Illuminating optical lens for light emitting diode (LED)

• US 20110075418A1
• Filed: 09/24/2010
• Published: 03/31/2011
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: CoreLED Systems, LLC
• Original Assignee: CoreLED Systems, LLC
• Inventors: Mallory, Derek S., Wells, Brian C.
• Granted Patent: US 8,573,815 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21S 8/088 with lighting device mounted on top of the standard, e.g. for pedestrian zones
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 5/08 producing an asymmetric light distribution
• CPC Class Codes: F21W 2111/023 for pedestrian walkways
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0071 adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
• CPC Class Codes: G02B 19/0095 for use with ultraviolet radiation
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An illuminating optical lens article of manufacture for use with a light emitting diode (LED) mounted on a circuit board is provided. The lens has (a) a base portion defining a rim on a plane having a bottom surface around a longitudinal axis for mounting over the LED; (b) an integral refractory outer surface of the lens extending towards the longitudinal axis from the base; (c) an integral refractory inner surface of the lens extending from the base forming a cavity shaped and sized to receive an LED; and optionally (d) a plurality of grooved sections for receiving an adhesive formed on the bottom surface of the base portion. The base is adapted to be mounted on the circuit board onto which the LED is mounted. The integral refractory outer and inner surfaces each define a predetermined geometry adapted to direct and focus light emitting from the LED to a predetermined path. The lens is fabricated with a tolerance range of within 0.15 mm or better. The lens can be incorporated into a luminaire system and mounted on to a circuit board using adhesive polymers. The assembly of the lens into the luminaire system can be automated using robotics.

Claims

1. An illuminating optical lens article of manufacture for use with a light emitting diode (LED) mounted on a circuit board which comprises:

(a) a base portion defining a rim on a plane having a bottom surface around a longitudinal axis A-A for mounting over the LED;

(b) an integral refractory outer surface of the lens extending around and angled towards the longitudinal axis A-A from the base;

(c) an integral refractory inner surface of the lens extending from the base forming a cavity shaped and sized to receive an LED; and

(d) optionally, a plurality of grooved sections for receiving an adhesive formed on the bottom surface of the base portion;

wherein the base is adapted to be mounted on the circuit board onto which the LED is mounted;

wherein the integral refractory outer and inner surfaces each define a predetermined geometry adapted to direct and focus light emitting from the LED to a predetermined path; and

wherein the lens is fabricated with a tolerance range of the inner surface within 0.15 mm of the LED.

2. The lens of claim 1 wherein the base, the outer surface, and the inner surface of the lens are formed from as an integral unit fabricated from a polymer.

3. The lens of claim 1 wherein the lens is fabricated from an optically clear acrylic polymer.

4. The lens of claim 1 wherein the lens is fabricated from a polymer that is ultraviolet stabilized.

5. The lens of claim 1 wherein the lens is fabricated from a polymer having a refractive index ranging from about 1.4 to about 1.6.

6. The lens of claim 1 wherein the base defines a diameter between about 10 mm and 20 mm.

7. The lens of claim 1 wherein the base defines an opening for the cavity around and angled towards the longitudinal axis A-A and having a diameter between about 5.0 mm and 5.5 mm.

8. The lens of claim 1 wherein the lens comprises the plurality of grooved sections on the bottom surface of the base portion.

9. The lens of claim 8 wherein the grooved sections are spaced apart by a plurality of flats for molded ejector pins.

10. The lens of claim 8 wherein the grooved sections are adapted to receive a curable polymeric adhesive to be coated and light cured onto the circuit board.

11. The lens of claim 8 wherein the bottom surface of the base defines three equidistant grooved sections spaced apart circumferentially with three flats for ejector pins positioned there between.

12. The lens of claim 1 wherein the outer surface of the lens extends away from the base plane a distance between about 7 mm and 11 mm.

13. The lens of claim 1 wherein the predetermined path is selected whereby when the lens is mounted in a street lamp with a plurality of other lenses, the path emits the light onto a street with minimal light emission away from the street towards undesired locations.

14. The lens of claim 1 wherein the outer surface defines a conical cross-sectional geometry adapted to allow for total internal reflection (TIR), having a first and second section wherein the first section extends upward with respect to the plane of the base and radially inward to a peak and the second section forms a valley extending downward and inward towards the plane of the base.

15. The lens of claim 1 wherein the outer surface defines a cylindrical geometry adapted to allow for total internal reflection (TIR), having a first section extending upward and inward from the plane of the base and a second section defining a plane substantially flat and parallel with the plane of the base defining a center cavity forming a third section with an upward curve that that peaks below the plane of the second section.

16. The lens of claim 1 wherein the outer surface forms a first and a second curved section extending away from the plane of the base adapted to produce an illuminating flood light pattern.

17. The lens of claim 16 wherein the first curved section extends a distance away from the plane of the base greater than the second curved section.

18. The lens of claim 1 wherein the lens is adapted to be mounted into a luminaire system of a plurality of LEDs wherein each LED is positioned into the cavity of a separate individual lens of a plurality of lenses.

19. The lens of claim 18 wherein the luminaire system is a plurality of LED'"'"'s on a circuit board for a street lamp.

20. The lens of claim 18 wherein the plurality of lenses is between 20 and 100 lenses per luminaire system.

21. A method for assembling an illuminating optical lens system for use with a light emitting diode (LED) comprising the steps of:

(a) providing an LED mounted on a circuit board;

(b) providing a lens comprising (i) a base defining a circumferential rim on a plane having a bottom surface around a longitudinal axis A-A adapted to mount to the circuit board;

(ii) an integral refractory outer surface of the lens extending around and angled towards the longitudinal axis A-A from the base;

(iii) an integral refractory inner surface of the lens extending from the base forming a cavity shaped and sized to receive the LED; and

(iv) a plurality of grooved sections formed on the bottom surface of the base portion;

(c) applying adhesive to at least one of the lens or the circuit board around the LED for mounting the lens to the circuit board;

(d) mounting the lens to the circuit board over the LED wherein the LED is positioned within the cavity formed by the inner surface of the lens;

wherein the integral refractory outer and inner surfaces each define a predetermined geometry adapted to direct and focus light emitting from the LED to a predetermined path; and

wherein the lens is fabricated with a tolerance range of the inner surface within 0.15 mm of the LED.

22. The method of claim 21 wherein the adhesive is light curable adhesive polymer.

23. The method of claim 22 further comprising the step of emitting light on the adhesive polymer to cure the adhesive polymer.

24. The method of claim 23 wherein the emitting light is ultraviolet light.

25. The method of claim 22 wherein the adhesive polymer is evenly distributed on at least one of the lens or the printed circuit board in four drops circumferentially positioned around the LED.

26. The method of claim 25 wherein the mounting of the lens on the circuit board causes the polymeric adhesive to distribute into the grooves of the bottom surface of the base of the lens.

27. The method of claim 21 comprising performing steps (a)-(d) automatically through a preprogrammed robotic fabrication system.

28. The method of claim 21 further comprising the step of mounting the LED and lens in a luminaire system.

29. The method of claim 28 wherein the luminaire system is plurality of LED'"'"'s on a circuit board for a street lamp.

30. The method of claim 28 wherein the luminaire system comprises a plurality of LEDs each positioned in a separate lens.

31. The method of claim 28 wherein the plurality of lenses is between 20 and 100 lenses per luminaire system.

32. A luminaire system comprising:

(a) a plurality of light emitting diode (LED) units mounted on a circuit board;

(b) a plurality of illuminating optical lenses each mounted over and around an LED wherein each lens comprises (i) a base defining a circumferential rim on a plane having a bottom surface around a longitudinal axis A-A;

(ii) an integral refractory outer surface of the lens extending around and angled towards the longitudinal axis A-A from the base;

(iii) an integral refractory inner surface of the lens extending from the base forming a cavity shaped and sized to receive the LED;

wherein the base is adapted to be mounted on the circuit board, and (iv) optionally a plurality of grooved sections for receiving an adhesive formed on the bottom surface of the base portion, wherein the integral refractory outer and inner surfaces each define a predetermined geometry adapted to direct and focus light emitting from the LEDs to a predetermined path; and

wherein the lens is fabricated with a tolerance range of the inner surface within 0.15 mm of the LED.

33. The system of claim 32 wherein the lenses achieve efficiencies up to 85% for asymmetric light patterns.

34. The system of claim 32 wherein the lenses achieve efficiencies up to about 92% for symmetric light patterns.

35. The system of claim 32 wherein the luminaire system is a street lamp.

36. The system of claim 32 wherein the plurality of lenses is between 20 and 100 lenses per luminaire system.

37. The system of claim 32 wherein the predetermined path is symmetric.

38. The system of claim 32 wherein the predetermined path is asymmetric.