North American Philips Corporation

Albert E Kowal

Ray G Gibson

The invention is a method of assembling an electric lamp having a canted arc tube. The invention permits the lamp to be assembled using a standard bulged tube outer envelope having an elongate neck portion of the type normally used for lamps in which the arc tube is mounted coaxially with the envelope axis. In the inventive method, a stem assembly having a pair of rigid conductors extending therefrom is first sealed in the open end of the neck portion in a gas-tight manner. The envelope is severed around its circumference in the region where the neck portion merges into the bulbous portion of the envelope. After the two portions are separated, a frame holding the arc tube is welded to the rigid inductors of the stem assembly with the arc tube positioned at the desired angle with respect to the lamp defined by the elongate neck portion. The two envelope portions are then resealed in a gas-tight manner and a lamp cap secured to the neck portion.

Method of assembling an electric lamp having a canted arc tube

A lamp stem having integral glass structure for controlling gas flow into the lamp outer envelope of an electric lamp during back-fill. The lamp stem having a protrusion adjacent the stem press through which a conduit connected to the exhaust tube extends with a curved profile. The end portion of the conduit extends in the direction of the stem skirt and defines an acute angle with the exhaust tube. The end portion is angled for directing the gas flow during back-fill away from coated portions of the lamp envelope in which the stem is sealed. The conduit may have a cross-sectional area which increases in the direction of the gas flow so that the conduit functions as a gas diffuser for reducing the velocity of the gas in addition to directing the gas flow in a desired direction. In an alternative embodiment, the conduit terminates adjacent the stem press. A glass portion integral with the stem extends over the conduit opening and has a concave surface facing the opening for deflecting the gas flow during back-fill away from portions of a lamp envelope having a coating. :

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Corning, NY, United States of America

Albert E Kowal