Patent ID: 6049419
Filing Date: 2000-04-11
Classification: B32B,G02B,Y10S,Y10T

Abstract:
An optical body comprising:(a) a birefringent dielectric multilayer film having a reflecting band positioned to reflect infrared radiation of at least one polarization at an incident angle normal to the film, said reflecting band having a short wavelength bandedge .lambda..sub.a0 and long wavelength bandedge .lambda..sub.b0 at a normal incident angle, and a short wavelength bandedge .lambda..sub.a.theta. and long wavelength bandedge .lambda..sub.b.theta. at a maximum usage angle .theta., wherein .lambda..sub.a.theta. is less than .lambda..sub.a0 and .lambda..sub.a0 is selectively positioned at a wavelength greater than about 700 nm; and(b) at least one component which at least partially absorbs or reflects radiation in the wavelength region between .lambda..sub.a.theta. and .lambda..sub.a0 at a normal angle of incidence.