Optical film, automotive glass, and vehicle

Abstract

The present application relates to an optical film, automobile glass and vehicle. The optical film comprises at least four stacks and one first high refractive index layer, each stack comprises one second high refractive index layer and one low refractive index layer, in the at least four stacks, one low refractive index layer is stacked between every two adjacent second high refractive index layers, and one second high refractive index layer is stacked between every two adjacent low refractive index layers; the first high refractive index layer is in direct contact with the low refractive index layer in the adjacent stack; the refractive index of the first high refractive index layer and the second high refractive index layer is greater than or equal to 1.8, and the refractive index of the low refractive index layer is less than or equal to 1.7; the optical transmittance of the optical film in the wavelength range of 380nm-780nm is less than 1%, and the optical transmittance in the wavelength range of 920nm-980nm is greater than 85%, which is applied to automobile glass, can shield the infrared signal transmission area, and will not attenuate the infrared signal transmittance.

Description

Technical Field

[0001] The present invention relates to the field of optical films, in particular to an optical film, automobile glass and a vehicle. Background Art

[0002] With the development and popularization of intelligent automobiles, various signal sensors are integrated inside automobiles. Among them, infrared cameras are the most widely used one, and are widely integrated into application scenarios such as automobile intelligent B-pillars, automobile front windshields, and automobile side windows.

[0003] Because camera integration often creates an unsightly appearance, the corresponding camera signal-transmitting area of ​​the vehicle's glass needs to be masked to create an aesthetically pleasing effect. This prevents the integrated camera from being visible from outside the vehicle. Currently, a common masking method is to cover the edges of the signal-transmitting area with black ink. However, because the ink prevents infrared signals from passing through, the infrared signal-transmitting area must be left exposed. While this method achieves a certain aesthetic effect, the internal camera can still be seen through the left-out area. Summary of the Invention

[0004] Based on this, some embodiments of the present invention provide an optical film that can absorb or reflect visible light while making infrared light in a specific band highly transparent. When used in automotive glass, it can completely shield the infrared signal transmission area without attenuating the infrared signal transmittance.

[0005] In addition, other embodiments of the present invention further provide an automotive glass and a vehicle comprising the above-mentioned optical film.

[0006] An optical film comprising at least four stacked layers and a first high refractive index layer:

[0007] Each of the stacked layers comprises a second high refractive index layer and a low refractive index layer, and in at least four of the stacked layers, one layer of the low refractive index layer is stacked between every two adjacent layers of the second high refractive index layer, and one layer of the second high refractive index layer is stacked between every two adjacent layers of the low refractive index layer;

[0008] The first high refractive index layer is in direct contact with the low refractive index layer in the adjacent stack;

[0009] The refractive indexes of the first high refractive index layer and the second high refractive index layer are both ≥1.8, and the refractive index of the low refractive index layer is ≤1.7;

[0010] The optical transmittance of the optical film in the wavelength range of 380nm to 780nm is less than 1%, and the optical transmittance in the wavelength range of 920nm to 980nm is greater than 85%.

[0011] In some embodiments, among the at least four stacked layers, in at least three of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0012] In some embodiments, in at least four of the stacked layers, in at least two of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0013] In some embodiments, the total thickness of the optical film is ≥1000 nm;

[0014] Optionally, the total thickness of the optical film is ≥1200 nm;

[0015] Optionally, the total thickness of the optical film is ≥1300 nm.

[0016] In some embodiments, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥300 nm; the total thickness of the plurality of low refractive index layers is ≥700 nm.

[0017] Optionally, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥400 nm;

[0018] Optionally, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥500 nm.

[0019] In some embodiments, the thickness of the first high refractive index layer and the second high refractive index layer are both 30 nm to 100 nm.

[0020] In some embodiments, among the plurality of low refractive index layers, the thickness of the thickest low refractive index layer is ≥300 nm;

[0021] Optionally, the thickness of the thickest low refractive index layer is ≥400 nm;

[0022] In some embodiments, a low refractive index layer having the thickest thickness is disposed between the two stacked layers.

[0023] In some embodiments, among the plurality of low refractive index layers, except for the thickest low refractive index layer, the thickness of the remaining low refractive index layers is independently 70 nm to 170 nm.

[0024] In some embodiments, in the optical film, the number of the stacked layers is ≤7.

[0025] In some embodiments, the difference between the refractive index of the first high refractive index layer and the refractive index of the low refractive index layer is ≥ 0.3; and

[0026] The difference between the refractive index of the second high refractive index layer and the refractive index of the low refractive index layer is ≥0.3.

[0027] In some embodiments, the materials of the first high refractive index layer and the second high refractive index layer include TiO x 、SiN x 、NbO x 、ZrO x , Si, ZnS and ZnSe, and the material of the low refractive index layer includes SiO x 、SiON、MF x 、AlO x and MgO x One or more of , wherein M is a metal element.

[0028] An automotive glass comprises a glass substrate and an optical film, wherein the glass substrate has an outer surface and an inner surface opposite to each other, the optical film is arranged on the inner surface, the glass substrate is provided with an information collection area, and the orthographic projection of the optical film on the inner surface completely covers the information collection area, and the optical film is the optical film described above.

[0029] In some embodiments, along a direction away from the inner surface of the glass substrate, the first high refractive index layer is farthest from the inner surface of the glass substrate.

[0030] In some embodiments, the automobile glass includes one of B-pillar automobile glass, front windshield automobile glass and side window automobile glass.

[0031] A vehicle comprises the above-mentioned automobile glass.

[0032] The above-mentioned optical film includes multiple stacked high-refractive index layers and low-refractive index layers. By optimizing the high-refractive index layers and the low-refractive index layers, the optical film can reduce the visible light transmittance while ensuring high infrared transmittance in the infrared band of 920nm~980nm. When used on automotive glass, it can shield the infrared signal transmission area without attenuating the infrared signal transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of an optical film in some embodiments of the present invention;

[0035] Figure 2 A schematic diagram of the structure of automobile glass in some embodiments of the present invention;

[0036] Figure 3 This is a schematic structural diagram of automobile glass in some embodiments of the present invention. DETAILED DESCRIPTION

[0037] To facilitate understanding of the present invention, the present invention will be described more fully below in conjunction with the specific embodiments. Preferred embodiments of the present invention are provided in the specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] Unless otherwise specified or there is a contradiction, the terms and phrases used in this invention have the following meanings:

[0040] In this disclosure, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Therefore, a feature designated as "first" or "second" may explicitly or implicitly include at least one of such features.

[0041] In the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, "one or several" refers to any one, any two or more of the listed items. Among them, "several" refers to any two or more of the listed items.

[0043] In the present invention, the percentage concentration involved, unless otherwise specified, refers to the final concentration. The final concentration refers to the percentage of the added component in the system after the addition of the component.

[0044] The terms "preferably," "more preferably," and the like, used herein refer to embodiments of the present invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the present invention.

[0045] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Furthermore, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are understood to include any and all subranges subsumed therein.

[0046] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0047] The terms "including," "having," and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0048] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this disclosure may be combined with other embodiments.

[0049] As described in the background, while traditional methods of masking the information collection area with ink achieve a certain aesthetic effect, the internal camera can still be seen through the remaining light-transmitting area. Therefore, some embodiments of the present invention provide an optical film that can completely block the infrared signal transmission area without attenuating the infrared signal transmittance. Specifically, it is designed to absorb or reflect visible light in the 380nm to 780nm range, while also not attenuating the transmittance of infrared light in the 920nm to 980nm band.

[0050] The first aspect of the present invention provides an optical film comprising at least four stacked layers and one first high refractive index layer, each stack comprising a second high refractive index layer and a low refractive index layer, wherein in the at least four stacks, a low refractive index layer is stacked between every two adjacent second high refractive index layers, and a second high refractive index layer is stacked between every two adjacent low refractive index layers; the first high refractive index layer is in direct contact with the low refractive index layer in the adjacent stack; the refractive indexes of the first high refractive index layer and the second high refractive index layer are both ≥1.8, and the refractive index of the low refractive index layer is ≤1.7; the optical transmittance of the optical film in the wavelength range of 380nm~780nm is <1%, and the optical transmittance in the wavelength range of 920nm~980nm is >85%. For example, the optical transmittance of the optical film in the wavelength range of 380nm to 780nm may be, but is not limited to, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, or a range consisting of any two of these values. The optical transmittance of the optical film in the wavelength range of 920nm to 980nm may be, but is not limited to, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or a range consisting of any two of these values. Preferably, the optical transmittance of the optical film in the infrared band of 920nm to 980nm is greater than 90%.

[0051] The above-mentioned optical film can be used to absorb or reflect visible light in the wavelength range of 380nm~780nm, and on this basis has high transmittance for infrared light in the wavelength range of 920nm~980nm. It can be used on automobile glass to completely shield the infrared signal transmission area without attenuating the infrared signal transmittance.

[0052] In some embodiments, the optical film has a stacked number of 4 or more layers. For example, the number of layers can be, but is not limited to, 4, 5, 6, 7, 8, 9, 10, or a range consisting of any two of these values. Preferably, the optical film has a stacked number of 5 or more layers, and more preferably, the optical film has a stacked number of 6 or more layers. On the other hand, considering cost, the number of layers in the optical film is 7 or less.

[0053] In some embodiments, the optical film includes 4 stacked layers and 1 first high refractive index layer, or the optical film includes 5 stacked layers and 1 first high refractive index layer, or the optical film includes 6 stacked layers and 1 first high refractive index film layer, or the optical film includes 7 stacked layers and 1 first high refractive index layer.

[0054] In some embodiments, among the at least four stacked layers, in at least three stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0055] In some embodiments, the optical film includes four stacked layers and one first high refractive index layer, wherein in at least three of the four stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in the four stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0056] In other embodiments, the optical film includes five stacked layers and one first high refractive index layer, and in at least three of the five stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0057] In yet other embodiments, the optical film includes six stacked layers and one first high refractive index layer. Among the six stacked layers, in at least three of the six stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least five of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0058] In yet other embodiments, the optical film comprises seven stacked layers and one first high refractive index layer, wherein in at least three of the seven stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least five of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer. Alternatively, in at least six of the stacked layers, the thickness D1 of the second high refractive index layer is less than or equal to the thickness D2 of the low refractive index layer.

[0059] In some embodiments, among the at least four stacked layers, in at least two stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0060] In some embodiments, the optical film includes four stacked layers and one first high refractive index layer. In at least two of the four stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0061] In other embodiments, the optical film includes five stacked layers and one first high refractive index layer. Among the five stacked layers, in at least two of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least three of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0062] In yet other embodiments, the optical film includes six stacked layers and one first high refractive index layer. Among the six stacked layers, in at least two of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least three of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0063] In yet other embodiments, the optical film includes seven stacked layers and one first high refractive index layer, wherein in at least two of the seven stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least three of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer. Alternatively, in at least four of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

[0064] In some embodiments, the total thickness of the optical film is ≥1000 nm. For example, the total thickness of the optical film can be, but is not limited to, 1000 nm, 1100 nm, 1200 nm, 1300 nm, 1400 nm, 1500 nm, 1600 nm, 1700 nm, 1800 nm, 1900 nm, 2000 nm, or a range consisting of any two of these values. Alternatively, the total thickness of the optical film is ≥1100 nm. Alternatively, the total thickness of the optical film is ≥1200 nm. Alternatively, the total thickness of the optical film is ≥1300 nm. Further, the total thickness of the optical film is ≤2000 nm.

[0065] In some embodiments, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥300nm. That is, the total thickness of the second high refractive index layers in all stacks and a first high refractive index film layer independent of the stack is ≥300nm. For example, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers can be, but is not limited to, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm, or a range consisting of any two of these values. Preferably, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥400nm, more preferably, the total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥500nm.

[0066] In some embodiments, the total thickness of the low refractive index layer is ≥700 nm. For example, the total thickness of the low refractive index layer can be, but is not limited to, 700 nm, 750 nm, 800 nm, 850 nm, 900 nm, 950 nm, 1000 nm, 1050 nm, 1100 nm, 1150 nm, 1200 nm, 1250 nm, 1300 nm, 1350 nm, 1400 nm, or a range consisting of any two of these values. Preferably, the total thickness of the low refractive index layer is 700 nm to 1400 nm.

[0067] In some embodiments, the thickness of the first high refractive index layer and the second high refractive index layer are each independently 30 nm to 100 nm. For example, the thickness of the first high refractive index layer and the second high refractive index layer are each independently 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 85 nm, 90 nm, 95 nm, 100 nm, or a range consisting of any two of these values.

[0068] In some embodiments, among the plurality of low refractive index layers, the thickness of the thickest low refractive index layer is ≥300 nm. Alternatively, the thickness of the thickest low refractive index layer is ≥400 nm. For example, the thickness of the thickest low refractive index layer can be, but is not limited to, 300 nm, 320 nm, 340 nm, 360 nm, 380 nm, 400 nm, 420 nm, 440 nm, 460 nm, 480 nm, 500 nm, or a range consisting of any two of these values.

[0069] In some embodiments, the thickest low-refractive-index layer is disposed between two stacked layers. It is understood that the thickest low-refractive-index layer is located neither in the first nor in the last stacked layer. For example, an optical film includes five stacked layers, which are sequentially labeled the first stacked layer, the second stacked layer, the third stacked layer, the fourth stacked layer, and the fifth stacked layer. The thickest low-refractive-index layer is located in one of the second, third, and fourth stacked layers.

[0070] In some embodiments, except for the thickest low-refractive index layer, the thickness of each of the remaining low-refractive index layers is independently 70 nm to 170 nm. For example, the thickness of each of the remaining low-refractive index layers is independently 70 nm, 80 nm, 90 nm, 100 nm, 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, 160 nm, 170 nm, or a range consisting of any two of these values.

[0071] In some embodiments, the difference between the refractive index of the first high refractive index layer and the refractive index of the low refractive index layer is greater than or equal to 0.3; and the difference between the refractive index of the second high refractive index layer and the refractive index of the low refractive index layer is greater than or equal to 0.3.

[0072] In some embodiments, the refractive index of the first high refractive index layer and the second high refractive index layer is greater than or equal to 1.8. Preferably, the refractive index of the first high refractive index layer and the second high refractive index layer is greater than or equal to 2. Specifically, the material of the first high refractive index layer and the second high refractive index layer includes TiO x (Titanium oxide), SiN x (silicon nitride), NbO x (Niobium oxide), ZrO x (zirconium oxide), Si (silicon), ZnS (zinc sulfide) and ZnSe (zinc selenide). Optionally, the material of the high refractive index layer includes SiN x or ZnSe.

[0073] It is understood that the materials of the first high refractive index layer and the second high refractive index layers can be the same or different. Optionally, the materials of the first high refractive index layer and the second high refractive index layers are the same.

[0074] In some embodiments, the refractive index of the low refractive index layer is ≤1.7. Specifically, the material of the low refractive index layer includes SiO x (silicon oxide), SiON (silicon oxynitride), MF x (metal fluoride), AlO x (aluminum oxide) and MgO x (magnesium oxide) one or more. Among them, MF x Where M is a metal element, and M includes one or more of Mg, Ba, Al, Ce, Y and La. Optionally, the material of the low refractive index layer includes SiO x .

[0075] It is understood that the materials of the low refractive index layers can be the same or different. Optionally, the materials of the low refractive index layers are the same.

[0076] In some embodiments, the materials of the first high refractive index layer and the second high refractive index layer are SiN x , refractive index ≥ 2, the material of the low refractive index layer is SiO2, refractive index ≤ 1.7. In other embodiments, the material of the first high refractive index layer and the second high refractive index layer is ZnSe, refractive index ≥ 2, and the material of the low refractive index layer is SiO2, refractive index ≤ 1.7.

[0077] It is understood that the above optical film can be prepared by methods commonly used in the art, such as magnetron sputtering.

[0078] See also Figure 1 , taking an optical film including 7 stacked layers and 1 first high refractive index layer as an example, a structural schematic diagram of an optical film is given. Figure 1 In the embodiment, the optical film 100 includes a second high refractive index layer H1, a low refractive index layer L1, a second high refractive index layer H2, a low refractive index layer L2, a second high refractive index layer H3, a low refractive index layer L3, a second high refractive index layer H4, a low refractive index layer L4, a second high refractive index layer H5, a low refractive index layer L5, a second high refractive index layer H6, a low refractive index layer L6, a second high refractive index layer H7, a low refractive index layer L7 and a first high refractive index layer H8 stacked in sequence. Among them, the second high refractive index layer H1 and the low refractive index layer L1 constitute the first stack A1, the second high refractive index layer H2 and the low refractive index layer L2 constitute the second stack A2, the second high refractive index layer H3 and the low refractive index layer L3 constitute the stack A3, the second high refractive index layer H4 and the low refractive index layer L4 constitute the fourth stack A4, the second high refractive index layer H5 and the low refractive index layer L5 constitute the fifth stack A5, the second high refractive index layer H6 and the low refractive index layer L6 constitute the sixth stack A6, and the second high refractive index layer H7 and the low refractive index layer L7 constitute the seventh stack A7.

[0079] It can be understood that when the number of stacked layers is 4, 5, or 6, the structure of the optical film is different from that of the Figure 1 Similar, no further elaboration.

[0080] The second aspect of the present invention also provides an automotive glass, including a glass substrate and an optical film, the glass substrate having a relative outer surface and an inner surface, the optical film being arranged on the inner surface, the glass substrate being provided with an information collection area, and the orthographic projection of the optical film on the inner surface completely covering the information collection area.

[0081] Specifically, the optical film is the optical film provided in the first aspect above, which will not be described in detail.

[0082] In some embodiments, the first high refractive index layer is farthest from the inner surface of the glass substrate in a direction away from the inner surface of the glass substrate.

[0083] In some embodiments, the automobile glass may be, but is not limited to, B-pillar automobile glass, front windshield automobile glass, side window glass, etc.

[0084] In some embodiments, the information collection area corresponds to the signal transmission area of ​​the infrared camera.

[0085] It is understood that the glass substrate may be any commonly used glass in the art, such as single-layer glass, laminated glass, etc., which will not be described in detail here.

[0086] In some embodiments, automotive glass includes a glass substrate and an optical film, the optical film being disposed on an inner surface of the glass substrate. The optical film comprises at least four stacked layers and a first high refractive index layer, each stacked layer comprising a second high refractive index layer and a low refractive index layer, wherein the stacked layers are closer to the glass substrate than the first high refractive index layer. Specifically, the second high refractive index layer in the stacked layers is closer to the glass substrate than the low refractive index layer.

[0087] See also Figure 2 The automobile glass 10 includes a glass substrate 200 and an optical film 100 . The optical film 100 is disposed on the inner surface of the glass substrate 200 .

[0088] Please also refer to Figure 3 , taking an optical film including 7 stacked layers and 1 first high refractive index layer as an example, a structural diagram of automotive glass is given. Figure 3 In the figure, the automotive glass 10 includes a glass substrate 200 and an optical film 100. The optical film 100 is arranged on the inner surface of the glass substrate 200. From close to the glass substrate 200 to away from the glass substrate 200, the optical film 100 includes a second high refractive index layer H1, a low refractive index layer L1, a second high refractive index layer H2, a low refractive index layer L2, a second high refractive index layer H3, a low refractive index layer L3, a second high refractive index layer H4, a low refractive index layer L4, a second high refractive index layer H5, a low refractive index layer L5, a second high refractive index layer H6, a low refractive index layer L6, a second high refractive index layer H7, a low refractive index layer L7 and a first high refractive index layer H8 stacked in sequence. Among them, the second high refractive index layer H1 and the low refractive index layer L1 constitute the first stack A1, the second high refractive index layer H2 and the low refractive index layer L2 constitute the second stack A2, the second high refractive index layer H3 and the low refractive index layer L3 constitute the third stack A3, the second high refractive index layer H4 and the low refractive index layer L4 constitute the fourth stack A4, the second high refractive index layer H5 and the low refractive index layer L5 constitute the fifth stack A5, the second high refractive index layer H6 and the low refractive index layer L6 constitute the sixth stack A6, and the second high refractive index layer H7 and the low refractive index layer L7 constitute the seventh stack A7. Figure 3 In FIG. 2 , the second high refractive index layer H1 is closer to the glass substrate 200 than the first high refractive index layer H8 .

[0089] It can be understood that when the number of laminated layers is 4, 5, or 6, the structure of the automotive glass is different from that of the Figure 3 Similar, no further elaboration.

[0090] By setting an optical film on the automobile glass, the signal collection area of ​​the automobile glass is not transparent to visible light, but has high transparency to specific infrared signals, such as infrared light in the wavelength range of 920nm~980nm.

[0091] The third aspect of the present invention further provides a vehicle comprising the automotive glass according to the second aspect.

[0092] It is understandable that the vehicle may also include conventional components, which will not be described in detail.

[0093] To make the objects and advantages of the present invention more apparent, the optical film of the present invention and its effects are further described in detail below with reference to specific examples. It should be understood that the specific examples described herein are intended only to explain the present invention and are not intended to limit the present invention. The following examples do not include any components other than unavoidable impurities unless otherwise specified. The drugs and instruments used in the examples are conventional in the art unless otherwise specified. Experimental methods not specifying specific conditions in the examples were performed under conventional conditions, such as those described in literature or books, or methods recommended by the manufacturer.

[0094] Example 1

[0095] This embodiment provides an optical film with a total of 15 film layers, including seven stacked layers and a first high refractive index layer, wherein the first high refractive index layer and the second high refractive index layer are both made of SiN x , the refractive index is 2.05, and the material of the low refractive index layer is SiO2, with a refractive index of 1.46. Starting from the inner surface of the automobile glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 85nm; the second layer is the low refractive index layer L1, with a thickness of 73nm; the third layer is the second high refractive index layer H2, with a thickness of 71nm; the fourth layer is the low refractive index layer L2, with a thickness of 135nm; the fifth layer is the second high refractive index layer H3, with a thickness of 71nm; the sixth layer is the low refractive index layer L3, with a thickness of 98nm; the seventh layer is the second high refractive index layer H4, with a thickness of 62nm; the eighth layer is the second high refractive index layer H5, with a thickness of 60nm; the eighth layer is the second high refractive index layer H6, with a thickness of 60nm. The ninth layer is the low refractive index layer L4 with a thickness of 122nm; the ninth layer is the second high refractive index layer H5 with a thickness of 62nm; the tenth layer is the low refractive index layer L5 with a thickness of 107nm; the eleventh layer is the second high refractive index layer H6 with a thickness of 57nm; the twelfth layer is the low refractive index layer L6 with a thickness of 456nm; the thirteenth layer is the second high refractive index layer H7 with a thickness of 90nm; the fourteenth layer is the low refractive index layer L7 with a thickness of 73nm; the fifteenth layer is the first high refractive index layer H8 with a thickness of 62nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, H3 and L3 constitute the third stack, H4 and L4 constitute the fourth stack, H5 and L5 constitute the fifth stack, H6 and L6 constitute the sixth stack, and H7 and L7 constitute the seventh stack. The materials and thicknesses of each film layer are shown in Table 1 below:

[0096] Table 1 Composition of the optical film of Example 1

[0097]

[0098] The optical transmittance of the optical film in the wavelength range of 380nm to 780nm is 0.4%, and the optical transmittance in the wavelength range of 920nm to 980nm is 90.9%.

[0099] Example 2

[0100] This embodiment provides an optical film with a total of 13 film layers, including six stacked layers and a first high refractive index layer, wherein the first high refractive index layer and the second high refractive index layer are both made of ZnSe with a refractive index of 2.6, and the low refractive index layer is both made of SiO2 with a refractive index of 1.46. Starting from the inner surface of the automotive glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 88nm; the second layer is the low refractive index layer L1, with a thickness of 103nm; the third layer is the second high refractive index layer H2, with a thickness of 76nm; the fourth layer is the low refractive index layer L2, with a thickness of 165nm; the fifth layer is the second high refractive index layer H3, with a thickness of 84nm; the sixth layer is the low refractive index layer L3, with a thickness of 145nm; the seventh layer is the second high refractive index layer H4, with a thickness of 53nm; the eighth layer is the low refractive index layer L4, with a thickness of 122nm; the ninth layer is the second high refractive index layer H5, with a thickness of 49nm; the tenth layer is the low refractive index layer L5, with a thickness of 456nm; the eleventh layer is the second high refractive index layer H6, with a thickness of 77nm; the twelfth layer is the low refractive index layer L6, with a thickness of 73nm; and the thirteenth layer is the first high refractive index layer H7, with a thickness of 53nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, H3 and L3 constitute the third stack, H4 and L4 constitute the fourth stack, H5 and L5 constitute the fifth stack, and H6 and L6 constitute the sixth stack. The materials and thicknesses of each film layer are shown in Table 2 below:

[0101] Table 2 Composition of the optical film of Example 2

[0102]

[0103] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 0.6%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 90.5%.

[0104] Example 3

[0105] This embodiment provides an optical film with a total of 11 film layers, including five stacked layers and a first high refractive index layer, wherein the materials of the first high refractive index layer and the second high refractive index layer are both SiN xThe refractive index of the film is 2.05, and the material of the low refractive index layer is SiO2 with a refractive index of 1.46. Starting from the inner surface of the automotive glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 99nm; the second layer is the low refractive index layer L1, with a thickness of 73nm; the third layer is the second high refractive index layer H2, with a thickness of 89nm; the fourth layer is the low refractive index layer L2, with a thickness of 396nm; the fifth layer is the second high refractive index layer H3, with a thickness of 71nm; the sixth layer is the low refractive index layer L3, with a thickness of 163nm; the seventh layer is the second high refractive index layer H4, with a thickness of 62nm; the eighth layer is the low refractive index layer L4, with a thickness of 145nm; the ninth layer is the second high refractive index layer H5, with a thickness of 88nm; the tenth layer is the low refractive index layer L5, with a thickness of 121nm; and the eleventh layer is the first high refractive index layer H6, with a thickness of 86nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, H3 and L3 constitute the third stack, H4 and L4 constitute the fourth stack, and H5 and L5 constitute the fifth stack. The materials and thicknesses of each film layer are shown in Table 3 below:

[0106] Table 3 Composition of the optical film of Example 3

[0107]

[0108] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 0.4%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 90.9%.

[0109] Example 4

[0110] This embodiment provides an optical film with a total of 9 film layers, including four stacked layers and a first high refractive index layer, wherein the first high refractive index layer and the second high refractive index layer are both made of SiN x The refractive index is 2.05, and the low refractive index layer is made of SiO2 with a refractive index of 1.46. Starting from the inner surface of the automotive glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 58nm; the second layer is the low refractive index layer L1, with a thickness of 75nm; the third layer is the second high refractive index layer H2, with a thickness of 31nm; the fourth layer is the low refractive index layer L2, with a thickness of 425nm; the fifth layer is the second high refractive index layer H3, with a thickness of 71nm; the sixth layer is the low refractive index layer L3, with a thickness of 98nm; the seventh layer is the second high refractive index layer H4, with a thickness of 62nm; the eighth layer is the low refractive index layer L4, with a thickness of 122nm; and the ninth layer is the first high refractive index layer H5, with a thickness of 91nm. H1 and L1 constitute the first stacked layer, H2 and L2 constitute the second stacked layer, H3 and L3 constitute the third stacked layer, and H4 and L4 constitute the fourth stacked layer. The materials and thicknesses of each film layer are shown in Table 4 below:

[0111] Table 4 Composition of the optical film of Example 4

[0112]

[0113] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 0.9%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 90.2%.

[0114] Comparative Example 1

[0115] Comparative Example 1 provides an optical film with a total of 7 film layers, including three stacked layers and a first high refractive index layer, wherein the materials of the first high refractive index layer and the second high refractive index layer are both SiN x , the refractive index is 2.05, and the material of the low refractive index layer is SiO2, with a refractive index of 1.46. Starting from the inner surface of the automobile glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 85nm; the second layer is the low refractive index layer L1, with a thickness of 73nm; the third layer is the second high refractive index layer H2, with a thickness of 71nm; the fourth layer is the low refractive index layer L2, with a thickness of 366nm; the fifth layer is the second high refractive index layer H3, with a thickness of 51nm; the sixth layer is the low refractive index layer L3, with a thickness of 98nm; the seventh layer is the first high refractive index layer H4, with a thickness of 100nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, and H3 and L3 constitute the third stack. The materials and thicknesses of each film layer are shown in Table 5 below:

[0116] Table 5 Composition of the optical film of Comparative Example 1

[0117]

[0118] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 3.9%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 87.5%.

[0119] Comparative Example 2

[0120] Comparative Example 2 provides an optical film with a total of 13 film layers, including six stacked layers and a first high refractive index layer, wherein the materials of the first high refractive index layer and the second high refractive index layer are both ZnSe with a refractive index of 2.6, and the materials of the low refractive index layer are both SiO2 with a refractive index of 1.46. Starting from the inner surface of the automotive glass, the layers of the optical film are as follows: the first layer is the second high refractive index layer H1, with a thickness of 60nm; the second layer is the low refractive index layer L1, with a thickness of 70nm; the third layer is the second high refractive index layer H2, with a thickness of 99nm; the fourth layer is the low refractive index layer L2, with a thickness of 89nm; the fifth layer is the second high refractive index layer H3, with a thickness of 86nm; the sixth layer is the low refractive index layer L3, with a thickness of 85nm; the seventh layer is the second high refractive index layer H4, with a thickness of 128nm; the eighth layer is the low refractive index layer L4, with a thickness of 122nm; the ninth layer is the second high refractive index layer H5, with a thickness of 49nm; the tenth layer is the low refractive index layer L5, with a thickness of 456nm; the eleventh layer is the second high refractive index layer H6, with a thickness of 77nm; the twelfth layer is the low refractive index layer L6, with a thickness of 73nm; and the thirteenth layer is the first high refractive index layer H7, with a thickness of 69nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, H3 and L3 constitute the third stack, H4 and L4 constitute the fourth stack, H5 and L5 constitute the fifth stack, and H6 and L6 constitute the sixth stack. The materials and thicknesses of each film layer are shown in Table 6 below:

[0121] Table 6 Composition of the optical film of Comparative Example 2

[0122]

[0123] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 5.1%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 83.2%.

[0124] Comparative Example 3

[0125] Comparative Example 3 provides an optical film with a total of 12 film layers, including six stacked layers, wherein the material of the second high refractive index layer is ZnSe with a refractive index of 2.6, and the material of the low refractive index layers is SiO2 with a refractive index of 1.46. Starting from the inner surface of the automotive glass, the layers of the optical film are as follows: the first layer is the second highest refractive index layer H1, with a thickness of 88nm; the second layer is the low refractive index layer L1, with a thickness of 103nm; the third layer is the second highest refractive index layer H2, with a thickness of 76nm; the fourth layer is the low refractive index layer L2, with a thickness of 165nm; the fifth layer is the second highest refractive index layer H3, with a thickness of 84nm; the sixth layer is the low refractive index layer L3, with a thickness of 145nm; the seventh layer is the second highest refractive index layer H4, with a thickness of 53nm; the eighth layer is the low refractive index layer L4, with a thickness of 122nm; the ninth layer is the second highest refractive index layer H5, with a thickness of 49nm; the tenth layer is the low refractive index layer L5, with a thickness of 456nm; the eleventh layer is the second highest refractive index layer H6, with a thickness of 77nm; and the twelfth layer is the low refractive index layer L6, with a thickness of 73nm. Among them, H1 and L1 constitute the first stack, H2 and L2 constitute the second stack, H3 and L3 constitute the third stack, H4 and L4 constitute the fourth stack, H5 and L5 constitute the fifth stack, and H6 and L6 constitute the sixth stack. The materials and thicknesses of each film layer are shown in Table 7 below:

[0126] Table 7 Composition of the optical film of Comparative Example 3

[0127]

[0128] The optical transmittance TL of the optical film in the wavelength range of 380 nm to 780 nm is 2.9%, and the optical transmittance in the wavelength range of 920 nm to 980 nm is 86.4%.

[0129] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The embodiments described above only express several implementation methods of the present invention, which are convenient for understanding the technical solutions of the present invention in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all fall within the scope of protection of the present invention. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided by the present invention are all within the scope of protection of the claims attached to the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the content of the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. An optical film, characterized in that: The optical film includes at least four stacked layers and a first high refractive index layer: Each of the stacked layers comprises a second high refractive index layer and a low refractive index layer, and in at least four of the stacked layers, one layer of the low refractive index layer is stacked between every two adjacent layers of the second high refractive index layer, and one layer of the second high refractive index layer is stacked between every two adjacent layers of the low refractive index layer; The first high refractive index layer is in direct contact with the low refractive index layer in the adjacent stack; The refractive indexes of the first high refractive index layer and the second high refractive index layer are both ≥1.8, and the refractive index of the low refractive index layer is ≤1.7; The optical transmittance of the optical film in the wavelength range of 380nm~780nm is less than 1%, and the optical transmittance in the wavelength range of 920nm~980nm is greater than 85%. Among the multiple low refractive index layers, except for the thickest low refractive index layer, the thickness of the remaining low refractive index layers is independently 70nm~170nm.

2. The optical film according to claim 1, wherein In at least four of the stacked layers, in at least three of the stacked layers, the thickness D1 of the second high refractive index layer is ≤ the thickness D2 of the low refractive index layer.

3. The optical film according to claim 1, wherein In at least four of the stacked layers, in at least two of the stacked layers, the thickness D1×1.5 of the second high refractive index layer is less than the thickness D2 of the low refractive index layer.

4. The optical film according to claim 1, wherein The total thickness of the optical film is ≥1000 nm.

5. The optical film according to claim 4, wherein The total thickness of the first high refractive index layer and the plurality of second high refractive index layers is ≥300 nm; The total thickness of the plurality of low refractive index layers is ≥700 nm.

6. The optical film according to claim 1, wherein The thickness of the first high refractive index layer and the second high refractive index layer are both 30 nm to 100 nm.

7. The optical film according to claim 1, wherein Among the plurality of low-refractive index layers, the thickest low-refractive index layer has a thickness of ≥300 nm.

8. The optical film according to claim 1, wherein Among the plurality of low-refractive index layers, the thickest low-refractive index layer is disposed between the two stacked layers.

9. The optical film according to claim 1, wherein The optical transmittance of the optical film in the infrared band of 920nm~980nm is ≥90%.

10. The optical film according to claim 1, wherein In the optical film, the number of the stacked layers is ≤7.

11. The optical film according to claim 1, wherein The difference between the refractive index of the first high refractive index layer and the refractive index of the low refractive index layer is ≥0.3; and The difference between the refractive index of the second high refractive index layer and the refractive index of the low refractive index layer is ≥0.

3.

12. The optical film according to claim 1, wherein The materials of the first high refractive index layer and the second high refractive index layer include TiO x 、SiN x 、NbO x 、ZrO x , Si, ZnS and ZnSe, and the material of the low refractive index layer includes SiO x 、SiON、MF x 、AlO x and MgO x One or more of , wherein M is a metal element.

13. An automobile glass, characterized in that: The optical film comprises a glass substrate and an optical film, wherein the glass substrate has an outer surface and an inner surface relative to each other, the optical film is arranged on the inner surface, the glass substrate is provided with an information collection area, and the orthographic projection of the optical film on the inner surface completely covers the information collection area, and the optical film is the optical film according to any one of claims 1 to 12.

14. The automobile glass according to claim 13, characterized in that: In a direction away from the inner surface of the glass substrate, the first high refractive index layer is farthest from the inner surface of the glass substrate.

15. A vehicle, characterized in that: The automotive glass according to claim 14 is included.

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