Multicomponent optical body
First Claim
1. A reflective film that reflects light in the infrared region of the spectrum while transmitting light in the visible region of the spectrum,the reflective film comprising a multilayer film M1 comprising an optical repeating unit R1 that comprises polymeric layers A, B and C arranged in an order ABC, the polymeric layer A having refractive indices nxa and nya along in-plane axes x and y respectively, the polymeric layer B having refractive indices nxb and nyb along in-plane axes x and y respectively, the polymeric layer C having refractive indices nxc and nyc along in-plane axes x and y respectively, polymeric layers A, B and C having a refractive index nza, nzb and nzc respectively along a transverse axis z perpendicular to the in-plane axes, wherein nxa>
- nxb>
nxc, or nya>
nyb>
nyc, or both nxa>
nxb>
nxc and nya>
nyb>
nyc, and wherein at least one of the differences nza−
nzb or nzb−
nzc is less than 0 or both the differences are substantially equal to 0.
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Accused Products
Abstract
Multilayer polymeric films and other optical bodies are provided. The films, which have at least three layers of different composition in the optical repeating unit, reflect light in a first portion of the spectrum while transmitting light in a second portion of the spectrum, exhibit improved reflectivities at oblique angles, and can be designed to suppress one or more higher order harmonics of the main reflection band.
175 Citations
22 Claims
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1. A reflective film that reflects light in the infrared region of the spectrum while transmitting light in the visible region of the spectrum,
the reflective film comprising a multilayer film M1 comprising an optical repeating unit R1 that comprises polymeric layers A, B and C arranged in an order ABC, the polymeric layer A having refractive indices nxa and nya along in-plane axes x and y respectively, the polymeric layer B having refractive indices nxb and nyb along in-plane axes x and y respectively, the polymeric layer C having refractive indices nxc and nyc along in-plane axes x and y respectively, polymeric layers A, B and C having a refractive index nza, nzb and nzc respectively along a transverse axis z perpendicular to the in-plane axes, wherein nxa> - nxb>
nxc, or nya>
nyb>
nyc, or both nxa>
nxb>
nxc and nya>
nyb>
nyc, andwherein at least one of the differences nza−
nzb or nzb−
nzc is less than 0 or both the differences are substantially equal to 0.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
wherein each multilayer film M1 and M2 have first order reflections in the infrared part of the spectrum, and wherein the optical repeating unit R1 monotonically varies in optical thickness along the thickness of the multilayer film M1 in the transverse direction. -
15. A reflective film according to claim 14, wherein the optical repeating unit R2 has a substantially constant optical thickness along the thickness of multilayer film M2.
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16. A reflective film according to claim 15, wherein the optical thickness of the optical repeating unit R2 is less than or equal to the minimum optical thickness of optical repeating unit R1 along the thickness of multilayer film M1.
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17. A reflective film according to claim 15, wherein the optical thickness of optical repeating unit R2 is equal to or greater than the maximum optical thickness of optical repeating unit R1 along the thickness of multilayer film M1.
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18. A reflective film according to claim 14, wherein the optical repeating unit R2 monotonically varies in optical thickness along the thickness of the multilayer film M2 opposite to the monotonically optical thickness variation of optical repeating unit R1.
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19. A reflective film according to claim 18, wherein the minimum optical thickness of optical repeating unit R2 along the thickness of multilayer film M2 is substantially equal to the minimum optical thickness of optical repeating unit R1 along the thickness of multilayer film M1.
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20. A reflective film according to claim 18, wherein the maximum optical thickness of optical repeating unit R2 along the thickness of multilayer film M2 is substantially equal to the maximum optical thickness of optical repeating unit R1 along the thickness of multilayer film M1.
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21. A reflective film according to claim 14, wherein the optical repeating unit R2 consists of a first and second polymeric layer.
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22. A reflective film according to claim 21, wherein the first and second polymeric layer have an index of refraction nz1 and nz2 respectively along the z-axis and the difference between nz1 and nz2 is not more than 0.03.
- nxb>
Specification