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

Claim 0:
1. A method for producing 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 method comprising the steps of:
(a) bonding together a plurality of parallel-faced plates at a plurality of interfaces so as to form a stack of plates, one face at each of said interfaces having a coating to provide partially-reflecting optical properties;
(b) cutting and polishing said stack of plates to form a boundary plane intersecting at least one of said interfaces;
(c) bonding a block of transparent material to said stack at said boundary plane to form a precursor structure; and
(d) slicing said precursor structure along a plurality of parallel planes so as to form a plurality of slices, each slice containing a part of said stack for providing the active region of the LOE and a part of said block to provide the secondary region of the LOE.