Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1995-08-18
1996-11-05
Snow, Walter E.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
H01J 1704
Patent
active
055720900
ABSTRACT:
An incandescent lamp and method of making includes the placement of a hollow annular glass cylindrical insert within the glass envelope before fusing of the envelope to the bead takes place. The cylindrical insert is preferably made of an alumino silicate glass which has melting temperature about 200.degree. C. higher than the melting temperature of the glass from which the glass envelope is made. The shaping and length of the hollow annular glass cylinder may be made to accommodate the shaping of the lens portion of the glass envelope. The higher melting temperature of the hollow annular glass cylinder will enable it to provide support to the glass envelope during the fusing process. The hollow annular glass cylinder will not enable the glass envelope to tilt to one side or the other, or to become compressed, bringing the lens portion closer to the filament, especially during the fusing operation when the final lamp is formed. With this device and method, waste in the high intensity lamp industry can be virtually eliminated.
REFERENCES:
patent: 3121185 (1964-02-01), Poels et al.
patent: 4340841 (1982-07-01), Schupp
patent: 4584502 (1986-04-01), Kiesling et al.
Harrington Curtis L.
Haynes Mark
Snow Walter E.
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