202 results about "Ir reflection" patented technology

The invention discloses a hot-pressing control method and system for a flexible circuit board, and particularly relates to the technical field of flexible electronic manufacturing process control, and the method comprises the following steps: calculating a heat conduction equilibrium coefficient through collecting the temperature and heat flux density data of each region in the flexible circuit board, and achieving the real-time evaluation of a heat diffusion characteristic; in combination with an infrared scanning mode, acquiring reflectivity data, analyzing dynamic change of the reflectivity data along with time, and identifying an abnormal region in which coating residues possibly exist; further comparing the position relationship between the thermal diffusion anomaly and the infrared reflection anomaly, screening a space overlapping region as a high-risk point, and executing a preset regulation and control strategy; according to the method, the heat conduction equilibrium coefficient is calculated by collecting heat flow and temperature data, the coating residue abnormal area is recognized by combining infrared reflectivity time sequence characteristics, the high-risk area is screened based on the space overlap ratio for dynamic regulation and control, accurate recognition, differential control and closed-loop optimization of hot pressing defects are achieved, and the hot pressing quality and consistency are improved.

The invention relates to the technical field of building energy-saving intelligent windows, and discloses a sunlight and heat radiation multi-adjustment intelligent window and a preparation method and application thereof. The intelligent window comprises an outer surface layer, a middle layer and an inner surface layer which are stacked in sequence. The outer surface layer comprises an infrared transparent layer, and an infrared reflecting layer and a doped vanadium dioxide layer which are respectively arranged on two opposite surfaces of the infrared transparent layer; the inner surface layer comprises a transparent substrate and a conductive layer attached to the surface of one side of the transparent substrate; the middle layer is a liquid crystal / polymer dimming layer, one side of the liquid crystal / polymer dimming layer is bonded with the infrared reflecting layer, and the other side of the liquid crystal / polymer dimming layer is bonded with the conductive layer. According to the intelligent window, multiple cooperative regulation and control of sunlight and heat radiation can be achieved, the regulation and control wave band is wide, the response speed is high, and the energy-saving effect is good. The regulation and control wave band covers visible light, near infrared and middle and far infrared ranges, reversible change can be realized along with the change of environment temperature, and all-year-round and all-weather energy saving is realized.

The invention provides a cold heading cutting forming mechanism and a using method, and belongs to the technical field of cold heading machining. Comprising a forming mechanism body, a forming cavity is formed in the inner side of the front portion of the upper end of the forming mechanism body, a cold heading cutter is arranged on the right side of the forming cavity, a protective mounting module is arranged at the upper end of the cold heading cutter, and a control panel is arranged above the right end of the protective mounting module. Through cooperation of the infrared emitter and the infrared reflecting mirror, the cross block and the cold heading cutter holder are adjusted to be perpendicular to each other according to the action of infrared reflection, and then when a metal wire is cut, once the cutting angle of the cold heading cutter deviates due to abrasion or other factors, the cross block and the cold heading cutter holder can be adjusted to be perpendicular to each other. When the metal wire is processed, the infrared emitter and the infrared reflecting mirror deviate, at the moment, the programmable logic controller receives a signal and transmits the signal to the control panel, and the cold heading cutter is powered off in time, so that the cold heading cutter is protected, and the safety of the metal wire during processing can be improved.

This invention relates to an inorganic composite photonic coating and its applications. The inorganic composite photonic coating of this invention includes a radiation-cooling functional coating or an infrared-reflecting functional coating, or a composite coating including the radiation-cooling functional coating and the infrared-reflecting functional coating arranged from top to bottom. The inorganic composite photonic coating of this invention can perform radiation cooling, infrared reflection blocking and heat preservation, or both, thereby achieving a self-adaptive effect of cooling in summer and blocking and insulating in winter.

The invention discloses an intelligent cooling coating with a multi-layer functional gradient structure and a preparation method of the intelligent cooling coating. The coating comprises an infrared reflection-heat conduction blocking bottom layer, a heat insulation middle layer and an anti-pollution high-reflection surface layer. Each layer comprises the following components: hollow glass beads, aerogel powder and a water-based acrylic emulsion, and is used for constructing the low-heat-conductivity and infrared-reflection bottom layer; the metal organic framework material, the polyurethane emulsion, the coupling agent and the dispersing agent are used for constructing a heat-insulation slow-release middle layer; the reflective heat-insulation rare earth powder, the fluorosilicone modified acrylic resin, the flatting agent and the dispersing agent are used for constructing a high-reflection self-cleaning structure of the surface layer. Three-layer step-by-step construction, sequential coating and layered thermocuring are adopted for preparation. The coating is environment-friendly and stable in structure, has the properties of infrared reflection, self-cleaning, thermal buffering and the like, can be used for effectively cooling and improving weather resistance and corrosion resistance, is suitable for high-temperature protection of building outer walls, roofs, storage and transportation equipment and the like, and has a wide application prospect.

The invention relates to an up-conversion infrared photon contact lens as well as a preparation method and application thereof, and belongs to an infrared visual material. Wrapping the surface of the solid nanometer microsphere with the up-conversion nanometer particles to form an up-conversion luminescence core-shell structure microsphere; dispersing the up-conversion core-shell structure microspheres in an acrylate solution to prepare an up-conversion luminescent layer (UCL); dispersing polymer microspheres in an acrylate solution to prepare an up-conversion light reflecting layer (GRL); dispersing the solid nano-microspheres in an acrylate solution to prepare an infrared reflection layer (IRL); dispersing the hollow nano-microspheres in an acrylate solution to prepare a surface antireflection layer (ARL); and further obtaining the up-conversion infrared photon contact lens. The contact lens prepared by the invention has excellent up-conversion luminescence performance and a good wearing function, and can realize efficient utilization of infrared photons so as to realize visualization of infrared light.

The present application provides a kind of vehicle laminated glass and its application, which includes outer sheet glass, inner sheet glass and intermediate film, the outer sheet glass has the first surface towards outside and the second surface towards inside, the inner sheet glass has the third surface towards outside and the fourth surface towards inside, the intermediate film is bonded with the second surface and the third surface, infrared reflection film is provided between the outer sheet glass and the inner sheet glass, and low-emissivity film is provided on the fourth surface;The mirror factor α of the vehicle laminated glass is less than or equal to 15, and the mirror factor α is according to the formula α=RL / TL 2 RL is the visible light reflectance of the vehicle laminated glass measured from the inside, and TL is the visible light transmittance of the vehicle laminated glass. When the vehicle laminated glass is used as the sunroof glass of the vehicle roof, the use of sunshade curtain can be cancelled, the mirror reflection effect of the inside can be effectively improved, and the user experience and passenger privacy can be protected.

The invention provides a technical photographing system for calligraphy and painting cultural relics, and relates to the technical field of photographing and repairing of the calligraphy and painting cultural relics, and the system comprises an automatic light source adjustment unit which comprises a light source recognition module and a light source optimization module, and the light source recognition module is used for recognizing physical feature parameters of the calligraphy and painting cultural relics and optimizing the light source parameters of the calligraphy and painting cultural relics; the physical characteristic parameters comprise materials, sizes and surface characteristics of the calligraphy and painting cultural relics. According to the photographing system for the calligraphy, painting and cultural relic technology, a multi-spectral image sequence is cooperatively collected by combining multiple light sources, detailed data including an ultraviolet fluorescence image, an infrared reflection image, a light-transmitting image and a sidelight texture image can be obtained, and the light sources in the lamp set are automatically selected and combined; therefore, precise illumination adjustment for different types of calligraphy and painting cultural relics is realized, the acquisition quality of the multispectral image sequence is ensured, and the accuracy and definition of the image are improved.

The application provides a kind of laminated glass and vehicle, can ensure that the appearance color difference of laminated glass is smaller under different observation angles, ensure the consistency of the overall appearance color of vehicle.Laminated glass includes outer sheet glass, inner sheet glass, infrared reflection layer and adhesive layer, adhesive layer is arranged between outer sheet glass and inner sheet glass, outer sheet glass includes oppositely arranged first surface and second surface, inner sheet glass includes oppositely arranged third surface and fourth surface, third surface faces second surface, infrared reflection layer is arranged on second surface;Laminated glass has the maximum chromatic aberration C max ≤3.5 in the range of incident angle θ 10°≤θ≤80°.

The invention relates to the technical field of leather products, and particularly discloses a leather product feature recognition and authentication method and system based on deep neural network learning. According to the scheme, visible light, near-infrared reflection and polarized light interference images of leather are obtained through a multi-mode imaging technology, surface texture and color, internal fiber structure and section fiber arrangement features are extracted respectively and converted into standardized feature vectors, the three types of features are fused to construct a comprehensive leather feature vector, and the comprehensive leather feature vector is obtained. A deep neural network is input for authenticity identification, a confidence score is output, objective quantification of full-dimensional physical characteristics from the surface to the interior is realized by outputting the confidence score, subjectivity and one-sidedness of traditional artificial identification are overcome, and the method has efficient and large-scale accurate identification capability.

The invention provides an intelligent two-dimensional code scanning method and system based on multi-modal perception, relates to the technical field of two-dimensional code scanning, and solves the technical problem of low recognition efficiency in a complex scene in the prior art. The method comprises the following steps: collecting a visual image, a depth image, an infrared reflection intensity graph and radar point cloud data of a to-be-scanned object to obtain multi-dimensional data; performing feature extraction on the multi-dimensional data to obtain multi-dimensional features; the multi-dimensional features are input into a Dempster Shafer evidence theory fusion device, and credibility is output; and deciding the scanning mode of the to-be-scanned object based on the credibility. The method can be applied to industrial production, logistics storage and other processes with high scanning precision requirements.

The application discloses an infrared sensing module, which comprises a reflecting part, a driving part, an infrared light emitter and an infrared light receiver, the driving part is connected with the reflecting part, the driving part drives the reflecting part to rotate, and in the case that the reflecting part rotates to a preset position, an infrared reflecting layer of the reflecting part faces the infrared light emitter and the infrared light receiver. The above scheme can solve the problem that the thickness of a terminal device is large due to the fact that infrared sensors are arranged on both sides of the terminal device. The application discloses a terminal device, a control method of a terminal device, a control device for controlling a terminal device and a computer readable storage medium.

The invention relates to the technical field of automobile glass surface treatment, in particular to heat management coated glass and a preparation method thereof, and the heat management coated glass is prepared by compounding two pieces of composite glass through an adhesive film; the composite glass sequentially comprises a glass substrate, an ultraviolet absorption functional layer and an infrared reflection functional layer, the preparation raw materials of the ultraviolet absorption functional layer at least comprise a SiO2 sol matrix and an inorganic ultraviolet absorbent; the preparation raw materials of the infrared reflection functional layer at least comprise tetraethoxysilane, acetylacetone, hydrochloric acid and antimony-doped tin oxide nanoparticles. The surface of the glass is coated with the optimized ultraviolet absorption functional layer and the infrared reflection functional layer, so that the barrier rate to ultraviolet (UV) of 99% or above and the reflectivity to infrared (IR) of 80-90% are achieved, and meanwhile, the glass has the characteristics of low cost and high weather resistance.

The invention relates to the technical field of infrared camouflage coatings, in particular to a single-component sea gray water-based camouflage coating and a preparation method thereof. The invention discloses a single-component sea gray water-based camouflage coating and a preparation method thereof, a white pigment of the camouflage coating uses infrared reflection titanium dioxide to replace part of conventional titanium dioxide, so that not only is the color displayed in a visible light region ensured, but also the reflectivity to sunlight in the visible light region and a near-infrared light region is improved; and the thermal radiation energy can be controlled from the temperature, so that the infrared emissivity is reduced. The inorganic pigment paste with different components and concentrations is used for toning, so that the coating can better adapt to the requirement of rich colors in different environments, not only has excellent aesthetic feeling in appearance, but also can meet the requirement of visible light camouflage compatibility visually.

An optical device, including a first selective light modulator layer comprising infrared transparent particles; and at least one infrared reflective material chosen from an infrared reflective layer and a plurality of infrared reflective particles is disclosed. A method of making the optical device is also disclosed.

A double coating structure based on a multifunctional water-based low-temperature paint, and a coating system and the use thereof. The double coating structure comprises a first coating and a second coating, wherein the first coating comprises a mixture of a flaky metallic pigment and an inorganic oxide pigment; the second coating comprises a transparent organic color paste; and a first-coating paint composition used for the first coating and a second-coating paint composition used for the second coating are both mixtures containing an acrylic resin emulsion and a polyurethane dispersion. The double coating structure uses the technical solution of a pigment mixture and does not contain any curing agent such as an isocyanate; the obtained double coating structure has high radar wave transmission performance, high infrared reflection performance and high reflective insulation capacity, and is particularly suitable for black or silver paint systems; and since a water-based low-temperature paint is used, the double coating structure has the characteristics of significant low-temperature quick-drying film formation, a thin coating and a low VOC content, and can realize a coating process that has low energy consumption and is healthy and environmentally friendly.

The application discloses a PVC / PMMA material, which comprises the following components in parts by weight: first PVC 78-92 parts; second PVC 5-15 parts; PMMA 25-40 parts; infrared reflection material 10-20 parts; stabilizer 0.5-3 parts; compatible agent 2-5 parts; and polytetrafluoroethylene 0.5-2.5 parts. The polymerization degree of the first PVC ranges from 900 to 1500, and the polymerization degree of the second PVC ranges from 400 to 700. The PVC / PMMA material is suitable for preparing automobile interior decoration.

The invention provides a multispectral image fusion method and system for security monitoring, and the method comprises the steps: carrying out the Retinex decomposition based on an obtained visible light image and an infrared image, and obtaining a visible light reflection component, a visible light illumination component, an infrared reflection component and an infrared illumination component; initial division of semantic regions is carried out based on the visible light reflection component and the infrared reflection component, and a joint semantic graph containing a plurality of semantic regions is obtained; based on the joint semantic graph, respectively carrying out regional adaptive smoothing constraint on the visible light illuminance component and the infrared illuminance component to obtain a visible light target smoothing component and an infrared target smoothing component; and performing illumination field alignment fusion on the visible light target smooth component and the infrared target smooth component based on the joint semantic map to obtain a fused illumination component. According to the method, the problems of edge blurring, artifact interference and key target structure distortion caused by uniform processing and ignoring of physical characteristic differences of semantic regions in an existing method are accurately solved.

The invention relates to the technical field of photovoltaics, in particular to a transparent reflective adhesive film, a preparation method thereof and a photovoltaic module. The transparent reflection type adhesive film comprises a first reflection layer, a second reflection layer and a bonding layer, the first reflecting layer comprises EVA resin, EAA resin, EMA resin, infrared reflecting master batch and full-spectrum master batch; the second reflecting layer comprises EVA resin, EAA resin, EMA resin, infrared reflecting master batch and high-refraction master batch; the bonding layer comprises EVA resin, PVOH resin, EVOH resin, POP resin, POE resin and high-bonding master batch. The transparent reflection type adhesive film can utilize full-band light rays to the maximum extent in the assembly packaging and using process, the power of an assembly is effectively improved, meanwhile, the assembly is endowed with good heat dissipation performance and weather resistance, and therefore the service life of the assembly is prolonged, and the operation reliability of the assembly is improved.

The present disclosure provides an energy collection heat insulation composite film, a preparation method thereof, and heat insulation glass. The energy collection heat insulation composite film comprises a heat insulation layer, an infrared reflection film, a thermoelectric conversion layer, and an ultraviolet absorption film. The infrared reflection film is arranged on the heat insulation layer, the thermoelectric conversion layer is arranged on the side of the infrared reflection film away from the heat insulation layer, and the ultraviolet absorption film is arranged on the side of the thermoelectric conversion layer away from the infrared reflection film. The material of the infrared reflection film comprises a material capable of reflecting infrared rays. The material of the ultraviolet absorption film comprises a material capable of absorbing ultraviolet rays. The energy collection heat insulation composite film can not only consume heat to avoid long-term accumulation of heat in the energy collection heat insulation composite film, but also realize recycling of heat energy.

The invention discloses a deep and long tunnel water inrush early warning and disposal method, and relates to the technical field of deep and long tunnel water inrush construction.The deep and long tunnel water inrush early warning and disposal method comprises the steps that infrared water detection equipment is arranged on the tunnel face and the side wall of a tunnel, infrared reflection signals are transmitted and received, and the position, the water content and the flow direction of underground water are recognized; generating underground water distribution data; the data is compared with a preset risk threshold value, when the underground water pressure is larger than or equal to 1.5 MPa or the water content is larger than or equal to 30%, it is judged that the area is a high-risk area, and the area is marked with a red flickering icon in a three-dimensional visual interface; a drainage hole is drilled in the high-risk area, a PVC drainage pipe with a filter screen is arranged in the drainage hole, and underground water is drained to the water collecting well; then a concrete reinforcing layer is sprayed around the drainage holes; and monitoring the pressure of the underground water after drainage in real time, and if the pressure is not reduced to 1.0 MPa or below, densifying the drainage hole and thickening the reinforcing layer to realize accurate early warning and rapid disposal of the water inrush risk.

The utility model relates to the technical field of obstacle detection, and discloses an obstacle detection device and system. The obstacle detection device comprises an infrared receiving and transmitting device, an infrared receiving device and a controller. The infrared transceiver is configured to emit an infrared detection signal to a detection space and receive an infrared reflection signal and / or an ambient light signal existing in the detection space; the infrared receiving device is configured to receive an ambient light signal existing in the detection space; and the control module is configured to calculate a signal difference value between the optical signals received by the infrared receiving and transmitting device and the infrared receiving device and obtain a corresponding obstacle detection result according to the signal difference value. According to the embodiment of the invention, the obstacle detection precision based on infrared sensing can be improved.

The invention discloses a high-temperature stable spectrum selective infrared film and a preparation method thereof, and belongs to the technical field of infrared functional materials. The thin film adopts a Fabry-Perot cavity multi-layer structure and sequentially comprises a bottom infrared reflecting layer, a top infrared reflecting layer, a top infrared reflecting layer, a bottom infrared reflecting layer and a top infrared reflecting layer from bottom to top, the intermediate dielectric resonance layer is prepared from an infrared transparent semiconductor material; the upper-layer part absorption layer is a metal thin film; the top packaging protection layer is made of an infrared transparent dielectric material; wherein the intermediate medium resonance layer is of a crystalline structure formed through thermal pretreatment, and the crystalline structure fundamentally inhibits interdiffusion of elements between film layers and structural phase change at high temperature; through the design, the thin film has low emissivity in atmospheric window wave bands of 3-5 microns and 8-14 microns, has high emissivity in a non-detection wave band of 5-8 microns, and can be used at the temperature of 600 DEG C for a long time.

The utility model provides a protective Low-E glass structure with an optical filter, which comprises an outer frame, a first Palm plate layer, a metal protective frame and a Low-E glass base layer are sequentially arranged in the outer frame, a plurality of hollow parts are formed on the metal protective frame from top to bottom, and a second Palm plate layer is fixedly arranged in each hollow part; a decorative filter sheet layer and an infrared reflecting film layer are sequentially arranged on one side surface, close to the Low-E glass base layer, of each second Pall plate layer; a low-dispersion layer is arranged on one side surface, close to the metal protection frame, of the second Palm plate layer; an ultraviolet protection layer and a first PVB film layer are sequentially arranged on the side face, close to the metal protection frame, of the first Palm plate layer, and an antireflection film layer is arranged on the side face, away from the metal protection frame, of the first Palm plate layer. A first anti-oxidation film layer, a sound insulation film layer, a second PVB film layer and a hydrophobic SiO2 film layer are sequentially arranged on one side surface, close to the metal protection frame, of the Low-E glass base layer. Good decoration and protection functions are realized.

The invention provides low-emissivity coated glass, a preparation method thereof, double-cavity hollow glass and application. The invention discloses low-emissivity coated glass. A glass substrate; the low-radiation film comprises a first dielectric layer, a middle layer, a second dielectric layer, an infrared reflection layer, a composite protection layer, a third dielectric layer and a protection layer which are stacked in the direction away from the glass substrate; the composite protection layer comprises a first protection layer, a second protection layer, a third protection layer and a fourth protection layer which are arranged in a stacked mode in the direction away from the infrared reflection layer. The low-emissivity coated glass has good tempering performance and heat resistance, the surface of the low-emissivity film is smoother and more compact, the hardness and oxidation resistance are excellent, and good high-transparency, heat-preservation and heat-resistant effects are shown. According to the double-cavity hollow glass prepared on the basis, the visible light transmittance is larger than or equal to 60%, the U value is smaller than or equal to 0.8, the building shading coefficient SC is larger than or equal to 0.60, and the requirement for ultralow energy consumption is met.

The invention relates to the technical field of quartz glass processing, in particular to a method for preparing a gold infrared reflecting layer on a quartz glass product, which comprises the following steps: S1, cleaning: cleaning the quartz glass product; s2, pre-treating: pre-treating the cleaned quartz glass product in a hydrofluoric acid solution for a certain time, and washing the quartz glass product after the pre-treatment is finished; s3, coating: uniformly coating the surface of the quartz glass product with the prepared gold coating, and drying to form a gold infrared reflecting layer on the surface of the quartz glass product; and S4, performing high-temperature heat treatment, namely performing high-temperature heat treatment on the dried quartz glass product at 950-1100 DEG C in an atmospheric environment. By optimizing the pretreatment process, the coating formula and the heat treatment process, the defects in the prior art are effectively overcome, high infrared reflectivity, strong binding force and excellent corrosion resistance are considered, metal impurity pollution is avoided, the process is simple and efficient, and the coating has wide application prospects in the high-end fields of semiconductors, aerospace and the like.

The invention discloses a method for nondestructively distinguishing kaolinite minerals based on an infrared reflection method, and belongs to the technical field of gemstone detection. According to the method, the classification standard of the kaolinite minerals is formulated according to the wave number difference between a Si-O characteristic peak near 1130 cm <-1 > and a Si-O-Si characteristic peak near 1005 cm <-1 > in an infrared reflection spectrum; the method comprises the following steps: determining an infrared reflection spectrum of a kaolinite family mineral to be classified through a Fourier transform infrared spectrometer, and distinguishing kaolinite, dickite and pearl pottery stone in the kaolinite family mineral according to a wave number difference between a Si-O characteristic peak near 1130 cm <-1 > and a Si-O-Si characteristic peak near 1005 cm <-1 >. The kaolinite group minerals are distinguished according to the wave number difference between the Si-O characteristic peak near 1130 cm <-1 > and the Si-O-Si characteristic peak near 1005 cm <-1 > in the infrared reflection spectrum, and the problems that in an existing gemstone detection method, the kaolinite group minerals cannot be distinguished through nondestructive detection, and the detection accuracy is high can be solved. And the kaolinite group minerals can be distinguished only through infrared transmission spectrum or X-ray diffraction analysis and other detection methods for damaged samples.

The invention relates to a solar control coating and a coated article. The solar control coating (30) includes a first phase adjustment layer (40), a first metal functional layer (46), a second phase adjustment layer (50), a second metal functional layer (58), a third phase adjustment layer (62), a third metal functional layer (70), a fourth phase adjustment layer (86), and an optional protective layer (92). At least one of the metal functional layers (46, 58, 70) comprises a metal functional multi-film layer comprising (i) at least one infrared reflecting film and (ii) at least one absorbing film. The solar control coating provides enhanced solar control and / or aesthetic performance.

The invention relates to a transparent directional radiation refrigeration material and a preparation method thereof. The transparent directional radiation refrigeration material is formed by assembling a sawtooth grating film deposited with an infrared reflecting layer and an impedance matching layer filled with a sawtooth structure. The infrared reflecting layer is a transparent metal oxide layer. The transparent directional radiation refrigeration material satisfies the following conditions: the average transmittance of a visible light wave band is greater than or equal to 65%; the average emissivity difference value between the high emission side and the low emission side of the middle infrared band is larger than or equal to 40%. Compared with the prior art, the radiation cooling material disclosed by the invention has high transmittance in a visible light wave band and asymmetric directional high emissivity in a middle infrared wave band, so that the radiation cooling effect of the building facade transparent enclosure structure can be improved; the problem that the radiation refrigeration performance is limited due to the omni-directional high emissivity of traditional glass of a building facade is solved, and the energy-saving effect of a facade window can be improved.

The invention relates to a laminated pane comprising an outer pane (1) and an inner pane (2) connected to each other via a thermoplastic intermediate layer (3), and an infrared reflective coating (20) on the surface (II, III) of the outer pane (1) or the inner pane (2), the surface of said infrared reflective coating (20) facing the intermediate layer (3). The infrared reflective coating (20) comprises three silver layers (21.1, 21.2, 21.3), wherein each silver layer (21.1, 21.2, 21.3) is arranged between two dielectric layers or a sequence of layers (M1, M2, M3, M4). The invention is based on the object of designing an infrared reflective coating (20) such that it can be provided with a visually inconspicuous insulated wire (5). According to a first method, the infrared reflective coating (20) is configured to have a very low reflectance. According to a second method, the infrared reflective coating (20) is configured to have a reflected color similar to the reflected color of the lowermost dielectric layer or sequence of layers (M1).