TW201101521A - Solar reflecting mirror having a protective coating and method of making same - Google Patents

Abstract

A solar reflecting mirror includes a shaped glass substrate having a focal area, a reflective coating over its convex surface and a sodium ion barrier layer over its concave surface. The shaped substrate has a strain pattern having a radial tension strain at the bottom area, and circumferential compression strain at the periphery of the substrate. As the distance from the periphery of the shaped substrate increases, the circumferential compression strain decreases to a "transition line" where circumferential tension strain begins. As the distance from the transition line in a direction toward the bottom area of the glass substrate increases, the circumferential tension increases. To compensate for the strain pattern in the shaped glass substrate to avoid buckling of, and surface cracks of, the barrier layer, the barrier layer including an oxide of silicon and aluminum thickness, among other things is varied on. A method of making the solar mirror from shaped sections is also discussed.

Description

201101521 VI. Description of the Invention: [Technical Field] The present invention relates to a solar mirror (for example, a parabolic solar reflective glass mirror) having a protective coating (for example, an anisotropic barrier layer) and a method of manufacturing the same, and more specifically In other words, the present invention relates to an inspective barrier layer on the concave surface of the mirror to prevent precipitation of alkaline ions (e.g., sodium ions) on the concave surface of the mirror. Preferably, the alkaline barrier layer of the present invention has scratch and chemical resistance characteristics to avoid frictional damage to the concave surface of the mirror. [Prior Art] At present, there is a concern to improve the efficiency of a solar concentrator, such as (and not limited to the present invention), to improve the efficiency of a solar mirror (for example, a parabolic mirror) for reflecting solar rays to be located at the parabolic mirror The device in focus. The device is typically of the type known in the art to convert the amount of solar energy to another available form of energy, such as electrical energy. In another prior art embodiment, the parabolic mirror is a first mirror that reflects sunlight to a second mirror that is at a focus relative to the first mirror to reflect the sunlight to the conversion device. In general, the parabolic mirror includes a parabolic substrate having a reflective surface (e.g., a silver coating) on the convex surface of the shaped substrate. The preferred shaped substrate material is soda lime bismuth glass because of the high yield in forming a flat glass sheet into a parabolic sheet or substrate; the low cost of manufacturing a flat glass sheet; and the application of a solar reflective coating to the surface of the shaped glass substrate High output and low cost. Although sodium sulphate glass is a material used in solar mirrors, the material of 147285.doc 201101521 is acceptable, but the use of glass is limited. More specifically, the flat glass sheet is heated to u〇〇 during the forming process. The temperature above Fahrenheit (hereinafter also referred to as F) is formed into a parabolic shape. During the heating and forming of the glass sheet, alkaline ions (e.g., sodium ions) in the glass sheet are diffused or leached from the glass sheet. In addition, during the exposure of the parabolic glass to the solar energy (e.g., long-term environmental exposure), additional sodium ions are leached from the glass substrate. As is known to those skilled in the art, the leaching or diffusion of such sodium ions from the glass is an expected event, and at a low temperature, a slow, slow, heat, heating of the glass and/or the glass for a long period of time. Exposure to solar energy will accelerate the leaching or diffusion of sodium ions from the glass and increase the amount of sodium ions leached from the glass. The glass leached sodium ions react with moisture in the atmosphere and convert the sodium ions into sodium compounds such as sodium hydroxide and sodium carbonate. The nano-compounds can be patterned on the surface of the glass and deposited on the surface of the glass in the form of a precipitate. Precipitation of the sodium compound reduces visible light transmission through the glass (for example, when the parabolic glass substrate is ◎), reduces the transmission of solar energy to the reflective coating on the four surfaces of the shaped glass substrate, and reduces the passage of solar energy reflected from the reflective coating. The shaped glass substrate is transmitted to the concave surface of the shaped glass substrate.

The light passing through the precipitate is away from the focus of the first mirror. The sodium compound on the surface of the concave glass is a diffusing surface (which directs the reflection and the focus of the mirror). The term 147285.doc 201101521 is used herein to mean that a ray of light incident on the reflective surface has a light reflecting surface equal to the angle of incidence of the angle of reflection. The term "non-mirror or diffuse surface" as used herein means that the light incident on the reflective surface has a light reflecting surface that is different from the angle of incidence of the reflected angle. Another limitation of the glass must be handled with care to avoid scratching the glass surface. Scratches on the surface of the glass can also transform the mirror into a non-specular or diffuse surface. As will be appreciated by those skilled in the art, since the reflective concave surface changes from a specular surface to a non-specular or diffuse surface, the percentage of reflected solar light incident on the focus of the parabolic mirror will be reduced, thereby reducing the solar mirror. effectiveness. Techniques for removing and/or eliminating the precipitation of sodium compounds from the concave surface of the parabolic mirror include cleaning the surfaces and/or enclosing the concave surface of the mirror in a sealed chamber having an inert gas to prevent precipitation of the sodium ions. . Current techniques for removing scratches include polishing the surface of a scratched glass sheet. All of these techniques to ensure that the surface of the solar mirror remains mirrored are extremely expensive. The barrier layer is known in the art, for example, as disclosed in U.S. Patent Nos. 4,238,276, 5, 270, 615, 5, 830, 252 and 6, 027, 766, and U.S. Patent Application Serial No. 08/597,543, and U.S. Patent Publication No. 2007/0275253 A1. One limitation of currently available alkaline barrier layers and/or scratch resistant layers is that they can be effectively applied to the planar or shaped surface of a glass substrate, but cannot be effectively used to subsequently form a curved surface (eg, a concave parabolic mirror). Surface) of the surface of the plate. In the prior art, the problem that must be solved when the substrate coated with the barrier layer and/or the scratch-resistant layer is from the planar coated substrate is a parabolic coated substrate. Identification or discussion is minimal (if any). More specifically, in the prior art, the fracture and/or buckling of the coating is eliminated when the profile of the coated glass is changed from a flat glass sheet to a shaped glass substrate having a concave surface. There are very few discussions (if any). As in the present application. (d) Solution '# When the barrier coating is pressed, the coating is broken and the ions are exposed to the atmosphere' and a steel compound precipitates on the surface of the glass substrate, and/or when When the barrier coating and/or the ten-scratch coating buckles, the surfaces change from a specular surface to a non-specular or diffuse surface. As will be appreciated by those skilled in the art, an alkaline barrier coating or layer having a scratch resistant property (e.g., a sodium ion barrier coating) is provided to prevent the concave surfaces of the first and second mirrors from being converted from specular to Non-mirror or diffuse surfaces will be an advantage. SUMMARY OF THE INVENTION The present invention is directed to a solar mirror having a curved reflective surface, and particularly comprising a transparent substrate having a convex surface and an opposite concave surface, and a reflective coating over the convex surface and - An organic barrier layer or coating over the concave surface. The reflective coating reflects the electromagnetic spectrum of the selected wavelength. Furthermore, the present invention relates to a method of manufacturing a solar energy mirror having a curved reflective surface, in particular by providing a flat transparent sheet; shaping the sheet to provide a convex surface and an opposite concave surface and focus The region is opened to a transparent substrate, a reflective coating is applied over the convex surface of the substrate, and an alkaline barrier layer is provided over the concave surface of the substrate. Furthermore, the present invention relates to a base 147285.doc 201101521 barrier layer comprising, inter alia, an oxide of bismuth and aluminum. Furthermore, the invention relates to a solar reflector having a curved reflective surface. The mirror includes, in particular, a plurality of transparent shaped segments; a fixture is provided to hold the segments together to provide a shaped transparent substrate having a convex surface and a relatively concave surface, the shaped substrate having a focal region and solar reflection above the surface a coating, wherein the coating reflects visible and infrared light of the electromagnetic spectrum toward a focal region of the shaped transparent substrate. The invention further relates to a method of making a shaped solar mirror. The method is achieved, inter alia, by shaping two or more flat transparent segments to provide two or more shaped transparent segments, wherein each of the shaped transparent segments comprises a portion of (i / (the total number of segments of the shaped transparent substrate)) a glass transparent substrate; the shaped transparent segments are secured together to provide the shaped transparent substrate, wherein the shaped transparent substrate comprises, in particular, a convex surface and an opposite concave surface having a focal region, and is provided over at least one surface of the transparent substrate A reflective coating. [Embodiment] In the following discussion, the spatial and directional terms of the present invention, such as "inside", "outside", "left", "right", "upper", "lower", "horizontal", "vertical", etc. It is shown in the figure. It should be understood, however, that the present invention can assume a variety of alternative orientations, and thus such terms should not be construed as limiting. In addition, it should be understood that all numbers of the dimensions, physical characteristics, and the like, which are used in the specification and the scope of the patent application, are to be construed as being modified by the term "about" in each case, and unless otherwise indicated, the following patent specification and The numerical values specified in the scope of the patent application will vary according to the requirements of the invention which are intended to be obtained by the invention. At the minimum, and not as intended to limit the application of the teachings equivalent to the scope of the patent application, the numerical parameters should be understood at least in accordance with the number of significant digits reported and by applying routine rounding techniques. In addition, it should be understood that all ranges disclosed herein are inclusive of any and all sub-ranges thereof. For example, the stated range of Γ1 to 10" shall be deemed to include any and all sub-ranges between (and including) a minimum of 丨 and a maximum of 10; that is, 'all starting with a minimum of i or greater and A sub-range ending with a maximum of 10 or more, such as m7, or 3 2 to 81, or 5 5 to 10. In addition, the terms "administered above" or "provided above" are used herein to mean that they are applied or provided but not intended to be in surface contact. For example, applying a material to a substrate or substrate surface does not exclude the presence of one or more other materials of the same or different composition between the deposition material and the substrate or substrate surface. In the prior art, the present invention is not limited to the details of the specific non-limiting embodiments shown and discussed herein. Further, the terminology used herein is for the purpose of description and not limitation, unless otherwise, the sufficiency, V nr ϋ ^ ^ The barrier coating or layer of the present invention is discussed in detail below. In the invention, the Ximu oxide coating also provides resistance to the machine == damage (for example, from the positive range 7_ (and especially the system 9) The chemical etching protection of the substance to 14). Unless otherwise stated, the following discussion of the characteristics of the soil of the coating of the present invention is suitable for the properties of the coating of the present invention. In this case, the coating thickness is less than 50 nm. (The following 147285.doc 201101521 is called "nm"), the bismuth aluminum oxide coating of the present invention loses resistance to mechanical damage and chemical damage. For the sake of clarity, the term "alkaline barrier layer or coating" And "sodium ion barrier layer or coating" means a layer or coating that acts to avoid or limit the formation of an inspector or nanoprecipitate barrier on the surface on which the layer or coating is applied or on the surface layer, and Having the resistance to mechanical or/and chemical damage to the above surfaces, as appropriate. "Protective layer or coating" means a layer or coating which has the ability to avoid or limit the surface (application of the layer or coating) Above it, or on the surface Resistance to mechanical and/or chemical damage, and/or may limit the formation of alkaline or sodium precipitates on the surface. A non-limiting embodiment of the invention will be discussed, which uses magnetron sputtering vacuum deposition (hereinafter also a coating treatment called "MSVD" to apply a coating or layer or film over a substrate surface or on a surface layer 'the substrate surface is a barrier against alkaline ions', for example, to prevent such sodium ions from reacting with moisture in the atmosphere The sodium ions are converted to sodium compounds (e.g., sodium hydroxide and sodium carbonate) which precipitate on the surface of the glass as discussed above). It should be understood that the present invention is not limited to the coating method, and the coating method may be any coating method of applying or coating an ion (e.g., sodium ion), a barrier film or a layer on or above the surface of the glass. The following discussion is directed to a non-limiting example of the application of an alkaline ion barrier coating or layer. Unless otherwise stated, the discussion may be adapted to a scratch resistant coating or enamel that is not limiting to the invention, and the glass may be a glass of any composition; the glass may be a clear or tinted glass, And / 147285.doc 1Λ 201101521 or the glass may be annealed, heat strengthened or tempered glass. The glass sheet or substrate can have any shape, thickness and size. Non-limiting embodiments of the invention are presented as embodiments relating to solar mirrors. However, the invention is not limited thereto, and the invention can be practiced in the manufacture of: commercial and residential windows; shower door glass; transparency for air, space, land and water vehicles; coated bottles; for thin film photovoltaic applications Coated glass; electrically heated glass for anti-fog commercial refrigerators; and glass for furniture. In the following discussion, the shaped solar mirror refers to parabolic reflection

Mirror 'However, the invention is not limited thereto, and unless otherwise stated, the invention may be practiced using any mirror having a curved reflective surface and a focus or focus region, such as, but not limited to, the invention: parabolic mirrors and spheres Shape mirror. "Focus" and "Focus Zone" are defined as locations where more than 8% of the sun's rays reflected from the mirror converge. The size and location of the "focus zone" does not limit the invention, and in a non-limiting embodiment of the invention, the focal zone is less than one fifth (丨/5) of the mirror reflection zone. As shown in Figure 1, it is a prior art shaped solar concentrator 2 (see Figure 2) to convert solar energy into an array of electrical energy 丨8. The present invention is not limited to the manner in which the solar concentrators 2 are connected in the array 18, and any technique known in the art can be used to connect the solar concentrators 20 in the array 18. In addition, the present invention is not limited to the number of solar concentrators 20 in the array (4). For example, the present invention can eliminate 2, 3, 4, 5, 10, 20, more than 5 在 in one solar concentrator. The array and any number of solar concentrators are combined. In addition, the present invention is an array of solar concentrators 2 that are mounted in a fixed position in any conventional manner, or an array 18 of solar concentrators 20 that are mounted in any conventional manner, 卩 147 147 285. The solar path maximizes the exposure of the solar concentrator to solar energy. Each of the solar concentrators 20 can each have the same or have a different design to direct the amount of solar energy to a particular area where the amount of solar energy is converted to an alternative source of energy (e.g., electrical energy or thermal energy). Referring to Figure 2', each solar concentrator core includes a shaping mirror, such as a parabolic mirror 22 (also referred to herein as a "first mirror") to concentrate solar energy on the device 26 to convert solar energy into electrical energy. The parabolic mirror "includes a parabolic glass substrate 28. The glass substrate 28 preferably has a total ion content of less than 20% by weight of 〇. 在 in the visible range (eg, 35 〇 to 77 〇 米 (nm)) And infrared (rIR)) (eg, higher than 77〇 to nanometer (“nm”)), 9〇% transmission of the electromagnetic spectrum, and low absorbance (eg, low in the visible range and infrared range) At 2%). The glass system having the aforementioned optical properties is disclosed in U.S. Patent Application Serial No. 12/275,264, the entire disclosure of which is incorporated herein by reference. The manner is incorporated herein. ppG IndusiHes, Inc. sells glass having the above characteristics under the trade names STARpHIRE and SOLARPHIRE PV. The shaped glass substrate 28 has a concave surface 3〇 and an opposite convex surface 32. The outer periphery of the shaped glass substrate 28 is formed. To provide the edge 33. As shown in Figure 1, the edges 33 of adjacent solar concentrators 2 are in contact with each other to maximize coverage of a region having a reflective surface. A reflective coating, layer or film 34 (clearly displayed) 2 is above the convex surface 32 of the shaped glass substrate 28 (and preferably on its surface layer). The reflective film 34 can be metal such as, but not limited to, silver, aluminum, nickel, stainless steel or gold. The reflective film 147285.doc 12 201101521 34 is typically silver. 〇❹ Continuing with reference to Figure 2, a parallel solar ray system, indicated by ray 36, is incident on the concave surface 30. One portion 37 of the ray 36 is from the concave surface 30.The conversion device 26 is directed, and a portion 38 passes through the concave surface 3〇 and through the shaped glass substrate 28, and passes through the shaped glass substrate 28 from the surface 42 of the reflective film 34 in the form of a reflection line 43 (refer to FIG. 2A). Reflected back to the conversion device 26. For purposes of clarity and brevity, the solar ray is represented by two rays 36 as shown in Figure 2, rather than an infinite number of parallel solar rays incident on the concave surface 30. As is known to those skilled in the art, there is reflection of such solar rays between the concave surface 3〇 and the convex surface 32 of the shaped glass substrate 28; however, the transmission of such solar rays incident and through the transparent substrate, A detailed discussion of absorption and reflection is well known in the art and need not be discussed further. In the embodiment shown in Figures 1 and 2, the conversion device % includes shaping relative to the focus of the parabolic mirror or first mirror 22. A second mirror 44, and a polished rod or light bar in the focal region of the second mirror 44 (shown explicitly in Figure 2). A multi-contact solar cell 48 is placed at the end 5 of the light bar 46. This configuration 'the reflected rays 37 and 43 (see FIG. 2A) are incident on the second mirror 44; the second mirror reflects the rays 37 and 43 to the end 52 of the light bar 46 (: monthly display) In Fig. 2), rays 37 and 43 passing through the light rod 46 and passing through the end 50 of the rod stop are directed to the solar cell 48 to convert the solar energy into electrical energy. It is understood that the solar cell 48 can be placed at the focus of the first mirror 22, and the second mirror 44 is omitted. The present invention does not limit the shape of the second mirror 44. More specifically, in this 147285.doc 13. 201101521 In the practice of the invention, the second mirror preferably has a flat reflective surface. In the practice of the invention, the second mirror is a circular flat glass sheet having a solar reflective coating surface (e.g., a silver coated surface). However, the invention can be practiced using a shaped second mirror having concave and convex surfaces and a reflective coating on at least one of the surfaces (e.g., convex surfaces). Referring to FIG. 1, a cover 6〇 (partially shown in the upper left corner of the figure) is supported above the array of solar concentrators to prevent dust and water from depositing on the concave surface of the parabolic mirror 22 of the solar concentrator 20. 30 on. As is known in the art, the cover 60 is transparent to the visible and electromagnetic wave specifications IR wavelength range. Optionally, the formed glass substrate 28 of the first mirror 22 has a port 64 (shown explicitly in Figure 2) at the bottom of the glass forming substrate 28 to provide access to the light bar 46 and the solar cell 48. As discussed in the "Prior Art" section above, currently available solar collectors are limited to the use of a soda-lime-glass substrate to the first mirror 22 and the second mirror 44. The glass substrates are typically manufactured from a float glass process (e.g., a method of making glass according to U.S. Patent Nos. 3,333,936 and 4,402,722, the disclosure of which is incorporated herein by reference) Cutting the glass piece. As is well known in the relevant art, the soda-lime glass contains sodium ions. Long-term environmental exposure (eg, the sun rays 36 striking the first mirror) heats the shaped glass substrate 28 and heats the glass to form the parabolic substrate 28 to provide energy for the sodium ions from the shaped glass The substrate 28 is diffused or leached. Nanoparticles leached from the shaped glass substrate 28 react with moisture in the atmosphere on the surfaces 30 and 32 and convert the nanoparticles into sodium compounds such as sodium hydroxide and sodium carbonate. The sodium compound 147285.doc •14·201101521 is deposited as a precipitate on the surface of the shaped glass substrate 28. Precipitation of the sodium compound on the concave surface 30 of the shaped glass substrate 28 reduces visible light transmission of the shaped glass substrate 28 and causes a concave surface 30 having a portion of the precipitate of the sodium compound to become a non-specular or diffuse surface (which directs the reflections) Lines 37 and 43 are remote from the focus of the first mirror 22 or away from the second mirror 44). A small amount, if any, of the sodium compound precipitates on the convex surface 32 of the first mirror 22 because the convex surface has the reflective coating 34 and a protective plastic coating or film 53 over the reflective coating ( Only shown in Figure 2). The protective coating 53 protects the reflective coating 34 from environmental damage as is known in the art, and in the practice of the present invention, the protective coating 53 limits sodium ions on the convex surface 32 of the glass substrate 28. It is prevented from reacting with the environment to form a sodium precipitate. While the protective coating 53 of the reflective coating 34 avoids the formation of sodium compound precipitates, the present invention contemplates the practice of the present invention on the convex surface 32 of the glass substrate 28. As can now be appreciated, the second mirror 44 made of soda-lime-germ glass can have the same disadvantages as the first mirror 22 except that the sodium compound precipitate on the second mirror directs the light reflected from the first mirror 22 away. The light rod is outside. Referring to Figure 3, in a non-limiting embodiment of the invention, the concave surface 3 of the shaped glass substrate 28 of the first mirror 22 has a sodium barrier coating or layer 66. Referring to Figure 4, the sodium barrier coating 66 is applied over the surface 68 of a circular plate glass sheet 70 (and preferably over its surface layer). The surface 68 of the granules is designated as the concave surface 3 of the formed glass substrate 28. In the practice of the present invention, the barrier layer 66 preferably transmits more than (four)%, more preferably more than (four) and an optimum force 147285.doc 15 201101521 visible light and claw light having an electromagnetic wave length. The barrier layer 66 is preferably capable of withstanding temperatures above the forming and bending temperatures of the glass, such as above 1220 for nano-calcium glass. The temperature of Fahrenheit ("F"). In addition, the barrier layer 66 preferably does not chip or buckle to some extent during the formation of the glass sheet 7 (), so that alkaline ions (such as sodium ions) cannot move through the crack in the barrier coating 66. And the buckling does not cause the rays to "and" deflect significantly away from the focus of the parabolic mirror 22. The discussion of the fracture in the barrier coating 66 and the buckling of the barrier coating 66 is shown in more detail below. In a non-limiting embodiment of the invention, the circular flat glass sheet 7 has a diameter of 18 inches (45.72 cm ("(: 111"))) and a diameter of 83 inches (21 mm ("mm The thickness of the barrier coating 66 of 85 atomic percent and 15 atomic percent of the aluminum oxide is deposited on the surface 68 of the glass sheet 70 by the MSVD coating method (designated as the shaped glass substrate) The surface 72 of the coated glass sheet (designated as the convex surface 32 of the shaped glass substrate 28) is placed on the open end 74 of a vacuum forming mold 76 (see Fig. 5A). And the glass sheet 70 and the mold 76 are heated in a furnace (not shown) to heat the glass sheet to 1220 卞 (660 ° C ("C")). The coated glass piece is in any conventional manner. 70 and the vacuum mold 76 are uniformly heated. After the coated glass sheet 70 and the vacuum mold 76 are heated to 1220T (660 C), air is evacuated from the interior 78 of the mold 76 by spacer holes 77 to force The heated glass sheet 70 enters the interior 78' of the vacuum mold 76 to obtain the formation of the coating 66 a glass substrate 28 (see Fig. 5B). The heated shaped glass substrate is controllably cooled to anneal the shaped glass substrate. As can be appreciated, the design of the present invention separately heats the glass sheet 70 and the 147285.doc 201101521 vacuum mold 76, and thus placing the glass sheet 7 on the open end 74 of the vacuum mold % and shaping the glass sheet 7 as described above. For heating glass, forming glass in a vacuum mold, for annealing glass and Methods and apparatus for coating glass are well known in the art and need not be discussed in detail. • During the forming process, since the flat glass sheet 70 (see Fig. 4) is biased or pulled into the interior 78 of the vacuum mold 76, The intermediate portion 79 of the flat glass sheet 7 is stretched. As a result of the stretching, at the bottom portion 80 of the formed glass substrate 28 (see Fig. 5B) (corresponding to the middle of the glass sheet 70 in Fig. 4) The thickness of the portion 79 and the hole 64) of Fig. 3 is 80% of the thickness of the intermediate portion 79 of the glass sheet 7 (see Fig. 4), and the thickness of the edge 81 of the shaped glass substrate 28 (see Fig. 5B) is Flat glass sheet 7〇 (See 〇5% of the thickness of the edge 82 of the figure. As can be appreciated, the edge 81 of the shaped glass substrate 28 is highly strained and optically distorted. In the practice of the invention, but not limited thereto, A segment 83 of the shaped glass substrate 28 (see Fig. 5b) is cut away to remove portions of the highly strained and optically distorted glass, and ◎ the edges 33 of adjacent shaped solar mirrors 2 are placed in close proximity to each other. As shown in the array 18 (see Figure 1), in the practice of the present invention, but not limiting, the invention will be measured from the peripheral edge 84 of the shaped glass substrate 28 toward the bottom 8 (see Figure 5B). A section of about 2 inches was removed. An additional portion of the outer peripheral edge of the shaped glass substrate is removed to obtain the edge 33 of the shaped glass substrate 28 (see Figure 3). The slit or hole 64 is cut out in the bottom region 8 of the formed glass substrate 28 (see Fig. 5B) (see Fig. 3). Thereafter, a reflective coating (eg, a silver layer) 34 is applied over the convex surface 32 of the shaped glass substrate 28 (see FIG. 3) and the protective film 53 (see FIG. 2) is applied to the reflective coating 34. 147285.doc 201101521 on. As is understood, the present invention is not limited to the method of cutting the hole 64 in the bottom region 80 (see FIG. 5B) of the shaped glass substrate 28, and cutting off the peripheral edge 84 of the shaped glass substrate, or is not limited to the shaped glass substrate. The method of applying the reflective coating 34 and the protective coating 53 over the convex surface 32 of 28 and any cutting and/or coating techniques known in the art can be used in the practice of the present invention. At 1200. The glass sheet 70 is thermally softened or viscous at a temperature ranging from 13 〇〇卞 (649 to 704 ° C); on the other hand, the barrier coating ό 6 of the present invention (for example, oxidation of Shi Xi ()) is a fire material and is at 12 〇〇. To 3(9). ^ (649 to 704 C) maintains dimensional stability at temperatures. As used herein, the term "stable in size" means that the physical dimension of the coating changes by no more than ± 5% and preferably no more than ± 2% during (and/or after) heating the glass sheet. During the formation of the slab glass sheet 70 to the shaped glass substrate 28, the strain patterns shown in Figs. 6 to 8 develop in the formed glass substrate 28. Referring to Figures 6 to 8, as needed, a radial tensile strain system indicated by numeral 90 exists at the bottom of the shaped glass substrate (refer to Figure 8) and the circumferentially swelled strain system indicated by numeral 92 is present in the shaped glass. The outer periphery 84 of the substrate 28. The barrier coating 66 experiences stress due to adhesion to the concave surface of the glass substrate. As the distance from the outer periphery 84 of the shaped glass substrate 28 increases in the direction toward the bottom region 8 of the 6-well shaped glass substrate 28 (see FIG. 7), the radial tensile strain 9 〇 generally remains unchanged, and the circumference The compressive strain 92 drops to the position designated as "transition line" and is determined by the number 9 4 in Figure 7, where the circumferential tensile strain (see Figure 8) specified by the number 1 〇 2 begins in the glass and the radial direction Tension strain 147285.doc • 18-201101521 9〇 (see Figure 8) is present in the glass. For the formed glass substrate 28 in question (for example, the shaped glass substrate 28 made of a flat glass sheet 7 having a diameter of 18 inches (45 72 cm) and a thickness of 83 inches (2" mm)) And the transition line 94 corresponds to one of the positions on the flat glass sheet 7 at a distance of about 3 inches (7.62 cm) from the center (i.e., from the center of the central portion 79 of the flat glass sheet 70). The position on the glass substrate 28. As the distance from the transition line 94 increases in the direction toward the bottom region 80 of the shaped glass substrate 28, the shaped glass substrate has an increased circumferential tension strain (specified by the number 1 〇 2) and has the radial tension Strain 90 (see Figure 8). As will be appreciated by those skilled in the art, the application in the shaped glass substrate 28 can be measured by any conventional method. In the practice of the present invention, the strain of the shaped glass sheet 28 in question is calculated using the ANSYS finite element computer program. In the circumferential compression region 1〇3 of the shaped glass substrate 28 (i.e., in the region between the outer perimeter 84 of the shaped glass substrate 28 (see FIG. 7) and the transition line 94), the sodium barrier coating 66 is observed at There is buckling in the radial direction perpendicular to the compressive strain in the glass. In this transition line 94 position, the barrier coating 66 is observed to have a radial crack region. In the circumferential tension zone ' region 104 of the formed glass substrate 28 (i.e., the region between the transition line 94 of the shaped glass substrate 28 (see FIG. 7) and the bottom region 80), the barrier coating 66 is observed to have Small random cracks or cracks. As described above, the maximum compressive stress is at the edge portion 81 of the shaped glass substrate 28 (see Figs. 5B and 7), and it is expected that the maximum buckling of the barrier coating 66 will exist on the δ-edge portion 81. It has also been observed that a very small amount of solar light impinging on the edge portion 8 of the forming glass substrate 28 of the first step 147285.doc -19-201101521 leads to the focus or focus area of the shaped glass substrate 28. In view of the above, a distance extending from the outer peripheral edge 84 of the shaped glass substrate 28 (which is equal to 10 to 15% of the distance measured by the peripheral edge 84 to the center of the bottom region 8 of the preliminary shaped glass substrate) is The edge portion 8 of the preliminary shaped glass substrate 28 is removed in a non-limiting embodiment of the invention for a shaped glass substrate 28 formed from a flat glass sheet 7 having a diameter of j 8 inches (45.72 cm). έ, cut from the outer peripheral edge of the shaped glass substrate toward the bottom 8 〇 (see the figure about 2 inches (5 〇 8 (10)), to remove the highly strained and optically distorted portion Glass. The additional portion of the peripheral edge of the shaped glass substrate is moved ten to provide the edge 33 of the shaped glass substrate 28 (see Figure 3). See, for example, the barrier coating for the observed and/or anticipated Defects caused by cracks or chipping, and defects observed and/or expected to be caused by buckling of the transfer wall coating. It is expected that the crack or crack extending across the thickness of the barrier coating (10) will be moisture in the atmosphere. With the glass dip The sodium ions provide channels that interact with each other to form a nano-compound deposited on the surface (10) of the barrier coating 66 (see Figure 7) and/or between the ', concave surface 3' of the shaped glass substrate 28. Precipitating. The sodium compound on the surface 1〇8 of the barrier coating layer 6 can change the mirror surface of the barrier coating 66 to a non-specular or main flying <jecting surface, and the barrier coating and the concave surface 3 The sodium compound between the crucibles can cause separation of the barrier coating 66. The buckling defect can change the surface 1〇8 of the barrier coating 66 from a specular surface to a non-specular or diffuse surface, and in the case of severe buckling (additional Producing the barrier 147285.doc -20- 201101521 Fragmentation of the wall coating. The following discussion is directed to the barrier coating 66, and unless otherwise stated, the discussion may apply to the scratch resistance of the barrier coating ( As described above, referring to Figures 9A to 9C, the barrier coating 66 on the side of the segment 110 of the glass sheet 7 (Fig. 9A) (expected to be a circumferential compression region 1〇3 (see Fig. 7)) has a side The length measured between 112 and 113, and the width measured between the edges 1 and 6 and 117 After the glass sheet 70 is formed into the shaped glass substrate 28, the segment 11 of the flat glass sheet 70 corresponds to the segment 118 of the shaped glass substrate 28. The convex surface 32 of the segment 8 of the shaped glass substrate 28 has The length as measured between the sides 112 and 113 of the segment 118 is slightly greater than the length measured between the sides 112 and ι 13 of the segment 11 of the plate glass 70 and the shaped glass substrate 28 The convex surface 32 of the segment 118 has a width as measured between the edges 116 and 117 of the segment 118 which is less than the flat glass sheet 7 as measured between the edges 116 and 117 of the segment 118. The width of the segment 110. The concave surface of the segment 118 of the shaped glass substrate 28 has a length as measured between the sides 112 and 113 of the segment 118, which is said to be larger than the segment 11 of the flat glass sheet 7 The length measured between 112 and 113' and the concave surface 3 of the segment 118 of the shaped glass substrate 28 has a width as measured between the edges 116 and 117 of the segment 118, which is less than as in segment 118. The width of the flat glass sheet 70 is measured between the edges 116 and n7. The difference between the length of the convex surface 32 and the length of the concave surface 3 (as measured between the sides 112 and 113 of the segment 118) is small. The difference in the difference between the width of the concave surface 30 (as measured between the edges 116 and 117 of the segment 118) 147285.doc 21 201101521 is greater than the difference between the concave and convex edges of the segment 118. By way of illustration and not limitation of the invention, the expansion measured between the edges 112 and 113 of the segment 丨丨0 and between the edges 112 and U3 of the segment ι18 is for both the concave edge and the convex edge. 2 to 6%. The contraction between the sides 116 and 118 of the segment 11〇 and between the edges 116 and 118 of the segment 118 measured at the outer periphery of the shaped glass substrate 28 is 14% with a 14% constricted concave edge 30. And a flange 32 having a 13% contraction. The elongation at the bottom 80' of the formed glass substrate 28 with respect to the convex and concave sides was 5% and 4%, respectively. Ο On the other hand, the length and width of the barrier coating 66 remain unchanged, and the width of the concave and convex surfaces of the shaped glass substrate 28 is reduced due to the width of the corresponding flat glass sheet 7〇. & songs are often called strains. More specifically, during the forming process, the glass is viscous and the buckling of the barrier coating 66 changes the contour of the concave surface 30 of the shaped glass substrate 28 to have a surface s of the pleats 120, such as a corrugation The surface (see Fig. 9B) is such that the width of the surface 72 of the flat glass slab 7 is reduced. The viscous fold 12G changes the surface (10) of the barrier coating 66 and the concave surface 3 of the shaped glass substrate 28 from the mirror surface in Fig. 9A to the non-mirror or diffusing surface in Fig. 9A. In the first example (Fig. 9B), as the thickness of the barrier coating (4) increases (for example, the barrier coating increases to a thickness of (10) nanometer (""), and the width of the flat panel shrinks It remains the same, (4) the number of 120 and the height of the wrinkles 12 增加 increase, straight, increase the diffuse percentage of reflected solar rays 37 and 43 (see Figures 2 and 2A). In the second (four) example (the thickness of the barrier coating 66 is reduced (for example, the thickness of the barrier is 6 〇 (10)), and the shrinkage of the width of the slab is still 147285.doc • 22- 201101521 remains unchanged, the number of pleats 120 in the second example (Fig. 9C) and the height of the pleats 120 are lower than the number of pleats 120 in the first example (see Fig. 9B) and The height of the pleats 120, which reduces the percentage of diffusion of the reflected solar rays 37 and 43 (see Figures 2 and 2A). As described above, the circumferentially compressed region 103 (see Figure 7) is offset from the shaped glass substrate 28 The distance of the outer circumference 84 is increased (see FIGS. 6 to 8) to be reduced; therefore, the percentage of shrinkage of the outer peripheral width of the concave surface 30 of the shaped glass substrate 28 is increased from the formed glass base.

The distance of the outer periphery 84 of the plate 2 8 is increased and decreased' and the thickness of the barrier coating 66 can be increased without increasing the number of wrinkles 120 and the extent of the wrinkles (see Figures 叩 and 9C). In a non-limiting embodiment of the invention, the thickness of the barrier coating 66 is selected to have sodium barrier properties and minimize buckling. More specifically, the minimum thickness of the barrier coating 66 is selected to prevent the sodium ions from reacting with moisture in the atmosphere to convert sodium ions into sodium compound sinks and to minimize buckling. As is well known to those skilled in the art, the mechanism of diffusion of sodium ions from the glass is a diffusion process and for the purposes of the present invention, the parameter of interest is the amount of nano ions present in the glass. The diffusion rate, the size of the detectable ions (e.g., sodium ions), and the energy for driving the sodium ions to the surface of the shaped glass substrate 28 are not considered to be related to the present invention. The use of the solar mirror is a long-term use, for example, 3 years. = The above-mentioned 'inspective ions in the glass or the composition of the glass and the thickness of the glass sheet' The thickness of the glass sheet 70 of the substrate 28 is increased, and the sodium ion in the number of fine glass is #it^iμ The system increases the thickness of the barrier coating and/or the density of 147285.doc •23- 201101521 degrees. For soda-lime-tantalum glass, the sodium ion concentration is generally μ% by weight. In a non-limiting embodiment of the invention, the parabolic mirror is made of a glass substrate having a thickness of 0.083 inches (2 mm). In a non-limiting embodiment of the invention, the barrier coating is an MSVD coating of 85 atomic percent lanthanum and cerium atom % aluminum oxide. Avoid the reaction of sodium ions with the water in the environment to convert the sodium ions into a minimum coating thickness of 40 nm. As is understood, any thickness greater than the minimum thickness prevents sodium ions from reacting with moisture in the environment; however, as the thickness of the barrier layer 66 increases, the severity of the buckling increases. In the practice of the present invention, the barrier coating 66 in the circumferential tension region 1 〇 4 (see FIG. 7) is preferably in the range of 4 〇 to j 〇〇 nm, more preferably 6 〇 to 1 〇〇 11111. Within the range, and optimally in the range of 6 〇 to 80 nm. The same coating composition having a coating thickness in the range of 4 Å to 1 〇〇 nm provides a protective coating against mechanical and chemical attack and/or damage. As described above, the flat glass sheet 70 is shaped using the vacuum mold 76 (see Figs. 5A and 5B). After the flat glass piece 70 is formed, the formed glass substrate is removed from the mold 76 when the glass system is dimensionally stable and annealed. For the purposes of the present invention, the glass may be dimensionally stable when it can support its own weight without changing its shape. The glass is dimensionally stable at a temperature of 1 050 °F for the glass of U.S. Patent Application Serial No. 12/275,264 and U.S. Patent No. 5,030,594, which are incorporated herein by reference. The annealing treatment reduces the intrinsic stress in the barrier coating 66 and in the shaped glass substrate 28 to minimize residual stress so as not to break the substrate 28 or to fracture the barrier coating 147285.doc -24 - 201101521 The barrier coating and the shaped glass substrate 28 are cut. The annealing apparatus and the speed at which the flat glass substrate 28 is annealed are not limited to the present invention, and any annealing apparatus and method and speed known in the art can be used in the practice of the present invention. Arthroplasty or uncoated glass articles are well known and need not be discussed further. The present invention does not limit the thickness of the glass sheet 70, and the glass sheet can be of any thickness. In the preferred practice of the invention, the glass sheet 7 is preferably lightweight to provide a lightweight shaped glass substrate 28. Although thin glass is preferred 'but the thickness of the enamel glass should be thick enough to have structural stability. As used herein, the term "structural stability" means that the glass must be processed into the parabolic mirror 22 (see 3) from the flat glass sheet 7 (see Figure 4) using a vacuum mold or press mold having minimal glass breakage. In the practice of the present invention, the thickness of the glass is preferably in the range of 0.075 to 0.126 inches (1.9 to 3.2 mm), more preferably in the range of 0.078 to 0.11 inch (2. to 2. 8). Within the range of mm), and the optimum is in the range of 0.083 to 0.091 inches (2.1 to 2.3 mm). ^ In the more basic business, the barrier coating "is 1 atomic percent and 85 atomic percent of lanthanum oxide. Increasing the atomic % of aluminum makes the coating hard. Although the hard coating reduces buckling, However, it is easily broken. The crush 1 in the coating can cause the moisture in the atmosphere to react with the sodium ions to convert the nano ions into sodium compounds. For the barrier coating of aluminum and antimony oxides Preferably, the coatings comprise from 30 to 100 atomic % lanthanum and lanthanum to 7 atomic percent aluminum, more preferably from 50 to 95 atomic % lanthanum and from 5 to 5 atomic percent aluminum (for example, Chuanzhi to less than (10) atoms. %石夕和以上至〇至70原子%明), and preferably includes 6〇 to 9〇 atom% Shi Xi and 10 to 40 atom% of Ming. As can be understood, the present invention is not limited to Shi Xi 147285. A barrier coating or film of an oxide of doc-25-201101521, and a sodium barrier film of any type known in the art can be used in the practice of the invention. Types of barrier coatings useful in the practice of the invention include, but are not limited to, disclosure Coating or film in U.S. Publication No. 2007/0275253 A1, the entire disclosure of which is incorporated by reference. The formula is incorporated herein. As understood by those skilled in the art of MS VD coating, the deposition parameters can be varied to reduce the intrinsic stress in the barrier film; however, as described above, the barrier film and the s-shaped glass substrate are Annealing at the same time to minimize residual stress so that the shaped glass substrate 28 can be cut without breaking the substrate 28. Thus, during deposition of the coating, the intrinsic stress in the barrier coating is reduced as appropriate. The present invention is not limited to the present invention. The design of the present invention is reduced in the shaped glass substrate 28 by shortening the time during which the glass sheet 7 (see Fig. 4) is formed into the shaped glass substrate 28 (see Fig. 5b). As can be appreciated, as the temperature of the glass sheet increases, the viscosity of the glass decreases, and the buckling amplitude of the barrier coating 66 increases because the coating has time to flex to its full extent, and The glass has time to flow in the plane of the coating, for example, the glass has time to flow into the pleats or 120 of the barrier coating 66 (see Figure 9C). In addition, the forming time is increased (ie, the glass sheet 70 is pulled to Forming The time spent in the cavity of the mold 76 increases the magnitude of the buckling of the barrier coating 66 because the coating 66 has time to flex to its full extent and the glass has time to flow into the barrier coating 66 (see Figure 4). Wrinkles or 12 inches (see Fig. 9C). In the practice of the invention, the glass sheet 7 is preferably formed to have a viscosity in the range of 丨〇〇X 1 〇 to 5·36 X 1 〇 9 poise. (When the glass piece is pulled into the true 147285.doc • 26·201101521 empty mold 76). In this viscosity range, it is found that the minimum buckling of the barrier coating 66 occurs when the forming time is three private, and it is found The maximum buckling of the barrier coating 66 occurs when the forming time is 25 seconds. Based on the foregoing, it is expected that for a glass having a viscosity range of 丨.00 χ 1〇7, 8 poises to 5 36 χ 1 〇 9 poise, the minimum buckling strain of the barrier coating 66 is greater than zero to five seconds and is preferred. Three seconds' and the maximum buckling of the barrier coating is 25 or more seconds. As will be appreciated by those skilled in the art, the temperature versus viscosity curve of the glass will depend on the composition of the glass. It has been determined that the type of soda-lime-tantalum glass sold by PPG Industries, Inc under the registered trademark STA STARPHIRE is between 1200 °F and 1300.

The temperature around the Ffe has a viscosity ranging from i.oo χ 1〇7.8 poise to 5 36 χ 1〇9 poise. In the practice of the invention, the STARPHIRE glass sheet 70 is heated in an oven set to 1300 Torr to heat the desired temperature of the glass sheet from 7 Torr to 122 Torr. The glass had a viscosity of 2.60 X 1 〇 9 poise, and it was found that the minimum buckling of the barrier coating 66 occurred when the forming time was three seconds, and it was found that the maximum of the barrier coating 66 occurred when the forming time was 25 seconds. Flexion. 0 As is known to those skilled in the art, the strain pattern of the convex edge of the shaped glass sheet 28 is similar to the strain pattern of the concave side of the shaped glass sheet 28. Referring to Figures 10 through 13 as desired, the present invention also contemplates shaping the segments by cutting certain segments from a flat glass sheet and joining the shaped segments together to obtain a shape similar to the shaped glass substrate 28 (see The formed glass substrate of Fig. 3) reduces the strain in the shaped glass substrate 28. In a non-limiting embodiment of the invention, the surface 124 of a planar glass sheet 126 is coated through the barrier coating 66 (see Figure 10). The surface 124 of the planar glass sheet 126 is intended to be the concave surface 128 of the shaped glass substrate i3 (see Figures 147285.doc -27-201101521 12 and 13). Four flat sheets 132 to 135 are cut from the glass sheet 126. Each of the plate segments 132-135 includes a fillet 136 of 14 and 14 turns; a flat end 142 connecting the edges 144 and 146; the edge 138 is attached to the edge 144 at a corner 148 and the edge 140 is at a corner 149 Connecting to the side 146 ° determines the size of each of the flat plate segments 13 2 to 13 5 such that the segments 132 to 135 are shaped to provide 1/4 of the shaped glass substrate 130 (see FIGS. 12 and 13) as follows, such that The formed segments 丨 3 2 to 1 3 5 are joined together to form the formed glass substrate 130 similar to the shaped glass substrate 28 (see Fig. 3). The present invention is not limited to the manner in which the segments 132 to 135 are cut from the glass sheet 126 and any cutting or scoring techniques known in the art can be used in the practice of the present invention. The edges of the segments 132 to 135 can be sewn as known in the art for safety purposes. Each of the plate segments 132 to n5 is shaped in any conventional manner using any of the pressing methods and apparatus known in the art, which are, for example, but not limited to, using a solid upper mold having a forming surface and having a flexible support surface. a lower mold; a solid mold having a forming surface; and a lower ring mold; and a vacuum upper mold having a surface for forming (for example, as disclosed in U.S. Patent Nos. 7,240,519 and 7,437,892, the entire contents of each of which are incorporated by reference. Incorporated herein) buckling. In a preferred practice of the invention, the segments 132 through 135 are formed using a true mold over the surface for forming. Referring to Figure 11, one of the segments 132-135 (e.g., segment 132) is heated to a viscosity in the range of 1.00 x 1 07.8 poise to 5.36 x 109 poise and provided on the curved surface 156 of the lower support member 157. 147285.doc -28-201101521 has a vacuum forming die 158 and a support member 157 that are moved relative to each other over the surface for forming, for example, moving the upper die 158 toward the lower support member 157 such that the segment 132 and the forming surface 159 contact. The vacuum is pulled through the forming surface 159 of the upper mold 158 to shape the segment 132. This process is repeated to shape the remaining three segments 133 to 135 to provide four shaped segments 160 to 163. Optionally, the four segments can be formed simultaneously by providing a forming die having four forming regions. The reflective coating 34 and the protective coating 53 (see Fig. 2) are applied to the convex surfaces of the 成形 shaped segments 160 to 163. In a preferred practice of the invention, the barrier coating 66 is applied to the surface 124 of the planar glass sheet 126, and the segments 132 through 135 are subsequently cut from the glass sheet 126. However, the present invention contemplates coating the barrier coating & to the plate segments 132 to 135 or the shaped segments 16A to 163. In the practice of the present invention, the reflective coating 34 and the protective coating 53 are applied to the convex surfaces of the shaped segments 166 to 163; however, the present invention designs the reflective coated layer 34 and the protective coating. Layer 53 is applied to the surface of the glass sheet 126 relative to the surface 124 of the glass sheet. As can be seen, if the reflective coating 34 and the protective coating 53 are applied to the segments 132 to 135 and then reshaped, the reflective coating 34 and the protective coating 53 must withstand the formation of the glass. The temperature of the glass segments 132 to 135, as appropriate, is applied to the protective coating 53 after forming the segments. The present invention is not limited to the number of the segments 132 to 135 which are joined to constitute the shaped glass substrate 13, and the formed glass substrate 130 can be formed by joining 2, 3, 4, 5 or more segments. As will now be appreciated, the greater the number of shaped segments of the glass substrate 130 that are joined to form the shaped 147285.doc -29-201101521, the greater the reduction in strain in the shaped glass substrate 28 or 130. Referring to Figures 12 and 13, the shaped glass segments 16A through 163 are joined together in any conventional manner. In a non-limiting embodiment of the invention, the segments 160-163 are placed together to form the shaped glass substrate 130, and a pair of rings 166 and 168 are secured to the reflective coating 34 by an adhesive. . In another non-limiting embodiment of the invention, the rings and 168 are attached to the convex surface 32 of the shaped glass substrate. Thereafter, the joined shaped segments 160 to 163 and the convex surfaces of the rings 166 and 168 are coated with the reflective coating 34 and the protective coating 53 in any conventional manner. In yet another non-limiting embodiment of the invention, the edges of the shaped segments are joined together by an adhesive, for example, as shown in Figure 12, the adhesive is adjacent to the formed sheets & Edges 14 and adjacent sides 138 of the shaped segments are joined together. As shown in Figs. 10 and 13, the fillet 136 forms a slit 64 of the formed substrate 13A. The present invention does not limit the manner in which the dimensions of the plate segments 132 to 135 are derived. For example, but not limiting of the invention, the dimensions of the slab segments can be derived from a computer program, and from constructing the shaped parabolic substrate, cutting the shaped substrate into a desired number of segments, and measuring the edges of the segments. As can be appreciated, applying the techniques described above will reduce strain in the glass and will reduce the buckling and fracture of the barrier coating 66; however, the barrier coating 66 will have buckling as long as the strain in the glass is maintained. And broken. In view of the foregoing inner valleys, the present invention is additionally designed to reduce the fracturing and buckling of the barrier layer by providing a barrier coating 66 of different thickness over the selective surface portion of the flat glass sheet 70. 147285.doc • 30· 201101521 The selective surface is designated as the shaped glass substrate 28 (see FIG. 3) and the shaped glass substrate 126 (see the concave surface 30 of the figure. In the following discussion, embodiments of the invention are on the flat glass sheet 70) The K-row row is provided with the formed glass substrate - 28 formed from the flat glass sheet 7'. However, unless otherwise stated, the present invention is applicable to apply the barrier coating 66 to the glass segments 132 to 135, or The shaped glass segments (10) to 163. In a first non-limiting embodiment of the invention, the barrier coating has a constant thickness over the surface 68 of the flat glass sheet 70 (see Figure 4), the surface 68 designated The concave surface % of the shaped glass substrate 28 (hereinafter referred to as "coating technique No. 1") is modified and supported in the concave surface 30 of the 5-well shaped glass substrate 28 in the second non-limiting embodiment of the present invention. Circumference library The barrier coating or layer 66 is applied by applying or depositing a thickness having a different thickness (e.g., as the distance from the perimeter 150 of the two glass sheets 70 increases in the direction of the π direction toward the central portion of the flat glass sheet 7). And compensation (hereinafter referred to as coating technique No. 2). In the third non-limiting embodiment of the invention, the circumferential strain in the concave surface 30 of the shaped glass substrate 28 is changed by application. Or depositing has two constant thicknesses (the first constant thickness is from the perimeter 170 of the flat glass sheet 70 to the transition line 94 (see the expected position of the figure, and the second strange thickness is from the transition line % to The central portion 79 of the flat glass piece 70, the second thickness of the barrier coating is thicker than the first thickness of the barrier coating, or the barrier coating is compensated (hereinafter referred to as "Coating Technology No. 3" The coating thickness 147285.doc • 31 · 201101521 used to fabricate the shaped glass substrate 28 (see FIGS. 3 and 5B) can be varied by masking the area of the flat sheet 70 to have a thin coating, such as When the central portion of the flat glass sheet 70 is coated, A baffle 170 is used to cover the surface of the glass sheet 70 (see Figure 14) intended to be a circumferential compression zone 103 (see Figure 7). By coating the surface 124 of the planar glass sheet 126 before or after, in the panel The contours of the segments 132 to 135 are cut and the coating technique number is applied to provide the segments 160 to 163. After the segments 132 to 135 are contoured in the flat glass sheet 126 by cutting lines, or from the glass After removing the segments 13 2 to 135 in the sheet, coating technique No. 2 was carried out by coating the fragments to provide the fragments 16 〇 to 163. The thickness of the coating 66 used in Coating Technology No. 2 increases with increasing distance from the flat end 142 (see Figure 1 〇) toward the fillet 136. After the segments 132 to 135 are contoured in the planar glass sheet 126 by cutting lines, or after the segments 132 to 135 are removed from the glass sheet, the coating is applied by coating the segments. Technology No. 3 is available for the 16th to 16th of the Temple of the Temple. The coating 66 for Coating Technology No. 3 is applied to the segments 132 to 135 to have the desired positions from the sides 144 and 146 of the plate segments 132 to 135 to the transition line 94 (see Figure 7). The first constant thickness 'and the second constant thickness from the transition line 94 to the rounded end 1 36 of the segments 132 to 135. The barrier coating 66 for coating technique No. 1 has a constant thickness in the range of 40 to 1 〇〇 nm or in the range of 80 to 100 nm. In a non-limiting embodiment of the invention, the barrier coating 66 comprises 85 atomic percent and 15 atomic percent of the oxide. A barrier coating 66 having a thickness of 80 nm is deposited on the surface 72 of the 5 slab glass 70 by the MSVD. The glass system is disclosed in U.S. Patent Application Serial No. 12/275,264, filed on Jan. No. No. No. No. No. No. No. No. No. No. No. The flat glass sheet 70 is a circular glass sheet having a diameter of n 75 inches; a total ion content of less than 〇〇2〇 weight ❶/〇, a transmission of 9〇% in the visible region of the electromagnetic spectrum and the 汛 region, and Absorbance below 2% in the visible and IR regions. The flat glass sheet 7 is formed in a vacuum mold to provide the shaped glass substrate 28, for example, a bending time of less than 25 seconds. After cooling the shaped glass substrate, the outer periphery of the shaped glass substrate is shaped as described above to provide a shaped glass substrate 28 having sides 33 and central holes 28 (see Fig. 3). A reflective silver coating is applied over the convex surface 32 of the shaped glass substrate 28 to provide the parabolic mirror 22. Coating Technology No. 2 provides a barrier coating 66 having a thickness that increases with increasing distance from the periphery of the flat glass sheet 70 to the central portion 79, such as the barrier coating (preferably, but not limiting of the invention) The thickness of 40 nm from the periphery 172 of the flat glass sheet 7 is increased to 80 nm at the portion 79 of the flat glass sheet. In this manner, the thickness Q of the barrier coating 66 increases as the circumferential strain in the deciduous glass decreases and the % shrinkage of the concave surface 30 of the shaped glass substrate 28 decreases to reduce buckling. The thickness of the barrier coating - 66 increases as the peripheral tension increases as the transition line 94 faces the central portion of the shaped glass substrate 28. Referring to Fig. 2, a section of the formed glass substrate 28 in the /peripheral tension region 1 〇 4 which is between the transition line 94 and the central region 8 (see Figs. 7 and 15) is shown. The barrier coating 66 has a crack 174, however the barrier coating 66 is sufficiently thick that the crack m does not extend to the surface 1〇8 of the barrier coating 66. The coating layer 66 for coating technique No. 3 has a first constant thickness from the desired position of the perimeter 172 of the flat glass sheet 7〇147285.doc 33-201101521 to the transition line 94 of the shaped glass substrate 28, and From the transition line 94 to a second constant thickness of the central portion of the flat glass sheet 7, wherein the first thickness of the barrier coating 66 is thinner than the second thickness of the barrier coating. In a non-limiting embodiment of the invention, the first constant thickness of the barrier coating 66 is in the range of up to 60 nm, more preferably in the range of 4 to 5 〇 nm, and the second The constant thickness is in the range of more than 60 to 1 〇〇 nm, more preferably in the range of more than 6 〇 to 8 〇 nm. Due to this configuration, the buckling of the barrier coating 66 is minimal in the circumferential compression zone 103, and the thickness of the barrier coating 66 is sufficiently thick in the circumferential tension region 104 that the cracks 174 do not extend to the barrier coating. The surface of layer 66 is 1 〇8. Moreover, due to this configuration, the barrier coating 66 is thinner between the peripheral edge 84 and the transition line 94 (i.e., the increased glass thickness to reduce the buckling of the barrier coating 66). And the barrier coating 66 is between the transition line 94 and the bottom region 80 of the shaped glass substrate 28 (ie, in the region of the thinner glass where the buckling is less severe than in the circumferential compression region 103, and the cracks The thickness of the 174 series is thicker. As can be appreciated, the present invention does not limit the change in coating thickness in the region of the transition line 94, and the change in thickness of the coating can be a gradual change or a step change. It will now be appreciated that in the example where the second mirror 44 includes a shaped substrate, only the technique of buckling the barrier coating 66 can be avoided to produce a shaped second mirror. Other embodiments of the invention include, but are not limited to: 1 applying the barrier layer 66 and/or the scratch resistant coating to the surface 68 of the flat glass sheet 70, the surface 68 being designated as the shaped glass substrate 28 147285. Doc -34 - 201101521 concave surface 30, and the barrier layer 66 is applied over the surface 72 of the flat glass sheet 7 (see Fig. 16), the surface 72 is designated as the convex surface, and the flat glass sheet is 70 is formed into the formed glass substrate 28. Subsequently, the reflective layer 34 and optionally the protective coating 53 are applied over the barrier layer 66 on the convex surface 32 of the shaped glass substrate 28; _ 2. the barrier layer 66 and/or the A scratch resistant coating is applied over the surface 68 of the flat glass sheet 70, which is designated as the concave surface of the shaped glass substrate 28, and the barrier layer 66 is applied to the surface of the flat glass sheet 7 Above, the surface 72 is designated as the convex surface of the flat glass sheet 70, and the reflective layer 34 is applied over the barrier layer 66 on the surface 72 (see Figure 17) 'and subsequently the flat glass sheet 7 Formed into the shaped glass substrate 28; 3. The flat glass sheet 70 is formed into a parabolic glass substrate 28, and the "IlI5 early wall layer 66" and/or the scratch resistant coating is applied to the parabolic glass substrate 28 Above the concave surface 30, and applying the reflective coating 34 to the convex surface 32 of the parabolic enamel glass substrate 28 (see FIG. 18); and 4. forming the flat glass sheet 70 into the shaped glass substrate 28, Applying the barrier layer 66 to the convexity of the shaped glass substrate 28 Above the surface 32, and applying the barrier layer and/or the scratch resistant coating to the concave surface thereof, and applying the reflective coating 34 to the barrier above the convex surface 32 (or on the surface) Above layer 66 (or on the surface) (see Figure 19). As can be appreciated, in the practice of the non-limiting embodiments of the present invention, when the reflective layer 34 and/or the barrier layer 66 and/or the scratch resistant coating are applied to the flat glass sheet 70, and When the coated flat glass is heated and formed (for example, as described in 147285.doc • 35-201101521), the reflective layer 34 and the barrier layer 66 and/or the scratch resistant coating have a high temperature to withstand formation (for example, Ability above 12〇〇卞). Reflective coatings which can withstand enthalpy are known in the art, for example, see U.S. Patent No. 7,329,433, the disclosure of which is incorporated herein in its entirety by reference. This patent discloses a primer film deposited on a reflective layer to protect the reflective layer during high temperature processing. In a preferred practice of the invention, the barrier layer 66 is applied using an MSVD device. As will be appreciated by those skilled in the art, the cathode for the MSvd coating must be electrically conductive. To provide a conductive tantalum cathode, aluminum is added to the crucible, for example above 5% by weight. However, the present invention does not limit the application of the barrier layer, and any coating method of applying the barrier layer can be used in the practice of the present invention. Further, the present invention is not limited to having a uniform barrier layer, and the present invention is designed to have a barrier layer composed of a varying composition of tantalum and aluminum oxide. For example, in a non-limiting embodiment of the invention, a first barrier layer of 6 Å atomic percent aluminum and 40 atomic percent lanthanum oxide is applied to the surface of the glass and 85 atomic weight A second barrier layer of % aluminum and 15 atomic percent of the oxide of the tantalum is applied over the first barrier layer. As will now be appreciated, the barrier layer 66 of the present invention can be used to prevent sodium ions from damaging the conductive layers of the photovoltaic device. More specifically, and with reference to Figure 2(), there is shown a photovoltaic device 184 having a conductive coating 186 over the barrier layer 66 of the present invention. The barrier layer 66 is applied to the surface 188 of the glass sheet 19 . The barrier layer 66 prevents the sodium ions from forming an attack and destroying the sodium compound of the conductive coating 186 of the photovoltaic cell 184. As discussed in detail above, the barrier layer of tantalum and aluminum oxide provides a protective layer of the glass in addition to the barrier that prevents nano ions from being removed from the glass, in addition to providing a barrier layer for the removal of nano ions from the glass. Mechanical and chemical damage to the surface. It will be readily understood by those skilled in the art that the non-limiting embodiments of the invention may be modified without departing from the scope of the invention. The scope of the invention is intended to be illustrative, and not to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an elevational plan view of a prior art solar concentrator array.

Figure 2 is an isometric view of a prior art solar concentrator, and Figure 2A is an enlarged view of a solar ray incident on a concave surface of the solar concentrator. Figure 3 is a view similar to the view of Figure 2 showing a solar mirror of the present invention. Figure 4 is an isometric view of a glass sheet having a coating of the present invention, the coating of Figure 4 having portions removed for clarity. Figure 5A is a side elevational view of a vacuum mold having the glass sheet of Figure 4 mounted to the open end of the vacuum mold, and Figure 5B is within the vacuum mold having the vacuum of the formed glass substrate of the present invention. A cross-sectional view of the mold. Fig. 6 is a top plan view of a molded glass substrate of the present invention, showing a mode of circumferential compressive strain around the periphery of the formed glass substrate. Figure 7 is a view of Figure 6 taken along line 7-7, which in particular shows the transition strain lines of the shaped glass substrate. Figure 8 is a view along line 8-8 of Figure 7 showing the peripheral tensile strain and radial tensile strain of the shaped glass substrate 147285.doc -37 - 201101521. Figure 9A is an isometric view of a fragment of the glass sheet shown in Figure 4; Figure 9B is an isometric view of the fragment shown in Figure 9A after forming the glass sheet into the shaped glass substrate, the coating having a peak And FIG. 9C is a view similar to the view of FIG. 9B showing a fragment of a shaped glass substrate manufactured by the teachings of the present invention having a reduced number of peaks and valleys, reduced peak heights, and reduced The depth of the valley. Figure 10 is a view similar to the view of Figure 4 showing another embodiment of the invention for fabricating a shaped solar mirror of the present invention comprising cutting a coated glass into segments. Figure 11 is an isometric top view of a glass sheet press configuration that can be used in the present invention to cut from a coated glass formed from Figure 1 . Figure 12 is a top plan view of a shaped solar lens of the present invention fabricated by joining shaped glass segments. Figure 13 is a view similar to the view of Figure 3 showing the shaped solar mirror of the present invention comprised of such shaped glass segments. Figure 14 is a view similar to the view of Figure 4 showing the coated baffle above the circular glass sheet. Figure 15 is a top plan cross-sectional view of the formed glass substrate at a position between the transition strain line and the bottom of the shaped glass substrate, the view showing the peripheral tension and the radial tension zone outside the formed glass substrate. The seam, for the purpose of clarity, does not show the cross section of the coating. Figures 16 through 19 are cross-sectional views of a section of a flat glass sheet of the type shown in Figure 4, 147, 285. doc - 38 - 201101521, having a barrier of the present invention on one or both surfaces of the glass sheets A coating and/or a scratch coating, and optionally a reflective surface over the surface of the glass. Figure 20 is a side view of a section of a barrier layer having a photovoltaic cell of the present invention. Figure 10 [Description of main component symbols]

18 Solar concentrator array 20 Formed solar concentrator 22 Parabolic mirror (first mirror) 26 Solar energy conversion device 28 Formed (parabolic) glass substrate 30 The concave surface of the shaped glass substrate 28 The convex surface of the shaped glass substrate 28 33 Edge 34 of the shaped glass substrate 28 Reflective coating or layer or film 36 Solar rays 37 Part of the sun's rays 38 Part of the sun's rays 43 Reflected rays 44 Forming the second mirror 46 Light rods or rods 48 Solar cells 50 Light or light rods 46 One end 52 light or one end of light bar 46 147285.doc -39- 201101521 53 64 Protective coating or layer or film slit or hole 66 68 70 72 74 76 barrier coating or layer or film plate glass 70 One surface (designated as concave surface 3〇) Flat glass piece (or sheet) One surface of flat glass piece 70 (designated to be convex surface 32) Open end of vacuum mold 76 Vacuum mold 77 Separation hole 78 79 80 81 82 83 84 90 92 102 103 The middle portion of the inner flat glass sheet 70 of the vacuum mold 76 forms the bottom portion of the glass substrate 28 and forms the edge flat plate of the glass substrate 28. Edge of glass sheet 70 Forming glass substrate 28 Segment forming Glass substrate 28 Outer peripheral edge Radial tensile strain circumferential compression strain circumferential tension strain circumferential compression region 104 108 112 112 circumferential tension region barrier coating or layer or film surface flat glass sheet 70 segment fragment 118 or 11〇 edge 147285.doc -40- 201101521 113 segment 118 or 110 edge 116 segment 118 or 110 edge 117 segment 118 or 110 edge 118 forming segment of glass substrate 28 - 120 wrinkle 124 Surface of sheet glass 126 Surface 126 Planar glass sheet 128 Concave surface of shaped glass substrate 130 成形 Formed glass substrate 132 Plate segment 133 Plate segment 134 Plate segment 135 Plate segment 136 Rounded corner 138 Edge 140 Edge 142 Flat end 144 Edge 146 Edge 148 Corner 149 Corner 156 Lower surface of support element 157 Lower support element 158 Upper vacuum forming die 147285.doc -41 - 201101521 159 Forming surface 160 of upper mold 158 Forming segment 161 Forming segment 162 Forming segment 163 Forming segment 166 Ring 168 Ring 170 Baffle 172 Circumferential cracks 174 184 photovoltaic devices (photovoltaic cells) 186 conductive coating 188 of the surface 190 of glass sheet 190 glass sheet 147285.doc -42-

Claims (1)

201101521 VII. Patent Application Range: 1. A solar reflector having a curved reflective surface, comprising: a transparent substrate having a convex surface and an opposite concave surface, and a reflective coating over the convex surface and a Above the concave surface - an alkaline barrier layer, wherein the reflective coating reflects an electromagnetic spectrum of a selected wavelength. 2. The solar mirror of claim 1 wherein the alkaline barrier layer has mechanical and chemical protection properties. 3. The solar mirror of claim 1 wherein the barrier layer is on a concave surface of the substrate and comprises an oxide of tantalum and aluminum. 4. The solar mirror of claim 3, wherein the barrier layer has a weight percent greater than the weight percent of aluminum. 5. The solar mirror of claim 4, wherein the barrier layer comprises 15 atoms. Aluminum and atoms/U, and s film were deposited by magnetron sputtering vacuum deposition. 6. The solar mirror of claim 5, wherein the barrier layer has a thickness in the range of % 〇 nanometer. 7_A solar lens as claimed, wherein the transparent substrate has a focus region, a soda-calcium-forming glass substrate, and the barrier layer is a nano-ion barrier layer. 8. The solar mirror of claim 7, wherein the barrier layer has a first surface and an opposite second surface, and the first surface of the barrier layer is in surface contact with the concave surface of the shaped glass substrate; and The second surface of the barrier layer faces away from the concave surface of the shaped glass substrate. «The solar lens of the long term 8 wherein the barrier layer comprises the oxygen of the stone and the first surface of the barrier layer has a first-weight percent of the stone and the 147285.doc 201101521 ίο. 11. 12. 13 14. 15. 16. The second surface of the barrier layer has a second weight percent enthalpy, wherein the first weight 〇/〇 is different from the second weight 0/. After that. A solar mirror according to claim 7 wherein the shaped glass substrate comprises at least two shaped glass segments held together to provide the shaped glass substrate. A solar mirror according to claim 10, wherein each of the segments comprises (1/the total segment of the shaped glass substrate) portions of the shaped glass substrate. The solar mirror of claim 7, wherein the periphery of the shaped glass substrate comprises four corners and four sides. The solar mirror of the seventh aspect of the invention, wherein the shaped glass substrate has a pattern of 'including a radial tension at the bottom region of the shaped glass substrate' and a circumferential compression at the periphery of the shaped glass substrate In the case where the distance from the periphery of the shaped glass substrate toward the bottom region of the shaped glass substrate increases, the circumferential compressive strain drops to the region where the transition line is defined (where the circumferential tension exists in the glass) The circumferential tension strain increases as the distance from the transition line toward the bottom region of the shaped glass substrate increases, and the solar mirror of the item 13 is covered by the barrier coating. The glass forming substrate has a concave surface and has a constant thickness. The solar mirror of claim 14 wherein the barrier layer has a thickness in the range of 6 〇 to (10) nm and a composition comprising 矽 and 铭And the reflective coating is a silver coating. The solar mirror of claim 13, wherein the thickness of the barrier coating is from 147285.doc 201101521 S The periphery of the panel increases as the distance from the bottom region of the shaped glass substrate increases. 1 7. The solar mirror of claim i, wherein the barrier coating is in the range of 4 to 1 nanometer. The solar mirror of claim 13, wherein the barrier coating has a first constant thickness from a perimeter of the shaped glass substrate to a transition line of the shaped glass substrate and a transition line from the shaped glass substrate to the forming a second constant thickness of the bottom region of the glass substrate, wherein the first constant thickness is different from the second constant thickness. 19. The solar mirror of claim 18, wherein the first constant of the barrier coating The thickness is in the range of 40 to 60 nanometers, and the second constant thickness is in the range of more than 60 to 1 nanometer. 〇 147285.doc