US 11,933,985 B2
Method for producing light-guide optical elements
Ido Fuchs, Ness Ziona (IL); Edgar Friedmann, Sdey-Avraham (IL); Elad Sharlin, Mishmar David (IL); Kobi Greenstein, Ness Ziona (IL); Lilach Zuaretz, Ness Ziona (IL); Tsion Eisenffeld, Ashkelon (IL); Shimon Grabarnik, Rehovot (IL); Amir Shapira, Ness Ziona (IL); and Dror Hermoni, Ness Ziona (IL)
Assigned to LUMUS LTD., Ness Ziona (IL)
Appl. No. 17/417,175
Filed by Lumus Ltd., Ness Ziona (IL)
PCT Filed Feb. 2, 2021, PCT No. PCT/IL2021/050118
§ 371(c)(1), (2) Date Jun. 22, 2021,
PCT Pub. No. WO2021/152602, PCT Pub. Date Aug. 5, 2021.
Claims priority of provisional application 62/969,103, filed on Feb. 2, 2020.
Prior Publication US 2022/0357498 A1, Nov. 10, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0028 (2013.01); G02B 6/0035 (2013.01); G02B 6/0065 (2013.01); G02B 6/0078 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0178 (2013.01)] 15 Claims
OG exemplary drawing
 
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.