Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1994-08-18
1996-05-07
O'Shea, Sandra L.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313113, 313488, H01J 6135
Patent
active
055149324
ABSTRACT:
A low-pressure mercury vapor discharge lamp having a discharge vessel which is sealed in a gastight manner and encloses a discharge space which contains a filling of mercury and rare gas and in which an electric discharge is maintained. A portion of a surface of the discharge vessel facing the discharge space has a reflector layer of aluminum oxide particles which includes a comparatively great porportional weight of larger particles with a median diameter of 0.25 to 0.80 .mu.m and a comparatively small proportional weight of smaller aluminum oxide particles with a median diameter of 0.01 to 0.02 .mu.m, which smaller particles are present dispersed among the larger particles. The product of the median of the overall particle size distribution and the specific surface of all particles taken together is at least 4.times.10.sup.-3 m.sup.3 /kg. As a result, the lamp has a comparatively high luminous efficacy.
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Hiemenz, "Principles of Colloid and Surface Chemistry", Chapters 8.6-8.9, pp. 322-335, 1977.
Johannes Baaten P. M.
Willibrordus Punt F. J.
O'Shea Sandra L.
Patel Ashok
U.S. Philips Corporation
Wieghaus Brian J.
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