Laminated glass, laminated glass for vehicle, and laminated glass for vehicle windshield

Abstract

To provide a laminated glass which can provide a dark intermediate film at a more accurate position.SOLUTION: A laminated glass 100 has a first glass plate 10, an intermediate film 20, and a second glass plate 30 in this order, has a dark ceramic layer 40 on a second surface or a fourth surface, and has a dark intermediate film 50 between the first glass plate 10 and the intermediate film 20 or between the intermediate film 20 and the second glass plate 30, wherein the dark ceramic layer 40 has an optical opening 40b whose at least a part is not closed by the dark ceramic layer 40, the dark intermediate film 50 has an information acquisition part 50a enabling at least one of reception and transmission of information using a sensor and is provided at a position corresponding to the optical opening 40b possessed by the dark ceramic layer 40, and the dark ceramic layer 40 and the dark intermediate film 50 have at least three sets of positioning structures used for positioning the dark intermediate film 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminated glass, a laminated glass for a vehicle, and a laminated glass for a vehicle windshield. [Background technology]

[0002] In recent years, technology has been developed to mount ADAS (Advanced Driver-Assistance Systems) cameras on the window glass of vehicles and other moving objects. Dark ceramic is sometimes printed on the top of vehicle windshields. Printing dark ceramic on the glass can make it difficult to suppress the optical distortion of the glass, which occurs in the boundary area between the information transmission / reception area of the glass, i.e., the optical aperture, and the dark ceramic, to a level required by the ADAS camera. Therefore, technology has been developed to install a dark interlayer film in the area where the ADAS camera is to be mounted, rather than printing dark ceramic on the area.

[0003] For example, Patent Document 1 discloses a technique for suppressing optical distortion by providing a dark intermediate film instead of dark ceramic around a portion corresponding to an optical aperture. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-513473 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to mount the camera in an accurate position, it is preferable that the dark interlayer be provided in an accurate position. However, Patent Document 1 does not disclose a mechanism for positioning the dark interlayer.

[0006] In view of the above problems, an object of the present invention is to provide a laminated glass, a laminated glass for a vehicle, and a laminated glass for a vehicle windshield, in which a dark interlayer film can be provided in a more accurate position. [Means for solving the problem]

[0007] A laminated glass, a laminated glass for a vehicle, and a laminated glass for a vehicle windshield according to one aspect of the present disclosure have the following configuration.

[0008] [1] A laminated glass having a first glass plate, an interlayer film, and a second glass plate in this order, the surface of the first glass plate facing the interlayer film is a second surface, a surface of the first glass plate facing the second surface is a first surface, the surface of the second glass plate facing the interlayer film is a third surface, a surface of the second glass plate facing the third surface is a fourth surface, a dark ceramic layer on the second surface or the fourth surface; a dark-colored interlayer film is disposed between the first glass sheet and the interlayer film or between the interlayer film and the second glass sheet; the dark ceramic layer has an optical aperture at least a portion of which is not closed by the dark ceramic layer; the dark intermediate film has an information acquisition unit capable of at least one of receiving and transmitting information using a sensor, and is provided at a position corresponding to the optical aperture of the dark ceramic layer; The dark ceramic layer and the dark interlayer have at least three sets of positioning structures used to position the dark interlayer; Laminated glass.

[0009] [2] the dark ceramic layer has at least one island portion and at least two protrusions as the positioning structures; The dark intermediate film has at least one hole and at least two recesses as the positioning structures. [1] The laminated glass according to [1].

[0010] [3] The island portion has an area larger than that of the hole portion, The convex portion has a larger area than the concave portion. [2] The laminated glass according to [2].

[0011] [4] The area of each island is 19 mm 2 That's all, The area of each hole is 18 mm 2 That's all. [2] or [3].

[0012] [5] The area of each of the protrusions is 10 mm 2 That's all, The area of each recess is 9 mm 2 That's all. The laminated glass according to any one of [2] to [4].

[0013] [6] The island portion has a circular, elliptical, or polygonal shape, The convex portion has a polygonal shape. The laminated glass according to any one of [2] to [5].

[0014] [7] The dark intermediate film is provided so as to cover the dark ceramic layer at an edge in contact with the dark ceramic layer. The laminated glass according to any one of [1] to [6].

[0015] [8] The dark intermediate film is made of a thermoplastic resin. The laminated glass according to any one of [1] to [7].

[0016] [9] The thickness of the dark intermediate film is 20 μm or more and 80 μm or less. The laminated glass according to any one of [1] to [8].

[0017]

[10] The color difference ΔE between the dark intermediate film and the dark ceramic layer is within 10.0. The laminated glass according to any one of [1] to [9].

[0018]

[11] A laminated glass for vehicles, comprising the laminated glass according to any one of [1] to

[10] .

[0019]

[12] A laminated glass for a vehicle windshield, comprising the laminated glass according to any one of [1] to

[10] . [Effects of the Invention]

[0020] The present invention can provide a laminated glass, a laminated glass for a vehicle, and a laminated glass for a vehicle windshield, in which a dark interlayer film can be provided in a more accurate position. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a front view showing an example of laminated glass according to an embodiment. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a front view showing an example of a dark ceramic layer included in the laminated glass according to the embodiment. [Figure 4] FIG. 1 is a front view showing an example of a dark interlayer film included in a laminated glass according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. For ease of understanding, the scale of each part in the drawings may differ from the actual scale. Directions such as parallel, right-angled, orthogonal, horizontal, vertical, up-down, left-right, and so on are permissible to the extent that they do not impair the effects of the embodiments. The shape of the corners is not limited to right angles and may be rounded like an arch. Parallel, right-angled, orthogonal, horizontal, and vertical may include substantially parallel, substantially right-angled, substantially orthogonal, substantially horizontal, and substantially vertical. In this specification, the term "periphery" refers to a region having a certain width extending from the outer edge to the center or from the inner edge to the outside. In this specification, the term "substantially" refers to a state in which a person perceives the same shape and dimensions.

[0023] FIG. 1 is a front view showing an example of laminated glass according to the present embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 . As shown in FIG. 2 , laminated glass 100 according to the present embodiment includes a first glass sheet 10, an interlayer film 20, a second glass sheet 30, a dark ceramic layer 40, and a dark interlayer film 50. The laminated glass 100 includes the first glass sheet 10, the interlayer film 20, and the second glass sheet 30, in this order. In FIG. 2 , because the dark interlayer film 50 is thin, the space between the interlayer film 20 and the first glass sheet 10 is actually filled with the interlayer film 20. However, the laminated glass 100 shown in FIG. 2 is a simplified schematic diagram for ease of understanding. The laminated glass 100 is used, for example, as window glass for vehicles such as automobiles. The laminated glass 100 is suitable for use as a vehicle windshield from the perspective of installing an ADAS camera. When the laminated glass 100 is installed in a vehicle, the first glass sheet 10 faces the exterior of the vehicle and the second glass sheet 30 faces the interior of the vehicle.

[0024] Hereinafter, the vehicle exterior side of the first glass sheet 10, i.e., the side opposite the interlayer film 20, may be referred to as the "first side." The vehicle exterior side of the first glass sheet 10 facing the interlayer film 20, i.e., the side opposite the first side, may be referred to as the "second side." The vehicle interior side of the second glass sheet 30, i.e., the side opposite the third side, may be referred to as the "fourth side." The type of glass constituting the first glass sheet 10 and the second glass sheet 30 is not particularly limited. The first glass sheet 10 and the second glass sheet 30 may be, for example, soda-lime glass, quartz glass, borosilicate glass, or alkali-free glass. The first glass sheet 10 and the second glass sheet 30 may be colorless or colored. The first glass sheet 10 and the second glass sheet 30 may have a coating or the like applied to their surfaces to perform a specific function. In terms of the mass of the laminated glass, the thickness of each of the first glass sheet 10 and the second glass sheet 30 is preferably 4 mm or less, more preferably 3.5 mm or less, more preferably 3 mm or less, and even more preferably 2.5 mm or less. In terms of the strength of the laminated glass and the handleability of the glass sheets, the thickness of each of the first glass sheet 10 and the second glass sheet 30 is preferably 0.5 mm or more, more preferably 1 mm or more, and even more preferably 1.5 mm or more. In terms of the strength of the laminated glass, it is preferable that the thickness of the first glass sheet 10 is thicker than the thickness of the second glass sheet 30. The first glass sheet 10 and the second glass sheet 30 may have stress due to a tempering treatment. The laminated glass 100, and the first glass sheet 10 and the second glass sheet 30 may have a curved shape. The first glass sheet 10 and the second glass sheet 30 may be float glass. In this case, it is preferable that the tin surface is located on the second and fourth sides.

[0025] The material constituting the interlayer film 20 is not particularly limited. The interlayer film 20 may be made of, for example, a resin. Examples of resins constituting the interlayer film 20 include polyvinyl butyral (PVB), polyvinyl chloride, ethylene vinyl acetate (EVA), cycloolefin polymer, urethane resin, and polyvinylidene fluoride (PVDF). However, polyvinyl butyral is preferred in terms of the performance of the laminated glass, such as penetration resistance. Furthermore, polyvinyl butyral is preferably plasticized by adding a plasticizer. Furthermore, polyvinyl butyral may have a multilayer structure consisting of three or more layers with a core layer containing a relatively large amount of plasticizer. With this structure, the sound insulation of the laminated glass 100 is good. The interlayer film 20 may be colorless or colored.

[0026] The dark ceramic layer 40 is a dark, opaque layer. The dark ceramic layer 40 is a shielding layer known as a "black ceramic" and blocks at least a portion of the sun's rays. The dark ceramic layer 40 is formed, for example, by applying a printing ink containing a heat-resistant dark pigment, a low-melting-point glass powder, a resin, and a solvent to predetermined locations on the first glass plate 10 or the second glass plate 30 and baking the ink. The dark ceramic layer 40 is usually provided on the second or fourth surface. In the example shown in FIG. 2, the dark ceramic layer 40 is provided on the second surface.

[0027] The dark interlayer film 50 is a sheet-like member including a substrate 51 and a dark film 52. The substrate 51 is made of, for example, a transparent resin, and may be made of a thermoplastic resin. Resins that can be used to form the substrate 51 include polyvinyl acetal, polyvinyl chloride, ethylene vinyl acetate (EVA), cycloolefin polymer, urethane resin, and polyvinylidene fluoride (PVDF). Polyvinyl acetal, particularly polyvinyl butyral (PVB), is preferred due to its excellent adhesive properties. The dark film 52 is formed by applying a printing ink containing a heat-resistant dark pigment and a solvent to the substrate 51. The thickness of the dark interlayer film 50 is preferably 20 μm to 80 μm, more preferably 23 μm to 70 μm, more preferably 25 μm to 60 μm, more preferably 25 μm to 40 μm, and even more preferably 27 μm to 35 μm. The dark interlayer film 50 is provided between the first glass sheet 10 and the interlayer film 20 or between the interlayer film 20 and the second glass sheet 30. In the example shown in FIG. 2 , the dark interlayer film 50 is provided between the first glass sheet 10 and the interlayer film 20. The dark interlayer film 50 is laminated by being aligned and attached to the glass sheet on which the dark ceramic layer 40 is formed. In the example shown in FIG. 2 , the dark interlayer film 50 is positioned and attached to the first glass sheet 10 on which the dark ceramic layer 40 is formed, using a positioning structure (described later) as a guide.

[0028] The shape of the dark ceramic layer 40 will be described in detail with reference to FIG. 3. FIG. 3 is a front view showing an example of a portion around an optical opening of the dark ceramic layer 40 included in the laminated glass 100. As shown in FIG. 3, the dark ceramic layer 40 includes an optical opening 40b. The optical opening 40b is an area where the dark ceramic layer 40 is not formed. At least a portion of the optical opening 40b is not closed by the dark ceramic layer 40. In other words, the dark ceramic layer 40 is formed so that at least a portion of the edge of the optical opening 40b is open. In the example shown in FIG. 3, one side of the rectangular optical opening 40b is open. By opening at least a portion of the optical opening 40b, optical distortion of the laminated glass 100 in the area where the optical opening 40b is formed is further suppressed.

[0029] The dark ceramic layer 40 has at least three positioning structures. Providing at least three positioning structures makes it extremely simple and easy to prevent misalignment in the plane direction when laminating the dark interlayer film 50. Misalignment in the plane direction of the dark interlayer film 50 can have a significant adverse effect on the ADAS camera, particularly on the camera's viewing angle. In the example shown in FIG. 3 , the dark ceramic layer 40 has one island portion 40c and two protrusions 40d and 40e as positioning structures. The island portion 40c is a dark ceramic layer provided in a position that does not contact other portions of the dark ceramic layer 40. The island portion 40c may be provided within the optical aperture 40b, as shown in FIG. 3 , but is preferably provided in the peripheral region of the optical aperture 40b. The shape of the island portion 40c is not particularly limited. From the viewpoint of facilitating alignment of the dark interlayer film 50, a circular, elliptical, or polygonal shape is preferred. The area of the island portion 40c is set to 19 mm from the viewpoint of ensuring sufficient visibility for the worker when laminating the dark color intermediate film 50. 2 More than 25mm is preferable. 2 More than 40mm is more preferable. 2 The above is more preferable. In addition, the area of the island portion 40c is set to 60 mm 2 Less than 50mm is preferable 2 Less than 45mm is preferable2 The following is even more preferred:

[0030] The protrusions 40d, 40e are dark ceramic layers provided so as to protrude from the edges of the dark ceramic layer 40. For example, as shown in FIG. 3, the protrusions 40d, 40e may be provided so as to protrude toward the optical aperture 40b at the edges of the dark ceramic layer 40. By providing the protrusions 40d, 40e on the left and right sides of the optical aperture 40b as shown in FIG. 3, lateral misalignment can be suppressed when the dark interlayer 50 is laminated. The shape of the protrusions 40d, 40e is not particularly limited. From the viewpoint of facilitating the alignment of the dark interlayer 50, the shape of the protrusions 40d, 40e is preferably polygonal, and may be triangular, for example. The area of the protrusions 40d, 40e is set to 10 mm or less from the viewpoint of ensuring sufficient visibility when laminating the dark interlayer 50. 2 More than 15mm is preferable. 2 More than 20mm is more preferable. 2 Furthermore, the area of the convex portions 40d and 40e is set to 40 mm from the viewpoint of suppressing distortion to the optical aperture. 2 Less than 30mm is preferable 2 Less than 25mm is preferable 2 The following is even more preferable. Furthermore, the convex portions 40d, 40e may have the same or different shapes and may have the same or different areas. For example, if the convex portions 40d, 40e have different shapes or areas, it is easy to distinguish the front and back of the dark interlayer 50, which has concave portions corresponding to the shapes.

[0031] The shape of the dark interlayer 50 will be described in detail with reference to FIG. 4. FIG. 4 is a front view showing an example of a dark interlayer 50 included in a laminated glass 100. As shown in FIG. 4, the dark interlayer 50 includes an information acquisition section 50a. As shown in FIG. 2, the information acquisition section 50a is an area where the dark film 52 is not formed on the substrate 51. In other words, the information acquisition section 50a is a transparent section provided within the dark interlayer 50. The laminated glass 100 is typically used with a device attached that sends and receives information using a sensor such as an ADAS camera. The information acquisition section 50a functions as an area where a device attached to the laminated glass 100 can send and receive information.

[0032] The dark interlayer 50 has at least three positioning structures. The positioning structures of the dark interlayer 50 are areas on the substrate 51 where the dark film 52 is not formed. The positioning structures of the dark interlayer 50 interlock with the positioning structures of the dark ceramic layer 40. That is, the dark ceramic layer 40 and the dark interlayer 50 each have at least three interlocking positioning structures. This prevents misalignment in the planar direction when the dark interlayer 50 is laminated. In the example shown in FIG. 4 , the dark interlayer 50 has one hole 50c and two recesses 50d and 50e as positioning structures. The hole 50c is provided in the dark interlayer 50. The hole 50c is a positioning structure that is paired with the island portion 40c. The shape of the hole 50c is not particularly limited. From the viewpoint of facilitating the alignment of the dark interlayer 50, the shape of the hole 50c is preferably circular, elliptical, or polygonal. The area of the hole 50c is set to 18 mm from the viewpoint of ensuring sufficient visibility when laminating the dark color intermediate film 50. 2 More than 24mm is preferable. 2 More than 39mm is preferable. 2 The above is more preferable. From the viewpoint of ease of matching with the remaining dark ceramic, the area of the hole 50c is set to 59 mm 2 Less than 49mm is preferred 2 Less than 44mm is preferable 2 The following is even more preferred:

[0033] The recesses 50d, 50e are recessed from the edge of the dark interlayer 50 toward the center. The recess 50d is a positioning structure that is paired with the protrusion 40d. The recess 50e is a positioning structure that is paired with the protrusion 40e. By providing the recesses 50d, 50e on the left and right sides of the dark interlayer 50 as shown in FIG. 4, lateral misalignment can be suppressed when the dark interlayer 50 is laminated. The shape of the recesses 50d, 50e is not particularly limited. From the viewpoint of facilitating the alignment of the dark interlayer 50, a polygonal shape is preferable. The area of the recesses 50d, 50e is 9 mm 2 More than 14mm is preferable. 2 More than 19mm is preferable. 2 The above is more preferable. In addition, the area of the recesses 50d and 50e is set to 39 mm from the viewpoint of ease of matching with the remaining dark ceramic. 2 Preferably less than 29mm 2 Less than 24mm is preferable 2 The following is more preferable: The recesses 50d and 50e may have the same or different shapes, and may have the same or different areas.

[0034] Next, returning to FIG. 1 , the shapes of the dark ceramic layer 40 and the dark interlayer film 50 will be described in more detail. FIG. 1 is a view of the laminated glass 100 as seen from the vehicle exterior. As shown in FIG. 1 , the laminated glass 100 positions the dark interlayer film 50 so that the three sets of positioning structures fit together. As shown in FIG. 1 , the island portion 40c preferably has a larger area than the hole portion 50c. Furthermore, the convex portions 40d and 40e preferably have a larger area than the concave portions 50d and 50e. This configuration can suppress light transmission through the edges of the positioning structures provided on the dark interlayer film 50 when the laminated glass 100 is laminated. Furthermore, as shown in FIG. 1 , the dark interlayer film 50 is preferably laminated so that the dark film 52 and the dark ceramic layer 40 overlap at the edge that contacts the dark ceramic layer 40. That is, the dark interlayer film 50 is preferably laminated so that the edge that contacts the dark ceramic layer 40 covers the dark ceramic layer 40. This configuration can suppress light transmission between the dark interlayer 50 and the dark ceramic layer 40. From the standpoint of achieving reliable concealment, the overlap width between the dark film 52 and the dark ceramic layer 40 is preferably 10 mm or more, and more preferably 15 mm or more.

[0035] Furthermore, from the viewpoint of improving the appearance of the laminated glass 100 when laminated, the color difference ΔE between the dark ceramic layer 40 and the dark film 52 is preferably 10.0 or less. Here, the color difference ΔE is measured under light source C in the CIE 1976 (L*a*b*) color system according to the method described in JIS Z 8781-4 (2013). The color difference ΔE is more preferably 10 or less, and even more preferably 7 or less. [Example]

[0036] Next, an embodiment of the present invention will be described. As samples according to the examples, samples of a dark ceramic layer and a dark interlayer film provided in laminated glass were prepared by the following method.

[0037] First, a ceramic paste was applied by screen printing to predetermined locations on the second surface of the first glass plate and fired at a high temperature to form a dark ceramic layer. One island portion and two protrusions were formed in the dark ceramic layer. The areas of each island portion and protrusion in Examples 1 to 5 are shown in Table 1. The ceramic paste contained a black pigment and glass frit.

[0038] Next, black ink was printed on a substrate made of polyvinyl styrene to prepare a dark interlayer film. One hole and two recesses were formed in the dark interlayer film. The areas of each hole and recess in Examples 1 to 5 are shown in Table 1. The thickness of the dark interlayer film was 30 μm. The applied area of the dark interlayer film was 900 cm. 2 It was.

[0039] <Evaluation> To evaluate the samples prepared in this way, visibility was evaluated assuming the task of stacking each component. Specifically, four operators looked at each positioning structure and judged whether or not they could perform the stacking task. If all operators judged that the task was possible, the result was rated as "Good," i.e., visibility was good. If one to three operators judged that the task was possible, the result was rated as "Good," i.e., visibility was somewhat poor. If all operators judged that the task was impossible, the result was rated as "Poor," i.e., visibility was poor.

[0040] The following Table 1 shows the evaluation results of the samples according to Examples 1 to 5. Examples 1 to 3 are comparative examples, and Examples 4 and 5 are working examples.

[0041] [Table 1]

[0042] As shown in Table 1, the area of the hole is 18 mm 2 In Examples 3 to 5, the visibility of the hole was good. 2In Examples 1, 4 and 5, the visibility of the recesses was good. 2 or more, and the area of the recess is 9mm 2 In the above Examples 4 and 5, the visibility of the three positioning structures was good, and it was confirmed that it was possible to accurately laminate the dark interlayer film in the specified position while visually checking each positioning structure during the lamination work.

[0043] The present invention has been described above in accordance with the above-mentioned embodiment, but the present invention is not limited to the configuration of the above-mentioned embodiment, and naturally includes various modifications, alterations, and combinations that a person skilled in the art can make within the scope of the invention as defined in the claims of this application. [Explanation of symbols]

[0044] 100 Laminated Glass 10 First glass plate 20 Interlayer 30 Second glass plate 40 dark ceramic layer 40b optical aperture 40c Shimabe 40d, 40e convex part 50 Dark Interlayer 50a Information Acquisition Section 50c hole 50d,50e recess 51 Base material 52 Dark Film

Claims

1. A laminated glass having a first glass plate, an interlayer film, and a second glass plate in this order, a surface of the first glass plate facing the interlayer film is a second surface, a surface of the first glass plate facing the second surface is a first surface, a surface of the second glass plate facing the interlayer film is a third surface; a surface of the second glass plate facing the third surface is a fourth surface, a dark ceramic layer on the second surface or the fourth surface; a dark-colored interlayer film is disposed between the first glass sheet and the interlayer film or between the interlayer film and the second glass sheet; the dark ceramic layer has an optical aperture at least a portion of which is not closed by the dark ceramic layer; the dark intermediate film has an information acquisition unit capable of at least one of receiving and transmitting information using a sensor, and is provided at a position corresponding to the optical aperture of the dark ceramic layer; The dark ceramic layer and the dark interlayer have at least three sets of positioning structures used to position the dark interlayer; Laminated glass.

2. the dark ceramic layer has at least one island portion and at least two protrusions as the positioning structures; The dark intermediate film has at least one hole and at least two recesses as the positioning structures. The laminated glass according to claim 1.

3. The island portion has an area larger than that of the hole portion, The convex portion has a larger area than the concave portion. The laminated glass according to claim 2.

4. The area of each island is 19 mm ２ That's all, The area of each hole is 18 mm ２ That's all. The laminated glass according to claim 2 or 3.

5. The area of each of the protrusions is 10 mm ２ That's all, The area of each recess is 9 mm ２ That's all. The laminated glass according to claim 2 or 3.

6. The island portion has a circular, elliptical, or polygonal shape, The convex portion has a polygonal shape. The laminated glass according to claim 2 or 3.

7. The dark intermediate film is provided so as to cover the dark ceramic layer at an edge in contact with the dark ceramic layer. The laminated glass according to any one of claims 1 to 3.

8. The dark intermediate film is made of a thermoplastic resin. The laminated glass according to any one of claims 1 to 3.

9. The thickness of the dark intermediate film is 20 μm or more and 80 μm or less. The laminated glass according to any one of claims 1 to 3.

10. The color difference ΔE between the dark intermediate film and the dark ceramic layer is within 10.

0. The laminated glass according to any one of claims 1 to 3.

11. A laminated glass for vehicles, comprising the laminated glass according to any one of claims 1 to 3.

12. A laminated glass for a vehicle windshield, comprising the laminated glass according to any one of claims 1 to 3.

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