visibility Evaluation> A glass sample (300 mm x 300 mm x 2 mm thick) was cut from a glass plate composed of soda-lime silicate glass obtained by the float process and laser irradiated from the top surface. Irradiation was performed intermittently at 81 locations in a square grid pattern spaced 30 mm apart. The laser irradiation conditions are shown in Table 1. The laser-irradiated glass sample was placed in an electric heating furnace and heated at 658°C for 200 seconds, as a heat treatment equivalent to the conventional bending process.

[0086] Two glass samples that had been laser-irradiated and heated were aligned with their bottom surfaces facing upward, then laminated and pressed together with an interlayer film (PVB resin) interposed between them to create laminated glass. The resulting laminated glass sample consisted of a 2mm-thick glass sample, a 0.76mm-thick interlayer film, and a 2mm-thick glass sample.

[0087] External Visibility Evaluation The resulting laminated glass was placed 400 mm from the evaluator's face, with the inboard side of the glass sheet facing the evaluator's face. The image on the opposite side (outboard side) of the laminated glass was then evaluated under natural light for visibility. The evaluation criteria were as follows. ◎: No bright spots can be seen at all. 0: A few bright spots can be seen in some areas. △: Periodic bright spots are faintly visible overall. ×: Periodic bright spots are strongly visible overall. The evaluation results of each example are shown in Table 1.

[0088] Table 1

[0089] Based on the above, it can be seen that the laminated glass for automobile windows in which multiple deformation portions of Examples 1 to 4 are provided in the surface direction on the inner side of the first glass plate and / or the second glass plate can provide a technology that reduces the impact on people when a car collides with people without preventing passengers in the car from seeing the outside of the car.

[0090] This application claims the benefit of priority based on Japanese Patent Application No. 2023-032021, filed on March 2, 2023, the entire contents of which are incorporated herein by reference. Explanation of symbols

[0091] 1 glass 2 car body 5 Perspective Area 10First Glass Plate 20 Second glass plate 30 interlayer film 40 shielding layers 50, 50' deformation part 50a, 50a' first deformation portion 50b second deformation portion 55, 55' recess 56 cracks 58 internal linear cracks 100 cars 200 people 300 processing equipment 310 laser irradiation device 320 scanning device F1 first page F2 second page F3 third side F4 fourth page LB laser.

Claims

1. A laminated glass for an automobile window, comprising, in order from the vehicle exterior to the vehicle interior, a first glass sheet, an interlayer film, and a second glass sheet, wherein: A plurality of deformed portions are provided on the vehicle interior side surface of the first glass plate and / or the second glass plate at intervals along the surface direction. The deformed portion includes a concave portion and cracks formed around the concave portion. A value of a ratio of a depth of the recessed portion on the surface to a diameter of the recessed portion is 2 or less.

2. The laminated glass for automobile windows according to claim 1, wherein: The diameter of the recessed portion is greater than or equal to 10 μm and less than or equal to 200 μm.

3. The laminated glass for automobile windows according to claim 1, wherein: The depth of the recess is not less than 1 μm and not more than 100 μm.

4. The laminated glass for automobile windows according to claim 1, wherein: A pitch between the deformation portions in a surface direction is greater than or equal to 1 mm and less than or equal to 200 mm.

5. The laminated glass for automobile windows according to claim 1, wherein: The cracks reach the surface.

6. The laminated glass for automobile windows according to claim 1, wherein: Internal linear cracks are formed at positions spaced apart from the deformed portion in the thickness direction.

7. The laminated glass for automobile windows according to claim 1, wherein: The axis directions of the plurality of recessed portions have different angles with respect to the normal direction.

8. The laminated glass for automobile windows according to claim 1, wherein: The first glass sheet and / or the second glass sheet having the deformed portion formed thereon is float glass, The surface of the first glass sheet and / or the second glass sheet on the vehicle interior side is a surface that comes into contact with the molten metal in the float bath.

9. The laminated glass for automobile windows according to claim 1, wherein: The deformed portion is provided on the first glass plate and the second glass plate, The deformed portion provided on the first glass plate and the deformed portion provided on the second glass plate overlap with each other in a plan view.

10. An automobile comprising: The laminated glass for automobile windows according to any one of claims 1 to 9; and A vehicle body includes an opening for installing the laminated glass for an automobile window.

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