ELECTRIC INCANDESCENT LAMP FOR VEHICLE HEADLIGHTS WITH NEW FILAMENT GEOMETRY

摘要

A filament coil (100) for an incandescent lamp assembly is provided. The filament coil includes a helical winding extending generally along a longitudinal axis (102) between a first end (104) and a second end (106). The filament coil further includes a winding having a first pitch ratio h/d at the first and second ends, and a different, second pitch ratio along an intermediate portion (108) located between the first and second ends.