Abstract:
An apparatus for welding the base pins of a fluorescent lamp, comprising two pairs of electrode holders disposed along the direction of advancement of said fluorescent lamp with a predetermined distance therebetween and removably holding welding electrodes, a first switch connected to the welding electrodes held by one pair of the two pairs of said electrode holders, a second switch connected to the welding electrodes held by the other pair of the two pairs of said electrode holders, and a switch control connected to the first and second switches, the apparatus being characterized in that the switching operations of the first and second switches are staggered in time by the switch control means in relation to the stepwise movement of the fluorescent lamp.
Abstract:
Lead-in wires for a lamp are beaded together by providing an offset in at least one of the wires, placing a ring of glass around the wires and letting it rest on the offset, and heating the glass so that it forms a bead for holding the wires in mutual relationship. A glass sleeve may be placed around one of the wires so as to rest on top of the glass ring prior to the steps of heating, resulting in an integral set of beaded wires of which one wire is sleeved above the bead.
Abstract:
A SMOOTH CONDUCTIVE LAYER OF POOT REFLECTIVITY ON AN INSULATING SURFACE IN OBTAINED BY FIRST APPLYING A CHROMINUM NICKEL LAYER WHICH IS OXIDIZED BY HEATING IN IS APPLIED A NICKEL LAYER WHICH IS OXIDIZED BY HEATING IN AIR AT 250* CTO500*C.
Abstract:
Lamps operating at high temperatures, and more particularly incandescent or arc lamps having sealed-in lead-in electrical conductors with improved service characteristics and longer service life are fabricated with a ''''coating'''' on the aforesaid leads comprising at least one of the following: a phosphate or phosphide of tungsten, or a phosphate or phosphide of molybdenum. Illustrative of the results obtained upon service testing 400-W, 120-V quartz-iodine lamps, at operating temperatures of 500*600* C., using A. untreated, uncoated, molybdenum electrode assemblies, B. platinum-clad, molybdenum electrode assemblies (exemplary of the prior-art techniques), and C. tungsten phosphate-coated molybdenum electrode assemblies, ARE AS FOLLOWS: A. failed through oxidation and subsequent disintegration, with accompanying seal and lamp failure at 100 hours'' operation, B. failed at approximately 150 hours of life testing, C. was still operating on a life test after 200 hours. Processes for forming metal phosphides from metal phosphates and process for coating leads with refractory metal phosphates and phosphides are also disclosed.