Mechanical joint for use in fiber optic imaging systems

• US 10,481,337 B2
• Filed: 05/29/2018
• Issued: 11/19/2019
• Est. Priority Date: 05/31/2017
• Status: Active Grant

• Current Assignee: Magic Leap, Inc.
• Original Assignee: Magic Leap, Inc.
• Inventors: Zhang, Xiaoyang, Mathur, Vaibhav, Johnson, Michael Robert, Dalrymple, Timothy Mark, Duenner, Andrew C., Carlomagno, Albert Daniel
• Primary Examiner(s): Rahll, Jerry
• Application Number:
  US15/991,851
• Publication Number:
  US 20180348440A1
• Time in Patent Office: 539 Days
• Field of Search: None
• CPC Class Codes: G02B 2027/0187 slaved to motion of at least a part of the body of the user, e.g. head, eye
• CPC Class Codes: G02B 26/103 having movable or deformable optical fibres, light guides or waveguides as scanning elements light guides per se G02B6/00
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 6/262 Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
• CPC Class Codes: G02B 6/3604 Rotary joints allowing relative rotational movement between opposing fibre or fibre bundle ends
• CPC Class Codes: G02B 6/3624 Fibre head, e.g. fibre probe termination optical details of light guide terminations G02B6/241; reshaping of light guides G02B6/2552; optical details of coupling light into or out of fibre end G02B6/262
• CPC Class Codes: G02B 6/3644 the coupling means being through-holes or wall apertures
• CPC Class Codes: G02B 6/3656 the additional structures being micropositioning, with microactuating elements for fine adjustment, or restricting movement, into two dimensions, e.g. cantilevers, beams, tongues or bridges with associated MEMs

Abstract

An example apparatus includes an optical fiber, an actuator, and a joint mechanically coupling the actuator to the optical fiber. The joint includes a neck extending along an axis. The optical fiber is threaded through an aperture extending along the axis through the neck. The optical fiber is attached to the joint at a surface of the neck facing the axis. The joint also includes a collar extending along the axis. The actuator is mechanically attached to the joint at an inner surface of the collar facing the axis. The joint also includes a flexural element extending radially from the neck to the collar. During operation, the joint couples a force from the actuator to the optical fiber to vary an orientation of a portion of the optical fiber extending from the neck with respect to the axis.

Claims

1. An apparatus, comprising:

an optical fiber;

an actuator; and

a joint mechanically coupling the actuator to the optical fiber, the joint comprising;

a neck extending along an axis, the optical fiber being threaded through an aperture extending along the axis through the neck, wherein the optical fiber is attached to the joint at a surface of the neck facing the axis,

a collar extending along the axis, wherein the actuator is mechanically attached to the joint at an inner surface of the collar facing the axis, and

a flexural element extending radially from the neck to the collar, wherein the flexural element comprises one or more beams extending between the neck and the collar, and

wherein during operation, the joint couples a force from the actuator to the optical fiber to vary an orientation of a portion of the optical fiber extending from the neck with respect to the axis.

2. The apparatus of claim 1, wherein the flexural element comprises an annular portion extending between the neck and the collar.

3. The apparatus of claim 1, wherein the collar extends along the axis in a direction away from the neck.

4. The apparatus of claim 1, wherein the collar extends along the axis about a periphery of the neck.

5. The apparatus of claim 1, wherein the joint is rotationally symmetric about the axis.

6. The apparatus of claim 5, wherein the joint has at least four-fold rotational symmetry about the axis.

7. The apparatus of claim 1, wherein the joint has a first stiffness with respect to the axis, a second stiffness with respect to a first radial direction, and a third stiffness with respect to a second radial direction orthogonal the first radial direction, and

wherein the first stiffness is greater than the second stiffness and the third stiffness.

8. The apparatus of claim 7, wherein the second stiffness and the third stiffness are substantially equal.

9. The apparatus of claim 1, wherein the joint comprises crystalline silicon.

10. The apparatus of claim 9, wherein the crystalline silicon has a (111) crystal structure.

11. The apparatus of claim 1, wherein the joint comprises amorphous silicon.

12. The apparatus of claim 1, wherein the joint comprises one or more layers of silicon and one or more layers of electrically insulative material.

13. The apparatus of claim 12, wherein the electrically insulative material comprises silicon dioxide.

14. The apparatus of claim 1, wherein the neck has a substantially circular cross-section.

15. The apparatus of claim 14, wherein the neck has an inner diameter less than 200 μ

m.

16. The apparatus of claim 14, wherein the neck has an outer diameter less than 300 μ

m.

17. The apparatus of claim 1, wherein the neck defines one or more slots along a periphery of the neck.

18. The apparatus of claim 1, wherein the collar has a substantially circular cross-section.

19. The apparatus of claim 18, wherein the collar has an inner diameter less than 1500 μ

m.

20. The apparatus of claim 18, wherein the collar has an outer diameter less than 2000 μ

m.

21. The apparatus of claim 1, wherein the collar defines one or more slots along a periphery of the collar.

22. The apparatus of claim 1, further comprising an illumination source in optical communication with the optical fiber, wherein the illumination source is configured, during operation, to direct light into the optical fiber.

23. The apparatus of claim 22, wherein the actuator is configured, during operation, to vary the orientation of the portion of the optical fiber such that a first end of the optical fiber traverses a pre-defined pattern.

24. The apparatus of claim 23, wherein the optical guide is configured, during operation, to receive light from the illumination source, guide the received light to an end of the optical fiber, and emit the received light from the first end of the optical fiber.