Electrodeless low-pressure mercury vapour discharge lamp employi

Details Electrodeless low-pressure mercury vapour discharge lamp employi Electrodeless low-pressure mercury vapour discharge lamp employi

1997-02-03

2000-04-18

Patidar, Jay

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313161, H01J 162

Patent

active

060519223

ABSTRACT:
An electrodeless low-pressure mercury vapor discharge lamp includes a discharge vessel that gas-tightly encloses a discharge-space that is provided with a fill of mercury and a noble gas. The discharge vessel has a light-transmitting enveloping part and further has a sunken part in which a coil for generating a high-frequency magnetic field is arranged. At least a portion of a surface of the discharge vessel turned towards the discharge space is provided with a luminescent layer. At least a portion of the luminescent layer bears a protective layer of aluminum oxide particles with a covering weight of 10 to 500 .mu.g/cm.sup.2. The protective layer provides for a lower mercury consumption and/or a reduction in the change of colour point during lamp life.

REFERENCES:
patent: 3886396 (1975-05-01), Hammer et al.
patent: 4079288 (1978-03-01), Maloney et al.
patent: 4117378 (1978-09-01), Glascock, Jr.
patent: 4639637 (1987-01-01), Taubner et al.
patent: 4922157 (1990-05-01), Van Engen et al.
patent: 4927217 (1990-05-01), Kroes et al.
patent: 5148085 (1992-09-01), Kroes
"New Insights in Chromaticity and Tolerance Areas of Fluorescent lamps", by J.J. Opstelten et al, Journal of Illuminating Engineering Society, Winter 1987, pp. 117-127.

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