Diffuse reflective illuminator
An apparatus including a curved light-reflecting surface including a pair of opposing curved edges and a pair of opposing longitudinal edges that extend between corresponding endpoints of the opposing curved edges; a pair of reflective surfaces, each reflective surface being attached to a corresponding one of the curved edges; at least one flange coupled to one of the pair of longitudinal edges and projecting toward the opposing longitudinal edge; and at least one light source mounted on the at least one flange. Other embodiments and aspects are also disclosed and claimed.
1. An apparatus comprising:
a curved light-diffusing surface including a pair of opposing curved edges and a pair of opposing longitudinal edges that extend between corresponding endpoints of the opposing curved edges;
a pair of specular reflective surfaces, each specular reflective surface being attached to a corresponding one of the curved edges;
at least one flange coupled to one of the pair of longitudinal edges and projecting toward the opposing longitudinal edge; and
at least one light source mounted on the at least one flange.
2. The apparatus of claim 1 wherein the light-diffusing surface has a light-diffusing coating thereon.
3. The apparatus of claim 1 wherein the pair of specular reflective surfaces are planar and are parallel to each other.
4. The apparatus of claim 1 wherein the pair of opposing longitudinal edges are co-planar.
5. The apparatus of claim 1 , further comprising an imaging aperture in the light-diffusing surface.
6. The apparatus of claim 1 wherein the light-diffusing surface is smooth and continuous.
7. The apparatus of claim 1 wherein the light-diffusing surface is faceted.
8. The apparatus of claim 1 wherein the shapes of the opposing curved edges are one of semi-circular, parabolic, hyperbolic, semi-elliptical or skewed parabolic.
9. The apparatus of claim 1 wherein the at least one light source comprises one or more of a light bulb or a light-emitting diode (LED).
10. The apparatus of claim 1 wherein a free end of the flange is bent at an angle with respect to the rest of the flange.
11. The apparatus of claim 1 , further comprising a baffle positioned at or near a free end of the flange.
12. The apparatus of claim 11 wherein the baffle is transparent, translucent or opaque.
13. A system comprising:
a lighting apparatus comprising:
a curved light-diffusing surface including a pair of opposing curved edges and a pair of opposing longitudinal edges that extend between corresponding endpoints of the opposing curved edges, the light-diffusing surface having therein an imaging aperture,
a pair of specular reflective surfaces, each specular reflective surface being attached to a corresponding one of the curved edges,
at least one flange coupled to one of the pair of longitudinal edges and projecting toward the opposing longitudinal edge, and
at least one light source mounted on the at least one flange; and
a camera coupled to the lighting apparatus, the camera including imaging optics optically coupled to the imaging aperture.
14. The system of claim 13 wherein the light-diffusing surface has a light-diffusing coating thereon.
15. The system of claim 13 wherein the light-diffusing surface is smooth and continuous.
16. The system of claim 13 wherein the light-diffusing surface is faceted.
17. The system of claim 13 wherein the pair of specular reflective surfaces are planar and are parallel to each other.
18. The system of claim 13 wherein the pair of opposing longitudinal edges are co-planar.
19. The system of claim 13 wherein the shapes of the opposing curved edges are one of semi-circular, parabolic, hyperbolic, semi-elliptical or skewed parabolic.
20. The system of claim 13 wherein the at least one light source comprises one or more of a light bulb or a light-emitting diode (LED).
21. The system of claim 13 , further comprising a signal conditioning circuit coupled to the camera.
22. The system of claim 21 , further comprising an image processor coupled to the signal conditioning unit and to the camera.
23. The system of claim 22 , further comprising an input/output unit coupled to the processor.
24. A process comprising:
forming a curved light-diffusing surface including a pair of opposing curved edges and a pair of opposing longitudinal edges that extend between corresponding endpoints of the opposing curved edges;
attaching a pair of specular reflective surfaces to a corresponding one of the curved edges;
forming at least one flange on one of the pair of longitudinal edges, wherein the at least one flange projects toward the opposing longitudinal edge; and
mounting at least one light source on the at least one flange.
25. The process of claim 24 , further comprising depositing a light-diffusing coating on the light-diffusing surface.
26. The process of claim 24 wherein the pair of specular reflective surfaces are planar and are parallel to each other.
27. The process of claim 24 wherein the pair of opposing longitudinal edges are co-planar.
28. The process of claim 24 , further comprising forming an imaging aperture in the light-diffusing surface.
29. The process of claim 24 wherein the light-diffusing surface is smooth and continuous.
30. The process of claim 24 wherein the light-diffusing surface is faceted.
31. The process of claim 24 wherein the shapes of the opposing curved edges are one of semi-circular, parabolic, hyperbolic, semi-elliptical or skewed parabolic.
32. The process of claim 24 wherein the at least one light source comprises one or more of a light bulb or a light-emitting diode (LED).
33. The process of claim 24 , further comprising bending a free end of the flange an angle with respect to the rest of the flange.
34. The process of claim 24 , further comprising positioning a baffle at or near a free end of the flange.
35. The process of claim 34 wherein the baffle is transparent, translucent or opaque.