Patent ID: 7800290

Claim:
An incandescence emitter for incandescence light sources, comprising an emitter body (F) to be brought to incandescence at an operating temperature by means of passage of electric current, the emitter body (F) extending between two electrodes (H), wherein on at least one surface of the emitter body (F) a micro-structure (R) is provided, operative to enhance absorbance for wavelengths belonging to the visible region of the spectrum, wherein said micro-structure (R) is at least partly made of a first material (Au) whose melting temperature is lower than the operating temperature of the emitter body (F), said electrodes (H) are made of a second material having a high melting point, such as tungsten, at least a substantial portion of the emitter body (F), including said micro-structure (R), is coated with a coating layer (OR) made of an oxide with high melting point, such as a refractory oxide, said oxide being configured to preserve a profile of said microstructure (R) in case of melting of the first material (Au), consequent to the use of the emitter body (F) at an operating temperature exceeding the melting temperature of said first material (Au), and wherein at least one of said emitter body (F), said electrodes (H) and said coating layer (OR) includes one throat or cavity (G) being open on the first material (Au) for receiving part of said first material (Au) in case of melting thereof.