Incandescent lamp with a carbon cycle and a halogen cycle
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorsAxel Bunk, Matthias Damm, Georg Rosenbauer, Joachim Werner
Life of this patent
Estimating the term…
Abstract
The incandescent lamp, which uses a carbon cycle process, is equipped with a luminous body which, together with a fill, is introduced in a vacuum-tight manner into a bulb, the luminous body including a metal carbide, the melting point of which is above that of tungsten. The distance between the luminous body and the wall of the bulb is less than 18 mm, with a first cycle process, which is attributed to the carbon, being effected by the use of carbon and hydrogen as fill additive, and a second cycle process, which is attributed to the metal, being effected by the use of halogen.
Claims18
An incandescent lamp comprising:
- a light transmissive bulb having a wall defining an enclosed volume sealed in a vacuum-tight manner;
- a luminous body positioned in the enclosed volume;
- the luminous body including a metal carbide having a melting point greater than the melting point of tungsten, the least distance between the luminous body and the wall being less than 18 mm;
- electrical leads sealed through the wall and electrically coupled to the luminous body;
- a filing enclosed in the enclosed volume including:
- an inert fill gas;
- and
- one or more additives composed of carbon, hydrogen and halogens, so that the total content in the gas phase, based on a cold filling pressure of 1 bar, in mol percent is:
- carbon 0.1%-5.0%,
- hydrogen 0.2%-20.0%,
- halogen, not including fluorine 0.05%-0.5%;
- and no nitrogen;
- whereby a first cycle process is supported attributed to the carbon, and a second cycle process is supported which is attributed to the metal and halogen.
An incandescent lamp comprising:
- a light transmissive bulb having a wall defining an enclosed volume sealed in a vacuum-tight manner;
- a luminous body positioned in the enclosed volume;
- the luminous body including a metal carbide having a melting point greater than the melting point of tungsten, the least between the luminous body and the wall being less than 18 mm;
- electrical leads sealed through the wall and electrically coupled to the luminous body;
- a filing enclosed in the enclosed volume including:
- an inert fill gas;
- and further one or more additives composed of carbon, hydrogen and halogens, so that the total content in the gas phase, based on a cold filling pressure of 1 bar, in mol percent is:
- carbon 0.25%-5.0%,
- sulfur 0.05%-5.0%,
- hydrogen 0.5%-40.0%,
- halogen, not including fluorine of 0.02%-0.5% or iodine of 0.02%-40.0%,
- and no nitrogen;
- whereby a first cycle process is supported attributed to the carbon, and a second cycle process is supported which is attributed to the metal and halogen.
Dependencies are inferred from the claim text.