Patent ID: 11933985
Assignee: LUMUS LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  B | IPC F  G

Claim 14:
15. An intermediate work product sliceable along a plurality of parallel planes to form a plurality of light-guide optical elements (LOEs) each having a pair of mutually-parallel major external surfaces for guiding image illumination propagating within the LOE by internal reflection at the major external surfaces, each LOE further having an active region comprising a set of mutually-parallel partially-reflecting surfaces located between, and oriented non-parallel to, the major external surfaces, and at least one secondary region, at least one of said partially-reflecting surfaces terminating at a boundary between the active region and the secondary region, the intermediate work product comprising:
(a) a stack formed from a plurality of parallel-faced plates bonded together at a plurality of interfaces, one face at each of said interfaces having a coating to provide partially-reflecting optical properties, said stack being cut and polished at a boundary plane intersecting at least one of said interfaces; and
(b) a block of transparent material bonded to said stack at said boundary plane, and, wherein said plates have thicknesses differing from each other such that said interfaces are non-uniformly spaced.