Lamp with centered electrode of in-lead and method of making...

Details Lamp with centered electrode of in-lead and method of making... Lamp with centered electrode of in-lead and method of making...

H - Electricity

01

J

H01J 61/36 (2006.01) H01J 9/32 (2006.01) H01J 61/10 (2006.01) H01J 61/70 (2006.01)

Patent

CA 2226827

An hermetically sealed arc tube 14 has a longitudinal axis 60 and contains therewithin an arc generating and sustaining medium, as is known. The ends of the arc tube 14 are sealed with press-seals 43. The seals comprise a substantially parallelepipodonal structure having oppositely disposed, planar sides 56 and 58. A molybdenum foil 50 is sealed in each of the press-seals and is substantially centrally located between the planar sides 56 and 58. An in-lead 52 is secured as by welding to an end of foil 50 and extends outwardly of the arc tube for electrical connection to a source and an electrode 46 is attached to the other end of foil 50 and projects into the arc chamber. A first rod-relief member 62 in the form of a projecting boss 64 isformed on one of the planar sides, for example, 58, and a second rod-relief member 66 in the form of a depression 68 is formed on the other of the planar sides, in this instance side 56. The rod-relief members cooperate to center the electrode on the longitudinal axis within a variance of < 1°.

Tube à arc (14) fermé hermétiquement comprenant un axe longitudinal (60) et contenant à l'intérieur un arc générant et maintenant un medium. Les extrémités du tube à arc (14) sont fermées hermétiquement avec des pincements (43). Ceux-ci ont une structure essentiellement parallélépipède composée de côtés planaires opposés (56, 58). Un feuillard de molybdène (50) est inséré de manière hermétique dans chaque pincement et est essentiellement centré entre les côtés planaires (56, 58). Une entrée de courant (52) est fixée par soudage à une extrémité du feuillard (50) et se prolonge à l'extérieur du tube pour un branchement électrique à une source. Une électrode (46) est fixée à l'autre extrémité du feuillard (50) et déborde dans le tube à arc. Un premier élément (62) en saillie (64) est formé sur un des côtés planaires, p. ex. (58), et un deuxième élément (66) en dépression (68) est formé sur l'autre côté planaire, en l'occurrence le côté (56). Les éléments coopèrent pour centrer l'électrode, à un angle inférieur à 1 degré, sur l'axe longitudinal.

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