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 having at least first and second portions of a reflecting surface, said first portion having a first conic or conic-like shape, and said second portion having a second conic or conic-like shape that differs from the first conic or conic-like shape of said first pattern; and
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the reflector.
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 at least one of (1) radially along the reflector or (2) along a radial position of the reflector.
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 according to claim 1 , wherein each of said first and second portions of the reflecting surface of 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 1 , wherein each of said first and second portions of the reflecting surface of 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.
8. An illumination source according to claim 1 , wherein said first and second portions are different portions offset by 90° from each other.
9. An illumination source according to claim 1 , wherein said first and second portions are different portions offset radially from each other on the reflecting surface.
10. An illumination source according to claim 1 , wherein said first and second portions are different portions along a same radial positioning on the reflecting surface.
11. An illumination source according to claim 1 , wherein said first and second conic or conic-like portions are represented by a set of points and a basic curve or a spline fit, resulting in a conic-like shape of said first and second portions of the reflector.
12. An illumination source comprising:
means for reflecting a reflector having at least first and second portions of a reflecting surface, said first portion having a first conic or conic-like shape, and said second portion having a second conic or conic-like shape that differs from the first conic or conic-like shape of said first portion; and
a light-emitting diode LED positioned at approximately 90° with respect to a central axis of the means for reflecting.
13. An illumination source according to claim 12 , 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.
14. An illumination source according to claim 12 , wherein the conic or conic-like shape means for reflecting includes segmented or faceted surfaces at least one of (1) radially along the reflector or (2) along a radial position of the reflector.
15. An illumination source according to claim 12 , wherein the means for reflecting is formed of one of: a metal; a metalized surface; or a reflectorized surface.
16. An illumination source according to claim 12 , wherein the means for reflecting is formed of a solid material of plastic or glass that reflects light through total internal reflection.
17. An illumination source according to claim 12 , wherein each of said first and second portions of the reflecting surface of 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.
18. An illumination source according to claim 12 , wherein each of said first and second portions of the reflecting surface of 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.
19. An illumination source according to claim 12 , wherein said first and second portions are different portions offset by 90° from each other.
20. An illumination source according to claim 12 , wherein said first and second portions are different portions offset radially from each other on the reflecting surface.
21. An illumination source according to claim 12 , wherein said first and second portions are different portions along a same radial positioning on the reflecting surface.
22. An illumination source according to claim 12 , wherein said first and second conic or conic-like portions are represented by a set of points and a basic curve or a spline fit, resulting in a conic-like shape of said first and second portions of the reflector.