Illumination system and method for a high definition light microscope

• US 5,345,333 A
• Filed: 04/19/1991
• Issued: 09/06/1994
• Est. Priority Date: 04/19/1991
• Status: Expired due to Fees

• Current Assignee: Agency For Science Technology and Research (Government of Singapore)
• Original Assignee: Unimat (USA) Corporation
• Inventors: Greenberg, Gary
• Primary Examiner(s): Ben, Loha
• Assistant Examiner(s): NGUYEN, THONG Q
• Application Number:
  US07/688,170
• Time in Patent Office: 1,236 Days
• Field of Search: 359/368-374, 359/385-390, 359/637, 359/728, 351/206, 351/211, 356/400, 356/401
• US Class Current: 359/389
• CPC Class Codes: G02B 21/086 for transillumination only
• CPC Class Codes: G02B 21/22 Stereoscopic arrangements
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre

Abstract

An illumination system and method for increasing resolution, sharpness, depth of field, and perception of depth for a transmitted light microscope including a condenser lens having an optical axis, objective lens having an optical axis, and an eye piece wherein a light beam path shift enables two or more separate light beams to be directed onto the condenser along paths that are not coincident with the condenser lens optical axis and that produce beam exit paths from the condenser lens which are at maximum oblique angles relative to the objective lens axis which are within the objective lens aperture.

Claims

1. An illumination system for a transmitted light microscope including a condenser lens means having an optical axis and objective lens means having an optical axis, comprising in combination:

light beam source means located off the optical axis of the condenser lens means for providing a light beam along a source beam path that passes through the condenser lens means; and

beam path shift means operable to shift the source beam path to be non-parallel to the optical axis of the condenser lens means.

2. The invention of claim 1 wherein said light beam source means provides a plurality of independent light beams along source beam paths that pass through the condenser lens means, and said beam path shift means shifts a plurality of source beam paths.

3. An illumination system for a transmitted light microscope including a condenser lens means having an optical axis and objective lens means having an optical axis, comprising in combination:

light beam source means for providing a light beam along a source beam path that is non-coincident with the optical axis of the condenser lens means; and

beam path shift means disposed off the optical axis of the condenser lens means in said source beam path, said beam path shift means operable to shift the path of said source means light beam and redirect it along an incident path that passes through the condenser lens means, and an exit path from the condenser lens means that passes through the objective lens means, wherein the path between the condenser lens means and the objective lens means is oblique to the optical axis of the objective lens means.

4. The invention of claim 3 wherein said shift means is operable to variably alter the direction of the path of the light beam to the condenser lens means over a range that produces exit paths from the condenser lens means that pass through the objective lens means.

5. The invention of claim 3 wherein said light beam shift means is operable to variably alter both the location and the angle of the exit beam path from the condenser lens means.

6. The invention of claim 5 wherein said light beam shift means is operable to independently vary the location and the angle of the exit beam path.

7. The invention of claim 6 wherein said light beam shift means comprises a mirror angularly moveable relative to said source means light beam, and laterally movable relative to the optical axis of the condenser lens means.

8. The invention of claim 6 wherein the condenser lens means includes a pre-condenser lens means.

9. The invention of claim 8 wherein the pre-condenser lens means further includes a field stop iris.

10. An illumination system for a transmitted light microscope including a condenser lens means having an optical axis, and an objective lens means having an optical axis, comprising in combination:

light beam source means for providing a plurality of independent light beams along different source beam paths which are non-coincident with the optical axis of the condenser lens means; and

a plurality of light beam shift means each of which is operable to shift the path of a source means light beam and redirect it along an incident path that passes through the condenser lens means, and an exit path from the condenser lens means that passes through the objective lens means, wherein the exit path is oblique to the optical axis of the objective lens means.

11. The invention of claim 10 wherein said light beam shift means are operable to variably alter the direction of the path of their associated light beam to the condenser lens means over a range that produces exit paths from the condenser means that passes through the objective lens means.

12. The invention of claim 11 wherein said light beam shift means are operable to variably alter both the locations and angle of the exit beam paths from the condenser.

13. The invention of claim 11 wherein said light beam shift means are independently operable.

14. The invention of claim 11 wherein said light beam shift means are operably interconnected whereby the operation of one to vary the path of its associated light beam causes a variation in the path of the light beam associated with each of the other light beam shift means.

15. The invention of claim 10 wherein each of said light beam shift means is fixed to create a single exit path from said condenser lens means.

16. The invention of claim 10 wherein the condenser lens means includes a pre-condenser lens optically disposed in the incident paths of beams from said shift means to the condenser lens means.

17. The invention of claim 16 wherein lens is physically movable relative to said condenser lens means.

18. The invention of claim 16 wherein said pre-condenser lens means further includes an associated field stop iris.

19. The invention of claim 10 wherein the number of light beams and the number of said light beam shift means is two.

20. The invention of claim 19 wherein the illumination system further includes means for supporting a specimen at a specimen plane between the condenser lens means and the objective lens means, and wherein said shift means are operable to establish light beam paths which at the specimen plane are at essentially right angles to each other.

21. The invention of claim 19 wherein the illumination system further includes means for supporting a specimen at a specimen plane between the condenser lens means and the objective lens means, and wherein said light beams are essentially 180 degrees apart in opposing relationship to one another at the location of the specimen plane.

22. The invention of claim 19 further comprising complementary filters disposed between said source means and condenser lens means.

23. The invention of claim 22 wherein said filters are plane polarizers.

24. The invention of claim 22 wherein said filters are circular polarizers.

25. The invention of claim 22 wherein said filters are complementary colors.

26. The invention of claim 22 wherein the system further includes an eyepiece lens means disposed to receive light from the objective lens means and wherein the invention further comprises complementary filters optically disposed between the objective lens means and the eyepiece lens means.

27. The invention of claim 10 wherein the number of independent light beams and the number of said light beam shift means is three.

28. The invention of claim 27 wherein the illumination system further includes means for supporting a specimen at a specimen plane between the condenser lens means and the objective lens means and wherein said exit beam paths are evenly angularly spaced from one another at the specimen plane.

29. The invention of claim 27 wherein the system further includes an eyepiece lens means disposed to receive light from the objective lens means and wherein the invention further comprises polarizing filters optically disposed between said source means and said condenser lens means and a polarizing filter optically disposed between the objective lens means and the eyepiece lens means.

30. The invention of claim 27 further comprising a zoom lens optically disposed between said source means and said shift means.

31. The invention of claim 27 wherein said beam path shift means comprises three mirrors disposed about the optical axis of the condenser lens means and in the source beam paths, said mirrors movable along paths that are radial relative to the optical axis of the condenser lens means and angular relative to the source beam paths.

32. The invention of claim 31 wherein the movement of one of said mirrors is independent of the others.

33. The invention of claim 31 wherein the movement of one of said mirrors causes movement in the others.

34. The invention of claim 27 wherein the different source beam paths include fiber optic means and said beam path shift means includes fiber optic position means.

35. The invention of claim 10 wherein said light beam shift means include mirror surfaces.

36. The invention of claim 10 wherein said light beam shift means include fiber optics.

37. The invention of claim 10 wherein the number of independent light beams is four.

38. The invention of claim 10 wherein the number of independent light beams is six.

39. An illumination system for a transmitted light microscope including a condenser lens means having an optical axis, and an objective lens means having an optical axis, comprising in combination:

light beam source means for providing a plurality of independent light beams along different source beam paths to the condenser lens means;

a plurality mirror surfaces optically disposed in source beam paths wherein each said mirror surface is movable radially relative to the optical axis of the condenser means and angularly relative to its associated source beam, wherein said mirror surfaces are movable to positions along radial paths in which they do not intersect the condenser means optical axis whereby said mirror surfaces are operable to direct source beams onto the condenser lens means at locations thereon which are determined by the radial and angular positions of said mirror surfaces.

40. The invention of claim 39 wherein at least one of said mirror surfaces is movable radially to a position in which said mirror surface intersects the optical axis of the condenser lens means.

41. The invention of claim 39 in which the movement of said mirror surfaces is interdependent on each other.

42. The invention of claim 39 in which the movement of said mirror surfaces independent of each other.

43. The invention of claim 39 in which the movement of said mirror surfaces selectably independent of each other and interdependent on each other.

44. The invention of claim 39 wherein the range of movement of each mirror surface produces a path that passes through the objective lens means.

45. The invention of claim 39 wherein the range of movement of each mirror surface produces paths that pass through and pass by the objective lens means.

46. The invention of claim 39 wherein the condenser lens means includes a pre-condenser lens means.

47. The invention of claim 46 wherein the pre-condenser lens means further includes a field stop iris.

48. A method of increasing resolution in a transmitted light microscope having a condenser lens means having an optical axis, and an objective lens means having an optical axis, comprising the steps of:

directing a plurality of independent light beams onto the condenser lens means along paths that are not coincident with the condenser lens means optical axis;

adjusting the direction of the paths of the light beams to the condenser lens means until the light beams that exit the condenser lens means are directed along paths that pass through the objective lens means and are oblique relative the optical axis of the objective lens means.

49. The method of claim 48 wherein the directions of the paths of the light beams onto the condenser lens means are adjusted until the light beams that exit the condenser lens means are directed along paths that are at maximum angle relative to the optical axis of the objective lens means and also pass through the objective lens means.

50. The method of claim 48 wherein the number of beams is two.

51. The method of claim 50 wherein the beams are directed along paths that are essentially 90 degrees apart.

52. The method of claim 50 wherein the beams are directed along paths that are essentially 180 degrees apart.

53. The method of claim 48 wherein the number of beams is more than two and they are positioned circumferentially about the optical axis of the condenser lens means.

54. A method for real-time 3-D imaging with increased resolution in a transmitted light microscope having an condenser lens means having an optical axis, an objective lens means having an optical axis, a source means of source light beams and a binocular eyepiece means, comprising the steps of:

directing two independent light beams from the source means into the condenser lens means along paths that are not coincident with the condenser lens means optical axis and which produce exit beam paths from the condenser lens means which are oblique to the optical axis of the objective lens means and which pass through the objective lens means,

disposing complementary filters between the source means and the condenser lens means; and

disposing another set of complimentary filters on the binocular eyepiece means.

55. The method of claim 54 further comprising the step of adjusting the location and angle of the source beam path between the source means and the condenser means to control parallax.

56. The method of claim 54 wherein the condenser lens means is further described as including a pre-condenser lens means lens and iris diaphragm having an iris aperture, further comprising the step of adjusting the iris aperture to adjust depth of field.

57. In an illumination system for a transmitted light microscope having a condenser lens means with an optical axis, and an objective lens means with an optical axis, the combination comprising:

light means for providing a plurality of independent light beams having paths which are oblique with respect to the optical axis of the condenser lens means, and which pass through both the condenser lens means and the objective lens means, wherein the paths of the beams between the condenser lens means and the objective lens means are oblique to the optical axis of the objective lens means.

58. The invention of claim 57 wherein the number of beams is 3.

59. The invention of claim 57 wherein the number of beams is 4.

60. The invention of claim 57 wherein the number of beams is 6.

61. An illumination system for a transmitted light microscope having a condenser lens means with an optical axis, and an objective lens means with an optical axis, comprising:

light means providing a plurality of independent light beams each having an optical axis which lies along a path which is non-coincident with the optical axis of the condenser lens means, which independent light beams overlap at the condenser lens means and which independent light beams pass through both the condenser lens means and the objective lens means, wherein the paths of the optical axes of the independent light beams between the condenser lens means and the objective lens means are oblique to the optical axis of the objective lens means.

62. The invention of claim 61 wherein the number of independent light beams is 3.

63. The invention of claim 61 wherein the number of independent light beams is 4.

64. The invention of claim 61 wherein the number of independent light beams is 6.