LED work light

• US 8,033,681 B2
• Filed: 06/29/2009
• Issued: 10/11/2011
• Est. Priority Date: 03/18/2004
• Status: Active Grant

• Current Assignee: Alltemp Products Company Limited (DiversiTech Holdings, Inc.)
• Original Assignee: Basscorp Limited
• Inventors: Hallgrimsson, Bjarki, Hilts, Lorne, Whitfield, Robert Tod, Dobbin, Sarah, Klipstein, Donald L., Brass, Jack
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US12/458,018
• Publication Number:
  US 20100008082A1
• Time in Patent Office: 834 Days
• Field of Search: 362/202, 362/184, 362/208, 362/237, 362/311.01, 362/311.02, 362/311.09, 362/311.1, 362/336, 362/340, 362/451, 359/708, 359/718, 359/719
• US Class Current: 362/202
• CPC Class Codes: F21L 14/023 having two or more, or different light sources
• CPC Class Codes: F21L 4/00 Electric lighting devices with self-contained electric batteries or cells
• CPC Class Codes: F21L 4/08 characterised by means for in situ recharging of the batteries or cells
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21V 15/04 Resilient mountings, e.g. shock absorbers shock absorbing devices of vehicle headlamp housings B60Q1/0491; in general F16F15/04
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 21/06 Bases for movable standing lamps; Fixing standards to the bases F21V21/08 takes precedence
• CPC Class Codes: F21V 21/08 Devices for easy attachment to any desired place, e.g. clip, clamp, magnet
• CPC Class Codes: F21V 21/32 Flexible tubes
• CPC Class Codes: F21V 21/406 for portable lighting devices
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/0435 activated by remote control means
• CPC Class Codes: F21V 27/005 for portable lighting devices
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2103/10 : comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 : Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 : Controlling the intensity of the light
• CPC Class Codes: H05B 45/375 : using buck topology
• CPC Class Codes: H05B 45/38 : using boost topology
• CPC Class Codes: H05B 45/56 : involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A light comprising an LED whose light intensity decreases as the angle from an axis of the LED increases, and a convex lens associated with the LED such that a beam width of the LED is concentrated by the lens into a narrower beam width, wherein the convex lens includes both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the beam width of the lens.

Claims

1. A light comprising:

a) an LED whose light intensity decreases as the angle from an axis of the LED increases, and

b) a convex lens associated with the LED such that a beam width of the LED is concentrated by the lens into a narrower beam width, wherein the convex lens includes both a convex surface and a concave surface, and the concave surface is curved more sharply in a concave manner towards its edge than towards its center such that light is entirely by refraction more evenly spread across the width of the beam exiting lens.

2. The work light of claim 1 further comprising:

a) a plurality of LEDs including the LED, and

b) a plurality of convex lenses including the convex lens,

wherein each LED produces a beam of light whose light intensity decreases as the angle from an axis of the LED increases,

wherein each lens is associated with a respective one of the LEDs such that a beam width of each LED is concentrated by its associated lens into a narrower beam width,

wherein the plurality of LEDs and lenses are arranged to produce a combined work light beam, and

wherein each lens has both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the area of the width of the beam exiting the lens than across a beam emitted by its associated LED.

3. The light of claim 1 further comprising a casing housing the LED and lens, wherein light emitting from the lens emits from the casing.

4. The light of claim 2 further comprising a casing housing the LEDs and lenses, wherein light emitting from the lenses emits from the casing.

5. The light of claim 4 further comprising a low voltage direct current power source to power the LEDs.

6. The light of claim 2 wherein the convex surface of each convex lens has a diameter, and the concave surface of each convex lens has a diameter smaller than that of the convex surface of its respective convex lens.

7. The light of claim 2 wherein the LEDs are white LEDs.

8. The light of claim 2 wherein each LED has a nominally lambertian radiation pattern.

9. The light of claim 8 wherein each lens achieves a beam width of no more than about 90 degrees.

10. The light of claim 9 wherein each lens achieves a beam width of at least about 90 degrees.

11. The light of claim 1, wherein the convex lens is a concavo-convex lens and the convex surface is a convex forward surface of the lens and the concave surface is a concave rear surface of the lens, and wherein the light further comprises an axis through the LED, the convex forward surface and the concave rear surface, and the rear surface is between the forward surface and the LED along the axis.

12. The work light of claim 11 further comprising:

a) a plurality of LEDs including the LED, and

b) a plurality of convex lenses including the convex lens,

wherein each LED produces a beam of light whose light intensity decreases as the angle from an axis of the LED increases,

wherein each lens is associated with a respective one of the LEDs such that a beam width of each LED is concentrated by its associated lens into a narrower beam width,

wherein the plurality of LEDs and lenses are arranged to produce a combined work light beam, and

wherein each lens has both a convex surface and a concave surface, and the concave surface is curved more sharply towards its edge than towards its center such that light is more evenly spread across the area of the width of the beam exiting the lens than across a beam emitted by its associated LED.

13. The light of claim 11 further comprising a casing housing the LED and lens, wherein light emitting from the lens emits from the casing.

14. The light of claim 12 further comprising a casing housing the LEDs and lenses, wherein light emitting from the lenses emits from the casing.

15. The light of claim 14 further comprising a low voltage direct current power source to power the LEDs.

16. The light of claim 12 wherein the convex surface of each convex lens has a diameter, and the concave surface of each convex lens has a diameter smaller than that of the convex surface of its respective convex lens.

17. The light of claim 12 wherein the LEDs are white LEDs.

18. The light of claim 12 wherein each LED has a nominally lambertian radiation pattern.

19. The light of claim 18 wherein each lens achieves a beam width of no more than about 90 degrees.

20. The light of claim 19 wherein each lens achieves a beam width of at least about 90 degrees.