Linear filament assembly with refractory insulating support rod for halogen lamp
AssigneeThorn EMI plc
InventorsAnthony W. Bollon, Christopher J. Clark
Life of this patent
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Abstract
A linear filament assembly for a halogen cycle incandescent lamp comprises a generally linear filament (usually a coil or coiled coil) supported at opposite ends by substantially rigid conductive leads, a rigid insulating rod, for example of quartz, extending generally parallel to the filament, and a plurality of supports extending between the rod and the filament, each support being fixedly secured to the rod, for example by having a coil part fitting over the rod and also being formed with a coil loosely exbracing the filament. The coils embracing the filament preferably include several closely spaced turns which loosely embrace part of the filament coil, without screwing into or engaging individual pitches of the latter.
Claims11
A linear filament assembly for a halogen cycle incandescent lamp, the assembly including:
- a generally linear coiled filament;
- respective conductive filament supports secured to the ends of the filament;
- respective metal foil elements secured to the filament supports;
- a refractory insulating rod extending alongside the filament coil;
- respective end supports connecting the ends of the rod to the metal foil elements;
- a plurality of wire supports spaced at intervals along the filament, each support wire being securely fixed to the rod and being formed with a coil of at least two turns of substantially the same diameter, the turns being sufficiently close to support the filament coil, wherein the pitch and diameter of the coil part are such that it loosely embraces and supports the filament coil without meshing therewith.
Dependencies are inferred from the claim text.