LED lamp module

• US 20090003009A1
• Filed: 01/30/2008
• Published: 01/01/2009
• Est. Priority Date: 06/30/2007
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Frey, Peter, Tessnow, Thomas, Madhani, Vipin, Tucker, Mike
• Granted Patent: US 7,686,486 B2
• Time in Patent Office: Days
• US Class Current: 362/487
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21S 41/143 the main emission direction of the LED being parallel to the optical axis of the illuminating device
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/28 Cover glass
• CPC Class Codes: F21S 41/29 Attachment thereof for achieving variable light distribution F21S41/63
• CPC Class Codes: F21S 41/321 the reflector being a surface of revolution or a planar surface, e.g. truncated
• CPC Class Codes: F21S 45/10 Protection of lighting devices cooling of lighting devices F21S45/40; waterproofing of lighting devices F21S45/50
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21S 45/48 with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21W 2102/00 Exterior vehicle lighting devices for illuminating purposes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp (10) has a housing (12) with an interior wall (14) defining a cavity (16). An LED light source (26) is positioned in the cavity (16) and project light in a forward direction. A reflector (28) having a reflective surface (30), a forward opening (32) and a rear opening (34) surrounds the light source (26) and a complex lens (38) closes the forward opening. The lens (38) comprises a first optical refractive element (40) arranged around a peripheral edge (42) and a second optical refractive element (44) centrally located on the lens (38); the first optical refractive element (40) including a plurality of flute lenses (40a) and the second optical refractive element (44) comprising a concavo-convex lens (44a).

Claims

1. An LED lamp comprising:

a housing with an interior wall defining a cavity providing an opening facing a forward direction, said cavity having a back wall, said housing including a heat sink extending on an exterior side of said back wall;

a circuit board mounted in said cavity adjacent said back wall in thermal communication therewith;

an LED light source mounted on said back wall and surrounded by said circuit board and projecting light in said forward direction and sideways directions up to 90 degrees from said forward direction;

a reflector including a paraboloidal reflective surface and having a forward opening and a rear opening therein, said reflector being positioned in said cavity, said LED light source positioned in said rear opening to face said reflective surface, said reflector directing intercepted light from said LED;

a lens coupling with said housing to enclose said circuit board, LED light source and reflector, said lens having a first optical refractive element arranged around a peripheral edge and having a second optical refractive element centrally located on said cover lens; and

a plug coupling formed on said exterior of said housing for said receipt of an electrical supply lead to couple electric power to said circuit board.

2. The LED lamp of claim 1 wherein said first refractive element includes a plurality of flute lenses.

3. The LED lamp of claim 1, wherein said second refractive element includes a concavo-convex lens.

4. The LED lamp of claim 1 wherein a protective cover spans said lens, said protective cover being fixed to said housing.

5. An LED fog lamp comprising:

a housing with an interior wall defining a cavity providing an opening facing a forward direction “

F”

, said cavity having a back wall, said housing including a heat sink extending on an exterior side of said back wall, said heat sink including at least one radially extending thin wall exposed to air;

a circuit board mounted in said cavity adjacent said back wall 18 in thermal communication therewith;

an LED light source supported on said back wall and surrounded by said circuit board and projecting light in said forward direction “

F” and

sideways directions “

SW”

;

a reflector having a reflective surface, and a forward opening and a rear opening, said reflector being positioned in said cavity and pressing said circuit board toward said back wall to enable good thermal conduction from said circuit board to said back wall, said LED light source being positioned in said reflector rear opening to face said reflective surface;

said reflector directing intercepted light from said LED light source in said forward direction;

a lens coupling with said housing to enclose said circuit board, LED light source and said reflector, said lens having a first optical refractive element arranged around a peripheral edge of said lens and having a second optical refractive element centrally located on said lens;

said first optical refractive element including a plurality of flute lenses and said second optical refractive element comprising a concavo-convex lens;

a protective cover spanning said housing and sealing said cavity; and

a plug coupling formed on said exterior of said housing for receipt of an electrical supply lead to couple electric power to said circuit board.

6. A lens for a fog light comprising a first optical refractive element arranged around a peripheral edge of said lens and a second optical refractive element 44 centrally located on said lens;

said first optical refractive element including a plurality of flute lenses and said second optical refractive element comprising a concavo-convex lens.