Incandescent lamp having hardglass envelope with internal barrier layer
AssigneeOsram Sylvania Inc.
InventorsMark D. Beschle, Erich J. Bockley, Peter R. Gagnon, Robert M. Griffin
Life of this patent
Estimating the term…
Abstract
An incandescent lamp having an envelope of hardglass. The envelope encloses a tungsten filament and contains a fill material including an inert fill gas and a halogen additive. A coating of silicon dioxide (i.e., silica) is disposed on a substantial portion of the internal surface of the envelope. The silicon dioxide coating prevents the halogen additive from combining with alkaline ions of the hardglass envelope.
Claims20
An incandescent lamp comprising:
- a hermetically sealed envelope of hardglass composed of a predetermined quantity of alkaline ions;
- a fill material including an inert fill gas and a halogen additive contained within said envelope;
- at least one tungsten filament sealed in said envelope and supported by lead-in wires;
- and
- a coating of silicon dioxide disposed on a portion of the internal surface of said envelope for preventing said halogen additive from combining with said alkaline ions of said envelope.
An incandescent lamp comprising:
- an outer envelope including a molded light-transmissive glass body enclosing a cavity,
- a hermetically sealed inner envelope of hardglass disposed within said cavity and composed of a predetermined quantity of alkaline ions;
- at least one tungsten filament sealed in said inner envelope;
- a fill material including an inert fill gas and a halogen additive contained within said inner envelope;
- a coating of silicon dioxide disposed on a portion of the internal surface of said inner envelope for preventing said halogen additive from combining with said alkaline ions of said inner envelope,
- a base disposed at one end of said outer envelope;
- and
- means for electrically connecting said tungsten filament to said base.
An incandescent lamp comprising:
- a reflector defining a cavity
- a hermetically sealed envelope of hardglass disposed within said cavity of said reflector, said envelope composed of a predetermined quantity of alkaline ions;
- a fill material including an inert fill gas and a halogen additive contained within said envelope;
- at least one tungsten filament sealed in said envelope;
- and
- a coating of silicon dioxide disposed on a portion of the internal surface of said envelope for preventing said halogen additive from combining with said alkaline ions of said envelope.
A lamp envelope for containing a halogen additive, said lamp envelope comprising:
- hardglass having an internal surface and composed of a predetermined amount of alkaline ions;
- and
- a coating of silicon dioxide disposed on a portion of said internal surface of hardglass for preventing the halogen additive from combining with the alkaline ions of the envelope.
Dependencies are inferred from the claim text.