EP 0465083 A2 19920108 - Discharge lamp with surrounding shroud and method of making such lamp.
Title (en)
Discharge lamp with surrounding shroud and method of making such lamp.
Title (de)
Entladungslampe mit doppelwandigem Kolben und Verfahren zu deren Herstellung.
Title (fr)
Lampe à décharge avec récipients à doubles parvis et procédé pour la fabriquer.
Publication
Application
Priority
US 54457190 A 19900627
Abstract (en)
This discharge lamp includes (i) an inner envelope (12) of vitreous material comprising a bulbous portion (14) and two tubular portions (16, 18) extending from the bulbous portion and (ii) a tubular shroud (20) of vitreous material surrounding the bulbous portion and the two tubular portions. The lamp is made by the following method. A disk-shaped enlargement (30) is formed in at least one of the tubular portions by heating a localized region of the tubular portion to its softening point and then subjecting said localized region to a compressive force (i) that is abruptly applied along the length of the tubular portion and (ii) that drives the softened vitreous material radially outward into a disk formation. Then the tubular shroud is placed over the inner envelope so that each disk-shaped enlargement is positioned with its outer periphery closely adjacent the inner periphery of the surrounding tubular shroud. Then seals are formed between the outer peripheries of the disk-shaped enlargements and the surrounding shroud portions by heating each of the surrounding shroud portions to its softening point and collapsing it about the outer periphery of the associated disk-shaped enlargement. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 9/24 (2006.01); H01J 9/32 (2006.01); H01J 61/34 (2006.01)
CPC (source: EP)
H01J 9/323 (2013.01); H01J 61/34 (2013.01)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0465083 A2 19920108; EP 0465083 A3 19930120; CA 2042143 A1 19911228; JP H04229942 A 19920819; JP H0565978 B2 19930920
DOCDB simple family (application)
EP 91305715 A 19910625; CA 2042143 A 19910509; JP 17888191 A 19910625