Abstract: A low pressure arc discharge lamp with an end-of-life structure is described. The lamp has a discharge tube with sealed ends, and the sealed ends contain a filament for forming a discharge arc. The filament is supported by lead-in wires. The discharge lamp further comprises a connecting element made of an insulating material which transversely connects the lead-in wires within the discharge tube. The transverse dimension of the connecting element is chosen so as not to allow the discharge arc beyond the connecting element upon end-of-life of the discharge lamp.

Abstract: A fluorescent lamp comprises a discharge tube disposed substantially in a plane and shaped at least in part to define a substantial portion of the boundary of a zone in the plane. The part of the tube defining the boundary includes at least one straight portion. The discharge tube has a central axis and sealed ends provided with electrodes and at least two tube sections running substantially parallel to each other. Each tube section has at least one blind-sealed end and the tube sections are connected in series through bridges in the vicinity of the blind-sealed ends to define a single continuous discharge space to be excited by electrical power supplied to the electrodes. A lamp support housing is positioned within the zone and the ends of the discharge tube as well as the blind-sealed ends of the tube sections are re-entrant into the zone. The ends of the discharge tube are received in the lamp support housing.

Abstract: A low pressure arc discharge lamp with an end-of-life structure is disclosed. The lamp has a discharge tube with sealed ends, and the sealed ends contain a filament for forming a discharge arc. The filament is supported by lead-in wires. The discharge lamp further comprises a connecting element made of an insulating material which transversally connects the lead-in wires within the discharge tube. The transversal dimension of the connecting element is chosen so as not to allow the discharge arc beyond the connecting element upon end-of-life of the discharge lamp.

Abstract: The present invention relates to a low-pressure discharge lamp (1) including a discharge tube (20) and a base (5) providing for mechanical and electrical connection of the discharge lamp (1). The discharge tube (20) sealed in a gas-tight manner at its both ends is bent substantially in one plane so that the discharge tube (20) has straight (2) and arc-shaped portions (3), and the base (5) connected to the ends of the discharge tube (20) includes at least cathode leads of the discharge tube (20) and electrical connectors (15) connected to said leads. At least one component ensuring mechanical connection to a lampholder is formed on the base (5). The components of the discharge lamp (1) ensuring mechanical connection to the lampholder (16) are placed in a space bordered by the discharge tube (20).

Abstract: A discharge lamp comprises a discharge tube having discharge electrodes (10) at both ends thereof. Two lead wires (8) are connected to each of said electrodes (10) that lead to the outside atmosphere from the inside of the discharge tube. The discharge tube contains a fill as an arc discharge generating and sustaining medium. A tungsten coil (14) is connected to at least one lead wire (8) of at least one electrode (10) and placed adjacent to said electrode (10). At least one material selected from the group consisting of calcium carbonate, barium carbonate and strontium carbonate is applied to the inside and the surface of the tungsten coil (14).

Abstract: The invention relates to the discharge tube of a compact fluorescent lamp which discharge tube, being sealed hermetically and provided with appropriate fill, comprises at least two tube portions connected with each other, and electrodes are placed at the ends of the first and last tube portions, and lead wires protrude through the glass wall of the discharge tube to the electrodes. The invention also relates to a method for closing at least one of the tube portions forming a part of the discharge tube of a compact fluorescent lamp. The essential feature of the discharge tube according to the invention is that at least one of these tube portions is closed by a curved surface having tangents which, starting from the axis of the tube portion and extending to the cylindrical wall thereof, make a monotonously decreasing angle with the axis of the tube portion.