Tungsten halogen lamp base
AssigneeGTE Products Corporation
InventorsClyde B. Kohl, John F. Ellis, Clair D. Stewart
Life of this patent
Estimating the term…
Abstract
A prefocused tungsten-halogen lamp including a vitreous envelope having a press-seal at one end thereof for receiving and supporting lead-in wires that in turn support a filament disposed in the envelope. The press-seal is received in an all ceramic base with a close fit with the sidewalls of the base, while leaving a void space under the press-seal that is filled with a sealing cement preferably injected into the void space through a hole in the ceramic base.
Claims13
A lamp comprising:
- a sealed envelope of vitreous material having a bulb portion and a press-seal at one end thereof;
- a pair of electrically conductive lead-in wires hermetically sealed through said press-seal in spaced-apart relationship to one another and extending externally of said envelope beyond said press-seal;
- a filament disposed in said bulb portion and electrically coupled to said lead-in wires;
- a ceramic base for supporting said press-seal of said envelope and including integral sidewall means and base wall means, said sidewall means defining an envelope accommodating cavity dimensioned to snugly receive at least a portion of said envelope press-seal therein, said envelope press-seal being snugly positioned in said ceramic base with a void space between said press-seal and said base wall means;
- a sealing cement disposed within said void space to secure said lamp in said base, wherein said press-seal portion enveloped by said base sidewall means is substantially free of sealing cement;
- and
- a sealing cement passage in said ceramic base communicating with said void space and through which the sealing cement is injected into said void space.
In combination, a pre-focused lamp and a lamp holder, said lamp comprising, a sealed envelope of vitreous material having a bulb portion and a press-seal at one end thereof, a pair of electrically conductive lead-in wires hermetically sealed through said press-seal and supporting a filament disposed in said bulb portion connected across the inner ends of said lead-in wires, a ceramic base for supporting said pressseal of said envelope and including integral sidewall and base wall means defining an envelope accommodating cavity dimensioned to snugly receive at least a portion of said envelope press-seal therein with said press-seal being positioned in said ceramic base with a void space under the press-seal filled with a sealing cement, wherein said press-seal portion enveloped by said base and sidewall means is substantially free of sealing cement, and a sealing cement passage in said ceramic base communicating with said void space and through which the sealing cement is injected into said void space, said lampholder having a socket dimensioned to receive said ceramic base with a close tolerance fit.
Dependencies are inferred from the claim text.