Omni-directional imaging and illumination assembly

• US 7,570,437 B2
• Filed: 10/27/2003
• Issued: 08/04/2009
• Est. Priority Date: 11/04/2002
• Status: Expired due to Fees

• Current Assignee: Mistral Detection Ltd.
• Original Assignee: O.D.F. Medical Ltd., O.D.F. Optronics Ltd.
• Inventors: Liteyga, Gennadiy, Graisman, Gil, Gal, Ehud
• Primary Examiner(s): Lester; Evelyn A.
• Application Number:
  US10/530,459
• Publication Number:
  US 20060152819A1
• Time in Patent Office: 2,108 Days
• Field of Search: 359/648, 359/708, 359/710, 359/718, 359/725
• US Class Current: 359/725
• CPC Class Codes: G02B 13/06 Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
• CPC Class Codes: G03B 2215/0582 Reflectors
• CPC Class Codes: G03B 37/06 involving anamorphosis G03B37/02, G03B37/04 take precedence

Abstract

In a first aspect, the present invention provides an omni-directional imaging assembly. In the preferred embodiment the assembly of the invention comprises a solid omni-directional lens comprising a vertical axis of symmetry; an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens; a transparent perimeter surface; a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of the perimeter surface; and a transparent circular surface maintained in the lower convex surface around the vertical axis of symmetry. The light rays from a first 360 degrees, panoramic, scene are refracted by the transparent perimeter surface, are then reflected by the lower convex surface towards the upper surface, and then reflected by the upper surface towards the transparent circular surface, where they are refracted and exit the omni-directional lens. In a second aspect the omni-directional imaging assembly of the invention can be combined with an illumination source to simultaneously provide both omni-directional imaging and omni-directional illumination. Also described are embodiments of the invention that comprise image capturing devices, embodiments that enable simultaneous imaging of the first scene and a second scene, and embodiments that are adapted to the requirements of endoscopic imaging.

Claims

1. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens; and

wherein the curvature of the upper surface and/or the curvature of the lower convex surface of said omni-directional lens and the material of which said omni-directional lens is made are selected to enable Total Internal Reflection of rays that arrive at said surfaces, without the use of a reflective coating.

2. An omni-directional imaging assembly according to claim 1, further comprising an illumination source located adjacent to the transparent area in the lower convex surface, said illumination source distributing illumination towards the interior of the omni-directional lens, which refracts and reflects said illumination rays distributing them omni-directionally, thereby providing omni-directional illumination.

3. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens;

said omni-directional imaging assembly further comprising a second transparent circular area maintained in the upper surface of the omni-directional lens around the vertical axis of symmetry;

said second transparent circular area enabling penetration of rays from a second scene, at least partially different than the first scene, into said omni-directional lens, wherein rays from said second scene travel through said omni-directional lens, are refracted by the transparent circular surface in the lower surface, and exit said omni-directional lens.

4. An omni-directional imaging assembly according to claim 3, further comprising an optical structure located coaxially with the omni-directional lens and above the upper surface of said lens;

said optical structure comprising refracting and/or reflecting surfaces having curvatures that control and enhance the optical qualities of the second scene, before rays originating in said second scene are refracted by the second transparent circular area.

5. An omni-directional imaging assembly according to claim 4, wherein the optical structure comprises refracting and/or reflecting surfaces having curvatures that control the aperture of the second scene.

6. An omni-directional imaging assembly according to claim 4, wherein the optical structure comprises a plurality of optical elements.

7. An omni-directional imaging assembly according to claim 3, further comprising a hole extending from the upper surface of the omni-directional lens to the lower convex surface around the vertical axis of symmetry, wherein said hole has a diameter that allows rays from the second scene to travel through said hole thereby passing through said omni-directional lens.

8. An omni-directional imaging assembly according to claim 7, further comprising an optical element placed within the hole, wherein said optical element comprises refracting and/or reflecting surfaces having curvatures that control the quality of the image of the second scene.

9. An omni-directional imaging assembly according to claim 8, wherein the outside surface of the optical element that is placed in the hole is coated with black coating to absorb light and prevent glare.

10. An omni-directional imaging assembly according to claim 7, wherein the surface of the hole is coated with black coating to absorb light and prevent glare.

11. An omni-directional imaging assembly according to claim 7, wherein the hole is cylindrical in shape.

12. An omni-directional imaging assembly according to claim 7, wherein the hole is conical in shape.

13. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

Wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens;

said omni-directional imaging further comprising an image capture device, directed towards the transparent circular surface in the lower surface of the omni-directional lens and having its optical axis coinciding with the vertical axis of symmetry of said omni-directional lens and a connector located between the omni-directional lens and the image capture device, said connector having a first edge and a second edge, wherein optical transparency exists between said first edge and said second edge, allowing light penetrating said first edge to reach and exit through said second edge essentially without distortion.

14. An omni-directional imaging assembly according to claim 13, wherein the second edge of the connector is connected to the image capture device.

15. An omni-directional imaging assembly according to claim 13, wherein the distance between the first edge of the connector and the second edge allows optimal focus by the image capture device of the image that arrives from the direction of the omni-directional lens.

16. An omni-directional imaging assembly according to claim 13, wherein the connector is fabricated together with, and as a part of, the omni-directional lens as a unified optical block.

17. An omni-directional imaging assembly according to claim 13, wherein the side edges of the connector have a transparent volume allowing rays that arrive from the second edge to travel through said side edges, to exit through the first edge, and to enter the omni-directional lens.

18. An omni-directional imaging assembly according to claim 17, further comprising an illumination source located adjacent to the second edge of the connector, said illumination source transmitting illumination towards the transparent volume of said connector;

wherein illumination rays travel through said transparent volume of said connector, penetrate the omni-directional lens, and are distributed omni-directionally by the reflective and refractive surfaces of said omni-directional lens, thereby providing omni-directional illumination.

19. An omni-directional imaging assembly according to claim 18, wherein the illumination source comprises a plurality of illumination sources.

20. An omni-directional imaging assembly according to claim 19, wherein the illumination source is capable of illumination at several different wavelengths.

21. An omni-directional imaging assembly according to claim 18, wherein the fabrication material and coating material of the omni-directional lens are transparent to the spectral range of the illumination.

22. An omni-directional imaging assembly according to claim 13, wherein the outer surface of the side of the connector is blackened by a coating or by the presence of a mechanical element, thereby absorbing light and preventing glare.

23. An omni-directional imaging assembly according to claim 13, wherein the connector is cylindrical in shape.

24. An omni-directional imaging assembly according to claim 13, wherein the first edge of the connector is connected to the omni-directional lens.

25. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

Wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens;

said omni-directional imaging assembly further comprising cylindrical slots in the body of the omni-directional lens around the axis of symmetry, said slots formed in size and angle so as to not interfere with the optical path of rays originating in scenes that should be covered by said omni-directional lens;

wherein said slots absorb light and prevent glare.

26. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens;

said omni-directional imaging assembly further comprising a prism and an illumination source;

wherein said prism is located coaxially with the omni-directional lens and said illumination source is located to the side of said prism and directed towards said prism;

wherein the shape of said prism, the reflectivity of its surfaces, and its location and orientation are selected so as to transmit rays that arrive from the direction of said omni-directional lens to the desired location and to refract illumination rays originating at said illumination source towards said omni-directional lens.

27. An omni-directional imaging assembly comprising a solid omni-directional lens said omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens; and

wherein the omni-directional lens further comprises a hole to the side of the vertical axis of symmetry, said hole extending from the upper surface to the lower surface of said lens;

wherein said hole comprises a mechanical channel.

28. An omni-directional imaging assembly according to claim 27, wherein the dimensions and location of the mechanical channel allow the passage of gases, liquids, or mechanical devices for cleaning the exterior of the omni-directional lens.

29. An omni-directional imaging assembly according to claim 27, wherein the dimensions and location of the mechanical channel allow the passage of surgical instruments through the omni-directional lens.

30. An omni-directional imaging assembly comprising a solid omni-directional lens omni-directional lens comprising:

(a) a vertical axis of symmetry;

(b) an upper surface, at least part of which is capable of reflecting rays that arrive from the inner side of the omni-directional lens;

(c) a transparent perimeter surface;

(d) a lower convex surface, at least part of which is capable of reflecting rays that arrive from the direction of said perimeter surface;

(e) a transparent circular surface maintained in said lower convex surface around said vertical axis of symmetry;

wherein light rays from a first 360 degrees, panoramic, scene are refracted by said transparent perimeter surface, are then reflected by said lower convex surface towards said upper surface, and then reflected by said upper surface towards said transparent circular surface, then refracted and exit said omni-directional lens;

further comprising an image capture device, directed towards the transparent circular surface in the lower surface of the omni-directional lens and having its optical axis coinciding with the vertical axis of symmetry of said omni-directional lens.

31. An omni-directional imaging assembly according to claim 30, further comprising an image capture device located above and adjacent to said upper surface, directed opposite to the omni-directional lens, said image capture device capturing images of an additional scene, at least partially different from the first scene.