LED ILLUMINATION DEVICE WITH A SEMICIRCLE-LIKE ILLUMINATION PATTERN

• US 20070133213A1
• Filed: 01/08/2007
• Published: 06/14/2007
• Est. Priority Date: 03/03/2005
• Status: Active Grant

• Current Assignee: Dialight Corporation (Dialight PLC)
• Original Assignee: Dialight Corporation (Dialight PLC)
• Inventors: Peck, John
• Granted Patent: US 7,604,384 B2
• Time in Patent Office: Days
• US Class Current: 362/341
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

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.

Claims

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:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)<br><br>c^2<br><br>r^2}}$ $r^2=x^2+y^2,$

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:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)<br><br>c^2<br><br>r^2}}+F$ $r^2=x^2+y^2,$

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:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)<br><br>c^2<br><br>r^2}}$ $r^2=x^2+y^2,$

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:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)<br><br>c^2<br><br>r^2}}+F$ $r^2=x^2+y^2,$

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.