Patent ID: 7006735

Claim:
A light guide comprising: at least first, second, third and fourth light guide sections; and at least one light coupling element between the light guide sections; the light guide sections each having an entrance aperture, an exit aperture and at least first and second guide walls defining a light guiding direction; the light coupling element being composed of an optically transparent material having first, second and third entrance faces each with a TIR surface, and an exit face with a TIR surface, the TIR surfaces of the first, second and third entrance faces being adjacent to the exit apertures of the first second and third light guide sections, respectively, the TIR surface of the first entrance face being substantially colinear with the first guide wall of the second light guide section, the TIR surfaces of the second and third entrance faces being substantially colinear with the first and second guide walls of the fourth light guide section, and the TIR surface of the exit face being adjacent to the entrance aperture of the fourth light guide section and being substantially colinear with the second guide wall of the second light guide section; the light coupling element also having an internal surface which is either a dichroic surface for reflecting light of a predetermined reflection band, or a polarizing surface for reflecting light of a predetermined polarization state; the light coupling element having two dichroic elements.