Ceramic feedthroughs for discharge lamps

Details Ceramic feedthroughs for discharge lamps Ceramic feedthroughs for discharge lamps

1999-03-02

2001-05-15

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

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

C313S574000, C313S607000

Reexamination Certificate

active

06232718

ABSTRACT:

TECHNICAL FIELD
The invention relates to arc discharge lamps and more particularly to such lamps having electrically conducting ceramic feedthroughs serving as electrodes.
BACKGROUND ART
Arc discharge lamps, such as high and low pressure sodium, mercury and metal halide types, have a glass or ceramic hollow body containing therewithin an arc discharge generating and sustaining medium. Such mediums usually contain one or more metallic elements and one or more gases, as is well known in the art. Electrical current is supplied to the lamp via metal electrodes hermetically sealed in the lamp body. While this approach has worked for many years problems arise when the components of the lamp fill, or the operating temperature of the lamps, degrade the metal feedthroughs and shorten the expected lamp life. Additional problems can arise because the never quite perfect match of thermal expansion coefficients between the lamp body and the metal feedthroughs will eventually cause the lamp body or envelope to rupture.
DISCLOSURE OF INVENTION
It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
It is another object of the invention to enhance the sealing capabilities of discharge lamps.
Yet another object of the invention is the provision of ceramic feedthroughs for arc discharge lamps.
These objects are accomplished, in one aspect of the invention, by an arc discharge lamp body made from a material selected from glass and ceramic materials and defining a discharge space; an arc generating and sustaining medium contained within the discharge space; and an electrically conducting member in at least one end of the body and extending both interiorly and exteriorly thereof, the electrically conducting member being formed of an electrically conductive ceramic material having a thermal coefficient of expansion substantially matching that of the lamp body.


REFERENCES:
patent: 5424608 (1995-06-01), Juengst et al.
patent: 64-63255 (1989-03-01), None

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