Patent ID: 6720718
Filing Date: 2004-04-13
Classification: H01K

Abstract:
An incandescent lamp comprising:a) a sealed, light transmissive tungsten halogen capsule receiving electrical power through a first lead and a second lead; b) at least one of the leads being coupled in series with an oxidizable electrical connection having a first pyrophoric stage ignitable at a first temperature and a second pyrophoric stage ignitable at a second temperature higher than the first temperature, the first pyrophoric stage positioned sufficiently near the second pyrophoric stage to transmit sufficient heat from the first pyrophoric stage during pyrophoric ignition to the second stage to cause ignition of the second stage; and c) a sealed light transmissive outer envelope enclosing the capsule, the oxidizable connection and an inert atmosphere around the connection, and providing electrical connection for the tungsten halogen capsule and wherein the second pyrophoric stage is a zirconium wire.