CN213091919U - Coating protective cover - Google Patents
Coating protective cover Download PDFInfo
- Publication number
- CN213091919U CN213091919U CN202021883794.8U CN202021883794U CN213091919U CN 213091919 U CN213091919 U CN 213091919U CN 202021883794 U CN202021883794 U CN 202021883794U CN 213091919 U CN213091919 U CN 213091919U
- Authority
- CN
- China
- Prior art keywords
- refractive index
- film
- shield
- oxide
- film layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Laminated Bodies (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
The application provides a coating film protection casing, the coating film protection casing includes: a substrate and a first film system. The substrate has a first side and a second side opposite to each other, and has a light splitting characteristic allowing light in a wavelength range of 850nm to 1600nm to pass through; and the first film is disposed on at least one of the first side and the second side. The first film system comprises first low-refractive-index film layers with the refractive index smaller than 2.0 and first high-refractive-index film layers with the refractive index larger than 2.0 which are alternately plated so as to form the light splitting characteristic of antireflection in a visible light region and an infrared light region; and the first film has the property of absorbing visible light to form a black appearance.
Description
Technical Field
The application relates to the field of optical elements, in particular to a coated protective cover and a preparation method thereof.
Background
In systems such as automatic driving of vehicles, face recognition and the like, light rays in near-infrared wave bands are received by an image sensor at a laser window, and then a processor in the system performs image analysis and recognition according to light intensity information. Since the image sensor performs recognition and detection by receiving the intensity of the reflected light, the laser window needs to have a sufficiently high transmittance in the near infrared band; meanwhile, the internal structure of the system is complex, and the system is exposed to the outside and can be polluted by dust and the like, so that the using effect is influenced, and a protective cover and the like are required to be added for protection. The protective cover comprising the laser window can not only realize the functions, but also shield the interior of the system in appearance so as to ensure that the appearance of the system is beautiful and natural. When considering the color of the protective cover, whether the protective cover is suitable for the color of an applicable system such as various vehicles and the like needs to be considered, and the main color tone of the protective cover is considered to be the most suitable black, so that the beautiful and practical effect can be achieved.
The prior art coating product is realized by a plurality of layers of high-refractive-index and low-refractive-index media alternately deposited on a substrate in an interference mode. The high and low refractive index films are typically formed of different oxides, such as titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, silicon oxide, mixtures thereof, and the like, and can achieve a cut-off or low reflectivity in the visible region. However, the transmission amount and the reflection amount of the above conventional oxide film layer in the visible light region are complementary, and the spectral characteristics of low transmission and low reflection of visible light cannot be realized, and the spectra thereof are shown in fig. 4 and 5. Visible light can achieve the light splitting effect of low transmission and high reflection through the existing composite coating product as shown in fig. 4, and although the inside of a system is invisible, the reflected light can make the coating product look like a mirror surface; visible light can realize the light splitting effect of high transmission and low reflection through the other existing composite coating product as shown in figure 5, and the inside of a system using the composite coating product is visible, so that the use requirement of the application is not met. In addition, there is a system in which a glass having a low transmittance in the visible light region and a low reflection property is used as a shield, but since there is a component which is not friendly to environmental substances in the composition of the special glass, it is not allowed to use the special glass in practical use.
Therefore, there is a need for an environmentally friendly black protective cover, which has a laser window with spectral characteristics of high transmission in the near infrared region, low transmission in the visible region, and low reflection, and can be applied to systems for automatic driving of vehicles, face recognition, and the like.
SUMMERY OF THE UTILITY MODEL
The present application provides a protective cover and a method of making the same that addresses at least some of the above-identified shortcomings in the prior art.
One aspect of the present application provides a protective cover, including: a substrate having first and second opposite sides and having spectroscopic properties allowing light in a wavelength range of 850nm to 1600nm to pass therethrough; the first film system is arranged on at least one of the first side and the second side and comprises first low-refractive-index film layers with the refractive index smaller than 2.0 and first high-refractive-index film layers with the refractive index larger than 2.0 which are plated alternately so as to form the light splitting characteristic of antireflection in the visible light region and the infrared light region; and the first film has the property of absorbing visible light to form a black appearance.
According to an embodiment of the present application, under normal incidence, the first film system has an absorption band corresponding to an average transmittance of less than 1% in a wavelength range from 420nm to 700nm and an average reflectance of less than 5%, and a transmission band corresponding to an average transmittance of more than 95% in a wavelength range from 850nm to 1550 nm.
According to an embodiment of the present application, the first film system is disposed on the first side, and the protective cover further includes a second film system disposed on the second side, wherein the second film system includes a second low refractive index film layer with a refractive index less than 1.4, a second middle refractive index film layer with a refractive index between 1.4 and 2.0, and a second high refractive index film layer with a refractive index greater than 2.0, which are alternately plated, so as to form a light splitting characteristic of visible light region cut-off and infrared light region antireflection.
According to the embodiment of the application, the second film system is a red high-reflection film.
According to an embodiment of the present application, the second high refractive index film layer includes at least two high refractive index films composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide.
According to an embodiment of the present application, the second low refractive index film layer includes at least two low refractive index films composed of a mixture of one or more of alumina, magnesia, silica, magnesium fluoride, and cryolite.
According to an embodiment of the present application, the second middle refractive index film layer includes at least two middle refractive index films, and the middle refractive index films are composed of a mixture of one or more of aluminum oxide, magnesium oxide, silicon oxide, magnesium fluoride, and cryolite.
According to an embodiment of the present application, the substrate has a single-layer structure or a multi-layer structure.
According to an embodiment of the present application, the substrate is made of at least one of a glass material and a resin material.
According to an embodiment of the present application, the first high refractive index film layer includes at least two high refractive index films composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide.
According to an embodiment of the present application, the first low refractive index film layer includes at least two low refractive index films composed of a mixture of one or more of silicon oxide, magnesium fluoride, and cryolite.
According to an embodiment of the present application, the second side of the substrate has a light absorption characteristic corresponding to a visible light region to absorb the visible light region to form a black surface.
In another aspect, the present application also provides a method for manufacturing a shield cap, the method including: alternately plating a first low refractive index film layer having a refractive index of less than 2.0 and a first high refractive index film layer having a refractive index of more than 2.0 to form a first film system having spectral characteristics of antireflection in a visible light region and an infrared light region, forming a substrate having opposite first and second sides and having optical properties allowing passage of light in a wavelength range of 850nm to 1600 nm; and disposing the first film on at least one side of the substrate, wherein the first film absorbs visible light to form a black appearance.
According to an embodiment of the present application, the spectral characteristics of the first film system under normal incidence conditions are set to: has an absorption band corresponding to an average transmittance of less than 1% in a wavelength range of 420nm to 700nm and an average reflectance of less than 5%, and a transmission band corresponding to an average transmittance of more than 95% in a wavelength range of 850nm to 1550 nm.
According to an embodiment of the application, the method further comprises: alternately plating a second low-refractive-index film layer with the refractive index smaller than 1.4, a second medium-refractive-index film layer with the refractive index between 1.4 and 2.0 and a second high-refractive-index film layer with the refractive index larger than 2.0 to form a second film system; and
and arranging the second film system on the other side of the substrate opposite to the side on which the first film system is arranged, wherein the second film system has the light splitting characteristics of visible light region cut-off and infrared light region antireflection.
According to the embodiment of the application, the second film system is set to be a red high-reflection film.
According to an embodiment of the application, the method further comprises: and forming at least two high-refractive-index films by coating, wherein the high-refractive-index films are formed by one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide and silicon oxide.
According to an embodiment of the application, the method further comprises: and forming at least two low-refractive-index films into the second low-refractive-index film layer through film coating, wherein the low-refractive-index films are formed by one or a mixture of more of aluminum oxide, magnesium oxide, silicon oxide, magnesium fluoride and cryolite.
According to an embodiment of the application, the method further comprises: and forming at least two middle refractive index films by coating, wherein the middle refractive index film is formed by one or a mixture of more of aluminum oxide, magnesium oxide, silicon oxide, magnesium fluoride and cryolite.
According to an embodiment of the present application, the substrate is provided in a single layer structure or a multi-layer structure.
According to an embodiment of the present application, the substrate is made of at least one of a glass material and a resin material.
According to an embodiment of the application, the method further comprises: and forming at least two high-refractive-index films by coating, wherein the high-refractive-index films are formed by one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide and silicon oxide.
According to an embodiment of the application, the method further comprises: and forming at least two low-refractive-index films into the first low-refractive-index film layer through film coating, wherein the low-refractive-index films are formed by one or more of silicon oxide, magnesium fluoride and cryolite.
According to an embodiment of the application, the method further comprises: the second side of the substrate absorbs visible light to form a black surface.
According to at least one scheme of the protective cover provided by the application, at least one of the following beneficial effects can be achieved:
1. the present application provides a shield that can have a spectral characteristic of low transmission and low reflection in a wavelength range of at least 420nm to 700nm in a visible light region; and high transmission in the near infrared region including, but not limited to, the wavelength range of 850nm to 1550nm or a partial band of the near infrared region.
2. The application provides a protection casing, forms black outward appearance through absorbing visible light, reaches the effect of protecting and shielding system internal component.
3. The application provides a safety cover has the laser window, can guarantee that near-infrared region has higher transmissivity, has reduced the loss of light energy, has promoted the sensitivity of the detector such as laser radar.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of a coating mask according to one embodiment of the present application;
FIG. 2 is a graph of transmittance and reflectance versus wavelength for a coated protective cover according to one embodiment of the present application;
FIG. 3 is a schematic diagram of the working principle of a coating shield according to an embodiment of the present application;
FIG. 4 is a graph of transmittance and reflectance versus wavelength for a conventional coated protective cover;
FIG. 5 is a graph of transmittance and reflectance versus wavelength for another prior art protective coating; and
FIG. 6 is a flow chart of a method of making a coated protective cover according to one embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first side discussed below may also be referred to as the second side without departing from the teachings of the present application. And vice versa.
In the drawings, the thickness, size and shape of the components have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, unless explicitly defined or contradicted by context, the specific steps included in the imaging film set described in the present application are not necessarily limited to the described order, and may be performed in any order or in parallel. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural view of a plating protective cover 1000 according to an embodiment of the present application. As shown in fig. 1, a plating shield 1000 according to an embodiment of the present application includes a substrate 1100 and a first film train 1200.
In an embodiment of the present application, the substrate 1100 has a first side (not shown) and a second side (not shown) that are opposite. For example, the light incident surface can be regarded as the first side, and the light emergent surface can be regarded as the second side. The substrate 1100 may be a single layer or a multi-layer structure, and should have a transmission band corresponding to a wavelength range of 850nm to 1600 nm. Therefore, the substrate 1100 may be made of an optical material having a high transmittance in a range of 850nm to 1600nm in the laser window, for example, the substrate 1100 may be made of an optical material having a transmittance T greater than 90%. The optical material may be any one of or a combination of glass material and resin material, for example, a white board, a cyan board, colored glass, or various resin materials may be used, and the present application does not limit the present invention.
The first film train 1200 is disposed on a first surface of the substrate 1100. The first film system 1200 is a structure composed of a plurality of films. In this embodiment, the first film system 1200 includes first high refractive index film layers 1210 and first low refractive index film layers 1220 that are alternately plated. In this embodiment, the refractive index n of the first high refractive index film layer 1210 may satisfy n > 2.0, and the refractive index n of the first low refractive index film layer 1220 may satisfy n < 2.0. In the first film system 1200, the first high refractive index film layer 1210 may include at least two high refractive index films, and the high refractive index films may be composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide, which is not limited in this application. The first low refractive index film layer 1220 may include at least two low refractive index films, and the low refractive index films may be composed of a mixture of one or more of silicon oxide, magnesium fluoride, and cryolite, which is not limited in this application.
The first film system 1200 formed by alternately plating the first high refractive index film layers 1210 and the first low refractive index film layers 1220 has a light-splitting characteristic of antireflection in a visible light region and an infrared light region. Under normal incidence, the first film system 1200 has an absorption band corresponding to an average transmittance T < 1% in the wavelength range from 420nm to 700nm and an average reflectance R < 5%, and a transmission band corresponding to an average transmittance T > 95% in the wavelength range from 850nm to 1550 nm. Further, since the first film system 1200 also has a high absorptivity in the visible region, for example, absorptivity a > 94%, the first film system 1200 has a black appearance formed by absorbing visible light.
Referring again to fig. 1, in one embodiment of the present application, a second film train 1300 may also be disposed on the second surface of the substrate 1100. In this embodiment, the second film system 1300 includes a second high refractive index film layer 1310, a second middle refractive index film layer 1320, and a second low refractive index film layer 1330 that are alternately plated. In this embodiment, the refractive index n of the second high refractive index film 1310 satisfies n > 2.0, the refractive index n of the second middle refractive index film 1320 is between 1.4 and 2.0, and the refractive index n of the second low refractive index film 1330 satisfies n < 1.4. In the second film system 1300, the second high refractive index film 1310 may include at least two high refractive index films, and the high refractive index films may be composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide, which is not limited in this application. The second middle refractive index film layer 1320 may include at least two middle refractive index films, and the middle refractive index films may be composed of a mixture of one or more of aluminum oxide, magnesium oxide, silicon oxide, magnesium fluoride, and cryolite, which is not limited in this application. The second low refractive index film 1330 may include at least two low refractive index films, and the low refractive index films may be composed of a mixture of one or more of alumina, magnesia, silica, magnesium fluoride, and cryolite, which is not limited in this application.
The second film system 1300 formed by alternately plating the second high refractive index film layer 1310, the second middle refractive index film layer 1320 and the second low refractive index film layer 1330 has a light-splitting characteristic of cut-off in a visible light region and reflection reduction in an infrared light region. In addition, since the second film system 1300 can achieve a high reflectance in a red region of a visible light region, for example, the reflectance R reaches 95% or more, the second film system 1300 is also a red highly reflective film.
In this embodiment, the first film system 1200 and the second film system 1300 in combination can achieve an absorption band corresponding to an average transmittance T < 1% in the wavelength range of 420nm to 700nm and an average reflectance R < 5% under normal incidence conditions, and a transmission band corresponding to an average transmittance R > 95% in the wavelength range of 850nm to 1550 nm.
FIG. 2 is a graph of transmittance T and reflectance R versus wavelength for a coated protective cover 1000 according to one embodiment of the present application. As shown in fig. 2, the coating film shield 1000 formed by the combination of the first film system 1200 and the substrate 1100, or the coating film shield 1000 formed by the combination of the first film system 1200, the second film system 1300 and the substrate 1100 can realize spectral characteristics of low reflection and low transmission in the visible region and high transmission in the near infrared region. Specifically, the light splitting effect of the coated shield 1000 can include, but is not limited to, an average transmittance T < 1% in the wavelength range of 420nm to 700nm and an average reflectance R < 5% in the normal incidence of light, and an average transmittance T > 95% in the wavelength range of 850nm to 1550nm, such as 885nm, 905nm, 1064nm, and 1550 nm.
Meanwhile, the coating protective cover 1000 has a higher absorptivity corresponding to the wavelength range of 420nm to 700nm, for example, the absorptivity A is more than 94%, so the coating protective cover 1000 also has a black appearance formed by absorbing visible light. Specifically, obtaining a black appearance of the plating resist 1000 can be achieved in the following three ways.
In one embodiment of the present disclosure, the coating shield 1000 may be formed by combining the first film system 1200 and the substrate 1100 to have a high visible light absorption rate, and a black appearance formed by absorbing visible light may be realized.
Alternatively, in one embodiment of the present application, another substrate may be introduced into the structure of the film-coating protection cover 1000 including the first film system 1200 and the substrate 1100, and the absorption of visible light and the formation of black appearance are achieved after the composition by means of gluing, for example.
Alternatively, in one embodiment of the present application, the second side (the surface on which the first film system is not disposed) of the substrate 1100 may be designed to correspond to a high light absorption characteristic in the visible light region, for example, the visible light absorption rate a of the second side is greater than 94%, so as to absorb the visible light region to form a black surface.
Fig. 3 is a schematic diagram of the working principle of a coating shield 1000 according to an embodiment of the present application.
After the film-coated protective cover 1000 according to an embodiment of the present disclosure is installed in a system such as automatic driving of a vehicle, human face recognition, etc., as shown in fig. 3, when light passes through the film-coated protective cover 1000, since the first film system 1200, the second film system 1300, and the substrate 1100 that make up the film-coated protective cover 1000 all have high spectral characteristics of infrared region antireflection (high transmittance), such as the average transmittance T > 95% of the film-coated protective cover 1000, infrared light 3000 enters the film-coated protective cover 1000, and then enters the first film system 1200, the substrate 1100, and the second film system 1300 in sequence to be received by the image sensor in the above system, and then the processor in the system performs image analysis and recognition according to the light intensity information. In contrast, since the first film system 1200 and the second film system 1300 which form the coating shield 1000 have spectral characteristics of antireflection and high absorption in the visible region and spectral characteristics of cut-off in the visible region, for example, the first film system 1200 may have spectral characteristics corresponding to an average transmittance T of less than 1% and an average reflectance R of less than 5% in a wavelength range of 420nm to 700nm, after entering the coating shield 1000, the visible light 4000 is sequentially absorbed by the first film system 1200 to form a black appearance, and at the same time, the second film system 1300 assists in cutting off the visible light 4000, so that the visible light 4000 cannot enter the inside of the system.
FIG. 6 is a flow chart of a method 2000 of making a coated protective cover 1000 according to one embodiment of the present application. In one embodiment of the present application, a method 2000 of making a protective cover for a plating film is also provided, as shown in fig. 6. The method 2000 mainly comprises:
s1, alternately plating the first low refractive index film layer and the first high refractive index film layer to form a first film system.
In step S1, the refractive index n of the first high refractive index film layer is greater than 2.0, and the refractive index n of the first low refractive index film layer is less than 2.0. In one embodiment of the present application, the first high refractive index film layer may be made of at least two high refractive index films, and the high refractive index film may be composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide, which is not limited in this application. The first low refractive index film layer may be made of at least two low refractive index films, and the low refractive index film may be composed of a mixture of one or more of silicon oxide, magnesium fluoride, and cryolite, which is not limited in this application. The first film system can be formed by alternately plating the first low refractive index film layer and the first high refractive index film layer, has the light-splitting characteristic of infrared region antireflection and the light-splitting characteristic of visible region antireflection and high absorption, and absorbs visible light to form a black appearance.
S2, preparing a substrate having a transmission band corresponding to a wavelength range of 850nm to 1600 nm.
In step S2, an optical material with high transmittance in the range of 850nm to 1600nm in the laser window, for example, an optical material with transmittance T > 90% may be selected to fabricate the substrate. Specifically, the optical material may be any one of or a combination of glass material and resin material, for example, a white board, a cyan board, colored glass, or various resin materials may be used, and the present application is not limited thereto. The substrate may be provided in a single layer or a multi-layer structure.
The substrate may have opposing first (not shown) and second sides (not shown). For example, the light incident surface may be provided as a first side and the light emitting surface may be provided as a second side.
Alternatively, in one embodiment of the present application, the second side of the substrate (the surface on which the first film system is not disposed) may be further configured to have a high light absorption characteristic corresponding to a visible light region, for example, a visible light absorption rate a > 94% of the second side, to absorb the visible light region to form a black surface.
S3, the first film is disposed on the first side of the substrate.
In step S3, a first film system is disposed on the first side of the substrate to form a plating mask, and the spectral characteristics of the first film system are set as follows: under normal incidence, it may have an absorption band corresponding to an average transmittance of less than 1% in the wavelength range from 420nm to 700nm and an average reflectance of less than 5%, and a transmission band corresponding to an average transmittance of more than 95% in the wavelength range from 850nm to 1550 nm.
Further, in one embodiment of the present application, the method 2000 of preparing the plating protective cover 1000 further comprises: alternately plating a second low refractive index film layer, a second middle refractive index film layer and a second high refractive index film layer to form a second film system; and disposing a second film on a second side of the substrate opposite the first side.
In this embodiment, the second film system 1300 may be composed of a second high refractive index film layer, a second middle refractive index film layer, and a second low refractive index film layer, which are alternately plated. In this embodiment, the refractive index of the second high refractive index film layer 1310 is greater than 2.0, the refractive index of the second middle refractive index film layer 1320 is in a range of 1.4-2.0, and the refractive index of the second low refractive index film layer is less than 1.4. In the second film system, the second high refractive index film layer may be made of at least two high refractive index films, and the high refractive index film may be composed of a mixture of one or more of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide, which is not limited in this application. The second intermediate refractive index film layer may be made of at least two intermediate refractive index films, and the intermediate refractive index film may be composed of a mixture of one or more of alumina, magnesia, silica, magnesium fluoride, and cryolite, which is not limited in this application. The second low refractive index film layer may be made of at least two low refractive index films, and the low refractive index film may be composed of a mixture of one or more of alumina, magnesia, silica, magnesium fluoride, and cryolite, which is not limited in this application.
The second film system composed of the second high refractive index film layer, the second middle refractive index film layer, and the second low refractive index film layer 1330 has the spectral characteristics of cut in the visible light region and antireflection in the infrared light region. Also, since the second film system 1300 may be configured to achieve a high reflectance in a red region of a visible region, for example, a reflectance of more than 95%, the second film system is also a red highly reflective film.
In one embodiment of the present application, disposing a first film system on a first side of a substrate and a second film system on a second side of the substrate to form a plating resist, the spectral characteristics of the first film system or the combination of the first film system and the second film system may be set to: under normal incidence, the material has an absorption band corresponding to an average transmittance of less than 1% in a wavelength range from 420nm to 700nm and an average reflectance of less than 5%, and a transmission band corresponding to an average transmittance of more than 95% in a wavelength range from 850nm to 1550 nm.
The above description is only an embodiment of the present application and an illustration of the technical principles applied. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (12)
1. A protective cover, comprising:
a substrate having first and second opposite sides and having spectroscopic properties allowing light in a wavelength range of 850nm to 1600nm to pass therethrough; and
a first film system disposed on at least one of the first side and the second side,
wherein the first film system includes first low refractive index film layers having a refractive index of less than 2.0 and first high refractive index film layers having a refractive index of more than 2.0, which are alternately plated, to form a light splitting characteristic of antireflection in a visible light region and an infrared light region, and the first film system has a property of absorbing visible light to form a black appearance.
2. The shield of claim 1 wherein the first film has an absorption band corresponding to an average transmittance of less than 1% over a wavelength range of 420nm to 700nm and an average reflectance of less than 5% under normal incidence conditions, and a transmission band corresponding to an average transmittance of greater than 95% over a wavelength range of 850nm to 1550 nm.
3. The shield cap of claim 1 or 2, wherein the first film is disposed on the first side, and the shield cap further comprises a second film system disposed on the second side, wherein the second film system comprises a second low refractive index film layer with a refractive index less than 1.4, a second middle refractive index film layer with a refractive index between 1.4 and 2.0, and a second high refractive index film layer with a refractive index greater than 2.0, which are alternately plated to have light-splitting characteristics of visible light cut-off and infrared light reflection reduction.
4. The shield of claim 3 wherein the second film is a red high reflectance film.
5. The shield of claim 3, wherein the second high index film layer comprises at least two high index films, the high index films being one of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide.
6. The shield of claim 3, wherein the second low index film layer comprises at least two low index films, the low index films being one of alumina, magnesia, silica, magnesium fluoride, and cryolite.
7. The shield of claim 3, wherein the second intermediate index film layer comprises at least two intermediate index films, the intermediate index films being one of aluminum oxide, magnesium oxide, silicon oxide, magnesium fluoride, and cryolite.
8. The shield of claim 1, wherein the substrate has a single-layer structure or a multi-layer structure.
9. The shield of claim 1, wherein the substrate is one of a glass material and a resin material.
10. The shield of claim 1, wherein the first high index film layer comprises at least two high index films, the high index films being one of titanium oxide, niobium oxide, tantalum oxide, lanthanum oxide, and silicon oxide.
11. The shield of claim 1, wherein the first low index film layer comprises at least two low index films, the low index films being one of silicon oxide, magnesium fluoride, and cryolite.
12. The shield of claim 1, wherein the second side of the substrate has light absorption properties corresponding to the visible region to absorb visible region to form a black surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021883794.8U CN213091919U (en) | 2020-09-02 | 2020-09-02 | Coating protective cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021883794.8U CN213091919U (en) | 2020-09-02 | 2020-09-02 | Coating protective cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213091919U true CN213091919U (en) | 2021-04-30 |
Family
ID=75633391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021883794.8U Expired - Fee Related CN213091919U (en) | 2020-09-02 | 2020-09-02 | Coating protective cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213091919U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856624A (en) * | 2020-09-02 | 2020-10-30 | 信阳舜宇光学有限公司 | Coating protective cover and preparation method thereof |
| CN113820775A (en) * | 2021-10-20 | 2021-12-21 | 信阳舜宇光学有限公司 | Optical filter and preparation method thereof |
-
2020
- 2020-09-02 CN CN202021883794.8U patent/CN213091919U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856624A (en) * | 2020-09-02 | 2020-10-30 | 信阳舜宇光学有限公司 | Coating protective cover and preparation method thereof |
| CN113820775A (en) * | 2021-10-20 | 2021-12-21 | 信阳舜宇光学有限公司 | Optical filter and preparation method thereof |
| WO2023065627A1 (en) * | 2021-10-20 | 2023-04-27 | 信阳舜宇光学有限公司 | Optical filter and manufacturing method therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7569827B2 (en) | Optical Filters | |
| US5521759A (en) | Optical filters for suppressing unwanted reflections | |
| KR101764084B1 (en) | Near-infrared cut filter and solid-state imaging device | |
| CN112888971B (en) | Transparent covering with anti-reflection coating | |
| JP2509922B2 (en) | Multi-layered surface reflector | |
| KR102061477B1 (en) | Near-infrared cut-off filter | |
| US6997981B1 (en) | Thermal control interface coatings and pigments | |
| CN213091919U (en) | Coating protective cover | |
| CN109863434B (en) | Device for optical window masking | |
| CN103675970A (en) | Infrared cut filter and imaging apparatus | |
| JPH0529082B2 (en) | ||
| CN102216817B (en) | Variable transmission composite interference filter | |
| CA2097811A1 (en) | Optical interference coating comprising interleaved thin-film stacks | |
| KR20190014531A (en) | Camera structure, imaging device | |
| WO2020004641A1 (en) | Optical filter and information acquisition device | |
| CN114942483A (en) | Glass assembly and vehicle | |
| CA3028791A1 (en) | Angle of incidence restriction for optical filters | |
| KR20250067175A (en) | Car window glass and its manufacturing method, vehicle | |
| CN115139593A (en) | Vehicle window glass and vehicle | |
| KR20250067168A (en) | Car window glass and its manufacturing method, vehicle | |
| CN111856624A (en) | Coating protective cover and preparation method thereof | |
| CN112477558A (en) | Coating film for windshield | |
| KR102406864B1 (en) | Optical structure including optical multilayer film and manufacturing method thereof | |
| JP7276406B2 (en) | Near-infrared sensor cover | |
| JPH05241017A (en) | Optical interference multilayered film having yellow filter function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210430 |