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US 5,705,887 AGranted
Fluorescent lamp with end of life arc quenching structure
AssigneeOsram Sylvania Inc.
InventorJohn W. Shaffer
Life of this patent
Estimating the term…
Abstract
A fluorescent lamp is disclosed containing a deposit of a dried metal hydride-containing paste. The dried metal hydride-containing paste has a decomposition temperature higher than the temperature present during normal lamp operation. At the end of the lamp life, an increase in lamp temperature decomposes the metal hydride-containing paste and releases hydrogen within the lamp. The presence of hydrogen causes the lamp to extinguish passively without significant end heating or glass cracking.
Claims13
A fluorescent lamp comprising:
- a glass tube;
- an electrode at each end of said tube;
- each of said electrodes comprising a pair of lead wires extending through a glass bead and joined to a coil;
- and
- a deposit of dried metal hydride-containing paste disposed on said glass bead, said deposit having a decomposition temperature higher than temperatures within said tube during normal operation of said lamp.
2 more elements
A fluorescent lamp comprising:
- a glass tube;
- an electrode at each end of said tube;
- each of said electrodes comprising a pair of lead wires extending through a glass seal at an end of said tube and joined to a coil;
- and
- a deposit of dried metal hydride-containing paste disposed on said glass seal, said deposit having a decomposition temperature higher than temperatures within said tube during normal operation of said lamp.
2 more elements
Dependencies are inferred from the claim text.