Patent Number: 6,295,173

Title: Configuration for color division and/our recombination

Abstract: A configuration of prisms is capable of spectral division, or spectral color combination, or both simultaneously even with reflected light that undergoes a change of polarization. The configuration includes first and second prisms each with pairs of faces that respectively form first and second prism angles. One face of one prism is engaged against one face of the other prism with no air gap between. Light of a first spectral range is incidence substantially perpendicular on the other prism face of the first prism after entering the first prism and undergoing a double reflection before leaving the first prism. Light of a second and third spectral range are also incident on the other face of the first prism and pass substantially unreflected through the first prism. Light of the second spectral range after leaving the first prism and entering the second prism is double reflected in the second prism. Light of the third spectral range substantially passes through the second prism as well without reflection. A thin film system is provided between the engaged faces of the first and second prism and has a spectral reflection behavior as a function of the angle of incidence of the reflected light which is matched to the first and second prism angle such that light of the first spectral range, at an angle of incidence which is about equal to the first prism angle, is at least largely reflected and light incidence at this same angle but of the second and third spectral range is at least largely transmitted. Light of the second spectral range at an angle of incidence of twice the second prism angle minus the first prism angle is largely reflected.

Inventors: Heine; Claus (Chur, CH)

Assignee: Unaxis Balzers Aktiengesellschaft

International Classification: G02B 27/14 (20060101); H04N 9/31 (20060101); G02B 005/04 ()

Expiration Date: 09/25/2018