Patent ID: 11886008
Assignee: LUMUS LTD.
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 17:
18. A method of fabricating a compound light-guide optical element (LOE):
obtaining a first optical block comprising:
at least a first pair of faces,
a first region formed from a stack of LOEs, each of the LOEs having a pair of major parallel surfaces and a set of mutually parallel partially reflective internal surfaces located between the parallel surfaces and inclined obliquely to the parallel surfaces such that the first region comprises a first plurality of partially reflective internal surfaces, and
a second region having a second plurality of mutually parallel partially reflective internal surfaces non-parallel to the first plurality of partially reflective internal surfaces;

cutting the first optical block along a cutting plane that passes through one of the faces of the first pair of faces, thereby forming a first optical structure having an interfacing surface at the cutting plane;
obtaining a second optical block having a second pair of faces and a plurality of mutually parallel reflective internal surfaces;
bonding together the first optical structure and the second optical block such that one of the faces of the second pair of faces is joined to the interfacing surface and such that the plurality of reflective internal surfaces is non-parallel to both the first plurality of partially reflective internal surfaces and the second plurality of partially reflective internal surfaces, thereby forming a second optical structure; and
slicing out at least one compound LOE from the second optical structure by cutting the second optical structure through at least two cutting planes substantially parallel to the major parallel surfaces of consecutive LOEs of the stack of LOEs.