Method and apparatus for monocentric projection of an image

• US 6,755,532 B1
• Filed: 03/20/2003
• Issued: 06/29/2004
• Est. Priority Date: 03/20/2003
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Cobb, Joshua M.
• Primary Examiner(s): MAHONEY, CHRISTOPHER E
• Application Number:
  US10/393,236
• Time in Patent Office: 467 Days
• Field of Search: 353/7, 353/10, 353/30, 359/462, 359/466, 359/471, 359/478-479, 359/629, 359/631, 359/649, 359/727
• US Class Current: 353/7
• CPC Class Codes: G02B 13/08 Anamorphotic objectives
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence

Abstract

A monocentric image generation system (100) for forming a curved image (110) using a spherical mirror (92), a beamsplitter (102) and a ball lens assembly (30) and, optionally, a field lens (112). An image source (94) provides a source image through an aperture stop location (96) at the center of curvature C_s of the spherical mirror (92). The beamsplitter (102) provides the resulting intermediate image (90) so that it is concentric with the ball lens assembly (30) in order to form the curved image (110).

Claims

1. An apparatus for forming a curved image comprising:

(a) a spherical mirror having a mirror center of curvature;

(b) a beamsplitter disposed between the vertex of said spherical mirror and said mirror center of curvature;

(c) an image source for providing image-bearing light to said spherical mirror;

said spherical mirror cooperating with said beamsplitter to form an intermediate image of said image source, said intermediate image having an image center of curvature; and

(d) a ball lens segment, centered at said image center of curvature, for forming the curved image from said intermediate image.

2. An apparatus for forming a curved image according to claim 1 further comprising a field lens disposed near said intermediate image for imaging said mirror center of curvature toward said image center of curvature.

3. An apparatus for forming a curved image according to claim 2 wherein a surface of said field lens is substantially concentric with said mirror center of curvature.

4. An apparatus for forming a curved image according to claim 2 wherein a surface of said field lens is substantially concentric with said image center of curvature.

5. An apparatus for forming a curved image according to claim 1 wherein said ball lens segment comprises a hemispheric lens with a reflective surface.

6. An apparatus for forming a curved image according to claim 1 wherein said ball lens segment comprises at least one meniscus lens segment.

7. An apparatus for forming a curved image according to claim 1 wherein said image source is taken from the group consisting of a CRT, an emissive array, an LCD display.

8. An apparatus for forming a curved image according to claim 1 wherein said beamsplitter comprises a thin glass plate.

9. An apparatus for forming a curved image according to claim 1 wherein said beamsplitter comprises a thin plastic plate.

10. An apparatus for forming a curved image according to claim 1 wherein said beamsplitter comprises a pellicle.

11. An apparatus for forming a curved image according to claim 1 further comprising a focusing optical element adjacent to said image source for directing light toward said mirror center of curvature.

12. An apparatus for forming a curved image according to claim 11 wherein said focusing optical element is from the group consisting of a Fresnel lens, a holographic optical element, a diffraction optical element, and a lens.

13. An apparatus for forming a curved image comprising:

(a) a spherical mirror having a mirror center of curvature;

(b) a beamsplitter disposed between the vertex of said spherical mirror and said mirror center of curvature;

(c) an image source for providing image-bearing light to said spherical mirror;

said spherical mirror cooperating with said beamsplitter to form an intermediate image of said image source, said intermediate image having an image center of curvature;

(d) a field lens disposed near said intermediate image for imaging said minor center of curvature toward said image center of curvature; and

(e) a ball lens segment, centered at said image center of curvature, for forming the curved image from said intermediate image.

14. An apparatus for forming a curved image according to claim 13 wherein said ball lens segment comprises a hemispheric lens with a reflective surface.

15. An apparatus for forming a curved image according to claim 13 wherein said ball lens segment comprises at least one meniscus lens segment.

16. An apparatus for forming a curved image according to claim 13 wherein said image source is taken from the group consisting of a CRT, an emissive array, an LCD display.

17. An apparatus for forming a curved image according to claim 13 wherein a surface of said field lens is substantially concentric with said mirror center of curvature.

18. An apparatus for forming a curved image according to claim 13 wherein a surface of said field lens is substantially concentric with said image center of curvature.

19. An apparatus for forming a curved image according to claim 13 wherein said beamsplitter comprises a thin glass plate.

20. An apparatus for forming a curved image according to claim 13 wherein said beamsplitter comprises a thin plastic plate.

21. An apparatus for forming a curved image according to claim 13 wherein said beamsplitter comprises a pellicle.

22. An apparatus for forming a curved image according to claim 13 further comprising a focusing optical element adjacent to said image source for directing light toward said mirror center of curvature.

23. An apparatus for forming a curved image according to claim 22 wherein said focusing optical element is from the group consisting of a Fresnel lens, a holographic optical element, a diffraction optical element, and a lens.

24. An apparatus for forming a pair of curved images, comprising a left image generation system for forming a left curved image and a right image generation system for forming a right curved image, each image generation system comprising:

(a) a spherical mirror having a mirror center of curvature;

(b) a beamsplitter disposed between the vertex of said spherical mirror and said mirror center of curvature;

(c) an image source for providing image-bearing light to said spherical mirror;

said spherical mirror cooperating with said beamsplitter to form an intermediate image of said image source, said intermediate image having an image center of curvature; and

(d) a ball lens segment, centered at said image center of curvature, for forming the curved image from said intermediate image.

25. An apparatus for forming a curved image according to claim 24 wherein each image generation system further comprises a field lens disposed near said intermediate image for imaging said mirror center of curvature toward said image center of curvature.

26. An apparatus for forming a curved image according to claim 25 wherein a surface of said field lens is substantially concentric with said mirror center of curvature.

27. An apparatus for forming a curved image according to claim 25 wherein a surface of said field lens is substantially concentric with said image center of curvature.

28. An apparatus for forming a curved image according to claim 24 wherein said ball lens segment comprises a hemispheric lens with a reflective surface.

29. An apparatus for forming a curved image according to claim 24 wherein said ball lens segment comprises at least one meniscus lens segment.

30. An apparatus for forming a curved image according to claim 24 wherein said image source is taken from the group consisting of a CRT, an emissive array, an LCD display.

31. An apparatus for forming a curved image according to claim 24 wherein said beamsplitter comprises a thin glass plate.

32. An apparatus for forming a curved image according to claim 24 wherein said beamsplitter comprises a thin plastic plate.

33. An apparatus for forming a curved image according to claim 24 wherein said beamsplitter comprises a pellicle.

34. An apparatus for forming a curved image according to claim 24 further comprising a focusing optical element adjacent to said image source for directing light toward said mirror center of curvature.

35. An apparatus for forming a curved image according to claim 34 wherein said focusing optical clement is from the group consisting of a Fresnel lens, a holographic optical element, a diffraction optical element, and a lens.

36. An apparatus for forming a pair of curved images, comprising a left image generation system for forming a left curved image and a right image generation system for forming a right curved image, each image generation system comprising:

(a) a spherical mirror having a mirror center of curvature;

(b) a beamsplitter disposed between the vertex of said spherical mirror and said mirror center of curvature;

(c) an image source for providing image-bearing light to said spherical mirror;

said spherical mirror cooperating with said beamsplitter to form an intermediate image of said image source, said intermediate image having an image center of curvature;

(d) a field lens disposed near said intermediate image for imaging said mirror center of curvature toward said image center of curvature; and

(e) a ball lens segment, centered at said image center of curvature, for forming the curved image from said intermediate image.

37. An apparatus for forming a curved image according to claim 36 wherein said ball lens segment comprises a hemispheric lens with a reflective surface.

38. An apparatus for forming a curved image according to claim 36 wherein said ball lens segment comprises at least one meniscus lens segment.

39. An apparatus for forming a curved image according to claim 36 wherein said image source is taken from the group consisting of a CRT, an emissive array, an LCD display.

40. An apparatus for forming a curved image according to claim 36 wherein a surface of said field lens is substantially concentric with said mirror center of curvature.

41. An apparatus for forming a curved image according to claim 36 wherein a surface of said field lens is substantially concentric with said image center of curvature.

42. An apparatus for forming a curved image according to claim 36 wherein said beamsplitter comprises a thin glass plate.

43. An apparatus for forming a curved image according to claim 36 wherein said beamsplitter comprises a thin plastic plate.

44. An apparatus for forming a curved image according to claim 36 wherein said beamsplitter comprises a pellicle.

45. An apparatus for forming a curved image according to claim 36 further comprising a focusing optical element adjacent to said image source for directing light toward said mirror center of curvature.

46. An apparatus for forming a curved image according to claim 45 wherein said focusing optical element is from the group consisting of a Fresnel lens, a holographic optical element, a diffraction optical element, and a lens.

47. A method for forming a curved image comprising:

(a) directing an image-bearing light toward a spherical mirror;

(b) forming a curved intermediate image having an intermediate image center of curvature by positioning a beamsplitter between the vertex of said spherical mirror and the center of curvature of said spherical mirror; and

(c) positioning a ball lens segment centered near said intermediate image center of curvature for forming the curved image.

48. A method for forming a curved image according to claim 47 further comprising:

(a) positioning a field lens disposed near said intermediate image for imaging the center of curvature of said spherical mirror toward said intermediate image center of curvature, thereby imaging the center of curvature of said spherical mirror toward the center of curvature of said ball lens segment.

49. A method for forming a curved image according to claim 47 wherein the step of directing an image-bearing light toward a spherical mirror comprises the step of forming an image on a CRT display.

50. A method for forming a curved image according to claim 47 wherein the step of directing an image-bearing light toward a spherical mirror comprises the step of forming an image on an emissive display.

51. A method for forming a curved image according to claim 47 wherein the step of directing an image-bearing light toward a spherical mirror comprises the step of forming an image on an LCD display.

52. A method for forming a curved image according to claim 47 wherein the step of positioning a beamsplitter comprises the step of positioning a pellicle between the vertex of said spherical mirror and the center of curvature of said spherical mirror.

53. A method for forming a curved image according to claim 47 wherein the step of directing an image-bearing light comprises the step of positioning a focusing optical element adjacent to the surface of an image source for providing said image-bearing light as a substantially telecentric beam.