SYSTEMS AND METHODS FOR ALIGNMENT OF OPTICAL COMPONENTS
Head-mounted displays may include a frame, a light projector coupled to the frame, a waveguide configured to direct images from the light projector to a user’s eye, and at least one flexure element coupled to the frame and physically supporting the waveguide in the frame. Various other methods, systems, and devices are also disclosed.
1 . A head-mounted display, comprising:
a frame;
a light projector coupled to the frame;
a waveguide configured to direct images from the light projector to a user’s eye; and
at least one flexure element coupled to the frame and physically supporting the waveguide in the frame.
2 . The head-mounted display of claim 1 , wherein the at least one flexure element abuts against an outer peripheral edge of the waveguide to physically support the waveguide in the frame.
3 . The head-mounted display of claim 1 , wherein each flexure element of the at least one flexure element comprises a flexible material configured to apply an inward biasing force against the waveguide.
4 . The head-mounted display of claim 1 , wherein the waveguide is at least partially transparent to visible light to enable the user to view a real-world environment through the waveguide.
5 . The head-mounted display of claim 1 , wherein the waveguide is separated from the light projector by a gap.
6 . The head-mounted display of claim 1 , wherein the at least one flexure element comprises at least three flexure elements.
7 . The head-mounted display of claim 1 , wherein the light projector comprises at least three subprojectors, wherein each of the three subprojectors is configured to emit light of a different wavelength.
8 . The head-mounted display of claim 1 , wherein the waveguide comprises at least one input grating positioned adjacent to the light projector, wherein the at least one input grating is configured to enable light from the light projector to enter into the waveguide.
9 . The head-mounted display of claim 1 , wherein the waveguide comprises at least one fiducial mark to facilitate optical location and orientation sensing of the waveguide when assembling the waveguide to the frame.
10 . The head-mounted display of claim 1 , wherein the waveguide is further supported in the frame by an adhesive material.
11 . The head-mounted display of claim 10 , wherein the adhesive material is positioned between the waveguide and the frame in at least three distinct locations.
12 . The head-mounted display of claim 1 , wherein the frame comprises an eyeglasses frame.
13 . An optical assembly, comprising:
a light projector configured to project an image for display to a user, the light projector coupled to a frame; and
a waveguide held laterally in place relative to the frame and to the light projector by at least two flexure elements secured to the frame, each of the at least two flexure elements applying a holding force against a peripheral edge of the waveguide.
14 . The optical assembly of claim 13 , wherein the at least two flexure elements comprise at least three flexure elements each secured to the frame and applying the holding force against the peripheral edge of the waveguide.
15 . The optical assembly of claim 13 , wherein the waveguide comprises at least one input grating optically aligned with at least one respective subprojector of the light projector.
16 . The optical assembly of claim 15 , wherein the waveguide comprises three input gratings optically aligned with three respective subprojectors of the light projector, wherein each of the three subprojectors is configured to project light of a different wavelength.
17 . The optical assembly of claim 13 , wherein each of the flexure elements comprises two flexible arms extending away from a coupling point that secures the flexure element to the frame.
18 . A method of assembling a head-mounted display, the method comprising:
mounting a waveguide to a frame with at least one flexure element coupled to the frame;
laterally moving the waveguide relative to the frame to align at least one input grating of the waveguide with a light projector coupled to the frame; and
fixing the waveguide to the frame in position with the at least one input grating aligned with the light projector.
19 . The method of claim 18 , further comprising optically determining the position and orientation of the waveguide relative to the frame prior to fixing the waveguide to the frame.
20 . The method of claim 18 , wherein the lateral movement of the waveguide flexes the at least one flexure element.