Patent ID: 11934002
Assignee: LUMUS LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 5:
6. A method for manufacture of a lightguide optical element (LOE) for use in an optical system, the method comprising the steps of:
(a) providing a first layer having two major surfaces separated by a first thickness, said first layer containing a first set of mutually-parallel partially-reflecting surfaces non-parallel to said major surfaces;
(b) providing a second layer having two major surfaces separated by a second thickness, said second layer containing a second set of mutually-parallel partially-reflecting surfaces obliquely angled to said major surfaces;
(c) combining said first and second layers with two of said major surfaces in facing relation and with said second set of partially-reflecting surfaces non-parallel to said first set of partially-reflecting surfaces to form a compound structure having a third thickness that is at least the sum of said first and second thicknesses; and
(d) bonding to said compound structure an additional lightguide component juxtaposed to said compound structure, said additional lightguide component having a thickness equal to said third thickness and containing a third set of mutually-parallel at-least-partially-reflecting surfaces non-parallel to said second set of partially-reflecting surfaces,
such that said LOE is bounded by two mutually-parallel major external surfaces.