LAMP FUSE IN PRESS SEAL CAVITY

摘要

A lamp (10), such as a rapid thermal processing (“RTP) lamp, is sealed with a press seal (30) that contains a fuse (40). A relatively long press seal region is used that accommodates, in addition to the conventional filament leads to the exterior of the lamp, the fuse as well, the fuse (40) being disposed inside an inert-gas filled void (34) which is formed in the press seal (30), the fuse being thus disposed in an inert environment, such as nitrogen. The void (34) is defined by a bubble (36) formed in the press seal. Alternatively, the void (34) can be defined by an inside region of a glass capillary tube (42) that jackets the fuse and is squeezed into the press seal.

主权项

1. A lamp with an internally pressed fuse comprising:
an envelope (12) having an internal surface (14) defining a first enclosed volume (16), and having a press seal (30); and a filament (18) disposed in said first enclosed volume, an inner lead (24) extending from a first end (20) of the filament (18) into the press seal (30) electrically coupled in series to a fuse (40) pressed in the press seal (30), the fuse (40) being electrically coupled in series to a first external lead (32) extending from the press seal (30) to an exterior of the lamp, the filament (18) being further connected through a second filament end (22) to the exterior of the lamp for electrical connection, wherein said press seal (30) further has an inner press seal surface (35; 44) defining a press seal internal volume (34) containing a non-oxidizing atmosphere, said fuse (40) being disposed in said press seal internal volume (34).