主权项 |
1. An optical system comprising a flat, plate-like light guide made of a transparent material for coupling light from at least one approximately point light source into the flat, plate-like light guide wherein:
the point light source is arranged above a first surface of the flat, plate-like light guide and is associated with an optical element that in-couples light from the point light source into the flat, plate-like light guide; the in-coupled light satisfies the conditions of the critical angle for total reflection and remains inside the flat, plate-like light guide until controlled out-coupling; the optical element comprises a recess in the first surface; and a reflective cone is directly incorporated in the flat, plate-like light guide within the recess, wherein the reflective cone comprises an outer surface with a reflective coating disposed thereon, and is configured to reflect light from said point light source, so as to couple light from the point light source into the flat, plate-like light guide. |