Patent ID: 6219121
Filing Date: 2001-04-17
Classification: G02B

Abstract:
An anti-reflective (AR) optical element operable when disposed proximate to a partially reflective surface to substantially reduce reflection of visible light from the surface over a relatively wide range of incidence angles, the AR optical element comprising:an absorptive polarizer having an incident light side and a reflective surface side; andan acrylonitrile-based optical retarder disposed adjacent the reflective surface side of the absorptive polarizer, wherein a retardation magnitude for light at of a wavelength of interest incident on the retarder at an angle normal to a surface of the retarder is within 15% of a retardation magnitude for light of the wavelength of interest incident on the retarder at an angle of incidence of at least about 30.degree., measured from normal incidence.