High-pressure electric discharge lamp with tight lead-through pi

Details High-pressure electric discharge lamp with tight lead-through pi High-pressure electric discharge lamp with tight lead-through pi

1993-05-27

1995-08-29

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

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

313284, 313624, 313625, 313253, H01J 1718, H01J 6136

Patent

active

054463416

ABSTRACT:
To provide a tight seal between an essentially solid niobium or tantalum necting pin or rod (10) passing through an opening (7, 28) in an end plug (11) closing off a high-pressure discharge lamp discharge vessel (8), the pin or rod is formed with two axial portions, one of which has externally projecting continuous rings (17), preferably two or three, or an externally projecting thread (26). The rings or thread are press-fitted into the end portion of the bore in the plug, which deforms the edge (20) of the rim, ridge or thread, or shears off the edge portion, ensuring a tight preliminary fit in the bore; sealing glass, which is then melted to fill a capillary space between the pin or rod and the plug, is protected by the preliminary seal against corrosion or attack from the fill within the discharge lamp; if the projection is in form of a thread, glass can penetrate within the threads to further seal and retain the pin or rod. Diffusion-welding of the threads or ridges to the walls of the plug can also be used.

REFERENCES:
patent: 3505555 (1970-04-01), Church
patent: 3956660 (1976-05-01), Ooms
patent: 4376905 (1983-03-01), Kerekes
patent: 4501799 (1985-02-01), Driessen et al.
patent: 4507584 (1985-03-01), Coaton et al.
patent: 4545799 (1985-10-01), Rhodes et al.
patent: 4560903 (1985-12-01), Sneijers et al.
patent: 4740403 (1988-04-01), Oomen et al.
patent: 4970425 (1990-11-01), Barakitis

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