LED illumination device with a semicircle-like illumination pattern
An LED (light emitting diode) illumination device that can generate a non-circular light output illumination intensity pattern. The illumination source including a reflector with a conic or conic-like shape. Further, an LED is positioned at approximately 90° with respect to a central axis of the reflector.
1. An illumination source comprising:
a reflector with a conic or conic-like shape;
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the reflector,
wherein the reflector satisfies:
z
=
cr
2
1
+
)
1
-
(
1
+
k
)
c
2
r
2
_
r
2
=
x
2
+
y
2
,
in which x, y, and z are positions on a 3-axis system, k is conic constant, and c is curvature.
2. An illumination source according to claim 1 , wherein the conic or conic-like shape reflector has a shape selected from the group consisting of: a hyperbola; a parabola; an ellipse; a sphere; or a modified conic.
3. An illumination source according to claim 1 , wherein the conic or conic-like shape reflector includes segmented or faceted surfaces.
4. An illumination source according to claim 1 , wherein the reflector is formed of one of: a metal; a metalized surface; or a reflectorized surface.
5. An illumination source according to claim 1 , wherein the reflector is formed of a solid material of plastic or glass that reflects light through total internal reflection.
6. An illumination source comprising:
means for reflecting light having a conic or conic-like shape;
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the means for reflecting,
wherein the reflector satisfies:
z
=
cr
2
1
+
1
-
(
1
+
k
)
c
2
r
2
,
r
2
=
x
2
+
y
2
in which x, y, and z are positions on a 3-axis system, k is conic constant, and c is curvature.
7. An illumination source according to claim 6 , wherein the conic or conic-like shape means for reflecting has a shape selected from the group consisting of: a hyperbola; a parabola; an ellipse; a sphere; or a modified conic.
8. An illumination source according to claim 6 , wherein the conic or conic-like shape means for reflecting includes segmented or faceted surfaces.
9. An illumination source according to claim 8 , wherein the means for reflecting is formed of one of: a metal; a metalized surface; or a reflectorized surface.
10. An illumination source according to claim 6 , wherein the means for reflecting is formed of a solid material of plastic or glass that reflects light through total internal reflection.
11. An illumination source comprising:
a reflector with a conic or conic-like shape;
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the reflector, wherein the reflector satisfies:
z
=
cr
2
1
+
)
1
-
(
1
+
k
)
c
2
r
2
_
+
F
r
2
=
x
2
+
y
2
,
in which x, y, and z are positions on a 3-axis system, k is conic constant, c is curvature, and F is an arbitrary function.
12. An illumination source according to claim 11 , wherein the conic or conic-like shape reflector has a shape selected from the group consisting of: a hyperbola; a parabola; an ellipse; a sphere; or a modified conic.
13. An illumination source according to claim 11 , wherein the conic or conic-like shape reflector includes segmented or faceted surfaces.
14. An illumination source according to claim 11 , wherein the reflector is formed of one of: a metal; a metalized surface; or a reflectorized surface.
15. An illumination source according to claim 11 , wherein the reflector is formed of a solid material of plastic or glass that reflects light through total internal reflection.
16. An illumination source comprising:
means for reflecting light having a conic or conic-like shape;
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the means for reflecting, wherein the reflector satisfies:
z
=
cr
2
1
+
)
1
-
(
1
+
k
)
c
2
r
2
_
+
F
r
2
=
x
2
+
y
2
,
in which x, y, and z are positions on a 3-axis system, k is conic constant, c is curvature, and F is an arbitrary function.
17. An illumination source according to claim 16 , wherein the conic or conic-like shape means for reflecting has a shape selected from the group consisting of: a hyperbola; a parabola; an ellipse; a sphere; or a modified conic.
18. An illumination source according to claim 16 , wherein the conic or conic-like shape means for reflecting includes segmented or faceted surfaces.
19. An illumination source according to claim 16 , wherein the means for reflecting is formed of one of: a metal; a metalized surface; or a reflectorized surface.
20. An illumination source according to claim 16 , wherein the means for reflecting is formed of a solid material of plastic or glass that reflects light through total internal reflection.