Moving mirror optical scanner and associated methods
View Patent ↗An apparatus and method for an optical scanner comprises a mirror, a coil, a magnetic circuit, and a support connected to the mirror. The mirror has a reflective surface and a periphery. A coil of electrically conductive material consists of a plurality of windings around the periphery of the mirror. The magnetic circuit comprises a magnet having opposite poles generating a magnetic flux therebetween. A support is connected to the mirror, the support rotatably supporting the mirror in the magnetic flux with the magnetic flux intersecting the coil.
1. An optical scanner comprising:
a reflective body having a generally planar reflective surface;
a coil of electrically conductive material on said reflective body, said coil including a plurality of windings around a periphery of said reflective body, said coil being connectable to a power source;
a magnetic circuit having at least one magnet and a pair of magnetically permeable pole pieces, each pole piece of the pair abutting a pole of said at least one magnet, the pair being spaced apart generally opposite each other so as to generate a magnetic flux therebetween; and
one or more supports whereby said reflective body is rotatably supported relative to said pair of pole pieces having the magnetic flux intersecting said coil.
2. The optical scanner of claim 1 , wherein said reflective body comprises a mirror.
3. The optical scanner of claim 1 , wherein said reflective body comprises a material selected from glass, metal, ceramic, and semiconductor.
4. The optical scanner of claim 1 , wherein said reflective body comprises a ferrite material.
5. The optical scanner of claim 1 , wherein said reflective body is formed at least partially from powdered metal.
6. The optical scanner of claim 1 , wherein said reflective body comprises silicon.
7. The optical scanner of claim 1 , wherein said reflective body comprises at least one non-metallic material.
8. The optical scanner of claim 1 , wherein said reflective body comprises at least one metallic material.
9. The optical scanner of claim 1 , further comprising a magnetically permeable material between said reflective body and said coil.
10. The optical scanner of claim 1 , wherein said reflective body comprises a geometric feature effective for retaining said plurality of windings in position.
11. The optical scanner of claim 10 , wherein said geometric feature is selected from a convexity, a groove, and a notch.
12. The optical scanner of claim 1 , wherein said coil comprises wire selected from copper, silver, and aluminum.
13. The optical scanner of claim 1 , wherein said one or more supports comprises a bearing.
14. The optical scanner of claim 1 , wherein said one or more supports are selected from a flexural pivot and a cross-flexure.
15. An optical scanner comprising:
a mirror having a reflective surface and a periphery;
a coil of electrically conductive material, said coil comprising a plurality of windings on a periphery of said mirror;
a magnetic circuit comprising a magnet having opposite poles generating a magnetic flux therebetween; and
a support connected to said mirror, said support rotatably supporting said mirror in the magnetic flux with the magnetic flux intersecting said coil.
16. The optical scanner of claim 15 , wherein said mirror comprises a material selected from glass, metal, ceramic, and semiconductor.
17. The optical scanner of claim 15 , wherein said mirror comprises a ferrite material.
18. The optical scanner of claim 15 , wherein said mirror is formed at least partially from powdered metal.
19. The optical scanner of claim 15 , wherein said mirror comprises silicon.
20. The optical scanner of claim 15 , wherein said mirror comprises at least one non-metallic material.
21. The optical scanner of claim 15 , wherein said mirror comprises at least one metallic material.
22. The optical scanner of claim 15 , further comprising a magnetically permeable material between said mirror and said coil.
23. The optical scanner of claim 15 , wherein said mirror comprises a geometric feature effective for retaining said plurality of windings in position.
24. The optical scanner of claim 23 , wherein said geometric feature is selected from a convexity, a groove, and a notch.
25. The optical scanner of claim 15 , wherein said coil comprises wire selected from copper, silver, and aluminum.
26. The optical scanner of claim 15 , wherein said one or more supports comprises a bearing.
27. The optical scanner of claim 15 , wherein said one or more supports are selected from a flexural pivot and a cross-flexure.
28. A method of scanning a light beam, the method comprising;
providing the optical scanner of claim 15 ;
applying an alternating electrical current to the coil so as to cause the mirror to rotate responsive to interaction between the alternating current and the magnetic flux; and
reflecting the beam from the reflective surface of the rotating mirror.
29. A method of scanning a light beam, the method comprising:
providing a mirror having a reflective surface and a periphery;
winding a coil of electrically conductive material on the periphery of said mirror;
generating a magnetic flux between opposite poles of a magnet;
rotatably supporting the mirror in the flux on one or more supports so that the flux intersects the coil;
rotating the mirror by applying an alternating electrical current to the coil so as to cause the mirror to rotate on said one or more supports responsive to electrical interaction with the magnetic flux; and
reflecting the beam from the reflective surface of the rotating mirror.
30. The method of claim 29 , wherein said mirror comprises a material selected from glass, metal, ceramic, and semiconductor.
31. The method of claim 29 , wherein said mirror comprises a ferrite material.
32. The method of claim 29 , wherein said mirror is formed at least partially from powdered metal.
33. The method of claim 29 , wherein said mirror comprises silicon.
34. The method of claim 29 , wherein said mirror comprises at least one non-metallic material.
35. The method of claim 29 , wherein said mirror comprises at least one metallic material.
36. The method of claim 29 , further comprising positioning a magnetically permeable material between said mirror and said winding.
37. The method of claim 29 , further comprising positioning on said mirror a geometric feature effective for retaining said plurality of windings in position.
38. The optical scanner of claim 37 , wherein said geometric feature is selected from a convexity, a groove, and a notch.
39. The method of claim 29 , wherein said coil comprises wire selected from copper, silver, and aluminum.
40. The method of claim 29 , wherein said one or more supports comprises a bearing.
41. The method of claim 29 , wherein said one or more supports are selected from a flexural pivot and a cross-flexure.