Optical film with sharpened bandedge
First Claim
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1. A reflective film comprising:
- one or more first regions having a first plurality of optical repeating units arranged to have a first continuously varying optical thickness gradient that substantially defines a first reflection band of the reflective film, one or more second regions having a second plurality of optical repeating units arranged to have a second continuously varying optical thickness gradient that substantially defines a second reflection band of the reflective film, and a third region having a third plurality of optical repeating units arranged to have a third continuously varying optical thickness gradient that varies differently from the first gradient and that substantially defines a first bandedge slope of the first reflection band.
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Abstract
The present invention provides reflective films and other optical bodies which exhibit sharp bandedges on one or both sides of the main reflection bands. The optical bodies comprise multilayer stacks M1 and M2, each having first order reflections in a desired part of the spectrum and comprising optical repeating units R1 and R2, respectively. At least one of the optical repeating units R1 and R2 varies monotonically in optical thickness along the thickness of the associated multilayer stack.
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Citations
36 Claims
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1. A reflective film comprising:
one or more first regions having a first plurality of optical repeating units arranged to have a first continuously varying optical thickness gradient that substantially defines a first reflection band of the reflective film, one or more second regions having a second plurality of optical repeating units arranged to have a second continuously varying optical thickness gradient that substantially defines a second reflection band of the reflective film, and a third region having a third plurality of optical repeating units arranged to have a third continuously varying optical thickness gradient that varies differently from the first gradient and that substantially defines a first bandedge slope of the first reflection band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 13. A reflective film comprising a plurality of optical repeating units that generally vary in optical thickness from a lower optical thickness near one surface of the film to a higher optical thickness near the other surface of the film, wherein the film has a first region where the optical thickness of optical repeating units varies according to the first profile that substantially defines a reflection band of the reflective film, and a second region where the optical thickness of optical repeating units varies according to a second profile different from the first profile that substantially defines a bandedge slope of the reflection band.
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26. A reflective film comprising a purality of optical repeating units, wherein the film includes a first region where the optical thickness of optical repeating units varies monotonically to define a reflection band of the film, and a second region where the optical thickness of optical repeating units remains substantially constant to define a bandedge slope of the reflection band.
- 27. A reflective film comprising a plurality of optical repeating units, wherein the film includes a first region where the optical thickness of optical repeating units varies according to a first profile that substantially defines a reflection band of the film, and a second region where the optical thickness of optical repeating units varies according to a second profile different from the first profile that substantially defines a bandedge slope of the reflection band, the bandedge slope averaging at least about 2 percent change in transmission per nanometer for wavelengths contained within the bandedge.
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29. A reflective film comprising a plurality of optical repeating units, each optical repeating unit including at least two layers that exhibit an index of refraction difference between them, wherein the film has a first region where the optical thickness of optical repeating units varies according to a first profile that substantially defines a reflection band of the reflective film, and a second region where the optical thickness of optical repeating units varies according to a second profile different from the first profile that substantially defines a bandedge slope of the reflection band.
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30. A reflective film comprising:
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a plurality of optical repeating units, wherein the film has a first region where the optical thickness of optical repeating units varies according to a first profile that substantially defines a first reflection band of the relfective film, a second region where the optical thickness of optical repeating units varies according to a second profile that substantially defines a second reflection band of the reflective film, and a third region where the optical thickness of optical repeating units varies according to a third profile different from the first profile that substantially defines a bandedge slope of the first reflection band. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification