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Assignee3M Innovative Properties Company
InventorsKevin T. Huseby, Stephen A. Johnson, Samuel A. Minno, Lin Zhao, William T. Fay, Robert L. Brott, Gilles J. Benoit
Estimating the term…
A multilayer optical film includes a plurality of optical repeat units. Each of the optical repeat units includes at least four sequentially arranged first through fourth layers including first and third layers having respective f-ratios f1 and f3. The optical film has a first order reflection band having a reflection peak height Rp1 and any second order reflection band has a reflection peak height Rp2, where Rp1/Rp2≥5. Rp1/Rp2 may remain at least 5 when changing at least one of the f-ratios f1 and f3 continuously by 0.2. A thickness of each of the second and fourth layers can be less than a thickness of each of the first and third layers by at least a factor of 2, or a thickness of a same one of the first and third layers can differ from a thickness of each other layer by at least a factor of 2.5.
A multilayer optical film comprising a plurality of optical repeat units, the optical repeat units in the plurality of optical repeat units numbering greater than about 10 in total, each of the optical repeat units comprising at least four individual layers, first and second individual layers in the at least four individual layers of each of the optical repeat units having respective f-ratios f1 and f2 for respective indices of refraction in a same in-plane x-direction, 0.5≤f1≤0.8, 0.02≤f2≤0.3, such that for a substantially normally incident light polarized along the x-direction, the multilayer optical film has a first order reflection band disposed at wavelengths greater than about 700 nm, and at least no second order reflection band,
Dependencies are inferred from the claim text.