Multicomponent optical body
Assignee3M Innovative Properties Company
InventorsJohn A. Wheatley, Timothy J. Nevitt, William W. Merrill, Michael F. Weber
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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.
Claims22
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.
Dependencies are inferred from the claim text.