Patent ID: 9519110
Filing Date: 2016-12-13
CPC Classification: G01D,G02B

Claim Text:
1. A light guide comprising: an entry surface shaped to collimate light entering the light guide in an entry direction along an optical axis; and a plurality of planar reflective surfaces arranged to reflect light inside the light guide along the optical axis to exit the light guide at an exit surface in an exit direction, the exit direction having a component in a direction opposite the entry direction, wherein the light guide comprises two limbs extending from either end of a back portion, free ends of the limbs being respectively shaped to provide the entry and exit surfaces, wherein the ends of the back portion are shaped to each provide a reflective portion, and wherein one of the limbs is shorter than another one of the limbs, thereby providing a space for accepting a movable part including at least one of polarizing portion or a filtering portion, the moveable part capable of intersecting the optical axis.