NZ781033B2 - Magnetic joint and optical mount using the same - Google Patents
Magnetic joint and optical mount using the sameInfo
- Publication number
- NZ781033B2 NZ781033B2 NZ781033A NZ78103319A NZ781033B2 NZ 781033 B2 NZ781033 B2 NZ 781033B2 NZ 781033 A NZ781033 A NZ 781033A NZ 78103319 A NZ78103319 A NZ 78103319A NZ 781033 B2 NZ781033 B2 NZ 781033B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- component
- axis
- interface surface
- joint
- magnetic
- Prior art date
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract 43
- 230000003287 optical effect Effects 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims abstract 8
- 239000003302 ferromagnetic material Substances 0.000 claims abstract 4
- 239000011554 ferrofluid Substances 0.000 claims 4
- 230000003993 interaction Effects 0.000 claims 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 claims 1
- 230000005294 ferromagnetic effect Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 229910052594 sapphire Inorganic materials 0.000 claims 1
- 239000010980 sapphire Substances 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
- F16M11/046—Allowing translations adapted to upward-downward translation movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/12—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
- F16M11/121—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction constituted of several dependent joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/12—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
- F16M11/14—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction with ball-joint
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/003—Alignment of optical elements
- G02B7/004—Manual alignment, e.g. micromanipulators
Abstract
laterally unconstrained magnetic joint has a first component comprising a permanent magnet material; and a second component comprising a permanent magnet or ferromagnetic material, where the first component and the second component are magnetically attracted to each other, and where the first component and the second component interface via continuous interface surfaces of different curvature that form and maintain point contact throughout a range of angular and lateral actuation. Movement of the first component is laterally unconstrained with respect to the second component. One or more such magnetic joints can be used in a mount for a payload, such as an wide angle optical mount with three degrees of freedom. The mount may include linear actuators to position the payload.
Claims (29)
1. A laterally unconstrained magnetic joint comprising: a first component extending along a first axis to a first interface surface of a first curvature, the first component comprising a permanent magnet material magnetized along the first axis; and a second component extending along a second axis to a second interface surface of a second curvature, the second component comprising a permanent magnet or a ferromagnetic material, wherein the first component and the second component are magnetically attracted to each other, and wherein the first component and the second component interface via the first and second interface surfaces and maintain point contact throughout a range of angular and lateral actuation; and a linear actuator arranged coaxially with one of the first component or the second component; wherein a magnetic field produced by interaction of the first component with the second component biases the magnetic joint towards an equilibrium position in which the second axis is collinear with the first axis.
2. The laterally unconstrained magnetic joint of claim 1, wherein the first interface surface is planar and the second interface surface is convex.
3. The laterally unconstrained magnetic joint of claim 2, wherein the first interface surface includes a non-magnetic interface material.
4. The laterally unconstrained magnetic joint of claim 1 further comprising a ferrofluid between the first interface surface and the second interface surface.
5. The laterally unconstrained magnetic joint of claim 1, wherein the first component is free to articulate relative to the second component within the constraints of each of the first interface surface and the second interface surface.
6. The laterally unconstrained magnetic joint of any of claims 1-5, wherein the first component is rotationally symmetrical about a first axis and the second component is rotationally symmetrical about a second axis.
7. The magnetic joint of claim 1, wherein the magnetic joint has a range of articulation of at least ±7.5°.
8. A system comprising: a payload having a first surface and an opposite second surface; at least one linear actuator; and a magnetic joint between the payload and the at least one linear actuator, the magnetic joint including a first component with a first body comprising a permanent magnet and defining a first interface surface, wherein a first axis passes through a geometric center of the first interface surface and is perpendicular to the first interface surface; and a second component defining a convex second interface surface in contact with the first interface surface, wherein a second axis passes through a geometric center of the second interface surface and is perpendicular to the second interface surface; wherein a magnetic field produced by interaction of the first component with the second component biases the magnetic joint towards an equilibrium position in which the second axis is collinear with the first axis; wherein a joint axis of the magnetic joint is perpendicular to the first interface surface and to the second interface surface when the magnetic joint is in any position, and the joint axis also passes through the geometric center of each of the first interface surface and the second interface surface when the magnetic joint is in the equilibrium position; and wherein when the magnetic joint is in the equilibrium position, the first axis and the second axis are collinear with the joint axis.
9. The system of claim 8, wherein the first component is magnetically attracted to the second component along a joint axis.
10. The system of claim 9, wherein the second interface surface has a profile that is part of a circle, a parabola, a hyperbola, an ellipse, or a sine wave.
11. The system of claim 8, wherein the first interface surface makes point contact with the second interface surface.
12. The system of claim 8, wherein the at least one actuator includes a first linear actuator coupled to a first magnetic joint and a second linear actuator coupled to a second laterally unconstrained magnetic joint.
13. The system of claim 12 further comprising an additional joint coupled to the payload, wherein the additional joint, the first laterally unconstrained magnetic joint and the second laterally unconstrained magnetic joint are coupled to the first surface of the payload in a triangular arrangement.
14. The system of claim 14, wherein the triangular arrangement defines a right triangle.
15. The system of any one of claims 8-14, wherein the payload comprises a mirror.
16. The system of any one of claims 8-14, wherein the payload has a tilt actuation range of at least 10 degrees.
17. The system of any one of claims 8-16, wherein the first component is rotationally symmetrical about the first axis and the second component is rotationally symmetrical about the second axis.
18. The system of any one of claims 8-17, further comprising a ferrofluid between the first interface and the second interface surface.
19. The system of any one of claims 8-18, wherein the second component comprises a second permanent magnet magnetized along the second axis.
20. The system of any one of claims 8-19, wherein the first component includes a non- magnetic bearing material, the first interface surface being a planar surface of the non- magnetic bearing material.
21. The system of claim 20, wherein the non-magnetic bearing material comprises sapphire and wherein the second interface surface includes a layer of titanium nitride.
22. The system of any one of claims 8-21, wherein the magnetic joint is a first magnetic joint, the system further includes a second magnetic joint, and wherein the at least one actuator includes a first linear actuator coupled to the first magnetic joint and a second linear actuator coupled to the second magnetic joint.
23. The system of claim 22, further comprising an additional joint coupled to the payload, wherein the additional joint, the first magnetic joint, and the second magnetic joint are coupled to the first surface of the payload in a triangular arrangement.
24. A magnetic joint assembly, the assembly comprising: a first component comprising a permanent magnet magnetized along a first axis, the first component having a planar first interface surface intersecting the first axis; a second component comprising a ferromagnetic material and having a convex second interface surface in point contact with the first interface surface, wherein a second axis intersects the second interface surface, wherein the first component and the second component are magnetically attracted to each other along a joint axis that is perpendicular to at least one of the first interface surface and the second interface surface, wherein the first component and the second component maintain point contact throughout a range of angular and lateral actuation, and wherein a magnetic field produced by interaction between the permanent magnet and the ferromagnetic material biases the magnetic joint assembly towards an equilibrium position in which the joint axis is collinear with the first axis and with the second axis.
25. The assembly of claim 24, further comprising a non-magnetic interface material on the first component, the non-magnetic interface material including the first interface surface, and wherein the second component comprises a second permanent magnet magnetized along the second axis and in the same direction as the permanent magnet of the first component.
26. The assembly of claim 24 further comprising a ferrofluid between the first interface surface and the second interface surface, the ferrofluid comprising ferromagnetic particles suspended in a carrier fluid.
27. The assembly of claim 26, wherein the first component has a first cross-sectional size and the second component has a second cross-sectional size that is substantially the same as the first cross-sectional size.
28. A magnetic joint assembly, the assembly comprising: a first component extending along a first axis and comprising a first permanent magnet magnetized along the first axis, the first component having a planar interface surface intersecting the first axis; and a second component extending along a second axis and comprising a second permanent magnet magnetized along the second axis, the second component having a convex second interface surface in point contact with the planar interface surface, the second axis intersecting the convex second interface surface; wherein the first component and the second component are magnetically attracted to each other along a joint axis that is perpendicular to the convex second interface surface, wherein the first component and the second component maintain point contact throughout a range of angular and lateral actuation, and wherein a magnetic field produced by interaction of the first component and the second component biases the assembly towards an equilibrium position in which the joint axis is collinear with the first axis and with the second axis.
29. The assembly of claim 28, wherein the first component has a first cross-sectional area perpendicular to the firs axis and the second component has a second cross-sectional area perpendicular to the second axis, the second cross-sectional area being substantially the same as the first cross-sectional area. Light Steering Technologies, Inc. By the Attorneys for the Applicant SPRUSON & FERGUSON
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2019/021286 WO2020185195A1 (en) | 2019-03-08 | 2019-03-08 | Magnetic joint and optical mount using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ781033A NZ781033A (en) | 2023-12-22 |
| NZ781033B2 true NZ781033B2 (en) | 2024-03-26 |
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