Incandescent lamp

Details Incandescent lamp Incandescent lamp

1989-12-11

1991-04-09

Oshea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313318, 313273, 313634, 439612, 439619, H01J 1718, H01J 550, H01K 142

Patent

active

050067575

ABSTRACT:
An incandescent lamp comprises a glass envelope, a filament supported by constricted portions of the glass envelope, lead rods extending from both ends of the filament, tapered constricted portions at both ends of the glass tube to provide sealing portions by which the lead rods are surrounded respectively, and contacts connected to the outer ends of the lead rods respectively. The sealing ports are formed in such a manner that their outer diameters are equal to or smaller than those of the respective contacts, cylindrical bases are arranged so as to enclose the respective contacts, portions of the lead rods which project out of the sealing portions, and the sealing portions, and to be in contact with the respective tapered portions following the sealing portions, and fixing cement is filled in the bases. As a result of this construction, it is possible to shorten the length of the sealing portions so as to make the effective emission length of the incandescent lamp sufficiently long and to hold it stably without any breaks of the sealing portions.

REFERENCES:
patent: 1158928 (1915-11-01), Keyes
patent: 3870393 (1975-03-01), Hill
patent: 3983441 (1976-09-01), Northrup
patent: 4825125 (1989-04-01), Lagushenko et al.

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