Glass plate structure and method for manufacturing glass plate structure

Abstract

The glass plate assembly includes a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate. At least one of the first plate and the second plate is a glass plate. The first plate and the second plate are both plates with curved surfaces, each surface having a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The concave main surface of the first plate and the convex main surface of the second plate coincide opposite to each other. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate.

Description

Technical Field

[0001] This invention relates to a glass plate structure and a method for manufacturing a glass plate structure. Background Technology

[0002] If a raw material with a high sound propagation speed (hard and lightweight) is used as the diaphragm for a loudspeaker or microphone, the resonant frequency of the diaphragm's split vibration increases, resulting in better sound quality across a wider frequency range. Therefore, glass, a raw material with a high sound propagation speed, has attracted considerable attention as a diaphragm material. Furthermore, although sounds above 20kHz are difficult for the human ear to hear, a strong sense of presence is felt, thus requiring faithful reproduction of high-frequency sounds. For example, Patent Document 1 describes a glass plate structure in which a liquid layer is disposed between at least one pair of plates, designed to provide good acoustic performance even in such high-frequency bands.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2017 / 175682 Summary of the Invention

[0006] In the case where the glass plate assembly described in Patent Document 1 has a curved shape, the overlapping plates also have curved shapes. Therefore, when the plates are overlapped, shape errors in the glass assembly occur depending on the direction of overlap, such as whether the concave sides of the curved shapes are overlapped opposite each other or the convex sides are overlapped opposite each other. For example, if the convex side of one plate is overlapped opposite the concave side of another plate, the gap between the plates tends to widen at the outer edges, and the relative positions of the plates become unstable. Furthermore, depending on the situation, there is a concern that cracks or peeling may occur in the sealing portion that seals the outer edges of the plates.

[0007] If air enters the pair of glass plates from the outer edge of the structure, the air bubbles will mix into the liquid layer, significantly impairing their appearance. Furthermore, the bubbles will create a damping effect, causing the vibrations of the two plates to have different amplitudes, thus reducing acoustic performance. Additionally, the internal pressure and size of the bubbles will vary depending on the ambient temperature, making it difficult to achieve good sound reproduction.

[0008] Therefore, the object of the present invention is to provide a glass plate structure and a method for manufacturing the glass plate structure that reduces the shape error after a pair of plates are overlapped and prevents air from entering from the outer edge of the plates.

[0009] The present invention comprises the following components.

[0010] (1) A glass plate assembly comprising a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate.

[0011] The first and second plates mentioned above are plates with curved surfaces, each having a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface.

[0012] The concave main surface of the first plate and the convex main surface of the second plate are opposite to each other and overlap.

[0013] The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate.

[0014] (2) A method for manufacturing a glass plate component, the glass plate component comprising a first plate and a second plate disposed overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate.

[0015] The first and second plates mentioned above are both plates with curved surfaces. Each curved surface has a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate.

[0016] The manufacturing method includes:

[0017] An intermediate layer of liquid agent and sealant is provided on at least a portion of the concave main surface of the first plate.

[0018] A laminate is obtained by bonding the concave main surface of the second plate, which contains the intermediate layer liquid and sealant, to the convex main surface of the plate.

[0019] The above-mentioned laminated body was subjected to decompression.

[0020] According to the present invention, air can be prevented from entering from the outer edge of the sheet, thereby reducing shape errors after a pair of sheets are bonded together. Attached Figure Description

[0021] Figure 1A It is a schematic cross-sectional view of the glass plate structure.

[0022] Figure 1B This is a schematic cross-sectional view of other glass plate components.

[0023] Figure 2AThis is a schematic diagram illustrating the steps involved in manufacturing a glass plate assembly.

[0024] Figure 2B This is a schematic diagram illustrating the steps involved in manufacturing a glass plate assembly.

[0025] Figure 2C This is a schematic diagram illustrating the steps involved in manufacturing a glass plate assembly.

[0026] Figure 2D This is a schematic diagram illustrating the steps involved in manufacturing a glass plate assembly.

[0027] Figure 3A This is a reference diagram showing other examples of overlapping the first and second plates.

[0028] Figure 3B This is a reference diagram showing other examples of overlapping the first and second plates.

[0029] Figure 4 It indicates measurement Figure 3A , Figure 3B The diagram shown is a contour plot of the gap distribution between the first and second plates when they are bonded together.

[0030] Figure 5 It indicates measurement Figure 1A and Figure 1B The diagram shown is a contour plot of the gap distribution between the first and second plates when they are bonded together. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0032] The glass plate assembly of the present invention comprises a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate. The intermediate layer may include a liquid layer, may consist only of a liquid layer, or may consist only of a solid phase structure. At least one of the first plate and the second plate is a glass plate. The first plate and the second plate are each a plate with a curved surface, having a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The concave main surface of the first plate and the convex main surface of the second plate coincide opposite to each other, and the concave surface of each plate coincides with the convex surface. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate, thereby making the gap at the center thicker than the gap at the outer edge of each plate.

[0033] With the above configuration, the first and second plates overlap with reduced gaps at their outer edges, improving the stability of the overlapping plates and reducing shape errors. Furthermore, the thickness of the central portion of the intermediate layer is greater than the thickness of its outer edges, and the gaps between the plates at their outer edges are small. Therefore, air is less likely to enter the intermediate layer from the outer edges of the plates. Consequently, the glass plate structure of the present invention does not retain air bubbles within the plate surface, reducing unevenness in the liquid layer thickness within each plate surface.

[0034] The following describes a specific example of the structure of a glass plate assembly.

[0035] Figure 1A It is a schematic cross-sectional view of the glass plate structure.

[0036] The glass plate assembly 100 includes a first plate 11, a second plate 13, and an intermediate layer 15 disposed between the first plate 11 and the second plate 13, which are arranged overlappingly in the thickness direction. The first plate 11 and the second plate 13 have the same shape when viewed from above. Therefore, the outer edges 17 of the overlapping first plate 11 and the second plate 13 are disposed inwardly at overlapping positions. It should be noted that the first plate 11 and the second plate 13 may also have different shapes when viewed from above.

[0037] The first plate 11 and the second plate 13 each have a certain thickness and each has a convex main surface 11a, 13a protruding in the thickness direction and a concave main surface 11b, 13b opposite to the convex main surfaces 11a, 13a. The concave main surface 11b of the first plate 11 and the convex main surface 13a of the second plate 13 are opposite to each other and coincide. The radius of curvature R1 of the concave main surface 11b of the first plate 11 is smaller than the radius of curvature R2 of the convex main surface 13a of the second plate 13. As a result, the thickness direction spacing t of the stacked first plate 11 and second plate 13 widens from the outer edge 17 of the glass plate structure 100 towards the center.

[0038] The term "central portion" as used here can be exemplified by the portion (region) encompassing the center of gravity of the glass plate structure 100 when the glass plate structure 100 is placed with the concave side of the second plate 13 facing each other on a plane, as viewed from above (from a viewpoint in the normal direction of the plane). For example, if the area of ​​the glass plate structure 100% in the view from above is set to 100%, the central portion can be a continuous region encompassing the center of gravity and having an area 30% closer to the outer edge 17. The central portion can also be a continuous region of 20%, 10%, or 5% under the above conditions. The glass plate structure 100 can be a structure in which the interval t in the thickness direction gradually increases from the outer edge 17 towards the central portion in the view from above, or it can be a structure that gradually increases towards the center of gravity.

[0039] Furthermore, the gap between the outer edges 17 of the first plate 11 and the second plate 13 is smaller than the gap at the center of the plate surface. The gap between the outer edges 17 of the first plate 11 and the second plate 13, which extends over the entire circumference, is preferably 0.5 mm or less, more preferably 0.4 mm or less, even more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less.

[0040] A sealing portion 19 is provided at the outer edge of the first plate 11 and the second plate 13 to join the first plate 11 and the second plate 13 together, and the intermediate layer 15 is sealed in the internal space surrounded by the sealing portion 19.

[0041] Figure 1B It is a schematic cross-sectional view of other glass plate components, and Figure 1A The identical parts of the glass plate component 100 shown are labeled with the same numbers and their descriptions are omitted. Figure 1B The glass plate assembly 101 shown has a first solid layer 31 between the first plate 11 and the intermediate layer 15, and a second solid layer 33 between the second plate 13 and the intermediate layer 15. It should be noted that the glass plate assembly 101 may have only one of the first solid layer 31 and the second solid layer 33, or both. For example, if either the first plate 11 or the second plate 13 is a glass plate, a solid layer may be provided between the glass plate and the intermediate layer 15. Furthermore, if both the first plate 11 and the second plate 13 are glass plates, it is preferable to have both the first solid layer 31 and the second solid layer 33.

[0042] The first solid layer 31 and the second solid layer 33 can be made of resin materials, composite materials, fiber materials, metal materials, etc., and are not limited to a single layer; they can also be multiple layers. Preferably, they contain resin materials, or can be composed of resin materials. Examples of resin materials include PMMA-based resins, PI-based resins, PC-based resins, PS-based resins, PET-based resins, cellulose-based resins, PVA resins, and PVB resins. Furthermore, it is preferable that the first solid layer 31 and the second solid layer 33 are transparent in the visible light region, and a certain thickness is sufficient. The thickness of the first solid layer 31 and the second solid layer 33 can be thinner than that of the first substrate 11 and the second substrate 13, for example, it can be 2 mm or less, preferably 1 mm or less, and more preferably 800 μm or less. There is no particular limitation on the lower limit of the thickness of the first solid layer 31 and the second solid layer 33; for example, it can be 100 nm or more.

[0043] Thus, the glass plate assembly 101, by having at least one of the first solid layer 31 and the second solid layer 33, achieves the effect of preventing shards from flying when the glass plate breaks. In particular, when the first plate 11 and the second plate 13 are glass plates, it is easy to obtain the effect of resistance to penetration when the glass plate breaks, which is therefore preferred. It should be noted that the first solid layer 31 can be provided on the entire convex surface of the first plate 11, or it can be provided on the portion other than the outer edge portion 17 where the sealing portion 19 is provided. Similarly, the second solid layer 33 can be provided on the entire concave surface of the second plate 13, or it can be provided on the portion other than the outer edge portion 17 where the sealing portion 19 is provided.

[0044] Figures 2A to 2D This is a schematic diagram illustrating the steps involved in manufacturing the glass plate assembly 100.

[0045] In the glass plate component 100 constructed as described above, firstly, as... Figure 2A As shown, the first plate 11 is arranged with its concave main surface 11b facing upwards. Figure 2B As shown, an intermediate layer liquid agent 21 and a sealant 23 are applied to the concave main surface 11b to form an intermediate layer 15. Here, the sealant 23 is applied to the outer edge 17 of the concave main surface 11b, and the intermediate layer liquid agent 21 is applied to a plate surface that is further inward than the outer edge 17 of the concave main surface 11b coated with the sealant 23. In addition to coating, the intermediate layer liquid agent 21 and the sealant 23 can also be applied by other methods such as spraying or transfer.

[0046] It should be noted that when manufacturing a glass plate assembly 101 having at least one of a first solid layer 31 and a second solid layer 33, the manufacturing process can be carried out after preparing at least one of a plate having the first solid layer 31 attached to the concave main surface 11b of the first plate 11 and a plate having the second solid layer 33 attached to the convex main surface 13a of the second plate 13. Figures 2A to 2D The process can be completed in one step.

[0047] Next, as Figure 2C As shown, the convex side surface 13a of the second plate 13 is disposed opposite the concave side main surface 11b of the first plate 11 coated with intermediate layer liquid agent 21 and sealant 23, and the second plate 13 is bonded to the first plate 11. Then, the bonded laminate is subjected to depressurization, as shown... Figure 2D As shown, a glass plate structure 100 is obtained by filling the space between the first plate 11 and the second plate 13 with an intermediate layer liquid agent 21 and a sealant 23.

[0048] Figure 3A , Figure 3B This is a reference diagram of other examples where the first and second plates overlap.

[0049] Figure 3A , Figure 3B In the first plate 11A and the second plate 13A shown, the relationship between the radii of curvature is reversed; the radius of curvature R1 of the concave main surface 11b of the first plate 11A is larger than the radius of curvature R2 of the convex main surface 13a of the second plate 13A. In this case, as... Figure 3A As shown, the central portion of the convex main surface 13a of the second plate 13A is closest to the concave main surface 11b of the first plate 11A, and the gap δ in the thickness direction widens at the outer edge 17. In this state, the relative position of the first plate 11A and the second plate 13A is unstable, and the manufacturing deviation increases when manufacturing a multi-plate assembly.

[0050] Furthermore, if the first plate 11A and the second plate 13A are bonded together in this state via the intermediate layer 15, then as follows Figure 3B As shown, at the outer edge 17, the sealing portion 19 thickens, forming a recess 25 facing the center of the plate surface. Depending on its size, the recess 25 may sometimes extend to the intermediate layer 15, in which case air enters the intermediate layer 15 and bubbles are generated within it.

[0051] Figure 4 It indicates measurement Figure 3A , Figure 3B The diagram shown is a contour map illustrating the gap distribution between the first plate 11A and the second plate 13A when they are bonded together. This gap can be calculated by measuring the height distribution of the concave main surface 11b of the first plate 11A and the height distribution of the convex main surface 13a of the second plate 13A, and then determining the height difference between corresponding positions within the plate surfaces based on these measurements. The height distribution can be measured using methods such as point-to-point measurement with a contact sensor, non-contact measurement with a laser sensor, or analysis of image data captured from various directions by multiple cameras. An appropriate method can be used depending on the object being measured and other conditions.

[0052] exist Figure 4 In the case shown, the gap is small in the center of the board surface and becomes larger closer to the outer edge of the board surface. That is, the seal 19 is prone to peeling at the outer edge of the board surface, and air bubbles can easily enter the intermediate layer.

[0053] The gap created at the outer edge 17 of the first plate 11 and the second plate 13 is filled by the coated intermediate layer 15 (intermediate layer liquid 21) and the sealing part 19 (hereinafter also referred to as coating liquid), and the gap is also reduced by the deflection of the plates to each other. Furthermore, the seal of the gap is maintained by the viscosity of the coating liquid and the viscous frictional resistance between the first plate and the second plate.

[0054] According to Newton's law of viscosity, the shorter the distance from the interface between the coating liquid and the substrate, the greater the viscous frictional resistance of the coating liquid between the substrates. For example, in a coating liquid with a viscosity of 3 Pa·s, if the gap is less than 100 μm, the viscous friction coefficient (apparent viscosity) increases exponentially; if the gap is 10 μm, the apparent viscosity becomes more than 30 times greater than that of the 100 μm case.

[0055] In the glass plate assembly 100 of this configuration, the gap between the first plate 11 and the second plate 13 at the outer edge 17 is assumed to be at least 100 μm or less, preferably 50 μm or less, more preferably 30 μm or less, further preferably 20 μm or less, even more preferably 15 μm or less, and particularly preferably 10 μm or less, regardless of the thickness of each plate. Therefore, the outer edge 17, after the air bubbles are expelled from the central portion, is significantly affected by the viscous frictional resistance between the coating liquid and the plate.

[0056] On the other hand, in such Figure 3A , Figure 3B When the first plate 11A and the second plate 13A shown have opposite radii of curvature, a gap is created at the outer edges 17 of the first plate 11A and the second plate 13A, resulting in the plates not meshing with each other. As force is applied to each plate, the plates flex towards each other in the opening direction, widening the gap. Although the increase in gap can be compensated by the volume of the coating liquid, its viscosity, and frictional resistance, the coating liquid is a viscous substance, and even a high-viscosity coating liquid cannot prevent its flow. Furthermore, the wider the gap, the lower the frictional resistance, the more active the flow of the coating liquid, and the less able it is to suppress the plate flexing.

[0057] Therefore, a viscosity was considered that the coating liquid could withstand the degree of bending of the board, but the viscosity actually needed to be several tens of times higher than usual. Consequently, when expelling air bubbles, the gas could not pass through the coating liquid (sealing part), and the air bubbles could not be expelled.

[0058] Furthermore, when the volume of the coating liquid is increased until the substrate is no longer flexed, the frictional resistance becomes almost zero, and the coating liquid moves easily. As a result, liquid dripping and misalignment of the substrates can easily occur, creating gaps at the ends of the substrate.

[0059] Thus, in combinations with opposite radii of curvature, it is extremely difficult to ensure the tightness of the gap at the outer edge 17, making it difficult to obtain a glass plate structure with a good appearance.

[0060] In contrast, Figure 1A and Figure 1BWhen the glass plate components 100 shown overlap, the gap becomes smaller the closer to the outer edge 17 from the center of the plate, and the frictional resistance of the coating liquid is greatest at the front end. Therefore, leakage of the coating liquid is prevented, and the coating liquid is not crushed when expelling air bubbles, so air bubbles can be smoothly expelled through the coating liquid (sealing part 19).

[0061] It should be noted that when the thickness of the first plate 11 and the second plate 13 is in the range of 1.8mm to 3.0mm, it will not have a significant impact on the aforementioned flexural strength (Young's modulus of the raw material).

[0062] Figure 5 It indicates measurement Figure 1A and Figure 1B The image shows a contour plot illustrating the gap distribution between the first plate 11 and the second plate 13 when they are bonded together. The method for measuring the gap is similar to... Figure 4 The same situation applies. In Figure 5 In the case shown, the gap in the center of the board increases, and the gap decreases as it approaches the outer edge of the board. Therefore, air bubbles are less likely to enter the intermediate layer from the outer edge of the board.

[0063] according to Figure 1A and Figure 1B The glass plate assembly 100 shown, when the intermediate layer 15 includes a liquid layer, differs from the case where a pair of plates are joined together by an adhesive layer. Because of this liquid layer, the surfaces of the first plate 11 and the second plate 13 are not fixed to each other, thus maintaining their respective vibrational characteristics. For example, if the first plate 11 resonates, the second plate 13 does not resonate due to the presence of the intermediate layer (liquid layer) 15, or the resonant oscillation of the second plate 13 can be attenuated. Therefore, the glass plate assembly 100 has a higher loss coefficient compared to the case of a single plate.

[0064] In the first plate 11 and the second plate 13, it is preferable that the peak values ​​of the resonant frequencies of one plate and the other plate are different, and more preferably, the ranges of the resonant frequencies do not overlap. However, even if the ranges of the resonant frequencies of the first plate 11 and the second plate 13 overlap, or the peak values ​​are the same, due to the presence of the intermediate layer (liquid layer) 15, even if one plate resonates, the vibration of the other plate is not synchronized. Therefore, the resonance can be canceled to a certain extent, and a higher loss coefficient can be obtained compared with the case of a single plate.

[0065] That is, when the resonant frequency (peak) of one plate is set to Qa and the half-peak width of the resonant amplitude is set to wa, and the resonant frequency (peak) of another plate is set to Qb and the half-peak width of the resonant amplitude is set to wb, the following relationship [Equation 1] is preferably satisfied.

[0066] (wa+wb) / 4<|Qa-Qb|···[Formula 1]

[0067] The larger the value on the left side of [Equation 1], the greater the difference in resonant frequencies (|Qa-Qb|) between the plates, and the higher the loss coefficient can be obtained, which is therefore preferred.

[0068] Therefore, it is more preferable to satisfy the following [Equation 2], and even more preferable to satisfy the following [Equation 3].

[0069] (wa+wb) / 2<|Qa-Qb|···[Formula 2]

[0070] (wa+wb) / 1<|Qa-Qb|···[Formula 3]

[0071] It should be noted that the resonant frequency (peak) and half-peak width of the resonant amplitude of the plate can be determined using the same method as the loss coefficient of the glass plate structure.

[0072] The smaller the mass difference between the first plate 11 and the second plate 13, the better; more preferably, there is no mass difference. When a mass difference exists between the plates, the heavier plate can suppress the resonance of the lighter plate, but it is difficult to suppress the resonance of the heavier plate with the lighter plate. That is, because when there is a deviation in the mass ratio, the difference in inertial forces means that, in principle, they cannot cancel each other out for resonant vibrations.

[0073] The mass ratio of the first plate 11 to the second plate 13 (first plate 11 / second plate or second plate / first plate) is preferably 0.8 to 1.25 (8 / 10 to 10 / 8), more preferably 0.9 to 1.1 (9 / 10 to 10 / 9), and even more preferably 1.0 (10 / 10).

[0074] The thinner the thickness of both the first plate 11 and the second plate 13, the easier it is for the plates to bond together through the intermediate layer (liquid layer) 15. Furthermore, the plates can vibrate with less energy. Therefore, in applications such as diaphragms for loudspeakers, thinner plates are preferred. Specifically, the thickness of plates 11 and 13 is preferably 15 mm or less, more preferably 10 mm or less, even more preferably 5 mm or less, even more preferably 3 mm or less, particularly preferably 1.5 mm or less, and particularly more preferably 0.8 mm or less. On the other hand, if the plates are too thin, the effects of surface defects become more pronounced, cracks are more likely to form, or strengthening processes become difficult. Therefore, the thickness of plates 11 and 13 is preferably 0.01 mm or more, more preferably 0.05 mm or more.

[0075] In addition, in applications for opening components in buildings and vehicles where the generation of abnormal sounds caused by resonance is suppressed, the thicknesses of the first plate 11 and the second plate 13 are preferably 0.5 mm to 15 mm, more preferably 0.8 mm to 10 mm, and even more preferably 1.0 mm to 8 mm.

[0076] In the application of glass substrates for magnetic recording media with improved vibration resistance, the thicknesses of the first plate 11 and the second plate 13 are preferably 0.3 mm to 1.2 mm, more preferably 0.4 mm to 1.0 mm, and even more preferably 0.5 mm to 0.8 mm.

[0077] For at least one of the first plate 11 and the second plate 13, the one with the larger loss coefficient results in greater vibration attenuation as part of the glass plate structure, making it preferred for use as a vibrating plate. Specifically, the loss coefficient of the plate at 25°C is preferably 1×10⁻⁶. －4 The above is preferred to be 3×10 － 4 or higher, further preferably 5×10 －4 That's all. There is no specific upper limit to the loss coefficient; however, from the perspective of productivity and manufacturing costs, a value of 5 × 10⁻⁶ is preferred. －3 Furthermore, it is preferable that both the first plate 11 and the second plate 13 have the aforementioned loss coefficients.

[0078] For at least one of the first plate 11 and the second plate 13, the plate with the higher longitudinal wave velocity value in the thickness direction exhibits improved sound reproducibility in the high-frequency range, making it preferred for use as a vibrating plate. Specifically, the longitudinal wave velocity value of the plate is preferably 5.5 × 10⁻⁶. 3 m / s or higher, more preferably 5.7 × 10 m / s. 3 m / s or higher, more preferably 6.0 × 10 m / s. 3 m / s or higher. There is no specific upper limit, but considering the productivity of the sheet metal and the cost of raw materials, 7.0 × 10⁻⁶ is preferred. 3 Below m / s. Furthermore, it is more preferable that both the first plate 11 and the second plate satisfy the aforementioned sound velocity value.

[0079] In the glass plate composition 100 described above, at least one of the plates 11 and 13 is made of glass. Here, "glass plate" refers to inorganic glass and plexiglass. Plexiglass is typically made of PMMA-based resins, PC-based resins, PS-based resins, PET-based resins, cellulose-based resins, etc., which are known as transparent resins.

[0080] The raw material for the other sheet is arbitrary and can be various materials such as resin sheets made of resins other than plexiglass, metal sheets such as aluminum, ceramic sheets, etc. From the perspectives of design, processability, and weight, plexiglass, resin materials, composite materials, fiber materials, and metal materials are preferred. From the perspective of vibration characteristics, inorganic glass, high-rigidity composite materials, fiber materials, metal materials, and ceramic materials are preferred.

[0081] As the resin material, resin materials that can be molded into flat plates or curved panels are preferred. As the composite material or fiber material, resin materials incorporating high-hardness fillers, carbon fibers, Kevlar fibers, etc., are preferred. As the metallic material, aluminum, magnesium, copper, silver, gold, iron, titanium, stainless steel (SUS), etc., are preferred, and other alloy materials can be used as needed.

[0082] As ceramic materials, Al2O3, SiC, Si3N4, AlN, mullite, zirconium oxide, yttrium oxide, YAG, and other ceramic and single-crystal materials are preferred. Furthermore, for ceramic materials, those with light transmittance are particularly preferred.

[0083] When inorganic glass is used in a glass plate that constitutes at least one sheet, its composition is not particularly limited, but is preferably within the following range, for example, by mass percentage based on oxides.

[0084] SiO2: 40–80% by mass, Al2O3: 0–35% by mass, B2O3: 0–15% by mass, MgO: 0–20% by mass, CaO: 0–20% by mass, SrO: 0–20% by mass, BaO: 0–20% by mass, Li2O: 0–20% by mass, Na2O: 0–25% by mass, K2O: 0–20% by mass, TiO2: 0–10% by mass, and ZrO2: 0–10% by mass. The above components account for more than 95% by mass of the total glass.

[0085] The composition of the inorganic glass plate is more preferably within the following range.

[0086] SiO2: 55–75% by mass, Al2O3: 0–25% by mass, B2O3: 0–12% by mass, MgO: 0–20% by mass, CaO: 0–20% by mass, SrO: 0–20% by mass, BaO: 0–20% by mass, Li2O: 0–20% by mass, Na2O: 0–25% by mass, K2O: 0–15% by mass, TiO2: 0–5% by mass, and ZrO2: 0–5% by mass. The above components constitute more than 95% by mass of the total glass.

[0087] The lower the specific gravity of both the first plate 11 and the second plate 13, the less energy is required to vibrate the plates. Specifically, the specific gravity of the first plate 11 and the second plate 13 is preferably 2.8 or less, more preferably 2.6 or less, and even more preferably 2.5 or less. There is no particular limitation on the lower limit, but it is preferably 2.2 or more.

[0088] The higher the specific elastic modulus (obtained by dividing Young's modulus by density) of both the first plate 11 and the second plate 13, the greater the rigidity of the plates. Specifically, the preferred specific elastic modulus of the first plate 11 and the second plate 13 are 2.5 × 10⁻⁶.7 m 2 / s 2 The above is preferred, with 2.8×10 being more desirable. 7 m 2 / s 2 The above is further preferred to be 3.0×10 7 m 2 / s 2 That's all. There's no specific upper limit, but 4.0 × 10 is preferred. 7 m 2 / s 2 the following.

[0089] The curved surfaces of the first plate 11 and the second plate 13 can be a single curved surface or multiple curved surfaces with various radii of curvature. In short, the glass plate assembly 100, when viewed from above, can have a composite curved shape that bends in both the intersecting first and second directions, or a single curved shape that bends only in the first direction or only in the second direction. Furthermore, either the first plate 11 or the second plate 13 can have a composite curved shape while the other has a single curved shape, as long as the radius of curvature of the concave main surface of the first plate 11 is smaller than the radius of curvature of the convex main surface of the second plate 13. It should be noted that the first and second directions can be mutually orthogonal directions when the glass plate assembly 100 is viewed from above.

[0090] (The intermediate layer uses liquid and sealant)

[0091] In the glass plate assembly 100 of this configuration, at least a portion of the main surface (concave main surface 11b) of one of the pairs of plates (e.g., the first plate 11) is coated with an intermediate layer liquid agent 21 and a sealant 23.

[0092] The intermediate layer liquid (hereinafter also referred to as liquid) 21 is the material of the intermediate layer 15 constituting the glass plate body 100.

[0093] From the viewpoint of achieving a high loss coefficient for the glass plate component 100, the viscosity coefficient of the liquid agent 21 at 25°C is preferably 1×10⁻⁶. 3 Pa·s or less. Furthermore, the viscosity coefficient at 25°C is preferably 1×10⁻⁶. －4 Pa·s or higher. If the viscosity is too low, it is difficult to transmit vibrations; if it is too high, the pair of plates on both sides of the intermediate layer 15 become fixed to each other, exhibiting vibrational behavior as a single plate, thus making it difficult to attenuate resonant vibrations. A viscosity coefficient of 1 × 10⁻⁶ is more preferable. －3 Pa·s or higher, more preferably 1×10 －2 Pa·s or higher. Furthermore, 1×10⁻⁶ is more preferred. 2The viscosity coefficient is below 1 Pa·s, and more preferably below 1 × 10 Pa·s. This viscosity coefficient can be determined by a rotational viscometer or the like.

[0094] Furthermore, from the viewpoint of achieving a high loss coefficient for the glass plate assembly 100, the surface tension of the liquid agent 21 at 25°C is preferably 15 N / m to 80 mN / m. If the surface tension is too low, the adhesion between the plates decreases, making it difficult to transmit vibrations. If the surface tension is too high, the pair of plates located on both sides of the intermediate layer (liquid layer) tend to adhere to each other, exhibiting vibration behavior as a single plate, thus making it difficult to attenuate resonant vibrations. A surface tension of 20 mN / m or more is more preferred, and 30 mN / m or more is even more preferred. This surface tension can be measured using methods such as the ring method.

[0095] When the intermediate layer 15 is a liquid layer, if the vapor pressure is too high, there is a concern that the intermediate layer (liquid layer) 15 may evaporate and fail to function as the glass plate component 100. Therefore, the vapor pressure of the intermediate layer liquid agent 21 at 25°C and 1 atm is preferably 1 × 10⁻⁶. 4 Pa or less, more preferably 5×10 Pa 3 Pa or less, more preferably 1×10 3 Below Pa.

[0096] Preferably, the intermediate layer (liquid layer) 15 is chemically stable and does not react with the first plate 11 and the second plate 13. Chemical stability means, for example, minimal denaturation (deterioration) due to light exposure, or at least no solidification, vaporization, decomposition, discoloration, or chemical reaction with glass within a temperature range of -20°C to 70°C.

[0097] As an intermediate layer liquid agent 21, examples include water, oil, organic solvents, liquid polymers, ionic liquids and mixtures thereof.

[0098] More specifically, examples include propylene glycol, dipropylene glycol, tripropylene glycol, common silicone oils (dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil), modified silicone oils, acrylic polymers, liquid polybutadiene, glycerol paste, fluorinated solvents, fluorinated resins, acetone, ethanol, xylene, toluene, water, mineral oils, and mixtures thereof. Preferably, it contains at least one selected from propylene glycol, dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, and modified silicone oil; more preferably, it is mainly composed of propylene glycol or silicone oil. Furthermore, by using silicone oil as the main component, the intermediate layer (liquid layer) 15 readily dissolves air, thus suppressing bubble formation, which is therefore preferable.

[0099] From the viewpoint of being able to impart design and functionality such as coloring and fluorescence to the glass plate component 100, the intermediate layer liquid agent 21 can be a slurry containing dispersed powder, and may also contain fluorescent materials.

[0100] The powder content in the intermediate layer liquid agent 21 is preferably 0% to 10% by volume, more preferably 0% to 5% by volume. From the viewpoint of preventing sedimentation, the particle size of the powder is preferably 10 nm to 1 μm, more preferably 10 nm to 0.5 μm.

[0101] The sealant 23 is applied to prevent leakage of the liquid and to prevent peeling at the interface between the glass plate and the liquid layer.

[0102] The sealant 23 needs to be able to withstand the weight of the boards when applied to them without dripping, and also needs to be strong enough to withstand the weight of the boards when they are bonded together. From this perspective, the viscosity coefficient at 25°C is preferably 1×10⁻⁶. －1 Pa·s or higher, more preferably 1 Pa·s or higher. Furthermore, from the viewpoint of good coating operability, the ability to coat with a certain degree of leveling and a narrow sealing width, the viscosity coefficient at 25°C is preferably 1×10⁻⁶. 3 Pa·s or less, more preferably 1×10 2 Pa·s and below.

[0103] Furthermore, from the viewpoint of effectively removing air bubbles from the intermediate layer (liquid layer) 15, the viscosity coefficient of the sealant 23 is preferably higher than that of the liquid agent 21. When removing air bubbles remaining in the intermediate layer (liquid layer) 15 during the decompression process described later, if the viscosity coefficient of the sealant 23 is higher than that of the liquid agent 21, it is easier to ensure a flow path for bubble movement.

[0104] Examples of sealants 23 include rubbers, resins, gels, etc., which have high elasticity.

[0105] Regarding the resins used in sealants, acrylic, cyanoacrylate, epoxy, silicone, urethane, and phenolic resins can be used. Curing methods include one-component, two-component mixed, heat-curing, UV-curing, and visible light curing.

[0106] Thermoplastic resins (hot melt adhesives) can also be used as sealants 23. Examples include ethylene vinyl acetate resins, polyolefin resins, polyamide resins, synthetic rubber resins, acrylic resins, and polyurethane resins.

[0107] Regarding rubber, for example, natural rubber, synthetic natural rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber, nitrile rubber, ethylene-propylene rubber, chloroprene rubber, acrylic rubber, chlorosulfonated polyethylene rubber (Hypalon), urethane rubber, silicone rubber, fluororubber, ethylene-vinyl acetate rubber, epichlorohydrin rubber, polysulfide rubber (Thiokol), and hydrogenated nitrile rubber can be used.

[0108] It should be noted that the order of applying liquid agent 21 and sealant 23 is not limited. Liquid agent 21 can be applied first to the portion of the concave main surface 11b of the first plate 11 where the intermediate layer is to be formed, and sealant 23 can be applied in a manner that surrounds its outer periphery. Alternatively, sealant 23 can be applied first to the concave main surface 11b of the first plate 11, and liquid agent 21 can be applied to its inner periphery.

[0109] The coating pattern of liquid agent 21 is not particularly limited; it can be coated in a layered manner, or in a dotted, grid-like, or striped pattern. Among these, a dotted pattern is preferred from the viewpoint of easily ensuring a flow path for bubble removal.

[0110] In addition, the coating thickness of liquid agent 21 can be appropriately set in such a way that the thickness of intermediate layer 15 is within the desired range, preferably 5μm to 500μm.

[0111] The sealant 23 is preferably applied in a manner that surrounds the outer periphery of the liquid agent 21. In this case, the area of ​​the sealant application portion is preferably 20% or less of the area of ​​the liquid agent application portion, more preferably 10% or less, and particularly preferably 5% or less, so as not to impede vibration.

[0112] From the viewpoint of easily ensuring the flow path for bubble discharge, the coating thickness of sealant 23 is preferably greater than that of liquid agent 21, preferably 10 μm to 1000 μm.

[0113] As a coating method for liquid agent 21 and sealant 23, known methods such as screen printing and dispensers can be used.

[0114] (A laminate made by bonding together sheet materials)

[0115] A laminate is obtained by bonding the concave main surface 11b of the first plate 11, which is coated with an intermediate layer of liquid agent 21 and sealant 23, to the second plate 13.

[0116] Bonding is preferably performed under normal pressure. In depressurized bonding, it is difficult to maintain good positional accuracy between the two sheets under depressurized conditions, and it is difficult to stack them without misalignment. However, by bonding under normal pressure, the two sheets can be stacked with good positional accuracy.

[0117] It should be noted that in the laminate, the sheet material is prone to deformation, and the sealant 23 softens due to heat, making it difficult to ensure the flow path for bubble discharge and degassing. Therefore, it is preferable not to heat the laminate during the bonding process.

[0118] (Decompression degassing of laminates)

[0119] The laminate obtained above is subjected to reduced pressure. Thus, even if air bubbles are present in the intermediate layer (liquid layer) 15 during the application of liquid agent 21 and during the bonding of the boards, the air bubbles will gradually move to the outer edge of the boards and be released to the outside of the laminate.

[0120] Specifically, the laminate is preferably supplied in an atmosphere of 100 Pa or less, more preferably 50 Pa or less. Furthermore, the supply time also depends on the degassing rate, and is preferably 1 minute to 180 minutes.

[0121] Furthermore, from the viewpoint of effectively releasing bubbles through rapid decompression, the time required to reach a pressure of 100 Pa or less is preferably within 30 minutes, more preferably within 15 minutes, and particularly preferably within 10 minutes.

[0122] It should be noted that, as a method for subjecting the laminate to reduced pressure, examples include using a depressurization chamber, placing the laminate in a bag made of rubber or similar material, and degassing the bag.

[0123] From the viewpoint of being able to quickly decompress, the volume of the decompression chamber (L) / the exhaust capacity of the decompression chamber (L / min) is preferably 1.8 or less, more preferably 1.5 or less, and even more preferably 0.9 or less.

[0124] (Pressure on the laminate)

[0125] The laminated material after depressurization is preferably pressurized. This allows air that cannot be completely expelled by depressurization alone to be forced out from the intermediate layer (liquid layer) 15. Examples of pressurization methods include temporary pressing of the laminated material using rollers and pressing using an autoclave. The pressure inside the autoclave is preferably 0.1 MPa to 10 MPa, and the pressing time is preferably 1 minute to 30 minutes.

[0126] (Sealant cured)

[0127] The sealant 23 can be cured as needed. This reliably prevents leakage of the intermediate layer (liquid layer) 15.

[0128] The curing method can be appropriately selected based on the material of the sealant 23. If the sealant 23 is a light-curing resin, it can be cured by irradiation with light such as ultraviolet light; if it is a thermosetting resin, it can be cured by heating.

[0129] (Intermediate layer cured)

[0130] The intermediate layer (liquid layer) 15 obtained from the intermediate layer liquid agent 21 can be cured as needed. In particular, if curing is carried out after degassing, there is no air residue in the intermediate layer 15 which is composed of a solid phase, which is therefore preferred.

[0131] The curing method for the intermediate layer 15 can be appropriately selected based on the material of the sealant 23. Furthermore, the liquid agent used for the intermediate layer can be the same material as the sealant. If the sealant 23 is a light-curing resin, it can be cured by irradiation with light such as ultraviolet light; if it is a thermosetting resin, it can be cured by heating. Alternatively, the sealant 23 can also be a moisture-based condensation-type resin.

[0132] <Glass Plate Composition>

[0133] From the perspective of maintaining high rigidity and transmitting vibration, the thinner the thickness of the intermediate layer 15, the better. From this point of view, when the total thickness of a pair of plates is 1 mm or less, the thickness of the intermediate layer 15 is preferably 1 / 10 or less of the total thickness of the pair of plates, more preferably 1 / 20 or less, even more preferably 1 / 30 or less, even more preferably 1 / 50 or less, even more preferably 1 / 70 or less, and particularly preferably 1 / 100 or less.

[0134] Furthermore, when the combined thickness of a pair of plates exceeds 1 mm, the thickness of the intermediate layer 15 is preferably 100 μm or less, more preferably 50 μm or less, even more preferably 30 μm or less, even more preferably 20 μm or less, even more preferably 15 μm or less, and particularly preferably 10 μm or less. From the viewpoint of film-forming properties and durability, the lower limit of the thickness of the intermediate layer 15 is preferably 0.01 μm or more.

[0135] Furthermore, at the outer edge of the glass plate component, in the longitudinal direction of the glass plate component, it is preferable that the thickness of the sealant in the region from the outer edge to the center 1 / 3 of the glass plate component is 0.5 mm or less. In this way, by forming a strip-shaped sealing portion with a sealant thickness of 0.5 mm or less, air inflow into the intermediate layer (liquid layer) can be reliably prevented.

[0136] Therefore, the present invention is not limited to the above-described embodiments. Combining the various components of the embodiments with each other, making changes and applications based on the description in the specification and known technologies by those skilled in the art are also intended operations of the present invention and are included within the scope of protection.

[0137] The aforementioned glass plate structure is formed by bonding a pair of plates together with an intermediate layer, but the number of plates is arbitrary. Alternatively, at least one plate can be bonded together with an intermediate layer or directly.

[0138] Furthermore, when the glass panel is installed in a vehicle, its application areas include, for example, the front side windows, rear side windows, windshields, rear windows, and sunroofs of automobiles. In addition to automobiles, it can also be used in railway vehicles, and beyond vehicles, it can be used in diaphragms for loudspeakers, microphones, headphones, mobile devices, aircraft windows, ship windows, windows in residential buildings (building opening components), and glass substrates for magnetic recording media.

[0139] As stated above, the following matters are disclosed in this specification.

[0140] (1) A glass plate assembly comprising a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate.

[0141] The first and second plates mentioned above are plates with curved surfaces, each having a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface.

[0142] The concave main surface of the first plate and the convex main surface of the second plate are opposite to each other and overlap.

[0143] The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate.

[0144] According to this glass plate structure, the concave main surface of the first plate with a small radius of curvature coincides with the convex main surface of the second plate with a large radius of curvature, thereby enabling precise assembly of the first and second plates and reducing the gap at the outer edges. Therefore, the intermediate layer can be stably clamped between the first and second plates.

[0145] (2) The glass plate structure according to (1), wherein the thickness-direction spacing between the first plate and the second plate increases from the outer edge of the first plate and the second plate towards the center.

[0146] According to the glass plate structure, the thickness-direction spacing between the first plate and the second plate is minimized at the outer edge, making it easy to seal the intermediate layer.

[0147] (3) The glass plate body according to (1) or (2), wherein the intermediate layer is a solid phase.

[0148] According to the glass plate structure, the intermediate layer disposed between the first plate and the second plate is stably clamped.

[0149] (4) The glass plate structure according to (1) or (2), wherein the intermediate layer comprises a liquid layer.

[0150] Based on the composition of this glass plate, it is easy to achieve good acoustic properties.

[0151] (5) The glass plate structure according to (4), wherein at least one of the first plate and the liquid layer and the second plate and the liquid layer has a solid layer.

[0152] Based on the composition of this glass plate, the glass plate is not easily scattered when it breaks.

[0153] (6) The glass plate structure according to (5), wherein the solid layer is thinner than the thickness of the glass plate.

[0154] Based on the composition of this glass plate, it is easy to maintain transparency in the visible light region.

[0155] (7) The glass plate structure according to (5) or (6), wherein the solid layer comprises a resin material.

[0156] Based on the composition of this glass plate, the glass plate is not easily scattered when it breaks.

[0157] (8) A glass plate assembly according to any one of (4) to (7), wherein a sealing portion for joining the first plate and the second plate is provided at the outer edges of the first plate and the second plate.

[0158] The liquid layer is sealed in the inner space surrounded by the sealing part.

[0159] According to the glass plate structure, by sealing the liquid layer with a sealing part, air can be prevented from entering the liquid layer.

[0160] (9) The glass plate structure according to (8) wherein the viscosity coefficient of the sealant provided in the sealing part is higher than the viscosity coefficient of the liquid layer.

[0161] Based on this glass plate structure, air bubbles can be effectively removed from the liquid layer.

[0162] (10) The glass plate assembly according to (8) or (9), wherein the viscosity coefficient of the sealing portion is 1×10⁻⁶. － 1 For Pa·s and above, the viscosity coefficient of the aforementioned liquid layer is 1×10⁻⁶. 3 Below s.

[0163] According to the glass plate composition, when the plates are bonded together, a strength sufficient to withstand the weight of the plates can be obtained.

[0164] (11) A glass plate structure according to any one of (4) to (10), wherein the liquid layer is a liquid containing organosilicon.

[0165] According to the glass plate composition, by including organosilicon, the liquid layer can easily dissolve air and suppress the formation of bubbles.

[0166] (12) A glass plate structure according to any one of (1) to (11), wherein the first plate and the second plate have the same shape when viewed from above.

[0167] According to the glass plate structure, the outer edges of the first plate and the second plate overlap, which can reduce the gap between the plates.

[0168] (13) A glass plate assembly according to any one of (1) to (12), wherein the gap between the outer edges of the first plate and the second plate is 0.5 mm or less throughout the entire circumference.

[0169] Based on the glass plate structure, air can be reliably prevented from entering the intermediate layer.

[0170] (14) A glass plate assembly according to any one of (1) to (13), wherein the first plate and the second plate are both glass plates.

[0171] Based on the composition of this glass plate, vibration characteristics can be further improved.

[0172] (15) A glass plate assembly according to any one of (1) to (14), wherein the loss coefficient of the first plate and the second plate at 25°C is 1×10⁻⁶. －4 ~5×10 －3 .

[0173] Based on the glass plate structure, resonant vibration attenuation can achieve good vibration transmission characteristics.

[0174] (16) A method for manufacturing a glass plate component, the glass plate component comprising a first plate and a second plate disposed overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate.

[0175] The first and second plates mentioned above are both plates with curved surfaces. Each curved surface has a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate.

[0176] The manufacturing method includes:

[0177] An intermediate layer of liquid agent and sealant is provided on at least a portion of the concave main surface of the first plate.

[0178] A laminate is obtained by bonding the concave main surface of the second plate, which contains the intermediate layer liquid and sealant, to the convex main surface of the plate.

[0179] The above-mentioned laminated body was subjected to decompression.

[0180] According to the manufacturing method of this glass plate assembly, by bonding the concave main surface of the first plate with a small radius of curvature and the convex main surface of the second plate with a large radius of curvature through an interlayer using a liquid agent and a sealant, the first and second plates can be precisely combined, and the gap at the outer edges is reduced. Therefore, the interlayer can be stably clamped between the first and second plates.

[0181] (17) The method for manufacturing a glass plate assembly according to (16) wherein at least one of the first plate and the intermediate layer liquid agent and the second plate and the intermediate layer liquid agent is provided with a solid layer.

[0182] According to the manufacturing method of the glass plate component, in the manufactured glass plate component, the glass plate is not easy to scatter when the glass plate breaks.

[0183] (18) The method for manufacturing a glass plate assembly according to (16) or (17), wherein the laminate is pressurized after being subjected to depressurization.

[0184] According to the manufacturing method of this glass plate structure, air can be reliably prevented from entering the intermediate layer.

[0185] (19) A method for manufacturing a glass plate component according to any one of (16) to (18), wherein the sealant is cured after it is applied.

[0186] According to the manufacturing method of the glass plate, when the intermediate layer contains a liquid layer, liquid leakage can be reliably prevented.

[0187] (20) A method for manufacturing a glass plate structure according to any one of (16) to (19), wherein, after the above-mentioned sealant is applied, the above-mentioned intermediate layer is cured with a liquid agent.

[0188] According to the manufacturing method of the glass plate assembly, the intermediate layer disposed between the first plate and the second plate is stably clamped.

[0189] It should be noted that this application is based on Japanese patent application (Japanese Patent Application No. 2021-085411) filed on May 20, 2021, the contents of which are incorporated herein by reference.

[0190] Symbol Explanation

[0191] 11 First Board

[0192] 11a Convex principal surface

[0193] 11b Concave principal face

[0194] 13 Second board material

[0195] 13a Convex main surface

[0196] 13b Concave principal face

[0197] 15. Intermediate layer (liquid layer)

[0198] 17. Outer edge

[0199] 19 Sealing section

[0200] 21. Liquid agent for intermediate layer

[0201] 23. Sealant

[0202] 31 First solid layer

[0203] 33 Second solid layer

[0204] 100 and 101 glass plates constitute the structure

Claims

1. A glass plate assembly comprising a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate. The first and second plates are both plates with curved surfaces, wherein the curved surface has a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The concave main surface of the first plate and the convex main surface of the second plate are opposite to each other and coincide. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate. The intermediate layer contains a liquid layer. A sealing portion is provided in the gap between the outer edges of the first plate and the second plate to join the first plate and the second plate together. The liquid layer is sealed in an inner space surrounded by the sealing portion.

2. The glass plate structure according to claim 1, wherein, The thickness-direction spacing between the first plate and the second plate increases from the outer edges of the first plate and the second plate towards the center.

3. The glass plate structure according to claim 1 or 2, wherein, At least one of the first plate and the liquid layer and the second plate and the liquid layer has a solid layer.

4. The glass plate structure according to claim 3, wherein, The solid layer is thinner than the glass plate.

5. The glass plate structure according to claim 3, wherein, The solid layer comprises a resin material.

6. The glass plate structure according to claim 1 or 2, wherein, The viscosity coefficient of the sealant applied to the sealing portion at 25°C is higher than that of the liquid layer at 25°C.

7. The glass plate structure according to claim 1 or 2, wherein, The viscosity coefficient of the sealing part at 25°C is 1×10⁻⁶. －1 Pa•s or higher, the viscosity coefficient of the liquid layer at 25°C is 1×10⁻⁶. 3 Below Pa•s.

8. The glass plate structure according to claim 1 or 2, wherein, The liquid layer is a liquid containing organosilicon.

9. The glass plate structure according to claim 1 or 2, wherein, The first plate and the second plate have the same shape when viewed from above.

10. The glass plate structure according to claim 1 or 2, wherein, The gap between the outer edges of the first and second plates is less than 0.5 mm throughout the entire circumference.

11. The glass plate structure according to claim 1 or 2, wherein, Both the first and second plates are glass plates.

12. The glass plate structure according to claim 1 or 2, wherein, The loss coefficients of the first and second plates at 25°C are 1×10⁻⁶. －4 ~5×10 －3 .

13. The glass plate assembly according to claim 1 or 2, used in a vehicle.

14. A method for manufacturing a glass plate composition, the glass plate composition comprising a first plate and a second plate arranged overlapping each other in the thickness direction, and an intermediate layer disposed between the first plate and the second plate, wherein at least one of the first plate and the second plate is a glass plate. The first and second plates are both plates with curved surfaces. The curved surfaces have a convex main surface protruding in the thickness direction and a concave main surface opposite to the convex main surface. The radius of curvature of the concave main surface of the first plate is smaller than the radius of curvature of the convex main surface of the second plate. The intermediate layer contains a liquid layer. A sealing portion is provided in the gap between the outer edges of the first plate and the second plate to join the first plate and the second plate together. The liquid layer is sealed within the inner space surrounded by the sealing portion. The manufacturing method includes: An intermediate layer of liquid agent and sealant is provided on at least a portion of the concave main surface of the first plate. A laminate is obtained by bonding the concave main surface of the second plate, on which the intermediate layer of liquid agent and sealant are disposed, to the convex main surface of the second plate. The laminate is subjected to reduced pressure.

15. The method for manufacturing a glass plate component according to claim 14, wherein, At least one of the first plate and the intermediate layer liquid agent and the second plate and the intermediate layer liquid agent has a solid layer.

16. The method for manufacturing a glass plate composition according to claim 14 or 15, wherein, The laminate is pressurized after being subjected to depressurization.

17. The method for manufacturing a glass plate component according to claim 14 or 15, wherein, After applying the sealant, allow it to cure.

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