Dual-envelope high-pressure discharge lamp construction, and method of

Abstract

To facilitate manufacture of a high-pressure discharge lamp in which a double-ended discharge vessel is located within an outer, essentially rotation-symmetrical bulb (1), the holder structure for the discharge vessel is formed of first and second punched sheet-metal elements (12a, 12b; 20, 21) which define surface planes, and are electrically separate from each other. A first punched sheet-metal (12a, 20) is electrically connected to a first current supply lead (7a) from the discharge vessel and a first current connector (11a) extending from the base. A second punched sheet-metal element (12b, 21) is electrically connected to the second current supply lead (7b) and the second current connector (11b, 11b') extending from the base. Both punched sheet-metal elements are located essentially in a central plane, and extend essentially perpendicularly with respect to the lamp axis (I--I). The upper one of the punched sheet-metal elements can be formed with an extending tab or blade, terminating in a holding ring which surrounds an inwardly extending projection formed in the dome of the discharge vessel. The punched sheet-metal elements (12a, 12b; 20, 21) are parts of a two-part frame, severed from a unitary frame (10, 10') which, with the current supply leads (7a, 7b) and a protective quartz-glass tube and centering strips therefor--if used--forms a stable subassembly for welding to the current connectors.