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US 5,211,595 AGranted
Method of manufacturing an arc tube with offset press seals
AssigneeNorth American Philips Corporation
InventorsLou Kowalczyk, Bart van der Leeuw
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AssigneeNorth American Philips Corporation
InventorsLou Kowalczyk, Bart van der Leeuw
Estimating the term…
A method of producing a high pressure discharge lamp arc tube having discharge electrodes extending from respective press seals into opposing end chambers of continuously reducing cross-section. The press seals are positioned offset from the axis of the arc tube in a direction normal to their plane by positioning the lead-through and discharge electrode within the end portion of a length of tube of vitreous material offset from the tube axis by a predetermined distance, heating the end portion of the tube to its softening temperature, and moving opposing press jaws against said end portion in such a manner that the press seal is formed about said lead-through offset in a direction normal to the plane of the press seal and away from the tip-off. The press jaws may include mold portions for accurately forming the end chambers. During pressing, the tube is pressurized with a gas to blow mold the end chambers in the mold portions.
A method of manufacturing a high pressure discharge lamp arc tube having press seals at each end thereof and end chambers into which respective discharge electrodes extend, said method including the steps of providing a length of tubing of vitreous material having a longitudinal tube axis, providing a conductive lead-through connected to a discharge electrode, positioning said lead-through and discharge electrode with respect to an end portion of said tube, softening said end portion by heating, and pressing said end portion with opposing press jaws to form a generally planar press seal about said lead-through, wherein the improvement comprises:
Dependencies are inferred from the claim text.