Low-pressure mercury vapor discharge lamp

Details Low-pressure mercury vapor discharge lamp Low-pressure mercury vapor discharge lamp

1983-06-22

1985-10-01

Walsh, Donald P.

Illumination

Light source and modifier

Ionized gas or vapor light source

2523014R, 2523014P, 313483, F21K 200

Patent

active

045449970

ABSTRACT:
A low-pressure mercury vapor discharge lamp comprising a glass discharge envelope (1) in which during operation of the lamp a discharge is present and which contains mercury and a rare gas, at least a part of the inner wall of the discharge envelope being provided with a thin at least substantially homogeneous continuous transparent layer (4) which is resistent to the action of the discharge.
According to the invention, this transparent layer (4) contains an oxide of at least one of the groups comprising yttrium, scandium, lanthanum, gadolinium, ytterbium and lutetium.

REFERENCES:
patent: 4034257 (1977-07-01), Hoffman
patent: 4038203 (1977-07-01), Takahashi
patent: 4162232 (1979-07-01), Yale

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