LIGHT PROJECTOR AND VISION SYSTEM FOR DISTANCE DETERMINATION

摘要

A light projector comprises a stack of layered planar optical elements where the stack comprises a group (103) of planar optical elements (107-111) arranged to provide a plurality of light patterns. The stack may specifically comprise a group of transparent layers having opaque patterns such that light propagating through the layers results in the light patterns. The light patterns reach a microlens array (101) which is arranged to focus the light patterns at different focal distances. In some scenarios, programmable optical elements may be used to generate the light patterns. A vision system may determine characteristics of objects based on reflections of the projected light patterns. The approach may in particular provide an efficient yet low cost light projection system for distance determination.