High-pressure discharge lamp with ceramic discharge vessel and c

Details High-pressure discharge lamp with ceramic discharge vessel and c High-pressure discharge lamp with ceramic discharge vessel and c

1993-12-06

1995-10-03

Gross, Anita Pellman

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

Electrode supported by envelope

313289, 313573, 313623, 313625, 313634, 313636, 313638, H01J 196, H01J 1950, H01J 1718, H01J 6136

Patent

active

054554802

ABSTRACT:
To provide a sealed through arrangement for electrical leads through a ceramic end plug, suitable for discharge lamps of between about 50 to 250 W power rating, the lead-through (9) is made of a material having a thermal coefficient of expansion which is substantially less than that of a ceramic sealing plug (10), for example of tungsten, molybdenum or rhenium, but so small that the individual, actual expansion of the ceramic material will not cause separation from the metal, and/or a glass melt, ceramic melt or sintar connection therewith. The electrical connection is formed by at least two, and preferably more than two, thin wires or pins (23) having a diameter, each, of up to only about 0.25 mm, and preferably less. Each of the wires, then, will carry currents in the tenths ampere ranges, sufficient for operation of the lamp, and passed through melt-sealed capillary openings in the ceramic sealing plug (10).

REFERENCES:
patent: 2241505 (1941-05-01), Cuttler
patent: 3848151 (1974-11-01), McVey
patent: 4011480 (1977-03-01), Jacobs et al.
patent: 4376905 (1983-03-01), Kerekes
patent: 4717852 (1988-01-01), Dobrusskin et al.
patent: 4837477 (1989-06-01), Dassler et al.
patent: 5075587 (1991-12-01), Pabst et al.
Patent Abstract of Japan, Unexamined Applications, E. Field, Band 8, No. , Jun. 8, 1984, The Patent Office Japanese Government, Seite 70 E 249; & JP-A-59 35 352 (Mitsubishi).

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