G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/28 (2006.01) G02B 5/30 (2006.01)
Patent
CA 2511787
Multilayer films are provided that exhibit a colored appearance when viewed at an oblique angle as a result of one or more reflection bands (32b, 32c) in the visible region of the spectrum. The films however provide no substantial reflection bands (32a) in either the visible or near infrared regions for light normally incident on the film. The films can be made to be clear at normal incidence to an arbitrary designed color at an oblique angle of incidence without necessarily becoming cyan. These properties can be achieved with a multilayer interference film construction with appropriate selection of layers thicknesses and refractive indices. The film comprises alternating layers of a first and a second light transmissible materials with at least one of the materials being birefringence, such that there is a substantial match of refractive indices of adjacent layers along the in-plane axis, and a substantial mismatch of refractive indices along the thickness axis.
La présente invention concerne des films multicouches qui ont une apparence colorée lorsqu'ils sont considérés selon un angle oblique, en conséquence de la présence d'une ou de plusieurs zones visibles du spectre. Les films n'ont cependant sensiblement aucune bande de réflexion dans le domaine du visible ou de l'infrarouge proche pour de la lumière ayant une incidence normale sur le film. Le film peut être conçu pour passer d'une apparence claire à incidence normale à une couleur arbitraire désignée avec un angle d'incidence oblique, sans devenir nécessairement cyan.
Gilbert Laurence R.
Hebrink Timothy J.
Jonza James M.
Ruff Andrew T.
3m Innovative Properties Company
Smart & Biggar
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