LED lamps including LED work lights

• US 20080212319A1
• Filed: 12/21/2007
• Published: 09/04/2008
• Est. Priority Date: 12/24/2006
• Status: Active Grant

• Current Assignee: Alltemp Products Company Limited (DiversiTech Holdings, Inc.)
• Original Assignee: Brasscorp Limited
• Inventors: Klipstein, Donald L.
• Granted Patent: US 8,066,402 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: B60Q 3/35 Portable lighting devices
• CPC Class Codes: F21L 14/023 having two or more, or different light sources
• CPC Class Codes: F21L 4/06 with the light source coupled to the remainder of the device solely by cable
• CPC Class Codes: F21L 4/08 characterised by means for in situ recharging of the batteries or cells
• 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 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Work light has LEDs that may require heatsink. Desired radiation pattern achieved by using optical components designed to produce beam or LEDs may have beams in different directions. Radiation pattern of LEDs may be changed by refractive-reflective optics or by convex lenses. Convex lenses may be hemispheres, other planoconvex shapes, concavo-convex shapes, or other shapes. Curved surfaces on any lenses may be spherical or aspheric. Ballast to operate the LEDs from line voltage AC or low voltage DC. Work light may contain batteries. The work light may be mounted on a stand. May have accessory mount. May have charging station. May have a paging transmitter to activate a paging receiver in work light. May have openings for heat transfer from heatsink to ambient air external to light.

Claims

1. An LED work light, comprising:

a handle section and a head section, and a plurality of LEDs mounted in the head section, and means for the plurality of LEDs to receive electrical power, wherein;

each LED within the plurality of LEDs is associated with a lens that is located forward of its associated LED,

the lens associated with each LED in the plurality of LEDs forms a beam by projecting an image of the forward region of its associated LED,

and wherein all of the said lenses associated with LEDs in the plurality of LEDs form beams that merge together to form a useful combined beam substantially between 40 and 90 degrees.

2. The LED work light of claim 1, wherein the lenses have focal length not greater than 1.4 times the width of the forward regions of their associated LEDs.

3. The LED work light of claim 2, wherein the lenses have thickness at least half their diameters.

4. The LED work light of claim 2, wherein each lens has thickness greater than the distance between each lens and its associated LED.

5. The LED work light of claim 4, wherein each lens has thickness at least twice the distance between each lens and its associated LED.

6. The LED work light of claim 2, wherein each lens has a thickness equal to or greater than half the diameter of each lens.

7. The LED work light of claim 1, wherein the lenses are used to produce a beam having a higher percentage of the total light output being within the beam than would be the case if the lenses are omitted.

8. The LED work light of claim 7, wherein the lenses project a beam of light that is not narrower than that produced by the LEDs.

21. The LED work light of claim 1, wherein the LEDs are diffused LEDs.

22. The LED work light of claim 21, wherein the diffused LEDs have flat forward surfaces.

23. The LED work light of claim 22, wherein the LEDs include at least one white LED, at least one red LED, and at least one green LED.

9. An LED lamp, comprising:

a plurality of LEDs to provide light that is useful for illumination purposes, wherein the plurality of LEDs that produces light useful for includes;

one or more red LEDs,

one or more green LEDs,

one or more white LEDs,

and wherein the plurality of LEDs produces light that is mixed to produce a combined light output that has color approximating that of a blackbody radiator and having a correlated color temperature of 3,800 to 5,400 Kelvin.

10. The LED lamp light of claim 9, wherein the LED lamp is an LED work light having a head section and a handle section.

11. The LED lamp of claim 9, wherein the photometric output from the one or more green LEDs exceeds the photometric output of the one or more red LEDs.

12. The LED lamp of claim 9, with the ratio of the photometric output from the one or more green LEDs to the photometric output from the one or more red LEDs exceeding 1.5.

13. The LED lamp of claim 12, with the photometric output from the one or more green LEDs being essentially approximating 1.8 times that from the red LEDs.

14. The LED lamp of claim 12, with the photometric content from the one or more green LEDs being at least twice that of the red LEDs.

15. The LED lamp of claim 14, with the photometric content from the one or more green LEDs being at least 3 times that from the one or more red LEDs.

16. The LED lamp of claim 11 where the red LEDs contribute 3.5 to 18.5 percent of the total photometric output.

17. The LED lamp light of claim 11, wherein the white LEDs contribute at least half of the photometric output.

18. The LED lamp of claim 17, wherein the LED lamp is a work light having a head section and a handle section.

25. The LED work light of claim 9, further having a lens forward of each LED to form the light from the LEDs into a beam that is 40 to 90 degrees wide.

19. An LED work light, comprising:

a handle section and a head section, and a plurality of LEDs mounted in the head section, and means for the plurality of LEDs to receive electrical power, wherein;

each LED within the plurality of LEDs is associated with a lens that is located forward of its associated LED,

a diffuser is located forward of each LED and close to each LED, so that each LED produces an illuminated spot on the diffuser,

the lens associated with each LED in the plurality of LEDs forms a beam by projecting an image of the illuminated spot on the diffuser,

and wherein all of the said lenses associated with LEDs in the plurality of LEDs form beams that merge together to form a useful combined beam.

20. The LED work light of claim 19, wherein the LEDs include at least one white LED, at least one red LED, and at least one green LED.

24. An LED work light comprising:

a handle section and a head section, and a plurality of LEDs mounted in the head section, and means for the plurality of LEDs to receive electrical power, wherein;

each LED within the plurality of LEDs is associated with a lens that is located forward of its associated LED,

wherein each LED has chips located substantially rearward of the forward surface of each LED,

wherein each lens forms a beam of width 40 to 90 degrees wide, and

wherein the beams merge together into a single beam that is 40 to 90 degrees wide.

26. The LED work light of claim 26, wherein the LEDs have chips located substantially rearward of the edges of the front surfaces of the LEDs.