METHOD OF MANUFACTURING AN ELECTRIC INCANDESCENT LAMP HAVING A LONGER LIFETIME AND/OR A HIGHER LIGHT OUTPUT

摘要

The invention relates to a method of manufacturing a gas-filled electric incandescent lamp particularly a low-voltage incandescent lamp in which the wire diameter of the incandescent civil varies in different axial sections. The diameter of the tungsten wire is reduced at the end turns and is increased in the middle with the aid of a chemical cycle process either before or after mounting in the lamp in order to reduce the temperature differences between the turns in the middle and at the end of the coil during operation of the lamp at the prescribed operating voltage.