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Assignee3M Innovative Properties Company
InventorsLin Zhao, Gilles J. Benoit, Matthew B. Johnson, Raghunath Padiyath, Edward J. Kivel
Estimating the term…
A multilayer optical film includes a plurality of optical repeat units where each of the optical repeat units includes at least individual first and second layers. The first and second layers in each of the optical repeat units have respective indices of refraction n1 and n2 and corresponding respective f-ratios f1 and f2 along a same in-plane first direction for a same first visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, where n1>n2, and one of f1 and f2 is between about 0.55 and about 0.80. For illuminant D65 light incident on the multilayer optical film, the multilayer optical film reflects and transmits the incident light with the reflected and transmitted lights having color shifts below specified limits in a CIE L*a*b* color space. A glass laminate includes the multilayer optical film disposed between glass layers.
1-15. (canceled)
A multilayer optical film comprising a plurality of optical repeat units numbering between about 10 and about 300 in total, each of the optical repeat units comprising at least individual first and second layers, each of the first and second layers having an average thickness of less than about 500 nm, the first and second layers in each of the optical repeat units having respective indices of refraction n1 and n2 and corresponding respective f-ratios f1 and f2 along a same in-plane first direction for a same first visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, n1>n2, and one of f1 and f2 is between about 0.55 and about 0.80, wherein for a light incident on the multilayer optical film from an illuminant D65, the multilayer optical film reflects and transmits the incident light with the reflected and transmitted lights, in a CIE L*a*b* color space, having respective “a*” colorimetric parameters ar1* and at1* for an incident angle of less than about 10 degrees and respective “a*” colorimetric parameters ar2* and at2* for an incident angle of about 40 degrees, a magnitude of a difference between each of ar1* and ar2*, and at1* and at2* being less than about 20.
A multilayer optical film comprising a plurality of optical repeat units numbering between about 10 and about 300 in total, each of the optical repeat units comprising at least individual first and second layers, each of the first and second layers having an average thickness of less than about 500 nm, the first and second layers in each of the optical repeat units having respective indices of refraction n1 and n2 and corresponding respective f-ratios f1 and f2 along a same in-plane first direction for a same first visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, n1>n2, and one of f1 and f2 is between about 0.55 and about 0.80, wherein for a light incident on the multilayer optical film from an illuminant D65, the multilayer optical film reflects and transmits the incident light with the reflected and transmitted lights, in a CIE Lab color space, having respective “b*” colorimetric parameters br1* and bt1* for an incident angle of less than about 10 degrees and respective “b*” colorimetric parameters br2* and bt2* for an incident angle of about 40 degrees, a magnitude of a difference between each of br1* and br2*, and bt1* and bt2* being less than about 15.
A multilayer optical film comprising a plurality of optical repeat units numbering between about 10 and about 300 in total, each of the optical repeat units comprising at least individual first and second layers, each of the first and second layers having an average thickness of less than about 500 nm, the first and second layers in each of the optical repeat units having respective indices of refraction n1 and n2 and corresponding respective f-ratios f1 and f2 along a same in-plane first direction for a same first visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, n1>n2, such that the f-ratio f1 of at least one of the optical repeat units varies by more than about 0.1% across the multilayer optical film, wherein for a light incident on a major surface of the multilayer optical film at an incident location from an illuminant D65, the multilayer optical film reflects and transmits the incident light with the reflected and transmitted lights, in a CIE L*a*b* color space, having respective “a*” colorimetric parameters ar1* and at1* for an incident angle of less than about 10 degrees and respective “a*” colorimetric parameters ar2* and at2* for an incident angle of about 40 degrees, the reflected and transmitted lights, in the CIE Lab color space, having respective “b*” colorimetric parameters br1* and bt1* for the incident angle of less than about 10 degrees and respective “b*” colorimetric parameters br2* and bt2* for the incident angle of about 40 degrees, wherein for each incident location across at least 80% of a total area of the major surface:
Dependencies are inferred from the claim text.