EP 0219861 B1 19910918 - PROCESS FOR MANUFACTURING A METAL HALIDE HIGH-PRESSURE DISCHARGE LAMP HAVING A SINGLE PINCH, AND A LAMP MANUFACTURED ACCORDING TO THIS PROCESS
Title (en)
PROCESS FOR MANUFACTURING A METAL HALIDE HIGH-PRESSURE DISCHARGE LAMP HAVING A SINGLE PINCH, AND A LAMP MANUFACTURED ACCORDING TO THIS PROCESS
Publication
Application
Priority
- DE 3537879 A 19851024
- DE 3537880 A 19851024
Abstract (en)
[origin: US4723092A] To improve the high-voltage flash-over resistance by increasing the lead separation of the lamps, the pinch or press seal is, while the lamp is being made and the lamp tubing is in plastically deformable condition, extended at least is the region adjacent the end of the later formed pinch seal by introducing spreader jaws, either parallel or, at least eventually, in acutely angled relation to each other into the softened end portion, and then spreading apart the jaws so that, at the outer end portions of the jaws, the plastically deformable region will assume an oval shape whose longer dimension is wider than the outer diameter of the tubing in the region which will later from the discharge vessel.
IPC 1-7
IPC 8 full level
H01J 9/32 (2006.01); H01J 61/36 (2006.01)
CPC (source: EP US)
H01J 9/326 (2013.01 - EP US); H01J 61/368 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0219861 A2 19870429; EP 0219861 A3 19890503; EP 0219861 B1 19910918; DE 3681549 D1 19911024; JP H0656737 B2 19940727; JP S62100931 A 19870511; US 4723092 A 19880202
DOCDB simple family (application)
EP 86114649 A 19861022; DE 3681549 T 19861022; JP 25214686 A 19861024; US 91571386 A 19861006