Gas-filled shroud to provide cooler arctube

Details Gas-filled shroud to provide cooler arctube Gas-filled shroud to provide cooler arctube

2009-09-29

2011-11-01

Hines, Anne (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S036000, C313S635000

Reexamination Certificate

active

08049425

ABSTRACT:
A lamp is provided having an arctube having a light-transmitting envelope. The arctube is surrounded by a gaseous medium confined by a containment envelope such as a hermetic shroud. The gaseous medium is preferably He or H2or Ne or another gas whose thermal conductivity is greater than that of N2at 800° C., or a mixture thereof, to help cool the arctube. The inside and/or outside of the shroud may be coated with a diffusion barrier. To help cool the hot spot of the arctube the gap between the shroud and the envelope can be made small, the portion of the shroud wall near the arc can be thickened, the arctube can be offset above the longitudinal axis of the shroud, and the return lead of the arctube can be located between the shroud and the arctube.

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Applicant provides the following information. General Electric Company sold in the United States before Sep. 1, 2004 a lamp comprising an arctube having a ceramic light-transmitting envelope, the arctube being surrounded by nitrogen gas confined by a shroud, the light-transmitting envelope having an outside diameter of 8.9 mm, the shroud having an inside diameter of 12.1 mm, an outside diameter of 14.5 mm, and a wall thickness of 1.2 mm, the gap between the outside surface of the light-transmitting envelope and the inside surface of the shroud being 1.6 mm.

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