Back to results
US 10,481,319 B2Granted
Overlapping facets
AssigneeLumus Ltd.
InventorsYochay Danziger, Tsion Axel Eisenfeld
Life of this patent
Estimating the term…
Abstract
Specific management of configuration of overlap of facets reduces non-uniformity in an image outcoupled toward a nominal point of observation. A waveguide including at least two parallel surfaces, first, middle, and last partially reflecting facets are configured such that in a geometrical projection of the facets onto one of the surfaces the facets overlap, preferably with adjacent facets overlapping and non-adjacent facets starts and ends coinciding along at least a portion of the waveguide.
Claims24
An optical device comprising:
- (a) a waveguide having:
- (i) a first of at least one pair of surfaces parallel to each other;
- (ii) a first region at which light is coupled into said waveguide;
- and
- (iii) a first sequence of facets including:
- (A) a first facet:
- (I) located proximally to said first region;
- and
- (II) having a first width in a direction between said first pair of surfaces;
- (B) a last facet:
- (I) at a distal end of said first sequence of facets from said first region;
- and
- (II) having a third width in a direction between said first pair of surfaces;
- and
- (C) one or more middle facets:
- (I) between said first facet and said last facet;
- and
- (II) having a second width in a direction between said first pair of surfaces;
- (b) wherein each of said facets:
- (i) width is in a plane of said facet;
- (ii) is an at least partially reflecting surface;
- (iii) is at an oblique angle to said first pair of surfaces;
- (iv) has a facet-start on a proximal side of said facet width;
- and
- (v) has a facet-end on a distal side of said facet width;
- and
- (c) wherein a geometrical projection is onto one of said first pair of surfaces in a direction of a nominal ray outcoupled from said waveguide, said nominal ray being a central ray of the light being coupled out of said waveguide,
- (d) said geometrical projection of said last facet and each of said one or more middle facets overlaps a respective said geometrical projection of an adjacent said one or more middle facets and said first facet, and
- (e) said geometrical projection of said facet-start of said last facet and each of said one or more middle facets coinciding with a respective said geometrical projection of a non-adjacent facet-end of said one or more middle facets and said first facet,
- (f) said coinciding along at least a portion of said waveguide.
27 more elements
Dependencies are inferred from the claim text.