Eye-imaging system and apparatus with coordinated illuminator fibers having a skewed fiber angle
View Patent ↗A prism array light redistribution apparatus for an eye imaging system including light transmitting fibers, light receiving fibers, and a micro prism array optically coupled to bridge the light transmitting fibers and the light receiving fibers, configured to receive light having a bell-shaped angular distribution from the light transmitting fibers and refract light emitted by the light transmitting fibers to enter the light receiving fibers.
1. An eye-imaging apparatus comprising:
a light source;
one or more optical lenses defining an imaging path comprising an optical axis; and
illuminator fibers comprising fiber array ends that define light output pointing lines being a central line of its light emitting cone;
wherein the illuminator fibers are arranged such that the light output pointing lines are not on a meridional plane containing the optical axis and are at a skewed angle relative to the optical axis.
2. The apparatus of claim 1 wherein the illuminator fibers are arranged such that the light output pointing lines are at a skewed angle relative to each other.
3. The apparatus of claim 1 wherein the illuminator fibers have a numerical aperture of at least 0.60.
4. The apparatus of claim 1 wherein the illuminator fibers are positioned such that the maximum angle between the light output pointing line and the optical axis is at least 30 degrees.
5. The apparatus of claim 1 wherein the illuminator fibers are positioned such that the maximum angle between the light output pointing line and the optical axis is at least 35 degrees.
6. The apparatus of claim 1 wherein the illuminator fibers are positioned such that the maximum angle between the light output pointing line and the optical axis is at least 40 degrees.
7. The apparatus of claim 1 wherein the illuminator fibers have an illumination variation of less than or equal to 25 percent.
8. The apparatus of claim 1 wherein the illuminator fibers further comprise a prism array-based light profile redistribution element along an illumination light path from the light source to the fiber ends.
9. The apparatus of claim 1 wherein the illuminator fiber ends are arranged in a circular array.
10. The apparatus of claim 1 wherein the optical lenses comprises a conic lens having front diameter within a range from 3.0 mm to 4.0 mm and a half cone angle within a range from 25 degrees to 35 degrees.
11. The apparatus of claim 10 wherein the conic lens has a front diameter of 3.5 mm and a half cone angle of 30 degrees; and wherein the illuminator fibers are positioned such that the maximum angle between the light output pointing lines and the optical axis is 40 degrees.
12. The apparatus of claim 1 wherein the optical lenses comprise:
a doublet;
a singlet positioned optically proximal of the doublet;
a conic lens positioned optically proximal of the singlet; and
a contact lens positioned optically proximal of and in contact with the conic lens.
13. The apparatus of claim 1 wherein the illuminator fibers are multimodal.
14. The apparatus of claim 1 further comprising optically absorptive material positioned on sides of the illuminator fibers proximate to the fiber array ends.