"Traditional incandescent light bulbs are inefficient and have life time issues. LED-based technology is moving to replace traditional bulbs and even
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the invention concern solid-state lamps with improved emission and thermal characteristics.
"In an embodiment of the invention a lamp, comprises at least one solid-state light emitting device; a thermally conductive body; at least one duct; and a photoluminescence wavelength conversion component remote to the at least one solid state light emitting device, wherein the at least one duct extends through the photoluminescence wavelength conversion component. The duct which can be formed as an integral part of the body or as a separate component is configured to define a pathway for thermal airflow through the thermally conductive body and thereby provide cooling of the body and the at least one light emitting device.
"The component in conjunction with the duct and a surface of the body define a volume that encloses the at least one light emitting device. The component can comprise a substantially toroidal shell or a cylindrical shell.
"In some embodiments the thermally conductive body further comprises a cavity which in conjunction with the duct define a pathway for thermal airflow through the thermally conductive body. The cavity can comprise a plurality of openings enabling thermal airflow through the duct and the body which can be positioned on a side surface of the body. One or more of the openings can comprise an elongated opening such as a rectangular slot. To aid in dissipating heat the lamp can further comprise circumferentially spaced heat radiating fins on the thermally conductive body. In such an arrangement one or more of the openings can be located between the heat radiating fins.
"To maximize light emission from the lamp the lamp can further comprise a light reflective surface disposed between the duct and component. In some embodiments the light reflective surface comprises at least a part of an outer surface of the duct. The light reflective surface can be formed with a light reflective sleeve that is positioned adjacent to the duct. Alternatively the surface of the duct can be treated to make it light reflective. In some embodiments the light reflective surface comprises a substantially conical surface.
"To ensure a uniform radial emission pattern the lamp can further comprise a light diffusive component. In some embodiments the light diffusive component comprises a substantially toroidal shell through which the duct passes.
"In accordance with an embodiment of the invention a photoluminescence component comprises: a light transmissive wall defining an exterior surface, said component having at least two opening and at least one photoluminescence material which generates light in response to excitation light, wherein in operation the component emits light over angles of at least +135.degree. with a variation in emitted luminous intensity of less than about 20%. Preferably the component is further configured in operation to emit at least 5% of the total luminous flux over angles of +135.degree. to of +180.degree.. In some embodiments the component comprises a substantially toroidal shell. For ease of fabrication the toroidal shell preferably comprises two parts that are identical. In other arrangements the component comprises a cylindrical shell.
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