Glass for roof and automobile

Abstract

The application relates to a glass for a roof and a vehicle, comprising a glass body, wherein the glass body is a heat insulation area in the area corresponding to each seat, and the remaining area of the glass body is a low-function transmissive area; the heat insulation area is a high-function heat insulation area in the area corresponding to the head of a seat passenger, and the other area of the heat insulation area is a function transition area; the heat insulation efficiency of the high-function heat insulation area is greater than that of the function transition area; and the heat insulation efficiency of the function transition area is greater than that of the low-function transmissive area. The application divides the glass into functional areas, implements high barrier for the heat-sensitive area of the human body, and implements the effect of reducing material and cost for the non-sensitive area.

Description

Technical Field

[0001] This invention relates to the field of automotive glass technology, specifically to a roof glass and an automobile. Background Technology

[0002] In recent years, as consumers' demands for technological sophistication and intelligence in automobiles have increased, and as the requirements for the drag coefficient of new energy vehicles have become increasingly stringent, vehicle designs have become increasingly lower and more streamlined. Full-width roofs are gradually replacing traditional metal roofs and panoramic sunroofs, significantly enhancing the sense of technology and aesthetics. However, while lower drag and technological advancements have improved, they have also brought passengers' heads closer to the roof glass, resulting in a stronger burning sensation on their scalps when exposed to intense sunlight in summer, leading to a new type of market complaint.

[0003] Based on the above issues, most manufacturers on the market adopt two main approaches: one is to add a simple, easy-to-install sunshade. To facilitate customer installation and removal, corresponding easy-to-install clips and foldable curtain panels have been developed, such as the sunshade clips and sunshade assembly described in patent CN218934275U. These clips have a simple structure, can connect to the sunshade body, and can be fixed in the gap between the panoramic sunroof and the vehicle interior trim. The sunshade assembly includes the sunshade body and multiple clips, ensuring the reliability and stability of the sunshade body's installation and preventing it from easily falling off during vehicle bumps, thus ensuring passenger comfort. However, adding a simple sunshade primarily blocks heat radiation from sunlight. While providing shade, it also weakens the bright, spacious feel of a full-width roof, only addressing customer complaints about heat without truly solving the customer's comprehensive needs for both light transmission and heat insulation in a full-width roof.

[0004] Furthermore, there has been further research on heat-insulating glass in the market. For example, patent document CN105461237B describes a LOW-E low-emissivity vacuum heat-insulating glass and its production method. This document provides a LOW-E low-emissivity vacuum heat-insulating glass and its production method. The glass includes: a vacuum glass substrate, comprising a first glass substrate and a second glass substrate, connected by a sealant and evacuated to form a vacuum cavity; a low-emissivity coating applied to the opposite side of the first glass substrate; and a heat-insulating coating applied to the opposite side of the second glass substrate. The low-emissivity coating comprises a zinc oxide aluminum layer, a silver layer, and a silicon aluminum alloy layer stacked from the inside out. The vacuum + low-emissivity technology employed has good adaptability for heat insulation and reducing secondary radiation. This product is widely used in the construction industry, but replicating this solution to automotive roof glass presents two problems. On the one hand, in the construction industry, the distance between people and glass is usually more than 1 meter. However, the current conditions for automotive applications are that the distance between the head and the roof glass is about 20mm, which is far more stringent than in the construction industry, and the heat insulation requirements are much stricter. On the other hand, the technology of creating a vacuum between the first and second glass substrates, due to the large pressure difference between the inside and outside, is prone to glass shattering, causing safety issues inside the vehicle. Another example is a high-transparency EVA film-laminated dimming glass mentioned in patent document CN206520285U, which replaces the EVA film with a vacuum, solving the problems of glass explosion-proof and dimming. However, its manufacturing cost is high, and it is currently widely used in the digital industry, but it does not have an economic advantage for automotive roof glass.

[0005] Therefore, it is necessary to develop a new type of roof glass and automobile. Summary of the Invention

[0006] The purpose of this invention is to provide a roof glass and automobile that can provide high barrier properties to the heat-sensitive areas of the human body.

[0007] In a first aspect, the present invention provides a glass for vehicle roofs, comprising a glass body, wherein the glass body is a heat-insulating area in the area corresponding to each seat, and the remaining area of ​​the glass body is a low-performance transmission area.

[0008] The heat insulation zone is a high-function heat insulation zone in the area corresponding to the head of the seat occupant, and the other areas of the heat insulation zone are functional transition zones.

[0009] The heat insulation efficiency of the high-performance heat insulation zone is greater than that of the functional transition zone.

[0010] The thermal insulation efficiency of the functional transition zone is greater than that of the low-functionality transmission zone.

[0011] Optionally, the high-performance heat insulation zone located in the front row includes an ideal head envelope area and a scene adjustment requirement area; since the front seats can be adjusted forward and backward, a scene adjustment requirement area is provided to meet the range of changes in head envelope when the vehicle seats are adjusted forward and backward.

[0012] The high-performance insulation zone located in the rear row includes an ideal head envelope area.

[0013] Optionally, the high-performance heat insulation zone includes an outer glass sheet, a first coating layer, a PVB film layer, an inner glass sheet, and a low-e layer arranged sequentially.

[0014] Optionally, the first coating layer includes layers a to g sequentially disposed, wherein:

[0015] The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm.

[0016] The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm;

[0017] The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm;

[0018] The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0019] The e-th layer is a thermal insulation 2Ag layer with a thickness of 45nm to 75nm;

[0020] The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0021] The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm.

[0022] The silicon nitride layer (Si3N4) is a transparent thin film. Its excellent physicochemical properties ensure the high-temperature oxidation resistance and low-temperature impact resistance of the first coating, and it also has good visible light transmittance. The blue tungsten oxide layer (W...) 20 O 58 The tungsten oxide itself is light blue, which enriches the product's color, enhances the visual texture of the glass, and blurs the differences in the transition zone. Simultaneously, blue tungsten oxide possesses excellent near-infrared absorption. The zinc aluminum oxide layer (AlZnOx) and the heat-insulating 2Ag layer form a high-performance heat-insulating zone, providing low transmittance and high reflectivity in the mid- and far-infrared ranges. Through the absorption and reflection of near, mid, and far-infrared rays, the infrared energy reaching the scalp is reduced, thereby reducing head heating due to radiation. The nickel chromate layer (NiCr) protects the silver layer, primarily by reducing the anti-reflective effect caused by Ag oxidation.

[0023] Optionally, the functional transition zone includes an outer glass sheet, a second coating layer, a PVB film layer, an inner glass sheet, and a low-e layer arranged sequentially.

[0024] Optionally, the second coating includes layers a to g sequentially disposed, wherein:

[0025] The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm.

[0026] The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm;

[0027] The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm;

[0028] The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0029] The e-th layer is a heat-insulating Ag layer with a thickness of 25nm to 45nm;

[0030] The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0031] The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm;

[0032] The thickness of the heat insulation Ag layer in the functional transition zone is set to 25nm~45nm, and the material is reduced in the non-sensitive area to achieve the effect of cost reduction.

[0033] Optionally, the low-performance transmission region includes an outer glass sheet, a third coating layer, a PVB film layer, an inner glass sheet, and a low-e layer arranged sequentially.

[0034] Optionally, the third coating layer comprises layers a to g sequentially disposed, wherein:

[0035] The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm.

[0036] The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm;

[0037] The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm;

[0038] The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0039] The e-th layer is a heat-insulating Ag layer with a thickness of 15nm to 25nm;

[0040] The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0041] The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm;

[0042] The thickness of the heat-insulating Ag layer in the low-function transmission zone is set to 15nm~25nm, and the material is reduced in the non-sensitive area to achieve the effect of cost reduction.

[0043] Optionally, the third coating layer comprises layers a to g sequentially disposed, wherein:

[0044] The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm.

[0045] The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm;

[0046] The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm;

[0047] The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0048] The e-th layer is an Al layer with a thickness of 15nm to 25nm;

[0049] The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm;

[0050] The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm;

[0051] By using an Al layer for the e-th layer in the low-performance transmission region and using low-cost Al for the non-sensitive region, the cost can be reduced.

[0052] Secondly, the automobile described in this invention uses the roof glass as described in this invention.

[0053] The beneficial effects of this invention are as follows: Based on the requirements of vehicle ergonomics and the functional differentiation of the roof glass according to the usage scenario, this invention provides high barrier properties for heat-sensitive areas and reduces materials and costs for non-sensitive areas. Furthermore, since the added metals and metal oxides are all nanoscale, they do not subjectively create a visually appealing, blocky texture in the image, thus largely preserving the technological and aesthetic feel of the full-width roof. Attached Figure Description

[0054] Figure 1 This is a human-machine layout diagram of the top glass thermal insulation system in this embodiment;

[0055] Figure 2 This is a schematic diagram of the roof glass in this embodiment;

[0056] Figure 3 This is the condition for enabling the partitioned heat insulation human-machine arrangement of the roof glass in this embodiment;

[0057] Figure 4 This is an enlarged cross-sectional view of the roof glass BB in this embodiment;

[0058] Figure 5 for Figure 4 Enlarged diagram of section C;

[0059] In the diagram: 1-Head envelope (1-1 Front head envelope, 1-2 Rear head envelope), 2-Glass body, 3-Eye box. 21-High-performance heat insulation zone, 21a-Ideal head envelope zone, 21b-Scene adjustment requirement zone, 22-Low-performance transmission zone, 23-Non-uniform functional transition zone. 211-Outer glass sheet, 212a-First coating, 212b-Second coating, 212c-Third coating, 213-PVB film layer, 214-Inner glass sheet, 215-Low-e layer. Detailed Implementation

[0060] The following description, with reference to the accompanying drawings and preferred embodiments, illustrates the implementation of the technical solution of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0061] like Figure 2 As shown, in this embodiment, a roof glass includes a glass body, based on the assumption of a human head envelope (including a front head envelope 1-1 and a rear head envelope 1-2, see [reference]). Figure 1 The glass body has heat-insulating areas corresponding to each seat, and the remaining areas of the glass body are low-performance transmission areas 22. The heat-insulating area corresponding to the head of the seat occupant is a high-performance heat-insulating area 21, and the remaining areas of the heat-insulating area 21 are functional transition areas 23. The heat insulation efficiency of the high-performance heat-insulating area 21 is greater than that of the functional transition area 23. The heat insulation efficiency of the functional transition area 23 is greater than that of the low-performance transmission area 22. This roof glass solves the problem of scalp burning under harsh conditions where the head is less than 30mm from the top glass. See [link / reference]. Figure 3 .

[0062] In this embodiment, based on the ergonomic design of commonly used low-e glass, the roof glass is divided into a high-performance heat insulation zone 21, a functional transition zone 23, and a low-performance transmission zone 22. By reducing the coating thickness in non-heat-sensitive areas (including the functional transition zone 23 and the low-performance transmission zone 22) or replacing it with low-cost materials, the product's economic efficiency is improved. Furthermore, by increasing the heat insulation efficiency of the functional heat insulation zone 21, customer complaints about scalp burning sensations are addressed. This roof glass can be widely used in roof windows and full-width automotive glass.

[0063] In this embodiment, the high-performance heat insulation zone 21 located in the front row includes an ideal head envelope zone 21a and a scene adjustment requirement zone 21b; since the front seats can be adjusted forward and backward, a scene adjustment requirement zone 21b is provided to meet the range of head envelope changes under the forward and backward adjustment state of the vehicle seats; the high-performance heat insulation zone 21 located in the rear row includes an ideal head envelope zone 21a.

[0064] like Figure 4 As shown, in this embodiment, the high-performance heat insulation zone 21 includes an outer glass sheet 211, a first coating layer 212a, a PVB film layer 213, an inner glass sheet 214, and a low-e layer 215 arranged sequentially.

[0065] like Figure 5 As shown, in this embodiment, the first coating 212a includes layers a to g sequentially disposed, wherein: layer a is a silicon nitride layer with a thickness of 35nm to 40nm; layer b is a blue tungsten oxide layer with a thickness of 7nm to 15nm; layer c is a zinc aluminum oxide layer with a thickness of 20nm to 40nm; layer d is a nickel chromate layer with a thickness of 7nm to 15nm; layer e is a heat-insulating 2Ag layer with a thickness of 45nm to 75nm; layer f is a nickel chromate layer with a thickness of 7nm to 15nm; and layer g is a silicon nitride layer with a thickness of 35nm to 40nm. The silicon nitride layer (Si3N4) is a transparent thin film, whose excellent physicochemical properties ensure the high-temperature oxidation resistance and low-temperature impact resistance of the first coating, and also have good visible light transmittance. The blue tungsten oxide layer (W... 20 O 58 The blue tungsten oxide itself is light blue, which enriches the product's color, enhances the visual texture of the glass, and blurs the differences in the transition zone. Simultaneously, blue tungsten oxide possesses excellent near-infrared absorption. The zinc aluminum oxide layer (AlZnOx) and the heat-insulating 2Ag layer form a high-performance heat-insulating zone, providing low transmittance and high reflectivity in the mid- and far-infrared ranges. Through the absorption and reflection of near, mid, and far-infrared rays, it reduces the infrared energy reaching the scalp, thereby reducing head heating due to radiation. The nickel chromate layer (NiCr) protects the silver layer, primarily by reducing the anti-reflective effect caused by oxidation of the Ag reflective layer.

[0066] like Figure 4 As shown, in this embodiment, the functional transition area 23 includes a glass outer sheet 211, a second coating layer 212b, a PVB film layer 213, a glass inner sheet 214, and a low-e layer 215 arranged sequentially.

[0067] like Figure 5As shown, in this embodiment, the second plating layer 212b includes layers a to g sequentially disposed, wherein: layer a is a silicon nitride layer with a thickness of 35nm to 40nm; layer b is a blue tungsten oxide layer with a thickness of 7nm to 15nm; layer c is a zinc aluminum oxide layer with a thickness of 20nm to 40nm; layer d is a nickel chromate layer with a thickness of 7nm to 15nm; layer e is a heat-insulating Ag layer with a thickness of 25nm to 45nm; layer f is a nickel chromate layer with a thickness of 7nm to 15nm; and layer g is a silicon nitride layer with a thickness of 35nm to 40nm. By setting the thickness of the heat-insulating Ag layer in the functional transition region 23 to 25nm to 45nm, material reduction is implemented in the non-sensitive area to achieve cost reduction.

[0068] like Figure 4 As shown, in this embodiment, the low-performance transmission region 22 includes an outer glass sheet 211, a third coating layer 212c, a PVB film layer 213, an inner glass sheet 214, and a low-e layer 215 arranged sequentially.

[0069] like Figure 5 As shown, in this embodiment, the third coating layer 212c includes layers a to g arranged sequentially, wherein: layer a is a silicon nitride layer with a thickness of 35nm to 40nm; layer b is a blue tungsten oxide layer with a thickness of 7nm to 15nm; layer c is a zinc aluminum oxide layer with a thickness of 20nm to 40nm; layer d is a nickel chromate layer with a thickness of 7nm to 15nm; layer e is a heat-insulating Ag layer with a thickness of 15nm to 25nm; layer f is a nickel chromate layer with a thickness of 7nm to 15nm; and layer g is a silicon nitride layer with a thickness of 35nm to 40nm. By setting the thickness of the heat-insulating Ag layer in the low-functionality transmission region 22 to 15nm to 25nm, material reduction is implemented in the non-sensitive area to achieve the effect of cost reduction.

[0070] Meanwhile, the thickness of the e-th layer can also be a gradual thickness, that is, the thickness of the functional transition zone 23 near the high-function heat insulation zone 21 is equivalent to the thickness near the low-function transmission zone 22, and the thickness is gradual. The purpose is to make the top glass appear without obvious blocks in the visual effect, so as to achieve a more uniform overall light transmission effect.

[0071] In this embodiment, the third coating layer 212c includes layers a to g sequentially disposed, wherein: layer a is a silicon nitride layer with a thickness of 35nm to 40nm; layer b is a blue tungsten oxide layer with a thickness of 7nm to 15nm; layer c is a zinc aluminum oxide layer with a thickness of 20nm to 40nm; layer d is a nickel chromate layer with a thickness of 7nm to 15nm; layer e is an Al layer with a thickness of 15nm to 25nm; layer f is a nickel chromate layer with a thickness of 7nm to 15nm; and layer g is a silicon nitride layer with a thickness of 35nm to 40nm. In this embodiment, using an Al layer for layer e of the low-functionality transmission region 22 can achieve cost reduction.

[0072] In this embodiment, the first coating layer 212a, the second coating layer 212b, and the third coating layer 212c are deposited on the side of the outer glass sheet 211 near the PVB film layer 213, i.e., the second side of the laminated glass, using a vacuum ion sputtering coating method that is currently a relatively mature manufacturing process.

[0073] During processing, the glass is cleaned and then fed into a magnetron sputtering machine for layer-by-layer magnetron sputtering. First, an AC power source is used to magnetron sputter a silicon nitride layer with a thickness of 35nm to 40nm (i.e., layer a). Then, a 7nm thick layer is sputtered. A blue tungsten oxide layer of ~15nm (i.e., layer b) is then magnetron sputtered, followed by a zinc aluminum oxide layer of 20nm~40nm thickness (i.e., layer c), then a nickel chromate layer of 7nm~15nm thickness (i.e., layer d), and then a functional layer layer e is magnetron sputtered via a DC power supply. The thickness of layer e in the first plating layer 212a is 45nm~75nm, the thickness of layer e in the second plating layer 212b is 25nm~45nm, the thickness of layer e in the third plating layer 212c is 15nm~25nm, then a nickel chromate layer of 7nm~15nm thickness (i.e., layer f) is magnetron sputtered, and a silicon nitride layer of 35~40nm thickness (i.e., layer g) is sputtered.

[0074] The test performance of the roof glass obtained based on the above layout design is as follows:

[0075]

[0076] According to actual test results, the optimized human-machine layout scheme has a good overall sunlight transmission blocking effect in the head area, with no significant attenuation of visible light transmittance and a significant gain.

[0077] This embodiment primarily focuses on the ergonomic design requirements of vehicles and functionally differentiates the top glass based on usage scenarios. It implements high barrier properties for heat-sensitive areas and reduces material usage in non-sensitive areas to lower costs. Furthermore, because the added metals and metal oxides are all nanoscale and use a zoned transition approach, they do not subjectively create a visually pleasing sense of light and dark blocks in the image, thus largely preserving the technological and aesthetic appeal of the full-width roof.

[0078] In this embodiment, a car uses roof glass as described in this embodiment.

[0079] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A type of glass for vehicle roofs, characterized in that: Includes a glass body (2), wherein the area of ​​the glass body (2) corresponding to each seat is a heat insulation area, and the remaining area of ​​the glass body (2) is a low-function transmission area (22). The heat insulation zone is a high-function heat insulation zone (21) in the area corresponding to the head of the seat occupant, and the other areas of the heat insulation zone are functional transition zones (23). The insulation efficiency of the high-performance insulation zone (21) is greater than that of the functional transition zone (23); The thermal insulation efficiency of the functional transition zone (23) is greater than that of the low functional transmission zone (22). The high-performance heat insulation zone (21) located in the front row includes an ideal head envelope area (21a) and a scene adjustment demand area (21b). The scene adjustment demand area (21b) is used to adapt to the front seat's fore-and-aft adjustment to cover the range of head envelope changes in the front seat's fore-and-aft adjustment state. The high-performance heat insulation zone (21) located in the rear row includes an ideal head envelope area (21a).

2. The roof glass according to claim 1, characterized in that: The high-performance heat insulation zone (21) includes an outer glass sheet (211), a first coating layer (212a), a PVB film layer (213), an inner glass sheet (214), and a low-e layer (215) arranged sequentially.

3. The roof glass according to claim 2, characterized in that: The first coating (212a) comprises layers a to g, which are sequentially disposed, wherein: The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm. The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm; The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm; The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The e-th layer is a thermal insulation 2Ag layer with a thickness of 45nm to 75nm; The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm.

4. The roof glass according to claim 1, characterized in that: The functional transition area (23) includes an outer glass sheet (211), a second coating layer (212b), a PVB film layer (213), an inner glass sheet (214), and a low-e layer (215) arranged sequentially.

5. The roof glass according to claim 4, characterized in that: The second coating (212b) comprises layers a to g, which are sequentially disposed, wherein: The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm. The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm; The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm; The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The e-th layer is a heat-insulating Ag layer with a thickness of 25nm to 45nm; The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm.

6. The roof glass according to claim 1, characterized in that: The low-function transmission area (22) includes an outer glass sheet (211), a third coating layer (212c), a PVB film layer (213), an inner glass sheet (214), and a low-e layer (215) arranged sequentially.

7. The roof glass according to claim 6, characterized in that: The third coating (212c) comprises layers a through g, which are sequentially disposed, wherein: The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm. The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm; The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm; The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The e-th layer is a heat-insulating Ag layer with a thickness of 15nm to 25nm; The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm.

8. The roof glass according to claim 6, characterized in that: The third coating (212c) comprises layers a through g, which are sequentially disposed, wherein: The first layer (a) is a silicon nitride layer with a thickness of 35 nm to 40 nm. The b-th layer is a blue tungsten oxide layer with a thickness of 7 nm to 15 nm; The c-th layer is a zinc-aluminum oxide layer with a thickness of 20nm to 40nm; The d-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The e-th layer is an Al layer with a thickness of 15nm to 25nm; The f-th layer is a nickel chromate layer with a thickness of 7nm to 15nm; The g-th layer is a silicon nitride layer with a thickness of 35nm to 40nm.

9. A car, characterized in that: The roof glass as described in any one of claims 1 to 8 is used.

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