Laminated glass for vehicle roof

Abstract

A laminated glass (10) for a vehicle roof, which is used for at least a part of a vehicle roof (2), is provided with: a light control layer (14) that can adjust the light transmittance of light by applying a voltage; an intermediate layer (13) that has insulating properties and is disposed so as to sandwich the light modulation layer (14); a vehicle outer side glass plate (12) and a vehicle inner side glass plate (11), which are a pair of glass plates (11, 12) disposed so as to sandwich the intermediate layer (13); the laminated glass (10) for the vehicle roof is further provided with a color tone integration layer (M) which is disposed on the vehicle inner side of the light control layer (14) and which is capable of achieving color tone integration with another glass plate (4a) provided on the surface of the vehicle connected to the roof (2).

Description

Technical Field

[0001] This invention relates to laminated glass for vehicle roofs. Background Technology

[0002] A known type of dimming laminated glass for automobile and railway windows incorporates a dimming element whose light transmittance can be electrically altered within an interlayer. The dimming element comprises a dimming layer and a pair of conductive layers sandwiching the dimming layer. To enhance passenger privacy, this type of dimming laminated glass, for example, scatters light when the dimming layer is off, exhibiting a frosted glass appearance, and becomes transparent when the dimming element is on. For example, a liquid crystal element can be used as the dimming layer (see, for example, Patent Document 1). Prior technology documents Patent documents

[0003] Patent Document 1: International Publication No. 2022 / 153998 Summary of the Invention The problem that the invention aims to solve

[0004] Laminated glass with dimming capabilities is used, for example, in vehicle roofs. Furthermore, privacy glass, sometimes tinted gray, is sometimes used in areas such as the rear and side windows adjacent to the roof. Using privacy glass in these areas protects the privacy of rear-seat occupants from the outside. In this case, regulations require the windshield to have a visible light transmittance of at least 70%. Therefore, there is a significant difference in visible light transmittance between the front and rear of the vehicle's interior, which can easily lead to color disharmony. To address this, and to achieve a unified color scheme within the vehicle's interior, the dimming function of the laminated glass used in the roof can be considered. However, even if the dimming layer of the roof glass is adjusted to the same hue as the rear glass, a color difference will still exist, making it difficult to ensure a unified color scheme within the vehicle's interior.

[0005] Therefore, there is an urgent need for a laminated glass for vehicle roofs that can achieve color integration with other glass located adjacent to the roof. Methods for solving problems

[0006] The laminated glass for vehicle roofs according to the present invention is characterized in that the glass is a laminated glass for at least a portion of the roof of a vehicle, comprising: a light-adjusting layer, the light transmittance of which can be adjusted by applying voltage; an insulating intermediate layer disposed in a manner that sandwiches the light-adjusting layer; an outer side glass panel and an inner side glass panel, which are a pair of glass panels disposed in a manner that sandwiches the intermediate layer; the laminated glass for vehicle roofs also has a color-integrating layer disposed on the inner side of the light-adjusting layer, and capable of color integration with other glass panels disposed on the vehicle's facade connected to the roof.

[0007] According to this structure, the laminated glass for the vehicle roof has a color-integrating layer disposed on the inner side of the light-adjusting layer, and can achieve color-integration with other glass panels on the vehicle's facade connected to the roof. Therefore, even if other glass panels on the vehicle's facade connected to the roof are tinted glass panels, color-integration with these other glass panels can be achieved through the color-integrating layer of the laminated glass for the vehicle roof. As a result, a sense of color uniformity in the vehicle's interior space can be easily and appropriately ensured.

[0008] Another structural feature is that the color integration layer is composed of the interior glass panel of the vehicle.

[0009] The dimming laminated glass used in vehicles comprises: a dimming layer that adjusts light transmittance by applying voltage; an insulating layer sandwiching the dimming layer; and an exterior glass panel and an interior glass panel, which are a pair of glass panels sandwiching the intermediate layer. Therefore, in this structure, if the color-integrating layer is composed of the interior glass panel, the laminated glass for the vehicle roof can be constructed without adding a new component as the color-integrating layer, reducing manufacturing costs and processes. Furthermore, if the interior glass panel, as the color-integrating layer, is the same glass panel as other glass panels on the vehicle's facade connected to the roof, color integration with other glass panels is easily achieved, thereby ensuring a unified color scheme for the vehicle's interior space.

[0010] Another structural feature is that it also has an optical adjustment layer to adjust optical performance.

[0011] Laminated roof glass with a dimming layer is susceptible to the influence of external light from the pair of glass panes on the vehicle's interior space, as well as reflections within the interior space, because it comprises a pair of glass panes. Therefore, in this structure, the laminated roof glass also includes an optical adjustment layer to adjust its optical performance. Thus, the laminated roof glass can appropriately adjust the impact of the pair of glass panes on the vehicle's interior space through the optical adjustment layer.

[0012] Another structural feature is that the optical adjustment layer is configured to adjust at least one of visible light transmittance, brightness, and luminance.

[0013] As in this structure, if the optical adjustment layer is configured to adjust at least one of visible light transmittance, brightness, and luminance, then the laminated glass for the vehicle roof can utilize the optical adjustment layer to appropriately adjust the impact of external light on the interior space of the vehicle after passing through a pair of glass panels.

[0014] Another structural feature is that the optical adjustment layer is disposed on the outer side of the tone integration layer.

[0015] In this structure, if the optical adjustment layer is positioned on the exterior side of the tone integration layer, the optical adjustment layer can function before the tone integration layer for external light; and the tone integration layer can function more effectively than the optical adjustment layer for the vehicle's interior space. Therefore, laminated glass for the vehicle roof can more easily ensure a unified tone for the vehicle's interior space through the tone integration layer and the optical adjustment layer.

[0016] Another structural feature is that the intermediate layer comprises: a supporting substrate disposed on both sides of the dimming layer and supporting the dimming layer; an adhesive layer disposed between the supporting substrate and a pair of glass plates, bonding the supporting substrate to the glass plates; the optical adjustment layer is composed of at least one of the dimming layer, the supporting substrate, the adhesive layer and the exterior glass plate of the vehicle.

[0017] As in this structure, if the optical adjustment layer is composed of existing components in the laminated glass for vehicle roofs, then the laminated glass for vehicle roofs can be constructed without adding new components as the optical adjustment layer, which can reduce manufacturing costs and processes.

[0018] Another structural feature is that the optical adjustment layer includes at least one of a Low-E film and a reflection prevention layer.

[0019] As in this structure, if the optical adjustment layer includes at least one of a Low-E film and a reflection prevention layer, the laminated glass for the vehicle roof can improve the heat shielding or heat insulation effect through the Low-E film, and the reflection prevention layer can easily prevent reflections in the vehicle's interior space.

[0020] Another structural feature is that each of the pair of glass plates has an area of ​​800mm × 600mm or more.

[0021] As in this structure, if each of the pair of glass panels has an area of ​​800mm × 600mm or more, it can ensure a larger area of ​​laminated glass for the vehicle roof, thereby making it easier to achieve a sense of color unity in the vehicle's interior space.

[0022] Another characteristic structure is that, in CIE L a b In the chromaticity coordinate diagram, the chromaticity difference between the hue integration layer and the other glass plates is in a... Dimensions are 5 or less, in b The dimensions are 5 or less.

[0023] As in this structure, in CIE L a b In the chromaticity coordinate diagram, if the chromaticity difference between the tone integration layer and other glass panels on the vehicle's facade connected to the roof is within the range of a... Dimensions are 5 or less, in b If the dimensions are within 5, a sense of unity can be appropriately achieved in the vehicle's interior space, which is composed of laminated glass and other glass panels on the vehicle roof.

[0024] Another characteristic structure is that, in CIE L a b In the chromaticity coordinate diagram, the 'a' of the hue integration layer... For values ​​between -10.0 and 6.5, b It is between -3.5 and 6.5.

[0025] For example, in vehicles, privacy glass is sometimes installed in the rear section of the vehicle, where it connects to the roof and faces the rear. Privacy glass, for example, has a visible light transmittance of less than 70%, excellent light-blocking properties, and is often configured with adjustable tint. This type of privacy glass is classified under CIE L (Civil Engineering Law). a b In the chromaticity represented by the chromaticity coordinate diagram, a b is greater than -5 and less than 0. The values ​​are mostly between 0 and 5. Therefore, if the glass conforms to this structural chromaticity, the laminated glass used in the vehicle roof can create a unified look with the privacy glass.

[0026] Another structural feature is that the tone integration layer is composed of a pair of glass plates, and when the dimming layer is in a transparent state that transmits visible light, it is in CIE L a b In the chromaticity coordinate diagram, the chromaticity difference between the hue integration layer and the other glass plates is in a... Dimensions are 5 or less, in b The dimensions are 5 or less.

[0027] In this structure, the tone integration layer consists of a pair of glass plates, and when the dimming layer is in a transparent state that transmits visible light, in CIE L... a b In the chromaticity coordinate diagram, if the chromaticity difference between the tone integration layer and other glass panels on the vehicle's facade connected to the roof is within the range of a... Dimensions are 5 or less, in b If the dimensions are within 5, a sense of unity can be appropriately achieved in the vehicle's interior space, which is composed of laminated glass and other glass panels on the vehicle roof.

[0028] Another characteristic structure is that, in CIE L a b In the chromaticity coordinate diagram, the 'a' of the hue integration layer... For values ​​between -10.0 and 6.5, b It is between -3.5 and 6.5.

[0029] As mentioned above, privacy glass in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a b is greater than -5 and less than 0. The values ​​are mostly between 0 and 5. Therefore, if the glass conforms to this structural chromaticity, the laminated glass used in the vehicle roof can create a unified look with the privacy glass.

[0030] Another characteristic structure is that the color integration layer is made of soda-lime glass, in which the total amount of Fe2O3 is less than 1.2 wt% and TiO2 is less than 0.5 wt%.

[0031] If the color integration layer is made of soda-lime glass and contains a large amount of Fe2O3 or TiO2, then in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the negative side and thus exhibit a greenish hue, b It will increase towards the positive side and exhibit a yellow hue. On the other hand, as in this structure, if the color integration layer is composed of soda-lime glass with a total Fe2O3 content of 1.2 wt% or less and TiO2 content of 0.5 wt%, then a and b The value will decrease, and the hue of the hue integration layer will be suppressed. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through the hue integration layer within the vehicle space. Furthermore, the so-called total Fe2O3 content takes into account the simultaneous presence of FeO and Fe2O3 as iron oxide in soda-lime glass, assuming that all FeO and Fe2O3 exist in the form of Fe2O3 as the total iron oxide content.

[0032] Another structural feature is that the color integration layer is further composed of soda-lime glass with Co3O4 content below 100 ppm and Se content below 5 ppm.

[0033] If the color integration layer is made of soda-lime glass and contains a large amount of Co3O4, then in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, b It will increase towards the negative side, thus exhibiting a greenish hue. Furthermore, if the tone integration layer is composed of soda-lime glass and contains a large amount of Se, then in CIE L... a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the positive side and appear reddish, b It will increase towards the positive side, exhibiting a yellow hue. On the other hand, as in this structure, if the Co3O4 content in the color integration layer is below 100 ppm and the Se content is below 5 ppm, it can suppress the increase caused by a and b This causes a change in the tone of the tone integration layer. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through the tone integration layer within the vehicle space.

[0034] Another structural feature is that the color integration layer is composed of soda-lime glass with a total Fe2O3 content of 1.0 wt% to 4.0 wt% and a total TiO2 content of 500 ppm or less, a Co3O4 content of 15 ppm to 40 ppm and a Se content of 15 ppm to 40 ppm.

[0035] If the color integration layer is made of soda-lime glass and contains a large amount of Fe2O3 or TiO2, then in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the negative side and thus exhibit a greenish hue, b It will increase towards the positive side, exhibiting a yellowish hue. Furthermore, if the color integration layer is composed of soda-lime glass and contains a large amount of Co3O4, then in CIE L... a b In the chromaticity represented by the chromaticity coordinate diagram, b It will increase towards the negative side, resulting in a greenish hue. Additionally, if the tone integration layer is made of soda-lime glass and contains a large amount of Se, then in CIE L... a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the positive side and appear reddish, b It will increase towards the positive side and thus exhibit a yellowish hue.

[0036] Therefore, as in this structure, even if the total amount of Fe2O3 and the total amount of TiO2 in the color-integrating layer are 1.0wt% to 4.0wt%, if the color-integrating layer is composed of soda-lime glass with Co3O4 of 500ppm or less and Se of 15ppm to 40ppm or less, then in the color-integrating layer, a The tendency for the total amount of Fe2O3 to increase negatively due to the sum of TiO2 and Fe2O3 can be reversed positively through Se. Furthermore, in the tone integration layer, b The tendency for the total amount of Fe2O3 to increase positively due to the sum of TiO2 will be reversed negatively through Co3O4. That is, a and b It does not exhibit large values ​​in a single direction, whether positive or negative, so laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through a color integration layer in the vehicle space.

[0037] Another characteristic structure is: Based on the total amount of Fe2O3 and the contents of TiO2, Co3O4, and Se in the hue integration layer, the CIE L a b The chromaticity coordinates represented by the chromaticity coordinates are related to a. The coloring component functions Fa and b are correlated. The coloring component function Fb with correlation is defined as follows: Fa = -3.5 × [total Fe₂O₃ (wt%)] - 1.5 × [TiO₂ (wt%)] + 0.20 × [Se (ppm)], and Fb = [Total Fe2O3 (wt%)] + 4 × [TiO2 (wt%)] - 43 × 10 -4 ×[Co3O4 (ppm)] + 0.4 × 10 -4 ×[Se (ppm)]; The color integration layer is made of soda-lime glass that satisfies -9≤Fa≤1 and -5≤Fb≤10.

[0038] In CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a This indicates that increasing the value towards the positive side results in a reddish hue, while increasing it towards the negative side results in a greenish hue. Additionally, b... This indicates that increasing the value towards the positive side results in a yellowish hue, while increasing it towards the negative side results in a bluish hue. If the hue integration layer is composed of soda-lime glass and contains a large amount of Fe2O3 or TiO2, then a It will increase towards the negative side and thus exhibit a greenish hue, b It will increase towards the positive side, thus exhibiting a yellowish hue. Therefore, in CIE L... a b In the chromaticity coordinate diagram, the chromaticity is represented by a... The coloring component functions Fa and b are correlated. The component coefficients of the correlated coloring component function Fb are defined as described above, such that the two functions are correlated with a and b respectively. Proportional. Therefore, as in this structure, if the color integration layer is made of soda-lime glass and Fa and Fb satisfy the above ranges, then in CIEL... a b In the chromaticity coordinate diagram, the chromaticity can be represented by a. and b It is controlled within the prescribed range. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through a color-integrating layer within the vehicle space. Attached Figure Description

[0039] Figure 1 This diagram illustrates laminated glass used for the roof of a vehicle. Figure 2 This is a partial cross-sectional view of the laminated glass used in the roof of a vehicle. Figure 3 This is a partial cross-sectional view of the laminated glass for the vehicle roof according to the second embodiment. Figure 4 This is a partial cross-sectional view of a variation of the second embodiment, Example 1. Figure 5 This is a partial cross-sectional view of a variation of the second embodiment. Figure 6 To illustrate the single-layer glass plate in the embodiment, in CIE L a b A graph representing chromaticity in a chromaticity coordinate diagram. Figure 7 To illustrate the laminated glass in the embodiment, in CIE L a b A graph representing chromaticity in a chromaticity coordinate diagram. Detailed Implementation

[0040] Hereinafter, embodiments of the laminated glass for vehicle roofs according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from its spirit.

[0041] like Figure 1 As shown, a laminated glass 10 (hereinafter referred to as "laminated glass 10") is disposed on a portion of the roof 2 of the vehicle 1. The vehicle 1 has a front 3, a rear 4, and left and right side panels 5, 5, which are connected to the roof 2. A windshield 3a is provided on the front 3, a rear glass 4a is provided on the rear 4, and multiple side windows 5a are provided on the side panels 5, 5. In the following figures, for example, Figure 1 As shown, the vehicle's direction of travel (front-to-back direction) is defined as the X direction, the front side of the vehicle's direction of travel is defined as the X1 side, and the rear side of the vehicle's direction of travel is defined as the X2 side. Between the end of the laminated glass 10 on the X2 side and the end of the rear glass 4a on the X1 side, there is a rear edge portion 2a of the roof.

[0042] [First Embodiment] like Figure 2 As shown, the laminated glass 10 includes a pair of glass plates 11 and 12, an intermediate layer 13, a dimming layer 14, and a pair of conductive layers 15 and 15. The intermediate layer 13 is, for example, composed of a first intermediate layer 31 (an example of an adhesive layer) bonded to the pair of glass plates 11 and 12, and a second intermediate layer 32 (an example of a supporting substrate) disposed between the first intermediate layer 31 and the dimming layer 14. The dimming unit 20 includes the dimming layer 14, the pair of conductive layers 15 and 15, and the second intermediate layer 32. The dimming unit 20 includes an element capable of switching the light transmittance of the laminated glass 10.

[0043] The dimming unit 20 can switch between a low transmittance state and a high transmittance state, for example. The transmittance can be switched in multiple stages or continuously. The dimming unit 20 can be disposed on approximately the entire laminated glass 10, or only on a portion thereof, as needed. The planar shape of the dimming unit 20 is, for example, a rectangle smaller than the planar shape of the laminated glass 10.

[0044] The dimming section 20 is surrounded by a first intermediate layer 31. In the dimming section 20, a second intermediate layer 32 supports a pair of conductive layers 15, 15. Furthermore, the first intermediate layer 31 is a buffer film with a Young's modulus smaller than that of the second intermediate layer 32. Both the first intermediate layer 31 and the second intermediate layer 32 are formed of resin, and a pair of glass plates 11, 12 are bonded to the dimming section 20 via the first intermediate layer 31.

[0045] For example, the light transmittance of the dimming layer 14 is less than 30% when no voltage is applied, and more than 30% when a voltage is applied. It is more preferable that the light transmittance of the dimming layer 14 is less than 20% when no voltage is applied, and more than 40% when a voltage is applied.

[0046] The dimming layer 14 may have a haze of 10% or more when no voltage is applied, and a haze of less than 10% when voltage is applied. It is more preferable that the dimming layer 14 has a haze of 20% or more when no voltage is applied, and a haze of 8% or less when voltage is applied. The dimming layer 14 may also be formed with a surface area smaller than that of the intermediate layer 13 (the first intermediate layer 31 and the second intermediate layer 32).

[0047] For example, a dimming layer 14 formed of liquid crystal or the like can be configured as a dimming film comprising a pair of conductive layers 15, 15 disposed on both sides of the dimming layer 14. The dimming layer 14, for example, controls the haze of the film according to whether electricity is applied, forming a transparent state and an opaque state. That is, the light transmittance of the dimming layer 14 can be adjusted by applying a voltage. As the dimming layer 14, known types such as PDLC (Polymer Dispersed Liquid Crystal), SPD (Suspended Particle Device), electrochromic, and thermochromic layers can be used.

[0048] A pair of conductive layers 15, 15 are configured to sandwich a dimming layer 14, and a voltage is applied to the dimming layer 14 by supplying power. An intermediate layer 13 (a first intermediate layer 31 and a second intermediate layer 32) is configured to sandwich a pair of conductive layers 15, 15, and has insulating properties.

[0049] The dimming layer 14 is opaque when no voltage is applied, and becomes transparent when voltage is applied via a pair of conductive layers 15, 15. Alternatively, the dimming layer 14 may be configured to be transparent when no voltage is applied and opaque when voltage is applied.

[0050] The dimming layer 14 is configured, for example, to apply a voltage of 30V or more when the haze value is reduced to below 10%. With this configuration, the dimming layer 14 in the laminated glass 10 can effectively improve transparency and properly perform the dimming function.

[0051] It is preferable that the film thickness of the dimming layer 14 is 20 μm or more and 150 μm or less. If the film thickness of the dimming layer 14 is 20 μm or more and 150 μm or less, the laminated glass 10 can achieve a lightweight dimming layer 14 while ensuring appropriate dimming function in the dimming layer 14.

[0052] In this embodiment, in the laminated glass 10, the first glass plate 11 (an example of an interior glass plate) of a pair of glass plates 11 and 12 is disposed on the interior side of the vehicle, and the second glass plate 12 (an example of an exterior glass plate) is disposed on the exterior side of the vehicle. The pair of glass plates 11 and 12 are disposed with an intermediate layer 13 sandwiched between them. Specifically, the pair of glass plates 11 and 12 face each other, and the intermediate layer 13, the dimming layer 14, and a pair of conductive layers 15 are located between the pair of glass plates 11 and 12. The pair of glass plates 11 and 12 are fixed in a state of sandwiching the intermediate layer 13, the dimming layer 14, etc.

[0053] The first glass plate 11 and the second glass plate 12 can be made of known glass plates, and can be formed from ordinary soda-lime glass. An example of the composition of soda-lime glass is shown below.

[0054] (Sodium-calcium glass) SiO2: 70-73% by mass Al2O3: 0.6–2.4% by mass CaO: 7–12% by mass MgO: 1.0–4.5% by mass R2O: 13-15% by mass (R is an alkali metal) Total iron oxide (T-Fe2O3) converted to Fe2O3: 0.08–0.14% by mass

[0055] The laminated glass 10 has a tone-integrating layer M disposed on the interior side of the light-switching layer 14. In the laminated glass 10, the tone-integrating layer M... Figure 1 In the vehicle 1 shown, color integration is achieved between the rear glass 4a (an example of other glass panels) located on the rear side 4 (rear portion) connected to the roof 2. In this embodiment, the color integration layer M is composed of a first glass panel 11 (inner side glass panel). The term "rear glass 4a connected to the roof 2" refers to a form in which the glass panels (laminated glass 10 and rear glass 4a) are identified as an integral and inseparable unit via the rear edge 2a of the roof, meaning that when viewed from inside the vehicle, the laminated glass 10 and rear glass 4a are visually recognized as adjacent.

[0056] Each of the pair of glass panels 11 and 12 has an area of ​​800mm × 600mm or more. In the laminated glass 10, if each of the pair of glass panels 11 and 12 has an area of ​​800mm × 600mm or more, a larger area of ​​laminated glass 10 can be ensured for the roof 2 of the vehicle 1, thereby making it easier to achieve a sense of color unity in the interior space of the vehicle.

[0057] When only the first glass plate 11 is used as the tone integration layer M, according to the CIE L standard of JIS Z8781-4 (2013) a b In the chromaticity coordinate diagram, the chromaticity difference between the chromaticity integration layer M and the rear glass 4a, calculated from observations from the indoor side, is represented by the chromaticity difference in a. Dimensions are 5 or less, in b The dimension is within 5. This setup allows for a suitable sense of unity within the vehicle's interior space, comprised of the laminated glass 10 and the rear glass 4a (other glass panels). The tonal difference between the tone integration layer M and the rear glass 4a is within the CIE L... a b a in the chromaticity coordinate diagram Dimensions are 3 or less and in b A dimension of 3 or less is preferred.

[0058] Alternatively, the tone integration layer M can also be composed of a pair of glass plates 11 and 12. In this case, when the tone integration layer M (the pair of glass plates 11 and 12) is in a light-transmitting state where the dimming layer 14 transmits visible light, according to JIS Z8781-4 (2013) CIEL... a b In the chromaticity coordinate diagram, the chromaticity difference between the chromaticity integration layer M and the rear glass 4a, calculated from observations from the indoor side, is represented by the chromaticity difference in a. Dimensions are 5 or less, in b The dimension is within 5. This setup allows for a suitable sense of unity within the vehicle's interior space, comprised of the laminated glass 10 and the rear glass 4a (the other glass panels). The tonal difference between the tone integration layer M (a pair of glass panels 11, 12) and the rear glass 4a is within the CIE L... a b a in the chromaticity coordinate diagram Dimensions are 3 or less and in b A dimension of 3 or less is preferred.

[0059] Here, privacy glass, such as rear window 4a, designed to make rear-seat passengers difficult to see from the outside, is configured to, for example, have a visible light transmittance of less than 70%, excellent light-blocking properties, and adjustable tint. This type of privacy glass is used in CIEL. a b In the chromaticity represented by the chromaticity coordinate diagram, a b is greater than -5 and less than 0. The majority of cases have values ​​between 0 and 5. Therefore, when privacy glass is used in the rear glass 4a, regardless of whether the tone integration layer M is only the first glass panel 11 or a pair of glass panels 11 and 12, in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a For values ​​above -10.0 and below 6.5, b A chromaticity of -3.5 or higher and 6.5 or lower is preferred. By setting the chromaticity of the hue integration layer M to the above-mentioned chromaticity range, the laminated glass 10 can achieve a unified look with the privacy glass.

[0060] [Second Implementation] The laminated glass 10 with the dimming layer 14, because it includes a pair of glass plates 11 and 12, is susceptible to the influence of external light from the pair of glass plates 11 and 12 on the vehicle's interior space, as well as reflections from the interior space. Therefore, in the second embodiment, as... Figure 3 As shown, the laminated glass 10 also includes an optical adjustment layer 40 for adjusting optical performance. Other configurations are the same as in the first embodiment.

[0061] Thus, the laminated glass 10, by means of an optical adjustment layer 40 that adjusts optical properties, can appropriately adjust the impact of the pair of glass panels 11, 12 on the interior space of the vehicle. Here, the optical adjustment layer 40 is configured to adjust at least one of visible light transmittance, brightness, and luminance. Therefore, the laminated glass 10 can utilize the optical adjustment layer 40 to appropriately adjust the impact of external light passing through the pair of glass panels 11, 12 on the interior space of the vehicle.

[0062] Furthermore, in this embodiment, the optical adjustment layer 40 is disposed on the outer side of the tone integration layer M and includes a Low-E film 41. The Low-E film 41 is disposed between the second glass plate 12 and the intermediate layer 13. Here, the Low-E film 41 is composed of a metal film. To balance infrared reflectivity and visible light transmittance, the thickness of the Low-E film 41 (low-emissivity film) is preferably about 1 to 5000 nm, more preferably about 10 to 3000 nm. The Low-E film 41 is preferably a multilayer film formed by stacking two or more layers selected from metal layers, metal oxide layers, metal nitride layers, and metal oxynitride layers. A preferred example of a metal layer is a silver layer. A preferred example of a metal oxide layer is a tin oxide layer, a titanium oxide layer, or a zinc oxide layer. A preferred example of a metal nitride layer is silicon nitride. A preferred example of a metal oxynitride layer is silicon oxynitride. According to this structure, for external light, the optical adjustment layer 40 can function before the tone integration layer M; for the vehicle interior space, the tone integration layer M can function more easily than the optical adjustment layer 40. Therefore, the laminated glass 10 can more easily ensure the uniformity of the color tone of the vehicle interior space through the tone integration layer M and the optical adjustment layer 40. In addition, since the Low-E film 41 is disposed between the second glass plate 12 and the intermediate layer 13, the laminated glass 10 can exert a heat-shielding effect through the Low-E film 41.

[0063] [Modification 1 of the second embodiment] like Figure 4 As shown, in the laminated glass 10, the Low-E film 41 can also be disposed between the first glass plate 11 and the intermediate layer 13. According to this structure, in the laminated glass 10, the Low-E film 41, which serves as the optical adjustment layer 40, can provide heat insulation.

[0064] [Modification 2 of the second embodiment] like Figure 5 As shown, the laminated glass 10 can also be configured to include an anti-reflection layer 42, which serves as an optical adjustment layer 40 for adjusting optical performance. Here, the anti-reflection layer 42 is a thin film with a thickness of 60 nm to 120 nm, composed of silicon dioxide, titanium dioxide, etc. The anti-reflection layer 42 is formed of one or more materials and has one or more layers. The materials constituting the anti-reflection layer 42 are not limited to specific materials. The anti-reflection layer 42 can be, for example, a film formed by a sol-gel method with SiO2, SiO1.5, TiO2, TiO1.5 as the main components, or a film in which hollow microparticles or microparticles of low refractive index materials are dispersed in the main components. The thickness of the anti-reflection layer 42 in this manner is, for example, 80 nm to 800 nm, preferably 100 nm to 500 nm, and more preferably more than 100 nm and less than 150 nm.

[0065] exist Figure 5In the example shown, the anti-reflection layer 42 is disposed on both sides of the second glass panel 12. As in this embodiment, if the optical adjustment layer 40 is configured to include the anti-reflection layer 42, reflections in the vehicle interior space caused by the laminated glass 10 can be easily avoided. Although not shown, the anti-reflection layer 42 may also be disposed only on the inner side of the second glass panel 12.

[0066] [Modification 3 of the second embodiment] In the laminated glass 10, the optical adjustment layer 40 can also be made of... Figure 2 It is composed of at least one of the dimming layer 14, the second intermediate layer 32, the first intermediate layer 31 and the second glass plate 12 shown.

[0067] As in this modified example, if the optical adjustment layer 40 is composed of existing components of the laminated glass 10, the laminated glass 10 can be constructed without adding new components as the optical adjustment layer 40, which can reduce manufacturing costs and processes.

[0068] [Example] Below, for glass A, glass B, glass C1, C2, glass D, and glass E shown in Table 1, after converting the thickness to 2 mm, the thickness was measured based on CIE L. a b The chromaticity of the chromaticity coordinate diagram. Glass A is gray, Glass B is light green, Glass C1 and C2 are transparent, Glass D is dark green, and Glass E is dark yellow, each exhibiting a different color. Here, Glass A is an example of privacy glass installed on the side or rear of the rear seats of a vehicle.

[0069] Table 1

[0070] The metallic composition of each of glass A to glass E, based on CIE L a b The colorimetric measurement results of the colorimetric coordinate diagram are shown in Table 1 and... Figure 6 As shown. Here, the total amount of Fe2O3 refers to the total iron oxide content when FeO and Fe2O3 coexist as iron oxide in soda-lime glass, assuming that all FeO and Fe2O3 exist in the form of Fe2O3. According to Table 1 and... Figure 6 The hue difference between glass A and glasses C1, C2 and glass D, in a Dimensions are 5 or less, in b The dimension is also within 5. On the other hand, the hue difference between glass A and glass B is within a... Dimensions and b All dimensions are 5 or higher. Furthermore, the hue difference between glass A and glass E is in a... Dimensions are within 5, but in b The dimension is 5 or more. This indicates that in vehicle 1 ( Figure 1 In the case where glass A is used as other glass on the face connected to the roof 2, glass A, glass C1, C2 and glass D are suitable as a color integration layer M (first glass panel 11).

[0071] In addition, a of glass A, glass C1, C2 and glass D All values ​​are in the range of -10.0 to 6.5, b All values ​​are in the range of -3.5 to 6.5. On the other hand, glass B's a Values ​​less than -10.0, and outside the range of -10.0 to 6.5, are considered as b. Values ​​greater than 6.5 fall outside the range of -3.5 to 6.5. Furthermore, the a value of glass E... Values ​​in the range of -10.0 to 6.5, but b Values ​​greater than 6.5 are outside the range of -3.5 to 6.5. This also indicates that in a single-layer glass panel (first glass panel 11), glass A, glass C1, C2 and glass D are suitable as the tone integration layer M.

[0072] Since glass A is privacy glass, in addition to glass A, the color integration layer M is preferably glass with Co3O4 content of less than 100 ppm and Se content of less than 5 ppm, like glass C1, C2 and glass D.

[0073] Laminated glass Next, for the glasses A to E shown in Table 1 above, the thickness was converted to 2 mm, and the two glasses were used as a pair of glass plates 11 and 12 as laminated glass. The thickness was measured based on CIE L. a b The chromaticity of the chromaticity coordinate diagram. As laminated glass, five types were used: laminated glass F to laminated glass J, as shown in Table 2. Furthermore, regarding the interlayer, PVB film 7018 (manufactured by Sekisui Chemicals Co., Ltd.) was used as a universal interlayer for any of laminated glass F to laminated glass J. However, a colored interlayer can also be used as an alternative.

[0074] Table 2

[0075] Laminated glass F to laminated glass J are based on CIE L a b The colorimetric measurement results of the colorimetric coordinate diagram are shown in Table 2 and... Figure 7 As shown in Tables 1 and 2, the hue differences between glass A and laminated glass F through J are as follows. The hue differences (difference values) between glass A and laminated glass F, G, and H, within a... Dimensions are 5 or less, in b The dimension is also within 5. On the other hand, the color difference (difference value) between glass A and laminated glass I and laminated glass J is within a Dimensions and b All dimensions are 5 or higher. This indicates that in vehicle 1 ( Figure 1 In the case where glass A is used as another glass panel on the face connected to the roof 2, laminated glass F, laminated glass G and laminated glass H are suitable as a color integration layer M (a pair of glass panels 11, 12).

[0076] Furthermore, laminated glass F, laminated glass G, and laminated glass H are all: a For values ​​in the range of -10.0 to 6.5, b Values ​​are in the range of -3.5 to 6.5. On the other hand, glass I and glass J are: a For values ​​outside the range of -10.0 to 6.5, b Values ​​greater than 6.5, and outside the range of -3.5 to 6.5. This also indicates that in laminated glass (a pair of glass plates 11, 12), laminated glass F, laminated glass G, and laminated glass H are suitable as the tone-integrating layer M.

[0077] The color integration layer M can also be made of soda-lime glass determined by the coloring component functions Fa and Fb, instead of CIE L-based glass. a b Chromaticity a in the chromaticity coordinate diagram b .

[0078] CIE L a b The chromaticity coordinates represented by the chromaticity coordinates are related to a. The coloring component function with correlation is denoted as Fa. Based on the total amount of Fe2O3, TiO2 and Se in glass A to glass E, the coloring component function Fa is defined as: Fa = -3.5 × [Fe2O3 (wt%)] - 1.5 × [TiO2 (wt%)] + 0.20 × [Se (ppm)].

[0079] In addition, CIE L a b The chromaticity coordinates represented by the chromaticity coordinates are related to b. The coloring component function with correlation is denoted as Fb. Based on the total amount of Fe2O3 and the contents of TiO2, Co3O4, and Se in glasses A to E, the coloring component function Fb is defined as: Fb = [Fe2O3 (wt%)] + 4 × [TiO2 (wt%)] - 43 × 10 -4 ×[Co3O4 (ppm)] + 0.4 × 10 -4 ×[Se(ppm)].

[0080] When the coloring component functions Fa and Fb are defined as above, the hue integration layer M is preferably made of soda-lime glass that satisfies -9≤Fa≤1 and -5≤Fb≤10.

[0081] In the above embodiments, the coloring composition functions Fa and Fb of glass C1 are as follows: Fa=-3.5×(0.6)-1.5×(0.5)+0.20×(0)=-2.9 Fb=(0.6)+4×(0.5)-43×10 -4 ×(0)+0.4×[0]=2.6. Furthermore, the coloring composition functions Fa and Fb of glass D are as follows: Fa=-3.5×(0.1)-1.5×(0)+0.20×(0)=-0.4 Fb=(0.1)+4×(0)-43×10 -4 ×(0)+0.4×10 -4 ×(0)=0.1. Therefore, glass C1 and glass D satisfy -9≤Fa≤1 and -5≤Fb≤10. Similarly, glass C2 also satisfies the above formula.

[0082] On the other hand, in the above embodiments, the coloring composition functions Fa and Fb of glass B are as follows: Fa=-3.5×(2.9)-1.5×(1.6)+0.20×(0)=-12.6 Fb=(2.9)+4×(1.6)-43×10 -4 × (300) + 0.4 × 10 -4 ×(0)=8.0. Furthermore, the coloring composition functions Fa and Fb of glass E are as follows: Fa=-3.5×(1.6)-1.5×(2.7)+0.20×(30)=-3.7 Fb=(1.6)+4×(2.7)-43×10 -4 × (350) + 0.4 × 10 -4 × (30) = 10.9. Therefore, glass B and glass E do not satisfy -9≤Fa≤1 and -5≤Fb≤10.

[0083] In CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a This indicates that increasing the value towards the positive side results in a reddish hue, while increasing it towards the negative side results in a greenish hue. Additionally, b... This indicates that increasing the value towards the positive side results in a yellowish hue, while increasing it towards the negative side results in a bluish hue. If the hue integration layer M is composed of soda-lime glass and contains a large amount of Fe2O3 or TiO2, then a will increase towards the negative side, resulting in a greenish hue, and b... It will increase towards the positive side, thus exhibiting a yellowish hue. Therefore, in CIE L... a b In the chromaticity coordinate diagram, the chromaticity is represented by a... The coloring component functions Fa and b are correlated. The component coefficients of the correlated coloring component function Fb are defined as described above, enabling the two functions to correlate with a respectively. and b Proportional. Therefore, if the tone integration layer M is made of soda-lime glass and Fa and Fb satisfy the above ranges, then in CIE L a b In the chromaticity coordinate diagram, the chromaticity can be represented by a. and b The temperature is controlled within the prescribed range. Therefore, the laminated glass 10 can effectively achieve a sense of unity with the privacy glass through the color integration layer M in the vehicle space.

[0084] [Other Implementation Methods] (1) The second embodiment above shows an example of using a Low-E film 41 for the optical adjustment layer 40, and the third embodiment above shows an example of using a reflection prevention layer 42 for the optical adjustment layer 40. However, the optical adjustment layer 40 may also be composed of a combination of Low-E film 41 and reflection prevention layer 42.

[0085] (2) In the laminated glass 10, the color integration layer M (first glass plate 11 or a pair of glass plates 11, 12) may also be composed of soda-lime glass with Fe2O3 of less than 1.2wt% and TiO2 of less than 0.5wt%.

[0086] If the color integration layer M is made of soda-lime glass and contains a large amount of Fe2O3 or TiO2, then in CIE L a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the negative side and thus exhibit a greenish hue, b It will increase towards the positive side and exhibit a yellow hue. On the other hand, as in this embodiment, if the hue integration layer M is composed of soda-lime glass with Fe2O3 of 1.2 wt% or less and TiO2 of 0.5 wt%, then a and b The value will decrease, and the hue of the hue integration layer M will be suppressed. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through the hue integration layer M in the vehicle space.

[0087] (3) For the soda-lime glass described in (2), the hue integration layer M can also satisfy the following requirements: Co3O4 content below 100 ppm and Se content below 5 ppm. If the hue integration layer M is composed of soda-lime glass and contains a large amount of Co3O4, then in CIE L... a b In the chromaticity represented by the chromaticity coordinate diagram, b It will increase towards the negative side, exhibiting a greenish hue. Furthermore, if the tone integration layer M is composed of soda-lime glass and contains a large amount of Se, then in CIE L... a b In the chromaticity represented by the chromaticity coordinate diagram, a It will increase towards the positive side and appear reddish, b It will increase towards the positive side, exhibiting a yellow hue. On the other hand, as in this structure, if the Co3O4 content in the hue integration layer M is below 100 ppm and the Se content is below 5 ppm, it can suppress the influence of a... and b This causes a change in the hue of the hue integration layer M. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through the hue integration layer M within the vehicle space.

[0088] (4) In the laminated glass 10, the color integration layer M (first glass plate 11 or a pair of glass plates 11, 12) may also be composed of soda-lime glass with a total amount of Fe2O3 and TiO2 of 1.0wt% to 4.0wt%, Co3O4 of 500ppm or less, and Se of 15ppm to 40ppm or less.

[0089] As in this embodiment, even if the total amount of Fe2O3 and the total amount of TiO2 in the color integration layer M are 1.0 wt% to 4.0 wt%, if the color integration layer M is composed of soda-lime glass with Co3O4 of 500 ppm or less and Se of 15 ppm to 40 ppm or less, then in the color integration layer M, a The tendency for the total amount of Fe2O3 to increase negatively due to the sum of Fe2O3 and TiO2 is reversed positively through Se. Furthermore, in the color integration layer M, the tendency for b to increase positively due to the sum of Fe2O3 and TiO2 is reversed negatively through Co3O4. That is, a and b It does not exhibit large values ​​in a single direction, either positive or negative. Therefore, laminated glass for vehicles can effectively achieve a sense of unity with privacy glass through the color integration layer M in the vehicle space. In addition, the laminated glass 10 can also use glass A (privacy glass) as shown in Table 1 as the color integration layer M. Industrial utilization potential

[0090] This invention can be widely applied to laminated glass for vehicle roofs. Explanation of symbols

[0091] 1: Vehicle 2: Roof 4a: Rear glass (other glass panels) 10: Laminated glass (laminated glass for vehicle roofs) 11: First glass panel (inner side glass panel) 12: Second glass panel (exterior side glass panel) 13: Intermediate layer 14: Dimming Layer 15: Conductive layer 20: Dimming Department 31: First intermediate layer (adhesive layer) 32: Second intermediate layer (supporting substrate) 40: Optical Adjustment Layer 41: Low-E membrane 42: Anti-reflection layer M: Tone Integration Layer

Claims

1. A laminated glass for a vehicle roof, used for at least a portion of the roof of a vehicle, said laminated glass for a vehicle roof comprising: A dimming layer, wherein the light transmittance can be adjusted by applying a voltage; An intermediate layer, which is insulating, is configured to sandwich the dimming layer; as well as The exterior glass panel and the interior glass panel are a pair of glass panels configured with the intermediate layer sandwiched between them. The laminated glass for the vehicle roof has a color-integrating layer disposed on the inner side of the dimming layer and capable of color integration with other glass panels disposed on the front of the vehicle connected to the roof.

2. The laminated glass for vehicle roof according to claim 1, wherein the color integration layer is formed by the inner glass panel of the vehicle.

3. The laminated glass for vehicle roofs according to claim 1 or 2, wherein the laminated glass for vehicle roofs further comprises an optical adjustment layer for adjusting optical performance.

4. The laminated glass for vehicle roof according to claim 3, wherein the optical adjustment layer is configured to adjust at least one of visible light transmittance, brightness, and luminance.

5. The laminated glass for vehicle roof according to claim 3 or 4, wherein the optical adjustment layer is disposed on the outer side of the tone integration layer.

6. The laminated glass for vehicle roofs according to any one of claims 3 to 5, The intermediate layer includes: A supporting substrate is disposed on both sides of the dimming layer and supports the dimming layer; as well as An adhesive layer is disposed between the supporting substrate and the pair of glass plates, bonding the supporting substrate to the glass plates. The optical adjustment layer is composed of at least one of the dimming layer, the supporting substrate, the adhesive layer, and the exterior glass panel of the vehicle.

7. The laminated glass for vehicle roof according to any one of claims 3 to 6, wherein the optical adjustment layer is configured to include at least one of a Low-E film and a reflection-preventing layer.

8. The laminated glass for vehicle roof according to any one of claims 1 to 7, wherein each of the pair of glass panels has an area of ​​800 mm × 600 mm or more.

9. The laminated glass for vehicle roof according to any one of claims 1 to 8, wherein the color integration layer is composed solely of the interior glass panel, in CIE L a b In the chromaticity coordinate diagram, the chromaticity difference between the hue integration layer and the other glass plates is in a... Dimensions are 5 or less, in b The dimensions are 5 or less.

10. The laminated glass for vehicle roof according to claim 9, in CIE L a b In the chromaticity coordinate diagram, the 'a' of the hue integration layer... For values ​​above -10.0 and below 6.5, b It is above -3.5 and below 6.

5.

11. The laminated glass for vehicle roofs according to any one of claims 1 to 8, wherein the tone-integrating layer is composed of a pair of said glass plates, and when the light-adjusting layer is in a light-transmitting state that transmits visible light, in CIE L... a b In the chromaticity coordinate diagram, the chromaticity difference between the hue integration layer and the other glass plates is in a... Dimensions are 5 or less, in b The dimensions are 5 or less.

12. The laminated glass for vehicle roofs according to claim 11, in CIE L a b In the chromaticity coordinate diagram, the 'a' of the hue integration layer... For values ​​above -10.0 and below 6.5, b It is above -3.5 and below 6.

5.

13. The laminated glass for vehicle roof according to any one of claims 1 to 12, wherein the color integration layer is composed of soda-lime glass with a total Fe2O3 content of 1.2 wt% or less and TiO2 content of 0.5 wt% or less.

14. The laminated glass for vehicle roof according to claim 13, wherein, The color integration layer is further composed of soda-lime glass with Co3O4 content below 100 ppm and Se content below 5 ppm.

15. The laminated glass for vehicle roof according to any one of claims 1 to 12, wherein the color integration layer is composed of soda-lime glass having a total Fe2O3 content of 1.0 wt% to 4.0 wt% and a total TiO2 content of 500 ppm or less Co3O4 and a Se content of 15 ppm to 40 ppm or less.

16. The laminated glass for vehicle roof according to any one of claims 1 to 15, Based on the total amount of Fe2O3 and the contents of TiO2, Co3O4, and Se in the hue integration layer, the CIE L a b The chromaticity coordinates represented by the chromaticity coordinates are related to a. The coloring component functions Fa and b are correlated. The coloring component function Fb with correlation is defined as follows: Fa = -3.5 × [total Fe₂O₃ (wt%)] - 1.5 × [TiO₂ (wt%)] + 0.20 × [Se (ppm)], and Fb = [Total Fe2O3 (wt%)] + 4 × [TiO2 (wt%)] - 43 × 10 -4 ×[Co3O4 (ppm)] + 0.4 × 10 -4 ×[Se (ppm)]; At this point, the tone integration layer is composed of soda-lime glass that satisfies -9≤Fa≤1 and -5≤Fb≤10.

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