Waveguide display with cantilevered light scanner
This disclosure includes a description of a pair of virtual or augmented reality glasses that includes an optical scanning system that protrudes at least partially through an opening in an eyepiece of the glasses. The optical scanning system includes an optical fiber or cantilevered beam that extends through the opening and a transducer that drives the optical fiber or cantilevered beam to move in a spiral pattern.
1. A head mounted display with an optical scanner comprising:
a frame;
a hub;
at least one transducer coupled to the frame and to the hub; and
a cantilever including a proximal end coupled to the hub and a light-emitting free distal end, wherein the at least one transducer extends in a direction perpendicular to the cantilever from the hub to the frame.
2. The optical scanner of claim 1 further comprising at least one flexure coupling the frame to the hub.
3. The optical scanner of claim 2 wherein the at least one flexure includes a plurality of flexures coupling the frame to the hub.
4. The optical scanner of claim 2 wherein the frame, the hub and the at least one flexure are integrally formed.
5. The optical scanner of claim 4 wherein the at least one flexure has at least a first thickness and the hub has at least a second thickness, wherein the second thickness is greater than the first thickness and the first thickness and the second thickness are measured in a direction parallel to a rest position of a longitudinal axis of the cantilever.
6. The optical scanner of claim 2 wherein the at least one flexure extends from the hub to the frame and extends in a direction that is radial with respect to a rest position of a longitudinal axis of the cantilever.
7. The optical scanner of claim 1 wherein the hub is annular in shape, defining a hole, and the proximal end of the cantilever is secured in the hole.
8. The optical scanner of claim 1 wherein the at least one transducer includes a plurality of transducers.
9. The optical scanner of claim 1 wherein the at least one transducer includes a piezoelectric transducer.
10. The optical scanner of claim 1 wherein the at least one transducer comprises a heater including material that exhibits a property of expanding when heated.
11. The optical scanner of claim 1 wherein the at least one transducer has an elongated shape and a longitudinal axis of the at least one transducer extends substantially radially with respect to a rest position of a longitudinal axis of the cantilever.
12. The optical scanner of claim 1 wherein the cantilever comprises a fiber optic.
13. The optical scanner of claim 1 wherein the proximal end has a larger transverse dimension than the light-emitting free distal end.
14. Augmented reality glasses comprising:
a frame;
a hub;
an eyepiece including an incoupling grating, a hole formed in the incoupling grating of the eyepiece;
a transducer coupled to the frame and to the hub capable of generating mechanical movement;
a cantilever including a proximal end coupled to the transducer and a distal end, wherein the transducer extends in a direction perpendicular to the cantilever from the hub to the frame; and
a light-emitting member disposed on the cantilever, wherein the cantilever extends through the hole formed in the incoupling grating of the eyepiece.
15. The augmented reality glasses of claim 14 further comprising a waveguide arranged along the cantilever, wherein the light-emitting member includes a tip of the waveguide.
16. The augmented reality glasses of claim 14 wherein the cantilever comprises an optical waveguide and the light-emitting member includes an emitting, distal end of the optical waveguide.
17. The augmented reality glasses of claim 16 wherein the transducer comprises a piezoelectric tube and the optical waveguide extends through the piezoelectric tube.
18. The augmented reality glasses of claim 14 further comprising:
a reflective surface arranged facing the light-emitting member; and
a lens disposed between the reflective surface and the incoupling grating.
19. The augmented reality glasses of claim 18 wherein the lens includes a central hole and the cantilever extends through the central hole in the lens.
20. The augmented reality glasses of claim 18 wherein the reflective surface and the lens, in combination, are configured to collimate light emitted by the light-emitting member.