Low-pressure mercury vapor discharge lamp having a folded tube

Details Low-pressure mercury vapor discharge lamp having a folded tube Low-pressure mercury vapor discharge lamp having a folded tube

1989-12-12

1991-10-08

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313493, 313609, H01J 162

Patent

active

050557386

ABSTRACT:
A low-pressure mercury vapor discharge lamp is composed of a glass tube which has a discharge passage having two end portions arranged in the same direction, a folded portion in the direction opposite the portions, a pair of electrodes provided between the portions and amalgam provided in an end portion and for controlling the mercury vapor pressure. The tube has a configuration such that a low temperature region is formed in an inner face of the tube adjacent to the folded portion when the lamp is turned on in the state where the folded portion is oriented in a direction where it is affected by gravity, whereas, the low temperature region is formed in an inner face of the tube other than the folded portion when the lamp is turned on in the state that the folded portion is oriented in a direction where it is not affected by gravity, at a room temperature.

REFERENCES:
patent: 4374340 (1983-02-01), Bouwknegt
patent: 4481442 (1984-11-01), Albrecht et al.
patent: 4530710 (1985-07-01), Dullea
patent: 4694215 (1987-09-01), Hofmann
patent: 4786841 (1988-11-01), Fohl et al.
"Patent Abstracts of Japan", vol. 12, No. 168 (E-611) [3015], May 1988.
J. Illum. Engng. Inst. Jpn., vol. 71, No. 1, 12/1987 (pp. 11-14).

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