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US 7,322,871 B2Granted
Process to make nano-structured emitters for incandescence light sources
AssigneeC.R.F. Societa Consortile per Azioni
InventorsVito Lambertini, Daniele Pullini, Nello Li Pira, Mauro Brignone, Piermario Repetto, Marzia Paderi, Rossella Monferino
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Abstract
In a process to make an emitter (10) for light sources, which can be led to incandescence through the passage of electric current, a layer made of anodized porous alumina (1) is used as sacrificial element for the structuring of at least a part of the emitter (10).
Claims22
A method of making an electrically conductive incandescence emitter for incandescence light sources, comprising:
- providing a layer of tungsten or a tungsten alloy;
- using as a sacrificial element for the structuring of at least a part of the layer of tungsten or tungsten alloy a layer made of anodized porous alumina;
- wherein said emitter can be led to incandescence through the passage of electric current through the layer of tungsten or tungsten alloy.
Dependencies are inferred from the claim text.