Light emitting diode package assembly that emulates the light pattern produced by an incandescent filament bulb
First Claim
1. A light emitting diode package assembly for emulating the pattern of light produced by an incandescent filament bulb comprising:
- a first subassembly and a second subassembly, each subassembly comprising a substrate having a front surface and a back surface, the substrates being disposed in back-to-back adjacency with a thermally conductive adhesive disposed between the back surfaces to form a heat sinking base having the respective front surfaces opposing each other, each of the front surfaces having an overlying dielectric layer disposed thereon, and each of the overlying dielectric layers having a reflective surface layer formed thereon;
a plurality of LEDs disposed directly on each of the reflective surface layers;
wherein edges of each reflective surface layer extend beyond edges of the LEDs disposed thereon; and
a transverse reflecting element disposed on each overlying dielectric layer and configured to reflect a portion of the light emitted by each of the plurality of LEDs, wherein each transverse reflecting element is a cone, a truncated cone, or a barrel formed of two truncated cones.
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Accused Products
Abstract
In accordance with the invention, a light emitting diode package assembly is provided to emulate the pattern of light produced by an incandescent filament bulb. The package assembly is composed of a substrate for LEDs comprising a heat-sinking base having a pair of opposing major surfaces. Each major surface has an overlying of thermally conducting ceramic and an outer surface layer of light reflective material. Disposed on each surface layer is a plurality of LEDs. Advantageously, the LEDs are arranged on the surface in a configuration of low mutual obstruction. Advantageously, reflecting elements transverse to each surface layer are positioned and shaped to reflect a substantial portion of the light emitted from the LEDs that would otherwise enter neighboring LEDs. In a preferred embodiment, the LEDs are arranged in the general form of a closed curve, and a transverse reflector is disposed in the interior of the curve. Alternatively, the LEDs can be arranged in a linear array. The assembly can be efficiently fabricated by back-to-back assembly of two similar subassemblies.
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Citations
25 Claims
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1. A light emitting diode package assembly for emulating the pattern of light produced by an incandescent filament bulb comprising:
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a first subassembly and a second subassembly, each subassembly comprising a substrate having a front surface and a back surface, the substrates being disposed in back-to-back adjacency with a thermally conductive adhesive disposed between the back surfaces to form a heat sinking base having the respective front surfaces opposing each other, each of the front surfaces having an overlying dielectric layer disposed thereon, and each of the overlying dielectric layers having a reflective surface layer formed thereon; a plurality of LEDs disposed directly on each of the reflective surface layers; wherein edges of each reflective surface layer extend beyond edges of the LEDs disposed thereon; and a transverse reflecting element disposed on each overlying dielectric layer and configured to reflect a portion of the light emitted by each of the plurality of LEDs, wherein each transverse reflecting element is a cone, a truncated cone, or a barrel formed of two truncated cones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A light emitting diode (LED) package assembly comprising:
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a first subassembly and a second subassembly, each subassembly comprising a substrate having a front surface and a back surface, the substrates being disposed in back-to-back adjacency and adhered to each other with a thermally conductive adhesive disposed between the back surfaces to form a heat sinking base having the respective front surfaces opposing each other, wherein each of the opposing front surfaces has disposed thereon an overlying dielectric layer comprising a non-crystallizing glass or a glass ceramic having a thermal coefficient of expansion matched to the thermal coefficient of expansion of the heat sinking base, and each overlying dielectric layer having a reflective surface layer formed thereon; a plurality of LEDs disposed directly on each of the reflective surface layers wherein edges of each reflective surface layer extend beyond edges of the LEDs disposed thereon; a transverse reflecting element disposed on each overlying dielectric layer and configured to reflect a portion of the light emitted by each of the plurality of LEDs, wherein each transverse reflecting element is a cone, a truncated cone, or a barrel formed of two truncated cones. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A light emitting diode package assembly for emulating the pattern of light produced by an incandescent filament bulb, comprising:
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a first subassembly and a second subassembly, each subassembly comprising a substrate having a front surface and a back surface, each front surface having an overlying dielectric layer disposed thereon, each overlying dielectric layer having a reflective surface layer formed thereon, and each reflective surface layer having more than one LED disposed directly thereon; wherein the first subassembly and the second subassembly are disposed in back-to-back adjacency with a thermally conductive adhesive disposed between the back surfaces to form a heat sinking base having the respective front surfaces facing away from each other; and a transverse reflecting element disposed on each overlying dielectric layer and configured to reflect a portion of the light emitted by each of the plurality of LEDs, wherein each transverse reflecting element is a cone, a truncated cone, or a barrel formed of two truncated cones. - View Dependent Claims (25)
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Specification