light emitting diode lamp with light pipes
View Patent ↗An LED light source has a housing having a base. A core projects from the base; is substantially cylindrical and is surrounded by tubes. The core and the base are arrayed about a longitudinal axis. A circuit board in the base supports LEDs. Each of the LEDs is positioned with one of the tubes in a one-to-one relationship at one end of the core. A heat sink is positioned in a heat-transferring relationship with the circuit board and a first reflector is attached to another end of the core. To direct the light emitted by the LEDs from the source to the reflector, the interior of the tubes can be plated with a highly reflective material. In one embodiment, each of the tubes is fitted with a light guide, each light guide extending from a position immediately above one of the LEDs to a position adjacent the reflector.
1. An LED light source comprising:
a housing having a base;
a hollow core projecting from said base, said hollow core being substantially cylindrical and being surrounded by a plurality of elongated hollow tubes, said hollow core and said base being arrayed about a longitudinal axis;
a printed circuit board positioned in said base and having a plurality of LEDs operatively fixed thereto, each of said plurality of LEDs being positioned with one of said elongated hollow tubes in a one-to-one relationship at one end of said hollow core;
a heat sink positioned in a heat-transferring relationship with said printed circuit board; and
a first reflector attached to another end of said hollow core.
2. The LED light source of claim 1 wherein each of said hollow tubes is fitted with a light guide, each light guide extending from a position immediately above one of said plurality of LEDs to a position adjacent said reflector.
3. The LED light source of claim 2 wherein each of said hollow tubes is provided with inner protrusions at each end for engaging said light guides, whereby said light guides have an air gap between their outer surface and the inner surface of said hollow tubes.
4. The LED light source of claim 3 wherein a heat sink is attached to said base and in thermal contact with said printed circuit board, said heat sink having a bottom with an upstanding side wall terminating in a plurality of fingers, said fingers being formed to overlie an upper surface of said base.
5. The LED light source of claim 4 wherein a second reflector is positioned at said one end of said hollow core, said second reflector having a curved surface directed at said first reflector.
6. The LED light source of claim 5 wherein said curved surface is parabolic.
7. An LED light source comprising:
a housing having a base;
a hollow core projecting from said base, said hollow core being substantially cylindrical and containing a plurality of light guides spaced about a longitudinal axis, each of said light guides having a straight portion and a curved portion, said curved portion extending away from said longitudinal axis;
a printed circuit board positioned in said base and having a plurality of LEDs operatively fixed thereto, each of said plurality of LEDs being positioned with one of said light guides in a one-to-one relationship at one end of said hollow core;
a heat sink positioned in a heat-transferring relationship with said printed circuit board; and
a reflector attached to said one end of said hollow core, light emanating from said curved portions of said light guides being directed toward said reflector.
8. The LED light source of claim 7 wherein said reflector has a parabolic curvature.
9. An LED light source comprising:
a housing having a base;
a hollow core projecting from said base, said hollow core being substantially cylindrical and being surrounded by a plurality of elongated hollow tubes, said hollow core and said base being arrayed about a longitudinal axis;
a printed circuit board positioned in said base and having a plurality of LEDs operatively fixed thereto, each of said plurality of LEDs being positioned with one of said elongated hollow tubes in a one-to-one relationship at one end of said hollow core; and
a heat sink positioned in a heat-transferring relationship with said printed circuit board.