| 摘要 |
<p>986,514. Electric incandescent lamps. GENERAL ELECTRIC CO. Jan. 30, 1964 [Jan. 30, 1963], No. 3986/64. Heading H1F. A method of manufacturing an electric incandescent lamp of the double-ended type having an elongated tubular envelope 1 of vitreous material containing an axially extending filament 4 connected at its ends to lead-in conductors 5, 6 sealed in the end portions of the envelope, comprises the steps of sealing one end of an exhaust tube 2 of vitreous material into a first end of the envelope, positioning a filament assembly, consisting of a filament attached at its ends to lead-in conductors, axially within the envelope so that a part of the lead-in conductor 5 projects beyond the first end of the envelope into the exhaust tube and a part of the lead-in conductor 6 projects beyond the second end of the envelope, hermetically sealing the second end of the envelope to the conductor 6, evacuating and filling the envelope with a desired atmosphere through the exhaust tube, hermetically sealing the first end of the envelope, and removing the part of the exhaust tube which projects outwardly from the sealed first end of the envelope. The envelope is filled with the desired atmosphere, for example argon containing a small quantity of iodine vapour, at room temperature to a pressure above that of the atmosphere, and during the sealing of the first end the envelope is cooled by immersing the second end in liquid nitrogen to reduce the internal pressure below that of the atmosphere. The completed lamp may contain gas at a pressure of 1400 mm. of mercury at 70‹ F.</p> |
