IP Library › Granted Patent US 12,372,799
Granted Patent B2
US 12,372,799 · App. 17/792,452 · Granted Jul 29, 2025

Rotatable lightpipe

Inventors: Shimon Grabarnik (Rehovot, IL); Tsion Eisenfeld (Ashkelon, IL)
Assignee: LUMUS LTD.
G02B27/0994G02B3/08G02B27/0172
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Quick Facts
Patent No.
US 12,372,799
App. No.
17/792,452
Granted
Jul 29, 2025
Kind
B2
Abstract

Based on a rotational axis of symmetry for an output of a lightpipe coinciding with an input axis for projection optics, the lightpipe can be rotated around the rotational axis, in order to align the lightpipe with a frame of associated glasses, or correspondingly the temple of a wearer of the glasses. Thus, an improved or optimal aesthetic look of a display system can be approached. The lightpipe of the display system can be aligned with the frame of the glasses, or even hidden within the frame, depending on implementation details and requirements for image projection components. If a pantoscopic tilt of the lens (waveguide) changes, a rotation of the lightpipe can be applied to the lightpipe to bring the lightpipe in a position aligned with the temple again, thus avoiding the need for a lightpipe redesign.

Claims (20)

1. An apparatus comprising:

(a) projecting optics ( 24 ) including a spatial light modulator (SLM) ( 8 ), the projecting optics having a projecting optics input surface ( 24 N) having an x-axis and y-axis corresponding to an input surface of said spatial light modulator ( 8 ); (b) a lightpipe ( 2 ) having a lightpipe axis ( 30 ) along a long axis of the lightpipe from a lightpipe input surface ( 2 N) to a lightpipe output surface ( 2 T), and having an output z-axis ( 10 ) perpendicular to said lightpipe output surface and said projecting optics input surface ( 24 N), said lightpipe ( 2 ) deployed with said lightpipe axis ( 30 ) at an oblique angle relative to said x-axis, said y-axis, and said z-axis; and

(c) an anisotropic diffuser ( 3 ) configured to accept output light ( 28 T) from said lightpipe output surface ( 2 T) and provide diffused light ( 28 D) toward said projecting optics input surface ( 24 N), said diffuser ( 3 ) disposed parallel to said lightpipe output surface ( 2 T) and rotated non-parallel to both said x-axis and said y-axis of said projecting optics input surface ( 24 N).

2. The apparatus of claim 1 wherein said anisotropic diffuser ( 3 ) has a non-symmetric function scattering light into a wider range of angles in a first direction relative to scattering light into a smaller range of angles in a second direction.

3. The apparatus of claim 1 wherein said diffuser ( 3 ) is deployed in contact with said lightpipe output surface ( 2 T).

4. The apparatus of claim 1 wherein said lightpipe ( 2 ) and said diffuser ( 3 ) are configured in an illuminating system ( 26 ), said illuminating system ( 26 ) further including a light source ( 1 ) providing input light ( 28 N) via a first Fresnel lens ( 22 A) to a lightpipe input surface ( 2 N).

5. The apparatus of claim 4 wherein said illuminating system ( 26 ) further includes a second Fresnel lens ( 22 B) and a polarizer ( 4 ) via which said diffused light ( 28 D) is provided toward an illuminating system output surface ( 26 T).

6. The apparatus of claim 1 wherein said lightpipe ( 2 ) is configured in an illuminating system ( 26 ), said illuminating system rotatably connected to said projecting optics ( 24 ).

7. The apparatus of claim 1 wherein said lightpipe axis ( 30 ) is nonparallel to said output axis ( 10 ).

8. A method of deploying the apparatus of claim 1 wherein said lightpipe ( 2 ) is substantially aligned with a frame axis ( 110 ) of a frame ( 11 ) of a user's glasses, said frame axis ( 110 ) being a longitudinal axis along a frame ( 11 ), said frame ( 11 ) being between a lens of the glasses and the user's ear.

9. An apparatus comprising:

(a) projecting optics ( 24 ) including a spatial light modulator (SLM) ( 8 ), the projecting optics having a projecting optics input surface ( 24 N) having an x-axis and y-axis corresponding to an input surface of said spatial light modulator ( 8 ); and

(b) a lightpipe ( 2 ) having a lightpipe axis ( 30 ) along a long axis of the lightpipe from a lightpipe input surface ( 2 N) to a lightpipe output surface ( 2 T), and having an output z-axis ( 10 ) perpendicular to said lightpipe output surface and said projecting optics input surface ( 24 N), said lightpipe ( 2 ) deployed with said lightpipe axis ( 30 ) at an oblique angle relative to said x-axis, said y-axis, and said z-axis,

wherein said lightpipe ( 2 ) is configured in an illuminating system ( 26 ), said illuminating system rotatably connected to said projecting optics ( 24 ),

wherein said illuminating system ( 26 ) further includes an anisotropic diffuser ( 3 ) operationally connected to said lightpipe ( 2 ) such that said lightpipe ( 2 ) and said diffuser ( 3 ) rotate synchronously relative to said rotational axis ( 10 ).

10. An apparatus comprising:

(a) projecting optics ( 24 ) including a spatial light modulator (SLM) ( 8 ), the projecting optics having a projecting optics input surface ( 24 N) having an x-axis and y-axis corresponding to an input surface of said spatial light modulator ( 8 ); and

(b) a lightpipe ( 2 ) having a lightpipe axis ( 30 ) along a long axis of the lightpipe from a lightpipe input surface ( 2 N) to a lightpipe output surface ( 2 T), and having an output z-axis ( 10 ) perpendicular to said lightpipe output surface and said projecting optics input surface ( 24 N), said lightpipe ( 2 ) deployed with said lightpipe axis ( 30 ) at an oblique angle relative to said x-axis, said y-axis, and said z-axis,

wherein said lightpipe ( 2 ) is configured in an illuminating system ( 26 ), said illuminating system rotatably connected to said projecting optics ( 24 ),

wherein said illuminating system ( 26 ) further includes an anisotropic diffuser ( 3 ) such that said lightpipe ( 2 ) and said diffuser ( 3 ) rotate independently relative to said rotational axis ( 10 ).

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 13, 2022
From: GRABARNIK, SHIMON; EISENFELD, TSION
To: LUMUS LTD.
Reel/Frame 060492/0165 →
Continuity (2)
Provisional Application 63023272 · May 12, 2020
Related Publication 20220390754A1 · Dec 8, 2022
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