Monocentric autostereoscopic viewing apparatus using resonant fiber-optic image generation

• US 6,550,918 B1
• Filed: 03/19/2002
• Issued: 04/22/2003
• Est. Priority Date: 03/19/2002
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Agostinelli, John A., Cobb, Joshua M.
• Primary Examiner(s): DOWLING, WILLIAM C
• Application Number:
  US10/101,291
• Time in Patent Office: 399 Days
• Field of Search: 353/7, 353/10, 349/15, 359/462, 359/464, 359/471, 359/472, 359/475, 359/477
• US Class Current: 353/7
• CPC Class Codes: G02B 2006/0098 for scanning
• CPC Class Codes: G02B 26/101 with both horizontal and vertical deflecting means, e.g. raster or XY scanners colour television using laser beams scanning a display screen H04N9/3129
• CPC Class Codes: G02B 30/33 involving directional light or back-light sources
• CPC Class Codes: G02B 6/3502 involving direct waveguide displacement, e.g. cantilever type waveguide displacement involving waveguide bending, or displacing an interposed waveguide between stationary waveguides
• CPC Class Codes: G02B 6/3566 involving bending a beam, e.g. with cantilever

Abstract

A substantially monocentric arrangement of optical components provides stereoscopic display of a real image, electronically scanned by resonant actuation of a resonant fiber scanner (137) using a flexible optical waveguide and projected toward a curved retro-reflective surface (124). To form each left and right intermediate image component, separate left and right image generation systems (70) each comprise a resonant fiber scanner (137) that itself comprises a resonant cantilever portion (139) of optical fiber (138) that directs a modulated beam in a curved pattern for projection, such as by a ball lens assembly (30). A monocentric arrangement of optical components images the left and right ball lens pupil at the corresponding left and right viewing pupil (14) of the observer (12) and essentially provides a single center of curvature for projection components. Use of such a monocentric arrangement provides an exceptionally wide field of view with large viewing pupils (14).

Claims

1. A substantially monocentric autostereoscopic optical apparatus for displaying a stereoscopic real image comprising a left image to be viewed by an observer at a left viewing pupil and a right image to be viewed by the observer at a right viewing pupil, said apparatus comprising:

(a) a left image generation system and, similarly constructed;

a right image generation system, wherein each left and right image generation system forms a first intermediate curved image comprising an array of image pixels, with each image generation system comprising;

(a1) a light source for emitting modulated light corresponding to a series of image pixels arranged according to a scan pattern;

(a2) an optical waveguide having an input end coupled to said light source and a flexible output end, said output end emitting said modulated light;

(a3) an actuator for deflecting said flexible output end of said optical waveguide according to said scan pattern;

(a4) a curved surface for forming said first intermediate curved image thereon by receiving said modulated light emitted from said output end of said optical waveguide as deflected by said actuator according to said scan pattern;

(a5) an optical relay element for relaying, onto said curved surface, said modulated light emitted from said flexible output end of said optical waveguide according to said scan pattern, forming said first intermediate curved image thereby;

(b) a left ball lens assembly for projecting said first intermediate curved image from said left image generation system, said left ball lens assembly having a left ball lens pupil;

(c) a right ball lens assembly for projecting said first intermediate curved image from said right image generation system, said right ball lens assembly having a right ball lens pupil;

(d) a retro-reflective surface disposed to form, in cooperation with a beamsplitter, a pseudo-image of said left ball lens pupil at said left viewing pupil and to form a pseudo-image of said right ball lens pupil at said right viewing pupil; and

said stereoscopic real image formed on said retro-reflective surface from said first intermediate curved image from said left image generation system and from said first intermediate curved image from said right image generation system.

2. The autostereoscopic optical apparatus of claim 1 wherein said light source is a laser.

3. The autostereoscopic optical apparatus of claim 1 wherein said light source provides red, green, or blue light.

4. The autostereoscopic optical apparatus of claim 1 wherein said scan pattern is rectilinear.

5. The autostereoscopic optical apparatus of claim 1 wherein said scan pattern is spiral.

6. The autostereoscopic optical apparatus of claim 1 wherein said scan pattern is radial.

7. The autostereoscopic optical apparatus of claim 1 wherein said scan pattern comprises concentric circles.

8. The autostereoscopic optical apparatus of claim 1 wherein said optical waveguide comprises an optical fiber.

9. The autostereoscopic optical apparatus of claim 1 wherein said actuator is piezoelectric.

10. The autostereoscopic optical apparatus of claim 1 wherein said actuator is electromagnetic.

11. The autostereoscopic optical apparatus of claim 1 wherein said actuator is electrodynamic.

12. The autostereoscopic optical apparatus of claim 1 wherein said actuator comprises a motor.

13. The autostereoscopic optical apparatus of claim 1 wherein said curved surface comprises a coating.

14. The autostereoscopic optical apparatus of claim 1 wherein said curved surface is ground to provide diffusive characteristics.

15. The autostereoscopic optical apparatus of claim 1 wherein said curved surface is etched to provide diffusive characteristics.

16. The autostereoscopic optical apparatus of claim 1 wherein said optical relay element comprises a fiber optic faceplate.

17. The autostereoscopic optical apparatus of claim 1 wherein, for said left image generation system, said ball lens assembly and said curved surface share, optically, substantially the same center of curvature.

18. The autostereoscopic optical apparatus of claim 1 wherein, for said right image generation system, said ball lens assembly and said curved surface share, optically, substantially the same center of curvature.

19. The autostereoscopic optical apparatus of claim 1 wherein said left ball lens assembly further comprises at least one meniscus lens.

20. The autostereoscopic optical apparatus of claim 1 wherein said right ball lens assembly further comprises at least one meniscus lens.

21. The autostereoscopic optical apparatus of claim 1 wherein said left ball lens assembly comprises a refractive liquid.

22. The autostereoscopic optical apparatus of claim 1 wherein said right ball lens assembly comprises a refractive liquid.

23. The autostereoscopic optical apparatus of claim 1 wherein said left ball lens assembly comprises a plastic lens element.

24. The autostereoscopic optical apparatus of claim 1 wherein said right ball lens assembly comprises a plastic lens element.

25. The autostereoscopic optical apparatus of claim 1 wherein said retro-reflective surface is essentially spherical.

26. A substantially monocentric autostereoscopic optical apparatus for displaying a stereoscopic real image comprising a left image to be viewed by an observer at a left viewing pupil and a right image to be viewed by the observer at a right viewing pupil, said apparatus comprising a left image generation system and, similarly constructed, a right image generation system, with each image generation system comprising:

(a1) a light source for emitting modulated light corresponding to a series of image pixels arranged according to a scan pattern;

(a2) an optical waveguide having an input end coupled to said light source and a flexible output end, said output end emitting said modulated light;

(a3) an actuator for deflecting said flexible output end of said optical waveguide according to said scan pattern; and

(a4) an optical relay element for relaying said modulated light toward a beamsplitter; and

(b) said beamsplitter folding the light path to direct said modulated light to a retro-reflective surface which thereby forms said stereoscopic real image from said left image generation system and from said right image generation system.

27. The autostereoscopic optical apparatus of claim 26 wherein said light source is a laser.

28. The autostereoscopic optical apparatus of claim 26 wherein said light source provides red, green, or blue light.

29. The autostereoscopic optical apparatus of claim 26 wherein said scan pattern is rectilinear.

30. The autostereoscopic optical apparatus of claim 26 wherein said scan pattern is spiral.

31. The autostereoscopic optical apparatus of claim 26 wherein said scan pattern is radial.

32. The autostereoscopic optical apparatus of claim 26 wherein said scan pattern comprises concentric circles.

33. The autostereoscopic optical apparatus of claim 26 wherein said optical waveguide comprises an optical fiber.

34. The autostereoscopic optical apparatus of claim 26 wherein said actuator is piezoelectric.

35. The autostereoscopic optical apparatus of claim 26 wherein said actuator is electromagnetic.

36. The autostereoscopic optical apparatus of claim 26 wherein said actuator is electrodynamic.

37. The autostereoscopic optical apparatus of claim 26 wherein said actuator comprises a motor.

38. The autostereoscopic optical apparatus of claim 26 wherein said optical relay element comprises a fiber optic faceplate.

39. The autostereoscopic optical apparatus of claim 26 wherein said retro-reflective surface is essentially spherical.

40. The autostereoscopic optical apparatus of claim 26 wherein said retro-reflective surface is essentially cylindrical.

41. The autostereoscopic optical apparatus of claim 26 wherein said retro-reflective surface is essentially flat.

42. A method for display of a stereoscopic real image to an observer, the real image comprising a left image to be viewed by the observer at a left viewing pupil and a right image to be viewed by the observer at a right viewing pupil, the method comprising the steps of:

(a) forming a left image onto a retro-reflective surface comprises;

(a1) emitting a left modulated light corresponding to a series of image pixels arranged according to a left scan pattern;

(a2) directing said left modulated light through a left optical waveguide having a left output end for emitting said left modulated light;

(a3) deflecting said left output end according to said left scan pattern;

(a4) projecting said left modulated light emitted from said left output end toward said retro-reflective surface;

(b) forming a right image onto said retro-reflective surface with the steps of;

(b1) emitting a right modulated light corresponding to a series of image pixels arranged according to a right scan pattern;

(b2) directing said right modulated light through a right optical waveguide having a right output end for emitting said right modulated light;

(b3) deflecting said right output end according to said right scan pattern; and

(b4) projecting said right modulated light emitted from said right output end toward said retro-reflective surface.

43. The method of claim 42 wherein the step of projecting said left modulated light toward said retro-reflective surface comprises the step of projecting said left modulated light through a left ball lens.

44. The method of claim 42 wherein the step of projecting said right modulated light toward said retro-reflective surface comprises the step of projecting said right modulated light through a right ball lens.

45. The method of claim 42 wherein the step of projecting said left modulated light further comprises the step of forming a left intermediate image onto a left diffusive surface for projection.

46. The method of claim 42 wherein the step of projecting said right modulated light further comprises the step of forming a right intermediate image onto a right diffusive surface for projection.