Reduced ultraviolet radiation transmitting, electrochromic assembly
First Claim
1. A reduced ultraviolet radiation transmitting electrochromic assembly, said assembly comprising:
- first and second spaced, optically transparent elements, said elements having facing surfaces defining a space between said first and second elements;
an electrochromic medium confined in said space whose light transmittance is variable upon the application of an electric field thereto;
means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium;
ultraviolet radiation reducing means incorporated in said assembly for reducing ultraviolet radiation degradation of said electrochromic medium in said assembly;
said ultraviolet radiation reducing means comprising a sheet of specialized glass, said specialized glass sheet being transmitting in the visible portion of the electromagnetic spectrum but having reduced transmission in the ultraviolet portion of the electromagnetic spectrum.
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Accused Products
Abstract
An electrochromic assembly which is useful, for example, as a rearview mirror or glazing is disclosed with reduced ultraviolet (UV) radiation degradation and reduced fogging or misting in high humidity conditions. The assembly may include a pair of glass or other elements confining an electrochromic medium therebetween. Ultraviolet radiation is preferably reduced by a sheet of specialized glass which may include higher iron oxide or cerium oxide content than conventional soda lime window glass. The specialized glass is preferably a tinted glass that absorbs substantially more light in those regions of the visible spectrum higher than about 560 nanometers than in other regions of the visible spectrum. An anti-fogging additive may also be included in the assembly.
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Citations
33 Claims
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1. A reduced ultraviolet radiation transmitting electrochromic assembly, said assembly comprising:
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first and second spaced, optically transparent elements, said elements having facing surfaces defining a space between said first and second elements; an electrochromic medium confined in said space whose light transmittance is variable upon the application of an electric field thereto; means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium; ultraviolet radiation reducing means incorporated in said assembly for reducing ultraviolet radiation degradation of said electrochromic medium in said assembly; said ultraviolet radiation reducing means comprising a sheet of specialized glass, said specialized glass sheet being transmitting in the visible portion of the electromagnetic spectrum but having reduced transmission in the ultraviolet portion of the electromagnetic spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A reduced ultraviolet radiation transmitting electrochromic assembly, said assembly comprising:
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first and second spaced, optically transparent elements, said elements having facing surfaces defining a space between said first and second elements, and wherein said first element is located closer to a source of ultraviolet radiation than said second element; an electrochromic medium confined in said space whose light transmittance is variable upon the application of an electric field thereto; means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium; ultraviolet radiation reducing means incorporated in said assembly for reducing ultraviolet radiation degradation of said electrochromic medium in said assembly; said ultraviolet radiation reducing means comprising said first element being a sheet of specialized glass, said specialized glass sheet being transmitting in the visible portion of the electromagnetic spectrum but having reduced transmission in the ultraviolet portion of the electromagnetic spectrum; and wherein said specialized glass is selected from the group consisting of glass having an iron oxide content of at least 0.2% by weight, and glass having a cerium oxide content of at least 0.2% by weight. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification