Electric lamp and discharge devices – Incandescent lamps
Patent
1997-08-27
2000-01-25
Day, Michael H.
Electric lamp and discharge devices
Incandescent lamps
313578, 419 4, H01K 104
Patent
active
060182164
ABSTRACT:
The invention, an incandescent light source, radiates a significantly larger portion of its power within the visible spectrum by enclosing an electrically heated tungsten filament, the radiant primary, within a cavity bounded by a two-layer refractory oxide composite, the radiant secondary. The scattering and absorption coefficients of both layers are manipulated such that the inner layer is substantially absorbing in both the visible and the IR, while the outer layer, though optically thick across the spectrum, is substantially absorbing (and therefore substantially emissive) in the visible while being highly reflective in the IR High temperature cavity radiation established by the radiant primary is absorbed by the inner layer of the secondary, thereby heating both layers such that they radiate brilliantly. The outward emissions of the inner layer are absorbed or reflected back by the outer layer, while the emissions of the outer layer are externally radiated at substantially higher luminous efficiency than that of a tungsten filament.
REFERENCES:
patent: 1749136 (1930-03-01), Heany
patent: 3973155 (1976-08-01), Warren
patent: 4539505 (1985-09-01), Riseberg
D.L. Chubb, R.A. Lowe, "Thin-Film Selective Emitter" in J. of Appl. Phys. 74(9), pp. 5687-5698, Nov. 1, 1993.
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