Optical film having third or higher order visible reflection bands
Assignee3M Innovative Properties Company
InventorsTimothy J. Nevitt, Edward J. Kivel, William B. Black
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Abstract
An optical film including alternating polymeric layers and having distinct first, second and third reflection bands is described. The first, second and third reflection bands are each visible reflection bands at normal incidence for at least one polarization state. At least two of the first, second and third reflection bands are third order or higher order harmonics.
Claims25
An optical film having distinct first, second and third reflection bands;
- the first, second and third reflection bands each being visible reflection bands at normal incidence for at least one polarization state;
- each of the first, second and third reflection bands comprising a confined region of increased reflectivity on a plot of reflectivity versus wavelength, such that the reflectivity achieves a value of at least 80% within the confined region and the reflectivity is less than 50% in adjacent wavelength ranges on opposite sides of the confined region;
- at least two of the first, second and third reflection bands being third order or higher order harmonics;
- the optical film comprising alternating polymeric layers.
An optical film having distinct first, second and third reflection bands;
- the first, second and third reflection bands each being visible reflection bands at normal incidence for at least one polarization state;
- the optical film comprising alternating polymeric layers, wherein the first, second and third reflection bands are fourth, fifth and sixth order harmonics, respectively, of a single first order band.
An optical film having distinct first, second and third reflection bands;
- the first, second and third reflection bands each being visible reflection bands at normal incidence for at least one polarization state;
- the optical film comprising alternating polymeric layers, wherein one of the first, second and third reflection bands is a third order harmonic of a first order band and a different one of the first, second and third reflection bands is a third order harmonic of a different first order band.
Dependencies are inferred from the claim text.