Electricity introducing member for vessels

Details Electricity introducing member for vessels Electricity introducing member for vessels

1999-04-07

2001-11-20

Day, Michael H. (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

C313S332000

Reexamination Certificate

active

06320314

ABSTRACT:

TECHNICAL FIELD
The invention relates to an electrical inlet body for a tube lamp, such as a discharge lamp, a halogen lamp, or the like.
DESCRIPTION OF THE RELATED ART
In a discharge lamp in which there are a pair of electrodes opposite one another, recently functional gradient material has been increasingly used as a sealing arrangement. In a sealing body of this functional gradient material one side is rich in a dielectric component and in the direction to the other side the proportion of electrically conductive component increases continuously or incrementally. A one-part arrangement of this functional gradient material with upholding parts of the electrodes is called the “electrical inlet body”.
In a functional gradient material in which as the dielectric component silicon dioxide is used and as the electrically conductive component molybdenum is used, the silicon dioxide end has a coefficient of thermal expansion which is roughly equal to the coefficient of thermal expansion of the silicon dioxide which forms the arc tube, while the molybdenum end has the property that its coefficient of thermal expansion approaches the coefficient of thermal expansion of the tungsten or molybdenum which forms the upholding parts of the electrodes. These properties are suitable for a sealing body of a discharge lamp.
A functional gradient material as the sealing body can also be used not only for a discharge lamp, but also for a halogen lamp provided with a luminous filament or a halogen heating apparatus provided with a filament because the arc tube consists of silica glass.
The process for producing one such functional gradient material is disclosed for example in Japanese patent disclosure document HEI 8-138555.
DISCLOSURE OF THE INVENTION
As claimed in the invention an electrical inlet body described below for a tube lamp is given:
(1) The invention is characterized in an electrical inlet body for a tube lamp in that a functional gradient material of an electrically conductive component and silicon dioxide is used as the dielectric component, that several combined layers are placed on top of one another cylindrically and incrementally, the volumetric ratio (%) of silicon dioxide in this functional gradient material being designated n
1
, n
2
, n
3
, . . . , nx (n
1
>n
2
>n
3
> . . . nx), that furthermore L/D≧2, when the diameter of this cylindrical functional gradient material is labelled D (mm) and the total thickness of the combined layers with a volumetric ratio of silicon dioxide of greater than 80% is labellea L (mm), and that the upholding parts of the electrodes proceeding from the side of the n
1
layer are shrunk as far as the combined layers with a volumetric ratio of silicon dioxide of at least less than or equal to 80%.
(2) The invention is furthermore characterized in that for (1) d/D is in the range from 0.12 to 0.6 , when the diameter of the electrode carrier is labeled d (mm).


REFERENCES:
patent: 4881009 (1989-11-01), Passmore
patent: 5861714 (1999-01-01), Wei et al.
patent: 6107740 (2000-08-01), Morimoto et al.
patent: 6175188 (2001-01-01), Morimoto et al.
patent: 6194832 (2001-02-01), Juengst
patent: 0 650 184 (1995-04-01), None
patent: 1 043 754 (2000-11-01), None
patent: 10-175514 (1998-06-01), None
patent: 10-188897 (1998-07-01), None
patent: 10-289691 (1998-10-01), None
patent: 10-280009 (1998-10-01), None
Patent Abstracts of Japan, vol. 1998, No. 10, Aug. 31, 1998, JP 10 125284 A, Toto Ltd., May 15, 1998, English Abstract.

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